WO2020080326A1 - 耐寒性に優れる硬化性オルガノポリシロキサン組成物、パターン形成方法および電子部品等 - Google Patents
耐寒性に優れる硬化性オルガノポリシロキサン組成物、パターン形成方法および電子部品等 Download PDFInfo
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- C08L83/04—Polysiloxanes
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- B05D2518/00—Other type of polymers
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
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- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Definitions
- the present invention provides a curable organopolysiloxane composition having particularly excellent cold resistance of a cured product and rheological properties suitable for precision coating and fine pattern formation by a fine droplet coating device such as a jet dispenser, and pattern formation using the same.
- the present invention relates to a method and an electronic component (including a MEMS device) or a precursor thereof including a curable organopolysiloxane composition or a cured product thereof applied by a fine droplet coating device such as a jet dispenser.
- the curable organopolysiloxane composition is widely used as a protective agent or adhesive composition for electric / electronic parts, or for filling and sealing gaps in image display devices such as mobile phones and touch panels. It contributes to the improvement of durability and the durability.
- a one-pack type curable organopolysiloxane composition that cures using a hydrosilylation reaction has excellent handling workability and curing speed, excellent heat resistance of the cured product, adhesiveness to a substrate, and cured product. It has an advantage over other materials in that the hardness can be controlled as desired.
- a fine curable organopolysiloxane composition pattern is formed on a substrate such as an electronic material or an image display device. Electronic parts are required.
- each application area is a substantially dot-like area having a diameter of 1 mm or less, or a linear area having a width of 1 mm or less.
- a fine droplet coating device such as an inkjet system or a dispenser coating system for coating.
- these existing curable organopolysiloxane compositions are liquid, and when applied using a fine droplet application device, for example, when a fine droplet application device equipped with fine nozzles of 1000 ⁇ m or less is used. Even in this case, scattering or spreading (outflow) occurs in a range exceeding the intended coating area, and it is difficult to form a fine pattern.
- Patent Document 1 In order to solve such a problem, in Patent Document 1, two kinds of curable organopolysiloxanes that react by mixing are separately applied from two different nozzles and mixed on a base material to obtain a rapid curing property.
- a simple pattern production method using an excellent curable polyorganosiloxane composition has been proposed.
- this method requires a fine droplet coating device corresponding to a nozzle for two liquids, and multi-component coating and liquid separation coating substantially depending on physical contact of the two liquids on a substrate. Therefore, the work efficiency and precision coating properties are not sufficient, and in particular, regarding the curing properties, there may be cases where the curability or the properties of the cured product cannot be realized assuming the complete mixing of both liquids.
- a curable organopolysiloxane suitable for precision coating and fine pattern formation by a one-component type fine droplet coating device such as a jet dispenser.
- MEMS devices such as small and highly integrated sensors using the MEMS (microelectromechanical systems) technology have been widely used.
- MEMS (microelectromechanical systems) devices are used at low temperature because they are used in a wide temperature range including low temperature of about -70 ° C to room temperature.
- Patent Documents 2 to 5 are known as techniques for improving the cold resistance of a composition.
- Patent Document 2 by using a combination of an organohydrogensilane compound and an organohydrogenpolysiloxane having a silicon atom-bonded hydrogen atom only at a molecular chain terminal in a gel-type hydrosilylation reaction cured product at a fixed ratio, -75 It has been proposed that it is possible to suppress the change in elastic modulus at temperatures between 25 ° C and 25 ° C.
- the composition is in the form of gel, is not suitable for precision coating / formation of a fine pattern, and cannot achieve sufficient hardness as a die attach agent.
- Patent Documents 3 and 4 cold resistance is realized by using a large amount of a resin-structured organopolysiloxane or branched organopolysiloxane, but cold resistance at -70 ° C. is unsatisfactory. In addition to being sufficient, there is a problem that it cannot be applied to precision coating and fine pattern formation.
- Patent Document 5 proposes the use of an organopolysiloxane containing 1 mol% or more of phenyl groups for the purpose of improving the cold resistance of a silicone adhesive sheet, but the document is intended for sheet formation.
- the problems relating to precision coating and fine pattern formation have not been described or suggested, and the compositions described in the examples and the like cannot be applied to precision coating and fine pattern formation.
- the present invention has been made to solve the above-mentioned problems, and it is possible to perform precision coating and fine pattern formation with a fine liquid droplet coating device such as a jet dispenser in a one-liquid system, and its curability and handling workability are excellent.
- a fine liquid droplet coating device such as a jet dispenser
- the present invention aims to provide an electronic component or a precursor thereof provided with the composition or a cured product thereof.
- the present inventors have focused on the rheological properties of the composition, a curable organopolysiloxane composition whose viscosity and fluidity greatly change in a high shear region to a low shear region,
- the inventors have found that the above problems can be solved by using a composition in which the content of silicon atom-bonded aromatic functional groups in the composition is within a certain range, and have reached the present invention. That is, when a composition is applied for ejection from a fine droplet application device or the like, the fluidity of the composition increases, and smooth ejection from a nozzle or the like is possible.
- the object of the present invention is that the viscosity at a strain rate of 1,000 (1 / s) is 2.0 Pa ⁇ s or less, and the viscosity at a strain rate of 0.1 (1 / s) is The viscosity is 50.0 times or more of the viscosity at 000 (1 / s), and the content of the silicon atom-bonded aromatic functional group in the composition is 1.0 to 6.0% by mass.
- a range of curable organopolysiloxane compositions solve the problem.
- the viscosity at a strain rate of 1,000 (1 / s) is 1.5 Pa ⁇ s or less
- the viscosity at a strain rate of 0.1 (1 / s) is 50 Pa ⁇ s or more.
- the viscosity at a strain rate of 1,000 (1 / s) may be a value 75.0 times or more the viscosity at a strain rate of 0.1 (1 / s), or even 100.0 times or more.
- the content range of the silicon atom-bonded aromatic functional group in the composition may be in the range of 1.5 to 5.0% by mass, preferably 2.0 to 4.0% by mass. It can be a range.
- a known method can be used, and for example, the rheometer MCR-102 manufactured by Anton Paar can be used under the following measurement conditions.
- the curable organopolysiloxane composition of the present invention is not limited in its curing system, it preferably contains at least a hydrosilylation-reactive organopolysiloxane, and (A) has a viscosity of 10 at 25 ° C.
- Organohydrogenpolysiloxane An amount such that the silicon atom-bonded hydrogen atom in the component (B) is 0.2 to 5 mol with respect to 1 mol of the alkenyl group contained in the component (A), (C) a catalytic amount of a catalyst for hydrosilylation reaction, (D) 2.5 to 20.0 parts by mass of a functional filler having an average particle diameter of 0.01 to 10 ⁇ m measured by a laser diffraction / scattering method, Organo containing (E) one or more kinds of adhesion promoters and (F) hydrosilylation reaction inhibitor, and at least a part of the component (A) or the component (B) has a silicon atom-bonded aromatic functional group.
- a part of the component (A) has a viscosity (A1) at 25 ° C. of 10 to 100,000 mPa ⁇ s and contains a silicon atom-bonded aromatic functional group in a range of 2.0 to 25.0 mass%.
- the alkenyl group-containing organopolysiloxane is From the viewpoint of high viscosity and low fluidity in a low strain rate region, the component (D) is a reinforcing filler (D1) having an average primary particle diameter of 0.01 to 0.5 ⁇ m. You may have at least.
- the component (F) is a mixture of (F1) an acetylene-based hydrosilylation reaction inhibitor and (F2) a cycloalkenylsiloxane-based hydrosilylation reaction inhibitor. Good.
- the object of the present invention is preferably achieved by a one-pack type curable organopolysiloxane composition, and in particular, any one-pack type curable organopolysiloxane composition used for pattern formation applications.
- the pattern is preferably a so-called fine pattern, and is a coating area of the curable organopolysiloxane composition, and its shape is a coating area or line width of 1000 ⁇ m that fits within a frame having a length and width of 1000 ⁇ m. It may be the following linear region or a combination thereof, and in particular, it is preferably a fine pattern formed by forming a plurality of substantially dot-shaped or linear coating regions.
- the object of the present invention is preferably achieved by a one-pack type curable organopolysiloxane composition applied by a fine droplet coating device.
- the fine droplet coating device may be of an inkjet coating type or a dispenser coating type, but is most preferably a jet dispenser.
- the object of the present invention is achieved by a method for forming a pattern, characterized in that any one of the above-mentioned curable organopolysiloxane compositions is applied to a substrate by a fine droplet coating device.
- the pattern is formed by applying the composition using a fine droplet coating device having a nozzle diameter of 1000 ⁇ m or less, a coating region that fits within a frame having a length and width of 1000 ⁇ m, or a linear shape having a line width of 1000 ⁇ m or less. It is preferable to include at least a region or a combination thereof, and it is preferable that the fine pattern has a plurality of substantially dot-shaped application regions. Further, in the above pattern forming method, it is particularly preferable to use a jet dispenser as the fine droplet coating device.
- an electronic component or a precursor thereof which has a structure in which the above-mentioned curable organopolysiloxane composition or a cured product thereof is applied to at least a part of the region.
- the region to which the above-mentioned curable organopolysiloxane composition or its cured product is applied is formed for one or more purposes selected from protection, sealing, sealing and coating of electronic components or their precursors.
- protection, sealing, sealing and coating of electronic components or their precursors preferable.
- semiconductor chips, protection of electrodes or wiring, sealing of semiconductor chips and electrodes, sealing of gaps and gaps of electronic parts, coating of these are specific applications, protection using the above fine pattern, Preference is given to sealing, sealing and coating.
- the electronic component may be a semiconductor device, and in particular, the electronic component may be a MEMS device.
- the present invention it is possible to perform precise coating and fine pattern formation by a single liquid system using a fine droplet coating device such as a jet dispenser, and its curability and handling workability are excellent, and particularly, the cured product has excellent cold resistance and a wide temperature range.
- a curable organopolysiloxane composition that can be used in a region, and a pattern forming method using the same can be provided. Furthermore, it is possible to provide an electronic component or a precursor thereof provided with the composition or a cured product thereof.
- the curable organopolysiloxane composition increases the fluidity of the composition when a shear is applied to it for ejection from a fine droplet coating device or the like, smooth ejection from a nozzle or the like is possible. Once ejected from a nozzle or the like and the composition is released from the share at the time of ejection, it has macroscopic rheological characteristics that the fluidity of the composition is significantly reduced and the composition becomes highly viscous. That is, the composition is capable of being smoothly discharged by a fine droplet coating device or the like, but suddenly loses fluidity from discharge to application to a base material and becomes a highly viscous droplet.
- the curable organopolysiloxane composition according to the present invention contains a certain amount of silicon atom-bonded aromatic functional groups in the composition, different molecular arrangements derived from aromatic functional groups in the cured product are random. Will be introduced to. As a result, as compared with the case where a silicon atom-bonded aromatic functional group is scarcely contained or a large amount is contained, as compared with the case where the main molecular structure of the cured product is a silicon atom-bonded aromatic functional group, at a low temperature such as ⁇ 70 ° C. Also, changes in elastic modulus of the cured product are suppressed, cold resistance is improved, and reliability and low-temperature durability of the curable organopolysiloxane composition or an electronic component including the cured product are improved.
- the viscosity of the curable organopolysiloxane composition according to the present invention changes depending on its strain rate (1 / s), and the viscosity at a strain rate of 1,000 (1 / s) is 2. It is 0 Pa ⁇ s or less, and the viscosity at a strain rate of 0.1 (1 / s) is 50.0 times or more the viscosity at a strain rate of 1,000 (1 / s). .
- This large change in viscosity corresponds to a large change in fluidity from the high shear region to the low shear region of the composition, and preferably the viscosity at a strain rate of 1,000 (1 / s) is It is a value 75.0 times or more the viscosity at a strain rate of 0.1 (1 / s), and preferably 100.0 times or more.
- the composition has a viscosity of 1.5 Pa ⁇ s or less at a strain rate of 1,000 (1 / s). It is preferable that the viscosity at a strain rate of 0.1 (1 / s) is 50 Pa ⁇ s or more. The smaller the viscosity at a strain rate of 1,000 (1 / s), the easier it is to discharge from a jet dispenser or the like and the problems such as nozzle clogging do not occur. Therefore, the viscosity at a strain rate of 1,000 (1 / s) is 0.
- the viscosity is in the range of 50.0 to 500.0 Pa ⁇ s and 55.0 to 300.0 Pa ⁇ s on the assumption that the viscosity is 50 times or more the viscosity at the strain rate of 1,000 (1 / s). It may range, or range from 55.0 to 275.0.
- the curable organopolysiloxane composition according to the present invention has thixotropic properties.
- the viscosity in the high shear region of the composition can be designed mainly by selecting the polymer component (organopolysiloxane), and the viscosity in the low shear region of the composition is mainly selected by the filler. Allows its design.
- the curable organopolysiloxane composition of the present invention is not particularly limited to the constituent components, the curing system, the organopolysiloxane and the filler thereof, as long as the above-mentioned characteristics are satisfied, and the cured product A desired composition can be designed according to the characteristics and purpose of use.
- the curable organopolysiloxane composition according to the present invention is characterized in that the composition contains a certain amount of silicon atom-bonded aromatic functional groups.
- the silicon atom-bonded aromatic functional group is randomly introduced into the siloxane molecular array at the time of curing, so that the silicon atom-bonded aromatic functional group is predominantly contained in the array mainly composed of the dimethylpolysiloxane group at a constant ratio.
- a siloxane array containing is formed.
- the molecular arrangement becomes moderately inhomogeneous, the change in elastic modulus of the cured product is suppressed even at a low temperature such as ⁇ 70 ° C., the cold resistance is improved, and the curable organopolysiloxane composition or The reliability and low temperature durability of the electronic component provided with the cured product are improved.
- the content of the silicon atom-bonded aromatic functional group in the composition is in the range of 1.0 to 6.0% by mass, and a cured product of the curable organopolysiloxane composition excluding an organic solvent and the like.
- the content of the silicon atom-bonded aromatic functional group is preferably in the range of 1.0 to 6.0 mass% with respect to the total amount of the forming components (components (A) to (F) described later), and the composition
- the content of the silicon atom-bonded aromatic functional group therein is more preferably in the range of 1.5 to 5.0% by mass, and particularly preferably in the range of 2.0 to 4.0% by mass. If the content of the silicon atom-bonded aromatic functional group in the composition is less than the lower limit, the cold resistance of the cured product cannot be sufficiently improved, and the elasticity changes rapidly especially at low temperatures such as -70 ° C. This causes a decrease in reliability and low temperature durability of the electronic component using the cured product.
- the silicon atom-bonded aromatic functional group is an aromatic functional group that is an aryl group or an aralkyl group bonded to a silicon atom, and is one or more aryl groups selected from a phenyl group, a tolyl group, a xylyl group, and a naphthyl group. Is preferable, and from the viewpoint of industrial production, a phenyl group is particularly preferable.
- means for introducing a silicon atom-bonded aromatic functional group is optional, but a part of the curing-reactive organopolysiloxane is preferably an organopolysiloxane having a silicon atom-bonded aromatic functional group, In that case, it is preferable to use a curing-reactive organopolysiloxane containing a silicon atom-bonded aromatic functional group in the range of 2.0 to 25.0% by mass.
- the curable organopolysiloxane composition according to the present invention is not particularly limited in the curing system, and is a functional group having curing reactivity such as hydrosilylation reaction, condensation reaction, radical reaction, and high energy ray reaction. It is preferable to contain at least one or more kinds in the composition.
- the composition has a hydrosilylation-reactive functional group, since handling workability and rapid curing are possible, and if desired, a condensation-reactive functional group or a high energy ray reactive May further have a functional group of, and may be used in combination with a radical reaction such as a peroxide.
- the curable organopolysiloxane composition of the present invention comprises (A) 100 parts by mass of an alkenyl group-containing organopolysiloxane having a viscosity at 25 ° C. of 10 to 100,000 mPa ⁇ s, (B) Organohydrogenpolysiloxane: An amount such that the silicon atom-bonded hydrogen atom in the component (B) is 0.2 to 5 mol with respect to 1 mol of the alkenyl group contained in the component (A), (C) a catalytic amount of a catalyst for hydrosilylation reaction, (D) 2.5 to 20.0 parts by mass of a functional filler having an average particle diameter of 0.01 to 10 ⁇ m measured by a laser diffraction / scattering method, Organo containing (E) one or more kinds of adhesion promoters and (F) hydrosilylation reaction inhibitor, and at least a part of the component (A) or the component (B) has a silicon atom-bonded aromatic functional
- the alkenyl group-containing organopolysiloxane which is the component (A), is the main ingredient of the present composition and has a viscosity at 25 ° C. of 10 to 100,000 mPa ⁇ s.
- the “viscosity at 25 ° C.” is a kinematic viscosity measured by the component (A) alone with a rotary viscometer or the like.
- at least a part of the component (A) has a viscosity of (A1) at 25 ° C. of 10 to 100,000 mPa ⁇ s and a silicon atom-bonded aromatic functional group of 2.0 to 25.0% by mass.
- the contained alkenyl group-containing organopolysiloxane is preferable.
- the viscosity of component (A) at 25 ° C. is preferably in the range of 10 to 100,000 mPa ⁇ s, and more preferably in the range of 10 to 10,000 mPa ⁇ s.
- the viscosity of the component (A) is less than 10 mPa ⁇ s, the viscosity at a strain rate of 0.1 (1 / s) of the composition may excessively decrease, and the above rheological properties may not be realized.
- the component (A) is composed of one or more alkenyl group-containing organopolysiloxanes.
- the molecular structure of such an alkenyl group-containing organopolysiloxane is not particularly limited, and examples thereof include linear, branched, cyclic, three-dimensional network structures, and combinations thereof.
- the component (A) may be composed only of a straight chain alkenyl group-containing organopolysiloxane, or may be composed only of a branched structure alkenyl group-containing organopolysiloxane, or may be composed of a straight chain organopolysiloxane.
- It may be composed of a mixture of a polysiloxane and an alkenyl group-containing organopolysiloxane having a branched structure.
- alkenyl group in the molecule include vinyl group, allyl group, butenyl group, hexenyl group and the like.
- organic group other than the alkenyl group in the component (A) an alkyl group such as a methyl group, an ethyl group and a propyl group; an aryl group such as a phenyl group and a tolyl group; a 3,3,3-trifluoropropyl group, etc.
- the monovalent hydrocarbon group excluding the alkenyl group such as the halogenated alkyl group of is exemplified.
- At least a part of the component (A) has a silicon atom-bonded aromatic functional group in addition to the alkenyl group, and particularly one or more kinds selected from a phenyl group, a tolyl group, a xylyl group, and a naphthyl group. It further has an aryl group.
- the component (A) is a linear alkenyl group-containing organopolysiloxane.
- the bonding site of the alkenyl group is not particularly limited, and may be at the end of the molecular chain or may be in the form of being bonded to the side chain via the silicon atom on the polysiloxane constituting the main chain.
- an alkenyl group may be contained at both ends of the molecular chain, or an alkenyl group may be contained only at both ends of the molecular chain.
- the component (A) is not particularly limited, but includes, for example, dimethylpolysiloxane endcapped with dimethylvinylsiloxy groups at both molecular chain ends, dimethylsiloxane-methylphenylsiloxane copolymer endcapped with dimethylvinylsiloxy groups at both molecular chain ends, and both molecular chain ends.
- these alkenyl group-containing organopolysiloxanes have a low molecular weight siloxane oligomer (octamethyltetrasiloxane (D4), decamethylpentasiloxane (D5)) reduced or removed from the viewpoint of prevention of contact failures. Is preferred.
- the organopolysiloxane having a silicon atom-bonded aromatic functional group which is the component (A1), may be added in an amount of 5 to 50% by mass based on the total amount of the component (A).
- An alkenyl group-containing organopolysiloxane having a content of 2.0 to 25.0 mass%, more preferably 3.0 to 15.0 mass% is used as at least a part of the component (A1).
- the component (A) of the present invention further comprises a general formula bonded to a silicon atom:
- R 1 is the same or different monovalent hydrocarbon group having no aliphatic unsaturated bond
- R 2 is an alkyl group
- R 3 is the same or different alkylene group
- a Is an integer of 0 to 2 and p is an integer of 1 to 50.
- the organopolysiloxane having these functional groups suppresses the thickening of the composition in the uncured state and has an alkoxysilyl group in the molecule, and therefore functions also as a surface treatment agent for the component (D). For this reason, thickening and oil bleeding of the obtained composition may be suppressed, and there may be a benefit that handling workability is not impaired.
- the component (A) may be added alone to the composition, or may be kneaded with the component (D) described below and added to the composition in the form of a masterbatch or the like. The same applies to the component (A1) which is a part of the component (A).
- the component (B) is a main cross-linking agent of the composition of the present invention, and organohydrogenpolysiloxane having two or more silicon atom-bonded hydrogen atoms in the molecule can be preferably used without particular limitation. From the viewpoint of flexibility of a cured product obtained by curing the composition of the present invention, the structure of the organohydrogenpolysiloxane and the number (average value) of silicon atom-bonded hydrogen atoms in the molecule may be designed.
- a straight-chain organoorganic compound having at least two in the molecular chain side chain may be used as a chain extender, and in order to obtain a cured product having high hardness, a large number of silicon atom-bonded hydrogen atom organohydrogen polysiloxanes may be used as a cross-linking agent in the side chain, You may use these together.
- a part of the component (B) may be an organohydrogenpolysiloxane having two or more silicon atom-bonded hydrogen atoms in the molecule and a silicon atom-bonded aromatic functional group.
- the curable organopolysiloxane composition of the present invention is a composition comprising the above components (A) to (F), and the component (A) does not contain sufficient silicon atom-bonded aromatic functional groups. In some cases, it is necessary for component (B) to have sufficient silicon atom-bonded aromatic functional groups in order to improve cold resistance. However, when the component (A) contains a sufficient amount of silicon atom-bonded aromatic functional group, the component (B) may be an organohydrogenpolysiloxane containing no silicon atom-bonded aromatic functional group.
- the component (B) contains at least 0.2 to 50 mol of silicon-bonded hydrogen atoms in the component (B) with respect to 1 mol of the alkenyl group contained in the component (A). It may be in the range of 0.2 to 30 mol, and may be in the range of 0.2 to 10, 0.2 to 5 mol.
- Such a component (B) is a methyl chain-terminated trimethylsiloxy group-blocked methylhydrogensiloxane / dimethylsiloxane copolymer, a molecular chain-terminated dimethylhydrogensiloxy group-blocked methylhydrogensiloxane / dimethylsiloxane copolymer, a molecule.
- An example is hydrogen polysiloxane. Note that these examples are not limiting, and a part of the methyl group may be substituted with a C2 or higher alkyl group, a phenyl group, a hydroxyl group, an alkoxy group, a halogen atom-substituted alkyl group, or the like.
- the viscosity of the component (B1) at 25 ° C. is not particularly limited, but it is preferably in the range of 1 to 500 mPa ⁇ s, and from the viewpoint of preventing contact failure, etc., a low molecular weight siloxane oligomer (octamethyltetrasiloxane ( D4) and decamethylpentasiloxane (D5)) are preferably reduced or removed.
- Examples of the hydrosilylation reaction catalyst include platinum-based catalysts, rhodium-based catalysts, and palladium-based catalysts. Platinum-based catalysts are preferable because they can significantly accelerate the curing of the composition. Examples of the platinum-based catalyst include fine platinum powder, chloroplatinic acid, alcohol solution of chloroplatinic acid, platinum-alkenylsiloxane complex, platinum-olefin complex, platinum-carbonyl complex, and these platinum-based catalysts in silicone resin, polycarbonate.
- a catalyst dispersed or encapsulated in a thermoplastic resin such as a resin or an acrylic resin is exemplified, and a platinum-alkenylsiloxane complex is particularly preferable.
- the alkenyl siloxane includes 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, Examples thereof include alkenylsiloxanes in which a part of the methyl groups of these alkenylsiloxanes are substituted with ethyl groups, phenyl groups and the like, and alkenylsiloxanes in which the vinyl groups of these alkenylsiloxanes are substituted with allyl groups, hexenyl groups and the like.
- 1,3-divinyl-1,1,3,3-tetramethyldisiloxane is preferable because the platinum-alkenylsiloxane complex has good stability.
- a fine particle platinum-containing hydrosilylation reaction catalyst dispersed or encapsulated with a thermoplastic resin may be used.
- a non-platinum-based metal catalyst such as iron, ruthenium, or iron / cobalt may be used as the catalyst for promoting the hydrosilylation reaction.
- the addition amount of the catalyst for hydrosilylation reaction is a catalytic amount, and the amount is such that the metal atom is within the range of 0.01 to 500 ppm and within the range of 0.01 to 100 ppm in mass unit with respect to the component (A). It is preferable that the amount be in the range of 0.01 to 50 ppm.
- the curable organopolysiloxane composition according to the present invention preferably further contains (D) a functional filler.
- the functional filler is preferably one or more selected from a reinforcing filler, a heat conductive filler and a conductive filler, and particularly when the composition of the present invention is used as a protective agent or an adhesive. It is preferable to contain a reinforcing filler.
- the particle size of the fine powder of these functional fillers is not particularly limited, but is, for example, in the range of 0.01 ⁇ m to 10 ⁇ m in median size (hereinafter simply referred to as “average particle size”) measured by laser diffraction scattering particle size distribution measurement. It is preferably within.
- the composition of the present invention is suitable for precision application in a region having a diameter of 1000 ⁇ m or less, it is preferable that the functional filler having a large particle size is not included.
- the average particle size includes one of the concepts of the average primary particle size and the secondary particle size depending on the type of the functional filler, but particularly in the reinforcing filler, the average primary particle size is It is preferably within the above range.
- the reinforcing filler is a component for imparting mechanical strength to the silicone rubber cured product obtained by curing the composition and improving the performance as a protective agent or an adhesive.
- a reinforcing filler include fumed silica fine powder, precipitated silica fine powder, calcined silica fine powder, fumed titanium dioxide fine powder, quartz fine powder, calcium carbonate fine powder, diatomaceous earth fine powder, and oxidation.
- Inorganic fillers such as aluminum fine powder, aluminum hydroxide fine powder, zinc oxide fine powder, zinc carbonate fine powder and carbon black can be mentioned. These inorganic fillers can be used as organoalkoxysilanes such as methyltrimethoxysilane and trimethyl.
- Organohalosilanes such as chlorosilanes, organosilazanes such as hexamethyldisilazane, ⁇ , ⁇ -silanol group-blocked dimethylsiloxane oligomers, ⁇ , ⁇ -silanol group-blocked methylphenylsiloxane oligomers, ⁇ , ⁇ -silanol group-blocked methylvinylsiloxane oligomers Siloxane oligos, etc. It may contain surface-treated inorganic filler by treating agent such as chromatography.
- a low degree of polymerization organopolysiloxane having silanol groups at both ends of the molecular chain preferably ⁇ , ⁇ -silanol group-capped dimethylpolysiloxane having no reactive functional group other than the terminal silanol groups in the molecule.
- (D1) a reinforcing filler having an average primary particle diameter in the range of 0.01 to 0.5 ⁇ m, particularly organosilazane, which has been subjected to any of the above surface treatments. It is preferable to use fine silica powder that has been treated with, etc., and has an average primary particle diameter in the range of 0.01 to 0.30 ⁇ m.
- the content of the reinforcing filler is not limited, but is preferably in the range of 0.1 to 20.0 parts by mass, and 1.0 to 15.0 parts by mass, relative to 100 parts by mass of the above-mentioned organopolysiloxane. Parts, and the range of 2.0 to 10.0 parts by mass is particularly preferable from the effect of improving the viscosity at a strain rate of 0.1 (1 / s). Further, from the viewpoint of the mixability of the component (D), a part or all of the component (D) is kneaded in advance with the above-mentioned component (A) to obtain the component (D), the component (A) and the component (D).
- At least a part of the component (A) is preferably the organopolysiloxane having a silicon atom-bonded aromatic functional group, which is the component (A1).
- the thermally conductive filler or the electrically conductive filler is a component that imparts thermal conductivity or electrical conductivity to the silicone rubber cured product obtained by curing the composition, if desired, and includes gold, silver, nickel and copper.
- Fine powder of metal such as; fine powder of metal such as gold, silver, nickel, copper deposited or plated on the surface of fine powder of ceramic, glass, quartz, organic resin, etc .; metal compound such as aluminum oxide, aluminum nitride, zinc oxide , And mixtures of two or more thereof.
- Particularly preferred is silver powder, aluminum powder, aluminum oxide powder, zinc oxide powder, aluminum nitride powder or graphite.
- the composition is preferably a metal oxide powder or a metal nitride powder, and particularly, an aluminum oxide powder, a zinc oxide powder, or an aluminum nitride powder. Preferably there is.
- the composition according to the present invention preferably contains (E) one or more kinds of adhesion promoters, and specifically, one or more kinds of adhesion promoters selected from the following component components (e1) to (e4). It is preferable to include. By containing these components, excellent initial adhesion to unwashed aluminum die cast and resin materials, even when used in a harsh environment, further improved adhesive durability and adhesive strength, This makes it possible to maintain the reliability and durability of electric and electronic parts for a long period of time.
- (E1) A reaction mixture of an amino group-containing organoalkoxysilane and an epoxy group-containing organoalkoxysilane (e2) having at least two alkoxysilyl groups in one molecule and having a silicon-oxygen bond between the silyl groups.
- An organic compound containing a bond of (E3) General formula: R a n Si (OR b ) 4-n (In the formula, R a is a monovalent epoxy group-containing organic group, and R b is an alkyl group having 1 to 6 carbon atoms or a hydrogen atom.
- N is a number in the range of 1 to 3.
- a partial hydrolysis-condensation product (e4) thereof containing a vinyl group-containing siloxane oligomer (including chain or cyclic structure) and an epoxy group-containing trialkoxysilane containing a vinyl group-containing siloxane oligomer (including chain or cyclic structure) and an epoxy group-containing trialkoxysilane.
- Component (e1) is a reaction mixture of an amino group-containing organoalkoxysilane and an epoxy group-containing organoalkoxysilane.
- component (e1) is a component for imparting initial adhesiveness to various base materials that are in contact with each other during curing, especially low-temperature adhesiveness to an unwashed adherend. Further, depending on the curing system of the curable composition containing the present adhesion promoter, it may also act as a crosslinking agent.
- Such a reaction mixture is disclosed in JP-B-52-8854 and JP-A-10-195085.
- alkoxysilane having an amino group-containing organic group which constitutes the component (e1) examples include aminomethyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and 3-aminopropylmethyldimethoxy.
- An example is 3-anilinopropyltriethoxysilane.
- epoxy group-containing organoalkoxysilane 3-glycidoxyprolyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- ( An example is 3,4-epoxycyclohexyl) ethylmethyldimethoxysilane.
- the molar ratio of the alkoxysilane having an amino group-containing organic group to the alkoxysilane having an epoxy group-containing organic group is preferably in the range of (1: 1.5) to (1: 5), It is particularly preferable that it is in the range of (1: 2) to (1: 4).
- This component (e1) is easily synthesized by mixing the above-mentioned alkoxysilane having an amino group-containing organic group and an alkoxysilane having an epoxy group-containing organic group and reacting them at room temperature or under heating. be able to.
- R 4 is an alkylene group or an alkyleneoxyalkylene group
- R 5 is a monovalent hydrocarbon group
- R 6 is an alkyl group
- R 7 is an alkylene group
- R 8 is an alkyl group
- It is an alkenyl group or an acyl group
- a is 0, 1, or 2.
- Is a group selected from the group consisting of groups represented by and R 3 is the same or different hydrogen atom or alkyl group.
- R 3 is the same or different hydrogen atom or alkyl group.
- ⁇ It is particularly preferable to contain a carbasilatrane derivative represented by An example of such a carbasilatrane derivative is a silatrane derivative having an alkenyl group and a silicon atom-bonded alkoxy group in one molecule represented by the following structure.
- the component (e2) is an organic compound having at least two alkoxysilyl groups in one molecule and having a bond other than a silicon-oxygen bond between the silyl groups, and the component (e2) alone has initial adhesiveness. In addition to the improvement, it functions to improve the adhesion durability of the cured product containing the present adhesion promoter under severe conditions, especially when used in combination with the above-mentioned components (e1) and (e3).
- component (e2) has the following general formula: (In the formula, R C is a substituted or unsubstituted alkylene group having 2 to 20 carbon atoms, R D is independently an alkyl group or an alkoxyalkyl group, and R E is independently a monovalent hydrocarbon group. And b is each independently 0 or 1.) is preferable.
- component (e2) various compounds are commercially available as reagents and products, and if necessary, they can be synthesized by a known method such as a Grignard reaction or a hydrosilylation reaction. For example, it can be synthesized by a known method in which a disilyl is hydrosilylated with a trialkoxysilane or an organodialkoxysilane.
- R E is an alkyl group such as a methyl group, an ethyl group and a propyl group; an alkenyl group such as a vinyl group and an allyl group; a monovalent hydrocarbon group exemplified by an aryl group such as a phenyl group, and a lower alkyl group. Is preferred.
- R D is an alkyl group such as a methyl group, an ethyl group or a propyl group; an alkoxyalkyl group such as a methoxyethyl group, and preferably has 4 or less carbon atoms.
- R C is a substituted or unsubstituted alkylene group, a linear or branched alkylene group is used without limitation, and a mixture thereof may be used. From the viewpoint of improving the adhesiveness, a straight chain and / or branched chain alkylene group having 2 to 20 carbon atoms is preferable, and a straight chain and / or branched chain alkylene group having 5 to 10 carbon atoms, particularly, the number of carbon atoms. Hexylene of 6 is preferred.
- the unsubstituted alkylene group is a butylene group, a pentylene group, a hexylene group, a heptylene group, an octylene group, a nonylene group, a decylene group or a branched chain product thereof, and its hydrogen atom is a methyl group, an ethyl group, a propyl group, a butyl group. It may be substituted with a cyclopentyl group, a cyclohexyl group, a vinyl group, an allyl group, a 3,3,3-trifluoropropyl group or a 3-chloropropyl group.
- component (e2) examples include bis (trimethoxysilyl) ethane, 1,2-bis (trimethoxysilyl) ethane, 1,2-bis (triethoxysilyl) ethane, 1,2-bis (methyldimethoxy).
- 1,6-bis (trimethoxysilyl) hexane 1,6-bis (triethoxysilyl) hexane, 1,4-bis (trimethoxysilyl) hexane, 1,5-bis ( Trimethoxysilyl) hexane, 2,5-bis (trimethoxysilyl) hexane, 1-methyldimethoxysilyl-6-trimethoxysilylhexane, 1-phenyldiethoxysilyl-6-triethoxysilylhexane, 1,6-bis
- An example is (methyldimethoxysilyl) hexane.
- the component (e3) has the general formula: R a n Si (OR b ) 4-n (In the formula, R a is a monovalent epoxy group-containing organic group, and R b is an alkyl group having 1 to 6 carbon atoms or a hydrogen atom. N is a number in the range of 1 to 3.)
- the epoxy group-containing silane represented by or a partial hydrolysis-condensation product thereof which improves the initial adhesiveness by itself, and in particular, is used in combination with the above-mentioned component (e1) and component (e2) to give the present adhesion promoter. It functions to improve the adhesion durability of the cured product containing it under severe conditions such as immersion in salt water.
- the component (e3) is one of the constituents of the component (e1), it does not react with the component (e1) which is a reaction product (typically, a carbasilatrane derivative which is a cyclized reaction product). It is necessary for the mass ratio to be within a specific range from the viewpoint of the technical effect of the invention, and it is necessary to add it as a component separate from the component (e1).
- Such epoxy group-containing silanes include 3-glycidoxyprolyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3 , 4-epoxycyclohexyl) ethylmethyldimethoxysilane.
- the component (e4) is an adhesion promoter having an epoxysiloxy unit represented by R 1 SiO 3/2 (R1 is an epoxy group) and a vinylsiloxy unit in the molecule, and is described in JP-A No. 01-085224. It is an ingredient.
- adhesion promoters include epoxy group-containing trialkoxysilanes such as 3-glycidoxyprolyltrimethoxysilane, and chain vinyl group-containing siloxane oligomers having hydroxyl groups (silanol groups) at both ends of the molecular chain or tetramethyltetravinyl. It can be obtained by subjecting a cyclic vinyl group-containing siloxane oligomer such as cyclotetrasiloxane to a hydrolysis reaction in the presence of an alkali compound (see the above patent document).
- the compounding amount of the (E) adhesion promoter is not limited, but it is preferable that the mass of the (E) adhesion promoter, which is the sum of the above components (e1) to (e4), be the curable organopolysiloxane composition.
- the content may be in the range of 0.1 to 20% by mass, preferably 0.3 to 10% by mass, and particularly preferably 0.5 to 5.0% by mass.
- the composition of the present invention preferably further contains a hydrosilylation reaction inhibitor.
- the hydrosilylation reaction inhibitor is a component for suppressing the hydrosilylation reaction of the curable organopolysiloxane composition of the present invention, and specifically, for example, an acetylene type such as ethynylcyclohexanol, an amine type, Examples thereof include carboxylic acid ester-based and phosphorous acid ester-based reaction inhibitors.
- the addition amount of the reaction inhibitor is usually 0.001 to 5% by mass based on the whole silicone composition.
- the curable organopolysiloxane composition according to the present invention is suitable for use in a form in which it is applied by precision coating from a nozzle having a diameter of 1000 ⁇ m or less by a fine droplet coating device such as a jet dispenser.
- the component (F) is composed of (F1) an acetylene-based hydrosilylation reaction inhibitor and (F2) a cycloalkenylsiloxane-based hydrosilylation reaction.
- It may be a mixture of inhibitors, especially ethynylcyclohexanol, and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetra A combination of methyl-1,3,5,7-tetrahexenylcyclotetrasiloxane is preferred.
- the composition of the present invention comprises the above-mentioned components (A) to (F), optionally other cross-linking agent and hydrosilylation reaction inhibitor, and is a curable organopolysiloxane composition and a cured product thereof. From the viewpoint of improving heat resistance, it is preferable to further contain (G) a heat resistance imparting agent.
- the component (G) is not particularly limited as long as it can impart heat resistance to the composition of the present invention and a cured product thereof, and examples thereof include iron oxide, titanium oxide, cerium oxide, magnesium oxide, aluminum oxide and zinc oxide.
- Examples thereof include metal oxides, metal hydroxides such as cerium hydroxide, phthalocyanine compounds, carbon black, cerium silanolates, cerium fatty acid salts, and reaction products of organopolysiloxanes and cerium carboxylates.
- a phthalocyanine compound for example, an additive selected from the group consisting of a metal-free phthalocyanine compound and a metal-containing phthalocyanine compound disclosed in Japanese Patent Publication No. 2014-503680 is preferably used, and a metal-containing phthalocyanine is preferably used.
- copper phthalocyanine compounds are particularly suitable.
- One example of the most suitable and non-limiting heat resistance imparting agent is 29H, 31H-phthalocyaninato (2-)-N29, N30, N31, N32 copper.
- Such phthalocyanine compounds are commercially available, for example, Stan-tone TM 40SP03 from PolyOne Corporation (Avon Lake, Ohio, USA).
- the blending amount of such a component (G) may be in the range of 0.01 to 5.0% by mass of the entire composition, 0.05 to 0.2% by mass, 0.07 to 0% by mass. It may be in the range of 1% by mass.
- the curable organopolysiloxane composition of the present invention may contain optional components as long as the object of the present invention is not impaired.
- the optional component include trifunctional alkoxy such as methyltrimethoxysilane, methyltriethoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, vinyltrimethoxysilane, and phenyltrimethoxysilane as an optional crosslinking agent component.
- Silanes tetrafunctional alkoxysilanes such as tetramethoxysilane and tetraethoxysilane; and partially hydrolyzed condensates thereof may be included.
- the present composition is an organic solvent such as toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, hexane and heptane; an organopolysiloxane containing no silicon atom-bonded hydrogen atoms and silicon atom-bonded alkenyl groups, a cold resistance imparting agent, Examples thereof include flame retardancy-imparting agents, pigments and dyes.
- the curable organopolysiloxane composition of the present invention is, if desired, one kind of other known adhesiveness-imparting agents, cationic surfactants, anionic surfactants, nonionic surfactants and the like.
- the above antistatic agent; dielectric filler; electrically conductive filler; releasable component; thixotropic agent; antifungal agent and the like can be included.
- the curable organopolysiloxane composition of the present invention can be prepared by uniformly mixing the above-mentioned components. For example, a part of the component (A) and the component (D) are mixed in advance to form a masterbatch. After that, it can be prepared by mixing the other optional components such as the remaining components (A) to (C), component (E), component (F) and component (G). However, the order of addition during production of the composition is not limited to this.
- the mixing method of each component may be a conventionally known method and is not particularly limited. However, since a uniform mixture is usually formed by simple stirring, mixing using a mixing device is preferable.
- the mixing device is not particularly limited, and examples thereof include a single-screw or twin-screw continuous mixer, a twin roll, a Ross mixer, a Hobart mixer, a dental mixer, a planetary mixer, a kneader mixer, and a Henschel mixer.
- the curable organopolysiloxane composition of the present invention is preferably used as a one-component type (including one-component type) composition.
- Each component of the composition is put in a single storage container, and a jet dispenser or the like is used. It can be used by the fine droplet coating device.
- these packages can be selected as desired according to a curing method, a coating means, and an application target described later, and are not particularly limited.
- the pattern manufacturing method includes a step of preparing a base material.
- the base material may be a substantially flat or solid substrate having undulations / irregularities associated with circuit arrangement, etc., and the material thereof is not particularly limited, but metal such as aluminum, iron, zinc, copper, magnesium alloy, epoxy resin, acrylic Examples thereof include resins, plastics such as ABS, PA, PBT, PC, PPS and SPS, and glass.
- the thickness of the base material is not particularly limited, but may be 0.1 to 10 mm.
- the method for applying the curable polyorganosiloxane composition is not particularly limited, but in order to utilize the advantages of the present invention, it is preferable to apply the curable polyorganosiloxane composition onto the above-mentioned substrate using a fine droplet coating device.
- Examples of the fine droplet coating device that can be used in the present invention include an inkjet coating system and a dispenser coating system.
- the curable polyorganosiloxane composition of the present invention is coated by a dispenser coating system.
- the dispenser coating method includes an air type, a valve type, a screw type, a volume type, and a jet type dispenser, and the jet dispenser is preferable from the viewpoint of fine pattern coating.
- the jet dispenser includes an air valve system, a solenoid system, and a piezo system, and the piezo system is preferable from the viewpoint of applying a fine pattern.
- the size and weight of one-shot droplet of the curable polyorganosiloxane composition discharged by the fine droplet discharge device can be designed by selecting the fine droplet coating device and discharge conditions. Can be 50 ⁇ g or less, 30 ⁇ g or less, 25 ⁇ g or less, and depending on the device, even a droplet amount of 10 ⁇ g, which is a minute amount, can be designed.
- the coating amount of the curable portion and the landing position of the droplets of the curable portion can be precisely controlled, and a high-density pattern (that is, the curable polyorganosiloxane composition). Cured product) can be formed.
- these fine droplet applying devices are provided with a nozzle for ejecting the composition in a droplet form.
- the diameter of the coating nozzle is not particularly limited, but for the purpose of performing precise dot coating, the nozzle diameter needs to be 1000 ⁇ m or less, preferably 50 to 200 ⁇ m, and preferably 100 to 150 ⁇ m. Is particularly preferable.
- the curable polyorganosiloxane composition of the present invention has improved fluidity at high shear, if the coating nozzle diameter is 50 ⁇ m or more, stable droplet coating can be performed, and the coating nozzle diameter is If it is 200 ⁇ m or less, there is an advantage that a larger amount of liquid droplets can be applied in a short time, and the liquid droplets apparently have a sharp decrease in fluidity from the moment of ejection, and thus the viscosity increases, Enables precision coating.
- the dispensing frequency is not particularly limited, but 1 ms / shot to 10 s / shot is preferable, and 1 ms / shot to 10 ms / shot is preferable.
- the moving speed of the nozzle is not particularly limited, but is preferably 1 to 300 mm / sec, more preferably 50 to 100 mm / sec. However, the dispensing frequency and the moving speed of the nozzle can be appropriately set according to the device and the purpose.
- the curable polyorganosiloxane composition of the present invention is applied onto a substrate using the above-mentioned fine droplet coating device to form a pattern including fine dot-like or linear application regions on the substrate. It is possible.
- Each of the coating areas forming the pattern is a dot-like or linear shape, and is a fine area. Therefore, the coating area within the frame having a length and width of 1000 ⁇ m (particularly within a frame having a diameter of 1000 ⁇ m or less It is preferably a circular region) or a linear region having a line width of 1000 ⁇ m or less. Since the curable polyorganosiloxane composition of the present invention is particularly suitable for forming a precise pattern, each coating area falls within a frame having a diameter of 800 ⁇ m or less depending on the selection of a fine droplet coating device and discharge conditions.
- the pattern may be a substantially circular area, a linear area having a line width of 800 ⁇ m or less, or a combination thereof.
- the coating area can be designed to be a substantially circular area within a frame of 5 to 500 ⁇ m, a linear area having a line width of 5 to 500 ⁇ m, or a pattern composed of a combination thereof. is there.
- the interval between the coating regions can be designed arbitrarily, but may be 5.0 mm or less, or may be designed to be in the range of 0.5 to 4.5 mm.
- Each coating area forming the pattern is formed from droplets discharged from the fine droplet coating apparatus, and the thickness thereof is not particularly limited, and the type and application of the fine droplet coating apparatus such as a jet dispenser. It can be designed as appropriate.
- the coating thickness per droplet (one shot) may be in the range of 1 to 1000 ⁇ m, more preferably 1 to 500 ⁇ m, particularly preferably 1 to 300 ⁇ m.
- the curable polyorganosiloxane composition of the present invention apparently behaves as if the discharged droplets suddenly lose their fluidity and increase in viscosity, they can be precisely coated in multiple layers in the same coating area. Even if it does not scatter or flow out (spread), it has an advantage that the coating thickness of the composition can be easily adjusted by forming multiple layers. For example, it is possible to accurately form a portion where the curable organopolysiloxane is applied in multiple layers (appearing as a physically raised application area) by continuously performing shots on one application area. It is possible.
- the present composition is useful for manufacturing electronic parts, image display devices and the like having the above patterns, and can be used, for example, in a method for forming a dam material in the manufacture of electronic parts and the like.
- the dam material is used to form a frame in the display part or the protection part of the electronic component or the image display device, and by applying the sealant in the frame, the sealant may be projected from the display part or the like. Can be prevented.
- the curable polyorganosiloxane composition of the present invention is a one-pack type composition, and a cured system containing a hydrosilylation reaction is selected to form a cured product easily in a short time. Therefore, there is an advantage that the yield and production efficiency in industrial production of these electronic parts, image display devices, etc. can be improved.
- the curable organopolysiloxane composition applied to the above region is cured by a means such as heating to form a cured product.
- the purpose of applying the curable organopolysiloxane composition or a cured product thereof is arbitrary, but in the case of semiconductor members, one or more purposes selected from protection, sealing, sealing and coating of electronic components or their precursors. Is preferably formed. For example, semiconductor chips, protection of electrodes or wiring, sealing of semiconductor chips and electrodes, sealing of gaps and gaps of electronic parts, coating of these are specific applications, protection using the above fine pattern, Preference is given to sealing, sealing and coating.
- the fine pattern made of the cured product on the substrate can be widely used for industrial production of electronic parts, image display devices, MEMS devices and the like. Further, the cured product can be used in a wide temperature range of ⁇ 70 ° C. to room temperature, and even if it is used at a low temperature such as ⁇ 70 ° C., the elasticity of the cured product does not significantly change, so that it has excellent cold resistance. When used for these electronic parts and the like, there is an advantage that the reliability and low temperature durability can be further improved.
- the curable organopolysiloxane composition according to the present invention is preferably cured by a hydrosilylation reaction to form an organopolysiloxane cured product.
- the temperature condition for curing the hydrosilylation reaction-curable silicone composition is not particularly limited, but is usually in the range of 20 ° C to 200 ° C, and more preferably in the range of 20 to 180 ° C. If desired, it may be cured at a high temperature in a short time, and a cured product is easily formed in a short time, so that the yield and production efficiency in industrial production of these electronic parts, image display devices, MEMS devices, etc. can be improved. There are advantages. However, if desired, the composition may be cured at a low temperature such as room temperature for a long time (for example, several hours to several days), and is not particularly limited.
- the curable organopolysiloxane composition of the present invention can form a fine pattern of the cured product on the substrate by forming the pattern on the substrate and then curing it under desired curing conditions. It can be widely used for industrial production of electronic parts, image display devices and the like.
- the curable organopolysiloxane composition of the present invention can be applied to at least a partial region to provide an electronic component or a precursor thereof having a structure to which the composition or a cured product thereof is applied. That is, in the electronic component or the precursor thereof according to the present invention, it is sufficient that the curable polyorganosiloxane composition described above is applied to at least a part of the area, and the applied area forms the pattern. Is particularly preferable.
- the electronic component or its precursor may be a known semiconductor device such as a diode, a transistor, a thyristor, a monolithic IC, a hybrid IC, an LSI, a VLSI or the like, or a precursor thereof, and in particular, a MEMS device or a precursor thereof.
- the MEMS device is a generic term for semiconductor devices formed by using a semiconductor microfabrication technology generally called Micro Electro Mechanical Systems, and includes an inertial sensor such as an acceleration sensor or an angular velocity sensor equipped with a MEMS chip, or an image sensor. It may be a display device or the like.
- a precursor of a semiconductor device or the like is a general term for unfinished electronic components before being completed as a semiconductor device by subsequent die bonding of a chip or the like by wiring, placement of chips, heating, etc. It is a concept that includes general electronic component members that are distributed and exported / imported in a state before finishing.
- An electronic component or a precursor thereof according to the present invention is obtained by a method for producing an electronic component or a precursor thereof, which comprises at least a step of applying the above-mentioned curable organopolysiloxane composition using a fine droplet coating device.
- the application conditions and application areas are as described above, and in particular, the area to which the curable organopolysiloxane is applied is a substantially circular area within a frame having a diameter of 500 ⁇ m or less, and a linear shape having a line width of 500 ⁇ m or less.
- the pattern composition composed of regions or a combination thereof may be the above-mentioned pattern, and it is particularly preferable that the fine droplet coating device is a jet dispenser having a discharge port having a nozzle diameter of 50 to 200 ⁇ m.
- the method for producing an electronic component or a precursor thereof of the present invention in addition to the above steps, if desired, a wafer protective film forming step or a wiring processing step to a semiconductor substrate, a chip and electrode connecting step, a polishing step. It goes without saying that the treatment step and a part or all of the sealing step may be included at desired timing.
- the electronic component or the precursor thereof according to the present invention may be a known semiconductor device such as a diode, a transistor, a thyristor, a monolithic IC, a hybrid IC, an LSI or a VLSI or a precursor thereof, and in particular, a MEMS device or a precursor thereof.
- the MEMS device is a general term for a semiconductor device formed by using a semiconductor microfabrication technique generally called Micro Electro Mechanical Systems, and includes an inertial sensor such as an acceleration sensor or an angular velocity sensor equipped with a MEMS chip, or a magnetic sensor.
- Environmental sensors such as sensors, pressure sensors, microphones, gas, humidity, particles, image sensors, actuators using MEMS technology, such as optical system actuators such as auto focus and micro mirrors, wireless communication components, micro speakers, images It may be a display device or the like.
- a precursor of a semiconductor device or the like is a general term for unfinished electronic components before being completed as a semiconductor device by subsequent die bonding of a chip or the like by wiring, placement of chips, heating, etc. It is a concept that includes general electronic component members that are distributed and exported / imported in a state before finishing.
- the cured product obtained by curing the curable organopolysiloxane composition according to the present invention can be used in a wide temperature range from ⁇ 70 ° C.
- A6 A dimethylvinylsiloxy group-capped dimethylpolysiloxane / methylphenylpolysiloxane copolymer having a molecular chain at both ends and having a viscosity of 2,000 mPas at 20 ° C.
- B2 Methylhydrogensiloxane / dimethylsiloxane copolymer capped with trimethylsiloxy groups at both molecular chain terminals and having a viscosity of 30 mPas at 20 ° C.
- C1 Platinum having a platinum concentration of 0.6% by mass and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex
- D1 Master batch of 80% by mass of the above A3 component and 20% by mass of silazane-treated dry silica (average primary particle diameter measured by laser diffraction / scattering method: 0.1 to 0.2 ⁇ m)
- D2 Master batch of 70% by mass of the above A6 component and 30% by mass of silazane-treated dry silica (average primary particle diameter measured by laser diffraction / scattering method: 0.1 to 0.2 ⁇ m)
- E1 Condensation reaction product of methyl vinyl siloxane oligomer having a viscosity of 30 mPa ⁇ s with hydroxyl groups blocked at both ends of the molecular chain and 3-glycidoxypropyltrimethoxysilane in a mass ratio of 1: 1.
- F1 e
- the test regarding the technical effect of the present invention was conducted as follows.
- [viscosity] The viscosity (Pa ⁇ s) of the composition at 25 ° C. was measured using a rheometer MCR-102 manufactured by Anton Paar. The geometry uses a 20 mm diameter, 2 degree cone type, pre-share: 10 (1 / s), 60 s, equilibration time (stop time after pre-share): 60 s, strain rate from 0.05 (1 / s) to 5000 (1 / s), the strain rate increase rate was increased at 120 s / decade and measured.
- Hardness of cured product The hardness of the cured product of the composition was measured using a type A durometer specified in JIS K6253.
- the compositions of Examples 1 and 2 meet the requirements of the invention. That is, the viscosity at a strain rate of 1,000 (1 / s) is sufficiently low at 2.0 Pa ⁇ s or less, and the viscosity at a strain rate of 0.1 (1 / s) is at a strain rate of 1,000 (1 / s).
- the compositions of Examples 1 and 2 can be precisely coated in a range of an average coating diameter of 800 ⁇ m or less by using a jet dispenser which is a fine droplet coating device.
- the composition had a content of silicon atom-bonded aromatic functional groups (phenyl groups) derived from the raw materials A6 and D1 components within the range specified by the present application, and the cured product had a G * at ⁇ 70 ° C. of 25. It is 10 times or less of G * at 0 ° C, that is, no rapid change in elastic modulus is observed from the ultralow temperature range to the room temperature. Therefore, the cured product has good cold resistance and can be used in a wide temperature range. It could be confirmed.
- the content of the silicon atom-bonded aromatic functional group in the composition was 0% by mass, and when using the jet dispenser which is a fine droplet coating device, the average coating diameter was 800 ⁇ m or less.
- the G * at -70 ° C of the cured product is 100 times or more than the G * at 25 ° C, and unlike Example 1 or Example 2, curing It was impossible to realize the cold resistance of the product.
- the cured product of Comparative Example 1 showed a sharp change in G * at around -50 ° C. It was confirmed that the cold resistance at temperatures below °C was insufficient.
- the composition of Comparative Example 2 had an excessive content of the silicon atom-bonded aromatic functional group (phenyl group) derived from the raw material A6 and D1 components, and was able to achieve a certain cold resistance.
- the viscosity at a strain rate of 1,000 (1 / s) is 2.0 Pa ⁇ s or more, and the viscosity at a strain rate of 0.1 (1 / s) is the viscosity at a strain rate of 1,000 (1 / s). Since it was less than 50.0 times, stable jetting could not be performed and precise coating could not be performed when using a jet dispenser which is a fine droplet coating device.
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Abstract
Description
ジオメトリ:直径20mm、2度コーン型
プレシェア:10 (1/s)、60s
温度:25℃一定
平衡化時間(プレシェア後停止時間):60s
ひずみ速度分散:0.05 (1/s)から5000 (1/s)まで
ひずみ速度増加率:120s/decade
(B)オルガノハイドロジェンポリシロキサン:成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量、
(C)触媒量のヒドロシリル化反応用触媒、
(D)レーザー回折・散乱法により測定される平均粒子径が0.01~10μmの機能性充填剤 2.5~20.0質量部、
(E)1種類以上の接着促進剤、および
(F)ヒドロシリル化反応抑制剤
を含有してなり、(A)成分または(B)成分の少なくとも一部がケイ素原子結合芳香族官能基を有するオルガノポリシロキサンである硬化性オルガノポリシロキサン組成物であってよい。特に、(A)成分の一部が、(A1)25℃における粘度が10~100,000mPa・sであり、ケイ素原子結合芳香族官能基を2.0~25.0質量%の範囲で含有するアルケニル基含有オルガノポリシロキサンであることが好ましい。また、低ひずみ速度領域での高粘度および低い流動性の観点から、前記の成分(D)が、(D1)平均一次粒子径が0.01~0.5μmの範囲にある補強性充填剤を少なくとも有してもよい。また、特に、ノズル詰まりを防止する見地から、前記の成分(F)が、(F1)アセチレン系のヒドロシリル化反応抑制剤および(F2)シクロアルケニルシロキサン系のヒドロシリル化反応抑制剤の混合物であってもよい。
本発明にかかる硬化性オルガノポリシロキサン組成物は、微細液滴塗布装置等からの吐出のためにシェアがかけられると組成物の流動性が上昇し、ノズル等からスムーズな吐出が可能であるが、一旦ノズル等から吐出され、当該組成物が吐出時のシェアから開放されると、その流動性が大きく低下し、高粘度になるという巨視的なレオロジー特性を有する。すなわち、本組成物は、微細液滴塗布装置等によるスムーズな吐出が可能でありながら、吐出から基材への適用までに流動性を急激に失って高粘度の液滴となり、目的とする点状の塗布領域から飛散ないし広がり(流出)が抑制されるものである。さらに、本発明にかかる硬化性オルガノポリシロキサン組成物は、組成物中にケイ素原子結合芳香族官能基を一定量含有するため、硬化物中に芳香族官能基に由来する異種の分子配列がランダムに導入される。この結果、ケイ素原子結合芳香族官能基をほとんど含まない場合や、大量に含む結果として、硬化物の主たる分子構造がケイ素原子結合芳香族官能基である場合に比べ、-70℃等の低温においても硬化物の弾性率の変化が抑制され、耐寒性が改善されるとともに、当該硬化性オルガノポリシロキサン組成物またはその硬化物を備える電子部品の信頼性および低温耐久性が改善される。
(A)25℃における粘度が10~100,000mPa・sであるアルケニル基含有オルガノポリシロキサン 100質量部、
(B)オルガノハイドロジェンポリシロキサン:成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量、
(C)触媒量のヒドロシリル化反応用触媒、
(D)レーザー回折・散乱法により測定される平均粒子径が0.01~10μmの機能性充填剤 2.5~20.0質量部、
(E)1種類以上の接着促進剤、および
(F)ヒドロシリル化反応抑制剤
を含有してなり、(A)成分または(B)成分の少なくとも一部がケイ素原子結合芳香族官能基を有するオルガノポリシロキサンである硬化性オルガノポリシロキサン組成物である。当該組成物は、さらに、(G)耐熱性付与剤を含有してもよい
成分(A)であるアルケニル基含有オルガノポリシロキサンは、本組成物の主剤であり、25℃における粘度が10~100,000mPa・sの範囲内である。ここで、「25℃における粘度」とは、回転粘時計等により成分(A)単独で測定される動粘度である。また、成分(A)の少なくとも一部は、(A1)25℃における粘度が10~100,000mPa・sであり、ケイ素原子結合芳香族官能基を2.0~25.0質量%の範囲で含有するアルケニル基含有オルガノポリシロキサンであることが好ましい。
で表されるアルコキシシリル含有基を有しても良い。これらの官能基を有するオルガノポリシロキサンは、未硬化状態における組成物の増粘を抑制し、かつ分子中にアルコキシシリル基を有するため、成分(D)の表面処理剤としても機能する。このため、得られる組成物の増粘やオイルブリードが抑制され、取扱作業性が損なわれないという恩恵を得られる場合がある。
成分(B)は、本発明の組成物の主たる架橋剤であり、好適には分子内に2個以上のケイ素原子結合水素原子を有するオルガノハイドロジェンポリシロキサンが特に制限なく利用できる。なお、本発明組成物を硬化して得られる硬化物の柔軟性の見地から、オルガノハイドロジェンポリシロキサンの構造および分子中のケイ素原子結合水素原子の個数(平均値)を設計してよい。例えば、得られるオルガノポリシロキサン硬化物の柔軟性や部材からの剥離性に優れ、修繕・再利用等のリペア性を改善する見地から、少なくとも2個を分子鎖側鎖に有する直鎖状のオルガノハイドロジェンポリシロキサンを鎖長延長剤として利用してもよく、硬度の高い硬化物を得る目的で、側鎖に多数のケイ素原子結合水素原子オルガノハイドロジェンポリシロキサンを架橋剤として用いてもよく、これらを併用してもよい。また、成分(B)の一部は、分子内に2個以上のケイ素原子結合水素原子を有し、かつ、ケイ素原子結合芳香族官能基を有するオルガノハイドロジェンポリシロキサンであってよい。特に、本発明の硬化性オルガノポリシロキサン組成物が上記の成分(A)~(F)からなる組成物であって、成分(A)中に十分なケイ素原子結合芳香族官能基が含まれない場合には、成分(B)が十分なケイ素原子結合芳香族官能基を有することが、耐寒性の改善のために必要になる。ただし、成分(A)中に十分なケイ素原子結合芳香族官能基を含む場合、成分(B)は、ケイ素原子結合芳香族官能基を含まないオルガノハイドロジェンポリシロキサンであってよい。
本発明の組成物は、成分(B)について、少なくとも成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~50モルの範囲でよく、0.2~30モルの範囲でよく、0.2~10、0.2~5モルとなる量の範囲であってよい。
ヒドロシリル化反応用触媒としては、白金系触媒、ロジウム系触媒、パラジウム系触媒が例示され、本組成物の硬化を著しく促進できることから白金系触媒が好ましい。この白金系触媒としては、白金微粉末、塩化白金酸、塩化白金酸のアルコール溶液、白金-アルケニルシロキサン錯体、白金-オレフィン錯体、白金-カルボニル錯体、およびこれらの白金系触媒を、シリコーン樹脂、ポリカーボネート樹脂、アクリル樹脂等の熱可塑性樹脂で分散あるいはカプセル化した触媒が例示され、特に、白金-アルケニルシロキサン錯体が好ましい。このアルケニルシロキサンとしては、1,3-ジビニル-1,1,3,3-テトラメチルジシロキサン、1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン、これらのアルケニルシロキサンのメチル基の一部をエチル基、フェニル基等で置換したアルケニルシロキサン、これらのアルケニルシロキサンのビニル基をアリル基、ヘキセニル基等で置換したアルケニルシロキサンが例示される。特に、この白金-アルケニルシロキサン錯体の安定性が良好であることから、1,3-ジビニル-1,1,3,3-テトラメチルジシロキサンであることが好ましい。加えて、取扱作業性および組成物のポットライフの改善の見地から、熱可塑性樹脂で分散あるいはカプセル化した微粒子状の白金含有ヒドロシリル化反応触媒を用いてもよい。なお、ヒドロシリル化反応を促進する触媒としては、鉄、ルテニウム、鉄/コバルトなどの非白金系金属触媒を用いてもよい。
本発明に係る硬化性オルガノポリシロキサン組成物は、さらに、(D)機能性充填剤を含有することが好ましい。当該機能性充填剤は補強性充填剤、熱伝導性充填剤および導電性充填剤から選ばれる1種類以上であることが好ましく、特に、本発明組成物を保護剤または接着剤用途で使用する場合には、補強性充填剤を含有することが好ましい。また、これらの機能性充填剤の微粉末の粒子径は、特に限定されないが、例えばレーザー回折散乱式粒度分布測定によるメジアン径(以下、単に「平均粒子径」)で0.01μm~10μmの範囲内であることが好ましい。本発明組成物は直径1000μm以下の領域に精密塗布することに適することから、大粒子径の機能性充填剤を含まないことが好ましい。なお、平均粒子径は機能性充填剤の種類に応じて平均一次粒子径と二次粒子径のいずれかの概念を包摂するものであるが、特に補強性充填剤においては、平均一次粒子径が上記範囲にあることが好ましい。
本発明に係る組成物は、(E)1種類以上の接着促進剤を含むことが好ましく、具体的には、以下の成分成分(e1)~(e4)から選ばれる1種類以上の接着促進剤を含むことが好ましい。これらの成分を含有することで、未洗浄のアルミダイキャストや樹脂材料への初期接着性に優れ、過酷な環境下で使用した場合であっても、接着耐久性と接着強度にさらに改善され、電気・電子部品の信頼性・耐久性を長期間に渡って維持することを可能とするものである。
(e1) アミノ基含有オルガノアルコキシシランとエポキシ基含有オルガノアルコキシシランとの反応混合物
(e2) 一分子中に少なくとも二つのアルコキシシリル基を有し,かつそれらのシリル基の間にケイ素-酸素結合以外の結合が含まれている有機化合物、
(e3) 一般式:
Ra nSi(ORb)4-n
(式中、Raは一価のエポキシ基含有有機基であり、Rbは炭素原子数1~6のアルキル基または水素原子である。nは1~3の範囲の数である)
で表されるエポキシ基含有シランまたはその部分加水分解縮合物
(e4) ビニル基含有シロキサンオリゴマー(鎖状または環状構造のものを含む)とエポキシ基含有トリアルコキシシランとの反応混合物
で表される基からなる群から選択される基であり、R3は同じかまたは異なる水素原子もしくはアルキル基である。}
で表されるカルバシラトラン誘導体を含有することが特に好ましい。このようなカルバシラトラン誘導体として、以下の構造で表される1分子中にアルケニル基およびケイ素原子結合アルコキシ基を有するシラトラン誘導体が例示される。
Ra nSi(ORb)4-n
(式中、Raは一価のエポキシ基含有有機基であり、Rbは炭素原子数1~6のアルキル基または水素原子である。nは1~3の範囲の数である)
で表されるエポキシ基含有シランまたはその部分加水分解縮合物であり、単独でも初期接着性を改善するほか、特に前記の成分(e1)および成分(e2)と併用することにより本接着促進剤を含んでなる硬化物に塩水浸漬などの苛酷な条件下での接着耐久性を向上させる働きをする。なお、成分(e3)は、成分(e1)の構成成分の一つであるが、反応物である成分(e1)(典型的には、環化した反応物であるカルバシラトラン誘導体)との質量比が特定の範囲にあることが発明の技術的効果の点から必要であり、成分(e1)とは別個の成分として添加されることが必要である。
本発明の組成物には、その取扱作業性の見地から、さらにヒドロシリル化反応抑制剤を含むことが好ましい。ヒドロシリル化反応抑制剤は、本発明の硬化性オルガノポリシロキサン組成物のヒドロシリル化反応を抑制するための成分であって、具体的には、例えば、エチニルシクロヘキサノールのようなアセチレン系、アミン系、カルボン酸エステル系、亜リン酸エステル系等の反応抑制剤が挙げられる。反応抑制剤の添加量は、通常、シリコーン組成物全体の0.001~5質量%である。特に、シリコーン組成物の取扱作業性を向上させる目的では、3-メチル-1-ブチン-3-オール、3,5-ジメチル-1-ヘキシン-3-オール、3-フェニル-1-ブチン-3-オール等のアセチレン系化合物;3-メチル-3-ペンテン-1-イン、3,5-ジメチル-3-ヘキセン-1-イン等のエンイン化合物;1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン、1,3,5,7-テトラメチル-1,3,5,7-テトラヘキセニルシクロテトラシロキサン等のシクロアルケニルシロキサン;ベンゾトリアゾール等のトリアゾール化合物等が特に制限なく使用することができる。
本発明組成物は、前記の成分(A)~(F)、任意で他の架橋剤およびヒドロシリル化反応抑制剤を含んでなるものであるが、硬化性オルガノポリシロキサン組成物およびその硬化物の耐熱性改善の見地から、さらに、(G)耐熱性付与剤を含有することが好ましい。成分(G)として、本発明の組成物およびその硬化物に耐熱性を付与できるものならば特に限定されないが、例えば、酸化鉄、酸化チタン、酸化セリウム、酸化マグネシウム、酸化アルミニウム、酸化亜鉛等の金属酸化物、水酸化セリウム等の金属水酸化物、フタロシアニン化合物、カーボンブラック、セリウムシラノレ-ト、セリウム脂肪酸塩、オルガノポリシロキサンとセリウムのカルボン酸塩との反応生成物等が挙げられる。特に好適には、フタロシアニン化合物であり、例えば、特表2014-503680号公報に開示された無金属フタロシアニン化合物及び金属含有フタロシアニン化合物からなる群より選択される添加剤が好適に用いられ、金属含有フタロシアニン化合物のうち、銅フタロシアニン化合物が特に好適である。最も好適かつ非限定的な耐熱性付与剤の一例は、29H,31H-フタロシアニナト(2-)-N29,N30,N31,N32銅である。このようなフタロシアニン化合物は市販されており、例えば、PolyOne Corporation(Avon Lake,Ohio,USA)のStan-tone(商標)40SP03がある。
本発明の硬化性オルガノポリシロキサン組成物は、上記した成分以外にも、本発明の目的を損なわない範囲で任意成分を配合することができる。この任意成分としては、例えば、任意の架橋剤成分として、メチルトリメトキシシラン、メチルトリエトキシシラン、エチルトリメトキシラン、エチルトリエトキシシラン、ビニルトリメトキシシラン、フェニルトリメトキシシラン等の3官能性アルコキシシラン;テトラメトキシシラン、テトラエトキシシラン等の4官能性アルコキシシラン;およびこれらの部分加水分解縮合物を含んでも良い。さらに、本組成物は、トルエン、キシレン、アセトン、メチルエチルケトン、メチルイソブチルケトン、ヘキサン、ヘプタン等の有機溶剤;ケイ素原子結合水素原子およびケイ素原子結合アルケニル基を含有しないオルガノポリシロキサン、耐寒性付与剤、難燃性付与剤、顔料、染料等が挙げられる。また、本発明の硬化性オルガノポリシロキサン組成物は、所望により、その他の公知の接着性付与剤、カチオン系界面活性剤、アニオン系界面活性剤、または非イオン系界面活性剤などからなる1種類以上の帯電防止剤;誘電性フィラー;電気伝導性フィラー;離型性成分;チクソ性付与剤;防カビ剤などを含むことができる。
本発明の硬化性オルガノポリシロキサン組成物は、上記の各成分を均一に混合することにより調製でき、例えば、事前に成分(A)の一部と成分(D)を混合してマスターバッチを形成した後、残りの成分(A)~(C)、成分(E)、成分(F)並びに成分(G)等の他の任意の成分を混合することにより調製できる。ただし、本組成物の製造時における添加の順序はこれに限定されるものではない。
本発明の硬化性オルガノポリシロキサン組成物は、一成分型(一液型を含む)の組成物として用いることが好ましく、組成物の各構成成分を単一の保存容器に入れて、ジェットディスペンサー等の微細液滴塗布装置により使用することができる。なお、これらのパッケージは、後述する硬化方法や塗布手段、適用対象に応じて所望により選択することができ、特に制限されない。
パターンの製造方法は、基材を準備する工程を含む。基材は略平坦または回路配置等に伴う起伏/凹凸を備えた固体基板であってよく、その材質は特に限定されないが、アルミニウム、鉄、亜鉛、銅、マグネシウム合金等の金属、エポキシ樹脂、アクリル樹脂、ABS、PA、PBT、PC、PPS、SPS等のプラスチック、及びガラスが挙げられる。なお、基材の厚みは特に制限されないが、0.1~10mmであってよい。
硬化性ポリオルガノシロキサン組成物を適用する方法は、特に限定されないが、本発明の利点を活用するためには、微細液滴塗布装置を用いて上記基材上に適用することが好ましい。
本発明の硬化性ポリオルガノシロキサン組成物は、上記の微細液滴塗布装置を用いて基材上に適用することにより、基材上に微細な点状または線状の塗布領域を含むパターンを形成可能である。
本組成物は、上記のパターンを備えた電子部品、画像表示装置等の製造に有用であり、例えば、電子部品等の製造において、ダム材を形成するための方法に用いることができる。ダム材は、電子部品や画像表示装置の表示部又は保護部に枠を形成するために用いられ、この枠内に封止剤を適用することにより、封止剤が、表示部等からはみ出したりすることを防止することができる。ここで、本発明の硬化性ポリオルガノシロキサン組成物は、一液型の組成物であり、ヒドロシリル化反応を含む硬化系を選択した組成にすることによって、短時間かつ容易に硬化物を形成することから、これらの電子部品、画像表示装置等の工業的生産における歩留まりと生産効率を改善できる利点がある。
前記の領域に塗布された硬化性オルガノポリシロキサン組成物は加熱等の手段により硬化して硬化物を形成する。当該硬化性オルガノポリシロキサン組成物またはその硬化物を適用する目的は任意であるが、半導体部材においては、電子部品またはその前駆体の保護、封止、シールおよび被覆から選ばれる1種類以上の目的で形成されていることが好ましい。例えば、半導体チップ、電極または配線の保護、半導体チップや電極の封止、電子部品の間隙やギャップのシール、これらの被覆等が具体的な用途であり、上記の細密なパターンを用いた保護、封止、シールおよび被覆を意図していることが好ましい。基材上の当該硬化物からなる微細なパターンは、電子部品、画像表示装置、MEMSデバイス等の工業的生産に広く利用可能である。また、当該硬化物は、-70℃~室温の幅広い温度範囲で使用することができ、特に-70℃等の低温で使用しても硬化物の弾性が大きく変化しないことから耐寒性に優れ、これらの電子部品等に使用した場合に、その信頼性および低温耐久性をさらに改善できる利点がある。
本発明にかかる硬化性オルガノポリシロキサン組成物は、好適にはヒドロシリル化反応により硬化して、オルガノポリシロキサン硬化物を形成する。このヒドロシリル化反応硬化型のシリコーン組成物を硬化するための温度条件は、特に限定されないが、通常20℃~200℃の範囲内であり、より好ましくは20~180℃の範囲内である。所望により、高温短時間で硬化させてもよく、短時間かつ容易に硬化物を形成することから、これらの電子部品、画像表示装置、MEMSデバイス等の工業的生産における歩留まりと生産効率を改善できる利点がある。ただし、所望により、上記組成物を室温等の低温で長時間(例えば数時間~数日)かけて硬化させてもよく、特に制限されるものではない。
本発明の硬化性オルガノポリシロキサン組成物は、少なくとも一部の領域に適用することで、当該組成物またはその硬化物が適用された構造を備える電子部品またはその前駆体を提供することができる。すなわち、本発明にかかる電子部品またはその前駆体は、上記の硬化性ポリオルガノシロキサン組成物がその少なくとも一部の領域に適用されていればよく、適用された領域が前記のパターンを形成することが特に好ましい。
本発明にかかる電子部品またはその前駆体は、上記の硬化性オルガノポリシロキサン組成物を、微細液滴塗布装置を用いて適用する工程を少なくとも備える、電子部品またはその前駆体の製造方法により得ることができる。その適用条件や適用領域等は前記のとおりであり、特に、当該硬化性オルガノポリシロキサンを適用する領域が、直径500μm以下の枠内に収まる略円状の領域、線幅500μm以下の線状の領域またはこれらの組み合わせから構成されたパターン組成物を前記のパターンであってよく、微細液滴塗布装置はノズル径50~200μmの吐出口を備えたジェットディスペンサーであることが特に好ましい。また、本発明の電子部品またはその前駆体の製造方法は、上記の工程に加えて、所望により、ウェハの保護膜形成工程や半導体基材への配線処理工程、チップと電極の接続工程、研磨処理工程や一部又は全部の封止工程などを所望のタイミングで含めてよいことはいうまでもない。
本発明にかかる電子部品またはその前駆体は、ダイオード、トランジスタ、サイリスタ、モノリシックIC、ハイブリッドIC、LSI、VLSI等の公知の半導体装置またはその前駆体であってよく、特に、MEMSデバイスまたはその前駆体であってよい。ここで、MEMSデバイスとは、一般的にMicro Electro Mechanical Systemsと呼ばれる半導体微細加工技術を用いて形成された半導体装置の総称であり、MEMSチップを備えた加速度センサや角速度センサなどの慣性センサ、磁気センサ、圧力センサ、マイクロフォン、ガス、湿度、パーティクルなどの環境センサ、画像センサ、またMEMS技術を用いたアクチュエータ類、例えばオートフォーカスやマイクロミラー等の光学系アクチュエータ、無線通信用部品、マイクロスピーカー、画像表示装置等であってよい。また、半導体装置等の前駆体とは、その後の配線やチップの配置、加熱等によるチップ等のダイボンディングにより半導体装置として完成する以前の未完成の電子部品の総称であり、配線やチップの搭載といった仕上げ前の状態で流通し、輸出入される電子部品用部材一般を含む概念である。本発明にかかる硬化性オルガノポリシロキサン組成物を硬化させてなる硬化物は、-70℃~室温の幅広い温度範囲で使用することができ、特に-70℃等の低温で使用しても硬化物の弾性が大きく変化しないことから耐寒性に優れ、これらの電気。電子機器に使用した場合に、その信頼性および低温耐久性をさらに改善できる利点がある。
<硬化性オルガノポリシロキサン組成物の成分>
A1: 20℃における粘度が粘度60mPasである、両末端ジメチルビニル基封鎖した直鎖状ポリジメチルシロキサン(ビニル基の含有量=1.5質量%)
A2: 20℃における粘度が粘度400mPasである、両末端ジメチルビニル基封鎖した直鎖状ポリジメチルシロキサン(ビニル基の含有量=0.44質量%)
A3: 20℃における粘度が粘度2000mPasである、両末端ジメチルビニル基封鎖した直鎖状ポリジメチルシロキサン(ビニル基の含有量=0.23質量%)
A4: 粘度2,000mPasの分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン(ビニル基の含有量=0.23質量%)65質量%、SiO4/2 単位と(CH3 )3 SiO1/2 単位と(CH3 )2(CH2 =CH)SiO1/2 単位からなるオルガノポリシロキサンレジン(ビニル基の含有量=2.5質量%)35質量%からなるシリコーンレジンポリシロキサン混合物
A5: 粘度190mPasのSiO4/2 単位と(CH3 )3 SiO1/2 単位と(CH3 )2(CH2 =CH)SiO1/2 単位からなるオルガノポリシロキサンレジン(ビニル基の含有量=5.1質量%)
A6: 20℃における粘度が粘度2,000mPasである、分子鎖両末端ジメチルビニルシロキシ基封鎖ジメチルポリシロキサン・メチルフェニルポリシロキサン共重合体(ビニル基の含有量=0.26質量%、フェニル基の含有量=8.9質量%)
B1: 20℃における粘度が60mPasである、分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体(ケイ素原子結合水素原子の含有量=0.7質量%)
B2: 20℃における粘度が30mPasである、分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンシロキサン・ジメチルシロキサン共重合体(ケイ素原子結合水素原子の含有量=0.13質量%)
B3:20℃における粘度が20mPa・sである、分子鎖両末端トリメチルシロキシ基封鎖メチルハイドロジェンポリシロキサン(ケイ素原子結合水素原子の含有量=1.55質量%)
C1: 白金濃度が0.6質量%である白金と1,3-ジビニル-1,1,3,3-テトラメチルジシロキサンの錯体
D1: 上記のA3成分80質量%とシラザン処理乾式シリカ(レーザー回折・散乱法で測定された平均一次粒子径:0.1~0.2μm)20質量%のマスターバッチ
D2: 上記のA6成分70質量%とシラザン処理乾式シリカ(レーザー回折・散乱法で測定された平均一次粒子径:0.1~0.2μm)30質量%のマスターバッチ
E1: 粘度30mPa・sの分子鎖両末端水酸基封鎖メチルビニルシロキサンオリゴマーと3-グリシドキシプロピルトリメトキシシランとの質量比1:1の縮合反応物
F1:エチニルシクロヘキサノール
F2:1,3,5,7-テトラメチル-1,3,5,7-テトラビニルシクロテトラシロキサン
前記の各成分を下の表1に記載の質量比(質量部)で、成分(C1)以外の各成分を均一に混合し、最後に成分(C1)を表1に記載の質量比(質量部)で混合し、真空脱泡後にムサシエンジニアリング製10ccシリンジに充填して、実施例1~2および比較例1~2の組成物を得た。
[粘度]
組成物の25℃における粘度(Pa・s)を、アントンパール社製レオメータMCR-102を用いて測定した。ジオメトリは直径20mm、2度コーン型を用い、プレシェア:10 (1/s)、60s、平衡化時間(プレシェア後停止時間):60sを経て、ひずみ速度を0.05 (1/s)から5000 (1/s)まで、ひずみ速度増加率を120s/decadeで上昇させて測定した。各組成物の粘度の測定結果および、ひずみ速度0.1(1/s)における粘度をひずみ速度1,000(1/s)における粘度を除した値を「チクソ指数」として、表1に併せて示す。
組成物の硬化物の硬さは、JIS K 6253に規定されたタイプAデュロメータを用いて測定した。
組成物を150℃で60分間加熱硬化させて得た硬化物を、アントンパール社製レオメータMCR-302を用いて測定した。-100℃から100℃まで3℃/分で昇温しながら弾性率を測定し、-70℃と25℃における複素せん断弾性率(以下、G*と略す)の値を得た。ここで、[(-70℃におけるG*(G*1))/(25℃におけるG*(G*2))]が10以下である場合に耐寒性合格と判定し、-70℃と25℃におけるG*の値と併せて、表1に示す。
各組成物のジェットディスペンサーによる塗布試験は、武蔵エンジニアリング製の下表2の装置構成を有する装置を用いて、基材は20mm x 20mmのシリコンチップに1.4mmの間隔で7X7ドット(実施例1~2)のパターンで塗布を行った。同様に、6X6ドット(比較例1)のパターンで塗布を行った。塗布時の平均塗布径(μm)および1ショットあたりの平均塗布量(質量、μg)を表1に示す。なお、上記の「チクソ指数」が50未満では、ジェットディスペンサーによる塗布試験を行うことができなかったので、「ディスペンス不可」とした。
表1に示すとおり、実施例1および2の組成物は本発明の要件を満たすものである。すなわちひずみ速度1,000(1/s)における粘度が2.0Pa・s以下と十分に低く、かつ、ひずみ速度0.1(1/s)における粘度が、ひずみ速度1,000(1/s)における粘度の50.0倍以上の値(=チクソ指数)となり、ディスペンス後の流動性が低く制御された硬化性オルガノポリシロキサン組成物である。当該実施例1および2の組成物は、表1および図1、図2に示したとおり、微細液滴塗布装置であるジェットディスペンサーを用いて、平均塗布径800μm以下の範囲に精密な塗布が可能である。さらに、当該組成物は原料のA6およびD1成分に由来するケイ素原子結合芳香族官能基(フェニル基)の含有量が本願所定の範囲内にあり、該硬化物の-70℃におけるG*が25℃におけるG*の10倍以下であり、すなわち超低温領域から室温においても急激な弾性率変化が認められないことから、硬化物の耐寒性は良好であり、幅広い温度領域で使用可能であることが確認できた。
Claims (15)
- ひずみ速度1,000(1/s)における粘度が2.0Pa・s以下であり、かつ、ひずみ速度0.1(1/s)における粘度が、ひずみ速度1,000(1/s)における粘度の50.0倍以上の値となることを特徴とし、かつ、
組成物中のケイ素原子結合芳香族官能基の含有量が1.0~6.0質量%の範囲である硬化性オルガノポリシロキサン組成物。 - ひずみ速度1,000(1/s)における粘度が1.5Pa・s以下であり、かつ、ひずみ速度0.1(1/s)における粘度が、50Pa・s以上の値となることを特徴とする、請求項1に記載の硬化性オルガノポリシロキサン組成物。
- (A)25℃における粘度が10~100,000mPa・sであるアルケニル基含有オルガノポリシロキサン 100質量部、
(B)オルガノハイドロジェンポリシロキサン:成分(A)に含まれるアルケニル基1モルに対して、成分(B)中のケイ素原子結合水素原子が0.2~5モルとなる量、
(C)触媒量のヒドロシリル化反応用触媒、
(D)レーザー回折・散乱法により測定される平均粒子径が0.01~10μmの機能性充填剤 2.5~20.0質量部、
(E)1種類以上の接着促進剤、および
(F)ヒドロシリル化反応抑制剤
を含有してなり、(A)成分または(B)成分の少なくとも一部がケイ素原子結合芳香族官能基を有するオルガノポリシロキサンである、請求項1または請求項2に記載の硬化性オルガノポリシロキサン組成物。 - (A1)25℃における粘度が10~100,000mPa・sであり、ケイ素原子結合芳香族官能基を2.0~25.0質量%の範囲で含有するアルケニル基含有オルガノポリシロキサンを少なくとも含む、請求項1~請求項3のいずれか1項に記載の硬化性オルガノポリシロキサン組成物。
- 前記の成分(D)が、(D1)平均一次粒子径が0.01~0.5μmの範囲にある補強性充填剤を少なくとも有する、請求項3に記載の硬化性オルガノポリシロキサン組成物。
- 前記の成分(F)が、(F1)アセチレン系のヒドロシリル化反応抑制剤および(F2)シクロアルケニルシロキサン系のヒドロシリル化反応抑制剤の混合物である、請求項3に記載の硬化性オルガノポリシロキサン組成物。
- パターン形成用途に用いられる一液型の硬化性オルガノポリシロキサン組成物である、請求項1~請求項6のいずれか1項に記載の硬化性オルガノポリシロキサン組成物。
- パターンが、縦横の長さが1000μmの枠内に収まる塗布領域または線幅1000μm以下の線状の領域である硬化性オルガノポリシロキサン組成物の塗布領域の組み合わせを少なくとも含む、請求項7に記載の硬化性オルガノポリシロキサン組成物。
- 微細液滴塗布装置により適用される一液型の硬化性オルガノポリシロキサン組成物である、請求項1~請求項6のいずれか1項に記載の硬化性オルガノポリシロキサン組成物。
- 請求項1~請求項6のいずれか1項に記載の硬化性オルガノポリシロキサン組成物を微細液滴塗布装置を用いて基材上に適用することを特徴とする、パターンの形成方法。
- 前記のパターンが、硬化性オルガノポリシロキサン組成物を、ノズル径が1000μm以下の微細液滴塗布装置を用いて、縦横の長さが1000μmの枠内に収まる塗布領域または線幅1000μm以下の線状の領域に適用してなる塗布領域、またはそれらの組み合わせを少なくとも含む、請求項10に記載のパターンの形成方法。
- 少なくとも一部の領域に、請求項1~請求項6のいずれか1項に記載の硬化性オルガノポリシロキサン組成物またはその硬化物が適用された構造を備える、電子部品またはその前駆体。
- 請求項1~請求項6のいずれか1項に記載の硬化性オルガノポリシロキサン組成物が、微細液滴塗布装置を用いて適用された構造を備える、請求項12の電子部品またはその前駆体。
- 電子部品が半導体装置である、請求項12または請求項13に記載の電子部品またはその前駆体。
- 電子部品が、MEMS(micro electro mechanical systems)デバイスである、請求項12または請求項13に記載の電子部品またはその前駆体。
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JP7432519B2 (ja) | 2024-02-16 |
TWI825200B (zh) | 2023-12-11 |
EP3868833A4 (en) | 2022-07-20 |
KR20210080433A (ko) | 2021-06-30 |
US20210371659A1 (en) | 2021-12-02 |
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