JP6038951B2 - Photosensitive resin composition, method for producing cured film, cured film, organic EL display device and liquid crystal display device - Google Patents

Description

  The present invention relates to a photosensitive resin composition (hereinafter sometimes simply referred to as “the composition of the present invention”). Moreover, it is related with the manufacturing method of the cured film using the said photosensitive resin composition, the cured film formed by hardening | curing the photosensitive composition, and various image display apparatuses using the said cured film. More specifically, a photosensitive resin composition suitable for forming a planarizing film, a protective film, and an interlayer insulating film of an electronic component such as a liquid crystal display device, an organic EL display device, an integrated circuit element, and a solid-state imaging device, and the same The present invention relates to a method for producing a cured film.

In an electronic component such as a thin film transistor (hereinafter referred to as “TFT”) type liquid crystal display element, magnetic head element, integrated circuit element, solid-state imaging element, etc., an interlayer insulation is generally used to insulate between wirings arranged in layers A membrane is provided. As a material for forming the interlayer insulating film, a material having a small number of steps for obtaining a required pattern shape and sufficient flatness is preferable. Therefore, photosensitive resin compositions are widely used. As such a photosensitive resin composition, what was disclosed by patent document 1 is mentioned, for example.
On the other hand, Patent Document 2 discloses a thermosetting resin composition using a copolymer having a structural unit derived from a conjugated diolefin unsaturated compound.

JP 2011-209681 A JP-A-6-157716

In recent years, in the field of electronic materials, with the progress of higher integration, more functions, and higher performance, circuit resistance and capacitor capacity between wirings have increased, leading to an increase in power consumption and delay time. In particular, the increase in delay time is a major factor in reducing the signal speed of the device and the occurrence of crosstalk. Therefore, in order to reduce the delay time and increase the speed of the device, it is required to reduce the parasitic capacitance. . In order to reduce the parasitic capacitance, there is an increasing demand for a low dielectric constant of the interlayer insulating film. In addition, if the hygroscopicity is high, the physical properties may change and the insulating properties may be inferior.
On the other hand, Patent Document 1 and Patent Document 2 do not disclose anything about low dielectric constant and low hygroscopicity. Further, the composition disclosed in Patent Document 2 is a thermosetting resin composition and cannot be used as a chemically amplified resist material.

  The present invention has been made in view of the above circumstances, and provides a photosensitive resin composition capable of obtaining a cured film having a low dielectric constant and low hygroscopicity while maintaining high sensitivity. Objective. Furthermore, it aims at providing the manufacturing method of a cured film using this photosensitive resin composition, a cured film, an organic electroluminescence display, and a liquid crystal display device.

As a result of intensive studies by the present inventors under such circumstances, high sensitivity is maintained by incorporating a polymer having a low-polarization and low-dielectric-constant hydrocarbon structural unit as a main component in the photosensitive resin composition. However, the inventors have found that a cured film having a low dielectric constant and low hygroscopicity can be obtained, and the present invention has been completed.
Specifically, the above problem has been solved by the following means <1>, preferably by <2> to <12>.
<1> (A) a polymer component containing a polymer that satisfies at least one of the following (A1) and (A2);
(A1) (a1) a polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a structural unit represented by the following general formula (S):
(A2) (a1) a polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a polymer having a structural unit represented by the following general formula (S):
A photosensitive resin composition containing (B) a photoacid generator and (C) a solvent.
(In formula (S), R ¹ and R ² each represent a hydrogen atom, an unsubstituted alkyl group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.)
<2> The photosensitive resin composition according to <1>, wherein the component (A) contains a structural unit having (a2) a crosslinkable group.
<3> The photosensitive resin composition according to <1> or <2>, wherein the proportion of (a4) in the component (A) is 5 to 70 mol%.
<4> The photosensitive resin composition according to <3>, wherein the proportion of (a4) in the component (A) is 15 to 50 mol%.
<5> (a2) a group in which the structural unit having a crosslinkable group is represented by an epoxy group, an oxetanyl group, —NH—CH ₂ —O—R (R is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms). The photosensitive resin composition in any one of <2>-<4> containing the structural unit containing at least 1 selected from the group which consists of an ethylenically unsaturated group.
<6> The photoacid generator (B) is an oxime sulfonate acid generator represented by any one of the following general formulas (B2), (B3), and (B4). The photosensitive resin composition in any one.
General formula (B2)
(In the formula (B2), R ⁴² represents an alkyl group or an aryl group, X represents an alkyl group, an alkoxy group, or a halogen atom, m4 represents an integer of 0 to 3, and m4 represents 2 or When X is 3, the plurality of X may be the same or different.)
General formula (B3)
(In the formula (B3), R ⁴³ represents an alkyl group or an aryl group, and X ¹ represents a halogen atom, a hydroxyl group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group. Represents a group, and n4 represents an integer of 0 to 5.)
(In Formula (B4), R ¹ represents an alkyl group or an aryl group, R ² represents an alkyl group, an aryl group, or a heteroaryl group. R ^{3 to} R ⁶ represent a hydrogen atom or an alkyl group, respectively. Represents an aryl group or a halogen atom, provided that R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ may combine to form an alicyclic ring or aromatic ring, and X represents —O -Represents -S-)
<7> Any one of <1> to <6> having a structural unit represented by the following general formula (a1-1-3) as a structural unit having a residue protected with an acid-decomposable group A photosensitive resin composition according to claim 1.
General formula (a1-1-3)
(In formula (a1-1-3), R ¹²¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, L ¹ represents a carbonyl group or a phenylene group, and R ^{122 to} R ¹²⁸ each represents a hydrogen atom or Represents an alkyl group having 1 to 4 carbon atoms.)
<8> (1) The process of apply | coating the photosensitive resin composition in any one of <1>-<7> on a board | substrate,
(2) a step of removing the solvent from the applied photosensitive resin composition;
(3) A step of exposing the photosensitive resin composition from which the solvent has been removed with actinic rays,
(4) a step of developing the exposed photosensitive resin composition with an aqueous developer, and
(5) A method for producing a cured film, comprising a post-baking step of thermosetting the developed photosensitive resin composition.
<9> The method for producing a cured film according to <8>, including a step of exposing the entire surface of the developed photosensitive resin composition after the step of developing and before the post-baking step.
<10> A cured film formed by the method for producing a cured film according to <8> or <9>.
<11> The cured film according to <10>, which is an interlayer insulating film.
<12> An organic EL display device or a liquid crystal display device having the cured film according to <10> or <11>.

  According to the present invention, it is possible to provide a photosensitive resin composition capable of obtaining a cured film having a low dielectric constant and low hygroscopicity while maintaining high sensitivity.

1 shows a conceptual diagram of a configuration of an example of an organic EL display device. A schematic cross-sectional view of a substrate in a bottom emission type organic EL display device is shown, and a planarizing film 4 is provided. 1 is a conceptual diagram of a configuration of an example of a liquid crystal display device. The schematic sectional drawing of the active matrix substrate in a liquid crystal display device is shown, and it has the cured film 17 which is an interlayer insulation film.

Hereinafter, the contents of the present invention will be described in detail. The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
In addition, in the description of group (atomic group) in this specification, the description which does not describe substitution and non-substitution includes what has a substituent with what does not have a substituent. For example, the “alkyl group” includes not only an alkyl group having no substituent (unsubstituted alkyl group) but also an alkyl group having a substituent (substituted alkyl group).

The photosensitive resin composition of the present invention (hereinafter sometimes referred to as “the composition of the present invention”) is (A) a polymer component containing a polymer that satisfies at least one of the following (A1) and (A2): (B) contains a photoacid generator and (C) a solvent.
Hereinafter, preferred embodiments of the composition of the present invention will be described in detail.

<(A) Polymer component>
The composition of this invention contains the polymer which satisfy | fills at least one of following (A1) and (A2) as a polymer component.
(A1) (a1) a polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a structural unit represented by the following general formula (S):
(A2) (a1) A polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a polymer having a structural unit represented by the following general formula (S).
(In formula (S), R ¹ and R ² each represent a hydrogen atom, an unsubstituted alkyl group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.)
Moreover, the composition of this invention may contain polymers other than these. The polymer component (A) in the present invention (hereinafter referred to as “component (A)”) is added as needed in addition to the above (A1) and / or (A2) unless otherwise specified. Including those polymers.

The component (A) is preferably an addition polymerization type resin, and more preferably a polymer containing a structural unit derived from (meth) acrylic acid and / or an ester thereof. In addition, you may have structural units other than the structural unit derived from (meth) acrylic acid and / or its ester, for example, the structural unit derived from styrene, the structural unit derived from a vinyl compound, etc.
The “structural unit derived from (meth) acrylic acid and / or its ester” is also referred to as “acrylic structural unit”. “(Meth) acrylic acid” means “methacrylic acid and / or acrylic acid”.

<< Structural Unit (a1) Structural Unit Having an Acid Group Protected with an Acid-Decomposable Group >>
Component A has (a1) at least a structural unit having a residue in which an acid group is protected with an acid-decomposable group. When the component (A) has the structural unit (a1), a highly sensitive photosensitive resin composition can be obtained.
As the “residue in which the acid group is protected with an acid-decomposable group” in the present invention, those known as an acid group and an acid-decomposable group can be used, and are not particularly limited. Specific examples of the acid group preferably include a carboxyl group and a phenolic hydroxyl group. The acid-decomposable group is a group that is relatively easily decomposed by an acid (for example, an acetal group such as an ester structure of a group represented by the formula (A1) described later, a tetrahydropyranyl ester group, or a tetrahydrofuranyl ester group). A functional group) or a group that is relatively difficult to be decomposed by an acid (for example, a tertiary alkyl group such as a tert-butyl ester group or a tertiary alkyl carbonate group such as a tert-butyl carbonate group).

(A1) The structural unit having a residue whose acid group is protected with an acid-decomposable group is a structural unit having a protected carboxyl group protected with an acid-decomposable group, or a protected phenol protected with an acid-decomposable group A structural unit having a functional hydroxyl group is preferred.
Hereinafter, the structural unit (a1-1) having a protected carboxyl group protected with an acid-decomposable group and the structural unit (a1-2) having a protected phenolic hydroxyl group protected with an acid-decomposable group will be described in this order. To do.

<<< (a1-1) Structural Unit Having a Protected Carboxyl Group Protected with an Acid-Decomposable Group >>>
The structural unit (a1-1) having a protected carboxyl group protected by an acid-decomposable group is a protected carboxyl in which the carboxyl group of the structural unit having a carboxyl group is protected by an acid-decomposable group described in detail below. A structural unit having a group.
There is no restriction | limiting in particular as a structural unit which has the said carboxyl group as a structural unit which can be used for the structural unit (a1-1) which has the protected carboxyl group protected by the said acid-decomposable group, A well-known structural unit can be used. For example, structural units (a1-1-1) derived from unsaturated carboxylic acids having at least one carboxyl group in the molecule, such as unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, and unsaturated tricarboxylic acids. It is done.
Hereinafter, the structural unit (a1-1-1) derived from an unsaturated carboxylic acid having at least one carboxyl group in the molecule and used as the structural unit having the carboxyl group will be described.

<<<<< (a1-1-1) Constituent Unit Derived from Unsaturated Carboxylic Acid Having at least One Carboxyl Group in the Molecule >>>>
Examples of the unsaturated carboxylic acid used in the present invention as the structural unit (a1-1-1) derived from an unsaturated carboxylic acid having at least one carboxyl group in the molecule include those listed below. . That is, examples of the unsaturated monocarboxylic acid include acrylic acid, methacrylic acid, crotonic acid, α-chloroacrylic acid, cinnamic acid, 2- (meth) acryloyloxyethyl-succinic acid, 2- (meth) acrylic acid. Examples include leuoxyethyl hexahydrophthalic acid and 2- (meth) acryloyloxyethyl-phthalic acid. Examples of the unsaturated dicarboxylic acid include maleic acid, fumaric acid, itaconic acid, citraconic acid, and mesaconic acid. Moreover, the acid anhydride may be sufficient as unsaturated polyhydric carboxylic acid used in order to obtain the structural unit which has a carboxyl group. Specific examples include maleic anhydride, itaconic anhydride, citraconic anhydride, and the like. The unsaturated polyvalent carboxylic acid may be a mono (2-methacryloyloxyalkyl) ester of a polyvalent carboxylic acid. For example, succinic acid mono (2-acryloyloxyethyl), succinic acid mono (2 -Methacryloyloxyethyl), mono (2-acryloyloxyethyl) phthalate, mono (2-methacryloyloxyethyl) phthalate and the like. Further, the unsaturated polyvalent carboxylic acid may be a mono (meth) acrylate of the dicarboxy polymer at both ends, and examples thereof include ω-carboxypolycaprolactone monoacrylate and ω-carboxypolycaprolactone monomethacrylate. As the unsaturated carboxylic acid, acrylic acid-2-carboxyethyl ester, methacrylic acid-2-carboxyethyl ester, maleic acid monoalkyl ester, fumaric acid monoalkyl ester, 4-carboxystyrene and the like can also be used.
Among these, from the viewpoint of developability, in order to form the structural unit (a1-1-1) derived from an unsaturated carboxylic acid having at least one carboxyl group in the molecule, acrylic acid, methacrylic acid, 2- (meth) acryloyloxyethyl-succinic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, 2- (meth) acryloyloxyethyl-phthalic acid, or unsaturated polyhydric carboxylic acid anhydride It is preferable to use acrylic acid, methacrylic acid, and 2- (meth) acryloyloxyethyl hexahydrophthalic acid.
The structural unit (a1-1-1) derived from an unsaturated carboxylic acid having at least one carboxyl group in the molecule may be composed of one kind alone, or composed of two or more kinds. May be.

<<<< acid-decomposable group that can be used for the structural unit (a1-1) >>>>
The acid-decomposable group described above can be used as the acid-decomposable group that can be used in the structural unit (a1-1) having a protected carboxyl group protected by the acid-decomposable group.
Among these acid-decomposable groups, it is a protected carboxyl group in which the carboxyl group is protected in the form of an acetal. It is preferable from the viewpoint of the storage stability of the composition. Furthermore, it is more preferable from a viewpoint of a sensitivity that a carboxyl group is a protected carboxyl group protected in the form of the acetal represented with the following general formula (a1-10) among acid-decomposable groups. In addition, when the carboxyl group is a protected carboxyl group protected in the form of an acetal represented by the following general formula (a1-10), the entire protected carboxyl group is — (C═O) —O—CR ^101. The structure is R ¹⁰² (OR ¹⁰³ ).

Formula (a1-1)
(In formula (a1-1), R ¹⁰¹ and R ¹⁰² each independently represents a hydrogen atom or an alkyl group, except that R ¹⁰¹ and R ¹⁰² are both hydrogen atoms. R ¹⁰³ is an alkyl group. R ¹⁰¹ or R ¹⁰² and R ¹⁰³ may be linked to form a cyclic ether.)

In the general formula (a1-1), R ^{101 to} R ¹⁰³ each independently represent a hydrogen atom or an alkyl group, and the alkyl group may be linear, branched, or cyclic. Here, both R ¹⁰¹ and R ¹⁰² do not represent a hydrogen atom, and at least one of R ¹⁰¹ and R ¹⁰² represents an alkyl group.

In the general formula (a1-1), when R ¹⁰¹ , R ¹⁰² and R ¹⁰³ represent an alkyl group, the alkyl group may be linear, branched or cyclic.
The linear or branched alkyl group preferably has 1 to 12 carbon atoms, more preferably 1 to 6 carbon atoms, and still more preferably 1 to 4 carbon atoms. Specifically, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, sec-butyl group, tert-butyl group, n-pentyl group, neopentyl group, n Examples include -hexyl group, texyl group (2,3-dimethyl-2-butyl group), n-heptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group, and n-decyl group.

  The cyclic alkyl group preferably has 3 to 12 carbon atoms, more preferably 4 to 8 carbon atoms, and still more preferably 4 to 6 carbon atoms. Examples of the cyclic alkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclooctyl group, a norbornyl group, and an isobornyl group.

The alkyl group may have a substituent, and examples of the substituent include a halogen atom, an aryl group, and an alkoxy group. When it has a halogen atom as a substituent, R ¹⁰¹ , R ¹⁰² and R ¹⁰³ become a haloalkyl group, and when it has an aryl group as a substituent, R ¹⁰¹ , R ¹⁰² and R ¹⁰³ become an aralkyl group.
Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, and among these, a fluorine atom or a chlorine atom is preferable.
Moreover, as said aryl group, a C6-C20 aryl group is preferable, More preferably, it is C6-C12, Specifically, a phenyl group, (alpha) -methylphenyl group, a naphthyl group etc. can be illustrated. Examples of the entire alkyl group substituted with an aryl group, that is, an aralkyl group, include a benzyl group, an α-methylbenzyl group, a phenethyl group, and a naphthylmethyl group.
As said alkoxy group, a C1-C6 alkoxy group is preferable, More preferably, it is C1-C4, and a methoxy group or an ethoxy group is more preferable.
Further, when the alkyl group is a cycloalkyl group, the cycloalkyl group may have a linear or branched alkyl group having 1 to 10 carbon atoms as a substituent, and the alkyl group is linear Or a branched alkyl group, it may have a cycloalkyl group having 3 to 12 carbon atoms as a substituent.
These substituents may be further substituted with the above substituents.

In the general formula (a1-1), when R ¹⁰¹ , R ¹⁰² and R ¹⁰³ represent an aryl group, the aryl group preferably has 6 to 12 carbon atoms, more preferably 6 to 10 carbon atoms. preferable. The aryl group may have a substituent, and preferred examples of the substituent include an alkyl group having 1 to 6 carbon atoms. Examples of the aryl group include a phenyl group, a tolyl group, a silyl group, a cumenyl group, and a 1-naphthyl group.

R ¹⁰¹ , R ¹⁰² and R ¹⁰³ can be bonded together to form a ring together with the carbon atom to which they are bonded. Examples of the ring structure when R ¹⁰¹ and R ¹⁰² , R ¹⁰¹ and R ^103, or R ¹⁰² and R ¹⁰³ are bonded include a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a tetrahydrofuranyl group, an adamantyl group, and a tetrahydropyrani group. And the like.

In the general formula (a1-1), it is preferable that any one of R ¹⁰¹ and R ¹⁰² is a hydrogen atom or a methyl group.

  As the radical polymerizable monomer used for forming the structural unit having a protected carboxyl group represented by the general formula (a1-1), a commercially available one may be used, or it may be synthesized by a known method. Things can also be used. For example, it can be synthesized by the synthesis method described in paragraph numbers 0037 to 0040 of JP2011-221494A.

A first preferred embodiment of the structural unit (a1-1) having a protected carboxyl group protected with the acid-decomposable group is a structural unit represented by the following general formula (a1-1-2).
Formula (a1-1-2)
(In formula (a1-1-2), R ¹ and R ² each represent a hydrogen atom, an alkyl group, or an aryl group, and at least ^one of R ¹ and R ² is an alkyl group or an aryl group, R ³ represents an alkyl group or an aryl group, and R ¹ or R ² and R ³ may be linked to form a cyclic ether, R ⁴ represents a hydrogen atom or a methyl group, and X represents a simple group. Represents a bond or an arylene group.)
When R ¹ and R ² are alkyl groups, an alkyl group having 1 to 10 carbon atoms is preferable. When R ¹ and R ² are aryl groups, a phenyl group is preferred. R ¹ and R ² are each preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
R ³ represents an alkyl group or an aryl group, preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 6 carbon atoms.
X represents a single bond or an arylene group, and a single bond is preferred.

A second preferred embodiment of the structural unit (a1-1) having a protected carboxyl group protected by the acid-decomposable group is a structural unit of the following general formula (a1-1-3).
General formula (a1-1-3)
(In formula (a1-1-3), R ¹²¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, L ¹ represents a carbonyl group or a phenylene group, and R ^{122 to} R ¹²⁸ each independently represents hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms.)
R ¹²¹ is preferably a hydrogen atom or a methyl group.
L ¹ is preferably a carbonyl group.
R ^{122 to} R ¹²⁸ are preferably a hydrogen atom.

  Preferable specific examples of the structural unit (a1-1) having a protected carboxyl group protected by the acid-decomposable group include the following structural units. R represents a hydrogen atom or a methyl group.

<<< (a1-2) Structural unit having a protected phenolic hydroxyl group protected with an acid-decomposable group >>>>
The structural unit (a1-2) having a protected phenolic hydroxyl group protected with an acid-decomposable group is a protected phenolic component in which the structural unit having a phenolic hydroxyl group is protected by an acid-decomposable group described in detail below. A structural unit having a hydroxyl group.

<<<< (a1-2-1) Structural unit having phenolic hydroxyl group >>>>
Examples of the structural unit having a phenolic hydroxyl group include a structural unit in a hydroxystyrene-based structural unit and a novolac-based resin, among these, a structural unit derived from hydroxystyrene or α-methylhydroxystyrene, It is preferable from the viewpoint of sensitivity. Moreover, as a structural unit having a phenolic hydroxyl group, a structural unit represented by the following general formula (a1-2) is also preferable from the viewpoint of sensitivity.

Formula (a1-2)
(In General Formula (a1-2), R ²²⁰ represents a hydrogen atom or a methyl group, R ²²¹ represents a single bond or a divalent linking group, and R ²²² represents a halogen atom or a straight chain having 1 to 5 carbon atoms or represents a branched alkyl group, a represents an integer of 1 to 5, b represents an integer of 0 to 4, a + b is 5 or less. in the case where R ²²² is present 2 or more, these R ²²² may be different from each other or the same.)

In the general formula (a1-2), R ²²⁰ represents a hydrogen atom or a methyl group, and is preferably a methyl group.
R ²²¹ represents a single bond or a divalent linking group. A single bond is preferable because the sensitivity can be improved and the transparency of the cured film can be further improved. The divalent linking group of R ²²¹ may be exemplified alkylene groups, specific examples R ²²¹ is an alkylene group, a methylene group, an ethylene group, a propylene group, isopropylene group, n- butylene group, isobutylene group, tert -Butylene group, pentylene group, isopentylene group, neopentylene group, hexylene group, etc. are mentioned. Among these, it is preferable that R ²²¹ is a single bond, a methylene group, or an ethylene group. The divalent linking group may have a substituent, and examples of the substituent include a halogen atom, a hydroxyl group, and an alkoxy group. Moreover, although a represents the integer of 1-5, from the viewpoint of the effect of this invention and the point that manufacture is easy, it is preferable that a is 1 or 2, and it is more preferable that a is 1. .
Further, the bonding position of the hydroxyl group in the benzene ring is preferably bonded to the 4-position when the carbon atom bonded to R ²²¹ is defined as the reference (first position).
R ²²² is a halogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms. Specifically, fluorine atom, chlorine atom, bromine atom, methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, isobutyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group and the like can be mentioned. It is done. Among these, a chlorine atom, a bromine atom, a methyl group, or an ethyl group is preferable from the viewpoint of easy production.
B represents 0 or an integer of 1 to 4;

<<<< acid-decomposable group that can be used for the structural unit (a1-2) >>>>
The acid-decomposable group that can be used for the structural unit (a1-2) having a protected phenolic hydroxyl group protected with the acid-decomposable group has a protected carboxyl group protected with the acid-decomposable group. Similarly to the acid-decomposable group that can be used for the unit (a1-1), known ones can be used and are not particularly limited. Among the acid-decomposable groups, a structural unit having a protected phenolic hydroxyl group protected with acetal is a basic physical property of the photosensitive resin composition, particularly sensitivity and pattern shape, storage stability of the photosensitive resin composition, contact This is preferable from the viewpoint of hole formability. Furthermore, among the acid-decomposable groups, the phenolic hydroxyl group is more preferably a protected phenolic hydroxyl group protected in the form of an acetal represented by the general formula (a1-1) from the viewpoint of sensitivity. In addition, when the phenolic hydroxyl group is a protected phenolic hydroxyl group protected in the form of the acetal represented by the general formula (a1-1), the whole of the protected phenolic hydroxyl group is -Ar-O-CR ¹⁰¹ R. The structure is ¹⁰² (OR ¹⁰³ ). Ar represents an arylene group.

Preferable examples of the acetal ester structure of the phenolic hydroxyl group include a combination of R ¹⁰¹ = R ¹⁰² = R ¹⁰³ = methyl group, R ¹⁰¹ = R ¹⁰² = methyl group and R ¹⁰³ = benzyl group.

Moreover, as a radically polymerizable monomer used for forming a structural unit having a protected phenolic hydroxyl group in which the phenolic hydroxyl group is protected in the form of acetal, for example, paragraph number 0042 of JP2011-215590A is disclosed. And the like.
Among these, a 1-alkoxyalkyl protector of 4-hydroxyphenyl methacrylate and a tetrahydropyranyl protector of 4-hydroxyphenyl methacrylate are preferable from the viewpoint of transparency.

  Specific examples of the acetal protecting group for the phenolic hydroxyl group include a 1-alkoxyalkyl group, such as a 1-ethoxyethyl group, a 1-methoxyethyl group, a 1-n-butoxyethyl group, and a 1-isobutoxyethyl group. 1- (2-chloroethoxy) ethyl group, 1- (2-ethylhexyloxy) ethyl group, 1-n-propoxyethyl group, 1-cyclohexyloxyethyl group, 1- (2-cyclohexylethoxy) ethyl group, 1 -A benzyloxyethyl group etc. can be mentioned, These can be used individually or in combination of 2 or more types.

  As the radical polymerizable monomer used for forming the structural unit (a1-2) having a protected phenolic hydroxyl group protected by the acid-decomposable group, a commercially available one may be used, or a known method may be used. What was synthesize | combined by can also be used. For example, it can be synthesized by reacting a compound having a phenolic hydroxyl group with vinyl ether in the presence of an acid catalyst. In the above synthesis, a monomer having a phenolic hydroxyl group may be previously copolymerized with another monomer, and then reacted with vinyl ether in the presence of an acid catalyst.

  Preferable specific examples of the structural unit (a1-2) having a protected phenolic hydroxyl group protected with the acid-decomposable group include the following structural units, but the present invention is not limited thereto.

<<< Preferred Aspect of Structural Unit (a1) >>>
When the polymer containing the structural unit (a1) does not substantially contain the structural unit (a2) described later, the structural unit (a1) is 20% in the polymer containing the structural unit (a1). -100 mol% is preferable and 30-90 mol% is more preferable.
When the polymer containing the structural unit (a1) contains the structural unit (a2), the structural unit (a1) has a sensitivity in the polymer containing the structural unit (a1) and the structural unit (a2). From the viewpoint of, 3-70 mol% is preferable, and 10-60 mol% is more preferable. In particular, when the acid-decomposable group that can be used in the structural unit (a1) is a structural unit having a protected carboxyl group in which the carboxyl group is protected in the form of an acetal, 20 to 50 mol% is preferable.

  The structural unit (a1-1) having a protected carboxyl group protected with the acid-decomposable group is more developed than the structural unit (a1-2) having a protected phenolic hydroxyl group protected with the acid-decomposable group. Is characterized by being fast. Therefore, the structural unit (a1-1) having a protected carboxyl group protected with an acid-decomposable group is preferred when developing quickly. Conversely, when it is desired to delay development, it is preferable to use the structural unit (a1-2) having a protected phenolic hydroxyl group protected with an acid-decomposable group.

<< (a2) Structural Unit Having Crosslinkable Group >>
The component (A) preferably has a structural unit (a2) having a crosslinkable group. The crosslinkable group is not particularly limited as long as it is a group that causes a curing reaction by heat treatment. As a preferred embodiment of the structural unit having a crosslinkable group, an epoxy group, an oxetanyl group, a group represented by —NH—CH ₂ —O—R (where R is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms) and ethylene And a structural unit containing at least one selected from the group consisting of an unsaturated group, an epoxy group, an oxetanyl group, and —NH—CH ₂ —O—R (R is a hydrogen atom or a carbon number of 1 to 20). The alkyl group is preferably at least one selected from the group represented by Among them, in the photosensitive resin composition of the present invention, the component (A) preferably includes a structural unit containing at least one of an epoxy group and an oxetanyl group. In more detail, the following are mentioned.

<<< (a2-1) Structural Unit Having Epoxy Group and / or Oxetanyl Group >>>
The (A) copolymer preferably contains a structural unit (structural unit (a2-1)) having an epoxy group and / or an oxetanyl group. A 3-membered cyclic ether group is also called an epoxy group, and a 4-membered cyclic ether group is also called an oxetanyl group.
The structural unit (a2-1) having an epoxy group and / or oxetanyl group only needs to have at least one epoxy group or oxetanyl group in one structural unit, one or more epoxy groups and one It may have an oxetanyl group, two or more epoxy groups, or two or more oxetanyl groups, and is not particularly limited, but preferably has a total of 1 to 3 epoxy groups and / or oxetanyl groups, It is more preferable to have one or two epoxy groups and / or oxetanyl groups in total, and it is even more preferable to have one epoxy group or oxetanyl group.

Specific examples of the radical polymerizable monomer used to form the structural unit having an epoxy group include, for example, glycidyl acrylate, glycidyl methacrylate, glycidyl α-ethyl acrylate, and glycidyl α-n-propyl acrylate. Glycidyl α-n-butyl acrylate, 3,4-epoxybutyl acrylate, 3,4-epoxybutyl methacrylate, 3,4-epoxycyclohexylmethyl acrylate, 3,4-epoxycyclohexyl methacrylate Methyl, α-ethylacrylic acid-3,4-epoxycyclohexylmethyl, o-vinylbenzyl glycidyl ether, m-vinylbenzyl glycidyl ether, p-vinylbenzyl glycidyl ether, described in paragraph Nos. 0031 to 0035 of Japanese Patent No. 4168443 Alicyclic And compounds containing epoxy backbone can be cited, the contents of which are incorporated herein.
Specific examples of the radical polymerizable monomer used for forming the structural unit having an oxetanyl group include (meth) having an oxetanyl group described in paragraph Nos. 0011 to 0016 of JP-A No. 2001-330953, for example. Acrylic acid esters and the like are mentioned, the contents of which are incorporated herein.
Specific examples of the radical polymerizable monomer used for forming the structural unit (a2-1) having the epoxy group and / or oxetanyl group include a monomer containing a methacrylate structure and an acrylate structure. It is preferable that it is a monomer to contain.

  Among these, preferred are glycidyl methacrylate, 3,4-epoxycyclohexylmethyl acrylate, 3,4-epoxycyclohexylmethyl methacrylate, (3-ethyloxetane-3-yl) methyl acrylate, and methacrylic acid ( 3-ethyloxetane-3-yl) methyl. These structural units can be used individually by 1 type or in combination of 2 or more types.

  Preferable specific examples of the structural unit (a2-1) having the epoxy group and / or oxetanyl group include the following structural units. R represents a hydrogen atom or a methyl group.

<<< (a2-2) Structural unit having an ethylenically unsaturated group >>>
One example of the structural unit (a2) having a crosslinkable group is a structural unit (a2-2) having an ethylenically unsaturated group (hereinafter also referred to as “structural unit (a2-2)”). The structural unit (a2-2) having an ethylenically unsaturated group is preferably a structural unit having an ethylenically unsaturated group in the side chain, having an ethylenically unsaturated group at the terminal, and having 3 to 16 carbon atoms. A structural unit having a side chain is more preferred, and a structural unit having a side chain represented by the following general formula (a2-2-1) is more preferred.

General formula (a2-2-1)
(In General Formula (a2-2-1), R ³⁰¹ represents a divalent linking group having 1 to 13 carbon atoms, R ³⁰² represents a hydrogen atom or a methyl group, and * represents a structural unit having a crosslinkable group ( It represents a site linked to the main chain of a2).

R ³⁰¹ is a divalent linking group having 1 to 13 carbon atoms and includes an alkenyl group, a cycloalkenyl group, an arylene group, or a combination of these, and includes an ester bond, an ether bond, an amide bond, a urethane bond, and the like. Bonds may be included. The divalent linking group may have a substituent such as a hydroxy group or a carboxyl group at an arbitrary position. Specific examples of R ³⁰¹ include the following divalent linking groups.

Among the side chains represented by the general formula (a2-2-1), an aliphatic side chain including the divalent linking group represented by the R ³⁰¹ is preferable.

  Others (a2-2) Regarding the structural unit having an ethylenically unsaturated group, the description of paragraph numbers 0072 to 0090 of JP2011-215580A can be referred to, and the contents thereof are incorporated in the present specification.

<<< constituent unit having a group represented by (a2-3) -NH-CH ₂ —O—R (where R is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms) >>
The copolymer used in the present invention is also preferably a structural unit (a2-3) having a group represented by —NH—CH ₂ —O—R (R is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms). By having the structural unit (a2-3), a curing reaction can be caused by a mild heat treatment, and a cured film having excellent characteristics can be obtained. Here, R is preferably an alkyl group having 1 to 9 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms. The alkyl group may be a linear, branched or cyclic alkyl group, but is preferably a linear or branched alkyl group. The structural unit (a2) is more preferably a structural unit having a group represented by the following general formula (a2-30).
Formula (a2-3)
(In general formula (a2-3), R ¹ represents a hydrogen atom or a methyl group, and R ² represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.)
R ² is preferably an alkyl group having 1 to 9 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms. The alkyl group may be a linear, branched or cyclic alkyl group, but is preferably a linear or branched alkyl group.
Specific examples of R ² include a methyl group, an ethyl group, an n-butyl group, an i-butyl group, a cyclohexyl group, and an n-hexyl group. Of these, i-butyl, n-butyl and methyl are preferred.

<<< Preferred Aspect of Structural Unit (a2) >>>
When the polymer containing the structural unit (a2) is substantially free of the structural unit (a1), the structural unit (a2) is 5 to 5 in the polymer containing the structural unit (a2). 90 mol% is preferable and 20-80 mol% is more preferable.
When the polymer containing the structural unit (a2) contains the structural unit (a1), the structural unit (a2) is a polymer containing the structural unit (a1) and the structural unit (a2). From the viewpoint of chemical resistance, 3-70 mol% is preferable, and 10-60 mol% is more preferable.
In this invention, it is preferable to contain 3-70 mol% of structural units (a2) in all the structural units of (A) component irrespective of any aspect, and it is more preferable to contain 10-60 mol%. preferable.
Within the above numerical range, the transparency and chemical resistance of the cured film obtained from the photosensitive resin composition will be good.

<< (a4) Constituent unit of conjugated olefin >>
In the present invention, the component (A) contains a hydrocarbon structural unit having a low polarization and a low dielectric constant, that is, a structural unit (a4) represented by the following general formula (S).
(In formula (S), R ¹ and R ² each represent a hydrogen atom, an unsubstituted alkyl group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.)

Examples of the unsubstituted alkyl group having 1 to 3 carbon atoms include a methyl group, an ethyl group, an n-propyl group, and an isopropyl group, and a methyl group is preferable from the viewpoint of reducing the dielectric constant.
Examples of the perfluoroalkyl group having 1 to 3 carbon atoms include —CF ₃ , —CF ₂ CF ₃ , —CF ₂ CF ₂ CF ₃ , and —CFCF ₃ CF _3. From the viewpoint of reducing the dielectric constant, —CF ₃ is preferable.

  The polymer having the structural unit (a4) is not particularly limited, and examples thereof include 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, and 2-trifluoro. It can be obtained using methyl-1,3-butadiene and 2,3-bis (trifluoromethyl) -1,3-butadiene.

The structural unit (a4) may be contained in the polymer component (A1) and / or (A2), but is preferably contained in the polymer component (A1). Further, for example, a polymer component having the structural unit (a1), the structural unit (a2) and the structural unit (a3) and a polymer component having the structural unit (a3) and the structural unit (a4) are used. May be.
Of all the structural units of the polymer component (A), the structural unit (a4) is preferably contained in an amount of 5 to 70 mol%, more preferably 15 to 50 mol%, and more preferably 20 to 40 mol%. Is more preferable. (A) By containing 5 mol% or more of the structural unit (a4) in all the structural units of the polymer component, a cured film having a lower dielectric constant and lower hygroscopicity can be obtained while maintaining high sensitivity. A photosensitive resin composition can be provided. Moreover, (A) By making 70 mol% or less of structural unit (a4) in all the structural units of a polymer component, when the photosensitive resin composition of this invention is used as a cured film, a cured film and a board | substrate. The adhesion between them can be improved. (A) Two or more types of structural units (a4) in the polymer component may be used in combination.

<< (a3) Other structural units >>
In the present invention, the component (A) may have another structural unit (a3) in addition to the structural units (a1), (a2), and (a4). These structural units may be contained in the polymer component (A1) and / or (A2). In addition to the polymer component (A1) and / or (A2), the polymer component having a structural unit (a3) substantially free of (a1), (a2) and (a4) It may be. In addition to the polymer component (A), when the polymer component having the structural unit (a3) is contained substantially without (a1), (a2) and (a4), the blending amount of the polymer component Is preferably 60% by mass or less, more preferably 40% by mass or less, and still more preferably 20% by mass or less in all polymer components.

  There is no restriction | limiting in particular as a monomer used as structural unit (a3), For example, styrenes, (meth) acrylic acid alkyl ester, (meth) acrylic acid cyclic alkyl ester, (meth) acrylic acid aryl ester, unsaturated dicarboxylic acid Examples include diesters, bicyclounsaturated compounds, maleimide compounds, unsaturated aromatic compounds, conjugated diene compounds, unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, unsaturated dicarboxylic acid anhydrides, and other unsaturated compounds. it can. Moreover, you may have the structural unit which has an acid group so that it may mention later. The monomer which becomes a structural unit (a3) can be used individually or in combination of 2 or more types.

  The structural unit (a3) is specifically styrene, tert-butoxystyrene, methylstyrene, hydroxystyrene, α-methylstyrene, acetoxystyrene, methoxystyrene, ethoxystyrene, chlorostyrene, methyl vinylbenzoate, vinylbenzoic acid. Ethyl, 4-hydroxybenzoic acid (3-methacryloyloxypropyl) ester, (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, (meth) acrylic acid Isopropyl, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, acrylonitrile, ethylene glycol monoacetoacetate mono (meth) acrylate Mention may be made of a structural unit due. In addition, compounds described in paragraph numbers 0021 to 0024 of JP-A No. 2004-264623 can be exemplified.

  Moreover, the group which has styrenes and an aliphatic cyclic skeleton as a structural unit (a3) is preferable from a viewpoint of an electrical property. Specifically, styrene, tert-butoxystyrene, methylstyrene, hydroxystyrene, α-methylstyrene, dicyclopentanyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, benzyl (meth) acrylate, etc. Can be mentioned.

  Furthermore, (meth) acrylic acid alkyl ester is preferable as the structural unit (a3) from the viewpoint of adhesion. Specific examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and n-butyl (meth) acrylate, and methyl (meth) acrylate is more preferable.

As the structural unit (a3), an acid group is preferably included. By containing an acid group, it becomes easy to dissolve in an alkaline developer, and the effects of the present invention are more effectively exhibited. The acid group in the present invention means a proton dissociable group having a pKa of less than 7. The acid group is usually incorporated into the polymer as a structural unit containing an acid group using a monomer capable of forming an acid group. By including such a structural unit containing an acid group in the polymer, the polymer tends to be easily dissolved in an alkaline developer.
Acid groups used in the present invention include those derived from carboxylic acid groups, those derived from sulfonamide groups, those derived from phosphonic acid groups, those derived from sulfonic acid groups, those derived from phenolic hydroxyl groups, sulfones Amide groups, sulfonylimide groups and the like are exemplified, and those derived from carboxylic acid groups and / or those derived from phenolic hydroxyl groups are preferred.
The structural unit containing an acid group used in the present invention is more preferably a structural unit derived from styrene, a structural unit derived from a vinyl compound, a structural unit derived from (meth) acrylic acid and / or an ester thereof. .

  As such a polymer, a resin having a carboxyl group in the side chain is preferable. For example, JP-A-59-44615, JP-B-54-34327, JP-B-58-12777, JP-B-54-25957, JP-A-59-53836, JP-A-59-71048 Methacrylic acid copolymer, acrylic acid copolymer, itaconic acid copolymer, crotonic acid copolymer, maleic acid copolymer, partially esterified maleic acid copolymer Examples thereof include acidic cellulose derivatives having a carboxyl group in the side chain, those obtained by adding an acid anhydride to a polymer having a hydroxyl group, and a polymer having a (meth) acryloyl group in the side chain is also preferred. It is mentioned as a thing.

For example, benzyl (meth) acrylate / (meth) acrylic acid copolymer, 2-hydroxyethyl (meth) acrylate / benzyl (meth) acrylate / (meth) acrylic acid copolymer, described in JP-A-7-140654 2-hydroxypropyl (meth) acrylate / polystyrene macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxy-3-phenoxypropyl acrylate / polymethyl methacrylate macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2 -Hydroxyethyl methacrylate / polystyrene macromonomer / methyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / benzyl methacrylate / methacrylic acid Copolymer and the like.
In addition, JP-A-7-207211, JP-A-8-259876, JP-A-10-300922, JP-A-11-140144, JP-A-11-174224, JP-A-2000-56118 Known polymer compounds described in JP-A-2003-233179, JP-A-2009-52020, and the like can be used, and the contents thereof are incorporated herein.
These polymers may contain only 1 type and may contain 2 or more types.

  SMA 1000P, SMA 2000P, SMA 3000P, SMA 1440F, SMA 17352P, SMA 2625P, SMA 3840F (above, manufactured by Sartomer), ARUFON UC-3000, ARUFON UC-3510, ARUFON are commercially available as these polymers. UC-3900, ARUFON UC-3910, ARUFON UC-3920, ARUFON UC-3080 (above, manufactured by Toagosei Co., Ltd.), Joncry 690, Joncry 678, Joncry 67, Joncry 586 (above, made by BASF) You can also.

  In the present invention, it is particularly preferable from the viewpoint of sensitivity to contain a structural unit having a carboxyl group or a structural unit having a phenolic hydroxyl group.

  The structural unit containing an acid group is preferably 1 to 80 mol%, more preferably 1 to 50 mol%, still more preferably 5 to 40 mol%, and particularly preferably 5 to 30 mol% of the structural units of all polymer components. 5 to 20 mol% is particularly preferable.

Although preferable embodiment of the (A) polymer component of this invention is given to the following, this invention is not limited to these.
(First embodiment)
A mode in which the polymer component (A1) has a structural unit (a2) and a structural unit (a3) in addition to the structural unit (a1) and the structural unit (a4).
(Second Embodiment)
As the polymer component (A2), a first polymer having a structural unit (a1), a structural unit (a2), and a structural unit (a3), a structural unit (a2), and a structural unit (a3) And a second polymer having the structural unit (a4).
(Third embodiment)
The aspect in which the polymer component (A1) further has one or more structural units (a3).
(Fourth embodiment)
The aspect which the polymer which has the structural unit (a1) of a polymer component (A2) further has 1 type, or 2 or more types of structural units (a3).
(Fifth embodiment)
The aspect which the polymer which has the structural unit (a2) of a polymer component (A2) further has 1 type, or 2 or more types of structural units (a3).
(Sixth embodiment)
In any one of 1st-5th embodiment, the aspect containing the structural unit which contains an acid group at least as a structural unit (a3).
(Seventh embodiment)
In addition to the polymer component (A1) or (A2), an embodiment having a polymer having the structural unit (a3) substantially not including the structural unit (a1) and the structural unit (a2).
(Eighth embodiment)
The form which consists of 2 or more combinations of 1st-7th embodiment.

Among all the structural units of the polymer component (A), the structural unit (a1), the structural unit (a2) (preferably an epoxy group, an oxetanyl group, —NH—CH ₂ —O—R (where R is a hydrogen atom or carbon A structural unit comprising at least one selected from the group consisting of a group represented by the formula (1-20) and an ethylenically unsaturated group), a structural unit (a3) (acid group), and a structural unit (a4) The total amount of is preferably 95 mol% or more, and more preferably 98 mol% or more.

<< (A) Molecular Weight of Polymer >>
(A) The molecular weight of a polymer is a polystyrene conversion weight average molecular weight, Preferably it is 1,000-200,000, More preferably, it is the range of 2,000-50,000. Various characteristics are favorable in the range of the said numerical value. The ratio (dispersity) between the number average molecular weight and the weight average molecular weight is preferably 1.0 to 5.0, more preferably 1.5 to 3.5.

<< (A) Polymer Production Method >>
Various methods for synthesizing the component (A) are known. To give an example, the component (A) is used to form at least the structural units represented by (a1) and (a4). It can be synthesized by polymerizing a radical polymerizable monomer mixture containing a radical polymerizable monomer in an organic solvent using a radical polymerization initiator. It can also be synthesized by a so-called polymer reaction.

<(B) Photoacid generator>
The photosensitive resin composition of the present invention contains (B) a photoacid generator. As the photoacid generator (also referred to as “component (B)”) used in the present invention, a compound that reacts with actinic rays having a wavelength of 300 nm or more, preferably 300 to 450 nm, and generates an acid is preferable. The chemical structure is not limited. Further, a photoacid generator that is not directly sensitive to an actinic ray having a wavelength of 300 nm or more can also be used as a sensitizer if it is a compound that reacts with an actinic ray having a wavelength of 300 nm or more and generates an acid when used in combination with a sensitizer. It can be preferably used in combination. The photoacid generator used in the present invention is preferably a photoacid generator that generates an acid having a pKa of 4 or less, more preferably a photoacid generator that generates an acid having a pKa of 3 or less, and an acid of 2 or less. Most preferred are photoacid generators that generate

  Examples of the photoacid generator include trichloromethyl-s-triazines, sulfonium salts and iodonium salts, quaternary ammonium salts, diazomethane compounds, imide sulfonate compounds, and oxime sulfonate compounds. Among these, it is preferable to use an oxime sulfonate compound from the viewpoint of insulation. These photoacid generators can be used singly or in combination of two or more. Specific examples of trichloromethyl-s-triazines, diaryliodonium salts, triarylsulfonium salts, quaternary ammonium salts, and diazomethane derivatives include the compounds described in paragraph numbers 0083 to 0088 of JP2011-221494A. These can be illustrated and their contents are incorporated herein.

  Preferred examples of the oxime sulfonate compound, that is, a compound having an oxime sulfonate structure include compounds having an oxime sulfonate structure represented by the following general formula (B1).

General formula (B1)
(In the general formula (B1), R ²¹ represents an alkyl group or an aryl group. A wavy line represents a bond with another group.)

Any group may be substituted, and the alkyl group in R ²¹ may be linear, branched or cyclic. Acceptable substituents are described below.
As the alkyl group for R ^21, a linear or branched alkyl group having 1 to 10 carbon atoms is preferable. The alkyl group represented by R ²¹ is an aryl group having 6 to 11 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, or a cycloalkyl group (7,7-dimethyl-2-oxonorbornyl group or the like It may be substituted with a cyclic group, preferably a bicycloalkyl group or the like.
As the aryl group for R ^21, an aryl group having 6 to 11 carbon atoms is preferable, and a phenyl group or a naphthyl group is more preferable. The aryl group of R ²¹ may be substituted with a lower alkyl group, an alkoxy group, or a halogen atom.

  The compound containing an oxime sulfonate structure represented by the general formula (B1) is also preferably an oxime sulfonate compound represented by the following general formula (B2).

(In the formula (B2), R ⁴² represents an alkyl group or an aryl group, X represents an alkyl group, an alkoxy group, or a halogen atom, m4 represents an integer of 0 to 3, and m4 represents 2 or When X is 3, the plurality of X may be the same or different.)

The alkyl group as X is preferably a linear or branched alkyl group having 1 to 4 carbon atoms.
The alkoxy group as X is preferably a linear or branched alkoxy group having 1 to 4 carbon atoms.
The halogen atom as X is preferably a chlorine atom or a fluorine atom.
m4 is preferably 0 or 1. In the general formula (B2), m4 is 1, X is a methyl group, the substitution position of X is an ortho position, R ⁴² is a linear alkyl group having 1 to 10 carbon atoms, 7,7- A compound that is a dimethyl-2-oxonorbornylmethyl group or a p-toluyl group is particularly preferred.

  The compound containing the oxime sulfonate structure represented by the general formula (B1) is also preferably an oxime sulfonate compound represented by the following general formula (B3).

(In formula (B3), R ⁴³ has the same meaning as R ⁴² in formula (B2), and X ¹ is a halogen atom, a hydroxyl group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, cyano A group or a nitro group, and n4 represents an integer of 0 to 5.)

R ⁴³ in the general formula (B3) is methyl group, ethyl group, n-propyl group, n-butyl group, n-octyl group, trifluoromethyl group, pentafluoroethyl group, perfluoro-n-propyl group. Perfluoro-n-butyl group, p-tolyl group, 4-chlorophenyl group or pentafluorophenyl group is preferable, and n-octyl group is particularly preferable.
X ¹ is preferably an alkoxy group having 1 to 5 carbon atoms, and more preferably a methoxy group.
As n4, 0-2 are preferable and 0-1 are especially preferable.

  Specific examples of the compound represented by the general formula (B3) include α- (methylsulfonyloxyimino) benzyl cyanide, α- (ethylsulfonyloxyimino) benzyl cyanide, α- (n-propylsulfonyloxyimino). ) Benzyl cyanide, α- (n-butylsulfonyloxyimino) benzyl cyanide, α- (4-toluenesulfonyloxyimino) benzyl cyanide, α-[(methylsulfonyloxyimino) -4-methoxyphenyl] acetonitrile, α-[(ethylsulfonyloxyimino) -4-methoxyphenyl] acetonitrile, α-[(n-propylsulfonyloxyimino) -4-methoxyphenyl] acetonitrile, α-[(n-butylsulfonyloxyimino) -4- Methoxyphenyl] acetonitrile, α-[(4- Toluene sulfonyl) -4-methoxyphenyl] can be mentioned acetonitrile.

  Specific examples of preferred oxime sulfonate compounds include the following compounds (i) to (viii) and the like, and these can be used alone or in combination of two or more. Compounds (i) to (viii) can be obtained as commercial products. Moreover, it can also be used in combination with another kind of (B) photo-acid generator.

  The compound containing an oxime sulfonate structure represented by the general formula (B1) is also preferably a compound represented by the following general formula (OS-1).

In the general formula (OS-1), R ¹⁰¹ represents a hydrogen atom, an alkyl group, an alkenyl group, an alkoxy group, an alkoxycarbonyl group, an acyl group, a carbamoyl group, a sulfamoyl group, a sulfo group, a cyano group, an aryl group, or Represents a heteroaryl group. ^R102 represents an alkyl group or an aryl group.
X ¹⁰¹ represents —O—, —S—, —NH—, —NR ¹⁰⁵ —, —CH ₂ —, —CR ¹⁰⁶ H—, or —CR ¹⁰⁵ R ¹⁰⁷ —, wherein R ^{105 to} R ¹⁰⁷ are alkyl groups. Or an aryl group.
R ^{121 to} R ¹²⁴ each independently represents a hydrogen atom, a halogen atom, an alkyl group, an alkenyl group, an alkoxy group, an amino group, an alkoxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group, an amide group, a sulfo group, a cyano group, Or an aryl group is represented. Two of R ^{121 to} R ¹²⁴ may be bonded to each other to form a ring.
As R ^{121 to} R ¹²⁴ , a hydrogen atom, a halogen atom, and an alkyl group are preferable, and an embodiment in which at least two of R ^{121 to} R ¹²⁴ are bonded to each other to form an aryl group is also preferable. Among these, an embodiment in which R ^{121 to} R ¹²⁴ are all hydrogen atoms is preferable from the viewpoint of sensitivity.
Any of the aforementioned functional groups may further have a substituent.

  The compound represented by the general formula (OS-1) is more preferably a compound represented by the following general formula (OS-2).

In the general formula (OS-2), R ¹⁰¹ , R ¹⁰² , R ^{121 to} R ¹²⁴ are respectively synonymous with those in the formula (OS-1), and preferred examples are also the same.
Among these, the embodiment in which R ¹⁰¹ in the general formula (OS-1) and the general formula (OS-2) is a cyano group or an aryl group is more preferable, and is represented by the general formula (OS-2). And R ¹⁰¹ is most preferably a cyano group, a phenyl group, or a naphthyl group.

  In the oxime sulfonate compound, the steric structure (E, Z, etc.) of the oxime or benzothiazole ring may be either one or a mixture.

  Specific examples of the compound represented by the general formula (OS-1) that can be suitably used in the present invention include the compounds described in paragraph numbers 0128 to 0132 of JP2011-221494A (exemplified compounds b-1 to 1). b-34), but the present invention is not limited thereto.

  In the present invention, the compound containing the oxime sulfonate structure represented by the general formula (B1) is represented by the following general formula (OS-3), the following general formula (OS-4) or the following general formula (OS-5). It is preferable that it is an oxime sulfonate compound represented by these.

(In the general formula (OS-3) to general formula (OS-5), R ²² , R ²⁵ and R ²⁸ each independently represents an alkyl group, an aryl group or a heteroaryl group, and R ²³ , R ²⁶ and R ²⁹ Each independently represents a hydrogen atom, an alkyl group, an aryl group or a halogen atom, and R ²⁴ , R ²⁷ and R ³⁰ each independently represent a halogen atom, an alkyl group, an alkyloxy group, a sulfonic acid group, an aminosulfonyl group or an alkoxysulfonyl group. X ^{1 to} X ³ each independently represents an oxygen atom or a sulfur atom, n ^{1 to} n ³ each independently represents 1 or 2, and m ^{1 to} m ³ each independently represents an integer of 0 to 6 Represents.)

In the general formulas (OS-3) to (OS-5), the alkyl group, aryl group or heteroaryl group in R ²² , R ²⁵ and R ²⁸ may have a substituent.
In the formulas (OS-3) to (OS-5), the alkyl group in R ²² , R ²⁵ and R ²⁸ is an alkyl group having 1 to 30 carbon atoms which may have a substituent. Is preferred.

Moreover, in said general formula (OS-3)-(OS-5), as an aryl group in R <^22> , R <^25> and R < ²⁸ >, the aryl group with a total carbon number of 6-30 which may have a substituent is mentioned. preferable.

Further, in the general formula (OS-3) ~ (OS -5), as the heteroaryl group in R ^1, heteroaryl group having a total carbon number of 4-30 which may have a substituent is preferable.

In the general formulas (OS-3) to (OS-5), at least one ring of the heteroaryl group in R ²² , R ²⁵ and R ²⁸ may be a heteroaromatic ring. For example, a heteroaromatic ring and benzene The ring may be condensed.

In the general formulas (OS-3) to (OS-5), R ²³ , R ²⁶ and R ²⁹ are preferably a hydrogen atom, an alkyl group or an aryl group, more preferably a hydrogen atom or an alkyl group. preferable.
In the general formulas (OS-3) to (OS-5), one or two of R ²³ , R ²⁶ and R ²⁹ present in the compound is an alkyl group, an aryl group or a halogen atom. It is more preferable that one is an alkyl group, an aryl group or a halogen atom, and it is particularly preferable that one is an alkyl group and the rest is a hydrogen atom.

The alkyl group for R ²³ , R ²⁶ and R ²⁹ is preferably an alkyl group having 1 to 12 carbon atoms which may have a substituent, and 1 to 1 carbon atoms which may have a substituent. More preferred is an alkyl group of 6.

The aryl group for R ²³ , R ²⁶ and R ²⁹ is preferably an aryl group having 6 to 30 carbon atoms which may have a substituent.

In the general formulas (OS-3) to (OS-5), X ^{1 to} X ³ each independently represents O or S, and is preferably O.
In the general formulas (OS-3) to (OS-5), the ring containing X ^{1 to} X ³ as a ring member is a 5-membered ring or a 6-membered ring.
In the general formulas (OS-3) to (OS-5), n ^{1 to} n ³ each independently represent 1 or 2, and when X ^{1 to} X ³ are O, n ^{1 to} n ³ are each independently 1 is preferable, and when X ^{1 to} X ³ are S, n ^{1 to} n ³ are preferably 2 each independently.

In the general formulas (OS-3) to (OS-5), R ²⁴ , R ²⁷ and R ³⁰ each independently represent a halogen atom, an alkyl group, an alkyloxy group, a sulfonic acid group, an aminosulfonyl group or an alkoxysulfonyl group. Represent. Among them, R ²⁴ , R ²⁷ and R ³⁰ are preferably each independently an alkyl group or an alkyloxy group.
The alkyl group, alkyloxy group, sulfonic acid group, aminosulfonyl group and alkoxysulfonyl group in R ²⁴ , R ²⁷ and R ³⁰ may have a substituent.
In the general formulas (OS-3) to (OS-5), the alkyl group in R ²⁴ , R ²⁷ and R ³⁰ is an alkyl group having 1 to 30 carbon atoms which may have a substituent. It is preferable.

In the general formulas (OS-3) to (OS-5), the alkyloxy group in R ²⁴ , R ²⁷ and R ³⁰ is an alkyloxy group having 1 to 30 carbon atoms which may have a substituent. Preferably there is.

In the general formulas (OS-3) to (OS-5), m ^{1 to} m ³ each independently represents an integer of 0 to 6, preferably an integer of 0 to 2, preferably 0 or 1. More preferably, it is particularly preferably 0.
Further, for each of the substituents of (OS-3) to (OS-5), the substitution of (OS-3) to (OS-5) described in paragraph Nos. 0092 to 0109 of JP2011-221494A. The preferred range of groups is likewise preferred.

  The compound containing an oxime sulfonate structure represented by the general formula (B1) is particularly preferably a compound represented by any one of the following general formulas (OS-6) to (OS-11).

(In the formulas (OS-6) to (OS-11), R ^{301 to} R ³⁰⁶ represent an alkyl group, an aryl group, or a heteroaryl group, R ³⁰⁷ represents a hydrogen atom or a bromine atom, and R ^{308 to} R ³¹⁰ , R ³¹³ , R ³¹⁶ and R ³¹⁸ each independently represent a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a halogen atom, a chloromethyl group, a bromomethyl group, a bromoethyl group, a methoxymethyl group, a phenyl group or a chlorophenyl group; R ³¹¹ and R ³¹⁴ each independently represent a hydrogen atom, a halogen atom, a methyl group or a methoxy group, and R ³¹² , R ³¹⁵ , R ³¹⁷ and R ³¹⁹ each independently represent a hydrogen atom or a methyl group.)

  Preferred ranges in the general formulas (OS-6) to (OS-11) are preferred ranges of (OS-6) to (OS-11) described in paragraph numbers 0110 to 0112 of JP2011-221494A. It is the same.

  Specific examples of the oxime sulfonate compound represented by the general formula (OS-3) to the general formula (OS-5) include compounds described in paragraph numbers 0114 to 0120 of JP2011-221494A. However, the present invention is not limited to these.

The compound containing the oxime sulfonate structure represented by the general formula (B1) is also preferably an oxime sulfonate compound represented by the following general formula (B4).
(In General Formula (B4), R ¹ represents an alkyl group or an aryl group, R ² represents an alkyl group, an aryl group, or a heteroaryl group. R ^{3 to} R ⁶ represent a hydrogen atom or an alkyl group, respectively. A group, an aryl group, or a halogen atom, provided that R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ may combine to form an alicyclic or aromatic ring, and X is — Represents O- or -S-.)

R ¹ represents an alkyl group or an aryl group. The alkyl group is preferably a branched alkyl group or a cyclic alkyl group.
The alkyl group preferably has 3 to 10 carbon atoms. In particular, when the alkyl group has a branched structure, an alkyl group having 3 to 6 carbon atoms is preferable, and when the alkyl group has a cyclic structure, an alkyl group having 5 to 7 carbon atoms is preferable.
Examples of the alkyl group include propyl group, isopropyl group, n-butyl group, s-butyl group, isobutyl group, tert-butyl group, pentyl group, isopentyl group, neopentyl group, 1,1-dimethylpropyl group, hexyl group. , 2-ethylhexyl group, cyclohexyl group, octyl group and the like, preferably isopropyl group, tert-butyl group, neopentyl group, and cyclohexyl group.
Carbon number of an aryl group becomes like this. Preferably it is 6-12, More preferably, it is 6-8, More preferably, it is 6-7. Examples of the aryl group include a phenyl group and a naphthyl group, and a phenyl group is preferable.
The alkyl group and aryl group represented by R ¹ may have a substituent. Examples of the substituent include a halogen atom (a fluorine atom, a chloro atom, a bromine atom, an iodine atom), a linear, branched or cyclic alkyl group (for example, a methyl group, an ethyl group, a propyl group, etc.), an alkenyl group, an alkynyl group, Aryl group, acyl group, alkoxycarbonyl group, aryloxycarbonyl group, carbamoyl group, cyano group, carboxyl group, hydroxyl group, alkoxy group, aryloxy group, alkylthio group, arylthio group, heterocyclic oxy group, acyloxy group, amino group, A nitro group, a hydrazino group, a heterocyclic group, etc. are mentioned. Further, these groups may be further substituted. Preferably, they are a halogen atom and a methyl group.

In the photosensitive resin composition of the present invention, R ¹ is preferably an alkyl group from the viewpoint of transparency, and R ¹ has a branched structure having 3 to 6 carbon atoms from the viewpoint of achieving both storage stability and sensitivity. An alkyl group, an alkyl group having a cyclic structure having 5 to 7 carbon atoms, or a phenyl group is preferable, and an alkyl group having a branched structure having 3 to 6 carbon atoms or an alkyl group having a cyclic structure having 5 to 7 carbon atoms is more preferable. . By adopting such a bulky group (particularly a bulky alkyl group) as R ¹ , it becomes possible to further improve the transparency. Among the bulky substituents, an isopropyl group, a tert-butyl group, a neopentyl group, and a cyclohexyl group are preferable, and a tert-butyl group and a cyclohexyl group are more preferable.

R ² represents an alkyl group, an aryl group, or a heteroaryl group. As the alkyl group represented by R ² , a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms is preferable. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, an n-butyl group, a tert-butyl group, a pentyl group, a neopentyl group, a hexyl group, and a cyclohexyl group. It is a group.
As the aryl group, an aryl group having 6 to 10 carbon atoms is preferable. Examples of the aryl group include a phenyl group, a naphthyl group, a p-toluyl group (p-methylphenyl group), and a phenyl group and a p-toluyl group are preferable.
Examples of the heteroaryl group include a pyrrole group, an indole group, a carbazole group, a furan group, and a thiophene group.
The alkyl group, aryl group, and heteroaryl group represented by R ² may have a substituent. As a substituent, it is synonymous with the substituent which the alkyl group and aryl group which R < ¹ > may have.
R ² is preferably an alkyl group or an aryl group, more preferably an aryl group, and more preferably a phenyl group. As the substituent for the phenyl group, a methyl group is preferred.

R ^{3 to} R ⁶ each represent a hydrogen atom, an alkyl group, an aryl group, or a halogen atom (a fluorine atom, a chloro atom, a bromine atom, or an iodine atom). The alkyl group represented by R ^{3 to} R ⁶ has the same meaning as the alkyl group represented by R ² , and the preferred range is also the same. The aryl group represented by R ^{3 to} R ⁶ has the same meaning as the aryl group represented by R ¹ , and the preferred range is also the same.
Among R ^{3 to} R ⁶ , R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ may combine to form a ring, and the ring forms an alicyclic ring or an aromatic ring. It is preferable that a benzene ring is more preferable.
R ^{3 to} R ⁶ are each a hydrogen atom, an alkyl group, a halogen atom (fluorine atom, chloro atom, bromine atom), or R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ^6. A benzene ring is preferably formed, and a hydrogen atom, a methyl group, a fluorine atom, a chloro atom, a bromine atom, or R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ are combined to form a benzene ring Is more preferable.
Preferred embodiments of R ^{3 to} R ⁶ are as follows.
(Aspect 1) At least two are hydrogen atoms.
(Aspect 2) The number of alkyl groups, aryl groups, or halogen atoms is one or less.
(Aspect 3) R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ are combined to form a benzene ring.
(Aspect 4) An aspect satisfying the aspects 1 and 2 and / or an aspect satisfying the aspects 1 and 3.

  X represents -O- or -S-.

  Specific examples of the general formula (B4) include the following compounds, but the present invention is not particularly limited thereto. In the exemplified compounds, Ts represents a tosyl group (p-toluenesulfonyl group), Me represents a methyl group, Bu represents an n-butyl group, and Ph represents a phenyl group.

  In the photosensitive resin composition of the present invention, (B) the photoacid generator is based on 100 parts by mass of all resin components (preferably a solid content, more preferably a total of copolymers) in the photosensitive resin composition. 0.1 to 10 parts by mass is preferably used, and 0.5 to 10 parts by mass is more preferably used. Two or more kinds can be used in combination.

<(C) Solvent>
The photosensitive resin composition of the present invention contains (C) a solvent. The photosensitive resin composition of the present invention is preferably prepared as a solution in which the essential components of the present invention and optional components described below are dissolved in the solvent (C).
As the solvent (C) used in the photosensitive resin composition of the present invention, known solvents can be used, such as ethylene glycol monoalkyl ethers, ethylene glycol dialkyl ethers, ethylene glycol monoalkyl ether acetates, propylene. Glycol monoalkyl ethers, propylene glycol dialkyl ethers, propylene glycol monoalkyl ether acetates, diethylene glycol dialkyl ethers, diethylene glycol monoalkyl ether acetates, dipropylene glycol monoalkyl ethers, dipropylene glycol dialkyl ethers, dipropylene glycol Examples include monoalkyl ether acetates, esters, ketones, amides, lactones and the like. Specific examples of the solvent (C) used in the photosensitive resin composition of the present invention include the solvents described in JP-A-2011-221494, paragraph numbers 0174 to 0178, and the contents thereof are described in the present specification. Embedded in the book.

  In addition, benzyl ethyl ether, dihexyl ether, ethylene glycol monophenyl ether acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, isophorone, caproic acid, caprylic acid, 1-octanol, 1-nonal as necessary for these solvents , Benzyl alcohol, anisole, benzyl acetate, ethyl benzoate, diethyl oxalate, diethyl maleate, ethylene carbonate, propylene carbonate and the like can also be added. These solvents can be used alone or in combination of two or more. The solvent that can be used in the present invention is a single type or a combination of two types, more preferably a combination of two types, propylene glycol monoalkyl ether acetates or dialkyl ethers, diacetates. And diethylene glycol dialkyl ethers or esters and butylene glycol alkyl ether acetates are more preferably used in combination.

The solvent is preferably a solvent having a boiling point of 130 ° C. or higher and lower than 160 ° C., a solvent having a boiling point of 160 ° C. or higher, or a mixture thereof.
Solvents having a boiling point of 130 ° C. or higher and lower than 160 ° C. include propylene glycol monomethyl ether acetate (boiling point 146 ° C.), propylene glycol monoethyl ether acetate (boiling point 158 ° C.), propylene glycol methyl-n-butyl ether (boiling point 155 ° C.), propylene glycol An example is methyl-n-propyl ether (boiling point 131 ° C.).
Solvents having a boiling point of 160 ° C. or higher include ethyl 3-ethoxypropionate (boiling point 170 ° C.), diethylene glycol methyl ethyl ether (boiling point 176 ° C.), propylene glycol monomethyl ether propionate (boiling point 160 ° C.), dipropylene glycol methyl ether acetate. (Bp 213 ° C.), 3-methoxybutyl ether acetate (bp 171 ° C.), diethylene glycol diethyl ether (bp 189 ° C.), diethylene glycol dimethyl ether (bp 162 ° C.), propylene glycol diacetate (bp 190 ° C.), diethylene glycol monoethyl ether acetate ( Boiling point 220 ° C), dipropylene glycol dimethyl ether (boiling point 175 ° C), 1,3-butylene glycol diacetate (boiling point 232 ° C) Kill.

  The content of the solvent (C) in the photosensitive resin composition of the present invention is preferably 20 to 95 parts by mass, and preferably 30 to 90 parts by mass, per 100 parts by mass of all components in the photosensitive resin composition. More preferably.

  As described above, the photosensitive resin composition of the present invention includes a polymer component including a polymer that satisfies at least one of the above-described (A1) and (A2), (B) a photoacid generator, and (C). Contains solvent. By using such a photosensitive resin composition, a cured film having a low dielectric constant and low hygroscopicity can be obtained while maintaining sensitivity.

(E) Alkoxysilane compound The photosensitive resin composition of the present invention preferably contains (E) an alkoxysilane compound. When an alkoxysilane compound is used, the adhesion between the film formed from the photosensitive resin composition of the present invention and the substrate can be improved, or the properties of the film formed from the photosensitive resin composition of the present invention can be adjusted. Can do. The (E) alkoxysilane compound that can be used in the photosensitive resin composition of the present invention is an inorganic material serving as a base material, for example, silicon compounds such as silicon, silicon oxide, and silicon nitride, gold, copper, molybdenum, titanium, and aluminum. A compound that improves the adhesion between the metal and the like and the insulating film is preferable. Specifically, a known silane coupling agent or the like is also effective.
Examples of the silane coupling agent include γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrialkoxysilane, γ-glycidoxypropylalkyldialkoxysilane, and γ-methacryloxy. Propyltrialkoxysilane, γ-methacryloxypropylalkyldialkoxysilane, γ-chloropropyltrialkoxysilane, γ-mercaptopropyltrialkoxysilane, β- (3,4-epoxycyclohexyl) ethyltrialkoxysilane, vinyltrialkoxysilane Is mentioned. Of these, γ-glycidoxypropyltrialkoxysilane and γ-methacryloxypropyltrialkoxysilane are more preferable, γ-glycidoxypropyltrialkoxysilane is more preferable, and 3-glycidoxypropyltrimethoxysilane is more preferable. Further preferred. These can be used alone or in combination of two or more.

The following compounds can also be preferably employed.

  In the above, Ph is a phenyl group.

The (E) alkoxysilane compound in the photosensitive resin composition of the present invention is not particularly limited, and a known one can be used.
As for content of the (E) alkoxysilane compound in the photosensitive resin composition of this invention, 0.1-30 mass parts is preferable with respect to 100 mass parts of total solids in the photosensitive composition, 0.5- 20 parts by mass is more preferable.

(H) Basic compound The photosensitive resin composition of the present invention preferably contains (H) a basic compound. (H) The basic compound can be arbitrarily selected from those used in chemically amplified resists. Examples include aliphatic amines, aromatic amines, heterocyclic amines, quaternary ammonium hydroxides, quaternary ammonium salts of carboxylic acids, and the like. Specific examples thereof include compounds described in JP-A-2011-221494, paragraphs 0204 to 0207, and the contents thereof are incorporated in the present specification.

Specific examples of the aliphatic amine include trimethylamine, diethylamine, triethylamine, di-n-propylamine, tri-n-propylamine, di-n-pentylamine, tri-n-pentylamine, diethanolamine, triethanolamine, and the like. Examples include ethanolamine, dicyclohexylamine, and dicyclohexylmethylamine.
Examples of the aromatic amine include aniline, benzylamine, N, N-dimethylaniline, diphenylamine and the like.
Examples of the heterocyclic amine include pyridine, 2-methylpyridine, 4-methylpyridine, 2-ethylpyridine, 4-ethylpyridine, 2-phenylpyridine, 4-phenylpyridine, N-methyl-4-phenylpyridine, 4-dimethylaminopyridine, imidazole, benzimidazole, 4-methylimidazole, 2-phenylbenzimidazole, 2,4,5-triphenylimidazole, nicotine, nicotinic acid, nicotinamide, quinoline, 8-oxyquinoline, pyrazine, Pyrazole, pyridazine, purine, pyrrolidine, piperidine, piperazine, morpholine, 4-methylmorpholine, N-cyclohexyl-N ′-[2- (4-morpholinyl) ethyl] thiourea, 1,5-diazabicyclo [4.3.0 ] -5-Nonene, 1,8-di And azabicyclo [5.3.0] -7-undecene.
Examples of the quaternary ammonium hydroxide include tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetra-n-butylammonium hydroxide, and tetra-n-hexylammonium hydroxide.
Examples of the quaternary ammonium salt of carboxylic acid include tetramethylammonium acetate, tetramethylammonium benzoate, tetra-n-butylammonium acetate, and tetra-n-butylammonium benzoate.

  The basic compounds that can be used in the present invention may be used singly or in combination of two or more.

  The content of the basic compound (H) in the photosensitive resin composition of the present invention is preferably 0.001 to 3 parts by mass with respect to 100 parts by mass of the total solid content in the photosensitive resin composition. More preferably, it is 0.005 to 2 parts by mass.

(I) Surfactant The photosensitive resin composition of the present invention preferably contains (I) a surfactant. (I) As the surfactant, any of anionic, cationic, nonionic or amphoteric can be used, but a preferred surfactant is a nonionic surfactant.
Examples of nonionic surfactants include polyoxyethylene higher alkyl ethers, polyoxyethylene higher alkyl phenyl ethers, higher fatty acid diesters of polyoxyethylene glycol, silicone-based and fluorine-based surfactants. . In addition, the following trade names are KP (manufactured by Shin-Etsu Chemical Co., Ltd.), Polyflow (manufactured by Kyoeisha Chemical Co., Ltd.), F Top (manufactured by JEMCO), Mega Fuck (manufactured by DIC Corporation), Florard (Sumitomo 3M) (Manufactured by Co., Ltd.), Asahi Guard, Surflon (manufactured by Asahi Glass Co., Ltd.), PolyFox (manufactured by OMNOVA), SH-8400 (Toray Dow Corning Silicone), and the like.
Further, as a surfactant, it contains a structural unit A and a structural unit B represented by the following general formula (I-1), and is converted to polystyrene measured by gel permeation chromatography using tetrahydrofuran (THF) as a solvent. A copolymer having a weight average molecular weight (Mw) of 1,000 or more and 10,000 or less can be given as a preferred example.

Formula (I-1)
(In Formula (I-1), R ⁴⁰¹ and R ⁴⁰³ each independently represent a hydrogen atom or a methyl group, R ⁴⁰² represents a linear alkylene group having 1 to 4 carbon atoms, and R ⁴⁰⁴ represents a hydrogen atom or C represents an alkyl group having 1 to 4 carbon atoms, L represents an alkylene group having 3 to 6 carbon atoms, p and q are mass percentages representing a polymerization ratio, and p is 10 mass% to 80 mass%. A numerical value is represented, q represents a numerical value of 20% by mass or more and 90% by mass or less, r represents an integer of 1 to 18 and s represents an integer of 1 to 10)

The L is preferably a branched alkylene group represented by the following general formula (I-2). R ⁴⁰⁵ in the general formula (I-2) represents an alkyl group having 1 to 4 carbon atoms, and is preferably an alkyl group having 1 to 3 carbon atoms in terms of compatibility and wettability to the coated surface. A number 2 or 3 alkyl group is more preferred. The sum (p + q) of p and q is preferably p + q = 100, that is, 100% by mass.

Formula (I-2)

  The weight average molecular weight (Mw) of the copolymer is more preferably from 1,500 to 5,000.

These surfactants can be used individually by 1 type or in mixture of 2 or more types.
The addition amount of (I) surfactant in the photosensitive resin composition of the present invention is preferably 10 parts by mass or less with respect to 100 parts by mass of the total solid content in the photosensitive resin composition, 0.001 It is more preferable that it is -10 mass parts, and it is still more preferable that it is 0.01-3 mass parts.

<Other ingredients>
In addition to the said component, a sensitizer, a crosslinking agent, and antioxidant can be preferably added to the photosensitive resin composition of this invention as needed. Furthermore, the photosensitive resin composition of the present invention includes an acid proliferation agent, a development accelerator, a plasticizer, a thermal radical generator, a thermal acid generator, an ultraviolet absorber, a thickener, and an organic or inorganic precipitation inhibitor. Known additives such as can be added.

Sensitizer The photosensitive resin composition of the present invention preferably contains a sensitizer in order to promote its decomposition in combination with (B) a photoacid generator. The sensitizer absorbs actinic rays or radiation and enters an electronically excited state. The sensitizer in an electronically excited state comes into contact with the photoacid generator, and effects such as electron transfer, energy transfer, and heat generation occur. Thereby, a photo-acid generator raise | generates a chemical change and decomposes | disassembles and produces | generates an acid. Examples of preferred sensitizers include compounds belonging to the following compounds and having an absorption wavelength in any of the wavelength ranges from 350 nm to 450 nm.

Polynuclear aromatics (eg, pyrene, perylene, triphenylene, anthracene, 9,10-dibutoxyanthracene, 9,10-diethoxyanthracene, 3,7-dimethoxyanthracene, 9,10-dipropyloxyanthracene), xanthenes (Eg, fluorescein, eosin, erythrosine, rhodamine B, rose bengal), xanthones (eg, xanthone, thioxanthone, dimethylthioxanthone, diethylthioxanthone), cyanines (eg, thiacarbocyanine, oxacarbocyanine), merocyanines ( For example, merocyanine, carbomerocyanine), rhodocyanines, oxonols, thiazines (eg, thionine, methylene blue, toluidine blue), acridines (eg, acridine oleoresin) Di, chloroflavin, acriflavine), acridones (eg, acridone, 10-butyl-2-chloroacridone), anthraquinones (eg, anthraquinone), squariums (eg, squalium), styryls, base styryls ( For example, 2- [2- [4- (dimethylamino) phenyl] ethenyl] benzoxazole), coumarins (eg, 7-diethylamino-4-methylcoumarin, 7-hydroxy-4-methylcoumarin, 2, 3, 6 , 7-tetrahydro-9-methyl-1H, 5H, 11H [1] benzopyrano [6,7,8-ij] quinolidine-11-non).
Among these sensitizers, polynuclear aromatics, acridones, styryls, base styryls, and coumarins are preferable, and polynuclear aromatics are more preferable. Of the polynuclear aromatics, anthracene derivatives are most preferred.

  The addition amount of the sensitizer in the photosensitive resin composition of the present invention is preferably 0 to 1000 parts by mass, and 10 to 500 parts by mass with respect to 100 parts by mass of the photoacid generator of the photosensitive resin composition. It is more preferable that it is 50-200 mass parts. Two or more sensitizers can be used in combination.

Crosslinking agent It is preferable that the photosensitive resin composition of this invention contains a crosslinking agent as needed. By adding a crosslinking agent, the cured film obtained by the photosensitive resin composition of the present invention can be made a stronger film.
The crosslinking agent is not limited as long as a crosslinking reaction is caused by heat. (Excluding component A). For example, a compound having two or more epoxy groups or oxetanyl groups in the molecule described below, an alkoxymethyl group-containing crosslinking agent, a compound having at least one ethylenically unsaturated double bond, a blocked isocyanate compound, etc. Can be added.
It is preferable that the addition amount of the crosslinking agent in the photosensitive resin composition of this invention is 0.01-50 mass parts with respect to 100 mass parts of total solids of the photosensitive resin composition, 0.1-30 It is more preferable that it is a mass part, and it is still more preferable that it is 0.5-20 mass parts. By adding in this range, a cured film having excellent mechanical strength and solvent resistance can be obtained. A plurality of crosslinking agents may be used in combination, and in that case, the content is calculated by adding all the crosslinking agents.

<Compound having two or more epoxy groups or oxetanyl groups in the molecule>
Specific examples of compounds having two or more epoxy groups in the molecule include bisphenol A type epoxy resins, bisphenol F type epoxy resins, phenol novolac type epoxy resins, cresol novolac type epoxy resins, aliphatic epoxy resins, and the like. Can do.

These are available as commercial products. Examples thereof include commercially available products such as JER157S70 and JER157S65 (manufactured by Mitsubishi Chemical Holdings Co., Ltd.), paragraph number 0189 of JP2011-221494A, and others, such as Denacol EX-611, EX-612, EX-614, EX-614B, EX-622, EX-512, EX-521, EX-411, EX-421, EX-313, EX-314, EX-321, EX-211, EX-212, EX- 810, EX-811, EX-850, EX-851, EX-821, EX-830, EX-832, EX-841, EX-911, EX-941, EX-920, EX-931, EX-212L, EX-214L, EX-216L, EX-321L, EX-850L, DLC-201, DLC-2 3, DLC-204, DLC-205, DLC-206, DLC-301, DLC-402 (manufactured by Nagase Chemtech), YH-300, YH-301, YH-302, YH-315, YH-324, YH -325 (manufactured by Nippon Steel Chemical Co., Ltd.).
These can be used alone or in combination of two or more.

  Among these, bisphenol A type epoxy resin, bisphenol F type epoxy resin, phenol novolac type epoxy resin and aliphatic epoxy resin are more preferable, and bisphenol A type epoxy resin is particularly preferable.

  As specific examples of the compound having two or more oxetanyl groups in the molecule, Aron oxetane OXT-121, OXT-221, OX-SQ, PNOX (manufactured by Toagosei Co., Ltd.) can be used.

  Moreover, it is preferable to use the compound containing an oxetanyl group individually or in mixture with the compound containing an epoxy group.

  As other crosslinking agents, alkoxymethyl group-containing crosslinking agents described in paragraphs 0107 to 0108 of JP2012-8223A and compounds having at least one ethylenically unsaturated double bond are also preferably used. The contents of which are incorporated herein by reference. As the alkoxymethyl group-containing crosslinking agent, alkoxymethylated glycoluril is preferable.

<Block isocyanate compound>
In the photosensitive resin composition of the present invention, a blocked isocyanate compound can also be preferably employed as a crosslinking agent. The blocked isocyanate compound is not particularly limited as long as it is a compound having a blocked isocyanate group, but is preferably a compound having two or more blocked isocyanate groups in one molecule from the viewpoint of curability.
In addition, the blocked isocyanate group in this invention is a group which can produce | generate an isocyanate group with a heat | fever, For example, the group which reacted the blocking agent and the isocyanate group and protected the isocyanate group can illustrate preferably. Moreover, it is preferable that the said block isocyanate group is a group which can produce | generate an isocyanate group with the heat | fever of 90 to 250 degreeC.
Further, the skeleton of the blocked isocyanate compound is not particularly limited and may be any as long as it has two isocyanate groups in one molecule, and is aliphatic, alicyclic or aromatic. Polyisocyanate may be used, for example, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, isophorone diisocyanate, 1,6-hexamethylene diisocyanate, 1,3-trimethylene diisocyanate, 1,4-tetramethylene Diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, 1,9-nonamethylene diisocyanate, 1,10-decamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 2 2'-diethyl ether diisocyanate, diphenylmethane-4,4'-diisocyanate, o-xylene diisocyanate, m-xylene diisocyanate, p-xylene diisocyanate, methylene bis (cyclohexyl isocyanate), cyclohexane-1,3-dimethylene diisocyanate, cyclohexane-1 , 4-Dimethylene diisocyanate, 1,5-naphthalene diisocyanate, p-phenylene diisocyanate, 3,3′-methylene ditolylene-4,4′-diisocyanate, 4,4′-diphenyl ether diisocyanate, tetrachlorophenylene diisocyanate, norbornane diisocyanate , Hydrogenated 1,3-xylylene diisocyanate, hydrogenated 1,4-xylylene diisocyanate, etc. And prepolymer type skeleton compounds derived from these compounds can be suitably used. Among these, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI) are particularly preferable.

Examples of the matrix structure of the blocked isocyanate compound in the photosensitive resin composition of the present invention include biuret type, isocyanurate type, adduct type, and bifunctional prepolymer type.
Examples of the blocking agent that forms the block structure of the blocked isocyanate compound include oxime compounds, lactam compounds, phenol compounds, alcohol compounds, amine compounds, active methylene compounds, pyrazole compounds, mercaptan compounds, imidazole compounds, imide compounds, and the like. be able to. Among these, a blocking agent selected from oxime compounds, lactam compounds, phenol compounds, alcohol compounds, amine compounds, active methylene compounds, and pyrazole compounds is particularly preferable.

Examples of the oxime compound include oxime and ketoxime, and specific examples include formaldoxime, cyclohexane oxime, methyl ethyl ketone oxime, cyclohexanone oxime, benzophenone oxime, and acetoxime.
Examples of the lactam compound include ε-caprolactam and γ-butyrolactam.
Examples of the phenol compound include phenol, naphthol, cresol, xylenol, and halogen-substituted phenol.
Examples of the alcohol compound include methanol, ethanol, propanol, butanol, cyclohexanol, ethylene glycol monoalkyl ether, propylene glycol monoalkyl ether, and alkyl lactate.
Examples of the amine compound include primary amines and secondary amines, which may be aromatic amines, aliphatic amines, and alicyclic amines, and examples include aniline, diphenylamine, ethyleneimine, and polyethyleneimine.
Examples of the active methylene compound include diethyl malonate, dimethyl malonate, ethyl acetoacetate, methyl acetoacetate and the like.
Examples of the pyrazole compound include pyrazole, methylpyrazole, dimethylpyrazole and the like.
Examples of the mercaptan compound include alkyl mercaptans and aryl mercaptans.

  The blocked isocyanate compound that can be used in the photosensitive resin composition of the present invention is commercially available. For example, Coronate AP Stable M, Coronate 2503, 2515, 2507, 2513, 2555, Millionate MS-50 (or more, Nippon Polyurethane Industry Co., Ltd.), Takenate B-830, B-815N, B-820NSU, B-842N, B-846N, B-870N, B-874N, B-882N (above, manufactured by Mitsui Chemicals, Inc.) ), Duranate 17B-60PX, 17B-60P, TPA-B80X, TPA-B80E, MF-B60X, MF-B60B, MF-K60X, MF-K60B, E402-B80B, SBN-70D, SBB-70P, K6000 (and above) , Manufactured by Asahi Kasei Chemicals Corporation, Death Module BL 100, BL1265 MPA / X, BL3575 / 1, BL3272MPA, BL3370MPA, BL3475BA / SN, BL5375MPA, VPLS2078 / 2, BL4265SN, PL340, PL350, Sumidur BL3175 (above, manufactured by Sumika Bayer Urethane Co., Ltd.), etc. are preferably used can do.

Antioxidant The photosensitive resin composition of the present invention may contain an antioxidant. As an antioxidant, a well-known antioxidant can be contained. By adding an antioxidant, there is an advantage that coloring of the cured film can be prevented, or a decrease in film thickness due to decomposition can be reduced, and heat-resistant transparency is excellent.
Examples of such antioxidants include phosphorus antioxidants, amides, hydrazides, hindered amine antioxidants, sulfur antioxidants, phenol antioxidants, ascorbic acids, zinc sulfate, sugars, Examples thereof include nitrates, sulfites, thiosulfates, and hydroxylamine derivatives. Among these, phenol-based antioxidants, amide-based antioxidants, hydrazide-based antioxidants, and sulfur-based antioxidants are particularly preferable from the viewpoint of coloring the cured film and reducing the film thickness. These may be used individually by 1 type and may mix 2 or more types.
Examples of commercially available phenolic antioxidants include ADK STAB AO-15, ADK STAB AO-18, ADK STAB AO-20, ADK STAB AO-23, ADK STAB AO-30, ADK STAB AO-37, ADK STAB AO-40 and ADK STAB AO. -50, ADK STAB AO-51, ADK STAB AO-60, ADK STAB AO-70, ADK STAB AO-80, ADK STAB AO-330, ADK STAB AO-412S, ADK STAB AO-503, ADK STAB A-611, ADK STAB A-612, ADK STAB A -613, ADK STAB PEP-4C, ADK STAB PEP-8, ADK STAB PEP-8W, ADK STAB PEP-24G, ADK STAB PEP-36, ADK STAB PEP-36Z, ADK STAB HP-1 , ADK STAB 2112, ADK STAB 260, ADK STAB 1522, ADK STAB 1178, ADK STAB 1500, ADK STAB 135A, ADK STAB 3010, ADK STAB TPP, ADK STAB CDA-1, ADK STAB CDA-6, ADK STAB ZS-27, ADK STAB ZS 90, ADK STAB ZS 90 -91 (above, manufactured by ADEKA Corporation), Irganox 245FF, Irganox 1010FF, Irganox 1010, Irganox MD1024, Irganox 1035FF, Irganox 1035, Irganox 1098, Irganox 1330, Irganox 1520L, Irganox 3114, Irganox 1726, Irgafos 168, Irgamod 295 (BAS Co., Ltd.), and the like. Among these, ADK STAB AO-60, ADK STAB AO-80, Irganox 1726, Irganox 1035, and Irganox 1098 can be preferably used.

The content of the antioxidant is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, based on the total solid content of the photosensitive resin composition. It is particularly preferably 5 to 4% by mass. By setting it within this range, sufficient transparency of the formed film can be obtained, and the sensitivity at the time of pattern formation becomes good.
As additives other than antioxidants, various ultraviolet absorbers described in “New Development of Polymer Additives (Nikkan Kogyo Shimbun Co., Ltd.)”, metal deactivators, and the like are used in the present invention. You may add to a resin composition.

[Acid multiplication agent]
In the photosensitive resin composition of the present invention, an acid proliferating agent can be used for the purpose of improving sensitivity.
The acid proliferating agent that can be used in the present invention is a compound that can further generate an acid by an acid-catalyzed reaction to increase the acid concentration in the reaction system, and is a compound that exists stably in the absence of an acid. is there. In such a compound, since one or more acids increase in one reaction, the reaction proceeds at an accelerated rate as the reaction proceeds. However, the generated acid itself induces self-decomposition, and is generated here. The acid strength is preferably 3 or less as an acid dissociation constant, pKa, and particularly preferably 2 or less.
Specific examples of the acid proliferating agent include paragraph numbers 0203 to 0223 of JP-A-10-1508, paragraphs 0016 to 0055 of JP-A-10-282642, and page 39 of JP-A-9-512498. The compounds described on line 12 to page 47, line 2 are mentioned, the contents of which are incorporated herein.
Examples of the acid proliferating agent that can be used in the present invention include pKa such as dichloroacetic acid, trichloroacetic acid, methanesulfonic acid, benzenesulfonic acid, trifluoromethanesulfonic acid, and phenylphosphonic acid, which are decomposed by an acid generated from the acid generator. Examples include compounds that generate 3 or less acids.
Specific examples include the following.
The content of the acid proliferating agent in the photosensitive composition is 10 to 1,000 parts by mass with respect to 100 parts by mass of the photoacid generator, from the viewpoint of dissolution contrast between the exposed part and the unexposed part. Preferably, the amount is 20 to 500 parts by mass.

[Development accelerator]
The photosensitive resin composition of the present invention can contain a development accelerator.
As the development accelerator, the description of paragraph numbers 0171 to 0172 of JP2012-042837A can be referred to, and the contents thereof are incorporated in the present specification.
A development accelerator may be used individually by 1 type, and can also use 2 or more types together.
The addition amount of the development accelerator in the photosensitive resin composition of the present invention is preferably 0 to 30 parts by mass with respect to 100 parts by mass of the total solid content of the photosensitive composition from the viewpoint of sensitivity and residual film ratio. 1-20 mass parts is more preferable, and it is most preferable that it is 0.5-10 mass parts.
In addition, as other additives, a thermal radical generator described in paragraph Nos. 0120 to 0121 of JP2012-8223A, a nitrogen-containing compound and a thermal acid generator described in WO2011 / 136074A1, can be used. Is incorporated herein by reference.

<Method for preparing photosensitive resin composition>
Each component is mixed in a predetermined ratio and by any method, stirred and dissolved to prepare a photosensitive resin composition. For example, a resin composition can be prepared by preparing a solution in which components are dissolved in a solvent in advance and then mixing them in a predetermined ratio. The composition solution prepared as described above can be used after being filtered using a filter having a pore size of 0.2 μm or the like.

[Method for producing cured film]
Next, the manufacturing method of the cured film of this invention is demonstrated.
The method for producing a cured film of the present invention preferably includes the following steps (1) to (5).
(1) The process of apply | coating the photosensitive resin composition of this invention on a board | substrate;
(2) A step of removing the solvent from the applied photosensitive resin composition;
(3) The process of exposing the photosensitive resin composition from which the solvent was removed with actinic rays;
(4) A step of developing the exposed photosensitive resin composition with an aqueous developer;
(5) A post-baking step of thermosetting the developed photosensitive resin composition.
Each step will be described below in order.

In the application step (1), the photosensitive resin composition of the present invention is preferably applied onto a substrate to form a wet film containing a solvent. Before applying the photosensitive resin composition to the substrate, it is preferable to perform substrate cleaning such as alkali cleaning or plasma cleaning, and it is more preferable to treat the substrate surface with hexamethyldisilazane after substrate cleaning. By performing this treatment, the adhesiveness of the photosensitive resin composition to the substrate tends to be improved. The method for treating the substrate surface with hexamethyldisilazane is not particularly limited, and examples thereof include a method in which the substrate is exposed to hexamethyldisilazane vapor.
Examples of the substrate include inorganic substrates, resins, and resin composite materials.
Examples of the inorganic substrate include glass, quartz, silicone, silicon nitride, and a composite substrate in which molybdenum, titanium, aluminum, copper, or the like is vapor-deposited on such a substrate.
The resins include polybutylene terephthalate, polyethylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polystyrene, polycarbonate, polysulfone, polyethersulfone, polyarylate, allyl diglycol carbonate, polyamide, polyimide, polyamideimide, polyetherimide, poly Fluorine resins such as benzazole, polyphenylene sulfide, polycycloolefin, norbornene resin, polychlorotrifluoroethylene, liquid crystal polymer, acrylic resin, epoxy resin, silicone resin, ionomer resin, cyanate resin, crosslinked fumaric acid diester, cyclic polyolefin, aromatic Made of synthetic resin such as aromatic ether, maleimide-olefin, cellulose, episulfide compound And the like.
These substrates are rarely used in the above-described form, and usually, a multilayer laminated structure such as a TFT element is formed depending on the form of the final product.
The coating method on the substrate is not particularly limited, and for example, a slit coating method, a spray method, a roll coating method, a spin coating method, a casting coating method, a slit and spin method, or the like can be used. Furthermore, it is also possible to apply a so-called pre-wet method as described in JP 2009-145395 A.
The wet film thickness when applied is not particularly limited and can be applied with a film thickness according to the application, but it is usually used in the range of 0.5 to 10 μm.

  In the solvent removal step (2), the solvent is removed from the applied film by vacuum (vacuum) and / or heating to form a dry coating film on the substrate. The heating conditions for the solvent removal step are preferably 70 to 130 ° C. and about 30 to 300 seconds. When the temperature and time are within the above ranges, the pattern adhesion is better and the residue tends to be further reduced.

In the exposure step (3), the substrate provided with the coating film is irradiated with actinic rays through a mask having a predetermined pattern. In this step, the photoacid generator is decomposed to generate an acid. By the catalytic action of the generated acid, the acid-decomposable group contained in the coating film component is hydrolyzed to produce a carboxyl group or a phenolic hydroxyl group.
As an exposure light source using actinic light, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a chemical lamp, an LED light source, an excimer laser generator, etc. can be used, and g-line (436 nm), i-line (365 nm), h-line ( Actinic rays having a wavelength of 300 nm to 450 nm, such as 405 nm), can be preferably used. Moreover, irradiation light can also be adjusted through spectral filters, such as a long wavelength cut filter, a short wavelength cut filter, and a band pass filter, as needed.
As the exposure apparatus, various types of exposure machines such as a mirror projection aligner, a stepper, a scanner, a proximity, a contact, a microlens array, a lens scanner, and a laser exposure can be used.
In order to accelerate the hydrolysis reaction in the region where the acid catalyst is generated, post-exposure heat treatment: Post Exposure Bake (hereinafter also referred to as “PEB”) can be performed. PEB can promote the formation of a carboxyl group or a phenolic hydroxyl group from an acid-decomposable group. The temperature for performing PEB is preferably 30 ° C. or higher and 130 ° C. or lower, more preferably 40 ° C. or higher and 110 ° C. or lower, and particularly preferably 50 ° C. or higher and 100 ° C. or lower.
However, since the acid-decomposable group in the present invention has low activation energy for acid decomposition and is easily decomposed by an acid derived from an acid generator by exposure to generate a carboxyl group or a phenolic hydroxyl group, PEB is not necessarily performed. A positive image can also be formed by development.

In the developing step (4), a copolymer having a liberated carboxyl group or phenolic hydroxyl group is developed using an alkaline developer. A positive image is formed by removing an exposed area containing a resin composition having a carboxyl group or a phenolic hydroxyl group that is easily dissolved in an alkaline developer.
The developer used in the development step preferably contains a basic compound. Examples of the basic compound include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; alkalis such as sodium bicarbonate and potassium bicarbonate Metal bicarbonates; ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline hydroxide; aqueous solutions such as sodium silicate and sodium metasilicate can be used. In addition, an aqueous solution obtained by adding an appropriate amount of a water-soluble organic solvent such as methanol or ethanol or a surfactant to the alkaline aqueous solution may be used as a developer.
Preferred examples of the developer include 0.4% aqueous solution, 0.5% aqueous solution, 0.7% aqueous solution and 2.38% aqueous solution of tetraethylammonium hydroxide.
The pH of the developer is preferably 10.0 to 14.0.
The development time is preferably 30 to 500 seconds, and the development method may be any of a liquid piling method (paddle method), a shower method, a dipping method, and the like.
A rinsing step can also be performed after development. In the rinsing step, the developed substrate and the development residue are removed by washing the developed substrate with pure water or the like. A known method can be used as the rinsing method. For example, shower rinse and dip rinse can be mentioned.

In the post-baking step of (5), by heating the obtained positive image, the acid-decomposable group is thermally decomposed to generate a carboxyl group or a phenolic hydroxyl group, and then crosslinked with a crosslinkable group, a crosslinking agent or the like. A cured film can be formed. This heating is performed using a heating device such as a hot plate or an oven at a predetermined temperature, for example, 180 to 250 ° C. for a predetermined time, for example, 5 to 90 minutes on a hot plate, 30 to 120 minutes for an oven. It is preferable to By proceeding the crosslinking reaction in this way, a protective film and an interlayer insulating film that are superior in heat resistance, hardness, and the like can be formed. In addition, when the heat treatment is performed in a nitrogen atmosphere, the transparency can be further improved.
Prior to post-baking, post-baking can be performed after baking at a relatively low temperature (addition of a middle baking process). When performing middle baking, it is preferable to post-bake at a high temperature of 200 ° C. or higher after heating at 90 to 150 ° C. for 1 to 60 minutes. Moreover, middle baking and post-baking can be heated in three or more stages. The taper angle of the pattern can be adjusted by devising such middle baking and post baking. These heating methods can use well-known heating methods, such as a hotplate, oven, and an infrared heater.
Prior to post-baking, the entire surface of the patterned substrate was re-exposed with actinic rays (post-exposure), and then post-baked to generate an acid from the photoacid generator present in the unexposed portion, thereby performing a crosslinking step. It can function as a catalyst to promote, and can accelerate the curing reaction of the film. As a preferable exposure amount when the post-exposure step is included, 100 to 3,000 mJ / cm ² is preferable, and 100 to 500 mJ / cm ² is particularly preferable.

  Furthermore, the cured film obtained from the photosensitive resin composition of the present invention can also be used as a dry etching resist. In the case where a cured film obtained by thermal curing in a post-baking process is used as a dry etching resist, dry etching processes such as ashing, plasma etching, and ozone etching can be performed as the etching process.

[Curing film]
The cured film of the present invention is a cured film obtained by curing the photosensitive resin composition of the present invention.
The cured film of the present invention can be suitably used as an interlayer insulating film. Moreover, it is preferable that the cured film of this invention is a cured film obtained by the formation method of the cured film of this invention.
With the photosensitive resin composition of the present invention, an interlayer insulating film having excellent insulation and high transparency even when baked at high temperatures can be obtained.
[Display device]
The interlayer insulating film using the photosensitive resin composition of the present invention has high transparency and is excellent in cured film properties, so that it is useful for applications of display devices (preferably liquid crystal display devices and organic EL display devices). is there.

[Liquid Crystal Display]
The liquid crystal display device of the present invention comprises the cured film of the present invention.
The liquid crystal display device of the present invention is not particularly limited except that it has a flattening film and an interlayer insulating film formed using the photosensitive resin composition of the present invention, and known liquid crystal displays having various structures. An apparatus can be mentioned.
For example, specific examples of TFT (Thin-Film Transistor) included in the liquid crystal display device of the present invention include amorphous silicon-TFT, low-temperature polysilicon-TFT, oxide semiconductor TFT, and the like. Since the cured film of the present invention is excellent in electrical characteristics, it can be preferably used in combination with these TFTs.
In addition, as a liquid crystal driving method that the liquid crystal display device of the present invention can take, a TN (Twisted Nematic) method, a VA (Virtual Alignment) method, an IPS (In-Place-Switching) method, an FFS (Frings Field).
Examples thereof include a switching method and an OCB (Optical Compensated Bend) method.
In the panel configuration, the cured film of the present invention can also be used in a COA (Color Filter on Array) type liquid crystal display device. For example, the organic insulating film (115) of JP-A-2005-284291, -346054 can be used as the organic insulating film (212).
Specific examples of the alignment method of the liquid crystal alignment film that can be taken by the liquid crystal display device of the present invention include a rubbing alignment method and a photo alignment method. Further, the polymer orientation may be supported by a PSA (Polymer Sustained Alignment) technique described in JP-A Nos. 2003-149647 and 2011-257734.
Moreover, the photosensitive resin composition of this invention and the cured film of this invention are not limited to the said use, but can be used for various uses. For example, in addition to the planarization film and interlayer insulating film, a protective film for the color filter, a spacer for keeping the thickness of the liquid crystal layer in the liquid crystal display device constant, a microlens provided on the color filter in the solid-state imaging device, etc. Can be suitably used.
FIG. 2 is a conceptual cross-sectional view showing an example of the active matrix type liquid crystal display device 10. The color liquid crystal display device 10 is a liquid crystal panel having a backlight unit 12 on the back surface, and the liquid crystal panel includes all pixels disposed between two glass substrates 14 and 15 having a polarizing film attached thereto. The elements of the TFT 16 corresponding to are arranged. Each element formed on the glass substrate is wired with an ITO transparent electrode 19 that forms a pixel electrode through a contact hole 18 formed in the cured film 17. On the ITO transparent electrode 19, an RGB color filter 22 in which a liquid crystal 20 layer and a black matrix are arranged is provided.
The light source of the backlight is not particularly limited, and a known light source can be used. For example, a white LED, a multicolor LED such as blue, red, and green, a fluorescent lamp (cold cathode tube), and an organic EL can be used.
Further, the liquid crystal display device can be a 3D (stereoscopic) type or a touch panel type. Further, it can be made flexible, and can be used as the second interlayer insulating film (48) of JP2011-145686A or the interlayer insulating film (520) of JP2009-258758A.

[Organic EL display device]
The organic EL display device of the present invention comprises the cured film of the present invention.
The organic EL display device of the present invention is not particularly limited except that it has a flattening film and an interlayer insulating film formed using the photosensitive resin composition of the present invention, and various known structures having various structures. Examples thereof include an organic EL display device and a liquid crystal display device.
For example, specific examples of TFT (Thin-Film Transistor) included in the organic EL display device of the present invention include amorphous silicon-TFT, low-temperature polysilicon-TFT, oxide semiconductor TFT, and the like. Since the cured film of the present invention is excellent in electrical characteristics, it can be preferably used in combination with these TFTs.
FIG. 1 is a conceptual diagram of an example of an organic EL display device. A schematic cross-sectional view of a substrate in a bottom emission type organic EL display device is shown, and a planarizing film 4 is provided.
A bottom gate type TFT 1 is formed on a glass substrate 6, and an insulating film 3 made of Si ₃ N ₄ is formed so as to cover the TFT 1. A contact hole (not shown) is formed in the insulating film 3, and then a wiring 2 (height: 1.0 μm) connected to the TFT 1 through the contact hole is formed on the insulating film 3. The wiring 2 is used to connect the TFT 1 to the organic EL element formed between the TFTs 1 or in a later process.
Further, in order to flatten the unevenness due to the formation of the wiring 2, the flattening film 4 is formed on the insulating film 3 with the unevenness due to the wiring 2 being embedded.
On the planarizing film 4, a bottom emission type organic EL element is formed. That is, the first electrode 5 made of ITO is formed on the planarizing film 4 so as to be connected to the wiring 2 through the contact hole 7. The first electrode 5 corresponds to the anode of the organic EL element.
An insulating film 8 having a shape covering the periphery of the first electrode 5 is formed. By providing the insulating film 8, a short circuit between the first electrode 5 and the second electrode formed in the subsequent process is prevented. can do.
Further, although not shown in FIG. 2, a hole transport layer, an organic light emitting layer, and an electron transport layer are sequentially deposited through a desired pattern mask, and then a second layer made of Al is formed on the entire surface above the substrate. An active matrix organic material in which two electrodes are formed and sealed by bonding using a sealing glass plate and an ultraviolet curable epoxy resin, and each organic EL element is connected to a TFT 1 for driving it. An EL display device is obtained.

  Since the photosensitive resin composition of the present invention is excellent in curability and cured film characteristics, a resist pattern formed using the photosensitive resin composition of the present invention as a structural member of a MEMS device can be used as a partition wall or mechanically driven. Used as part of the part. Examples of such MEMS devices include parts such as SAW filters, BAW filters, gyro sensors, display micro shutters, image sensors, electronic paper, inkjet heads, biochips, sealants, and the like. More specific examples are exemplified in JP-T-2007-522531, JP-A-2008-250200, JP-A-2009-263544, and the like.

  Since the photosensitive resin composition of the present invention is excellent in flatness and transparency, for example, the bank layer (16) and the planarization film (57) described in FIG. 2 of JP-A-2011-107476, JP-A-2010- The partition wall (12) and the planarization film (102) described in FIG. 4A of 9793, and the bank layer (221) and third interlayer insulating film (216b) described in FIG. 10 of JP 2010-27591A. ), Second interlayer insulating film (125) and third interlayer insulating film (126) described in FIG. 4A of JP-A-2009-128577, and flatness described in FIG. 3 of JP-A-2010-182638. It can also be used to form a chemical film (12) and a pixel isolation insulating film (14).

  The present invention will be described more specifically with reference to the following examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention is not limited to the specific examples shown below. Unless otherwise specified, “part” and “%” are based on mass.

In the following synthesis examples, the following symbols represent the following compounds, respectively.
MATHF: 2-tetrahydrofuranyl methacrylate (synthetic product)
MAEVE: 1-ethoxyethyl methacrylate (synthetic product)
MACHOE: 1- (cyclohexyloxy) ethyl methacrylate (synthetic product)
MATHP: tetrahydro-2H-pyran-2-yl methacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd.)
PHSEVE: 4- (1-ethoxyethyloxy) styrene (synthetic product)
PHSTHF: (Synthetic product)
GMA: Glycidyl methacrylate (manufactured by Wako Pure Chemical Industries, Ltd.)
OXE-30: 3-ethyl-3-oxetanylmethyl methacrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd.)
NBMA: n-butoxymethylacrylamide (manufactured by Tokyo Chemical Industry) MAA: methacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd.)
MAA: Methacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd.)
MMA: Methyl methacrylate (Wako Pure Chemical Industries, Ltd.)
St: Styrene (Wako Pure Chemical Industries, Ltd.)
DCPM: Dicyclopentanyl methacrylate (manufactured by Hitachi Chemical Co., Ltd.)
1,3-butadiene (manufactured by Tokyo Chemical Industry Co., Ltd.)
2-Trifluoromethyl-1,3-butadiene (manufactured by Tokyo Chemical Industry Co., Ltd.)
2-methyl-1,3-butadiene (manufactured by Tokyo Chemical Industry Co., Ltd.)
2,3-dimethyl-1,3-butadiene (manufactured by Tokyo Chemical Industry Co., Ltd.)
2,3-diol-1,3-butadiene (manufactured by Tokyo Chemical Industry Co., Ltd.)
V-601: Dimethyl 2,2′-azobis (2-methylpropionate) (manufactured by Wako Pure Chemical Industries, Ltd.)
V-65: 2,2′-azobis (2,4-dimethylvaleronitrile) (manufactured by Wako Pure Chemical Industries, Ltd.)
MEDG (diethylene glycol ethyl methyl ether): Hisolv EDM (manufactured by Toho Chemical Industry Co., Ltd.)
PGMEA (propylene glycol monomethyl ether acetate): (Showa Denko)

<Synthesis of MATHF>
Methacrylic acid (86 g, 1 mol) was cooled to 15 ° C., and camphorsulfonic acid (4.6 g, 0.02 mol) was added. To the solution, 2-dihydrofuran (71 g, 1 mol, 1.0 equivalent) was added dropwise. After stirring for 1 hour, saturated sodium bicarbonate (500 mL) was added, extracted with ethyl acetate (500 mL), dried over magnesium sulfate, insolubles were filtered and concentrated under reduced pressure at 40 ° C. or lower to give a residual yellow oily product. Distillation under reduced pressure afforded 125 g of tetrahydro-2H-furan-2-yl methacrylate (MATHF) as a colorless oily substance (yield 80%) at a boiling point (bp.) Of 54 to 56 ° C./3.5 mmHg.

<Synthesis of MAEVE>
To 144.2 parts (2 molar equivalents) of ethyl vinyl ether, 0.5 part of phenothiazine was added, and 86.1 parts (1 molar equivalent) of methacrylic acid was added dropwise while cooling the reaction system to 10 ° C. or lower. ) For 4 hours. After adding 5.0 parts of pyridinium p-toluenesulfonate, the mixture was stirred at room temperature for 2 hours and allowed to stand overnight at room temperature. To the reaction solution, 5 parts of sodium bicarbonate and 5 parts of sodium sulfate were added, and the mixture was stirred at room temperature for 1 hour. .) 134.0 parts of 1-ethoxyethyl methacrylate in the 43-45 ° C./7 mmHg fraction were obtained as a colorless oil.

<Synthesis of PHSEVE>
PHSEVE was synthesized by changing methacrylic acid in the MAEVE synthesis method to 4-hydroxystyrene.
<Synthesis of MACHOE>
MACHOE was synthesized by changing 2-dihydrofuran to 2-dihydropyran in the synthesis of MATHF.
<Synthesis of PHSTHF>
PHSTHF was synthesized by changing methacrylic acid in the MATHF synthesis method to 4-hydroxystyrene.

<Synthesis Example of Polymer P-1>
MEDG (89 g) was placed in a three-necked flask and heated to 90 ° C. in a nitrogen atmosphere. MAA (amount to be 12 mol% in all monomer components), MATHF (amount to be 28 mol% in all monomer components), 1,3-butadiene (60 mol% in all monomer components) V-65 (corresponding to 4 mol% with respect to 100 mol% in total of all monomer components) was dissolved and added dropwise over 2 hours. After completion of the dropwise addition, the mixture was stirred for 2 hours to complete the reaction. Thereby, polymer P-1 was obtained.
The weight average molecular weight measured by gel permeation chromatography (GPC) of the obtained polymer P-1 was 15,000.
<Synthesis Example of Polymers P-2 to P-23 and P′-1 to P′-8>
Other polymers were synthesized in the same manner as the synthesis of the polymer P-1, except that the monomers used and the amounts used were changed to those shown in the following table.

  In the table, the numerical values not particularly given in the table are in mol%. The numerical value of a polymerization initiator and an additive is mol% when a monomer component is 100 mol%. The solid content concentration is shown as monomer mass / (monomer mass + solvent mass) × 100 (unit: mass%). When V-601 was used as the polymerization initiator, the reaction temperature was 90 ° C., and when V-65 was used, the reaction temperature was 70 ° C.

<Preparation of photosensitive resin composition>
The polymer, photoacid generator, alkoxysilane compound, basic compound, surfactant and other components in the solvent (MEDG) so that the solid content ratio shown in the following table is obtained until the solid content concentration becomes 40% by mass. It melt-mixed and filtered with the filter made from a polytetrafluoroethylene with an aperture of 0.2 micrometer, The photosensitive resin composition of various Examples and comparative examples was obtained.

The details of the abbreviations indicating the compounds used in Examples and Comparative Examples are as follows.
P-1 to P-23, P′-1 to P′-8: polymers synthesized according to the above synthesis examples

(Photoacid generator)
B-1: Compound having the following structure (synthetic product)
B-2: Compound having the following structure (synthetic product)

B-3: Compound having the following structure (synthesized according to the method described in paragraph 0108 of JP-T-2002-528451)
B-4: PAG-103 (structure shown below, manufactured by BASF)

<Synthesis of B-1>
Aluminum chloride (10.6 g) and 2-chloropropionyl chloride (10.1 g) were added to a suspension of 2-naphthol (10 g) and chlorobenzene (30 mL), and the mixture was heated to 40 ° C. for 2 hours. I let you. Under ice-cooling, 4N HCl aqueous solution (60 mL) was added dropwise to the reaction solution, and ethyl acetate (50 mL) was added for liquid separation. Potassium carbonate (19.2 g) was added to the organic layer, reacted at 40 ° C. for 1 hour, 2N HCl aqueous solution (60 mL) was added and separated, and the organic layer was concentrated, and the crystals were diluted with diisopropyl ether (10 mL). The slurry was reslurried, filtered and dried to obtain a ketone compound (6.5 g).
Acetic acid (7.3 g) and a 50 mass% aqueous hydroxylamine solution (8.0 g) were added to a suspension of the obtained ketone compound (3.0 g) and methanol (30 mL), and the mixture was heated to reflux. After allowing to cool, water (50 mL) was added, and the precipitated crystals were filtered, washed with cold methanol, and dried to obtain an oxime compound (2.4 g).
The obtained oxime compound (1.8 g) was dissolved in acetone (20 mL), triethylamine (1.5 g) and p-toluenesulfonyl chloride (2.4 g) were added under ice cooling, and the temperature was raised to room temperature. Reacted for hours. Water (50 mL) was added to the reaction solution, and the precipitated crystals were filtered, then reslurried with methanol (20 mL), filtered and dried to obtain the compound of B-1 (the above structure) (2.3 g).
The ¹ H-NMR spectrum (300 MHz, CDCl ₃ ) of B-1 is δ = 8.3 (d, 1H), 8.0 (d, 2H), 7.9 (d, 1H), 7. 8 (d, 1H), 7.6 (dd, 1H), 7.4 (dd, 1H) 7.3 (d, 2H), 7.1 (d.1H), 5.6 (q, 1H) , 2.4 (s, 3H), 1.7 (d, 3H).

<Synthesis of B-2>
3.0 g of 2-amino-1-naphthol hydrochloride (manufactured by Tokyo Chemical Industry) and 8.7 g of methyl 4,4-dimethyl-3-oxovalerate (manufactured by Wako Pure Chemical Industries, Ltd.) were mixed, and p-toluenesulfonic acid monohydrate was mixed. 0.5 g (Wako Pure Chemical Industries, Ltd.) was added and heated at 120 ° C. for 2 hours under a nitrogen atmosphere. After allowing to cool, the crude product was purified by silica gel column chromatography to obtain 4.4 g of Intermediate B-2A.
B-2A (2.0 g) and p-xylene (10 mL) were mixed, 0.3 g of p-toluenesulfonic acid monohydrate (manufactured by Wako Pure Chemical Industries, Ltd.) was added, and the mixture was heated at 140 ° C. for 6 hours. After allowing to cool, water and ethyl acetate were added to the reaction mixture and the phases were separated. The organic phase was dried over magnesium sulfate, filtered and concentrated to obtain crude B-2B.
THF (1.5 mL) and crude B-2B total amount were mixed, 8.5 mL of 2M hydrochloric acid / THF solution and then isopentyl nitrite (manufactured by Wako Pure Chemical Industries, Ltd.) (1.2 g) were added dropwise under ice cooling, and the mixture was allowed to rise to room temperature. The mixture was stirred for 2 hours after warming. Water and ethyl acetate were added to the obtained reaction mixture for liquid separation, and the organic layer was washed with water, dried over magnesium sulfate, filtered and concentrated to obtain Intermediate Intermediate B-2C.
Intermediate crude B-2C (1.0 g) was mixed with acetone (10 mL), and triethylamine (manufactured by Wako Pure Chemical Industries, Ltd.) (0.74 g) and p-toluenesulfonyl chloride (manufactured by Tokyo Chemical Industry) (1. 0 g) was added, and the mixture was warmed to room temperature and stirred for 1 hour. Water and ethyl acetate were added to the obtained reaction mixture for liquid separation, and the organic phase was dried over magnesium sulfate, filtered and concentrated to obtain crude B-2. Crude B-2 was reslurried with methanol, filtered and dried to obtain B-2 (1.0 g).

(Alkoxysilane compound)
E-1: γ-glycidoxypropyltrialkoxysilane (KBM-403: manufactured by Shin-Etsu Chemical Co., Ltd.)

(Basic compound)
H-1: Compound having the following structure

(Surfactant)
I-1: Perfluoroalkyl group-containing nonionic surfactant represented by the following structural formula (F-554, manufactured by DIC)

<Evaluation of relative dielectric constant>
Each photosensitive resin composition was spin-coated on a bare wafer substrate (N-type low resistance) (manufactured by SUMCO), and then pre-baked on a hot plate at 90 ° C. for 120 seconds to volatilize the solvent, and a photosensitive film having a thickness of 3.0 μm. A functional resin composition layer was formed. Subsequently, using an ultra-high pressure mercury lamp, exposure was performed so that the integrated irradiation amount was 300 mJ / cm ² (energy intensity: 20 mW / cm ² , i-line), and this substrate was heated in an oven at 230 ° C./30 minutes, Furthermore, it heated at 230 degreeC / 2 hours in oven.
With respect to this cured film, the relative dielectric constant was measured at a measurement frequency of 1 MHz using CVmap92A (made by Four Dimensions Inc.). The results are shown in the following table. The smaller the numerical value, the better, and A to C are preferable.
A: Less than 3.0 B: 3.0 or more and less than 3.3 C: 3.3 or more and less than 3.7 D: 3.7 or more and less than 4.0 E: 4.0 or more

<Evaluation of hygroscopicity>
Each photosensitive resin composition was spin-coated on a polyimide film, and then pre-baked on a hot plate at 90 ° C. for 120 seconds to volatilize the solvent, thereby forming a photosensitive resin composition layer having a thickness of 3.0 μm. Subsequently, using an ultra-high pressure mercury lamp, exposure was performed so that the integrated irradiation amount was 300 mJ / cm ² (energy intensity: 20 mW / cm ² , i-line), and this substrate was heated in an oven at 230 ° C./30 minutes, Furthermore, it heated at 230 degreeC / 2 hours in oven.
About this cured film, the water vapor transmission rate was evaluated using the LYSSY water vapor permeability meter (made by Systech Instruments).
The results are shown in the following table. A to C are preferred.
A: Less than 1 g / m ² · day B: 1 g / m ² · day or more, less than 5 g / m ² · day C: 5 g / m ² · day or more, less than 10 g / m ² · day D: 10 g / m ² · day or more Less than 50 g / m ² · day E: 50 g / m ² · day or more

<Evaluation of sensitivity>
A glass substrate (EAGLE XG, 0.7 mm thickness (manufactured by Corning)) was exposed to hexamethyldisilazane (HMDS) vapor for 30 seconds, and each photosensitive resin composition was spin-coated, and then heated at 90 ° C./120 seconds. Pre-baked on the plate to volatilize the solvent to form a photosensitive resin composition layer having a thickness of 3.0 μm.
Next, the obtained photosensitive resin composition layer was exposed through a predetermined mask using MPA 5500CF (high pressure mercury lamp) manufactured by Canon Inc. The exposed photosensitive resin composition layer was developed with an alkali developer (0.4% tetramethylammonium hydroxide aqueous solution) at 23 ° C./60 seconds, and then rinsed with ultrapure water for 20 seconds. The optimum i-line exposure (Eopt) when resolving a 5 μm hole by these operations was taken as the sensitivity.
A: 20mJ / cm ² less B: 20mJ / cm ² or more, 40 mJ / cm ² less than C: 40mJ / cm ² or more, 80 mJ / cm ² less than D: 80mJ / cm ² or more, 160 mJ / cm ² less than E: 160 mJ / cm ² or more

<Curing film adhesion>
Each photosensitive resin composition was spin-coated on a glass substrate on which a Mo (molybdenum) thin film was formed, and then pre-baked on a hot plate at 90 ° C. for 120 seconds to volatilize the solvent. A photosensitive resin composition layer was formed. Subsequently, exposure is performed using an ultra-high pressure mercury lamp so that the integrated irradiation amount is 300 mJ / cm ² (energy intensity: 20 mW / cm ² , i-line), and then the substrate is heated in an oven at 230 ° C./30 minutes. Thus, a cured film was obtained.
Next, the cured film was cut using a cutter at intervals of 1 mm vertically and horizontally, and a tape peeling test (100 mask loss cut method: conforming to JIS 5600) was performed using a scotch tape. The adhesion between the cured film and the substrate was evaluated from the area of the cured film transferred to the back surface of the tape. The results are shown in the following table. The smaller the numerical value, the higher the adhesion to the base substrate, and A or B is a practical level.
A: The transferred area is less than 1% B: The transferred area is 1% or more and less than 5% C: The transferred area is 5% or more and less than 10% D: The transferred area is 10% or more and less than 50% E : The transferred area is 50% or more

  As apparent from the results, a cured film having a low dielectric constant and low hygroscopicity could be obtained while maintaining high sensitivity by using the photosensitive resin composition of the present invention. Moreover, when the photosensitive resin composition of the present invention is used as a cured film by containing 40 mol% or less of the structural unit (a4) in all the structural units of the polymer component (A) of the photosensitive resin composition. The adhesion between the cured film and the substrate could be further improved.

<Example 32>
Example 32 was performed in the same manner as in Example 1 except that the exposure machine was changed from MPA 5500CF manufactured by Canon Inc. to FX-803M (gh-Line stepper) manufactured by Nikon Corporation. The evaluation of sensitivity was the same level as in Example 1.

<Example 33>
Example 33 was performed in the same manner as in Example 1 except that the exposure machine was changed from MPA 5500CF manufactured by Canon Inc. to a 355 nm laser exposure machine and 355 nm laser exposure was performed. Here, as the 355 nm laser exposure machine, “AEGIS” manufactured by Buoy Technology Co., Ltd. was used (wavelength 355 nm, pulse width 6 nsec), and the exposure amount was measured using “PE10B-V2” manufactured by OPHIR.
The evaluation of sensitivity was the same level as in Example 1.

<Example 34>
In the active matrix liquid crystal display device described in FIG. 1 of Japanese Patent No. 3321003, a cured film 17 was formed as an interlayer insulating film as follows, and a liquid crystal display device of Example 34 was obtained. That is, using the photosensitive resin composition of Example 1, a cured film 17 was formed as an interlayer insulating film.
That is, as a pretreatment for improving the wettability between the substrate and the interlayer insulating film 17 in paragraph 58 of Japanese Patent No. 3321003, the substrate is exposed to hexamethyldisilazane (HMDS) vapor for 30 seconds, and then the photosensitive material of Example 1 is used. After spin-coating the photosensitive resin composition, it was pre-baked on a hot plate at 90 ° C. for 2 minutes to volatilize the solvent, thereby forming a photosensitive resin composition layer having a thickness of 3 μm. Next, the obtained photosensitive resin composition layer was subjected to 40 mJ / cm ² (energy intensity: 20 mW / cm ² ) through a hole pattern mask of 10 μmφ using MPA 5500CF (high pressure mercury lamp) manufactured by Canon Inc. , I-line). The exposed photosensitive resin composition layer was subjected to paddle development at 23 ° C./60 seconds with an alkaline developer (0.4% tetramethylammonium hydroxide aqueous solution), and then rinsed with ultrapure water for 20 seconds. Subsequently, the whole surface was exposed using an ultra-high pressure mercury lamp so that the integrated irradiation amount was 300 mJ / cm ² (energy intensity: 20 mW / cm ² , i-line), and then the substrate was heated in an oven at 230 ° C. for 30 minutes. Thus, a cured film was obtained.
The applicability when applying the photosensitive resin composition was good, and no wrinkles or cracks were observed in the cured film obtained after exposure, development, and baking.

  When a driving voltage was applied to the obtained liquid crystal display device, it was found that the liquid crystal display device showed good display characteristics and high reliability.

<Example 35>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even when the photosensitive resin composition of Example 1 was applied without the hexamethyldisilazane (HMDS) treatment, which is a pretreatment of the substrate, the resulting cured film was good with no chipping or peeling off of the pattern. It was a state. Further, the performance as a liquid crystal display device was as good as in Example 34. This is presumably because the composition of the present invention has excellent adhesion to the substrate. From the viewpoint of improving productivity, it is also preferable to omit the substrate pretreatment step.

<Example 36>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even if a vacuum drying step (VCD) was introduced after pre-baking, the obtained cured film was in a good state with no pattern chipping or peeling. Further, the performance as a liquid crystal display device was as good as in Example 34. It is also preferable to introduce a reduced-pressure drying step from the viewpoint of suppressing coating unevenness according to the solid content concentration and the film thickness of the composition.

<Example 37>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even if the PEB process was introduced between the development process and the mask exposure, the obtained cured film was in a good state with no pattern chipping or peeling. Further, the performance as a liquid crystal display device was as good as in Example 34. From the viewpoint of improving dimensional stability, it is also preferable to introduce a PEB process.

<Example 38>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even when the alkaline developer is changed from a 0.4% tetramethylammonium hydroxide aqueous solution to a 2.38% tetramethylammonium hydroxide aqueous solution, the resulting cured film has good pattern free of chipping and peeling. It was a state. Further, the performance as a liquid crystal display device was as good as in Example 34. This is presumably because the composition of the present invention has excellent adhesion to the substrate.

<Example 39>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even when the alkali development method was changed from paddle development to shower development, the obtained cured film was in a good state with no pattern chipping or peeling. Further, the performance as a liquid crystal display device was as good as in Example 34. This is presumably because the composition of the present invention has excellent adhesion to the substrate.

<Example 40>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, even when the alkaline developer was changed from a 0.4% tetramethylammonium hydroxide aqueous solution to a 0.04% KOH aqueous solution, the resulting cured film was in a good state with no pattern chipping or peeling. It was. Further, the performance as a liquid crystal display device was as good as in Example 34. This is presumably because the composition of the present invention has excellent adhesion to the substrate.

<Example 41>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, the entire surface exposure step after development and rinsing was omitted, and the cured film was obtained by heating in an oven at 230 ° C. for 30 minutes. The performance of the obtained liquid crystal display device was as good as in Example 34. This seems to be because the composition of the present invention is excellent in chemical resistance. From the viewpoint of improving productivity, it is also preferable to omit the entire exposure process.

<Example 42>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, a step of heating on a hot plate at 100 ° C. for 3 minutes was added between the entire surface exposure step and the 230 ° C./30 minute heating step in the oven. The performance of the obtained liquid crystal display device was as good as in Example 34. It is also preferable to add this process from the viewpoint of adjusting the shape of the hole pattern.

<Example 43>
A liquid crystal display device similar to that of Example 34 was changed to obtain the same liquid crystal display device. That is, a process of heating on a hot plate at 100 ° C. for 3 minutes was added between the development / rinse process and the entire surface exposure process. The performance of the obtained liquid crystal display device was as good as in Example 32. It is also preferable to add this process from the viewpoint of adjusting the shape of the hole pattern.

An organic EL display device using a thin film transistor (TFT) was produced by the following method (see FIG. 1).
A bottom gate type TFT 1 was formed on a glass substrate 6, and an insulating film 3 made of Si ₃ N ₄ was formed so as to cover the TFT 1. Next, a contact hole (not shown) is formed in the insulating film 3, and then a wiring 2 (height 1.0 μm) connected to the TFT 1 through the contact hole is formed on the insulating film 3. . The wiring 2 is used to connect the TFT 1 with an organic EL element formed between TFTs 1 or in a later process.

Further, in order to flatten the unevenness due to the formation of the wiring 2, the planarizing film 4 was formed on the insulating film 3 in a state where the unevenness due to the wiring 2 was embedded. The planarizing film 4 is formed on the insulating film 3 by spin-coating the photosensitive resin composition of Example 1 on a substrate, pre-baking (90 ° C./120 seconds) on a hot plate, and then applying high pressure from above the mask. After irradiation with i-line (365 nm) at 45 mJ / cm ² (energy intensity 20 mW / cm ² ) using a mercury lamp, development is performed with an alkaline aqueous solution (0.4% TMAH aqueous solution) to form a pattern. Was used to expose the entire surface so that the integrated dose was 300 mJ / cm ² (energy intensity: 20 mW / cm ² , i-line), and a heat treatment was performed at 230 ° C./30 minutes.
The applicability when applying the photosensitive resin composition was good, and no wrinkles or cracks were observed in the cured film obtained after exposure, development and baking. Furthermore, the average step of the wiring 2 was 500 nm, and the thickness of the prepared planarizing film 4 was 2,000 nm.

  Next, a bottom emission type organic EL element was formed on the obtained planarization film 4. First, a first electrode 5 made of ITO was formed on the planarizing film 4 so as to be connected to the wiring 2 through the contact hole 7. Thereafter, a resist was applied, prebaked, exposed through a mask having a desired pattern, and developed. Using this resist pattern as a mask, pattern processing was performed by wet etching using an ITO etchant. Thereafter, the resist pattern was stripped at 50 ° C. using a resist stripper (remover 100, manufactured by AZ Electronic Materials). The first electrode 5 thus obtained corresponds to the anode of the organic EL element.

  Next, an insulating film 8 having a shape covering the periphery of the first electrode 5 was formed. As the insulating film 8, the photosensitive resin composition of Example 1 was used, and the insulating film 8 was formed by the same method as described above. By providing this insulating film 8, it is possible to prevent a short circuit between the first electrode 5 and the second electrode formed in the subsequent process.

  Furthermore, a hole transport layer, an organic light emitting layer, and an electron transport layer were sequentially deposited through a desired pattern mask in a vacuum deposition apparatus. Next, a second electrode made of Al was formed on the entire surface above the substrate. The obtained board | substrate was taken out from the vapor deposition machine, and it sealed by bonding together using the glass plate for sealing, and an ultraviolet curable epoxy resin.

  As described above, an active matrix type organic EL display device in which each organic EL element is connected to the TFT 1 for driving the organic EL element was obtained. When a voltage was applied via the drive circuit, it was found that the organic EL display device showed good display characteristics and high reliability.

1: TFT (Thin Film Transistor)
2: Wiring 3: Insulating film 4: Flattened film 5: First electrode 6: Glass substrate 7: Contact hole 8: Insulating film 10: Liquid crystal display device 12: Backlight unit 14, 15: Glass substrate 16: TFT
17: Cured film 18: Contact hole 19: ITO transparent electrode 20: Liquid crystal 22: Color filter

Claims (12)

(A) a polymer component containing a polymer that satisfies at least one of the following (A1) and (A2):
(A1) (a1) a polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a structural unit represented by the following general formula (S):
(A2) (a1) a polymer having a structural unit having a residue in which an acid group is protected with an acid-decomposable group, and (a4) a polymer having a structural unit represented by the following general formula (S):
(B) contains a photoacid generator, and (C) a solvent,
The photosensitive resin composition in which the (A) polymer component contains (a2) a structural unit having a crosslinkable group.
(In formula (S), R ¹ and R ² each represent a hydrogen atom, an unsubstituted alkyl group having 1 to 3 carbon atoms, or a perfluoroalkyl group having 1 to 3 carbon atoms.) The photosensitive resin composition of Claim 1 whose ratio of said (a4) is 5-70 mol% among said (A) polymer components. The photosensitive resin composition of Claim 1 whose ratio of said (a4) is 15-50 mol% among said (A) polymer components. (A2) a structural unit having a crosslinkable group is an epoxy group, an oxetanyl group, a group represented by —NH—CH ₂ —O—R (R is a hydrogen atom or an alkyl group having 1 to 20 carbon atoms) and ethylenic group The photosensitive resin composition of any one of Claims 1-3 containing the structural unit containing at least 1 chosen from the group which consists of an unsaturated group. The said (B) photo-acid generator is an oxime sulfonate type | system | group acid generator represented by either of the following general formula (B2), (B3), and (B4), The any one of Claims 1-4. The photosensitive resin composition as described in 2.
General formula (B2)
(In the formula (B2), R ⁴² represents an alkyl group or an aryl group, X represents an alkyl group, an alkoxy group, or a halogen atom, m4 represents an integer of 0 to 3, and m4 represents 2 or When X is 3, the plurality of X may be the same or different.)
General formula (B3)
(In the formula (B3), R ⁴³ represents an alkyl group or an aryl group, and X ¹ represents a halogen atom, a hydroxyl group, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, or a nitro group. Represents a group, and n4 represents an integer of 0 to 5.)
(In Formula (B4), R ¹ represents an alkyl group or an aryl group, R ² represents an alkyl group, an aryl group, or a heteroaryl group. R ^{3 to} R ⁶ represent a hydrogen atom or an alkyl group, respectively. Represents an aryl group or a halogen atom, provided that R ³ and R ⁴ , R ⁴ and R ⁵ , or R ⁵ and R ⁶ may combine to form an alicyclic ring or aromatic ring, and X represents —O -Represents -S-) In any one of Claims 1-5 which has a structural unit represented by the following general formula (a1-1-3) as a structural unit in which the said acid group has the residue protected by the acid-decomposable group. The photosensitive resin composition as described.
General formula (a1-1-3)
(In formula (a1-1-3), R ¹²¹ represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, L ¹ represents a carbonyl group or a phenylene group, and R ^{122 to} R ¹²⁸ each independently represents hydrogen. Represents an atom or an alkyl group having 1 to 4 carbon atoms.) (1) The process of apply | coating the photosensitive resin composition of any one of Claims 1-6 on a board | substrate,
(2) a step of removing the solvent from the applied photosensitive resin composition;
(3) A step of exposing the photosensitive resin composition from which the solvent has been removed with actinic rays,
(4) a step of developing the exposed photosensitive resin composition with an aqueous developer, and
(5) A method for producing a cured film, comprising a post-baking step of thermosetting the developed photosensitive resin composition. The manufacturing method of the cured film of Claim 7 including the process of exposing the developed photosensitive resin composition to the whole surface after the said image development process and before the said post-baking process. The cured film formed by hardening | curing the photosensitive resin composition of any one of Claims 1-6 . The cured film according to claim 9, which is an interlayer insulating film. An organic EL display device having the cured film according to claim 9. A liquid crystal display device having the cured film according to claim 9.