WO2009116618A1

WO2009116618A1 - Curable composition, anisotropic conductive material and connection structure

Info

Publication number: WO2009116618A1
Application number: PCT/JP2009/055414
Authority: WO
Inventors: 敬士久保田
Original assignee: 積水化学工業株式会社
Priority date: 2008-03-21
Filing date: 2009-03-19
Publication date: 2009-09-24
Also published as: JPWO2009116618A1; JP4472779B2; CN101970525A; TWI402286B; KR101538820B1; KR20100137424A; CN101970525B; TW200946555A

Abstract

Disclosed is a curable composition which enables formation of a cured product that has low linear expansion coefficient and is hardly separated from a circuit board, an electronic component or the like even when heated. The curable composition contains a component including at least one of an epoxy group and a thiirane group, and a curing agent. The component including at least one of an epoxy group and a thiirane group contains a monomer of a compound represented by formula (1), a multimer wherein at least two of the compounds are bonded together, or a mixture of the monomer and the multimer. In formula (1), R1 represents a hydrogen atom, an alkyl group having 1-5 carbon atoms or a structure represented by formula (2); R2 and R3 each represents an alkylene group having 1-5 carbon atoms; and X1 and X2 each represents an oxygen atom or a sulfur atom. In formula (2), R4 represents an alkylene group having 1-5 carbon atoms; and X3 represents an oxygen atom or a sulfur atom.

Description

Curable composition, anisotropic conductive material, and connection structure

The present invention relates to a curable composition, and more specifically, a curable composition having a low linear expansion coefficient and capable of obtaining a cured product that is difficult to peel off from a circuit board or an electronic component even when heated, and the cured product. The present invention relates to an anisotropic conductive material using a conductive composition and a connection structure.

Anisotropic conductive materials such as anisotropic conductive paste, anisotropic conductive ink, anisotropic conductive adhesive, anisotropic conductive film, or anisotropic conductive sheet are widely known.

An anisotropic conductive material is used for connection between an IC chip and a flexible printed circuit board, connection between an IC chip and a circuit board having an ITO electrode, and the like. For example, after an anisotropic conductive material is arranged between the electrode of the IC chip and the electrode of the circuit board, these electrodes can be connected by heating and pressurizing.

As an example of the anisotropic conductive material, the following Patent Document 1 includes an anisotropic containing a thermosetting insulating adhesive, conductive particles, an imidazole latent curing agent, and an amine latent curing agent. A conductive conductive adhesive film is disclosed. Patent Document 1 describes that the connection reliability is excellent even when this anisotropic conductive adhesive film is cured at a relatively low temperature.
JP-A-9-115335

Recently, in order to mount an IC chip on a flexible printed circuit board by reflow, solder balls having a spherical shape are used. By reflow, the solder balls mounted on the electrodes of the IC chip are melted and solidified, whereby the IC chip is mounted on the flexible printed circuit board. The reflow means “a soldering method in which an electronic component chip is arranged so that the electronic component chip provided with solder contacts the electrode of the substrate, and the solder is melted and solidified by heating”.

In reflow, not only the IC chip or the flexible printed circuit board but also the anisotropic conductive material used for the connection between the electrodes is heated. In particular, when a cured product of the anisotropic conductive material is heated, the cured product of the anisotropic conductive material may be peeled off from the IC chip or the flexible printed circuit board. Therefore, there is a strong demand for an anisotropic conductive material that does not easily peel off from an IC chip or a flexible printed circuit board even when heated.

In the anisotropic conductive adhesive film described in Patent Document 1, the heating temperature necessary to start curing is relatively low. However, there is a problem that the linear expansion coefficient of the cured product of the anisotropic conductive adhesive film is high. For this reason, when the circuit board connected using the said anisotropic conductive adhesive film is heated, the anisotropic conductive adhesive film may peel from a circuit board. Therefore, the connection reliability between the electrodes may be lowered.

In recent years, in order to efficiently connect the electrodes of the circuit board or the electronic component, it is required to lower the heating temperature required for the connection and to shorten the pressurizing time. Furthermore, since circuit boards or electronic components are easily deteriorated by heating, there is a strong demand for lowering the heating temperature.

In the anisotropic conductive adhesive film described in Patent Document 1, the heating temperature required to start curing is relatively low. However, in this anisotropic conductive adhesive film, the curing reaction may not sufficiently proceed at low temperatures. In order to securely connect the electrodes of the circuit board or the electronic component by using the anisotropic conductive adhesive film, it may be necessary to increase the heating temperature or to heat for a long time. Therefore, the electrodes may not be efficiently connected.

An object of the present invention is to provide a curable composition capable of obtaining a cured product having a low coefficient of linear expansion and difficult to peel from a circuit board or an electronic component even when heated, and an anisotropy using the curable composition It is to provide a conductive material and a connection structure.

Further, the limited object of the present invention is not only to obtain a cured product having a low coefficient of linear expansion, but also to be able to cure quickly at a low temperature, and when used for connection of a connection object member, It is providing the curable composition which can connect an object member efficiently, and the anisotropic conductive material and connection structure using this curable composition.

According to a wide aspect of the present invention, the component having at least one of an epoxy group and a thiirane group and a curing agent, and the component having at least one of the epoxy group and the thiirane group have the following formula ( A curable composition comprising a monomer having a structure represented by 1), a multimer in which at least two of the compounds are bonded, or a mixture of the monomer and the multimer is provided. .

In the above formula (1), R1 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a structure represented by the following formula (2), R2 represents an alkylene group having 1 to 5 carbon atoms, and R3 represents carbon X 1 represents an oxygen atom or a sulfur atom, and X 2 represents an oxygen atom or a sulfur atom.

In the above formula (2), R4 represents an alkylene group having 1 to 5 carbon atoms, and X3 represents an oxygen atom or a sulfur atom.

In a specific aspect of the curable composition according to the present invention, the amount of the compound having the structure represented by the formula (1) in 100% by weight of the component having at least one of the epoxy group and the thiirane group. The content of the polymer, the multimer in which at least two of the compounds are bound, or the mixture of the monomer and the multimer is in the range of 5 to 100% by weight.

In the curable composition according to the present invention, the component having at least one of the epoxy group and thiirane group is an epoxy compound monomer having a structure represented by the following formula (11), and the epoxy compound is at least It is preferable to further include a multimer in which two are combined, or a mixture of the monomer and the multimer. In this case, the curable composition can be quickly cured at a low temperature. Moreover, when a curable composition is used for the connection between the electrode of a circuit board and the electrode of an electronic component, it can connect efficiently between these electrodes.

In the above formula (11), R11 represents an alkylene group having 1 to 10 carbon atoms, R12 represents an alkylene group having 1 to 10 carbon atoms, R13 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or the following formula ( 12), R14 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a structure represented by the following formula (13).

In the above formula (12), R15 represents an alkylene group having 1 to 10 carbon atoms.

In the above formula (13), R16 represents an alkylene group having 1 to 10 carbon atoms.

In another specific aspect of the curable composition according to the present invention, in the formula (11), R13 and R14 are hydrogen atoms.

In still another specific aspect of the curable composition according to the present invention, an epoxy compound having a structure represented by the formula (11) in 100% by weight of a component having at least one of the epoxy group and the thiirane group. The content of the monomer, the multimer in which at least two of the epoxy compounds are bonded, or the mixture of the monomer and the multimer is in the range of 1 to 50% by weight.

In another specific aspect of the curable composition according to the present invention, the component having at least one of the epoxy group and the thiirane group further includes an epoxy compound having a heterocyclic ring containing a nitrogen atom.

In still another specific aspect of the curable composition according to the present invention, the epoxy compound having a heterocyclic ring containing a nitrogen atom is represented by the epoxy compound represented by the following formula (16) or the following formula (17). Epoxy compound.

In the above formula (16), R21 to R23 each represents an alkylene group having 1 to 5 carbon atoms, and Z represents an epoxy group or a hydroxymethyl group.

In the above formula (17), R24 to R26 each represents an alkylene group having 1 to 5 carbon atoms, p, q and r each represents an integer of 1 to 5, and R27 to R29 each represents an alkylene group having 1 to 5 carbon atoms. Indicates a group.

In another specific aspect of the curable composition according to the present invention, the epoxy compound having a heterocyclic ring containing a nitrogen atom is triglycidyl isocyanurate or trishydroxyethyl isocyanurate triglycidyl ether.

In still another specific aspect of the curable composition according to the present invention, the content of the epoxy compound having a heterocyclic ring containing the nitrogen atom in 100% by weight of the component having at least one of the epoxy group and the thiirane group. Is in the range of 0.1 to 10% by weight.

In another specific aspect of the curable composition according to the present invention, the component having at least one of the epoxy group and the thiirane group further includes an epoxy compound having an aromatic ring.

In yet another specific aspect of the curable composition according to the present invention, the aromatic ring is a benzene ring, a naphthalene ring or an anthracene ring.

The anisotropic conductive material according to the present invention contains a curable composition constituted according to the present invention and conductive particles.

The connection structure which concerns on this invention is the connection part which has electrically connected the 1st electrical connection object member, the 2nd electrical connection object member, and the 1st, 2nd electrical connection object member. The connecting portion is made of an anisotropic conductive material configured according to the present invention.

The connection structure according to the present invention includes a first connection target member, a second connection target member, and a connection part connecting the first and second connection target members, and the connection part. Is formed by a curable composition constructed according to the present invention.

(The invention's effect)
The curable composition according to the present invention includes a monomer having a structure represented by the above formula (1), a multimer in which at least two of the compounds are bonded, or the monomer and the multimer. Therefore, a cured product having a low linear expansion coefficient can be obtained.

Further, since the cured product of the anisotropic conductive material according to the present invention has a low coefficient of linear expansion, when the anisotropic conductive material of the present invention is used for connection between the electrode of the circuit board and the electrode of the electronic component, The reliability of the general connection can be increased.

FIG. 1 is a front cross-sectional view schematically showing a connection structure using an anisotropic conductive material including a curable composition according to an embodiment of the present invention and conductive particles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Connection structure 2 ... 1st connection object member 2a ... Upper surface 2b ... Electrode 3 ... 2nd connection object member 3a ... Lower surface 3b ... Electrode 4 ... Connection part 5 ... Conductive particle

Hereinafter, the present invention will be described in detail.

(Curable composition)
The curable composition according to the present invention contains a component having at least one of an epoxy group and a thiirane group and a curing agent. The component having at least one of the epoxy group and thiirane group is a monomer of a compound having a structure represented by the following formula (1), a multimer in which at least two of the compounds are bonded, or the monomer And a component that is a mixture of the body and the multimer (hereinafter sometimes abbreviated as component A).

Component A includes a monomer of a compound having a structure represented by the following formula (1), a multimer in which at least two of the compounds are bonded, and a mixture of the monomer and the multimer. Either.

In the above formula (1), R1 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms or a structure represented by the following formula (2), R2 represents an alkylene group having 1 to 5 carbon atoms, and R3 represents carbon X 1 represents an oxygen atom or a sulfur atom, and X 2 represents an oxygen atom or a sulfur atom.

When the number of carbon atoms of the alkyl group exceeds 5, the curing rate of the curable composition may decrease, or the linear expansion coefficient of the cured product may increase. Moreover, when carbon number of the said alkylene group exceeds 5, the cure rate of a curable composition may fall. When the carbon number of the alkyl group and the alkylene group is small, the curing rate of the curable composition is increased.

R1 in the above formula (1) is preferably an alkyl group having 1 to 3 carbon atoms or a structure represented by the above formula (2), more preferably a structure represented by the above formula (2). preferable. The alkyl group may be an alkyl group having a linear structure or an alkyl group having a branched structure.

In the above formula (1), R2 is preferably an alkylene group having 1 to 3 carbon atoms, and more preferably a methylene group. R3 in the above formula (1) is preferably an alkylene group having 1 to 3 carbon atoms, and more preferably a methylene group. The alkylene group may be an alkylene group having a linear structure or an alkylene group having a branched structure. Further, R2 and R3 may be the same or different.

In the structure represented by the above formula (1), R2 and R3 may be bonded to any part of the benzene ring of the fluorene structure. The compound having a structure represented by the above formula (1) is preferably a compound having a structure represented by the following formula (1A).

In the above formula (1A), R1 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a structure represented by the following formula (2), R2 represents an alkylene group having 1 to 5 carbon atoms, and R3 represents carbon X 1 represents an oxygen atom or a sulfur atom, and X 2 represents an oxygen atom or a sulfur atom.

X1 in the above formula (1) is an oxygen atom or a sulfur atom. X2 in the above formula (1) is an oxygen atom or a sulfur atom. When X1 and X2 in the formula (1) are oxygen atoms, the melting point of the compound having the structure represented by the formula (1) can be lowered, and the storage stability of the curable composition is improved. Can do. When X1 and X2 in the above formula (1) are sulfur atoms, the curing rate of the curable composition can be increased, and the linear expansion coefficient of the cured product can be lowered. X1 and X2 may be the same or different.

In the above formula (2), R4 is preferably an alkylene group having 1 to 3 carbon atoms, and more preferably a methylene group. The alkylene group may be an alkylene group having a linear structure or an alkylene group having a branched structure. When carbon number of the said alkylene group is small, the cure rate of a curable composition will become high.

In the structure represented by the above formula (2), R4 may be bonded to any part of the benzene ring. The structure represented by the above formula (2) is preferably a structure represented by the following formula (2A).

In the above formula (2A), R4 represents an alkylene group having 1 to 5 carbon atoms, and X3 represents an oxygen atom or a sulfur atom.

X3 in the above formula (2) is an oxygen atom or a sulfur atom. When X3 in the formula (2) is an oxygen atom, the melting point of the compound having the structure represented by the formula (1) can be lowered, and the storage stability of the curable composition can be improved. . When X3 in the above formula (2) is a sulfur atom, the curing rate of the curable composition can be increased, and the linear expansion coefficient of the cured product can be lowered. X3 may be the same as or different from X1 and X2.

The compound having the structure represented by the above formula (1) has a fluorene structure, and the total of the epoxy group and the thiirane group may be two or more. The fluorene structure, at least two epoxy groups, and at least 2 It is preferable to have at least one of thiirane groups. Since the curable composition of this invention contains the said component A, the hardened | cured material with a low linear expansion coefficient can be obtained.

Furthermore, when conductive particles are added to the curable composition of the present invention, and the composition containing the conductive particles is used for connection between electrodes of a circuit board and an electrode of an electronic component, Connection reliability can be improved.

More specifically, examples of the compound having a structure represented by the above formula (1) include a compound represented by the following formula (1B). In the compound represented by the following formula (1B), R2 in the above formula (1A) is a methylene group, R3 is a methylene group, X1 is an oxygen atom, X2 is an oxygen atom, and R1 is represented by the above formula (2A). In the formula (2A), R4 is a methylene group and X3 is an oxygen atom. Since X1, X2, and X3 in the above formulas (1) and (2) are oxygen atoms, the compound represented by the following formula (1B) is an epoxy compound.

More specifically, examples of the compound having a structure represented by the above formula (1) include a compound represented by the following formula (1C). In the compound represented by the following formula (1C), R2 in the above formula (1A) is a methylene group, R3 is a methylene group, X1 is a sulfur atom, X2 is a sulfur atom, and R1 is represented by the above formula (2A). In the formula (2A), R4 is a methylene group and X3 is a sulfur atom. Since X1, X2 and X3 in the above formulas (1) and (2) are sulfur atoms, the compound represented by the following formula (1C) is a thiirane group-containing compound having a three-membered ring structure.

The compound having the structure represented by the above formula (1) is a monomer. In the present invention, at least 2 compounds having the structure represented by the above formula (1) are used instead of the monomer of the compound having the structure represented by the above formula (1) or together with the monomer of the compound. Individually linked multimers may be used. Among them, the component A is a monomer of a compound having a structure represented by the above formula (1), a multimer in which 2 to 10 of the compounds are bonded, or a combination of the monomer and the multimer. It is preferably a mixture, more preferably a monomer of the above compound, a multimer in which 2 to 3 of the compound are bonded, or a mixture of the monomer and the multimer. More preferably, it is a mixture of the body and the multimer. When a multimer in which more than 10 compounds having the structure represented by the above formula (1) are combined is used, the viscosity of the curable composition may be too high. In addition, when the monomer of the compound having the structure represented by the formula (1) is synthesized, as a by-product, a multimer in which two or three of the monomers are combined is included, or storage conditions Depending on the case, two or more monomers may be bonded.

The epoxy compound corresponding to the compound having the structure represented by the above formula (1) can be synthesized, for example, as follows.

A raw material compound, a fluorene compound having a hydroxyl group, epichlorohydrin, sodium hydroxide, and methanol are mixed, cooled, and reacted. Thereafter, an aqueous sodium hydroxide solution is dropped. After dripping, it is further reacted to obtain a reaction solution. Next, water and toluene are added to the reaction solution, and the toluene layer is taken out. The toluene layer is washed with water and then dried to remove water and the solvent. In this way, an epoxy compound corresponding to the compound having the structure represented by the above formula (1) can be easily obtained. In addition, the fluorene compound which has a hydroxyl group which is a raw material compound is marketed, for example from JFE Chemical Company etc., for example.

Further, the thiirane group-containing compound corresponding to the compound having the structure represented by the above formula (1) is obtained by converting the epoxy group of the epoxy compound corresponding to the compound having the structure represented by the above formula (1) to a thiirane group. It can be synthesized by conversion. For example, after adding an epoxy compound that is a raw material compound or a solution containing the epoxy compound to a solution containing thiocyanate, an epoxy group is easily converted into a thiirane group by further adding a solution containing thiocyanate. it can.

In 100% by weight of the curable composition of the present invention, the component A is preferably contained in the range of 5 to 60% by weight, more preferably in the range of 10 to 50% by weight. preferable. When there is too little content of the said component A, the hardened | cured material with a sufficiently low linear expansion coefficient may not be obtained. When there is too much content of the said component A, content of a hardening | curing agent will become relatively small, and the said component A etc. may not fully be hardened.

The content of the component A in 100% by weight of the component having at least one of the epoxy group and thiirane group is preferably in the range of 5 to 100% by weight. When the component A and an epoxy component other than the component A are used in combination, the content of the component A in 100% by weight of the component having at least one of the epoxy group and the thiirane group is It is preferably in the range of 5 to 90% by weight. When content of the said component A exists in the said preferable range, hardened | cured material with a much lower linear expansion coefficient can be obtained. The more preferable lower limit of the content of the component A in 100% by weight of the component having at least one of the epoxy group and the thiirane group is 10% by weight, the still more preferable lower limit is 15% by weight, and the more preferable upper limit is 80% by weight, more preferably 60% by weight, more preferably 30% by weight, and still more preferably 20% by weight.

The component having at least one of the epoxy group and the thiirane group includes, as an epoxy component other than the component A, a monomer of an epoxy compound having a structure represented by the following formula (11), It is preferable to further include an epoxy component (hereinafter sometimes abbreviated as epoxy component B) which is a multimer in which at least two are bonded, or a mixture of the monomer and the multimer. The epoxy component B includes a monomer of an epoxy compound having a structure represented by the following formula (11), a multimer in which at least two epoxy compounds are bonded, and a mixture of the monomer and the multimer. Is one of the following.

When the number of carbon atoms of the alkylene group in the above formulas (11) to (13) exceeds 10, the curing rate of the curable composition may decrease. Moreover, when carbon number of the said alkyl group in the said Formula (11) exceeds 10, the cure rate of a curable composition may fall. When the carbon number of the alkylene group and the alkyl group in the above formulas (11) to (13) is small, the curing rate of the curable composition is increased.

R11 in the formula (11) is preferably an alkylene group having 1 to 6 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, and an alkylene group having 1 to 3 carbon atoms. Is more preferable, a methylene group or an ethylene group is more preferable, and a methylene group is more preferable. R12 in the above formula (11) is preferably an alkylene group having 1 to 6 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, and an alkylene group having 1 to 3 carbon atoms. Is more preferable, a methylene group or an ethylene group is more preferable, and a methylene group is more preferable. The alkylene group may be an alkylene group having a linear structure or an alkylene group having a branched structure. Further, R11 and R12 may be the same or different.

R13 in the above formula (11) is preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or a structure represented by the above formula (12), and a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or It is preferably a structure represented by the above formula (12), more preferably a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a structure represented by the above formula (12), a hydrogen atom, a methyl group , An ethyl group or a structure represented by the above formula (12) is more preferable, and a hydrogen atom, a methyl group or a structure represented by the above formula (12) is more preferable. R14 in the above formula (11) is preferably a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a structure represented by the above formula (13), and a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or A structure represented by the above formula (13) is more preferable, and a hydrogen atom, an alkyl group having 1 to 3 carbon atoms or a structure represented by the above formula (13) is more preferable. A group, an ethyl group, or a structure represented by the above formula (13) is more preferable, and a hydrogen atom, a methyl group, or a structure represented by the above formula (13) is more preferable. The alkyl group may be an alkyl group having a linear structure or an alkyl group having a branched structure. Also, R13 and R14 may be the same or different.

R15 in the above formula (12) is preferably an alkylene group having 1 to 6 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, and an alkylene group having 1 to 3 carbon atoms. Is more preferable, a methylene group or an ethylene group is more preferable, and a methylene group is more preferable. R16 in the above formula (13) is preferably an alkylene group having 1 to 6 carbon atoms, more preferably an alkylene group having 1 to 5 carbon atoms, and an alkylene group having 1 to 3 carbon atoms. Is more preferable, a methylene group or an ethylene group is more preferable, and a methylene group is more preferable. The alkylene group may be an alkylene group having a linear structure or an alkylene group having a branched structure.

The epoxy compound having the structure represented by the above formula (11) has an unsaturated double bond and at least two epoxy groups. By using the epoxy component B, the curable composition can be quickly cured at a low temperature. Furthermore, when the epoxy component B and conductive particles are added to the curable composition, and the composition containing the epoxy component B and the conductive particles is used for connection between electrodes of a circuit board or an electronic component, The electrodes can be connected efficiently.

Examples of the epoxy compound having the structure represented by the above formula (11) include an epoxy in which, in the above formula (11), R11 is a methylene group, R12 is a methylene group, R13 is a hydrogen atom, and R14 is a hydrogen atom. In the above formula (11), R11 is a methylene group, R12 is a methylene group, R13 is a structure represented by the following formula (14), and R14 is a hydrogen atom, and in the above formula (11) R11 is a methylene group, R12 is a methylene group, and R13 and R14 are epoxy compounds having a structure represented by the following formula (14), respectively.

Since the curable composition can be cured more rapidly at a low temperature, R13 and R14 in the above formula (11) are preferably hydrogen atoms. That is, the epoxy compound having a structure represented by the above formula (11) is preferably an epoxy compound having a structure represented by the following formula (11A).

In the above formula (11A), R11 represents an alkylene group having 1 to 10 carbon atoms, and R12 represents an alkylene group having 1 to 10 carbon atoms.

In addition, since the curable composition can be cured more rapidly at a low temperature, in the above formula (11), R11 is a methylene group, R12 is a methylene group, R13 is a hydrogen atom, and R14 is a hydrogen atom. An epoxy compound represented by the following formula (11B) is more preferable.

The epoxy compound having a structure represented by the above formula (11) is a monomer. In the present invention, the epoxy compound having the structure represented by the above formula (11) instead of the monomer of the epoxy compound having the structure represented by the above formula (11) or together with the monomer of the epoxy compound. A multimer in which at least two are bonded may be used. Among them, the epoxy component B includes an epoxy compound monomer having a structure represented by the above formula (11), a multimer in which 2 to 10 epoxy compounds are bonded, or the monomer and the large amount. A mixture of the monomer and the multimer, or a mixture of two or three of the epoxy compounds, or a mixture of the monomer and the multimer. More preferably, it is a mixture of the monomer and the multimer. When a multimer in which more than 10 epoxy compounds having a structure represented by the above formula (11) are combined is used, the viscosity of the curable composition may be too high. In addition, when the monomer of the epoxy compound having the structure represented by the above formula (11) is used, a multimer in which two or three of the monomers are combined is included as a by-product. Depending on storage conditions, two or more of the above monomers may be bonded.

The epoxy component B is preferably contained in the range of 10 to 50% by weight in 100% by weight of the curable composition of the present invention. When there is too little content of the said epoxy component B, the cure rate in low temperature may not fully be raised. When there is too much content of the said epoxy component B, content of a hardening | curing agent will become relatively small, and the component A, the epoxy component B, etc. cannot fully be hardened | cured.

The content of the epoxy component B in 100% by weight of the component having at least one of the epoxy group and thiirane group is preferably in the range of 1 to 50% by weight. When content of the said epoxy component B exists in this preferable range, a curable composition can be hardened more rapidly at low temperature. The more preferable lower limit of the content of the epoxy component B in 100% by weight of the component having at least one of the epoxy group and the thiirane group is 3% by weight, and the more preferable lower limit is 5% by weight. Is 40% by weight, and a more preferred upper limit is 30% by weight.

The curable composition of the present invention may contain an epoxy component other than the component A and the epoxy component B (hereinafter also referred to as an epoxy component C).

The component having at least one of the epoxy group and the thiirane group preferably contains, as the epoxy component C, an epoxy compound C3 having a heterocyclic ring containing a nitrogen atom. By using the epoxy compound C3, the heat resistance of the cured product of the curable composition can be further increased. Moreover, since the heat resistance of hardened | cured material can be made still higher, it is preferable that the heterocyclic ring containing a nitrogen atom is a triazine skeleton.

In addition, the component having at least one of the epoxy group and thiirane group may contain an epoxy resin C1 other than the epoxy compound C3 as the epoxy component C. In addition, the component having at least one of the epoxy group and the thiirane group may contain an epoxy compound C2 other than the epoxy compound C3 and the epoxy resin C1.

The curable composition of the present invention preferably includes the epoxy compound C2 or the epoxy compound C3, more preferably includes the epoxy compound C2, and further includes the epoxy compound C2 and the epoxy compound C3. More preferred.

The viscosity of the composition containing the epoxy component B is relatively low. By the combined use of the epoxy component B and the epoxy compound C2, the viscosity of the curable composition can be increased. Moreover, by using together the said epoxy component B and the said epoxy compound C3, the cure rate of a curable composition can be made still faster, or the heat resistance of the hardened | cured material of a curable composition can be improved. In particular, the combined use of the epoxy component B, the epoxy compound C2, and the epoxy compound C3 increases the curing rate of the curable composition, increases the heat resistance of the cured product of the curable composition, and further improves the curable composition. It can make it easier to apply objects.

The “epoxy resin” generally means a low molecular weight polymer or prepolymer having two or more epoxy groups in one molecule and having a molecular weight of 10,000 or less, or an epoxy of the polymer or prepolymer. It is a curable resin produced by a ring-opening reaction of a group. The curable resin may be a thermosetting resin or a photocurable resin.

Specific examples of the epoxy resin C1 include a bisphenol type epoxy resin, an epoxy novolac resin, or an epoxy resin having a naphthalene structure.

Examples of the commercially available epoxy compound C2 include Adeka Resin EP-3300S and Adeka Resin EP-3300E (all of which are manufactured by ADEKA). The curable composition preferably contains at least one of Adeka Resin EP-3300S and Adeka Resin EP-3300E, and more preferably contains Adeka Resin EP-3300S. By using these preferable commercial products, the viscosity of the curable composition can be effectively increased.

The epoxy compound C2 is preferably an epoxy compound having an aromatic ring. The component having at least one of the epoxy group and thiirane group preferably contains an epoxy compound having an aromatic ring. By using an epoxy compound having an aromatic ring, the curing rate of the curable composition can be increased and the curable composition can be easily applied.

The aromatic ring is preferably a benzene ring, a naphthalene ring or an anthracene ring, and more preferably a benzene ring or a naphthalene ring. In this case, the curable composition can be further easily applied.

Examples of the epoxy compound having an aromatic ring include resorcinol diglycidyl ether and 1,6-naphthalenediglycidyl ether, and resorcinol diglycidyl ether is particularly preferable. By using resorcinol diglycidyl ether, the curing rate of the curable composition can be increased, and the curable composition can be easily applied.

Since the curing rate of the curable composition can be further increased, the epoxy compound C3 having the triazine skeleton preferably has at least two epoxy groups, and more preferably has three epoxy groups.

The epoxy compound C3 is preferably an epoxy compound represented by the following formula (16) or the following formula (17). By using these preferable epoxy compounds, the curing rate of the curable composition can be increased, and the heat resistance of the cured product of the curable composition can be further enhanced.

In the above formula (16), R21 to R23 each represents an alkylene group having 1 to 5 carbon atoms, and Z represents an epoxy group or a hydroxymethyl group. R21 to R23 may be the same or different.

In the above formula (17), R24 to R26 each represents an alkylene group having 1 to 5 carbon atoms, p, q and r each represents an integer of 1 to 5, and R27 to R29 each represents an alkylene group having 1 to 5 carbon atoms. Indicates a group. R24 to R26 may be the same or different. p, q and r may be the same or different. R27 to R29 may be the same or different.

When the carbon number of R21 to R23 in the above formula (16) exceeds 5, the curing rate of the curable composition may be lowered. When the carbon number of R21 to R23 is small, the curing rate of the curable composition is increased. R21 to R23 in the above formula (16) are each preferably an alkylene group having 1 to 3 carbon atoms, more preferably a methylene group or an ethylene group, and even more preferably a methylene group.

In the above formula (16), Z is preferably an epoxy group. In this case, the curing rate of the curable composition can be increased, and the heat resistance of the cured product of the curable composition can be further enhanced.

When the carbon number of R24 to R26 in the above formula (17) exceeds 5, the curing rate of the curable composition may be lowered. When the carbon number of R24 to R26 is small, the curing rate of the curable composition is increased. R24 to R26 in the above formula (17) are each preferably an alkylene group having 2 to 4 carbon atoms, more preferably an alkylene group having 2 or 3 carbon atoms, and further more preferably an ethylene group. preferable.

Further, when p, q and r in the above formula (17) exceed 5, the curing rate of the curable composition may be lowered. When p, q, and r are small, the curing rate of the curable composition is increased. In the above formula (17), p, q and r are each preferably an integer of 1 to 3, more preferably 1 or 2, and even more preferably 1.

When the carbon number of R27 to R29 in the above formula (17) exceeds 5, the curing rate of the curable composition may be lowered. When the carbon number of R27 to R29 is small, the curing rate of the curable composition is increased. R27 to R29 in the above formula (17) are each preferably an alkylene group having 1 to 3 carbon atoms, more preferably a methylene group or an ethylene group, and even more preferably a methylene group.

The epoxy compound C3 is more preferably an epoxy compound represented by the above formula (16). By using the epoxy compound represented by the above formula (16), the curing rate of the curable composition can be increased, and the heat resistance of the cured product of the curable composition can be further enhanced.

The epoxy compound C3 is preferably trishydroxyethyl isocyanurate triglycidyl ether or triglycidyl isocyanurate, and more preferably triglycidyl isocyanurate. That is, the epoxy compound C3 is preferably an epoxy compound represented by the following formula (16A) or the following formula (17A), and more preferably an epoxy compound represented by the following formula (16A). By using these preferable epoxy compounds, the curing rate of the curable composition can be further increased.

The epoxy component C is preferably contained within a range of 0.1 to 45% by weight in 100% by weight of the curable composition.

The epoxy compound C2 is preferably contained within a range of 20 to 40% by weight in 100% by weight of the curable composition. When the content of the epoxy compound C2 is within this preferable range, the viscosity of the curable composition can be more effectively increased.

The content of the epoxy compound C2 in 100% by weight of the component having at least one of the epoxy group and thiirane group is preferably in the range of 5 to 95% by weight. The epoxy compound C2 is an epoxy compound having an aromatic ring, and the content of the compound having an aromatic ring in 100% by weight of the component having at least one of the epoxy group and the thiirane group is 5 to It is preferably in the range of 95% by weight. When the content of the epoxy compound C2 or the epoxy compound having an aromatic ring is within this preferable range, the viscosity of the curable composition can be further effectively increased. The more preferable lower limit of the content of the epoxy compound C2 or the epoxy compound having an aromatic ring in 100% by weight of the component having at least one of the epoxy group and the thiirane group is 15% by weight, and the more preferable lower limit is 35 The upper limit is 75% by weight, and the more preferable upper limit is 60% by weight.

The epoxy compound C3 is preferably contained within a range of 0.1 to 5% by weight in 100% by weight of the curable composition. When the content of the epoxy compound C3 is within this preferable range, the curing rate of the curable composition can be further increased.

The content of the epoxy compound C3 in 100% by weight of the component having at least one of the epoxy group and thiirane group is preferably in the range of 0.1 to 10% by weight. The epoxy compound C3 is an epoxy compound having a heterocyclic ring containing a nitrogen atom, and the epoxy compound having a heterocyclic ring containing a nitrogen atom in 100% by weight of the component having at least one of the epoxy group and the thiirane group. The content of is preferably in the range of 0.1 to 10% by weight. When the content of the epoxy compound C3 or the epoxy compound having a heterocyclic ring containing a nitrogen atom is within this preferable range, the curing rate of the curable composition is increased, and the heat resistance of the cured product of the curable composition is increased. It can be further increased.

The viscosity (25 ° C.) of the curable composition is preferably in the range of 20,000 to 100,000 mPa · s.

Further, the chlorine ion concentration of the curable composition is preferably 500 ppm or less. If the chlorine ion concentration is too high, the curing rate of the curable composition may be slow. The chlorine ion concentration can be measured by, for example, ICP emission analysis.

The curing agent is not particularly limited. Examples of the curing agent include an imidazole curing agent, an amine curing agent, a phenol curing agent, a polythiol curing agent, and an acid anhydride. Especially, since a curable composition can be hardened more rapidly at low temperature, an imidazole hardening | curing agent, a polythiol hardening | curing agent, or an amine hardening | curing agent is preferable. Moreover, since a storage stability can be improved when the said hardener is mixed with the component which has at least 1 type of the said epoxy group and thiirane group, a latent hardener is preferable. The latent curing agent is preferably a latent imidazole curing agent, a latent polythiol curing agent or a latent amine curing agent. Only 1 type may be used for these hardening | curing agents, and 2 or more types may be used together. In addition, the said hardening | curing agent may be coat | covered with polymeric substances, such as a polyurethane resin or a polyester resin.

The imidazole curing agent is not particularly limited, but 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-phenylimidazolium trimellitate, 2, 4-Diamino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine or 2,4-diamino-6- [2'-methylimidazolyl- (1')]-ethyl-s- Examples include triazine isocyanuric acid adducts.

The polythiol curing agent is not particularly limited, and examples include trimethylolpropane tris-3-mercaptopropionate, pentaerythritol tetrakis-3-mercaptopropionate, dipentaerythritol hexa-3-mercaptopropionate, and the like. .

The amine curing agent is not particularly limited, but is hexamethylenediamine, octamethylenediamine, decamethylenediamine, 3,9-bis (3-aminopropyl) 2,4,8,10-tetraspiro [5.5] undecane. Bis (4-aminocyclohexyl) methane, metaphenylenediamine, diaminodiphenylsulfone and the like.

The content of the curing agent is not particularly limited. The curing agent is preferably contained in the range of 1 to 40 parts by weight with respect to a total of 100 parts by weight of the component having at least one of the epoxy group and thiirane group. When the content of the curing agent is less than 1 part by weight, the curable composition may not be sufficiently cured. When content of the said hardening | curing agent exceeds 40 weight part, the heat resistance of the hardened | cured material of a curable composition may fall. In addition, “a total of 100 parts by weight of components having at least one of an epoxy group and a thiirane group” means 100 parts by weight of the component A when no other epoxy component other than the component A is included. When other epoxy components other than the component A are included, it means a total of 100 parts by weight of the component A and the other epoxy components.

In addition, when the said hardening | curing agent is an imidazole hardening | curing agent or a phenol hardening | curing agent, an imidazole hardening | curing agent or a phenol hardening | curing agent is 1 with respect to a total of 100 weight part of the component which has at least 1 type of the said epoxy group and thiirane group. It is preferably contained in the range of ˜15 parts by weight. Further, when the curing agent is an amine curing agent, a polythiol curing agent or an acid anhydride, the amine curing agent and the polythiol curing are used with respect to a total of 100 parts by weight of the component having at least one of the epoxy group and the thiirane group. The agent or acid anhydride is preferably contained in the range of 15 to 40 parts by weight.

The curable composition of the present invention may further contain a solvent. For example, when the component A is solid, when the solvent is added to the solid component A, the component A is dissolved in the solvent, so that the dispersibility of the component A in the curable composition can be improved. . Examples of the solvent include ethyl acetate, methyl cellosolve, toluene, acetone, methyl ethyl ketone, cyclohexane, n-hexane, tetrahydrofuran or diethyl ether.

In order to adjust the viscosity of the composition or to prevent the applied composition from getting wet and spreading, the curable composition of the present invention may further contain a polymerizable compound. The polymerizable compound is not particularly limited. As said polymeric compound, a crosslinkable compound or a non-crosslinkable compound is mentioned, for example. As for the said polymeric compound, only 1 type may be used and 2 or more types may be used together.

The crosslinkable compound is not particularly limited. Specific examples of the crosslinkable compound include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, (poly ) Ethylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meth) acrylate, glycerol methacrylate acrylate, pentaerythritol tri (meth) acrylate, tri Examples include methylolpropane trimethacrylate, allyl (meth) acrylate, vinyl (meth) acrylate, divinylbenzene, polyester (meth) acrylate, and urethane (meth) acrylate.

The above non-crosslinkable compound is not particularly limited. Specific examples of the non-crosslinkable compound include ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) ) Acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, decyl Examples include (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, and tetradecyl (meth) acrylate.

The content of the polymerizable compound is not particularly limited. The polymerizable compound is preferably contained in the range of 10 to 60 parts by weight with respect to 100 parts by weight of the total of the components having at least one of the epoxy group and thiirane group. When content of the said polymeric compound is less than 10 weight part, the heat resistance of the hardened | cured material of a curable composition may fall. When content of the said polymeric compound exceeds 60 weight part, the viscosity of a curable composition may become high too much.

Since the adhesive strength of the cured product of the curable composition to the adherend can be increased, the curable composition of the present invention preferably contains an adhesive strength modifier. The adhesive strength adjusting agent is preferably a silane coupling agent.

The silane coupling agent is not particularly limited. Examples of the silane coupling agent include N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, and N- (2-amino). Ethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyldimethylethoxysilane, 3-aminopropylmethyldiethoxysilane, 3-aminopropyltri Methoxysilane, 3-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriacetoxysilane, vinyltrichlorosilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, 3-chloropropyl Pyrtrimethoxysilane, 3-chloropropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropyltriethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, dodecyltriethoxysilane Hexyltrimethoxysilane, t-butylisobutyldiethoxysilane, methylphenyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, methylphenyldimethoxysilane, and the like. As for the said silane coupling agent, only 1 type may be used and 2 or more types may be used together.

The content of the silane coupling agent is not particularly limited. The silane coupling agent is preferably contained in the range of 4 to 20 parts by weight with respect to 100 parts by weight of the total of the components having at least one of the epoxy group and thiirane group. When the content of the silane coupling agent is less than 4 parts by weight, the adhesive strength of the cured product of the curable composition to the adherend may be reduced. When content of the said silane coupling agent exceeds 20 weight part, a curable composition may become difficult to harden | cure.

The curable composition of the present invention preferably contains inorganic particles. By using the inorganic particles, latent heat expansion of the cured product of the curable composition can be suppressed. The inorganic particles are not particularly limited. Examples of the inorganic particles include silica, aluminum nitride, and alumina. As for the said inorganic particle, only 1 type may be used and 2 or more types may be used together.

The content of the inorganic particles is not particularly limited. The inorganic particles are preferably contained within a range of 3 to 900 parts by weight with respect to a total of 100 parts by weight of the component having at least one of the epoxy group and thiirane group. When the content of the inorganic particles is less than 3 parts by weight, the latent heat expansion of the cured product of the curable composition may not be suppressed. When content of the said inorganic particle exceeds 900 weight part, an inorganic particle may not fully disperse | distribute in a curable composition.

The curable composition of the present invention may contain a polymerization initiator that generates reactive species by light irradiation or heating. By using the polymerization initiator, the curing rate of the curable composition can be further increased.

The polymerization initiator is not particularly limited. Examples of the polymerization initiator include acetophenone polymerization initiators, ketal polymerization initiators, halogenated ketones, acyl phosphinoxides, and acyl phosphonates. The acetophenone polymerization initiator is not particularly limited. Specific examples of the acetophenone polymerization initiator include 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, methoxyacetophenone 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-cyclohexylacetophenone, and the like. The ketal polymerization initiator is not particularly limited. Specific examples of the ketal polymerization initiator include benzyl dimethyl ketal. As for the said polymerization initiator, only 1 type may be used and 2 or more types may be used together.

The content of the polymerization initiator is not particularly limited. The polymerization initiator is preferably contained in the range of 2 to 10 parts by weight with respect to 100 parts by weight as a total of the components having at least one of the epoxy group and thiirane group. If the content of the polymerization initiator is less than 2 parts by weight, the effect of adding the polymerization initiator may not be sufficiently obtained. When content of the said polymerization initiator exceeds 10 weight part, the adhesive force of the hardened | cured material of a curable composition with respect to a to-be-adhered body may fall.

The method for producing the curable composition of the present invention is not particularly limited. As a specific example of the method for producing a curable composition, a component having at least one of the epoxy group and the thiirane group, the curing agent, and other components added as necessary are blended, The manufacturing method which mixes sufficiently using a formula stirrer etc. is mentioned.

The curable composition of the present invention can be used as a one-component adhesive for bonding a liquid crystal panel or a semiconductor chip. The curable composition of the present invention may be a paste-like adhesive or a film-like adhesive.

The method for processing the curable composition of the present invention into a film adhesive is not particularly limited. For example, a method of applying the curable composition of the present invention to a substrate such as a release paper and processing it into a film-like adhesive, or adding a solvent to the curable composition of the present invention to form a substrate such as a release paper And a method of evaporating the solvent at a temperature lower than the activation temperature of the curing agent and processing it into a film-like adhesive.

As a method of curing the curable composition of the present invention, a method of heating the curable composition, a method of irradiating the curable composition with light, and then heating the curable composition, a light of the curable composition And a method of heating the curable composition at the same time.

The heating temperature for curing the curable composition of the present invention is preferably in the range of 160 to 250 ° C, and more preferably in the range of 160 to 200 ° C. Since the curable composition of the present invention can be cured at a low temperature, the amount of energy required for heating can be reduced.

In the conventional curable composition, when the heating temperature is 200 ° C. or less, the curing time becomes long. For example, when the heating temperature is 200 ° C., the curing time exceeds 10 seconds. In contrast, the curable composition of the present invention can be cured in a short time even when the heating temperature is 200 ° C. or less. For example, if the heating temperature is 200 ° C., the curing time is 10 seconds at the longest. Can be less than. In this specification, low temperature means a temperature of 200 ° C. or lower.

In addition, as a method of curing the curable composition of the present invention, according to the method of irradiating the curable composition with light and then heating the curable composition, the curable composition is more than the method of heating alone. Can be cured in a short time.

The light source used when irradiating light to the curable composition of the present invention is not particularly limited. Examples of the light source include a light source having a sufficient light emission distribution at a wavelength of 420 nm or less. Specific examples of the light source include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave excitation mercury lamp, or a metal halide lamp. Of these, a chemical lamp is preferable. The chemical lamp efficiently emits light in the active wavelength region of the polymerization initiator and emits less light in the light absorption wavelength region of components other than the polymerization initiator in the composition. Furthermore, by using a chemical lamp, light can efficiently reach the polymerization initiator present in the composition.

For example, when a cleavage type polymerization initiator having an acetophenone group is contained, the light irradiation intensity in the wavelength region of 365 nm to 420 nm is preferably 0.1 to 100 mW / cm ² .

(Anisotropic conductive material)
By containing conductive particles in the curable composition of the present invention, an anisotropic conductive material can be obtained.

The conductive particles electrically connect the opposing electrical connection portions, for example, between the electrodes of the circuit board and the electrodes of the electronic component. The conductive particles are not particularly limited as long as at least the outer surface has conductivity. Examples of the conductive particles include organic particles, inorganic particles, organic-inorganic hybrid particles, or conductive particles whose surfaces are covered with a metal layer, or metal particles that are substantially composed only of metal. Can be mentioned. The metal layer is not particularly limited. Examples of the metal layer include a gold layer, a silver layer, a copper layer, a nickel layer, a palladium layer, or a metal layer containing tin.

The content of the conductive particles is not particularly limited. The conductive particles are preferably contained within a range of 0.5 to 5 parts by weight with respect to 100 parts by weight as a total of the components having at least one of the epoxy group and thiirane group. If the content of the conductive particles is less than 0.5 parts by weight, the electrodes may not be reliably conducted. When content of electroconductive particle exceeds 5 weight part, a short circuit may arise between the adjacent electrodes which should not be conduct | electrically_connected.

When the anisotropic conductive material is liquid or pasty, the viscosity (25 ° C.) of the anisotropic conductive material is preferably in the range of 20,000 to 100,000 mPa · s. If the viscosity is too low, the conductive particles may settle in the anisotropic conductive material. When the viscosity is too high, the conductive particles may not be sufficiently dispersed in the anisotropic conductive material.

Further, the chlorine ion concentration of the anisotropic conductive material is preferably 500 ppm or less. If the chlorine ion concentration is too high, the curing rate of the curable composition contained in the anisotropic conductive material may be slow.

The anisotropic conductive material of the present invention can be used as an anisotropic conductive paste, anisotropic conductive ink, anisotropic conductive adhesive, anisotropic conductive film, anisotropic conductive sheet or the like. When the anisotropic conductive material containing the conductive particles of the present invention is used as a film-like adhesive such as an anisotropic conductive film or an anisotropic conductive sheet, the film-like shape containing the conductive particles is used. A film-like adhesive that does not contain conductive particles may be laminated on the adhesive.

(Connection structure)
A connection structure can be obtained by connecting a connection object member using the curable composition of the present invention or the anisotropic conductive material of the present invention. The connection target member is preferably at least one of an electronic component and a circuit board.

The connection structure includes a first connection target member, a second connection target member, and a connection portion connecting the first and second connection target members, the connection portion of the present invention. It is preferably formed of an anisotropic conductive material or the curable composition of the present invention. A connection part is the hardened | cured material layer formed by hardening the anisotropic conductive material of this invention, or the curable composition of this invention.

It is preferable that the connection structure includes a first connection target member, a second connection target member, and a connection portion that electrically connects the first and second connection target members. This connecting portion is formed of the anisotropic conductive material of the present invention. Moreover, this connection part is a hardened | cured material layer, and is formed by hardening the anisotropic conductive material of this invention.

The first and second connection target members may be first and second electrical connection target members that are electrically connected. As said 1st, 2nd electrical connection object member, the various electrical connection object member which should be electrically connected mutually is mentioned. For example, one of the first and second electrical connection target members may be an electrode of a circuit board, and the other may be an electrode of an electronic component chip such as an IC chip. Further, the first and second electrical connection target members are not necessarily both electrodes.

FIG. 1 is a front sectional view schematically showing a connection structure using an anisotropic conductive material including a curable composition according to an embodiment of the present invention and conductive particles.

A connection structure 1 shown in FIG. 1 is a connection that electrically connects a first connection target member 2, a second connection target member 3, and first and second

connection target members

2 and 3. Part 4. The connection portion 4 is a cured product layer and is formed using an anisotropic conductive paste as an anisotropic conductive material including a plurality of conductive particles 5.

A plurality of electrodes 2 b are provided on the upper surface 2 a of the first connection target member 2. A plurality of electrodes 3 b are provided on the lower surface 3 a of the second connection target member 3. The second connection target member 3 is laminated on the upper surface 2 a of the first connection target member 2 via a cured product layer 4 formed of an anisotropic conductive paste containing the conductive particles 1. The electrode 2 b and the electrode 3 b are electrically connected by the conductive particles 5.

Specifically, as the connection structure, an electronic component chip such as a semiconductor chip, a capacitor chip, or a diode chip is mounted on a circuit board, and is electrically connected to an electrode on the circuit board. Mention may be made of connection structures. Examples of the circuit board include various printed circuit boards such as a flexible printed circuit board, and various circuit boards such as a glass substrate or a substrate on which a metal foil is laminated.

The manufacturing method of the connection structure of the present invention is not particularly limited. As a manufacturing method of a connection structure, for example, the anisotropic conductive material is provided between a first connection target member such as an electronic component or a circuit board and a second connection target member such as an electronic component or a circuit board. Examples of the production method include arranging and obtaining a laminate, and then heating and pressurizing the laminate.

Hereinafter, the present invention will be specifically described with reference to examples and comparative examples. The present invention is not limited only to the following examples.

In order to obtain an anisotropic conductive paste, the following materials were prepared.

(1) Component A
As the component A, various compounds in which R1, R2, R3, X1 and X2 are groups shown in the following Tables 1 to 15 were prepared. In Tables 1 to 15, when R1 has a structure represented by the formula (2A), “Formula (2A)” is described in the R1 column, and R4 and X3 in the formula (2A) are further represented. Indicated. In addition, the said component A was the mixture of the monomer and multimer of the said compound in the case of a mixing | blending.

(2) Epoxy component B
As the epoxy component B, various compounds in which R11, R12, R13 and R14 are groups shown in the following Tables 1 to 15 were prepared. In addition, the said epoxy component B was the mixture of the monomer and multimer of the said compound in the case of a mixing | blending.

(3) Epoxy component C
Epoxy resin C1: Bisphenol A type epoxy resin Epoxy compound C2-1: Adeka Resin EP-3300S (manufactured by ADEKA)
Epoxy compound C2-2: Resorcinol diglycidyl ether Epoxy compound C3-1: Triglycidyl isocyanurate (epoxy compound represented by the above formula (16A) Epoxy compound C3-2: trishydroxyethyl isocyanurate triglycidyl ether (the above formula ( Epoxy compounds represented by 17A)

(4) Solvent ethyl acetate

(5) Curing agent 1,2-dimethylimidazole Imidazole curing agent (amine adduct type curing agent, “Amicure PN-23J” manufactured by Ajinomoto Fine Techno Co., Ltd.)
Amine curing agent (ethylenediamine)
Polythiol curing agent (“TMMP: Trimethylolpropane tris-3-mercaptopropionate” manufactured by SC Organic Chemical Co., Ltd.)
Phenol hardener ("Sumilite-PR-HF-3" manufactured by Sumitomo Bakelite)
Acid anhydride ("YH-307" manufactured by Japan Epoxy Resin)

Example 1
As the component A, an epoxy compound represented by the above formula (1B) was prepared. In the compound represented by the formula (1B), R2 in the formula (1A) is a methylene group, R3 is a methylene group, X1 is an oxygen atom, X2 is an oxygen atom, and R1 is represented by the formula (2A). In the formula (2A), R4 is a methylene group and X3 is an oxygen atom.

120 parts by weight of a mixture containing 100 parts by weight of the epoxy compound represented by the formula (1B) and 20 parts by weight of ethyl acetate as the component A, 7 parts by weight of silica particles having an average particle diameter of 0.02 μm, and a curing agent 40 parts by weight of an imidazole curing agent (amine adduct type curing agent, “Amure PN-23J” manufactured by Ajinomoto Fine Techno Co.), 4.5 parts by weight of 3-glycidoxypropyltriethoxysilane as a silane coupling agent, and average particles 2 parts by weight of conductive particles having a diameter of 3 μm were blended to obtain a composition. The conductive particles used are conductive particles having a metal layer in which a nickel plating layer is formed on the surface of divinylbenzene resin particles and a gold plating layer is formed on the surface of the nickel plating layer. is there.

The composition obtained at 2000 rpm was stirred for 8 minutes using a planetary stirrer, and filtered using a nylon filter paper (pore size: 10 μm) to prepare an anisotropic conductive paste as an anisotropic conductive material.

(Example 2)
In place of 120 parts by weight of a mixture containing 100 parts by weight of the epoxy compound represented by the above formula (1B) and 20 parts by weight of ethyl acetate, 50 parts by weight of the epoxy compound represented by the above formula (1B) as the above component A; An anisotropic conductive paste was obtained in the same manner as in Example 1 except that 50 parts by weight of the epoxy compound represented by the formula (11B) was used as the epoxy component B.

(Example 3)
In place of 120 parts by weight of a mixture containing 100 parts by weight of the epoxy compound represented by the above formula (1B) and 20 parts by weight of ethyl acetate, 30 parts by weight of the epoxy compound represented by the above formula (1B) as the above component A; Except for using 40 parts by weight of the epoxy compound represented by the above formula (11B) as the epoxy component B and 30 parts by weight of Adeka Resin EP-3300S (manufactured by ADEKA) as the epoxy compound C2-1. In the same manner as in Example 1, an anisotropic conductive paste was obtained.

Example 4
In place of 120 parts by weight of a mixture containing 100 parts by weight of the epoxy compound represented by the above formula (1B) and 20 parts by weight of ethyl acetate, 30 parts by weight of the epoxy compound represented by the above formula (1B) as the above component A; 40 parts by weight of the epoxy compound represented by the formula (11B) as the epoxy component B, 25 parts by weight of Adeka Resin EP-3300S (manufactured by ADEKA) as the epoxy compound C2-1, and the epoxy compound C3-1 An anisotropic conductive paste was obtained in the same manner as in Example 1 except that 5 parts by weight of the epoxy compound represented by the above formula (16A) was used.

(Comparative Example 1)
100 parts by weight of a bisphenol A type epoxy resin as the epoxy resin C1 and 5 parts by weight of 1,2-dimethylimidazole as a curing agent were blended and stirred for 5 minutes at 2000 rpm using a planetary stirrer to obtain a mixture. .

To the obtained mixture, 7 parts by weight of silica particles having an average particle size of 0.02 μm and 2 parts by weight of conductive particles having an average particle size of 3 μm were added to obtain a composition. The conductive particles used are conductive particles having a metal layer in which a nickel plating layer is formed on the surface of divinylbenzene resin particles and a gold plating layer is formed on the surface of the nickel plating layer. is there.

Using a planetary stirrer, the curable composition obtained at 2000 rpm was stirred for 8 minutes and filtered through a nylon filter paper (pore diameter 10 μm) to prepare an anisotropic conductive paste.

(Examples 5 to 84 and Comparative Examples 2 to 6)
An anisotropic conductive paste was obtained in the same manner as in Example 1 except that the types and amounts of the ingredients were changed as shown in Tables 2 to 15 below. When ethyl acetate was used, ethyl acetate was used to dissolve component A when component A was added.

(Evaluation)
A metal mold in which a rectangular parallelepiped recess having a size of 0.3 cm in length, 1 cm in width, and 7 cm in depth was prepared. The obtained anisotropic conductive paste was filled in the recesses of the metal mold. The anisotropic conductive paste filled in the recess of the metal mold was heated at 100 ° C. for 10 minutes and then heated at 150 ° C. for 30 minutes to prepare a cured product of the anisotropic conductive paste.

The linear expansion coefficient of the obtained cured product was measured using a thermomechanical analyzer (manufactured by TA Instruments, model “TMA2940”). In addition, it heated to 210 degreeC with the temperature increase rate of 5 degree-C / min, and measured the linear expansion coefficient. In the said evaluation, the anisotropic electrically conductive paste whose coefficient of linear expansion is 65 ppm / degrees C or less was set as the pass.

Further, using a differential scanning calorimeter (manufactured by TI Instruments, model “DSC2920”), the peak temperature of the anisotropic conductive paste obtained in the examples and comparative examples under the condition of a temperature rising rate of 10 ° C./min. And calorific value were measured. In Tables 2 to 15 showing the evaluation results of Examples 5 to 84 and Comparative Examples 2 to 6, “◎” indicates that the peak temperature is 125 ° C. or lower, and “peak” indicates that the peak temperature is higher than 125 ° C. and lower than 135 ° C. The results are shown as “◯” and “Δ” when the peak temperature exceeds 135 ° C.

The evaluation results of Examples 1 to 4 and Comparative Example 1 are shown in Table 1 below.

It can be seen that the anisotropic conductive pastes of Examples 1 to 4 have a lower coefficient of linear expansion of the cured product than the anisotropic conductive paste of Comparative Example 1, and thus are difficult to peel off from the circuit board or electronic component even when heated. . Furthermore, since the anisotropic conductive pastes of Examples 2 to 4 have lower peak temperatures and higher calorific values than the anisotropic conductive pastes of Example 1 and Comparative Example 1, they can be cured quickly. I understand.

The evaluation results of Examples 5 to 84 and Comparative Examples 2 to 6 are shown in Tables 2 to 15 below.

It can be seen that the anisotropic conductive pastes of Examples 5 to 84 have a low coefficient of linear expansion of the cured product, and thus are difficult to peel off from the circuit board or the electronic component even when heated.

Claims

Containing a component having at least one of an epoxy group and a thiirane group, and a curing agent;
The component having at least one of the epoxy group and thiirane group is a monomer of a compound having a structure represented by the following formula (1), a multimer in which at least two of the compounds are bonded, or the monomer A curable composition comprising a mixture of a body and the multimer.

In the above formula (1), R1 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a structure represented by the following formula (2), R2 represents an alkylene group having 1 to 5 carbon atoms, and R3 represents carbon X 1 represents an oxygen atom or a sulfur atom, and X 2 represents an oxygen atom or a sulfur atom.

In the above formula (2), R4 represents an alkylene group having 1 to 5 carbon atoms, and X3 represents an oxygen atom or a sulfur atom.
In 100% by weight of the component having at least one of the epoxy group and thiirane group, a monomer of a compound having a structure represented by the formula (1), a multimer in which at least two of the compounds are bonded, or The curable composition according to claim 1, wherein the content of the mixture of the monomer and the multimer is in the range of 5 to 100% by weight.
The component having at least one of the epoxy group and thiirane group is a monomer of an epoxy compound having a structure represented by the following formula (11), a multimer in which at least two epoxy compounds are bonded, or the The curable composition according to claim 1, further comprising a mixture of a monomer and the multimer.

In the above formula (11), R11 represents an alkylene group having 1 to 10 carbon atoms, R12 represents an alkylene group having 1 to 10 carbon atoms, R13 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or the following formula ( 12), R14 represents a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, or a structure represented by the following formula (13).

In the above formula (12), R15 represents an alkylene group having 1 to 10 carbon atoms.

In the above formula (13), R16 represents an alkylene group having 1 to 10 carbon atoms.
The curable composition according to claim 3, wherein R13 and R14 in the formula (11) are hydrogen atoms.
A monomer of an epoxy compound having a structure represented by the formula (11) in 100% by weight of a component having at least one of the epoxy group and thiirane group, and a multimer in which at least two of the epoxy compounds are bonded. The curable composition according to claim 3, wherein the content of the monomer and the mixture of the multimer is in the range of 1 to 50% by weight.
The curable composition according to claim 1, wherein the component having at least one of the epoxy group and the thiirane group further includes an epoxy compound having a heterocyclic ring containing a nitrogen atom.
The curable composition according to claim 6, wherein the epoxy compound having a heterocyclic ring containing a nitrogen atom is an epoxy compound represented by the following formula (16) or an epoxy compound represented by the following formula (17). .

In the above formula (16), R21 to R23 each represents an alkylene group having 1 to 5 carbon atoms, and Z represents an epoxy group or a hydroxymethyl group.

In the above formula (17), R24 to R26 each represents an alkylene group having 1 to 5 carbon atoms, p, q and r each represents an integer of 1 to 5, and R27 to R29 each represents an alkylene group having 1 to 5 carbon atoms. Indicates a group.
The curable composition according to claim 7, wherein the epoxy compound having a heterocyclic ring containing a nitrogen atom is triglycidyl isocyanurate or trishydroxyethyl isocyanurate triglycidyl ether.
The content of the epoxy compound having a heterocyclic ring containing a nitrogen atom in 100% by weight of the component having at least one of the epoxy group and thiirane group is in the range of 0.1 to 10% by weight. 6. The curable composition according to 6.
The curable composition according to claim 1, wherein the component having at least one of the epoxy group and the thiirane group further contains an epoxy compound having an aromatic ring.
The curable composition according to claim 10, wherein the aromatic ring is a benzene ring, a naphthalene ring or an anthracene ring.
An anisotropic conductive material containing the curable composition according to claim 1 and conductive particles.
A first electrical connection target member; a second electrical connection target member; and a connection part that electrically connects the first and second electrical connection target members.
A connection structure in which the connection portion is formed of the anisotropic conductive material according to claim 12.
A first connection target member, a second connection target member, and a connection portion connecting the first and second connection target members;
The connection structure in which the said connection part is formed with the curable composition of Claim 1.