WO2020022485A1 - 硬化性フィルム状接着剤及びデバイスの製造方法 - Google Patents
硬化性フィルム状接着剤及びデバイスの製造方法 Download PDFInfo
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- WO2020022485A1 WO2020022485A1 PCT/JP2019/029444 JP2019029444W WO2020022485A1 WO 2020022485 A1 WO2020022485 A1 WO 2020022485A1 JP 2019029444 W JP2019029444 W JP 2019029444W WO 2020022485 A1 WO2020022485 A1 WO 2020022485A1
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- film adhesive
- compound
- adhesive
- curable film
- film
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/06—Polyethylene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/26—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers modified by chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
- C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C09J201/06—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
Definitions
- the present invention can be cured at a low temperature, and gives a cured product having excellent transparency, a curable film adhesive used for a member constituting a sensor device, and curing of the curable film adhesive.
- the present invention relates to a method for manufacturing a device, which includes a step of causing a device to be manufactured.
- ⁇ ⁇ ⁇ ⁇ ⁇ Various sensors are built into portable electronic devices such as portable personal computers and smartphones.
- portable electronic devices have a built-in brightness sensor for detecting the amount of external light (environmental light) and a proximity sensor (sensor chip) for detecting a detection target in a non-contact state.
- Patent Literature 1 discloses that (i) a sensor chip having a surface having a sensor region in which a plurality of pixels are formed is mounted face-up on the upper surface of a wiring board, and then a plurality of locations on the surface of the sensor chip are mounted. Forming a plurality of adhesive first spacers on the surface of the sensor chip by arranging a first adhesive on the surface of the sensor chip, and (ii) forming a paste-like paste on the surface of the sensor chip.
- the first optical component having the light shielding layer in which the plurality of optical regions are formed is applied to the first optical component via the plurality of first spacers and the second adhesive while applying a load to the first optical component. (Iii) thereafter, fixing the first optical component by curing the second adhesive without applying a load to the first optical component.
- the method of manufacturing a semiconductor device which is described. According to this document, an ultraviolet-curing adhesive is applied to a sensor chip, an optical component is disposed thereon, and the adhesive is irradiated with ultraviolet light while holding the optical component with a bonding tool. A method of curing an optical component and bonding the optical component on the sensor chip is also described. Furthermore, this document also describes that the adhesive used must have translucency.
- the present invention has been made in view of such a viewpoint, can be cured at a low temperature, and provides a cured product having excellent transparency, a curable film adhesive used for a member constituting a sensor device, It is another object of the present invention to provide a method for manufacturing a device using the curable film adhesive.
- the present inventors have conducted intensive studies to solve the above problems, and as a result, a compound having a cyclic ether group, a polymer component, and an imidazole compound having a reaction activation temperature of 125 ° C or lower or a reaction activation temperature of 160 ° C or lower.
- a curable film adhesive containing a curing agent containing a certain thermal cationic polymerization initiator can be cured at a low temperature, and gives a cured product having excellent transparency.
- the present inventors have found that the present invention can be preferably used for bonding constituent parts, and have completed the present invention.
- [1] Contains a compound having a cyclic ether group, a polymer component, and at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C. or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower.
- at least one reaction activation temperature selected from an imidazole compound having a reaction activation temperature of 125 ° C or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C or lower is 100 ° C or higher;
- the curable film adhesive according to 1).
- the curing agent has as a main component at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C. or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower.
- a curable film adhesive which can be cured at a low temperature and provides a cured product having excellent transparency and is used for a member constituting a sensor device, and the curable film adhesive A method for manufacturing a device using the same is provided.
- Curable film adhesive The present invention relates to a compound having a cyclic ether group, a polymer component, an imidazole compound having a reaction activation temperature of 125 ° C or lower, and a thermal cationic polymerization having a reaction activation temperature of 160 ° C or lower.
- curable refers to physical properties that are cured by heating to a predetermined temperature to give a cured product.
- “Film-like” means that the adhesive of the present invention has a film shape or a sheet shape.
- the film-like adhesive of the present invention may be in a strip shape (label shape) or a long shape (shape that can be wound up in a roll shape).
- the curable film adhesive of the present invention contains a compound having a cyclic ether group. Since the compound having a cyclic ether group is excellent in compatibility with the polymer component described later, by using this, it is possible to obtain a film adhesive excellent in film forming property and sheet processability under a normal temperature environment. it can.
- the normal temperature environment refers to an environment of 20 ° C. ⁇ 15 ° C. (5-35 ° C.) (JIS Z 8703).
- the compound having a cyclic ether group refers to a compound having at least one or more cyclic ether groups in a molecule.
- the cyclic ether group include an oxirane group (epoxy group), an oxetane group (oxetanyl group), a tetrahydrofuryl group, and a tetrahydropyranyl group.
- an oxirane group or an oxetane group can be obtained from the viewpoint that a film-like adhesive excellent in film formability and sheet processability under a normal temperature environment, and a cured product of the film adhesive excellent in adhesive strength can be obtained.
- a compound having two or more oxirane groups or oxetane groups in the molecule is particularly preferable.
- a phenoxy resin described later is not included.
- Examples of the compound having an oxirane group in a molecule include an aliphatic epoxy compound (excluding an alicyclic epoxy compound), an alicyclic epoxy compound, and an aromatic epoxy compound.
- Examples of the aliphatic epoxy compound include monofunctional epoxy compounds such as a glycidyl etherified product of an aliphatic alcohol and a glycidyl ester of an alkyl carboxylic acid; Examples include polyfunctional epoxy compounds such as aliphatic polyhydric alcohols, polyglycidyl etherified alkylene oxide adducts thereof, polyglycidyl esters of aliphatic long-chain polybasic acids, and epoxy compounds having a triazine skeleton.
- Typical examples of these aliphatic epoxy compounds include allyl glycidyl ether, butyl glycidyl ether, 2-ethylhexyl glycidyl ether, C12-13 mixed alkyl glycidyl ether, 1,4-butanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.
- Glycidyl ether triglycidyl ether of glycerin, triglycidyl ether of trimethylolpropane, tetraglycidyl ether of sorbitol, hexaglycidyl ether of dipentaerythritol, diglycidyl ether of polyethylene glycol, diglycidyl ether of polypropylene glycol, dicyclopentadiene dimethanol
- Glycidyl ether of polyhydric alcohol such as diglycidyl ether, or propylene glycol, Trimethylolpropane, polyglycidyl ethers of polyether polyols obtained by adding one or more alkylene oxides to aliphatic polyhydric alcohols such as glycerin, diglycidyl esters of aliphatic long chain dibasic acid; Monoglycidyl ethers of higher aliphatic alcohols and glycidyl esters of higher fatty acids, e
- a commercial item can also be used as an aliphatic epoxy compound.
- Commercially available products include Denacol EX-121, Denacol EX-171, Denacol EX-192, Denacol EX-211, Denacol EX-212, Denacol EX-313, Denacol EX-314, Denacol EX-321, Denacol EX-411, Denacol EX-421, Denacol EX-512, Denacol EX-521, Denacol EX-611, Denacol EX-612, Denacol EX-614, Denacol EX-622, Denacol EX-810, Denacol EX-811, Denacol EX-850, Denacol EX-851, Denacol EX-821, Denacol EX-830, Denacol EX-832, Denacol EX-841, Denacol EX-861, Denacol EX-911, Denacol EX-941, DE Call EX-920, Denacol EX-931 (
- the alicyclic epoxy compound is obtained by epoxidizing a polyglycidyl etherified product of a polyhydric alcohol having at least one or more alicyclic structure, or a compound containing a cyclohexene ring or a cyclopentene ring with an oxidizing agent. Cyclohexene oxide and cyclopentene oxide-containing compounds are exemplified.
- Representative compounds of these alicyclic epoxy compounds include hydrogenated bisphenol A diglycidyl ether, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate, and 3,4-epoxy-1-methylcyclohexyl -3,4-epoxy-1-methylhexanecarboxylate, 6-methyl-3,4-epoxycyclohexylmethyl-6-methyl-3,4-epoxycyclohexanecarboxylate, 3,4-epoxy-3-methylcyclohexylmethyl -3,4-epoxy-3-methylcyclohexanecarboxylate, 3,4-epoxy-5-methylcyclohexylmethyl-3,4-epoxy-5-methylcyclohexanecarboxylate, bis (3,4-epoxycyclohexylmethyl) adipate , 3,4-epoxy-6-methylcyclohexanecarboxylate, methylenebis (3,4-e
- commercially available products can be used as the alicyclic epoxy compound.
- examples of commercially available products include Celloxide 2021P, Celloxide 2081, Celloxide 2000, Celloxide 3000 (all manufactured by Daicel), YX8000, YX8034 (all manufactured by Mitsubishi Chemical), and the like.
- aromatic epoxy compound examples include phenols having at least one aromatic ring, such as phenol, cresol and butylphenol, and mono / polyglycidyl etherified products of alkylene oxide adducts thereof.
- aromatic epoxy compounds include bisphenol A, bisphenol F, or a glycidyl etherified product of a compound obtained by further adding an alkylene oxide thereto, or an epoxy novolak resin; Mono / polyglycidyl etherified products of aromatic compounds having two or more phenolic hydroxyl groups, such as resorcinol, hydroquinone, and catechol; Glycidyl etherified aromatic compounds having two or more alcoholic hydroxyl groups such as phenyldimethanol, phenyldiethanol and phenyldibutanol; Glycidyl esters of polybasic acid aromatic compounds having two or more carboxylic acids such as phthalic acid, terephthalic acid and trimellitic acid, glycidyl esters of
- aromatic epoxy compound a commercial product can be used as the aromatic epoxy compound.
- Commercially available products include Denacol EX-146, Denacol EX-147, Denacol EX-201, Denacol EX-203, Denacol EX-711, Denacol EX-721, Oncoat EX-1020, Oncoat EX-1030, Oncoat EX -1040, Oncoat EX-1050, Oncoat EX-1051, Oncoat EX-1010, Oncoat EX-1011, Oncoat 1012 (all manufactured by Nagase ChemteX Corporation); Oxol PG-100, Oxol EG-200, Ogsol EG-210, Ogsol EG-250 (all manufactured by Osaka Gas Chemical Co.); HP4032, HP4032D, HP4700 (all manufactured by DIC); ESN-475V (all manufactured by Nittetsu Chemical &Materials); JER (old) Epicoat) YX 800, YL980 (manufactured by Mitsubishi Chemical
- Compounds having an oxetane group in the molecule include 3,7-bis (3-oxetanyl) -5-oxa-nonane, 1,4-bis [(3-ethyl-3-oxetanylmethoxy) methyl] benzene, 2-bis [(3-ethyl-3-oxetanylmethoxy) methyl] ethane, 1,3-bis [(3-ethyl-3-oxetanylmethoxy) methyl] propane, ethylene glycol bis (3-ethyl-3-oxetanylmethyl) ) Ether, triethylene glycol bis (3-ethyl-3-oxetanylmethyl) ether, tetraethylene glycol bis (3-ethyl-3-oxetanylmethyl) ether, 1,4-bis (3-ethyl-3-oxetanylmethoxy) Bifunctional fats such as butane and 1,6-bis (3-ethyl-3
- a commercially available product can also be used.
- Commercially available products include 2-hydroxyethyl vinyl ether, diethylene glycol monovinyl ether, and 4-hydroxybutyl vinyl ether (all manufactured by Maruzen Petrochemical Co.); Alonoxetane OXT-121, OXT-221, EXOH, POX, OXA, OXT-101, OXT-211, OXT-212 (all, manufactured by Toagosei Co., Ltd.); etanacol OXBP, OXTP (all, manufactured by Ube Industries) and the like.
- compounds having a cyclic ether group compounds having no aromatic ring (aliphatic compound) such as an aliphatic epoxy compound (excluding an alicyclic epoxy compound) and an alicyclic epoxy compound are examples of a film adhesive. It is preferable since coloring can be suppressed and the optical sensor device can be suitably used.
- the molecular weight of the compound having a cyclic ether group is usually from 700 to 5,000, preferably from 1,200 to 4,000.
- the cyclic ether equivalent of the compound having a cyclic ether group is preferably from 100 g / eq to 500 g / eq, more preferably from 150 g / eq to 300 g / eq.
- the content of the compound is preferably 5 to 80% by mass, more preferably 10 to 75% by mass.
- the curable film adhesive of the present invention contains a polymer component in addition to the compound having a cyclic ether group.
- a polymer component By containing the polymer component, it is possible to obtain a film adhesive excellent in sheet processability and a cured product of the film adhesive excellent in adhesive strength. Further, by containing the polymer component, a film adhesive having a desired thickness can be efficiently produced.
- the polymer component is added for the main purpose of imparting sheet shape retention to the film adhesive.
- the weight average molecular weight (Mw) of the polymer component is usually 20,000 or more, and preferably 20,000 to 3,000,000.
- the number average molecular weight (Mn) of the polymer component is preferably from 10,000 to 2,000,000, and more preferably from 20,000 to 1,500,000.
- the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the polymer component can be determined by performing gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent and converting them into standard polystyrene equivalent values.
- the content of the polymer component in the film adhesive is preferably 15 to 90% by mass, more preferably 20 to 85% by mass.
- a polyolefin resin, a modified polyolefin resin, an acrylic polymer, a polyester resin, a phenoxy resin, a polycarbonate, a polyether resin, a polyurethane resin, a polysiloxane, a rubber polymer, or the like can be used.
- These polymer components can be used alone or in combination of two or more.
- a polyolefin resin, a modified polyolefin resin, an acrylic polymer, a polyester resin, and a phenoxy resin are preferable from the viewpoint of compatibility with the compound having a cyclic ether group.
- the polyolefin-based resin is a polymer containing a repeating unit derived from an olefin-based monomer.
- the polyolefin resin may be a polymer composed of only olefin-based monomer-derived repeating units, or a olefin-based monomer-derived repeating unit and a monomer that can be copolymerized with the olefin-based monomer. May be a polymer comprising a repeating unit of
- the olefin monomer is preferably an ⁇ -olefin having 2 to 8 carbon atoms, more preferably ethylene, propylene, 1-butene, isobutylene, or 1-hexene, and still more preferably ethylene or propylene. These olefin monomers can be used alone or in combination of two or more.
- Examples of the monomer copolymerizable with the olefin-based monomer include vinyl acetate, (meth) acrylate, and styrene.
- (meth) acrylic acid represents acrylic acid or methacrylic acid (the same applies hereinafter).
- One of these monomers copolymerizable with the olefin-based monomer can be used alone, or two or more can be used in combination.
- polyolefin resins examples include very low density polyethylene (VLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), Ethylene-propylene copolymer, olefin-based elastomer (TPO), ethylene-vinyl acetate copolymer (EVA), ethylene- (meth) acrylic acid copolymer, ethylene- (meth) acrylic acid ester copolymer, etc.
- VLDPE very low density polyethylene
- LDPE low density polyethylene
- MDPE medium density polyethylene
- HDPE high density polyethylene
- LLDPE linear low density polyethylene
- PP linear low density polyethylene
- Ethylene-propylene copolymer olefin-based elastomer
- EVA ethylene-vinyl acetate copolymer
- EVA ethylene- (meth) acrylic acid copolymer
- the modified polyolefin-based resin is a polyolefin-based resin into which a functional group is introduced, which is obtained by using a polyolefin-based resin as a precursor and subjecting it to a modification treatment using a modifier.
- the modifier used for the modification treatment of the polyolefin resin is a compound having a functional group in the molecule.
- the modified polyolefin resin is suitably used as a polymer component because it promotes the thermal reaction of the cyclic ether compound and improves the curability of the film adhesive at a low temperature.
- Functional groups include carboxyl group, carboxylic anhydride group, carboxylic ester group, hydroxyl group, epoxy group, amide group, ammonium group, nitrile group, amino group, imide group, isocyanate group, acetyl group, thiol group, ether group Thioether group, sulfone group, phosphon group, nitro group, urethane group, alkoxysilyl group, silanol group, halogen atom and the like.
- a carboxyl group, a carboxylic anhydride group, a carboxylic ester group, a hydroxyl group, an ammonium group, an amino group, an imide group, an isocyanate group, and an alkoxysilyl group are preferable, and a carboxyl group, a carboxylic anhydride group, and an alkoxysilyl group are preferable.
- a carboxyl group, a carboxylic anhydride group, and an alkoxysilyl group are particularly preferable.
- the compound having a functional group may have two or more functional groups in the molecule.
- modified polyolefin-based resin examples include an acid-modified polyolefin-based resin and a silane-modified polyolefin-based resin. It is preferable to use an acid-modified polyolefin-based resin as the modified polyolefin-based resin from the viewpoint that the effect of improving the curability of the film adhesive of the present invention at a low temperature is easily obtained.
- an acid-modified polyolefin resin may be used as a polymer component in order to further improve curability at a low temperature. preferable.
- Acid-modified polyolefin-based resin refers to a resin obtained by graft-modifying a polyolefin-based resin with an acid.
- a resin obtained by reacting a polyolefin resin with an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride to introduce a carboxyl group or a carboxylic acid anhydride group (graft modification) may be used.
- Examples of unsaturated carboxylic acids and unsaturated carboxylic anhydrides to be reacted with the polyolefin resin include unsaturated carboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, glutaconic acid, tetrahydrophthalic acid, and aconitic acid; And unsaturated carboxylic anhydrides such as acid, itaconic anhydride, glutaconic anhydride, citraconic anhydride, aconitic anhydride, norbornene dicarboxylic anhydride, and tetrahydrophthalic anhydride. These can be used alone or in combination of two or more. Among these, maleic anhydride is preferred because it is easy to obtain a film adhesive excellent in sheet processability and a cured product of film adhesive excellent in adhesive strength.
- the amount of the unsaturated carboxylic acid (or unsaturated carboxylic anhydride) to be reacted with the polyolefin resin is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 5 parts by mass, based on 100 parts by mass of the polyolefin resin. It is 3 parts by mass, more preferably 0.2 to 1 part by mass.
- the curable film-like adhesive containing the acid-modified polyolefin-based resin thus obtained can easily obtain a cured product excellent in adhesive strength.
- Silane-modified polyolefin-based resin refers to a resin obtained by graft-modifying a polyolefin resin with an unsaturated silane compound.
- the silane-modified polyolefin-based resin has a structure in which a polyolefin resin as a main chain is graft-copolymerized with an unsaturated silane compound as a side chain.
- silane-modified polyethylene resins and silane-modified ethylene-vinyl acetate copolymers can be mentioned, and silane-modified polyethylene resins such as silane-modified low-density polyethylene, silane-modified ultra-low-density polyethylene, and silane-modified linear low-density polyethylene are preferable.
- a vinyl silane compound is preferable.
- the vinylsilane compound include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, vinyltripentyloxysilane, vinyltriphenoxysilane, vinyltribenzyloxysilane, and vinyltribenzyloxysilane. Examples include methylenedioxysilane, vinyltriethylenedioxysilane, vinylpropionyloxysilane, vinyltriacetoxysilane, and vinyltricarboxysilane. These can be used alone or in combination of two or more.
- the conditions for graft-polymerizing the unsaturated silane compound to the polyolefin resin as the main chain may be a conventional method of known graft polymerization.
- the amount of the unsaturated silane compound to be reacted with the polyolefin resin is preferably 0.1 to 10 parts by mass, more preferably 0.3 to 7 parts by mass, and still more preferably 0.5 to 10 parts by mass with respect to 100 parts by mass of the polyolefin resin. To 5 parts by mass.
- a cured product excellent in adhesive strength is easily obtained.
- silane-modified polyolefin resin examples include Linklon (registered trademark) (manufactured by Mitsubishi Chemical Corporation). Among these, low-density polyethylene linkron, linear low-density polyethylene linklon, ultra-low-density polyethylene linklon, and ethylene-vinyl acetate copolymer linklon can be preferably used. .
- the modified polyolefin resin can be used alone or in combination of two or more.
- the acrylic polymer is a polymer containing a repeating unit derived from a (meth) acrylate in the molecule.
- the proportion of the repeating unit derived from the (meth) acrylic acid ester in the acrylic polymer is usually 40% by mass or more, preferably 50% by mass or more, more preferably 60% by mass or more, and particularly preferably, based on all the repeating units. 70% by mass or more.
- the ratio of the repeating unit contained in the acrylic polymer usually corresponds to the ratio (charge ratio) of the monomer capable of forming each repeating unit in all the monomers used for the polymerization of the acrylic polymer. .
- alkyl groups such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate have 1 to 1 carbon atoms.
- Alkyl (meth) acrylate which is 18; cycloalkyl (meth) acrylate, benzyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyloxyethyl (Meth) acrylates having a cyclic skeleton such as (meth) acrylate and imide (meth) acrylate; (meth) acrylates having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate and 2-hydroxypropyl (meth) acrylate Having an amino group such as monoethyl amino (meth) acrylate (meth) acrylic acid esters; acrylic acid ester; N- methylol (meth) having an amide group such as acrylamide (meth) acrylate, and the like.
- (meth) acryl means both acrylic and methacryl.
- a monomer constituting the acrylic polymer a monomer having a carboxyl group such as (meth) acrylic acid, maleic acid, fumaric acid, and itaconic acid in addition to (meth) acrylic acid ester; vinyl acetate And vinyl compounds such as styrene; and ethylene and ⁇ -olefins.
- the acrylic polymer may be crosslinked.
- Crosslinking is a process in which the acrylic polymer before crosslinking has a crosslinkable functional group such as a hydroxyl group, and the crosslinkable functional group is added to the composition for forming the film adhesive by adding a crosslinker. And the functional group of the crosslinking agent react with each other.
- the acrylic polymer By crosslinking the acrylic polymer, the initial adhesive strength and cohesive strength of the film adhesive can be adjusted.
- polyester resin is a polycondensate of a polyvalent carboxylic acid (dicarboxylic acid) and a polyalcohol (diol).
- examples of the polyester resin include polyethylene terephthalate, polyethylene isophthalate, polyethylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, and polylactic acid.
- Phenoxy resins are high molecular weight thermoplastic condensation products of bisphenol A and epichlorohydrin and their derivatives.
- the phenoxy resin is not particularly limited, and includes a bisphenol A skeleton, a bisphenol F skeleton, a bisphenol S skeleton, a bisphenol acetophenone skeleton, a novolak skeleton, a biphenyl skeleton, a fluorene skeleton, a dicyclopentadiene skeleton, a norbornene skeleton, a naphthalene skeleton, and an anthracene.
- a skeleton having one or more skeletons selected from a skeleton, an adamantane skeleton, a terpene skeleton, and a trimethylcycloxane skeleton is exemplified.
- the curing agent of the present invention contains a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower, as a polymer component, a polyolefin resin, an acrylic polymer, a polyester resin, a phenoxy resin, a polycarbonate, a polyether resin It is preferable to use a non-modified polymer component such as polyurethane resin, polysiloxane, and rubber-based polymer.
- a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower it becomes easy to impart sufficient curability at a low temperature to the curable film adhesive. Therefore, the necessity of improving the curability of the film adhesive using a modified polyolefin-based resin or the like is small, and rather, by using a non-modified polymer component, the storage stability of the film adhesive can be improved. it can.
- the curable film adhesive of the present invention comprises, in addition to the compound having a cyclic ether group and the polymer component, an imidazole compound having a reaction activation temperature of 125 ° C. or less and a heat activation compound having a reaction activation temperature of 160 ° C. or less. It contains a curing agent containing at least one selected from cationic polymerization initiators. The curing agent is used for the purpose of adjusting the reaction temperature and the reaction speed of the thermal curing of the film adhesive.
- the curing agent used in the present invention contains at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C.
- the curable film adhesive can be sufficiently cured at a low temperature. That is, by using these compounds as a curing agent, the members constituting the sensor device can be bonded to each other, or the member constituting the sensor device and another member can be bonded without damaging the sensor device with heat. .
- reaction activation temperature means that when a compound used as a curing agent and a general-purpose liquid bisphenol A type epoxy resin are mixed and heated, the mixture is cured to the lowest temperature by a differential scanning calorimeter (DSC). This is the temperature at which the peak of heat generation is confirmed.
- the imidazole compound is measured by mixing a liquid bisphenol A-type epoxy resin and an imidazole compound.
- the thermal cationic polymerization initiator is measured by mixing a liquid bisphenol A type epoxy resin, a thermal cationic polymerization initiator and ⁇ -butyrolactone.
- reaction activation temperature can be measured more specifically by the method described in the Examples.
- At least one selected from the imidazole compound and the thermal cationic polymerization initiator used in the curing agent of the present invention preferably has a reaction activation temperature of 100 ° C. or higher. If the reaction activation temperature of the curing agent is high to some extent, it is possible to suppress the progress of thermal curing due to heat during film formation of the film adhesive (drying of the coating film, hot melt).
- the at least one kind selected from the imidazole compound and the thermal cationic polymerization initiator used in the curing agent of the present invention generally used ones can be widely used as long as the reaction activation temperature is 125 ° C or lower or 160 ° C or lower. Can be.
- the curing agent is preferably one containing as a main component at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C. or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower. That is, the content of the “at least one selected from the group consisting of an imidazole compound having a reaction activation temperature of 125 ° C.
- a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or less” based on the entire curing agent is preferably 70% by mass.
- the content is more preferably 90% by mass or more.
- imidazole compounds having a reaction activation temperature of 125 ° C. or lower include C17Z, 2E4MZ, 2PZ, 2P4MZ, 1B2MZ, 1B2PZ, 2MZ-CN, 2E4MZ-CN, and 2PZ-OK (all manufactured by Shikoku Chemicals). And the like.
- the reaction activation temperature of the imidazole-based compound it is preferable to measure 100 parts by mass of the liquid bisphenol A-type epoxy resin and 5 parts by mass of the imidazole compound.
- Thermal cationic polymerization initiator is a compound capable of generating a cationic species that initiates polymerization by heating.
- the thermal cationic polymerization initiator is not particularly limited, and is appropriately selected depending on the curing conditions and the type of the cationically polymerizable compound.
- thermal cationic polymerization initiator as long as the reaction activation temperature is 160 ° C. or lower, those used for curing can be widely used.
- a sulfonium salt-based compound, a quaternary ammonium salt-based compound, a phosphonium salt-based compound, a diazonium salt-based compound, an iodonium salt-based compound, and the like can be given.
- a sulfonium salt-based compound or a quaternary ammonium salt-based compound is preferable, and a sulfonium salt-based compound is more preferable, from the viewpoint that the sealing sheet can be cured at a low temperature.
- sulfonium salt-based compounds those in which the counter anion is a tetrakis (pentafluorophenyl) borate anion are preferable from the viewpoint of reducing the amount of the thermal cationic polymerization initiator used.
- sulfonium salt-based compounds commercially available products such as San-Aid SI-300, San-Aid SI-360, San-Aid SI-B2A, San-Aid SI-B7, San-Aid SI-B3A, San-Aid SI-B3 (all manufactured by Sanshin Chemical Co., Ltd.), etc. Is mentioned.
- the counter anion is a tetrakis (pentafluorophenyl) borate anion
- 100 parts by mass of a liquid bisphenol A-type epoxy resin and 0.1 part of a thermal cationic polymerization initiator are used.
- the measurement is performed by mixing parts by mass with 0.1 parts by mass of ⁇ -butyrolactone.
- the counter anion is a hexafluorophosphate anion
- the measurement is performed by mixing 100 parts by mass of a liquid bisphenol A type epoxy resin, 2 parts by mass of a thermal cationic polymerization initiator, and 2 parts by mass of ⁇ -butyrolactone. Is preferred.
- jER828 manufactured by Mitsubishi Chemical Corporation is preferably used as the liquid bisphenol A type epoxy resin, and the temperature rise rate in the DSC measurement is preferably 10 ° C./min.
- the curing agent of the present invention preferably contains a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C or lower.
- the thermal cation polymerization initiator has a narrower temperature range at which heat is generated near the reaction activation temperature than the imidazole compound. Therefore, while obtaining sufficient curability of the film adhesive at a low temperature, the reaction with the compound having a cyclic ether group hardly proceeds at a temperature lower than the temperature at which the film adhesive is cured, and has excellent storage stability. There is an advantage that a film-like adhesive is easily obtained.
- the reaction activation temperature is at least one content selected from an imidazole compound having a temperature of 125 ° C. or less and a thermal cation polymerization initiator having a reaction activation temperature of 160 ° C. or less, based on 100 parts by mass of the compound having a cyclic ether group.
- the amount is more preferably from 0.05 to 10 parts by mass, even more preferably from 0.1 to 8 parts by mass.
- the curable film adhesive of the present invention comprises a compound having a cyclic ether group, a polymer component, an imidazole compound having a reaction activation temperature of 125 ° C. or lower, and a thermal cationic polymerization in which the reaction activation temperature is 160 ° C. or lower.
- Other components may be contained in addition to the curing agent containing at least one selected from agents.
- Other components include a silane coupling agent, a tackifier and the like.
- silane coupling agent examples include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, and 3-acryloxypropyltrisilane.
- the content is preferably 0.01 to 10 parts by mass, more preferably 100 parts by mass, based on 100 parts by mass of the compound having a cyclic ether group. Is from 0.02 to 5 parts by mass.
- a high-temperature environment is an environment at 40 to 80 ° C.
- tackifier examples include rosin resins such as rosin resin, rosin ester resin and rosin modified phenol resin; hydrogenated rosin resin obtained by hydrogenating these rosin resins; terpene resin, aromatic modified terpene resin, terpene phenol Terpene resins such as terpene resins; hydrogenated terpene resins obtained by hydrogenating these terpene resins; ⁇ -methylstyrene homopolymer resin, ⁇ -methylstyrene / styrene copolymer resin, styrene monomer / aliphatic resin Styrene resin such as monomer copolymer resin, styrene monomer / ⁇ -methylstyrene / aliphatic monomer copolymer resin, styrene monomer homopolymer resin, styrene monomer / aromatic monomer copolymer resin Hydrogenated styrenic resins obtained by hydrogenating these
- a styrene resin is preferable, and a styrene monomer / aliphatic monomer copolymer resin is more preferable.
- These tackifiers can be used alone or in combination of two or more.
- the content of the tackifier is preferably 1 to 200 parts by mass, more preferably 1 to 200 parts by mass, based on 100 parts by mass of the compound having a cyclic ether group. Is from 10 to 150 parts by mass.
- the content of the tackifier is in the above range, a curable film-like adhesive having more excellent film-forming properties under a normal temperature environment can be easily obtained.
- the curable film adhesive of the present invention may contain other components other than the silane coupling agent and the tackifier as long as the effects of the present invention are not impaired.
- the other components include an antistatic agent, a stabilizer, an antioxidant, a plasticizer, a lubricant, and a coloring pigment. These contents may be appropriately determined according to the purpose.
- the curable film adhesive of the present invention is obtained by forming a film of an adhesive composition obtained by mixing the above components at an appropriate ratio.
- each component may be diluted with a solvent in advance, or a solvent may be added at the time of mixing. Further, when the adhesive composition is used, it may be diluted with a solvent.
- the above-mentioned mixing and kneading can be performed by using an ordinary stirrer, a mill, a three-roller, a disperser such as a ball mill, or the like, and combining these as appropriate.
- the organic solvent for preparing the adhesive composition is not particularly limited as long as it can uniformly dissolve, knead or disperse the above components, and conventionally known organic solvents can be used.
- solvents include aliphatic hydrocarbon solvents such as n-hexane and n-heptane; aromatic hydrocarbon solvents such as toluene and xylene; dichloromethane, ethylene chloride, chloroform, carbon tetrachloride, 1,2-dichloroethane, Halogenated hydrocarbon solvents such as monochlorobenzene; alcohol solvents such as methanol, ethanol, propanol, butanol, propylene glycol monomethyl ether; ketone solvents such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, cyclohexanone; ethyl acetate, acetic acid Ester solvents such as butyl; cellosolve solvents such as eth
- a layer of the adhesive composition is formed by applying the obtained adhesive composition on a release film. Next, the solvent is removed from the layer of the adhesive composition by heating and drying, whereby a film-like adhesive with a release film can be obtained.
- these laminated films may be used. Further, a film in which these are colored can be used. Moreover, it is preferable that the surface of the release film on the side where the adhesive composition layer is laminated is subjected to a release treatment from the viewpoint of workability.
- the method of applying the adhesive composition on the release film is not particularly limited, and a conventionally known application method can be employed. For example, spin coating, spray coating, bar coating, knife coating, roll coating, blade coating, die coating, gravure coating and the like can be mentioned.
- the method for drying the coating film is not particularly limited, and a known method for drying a coating film of the resin composition can be used.
- the heating / drying temperature is not particularly limited as long as the solvent used is sufficiently volatilized and the curable film-like adhesive layer is not cured, but is usually 80 to 100 ° C., and the heating time is usually , Tens of seconds to tens of minutes.
- a protective film is further laminated on the curable film adhesive layer of the curable film adhesive with a release film, and stored as a protective film and a film adhesive with a release film. You may carry it.
- the protective film the same film as the release film can be used.
- the surface of the protective film on the side to be laminated with the layer of the curable film adhesive may be subjected to a release treatment. Note that the release film and the protective film are peeled and removed when the curable film adhesive is used.
- the curable film adhesive of the present invention may be obtained by molding the above-mentioned adhesive composition (containing no solvent) into a film (a so-called hot melt adhesive may be used). ).
- the film-like adhesive may be obtained by laminating release films on both surfaces.
- the curable film adhesive of the present invention formed during the manufacturing process may be hereinafter referred to as “adhesive layer”.
- the thickness of the curable film adhesive of the present invention is not particularly limited, but is preferably 3 to 300 ⁇ m, more preferably 5 to 250 ⁇ m, and particularly preferably 7 to 200 ⁇ m.
- the curable film adhesive of the present invention is used for a member constituting a sensor device.
- “used for a member constituting the sensor device” means “the curable film-shaped adhesive of the present invention is used for the members constituting the sensor device, or the members constituting the sensor device and other members. It is used as an adhesive for bonding. "
- Sensor device is a general term for a device that senses an absolute value or a change of a physical quantity such as intensity of light wave or radiation, temperature, pressure, flow velocity, pH and the like.
- optical sensor devices such as optoelectronics, infrared sensors, visible light sensors, ultraviolet (UV) sensors, illuminance sensors, radiation detection sensors, color sensors, etc .
- analog temperature sensors, digital temperature sensors, temperature sensor devices such as thermocouples; magnetic sensors, Encoders, accessories, position sensors, proximity sensors, acceleration sensors, level sensors, image sensors, motion sensors, humidity sensors, gas sensors, flow sensors, gyroscopes, vibration sensors, shock sensors, leak sensors, piezo sensors, alcohol sensors,
- Other sensor devices such as a speed rotation sensor.
- the curable film adhesive of the present invention can be cured at a low temperature, and can provide a cured product having excellent transparency, so when the sensor device is an optical sensor device, Particularly preferred.
- the total light transmittance of the curable film adhesive after curing is 80% or more. And more preferably 90% or more.
- the sensor device is an optical sensor device, if the total light transmittance after curing of the film adhesive is high, even if the film adhesive is located between the light receiving element and the light-entering part, light is captured. Is not hindered by the film adhesive, which is preferable.
- the curable film adhesive of the present invention When the members constituting the sensor device are adhered to each other using the curable film adhesive of the present invention, for example, a book cut into an appropriate size is attached to the adhesive surface of the member constituting one sensor device.
- the film adhesive of the present invention is attached, and the adhesive surface of the member constituting the other sensor device is superimposed thereon, and the adhesive is heated to a predetermined temperature to cure the adhesive, thereby forming the sensor device. Can be adhered to each other.
- the film-like adhesive of the present invention cut into an appropriate size is attached to the adhesion surface of the member constituting the sensor device (or another member).
- the heating temperature when the curable film adhesive is heated to a predetermined temperature is preferably 80 to 125 ° C, more preferably 80 to 110 ° C.
- the curable film adhesive of the present invention contains a curing agent containing at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C. or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower. Therefore, the curing reaction can sufficiently proceed by low-temperature heating. Therefore, members constituting various devices that are easily affected by heat can be bonded without adversely affecting heat.
- the method for producing a device of the present invention comprises a cyclic ether compound, a polymer component, an imidazole compound having a reaction activation temperature of 125 ° C. or lower, and thermal cationic polymerization starting with a reaction activation temperature of 160 ° C. or lower.
- a curable film-like adhesive containing a curing agent containing the agent hereinafter, this may be referred to as a “film-like adhesive (A)” is attached to a member including a module, and is heated to 80 to 110 ° C.
- the method includes a step of curing the curable film adhesive by heating to a temperature in the range.
- the cyclic ether compound, the polymer component, and the curing agent including the imidazole compound having a reaction activation temperature of 125 ° C. or lower and the thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower are the compounds having a cyclic ether group.
- Curable film adhesives "can be used.
- a film-shaped adhesive (A) cut into an appropriate size is attached to the bonding surface of the member including one module. And bonding the members including the module to each other by heating the film adhesive (A) to a predetermined temperature and curing the film-like adhesive (A). .
- a film-shaped adhesive (A) cut into an appropriate size is bonded to the bonding surface of the member including the module (or another member), Thereupon, a step of superposing the bonding surface of another member (or a member including a module) thereon, heating the film adhesive (A) to a predetermined temperature, curing the film adhesive, and bonding the members constituting the sensor device to each other.
- the heating temperature for heating and curing the film adhesive (A) to a predetermined temperature is from 80 to 110 ° C. from the viewpoint of reducing adverse effects of heat on the module.
- the film adhesive (A) contains a curing agent containing at least one selected from an imidazole compound having a reaction activation temperature of 125 ° C. or lower and a thermal cationic polymerization initiator having a reaction activation temperature of 160 ° C. or lower.
- the reaction activation temperature was obtained by mixing 100 parts by mass of the liquid bisphenol A epoxy resin and 5 parts by mass of the imidazole compound for the imidazole compound and performing DSC measurement.
- the thermal cationic polymerization initiator 100 parts by mass of a liquid bisphenol A type epoxy resin (manufactured by Mitsubishi Chemical Corporation, jER828), 0.1 part by mass of a thermal cationic polymerization initiator, and 0.1 part by mass of ⁇ -butyrolactone are mixed. , At a heating rate of 10 ° C./min.
- Example 1 100 parts of acid-modified polyolefin resin (acid-modified ⁇ -olefin polymer, manufactured by Mitsui Chemicals, Inc., trade name: Unistor H-200, weight average molecular weight: 52,000), polyfunctional epoxy compound (1) (hydrogenated bisphenol A type epoxy resin, manufactured by Mitsubishi Chemical Corporation, trade name: YX8000, epoxy equivalent: 205 g / eq), 25 parts, curing agent (manufactured by Shikoku Chemicals, trade name: Curesol 2E4MZ, 2-ethyl-4-methylimidazole, reaction activity) (Chemicalization temperature: 107 ° C.) 0.25 parts and a silane coupling agent (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM6803) 0.1 part are dissolved in methyl ethyl ketone, and the adhesive composition 1 has a solid concentration of 20%.
- acid-modified polyolefin resin ascid-modified
- This adhesive composition 1 was applied onto a release-treated surface of a release film (trade name: SP-PET382150, manufactured by Lintec Corporation), and the obtained coating film was dried at 100 ° C. for 2 minutes to obtain a film having a thickness of 10 ⁇ m. After forming an adhesive layer, a release-treated surface of another release film (trade name: SP-PET381031 manufactured by Lintec Co., Ltd.) is bonded thereon, and a curable film-like adhesive 1 with a release film is attached. Obtained.
- Example 2 100 parts of acid-modified polyolefin resin (acid-modified ⁇ -olefin polymer, manufactured by Mitsui Chemicals, Inc., trade name: Unistor H-200, weight average molecular weight: 52,000), polyfunctional epoxy compound (1) (bisphenol A Glycidyl ether, manufactured by Mitsubishi Chemical Corporation, trade name: YL980, epoxy equivalent: 180 to 190 g / eq, molecular weight: 2,400) 100 parts, tackifier (styrene monomer aliphatic monomer copolymer, softening point 95 ° C., 50 parts of Mitsui Chemicals, trade name: FTR6100) and 1 part of a curing agent (trade name: Curesol 2E4MZ, 2-ethyl-4-methylimidazole, reaction activation temperature: 107 ° C., manufactured by Shikoku Chemicals Co., Ltd.) To prepare an adhesive composition 2 having a solid content of 30%.
- This adhesive composition 2 was applied on a release-treated surface of a release film (trade name: SP-PET382150, manufactured by Lintec Corporation), and the obtained coating film was dried at 100 ° C. for 2 minutes to form a 12 ⁇ m thick adhesive film. An adhesive layer is formed, and a release-treated surface of another release film (trade name: SP-PET381031 manufactured by Lintec Corporation) is bonded thereon to obtain a curable film adhesive 2 with a release film.
- a release-treated surface of a release film (trade name: SP-PET382150, manufactured by Lintec Corporation)
- Example 3 As a binder component, 100 parts of a phenoxy resin (trade name: YX7200B35, manufactured by Mitsubishi Chemical Corporation, weight average molecular weight: 30,000), a compound having a cyclic ether group (hydrogenated bisphenol A type epoxy resin, manufactured by Mitsubishi Chemical Corporation, trade name) : YX8034) 250 parts, thermal cationic polymerization initiator (manufactured by Sanshin Chemical Industry Co., Ltd., trade name: SAN-AID SI-B3, reaction activation temperature: 140 ° C), 2 parts, silane coupling agent (Shin-Etsu Chemical) 0.2 parts (manufactured by Kogyo Co., Ltd., trade name: KBM4803) was dissolved in methyl ethyl ketone to prepare a coating solution having a solid content of 35%.
- a phenoxy resin trade name: YX7200B35, manufactured by Mitsubishi Chemical Corporation, weight average molecular weight: 30,000
- This coating solution is applied on a release-treated surface of a release film (trade name: SP-PET382150, manufactured by Lintec Corporation), and the obtained coating film is dried at 100 ° C. for 2 minutes to form an adhesive layer having a thickness of 10 ⁇ m. Was formed thereon, and a release-treated surface of another release film (trade name: SP-PET381031 manufactured by Lintec Corporation) was bonded thereon to obtain a curable film adhesive 3 having a release film.
- a release-treated surface of a release film (trade name: SP-PET382150, manufactured by Lintec Corporation)
- Example 1 Example 1 was repeated except that the imidazole-based curing catalyst was changed to 1- (2-cyanoethyl) -2-undecylimidazole (manufactured by Shikoku Chemicals, trade name: C11Z-CN, reaction activation temperature: 146 ° C.). Similarly, adhesive composition 4 was prepared, and curable film adhesive 4 with a release film was obtained.
- Acrylic resin Acrylic resin (weight average molecular weight (Mw) 600,000) obtained by copolymerizing methyl acrylate (85 parts by mass) and 2-hydroxyethyl acrylate (15 parts by mass): 100 parts by mass
- epoxy resin trade name “CNA-147” manufactured by Nippon Kayaku Co., Ltd.
- phenol resin trade name “Mirex XLC-4L” manufactured by Mitsui Chemicals, Inc.
- spherical silica Average particle size 0.05 ⁇ m, trade name “YA050C-SV2” manufactured by Admatechs Co., Ltd.
- cross-linking agent trade name “BHS8515” manufactured by Toyochem Corporation
- a polyethylene terephthalate film (thickness: 38 ⁇ m) was coated with the obtained adhesive composition on the release-treated surface of a release film obtained by subjecting one side of the release film to a silicone treatment, and dried at 100 ° C. for 2 minutes. A 10 ⁇ m film adhesive 5 was obtained.
- Table 1 shows that the film adhesives of Examples 1 to 3 have a high gel fraction, a sufficiently advanced curing reaction even at a low temperature (100 ° C.), and have excellent transparency. It can be seen that a cured product is obtained. On the other hand, the film adhesives of Comparative Examples 1 and 2 give a cured product having excellent transparency, but have a low gel fraction, suggesting that the curing reaction has not proceeded sufficiently.
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Abstract
Description
例えば、特許文献1には、(i)複数の画素が形成されたセンサー領域を有する表面を備えたセンサーチップを、フェイスアップで配線基板の上面に搭載してから、センサーチップの表面における複数箇所に第1接着材を配置し、この第1接着材を硬化することにより、粘着性を有する第1スペーサを、センサーチップの表面に複数形成する工程、(ii)センサーチップの表面にペースト状の第2接着材を配置してから、複数の光学領域が形成された遮光層を有する第1光学部品を、第1光学部品に荷重を加えながら、複数の第1スペーサ及び第2接着材を介してセンサーチップの表面上に配置する工程、及び,(iii)その後、第1光学部品に荷重を加えない状態で第2接着材を硬化させることにより、第1光学部品を固定する工程を有する半導体装置の製造方法が記載されている。
また、この文献には、センサーチップ上に紫外線硬化型の接着剤を塗布し、その上に光学部品を配置し、ボンディングツールで光学部品を保持した状態で接着剤に紫外線を照射して接着剤を硬化させて、センサーチップ上に光学部品を接着させる方法も記載されている。
さらに、この文献には、用いる接着材は透光性を有することが必要であることも記載されている。
しかしながら、低温での熱処理には、接着剤を十分に硬化させにくいという問題があった。
〔2〕前記反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種の反応活性化温度が100℃以上である、〔1〕に記載の硬化性フィルム状接着剤。
〔3〕前記センサーデバイスが光学センサーデバイスであり、前記硬化性フィルム状接着剤の硬化後の全光線透過率が80%以上である、〔1〕又は〔2〕のいずれかに記載の硬化性フィルム状接着剤。
〔4〕前記硬化剤が、反応活性化温度が125℃以下であるイミダゾール系化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を主成分とするものである、〔1〕~〔3〕のいずれかに記載の硬化性フィルム状接着剤。
〔5〕前記硬化剤が、反応活性化温度が160℃以下である熱カチオン重合開始剤を含むものである、〔1〕~〔4〕のいずれかに記載の硬化性フィルム状接着剤。
〔6〕前記重合体成分が、酸変性ポリオレフィン系樹脂を含むものである、〔1〕~〔5〕のいずれかに記載の硬化性フィルム状接着剤。
〔7〕前記環状エーテル化合物が脂肪族化合物である、〔1〕~〔6〕のいずれかに記載の硬化性フィルム状接着剤。
〔8〕環状エーテル化合物、重合体成分、並びに反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含有する硬化性フィルム状接着剤を、モジュールを含む部材に貼り付け、80~110℃の範囲の温度に加熱することにより、硬化性フィルム状接着剤を硬化させる工程を含む、デバイスの製造方法。
本発明は、環状エーテル基を有する化合物、重合体成分、並びに反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含有し、センサーデバイスを構成する部材に用いられる、硬化性フィルム状接着剤である。
「フィルム状」とは、本発明の接着剤がフィルム形状又はシート形状を有する意である。本発明のフィルム状接着剤は、短冊状(ラベル形状)のものであっても、長尺状(ロール状に巻き取ることができる形状)のものであってもよい。
本発明の硬化性フィルム状接着剤は、環状エーテル基を有する化合物を含有する。
環状エーテル基を有する化合物は、後述する重合体成分との相溶性に優れるため、このものを使用することで、常温環境下における造膜性及びシート加工性に優れるフィルム状接着剤を得ることができる。
なお、本明細書において、常温環境下とは、20℃±15℃(5~35℃)の環境下である(JIS Z 8703)。
環状エーテル基としては、オキシラン基(エポキシ基)、オキセタン基(オキセタニル基)、テトラヒドロフリル基、テトラヒドロピラニル基等が挙げられる。
これらの中でも、常温環境下における造膜性及びシート加工性により優れたフィルム状接着剤、並びに接着強度により優れたフィルム状接着剤の硬化物を得ることができるという観点から、オキシラン基又はオキセタン基を有する化合物であることが好ましく、分子内に2個以上のオキシラン基又はオキセタン基を有する化合物が特に好ましい。
なお、本発明においては、後述するフェノキシ樹脂は含めないものとする。
脂肪族多価アルコール、又はそのアルキレンオキサイド付加物のポリグリシジルエーテル化物、脂肪族長鎖多塩基酸のポリグリシジルエステル、トリアジン骨格を有するエポキシ化合物等の多官能エポキシ化合物が挙げられる。
脂肪族高級アルコールのモノグリシジルエーテルや高級脂肪酸のグリシジルエステル、エポキシ化大豆油、エポキシステアリン酸オクチル、エポキシステアリン酸ブチル、エポキシ化ポリブタジエン;
2,4,6-トリ(グリシジルオキシ)-1,3,5-トリアジン等が挙げられる。
エポライトM-1230、エポライト40E、エポライト100E、エポライト200E、エポライト400E、エポライト70P、エポライト200P、エポライト400P、エポライト1500NP、エポライト1600、エポライト80MF、エポライト100MF(以上、共栄社化学社製);
アデカグリシロールED-503、アデカグリシロールED-503G、アデカグリシロールED-506、アデカグリシロールED-523T、アデカレジンEP-4088S、アデカレジンEP-4088L、アデカレジンEP-4080E(以上、ADEKA社製);
TEPIC-FL、TEPIC-PAS、TEPIC-UC(以上、日産化学社製)等が挙げられる。
これらの脂環式エポキシ化合物の代表的な化合物としては、水素添加ビスフェノールAジグリシジルエーテル、3,4-エポキシシクロヘキシルメチル-3,4-エポキシシクロヘキサンカルボキシレート、3,4-エポキシ-1-メチルシクロヘキシル-3,4-エポキシ-1-メチルヘキサンカルボキシレート、6-メチル-3,4-エポキシシクロヘキシルメチル-6-メチル-3,4-エポキシシクロヘキサンカルボキシレート、3,4-エポキシ-3-メチルシクロヘキシルメチル-3,4-エポキシ-3-メチルシクロヘキサンカルボキシレート、3,4-エポキシ-5-メチルシクロヘキシルメチル-3,4-エポキシ-5-メチルシクロヘキサンカルボキシレート、ビス(3,4-エポキシシクロヘキシルメチル)アジペート、3,4-エポキシ-6-メチルシクロヘキサンカルボキシレート、メチレンビス(3,4-エポキシシクロヘキサン)、プロパン-2,2-ジイル-ビス(3,4-エポキシシクロヘキサン)、2,2-ビス(3,4-エポキシシクロヘキシル)プロパン、ジシクロペンタジエンジエポキサイド、エチレンビス(3,4-エポキシシクロヘキサンカルボキシレート)、エポキシヘキサヒドロフタル酸ジオクチル、エポキシヘキサヒドロフタル酸ジ-2-エチルヘキシル、1-エポキシエチル-3,4-エポキシシクロヘキサン、1,2-エポキシ-2-エポキシエチルシクロヘキサン、α-ピネンオキシド、リモネンジオキシド等が挙げられる。
これらの芳香族エポキシ化合物の代表的な化合物としては、ビスフェノールA、ビスフェノールF、又はこれらにさらにアルキレンオキサイドを付加した化合物のグリシジルエーテル化物やエポキシノボラック樹脂;
レゾルシノールやハイドロキノン、カテコール等の2個以上のフェノール性水酸基を有する芳香族化合物のモノ/ポリグリシジルエーテル化物;
フェニルジメタノールやフェニルジエタノール、フェニルジブタノール等のアルコール性水酸基を2個以上有する芳香族化合物のグリシジルエーテル化物;
フタル酸、テレフタル酸、トリメリット酸等の2個以上のカルボン酸を有する多塩基酸芳香族化合物のグリシジルエステル、安息香酸のグリシジルエステル、スチレンオキサイド又はジビニルベンゼンのエポキシ化物等が挙げられる。
環状エーテル基を有する化合物の環状エーテル当量は、好ましくは100g/eq以上500g/eq以下、より好ましくは150g/eq以上300g/eq以下である。
環状エーテル当量が上記範囲にある環状エーテル基を有する化合物を用いることで、接着強度が強く硬化性に優れる硬化性フィルム状接着剤を効率よく作製することができる。
これらの環状エーテル基を有する化合物は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
なお、本発明における環状エーテル当量とは、分子量を環状エーテル基数で除した値を意味する。
本発明の硬化性フィルム状接着剤は、前記環状エーテル基を有する化合物に加えて、重合体成分を含有する。
重合体成分を含有することで、シート加工性により優れたフィルム状接着剤、及び接着強度により優れたフィルム状接着剤の硬化物を得ることができる。また、重合体成分を含有することで、所望の厚みのフィルム状接着剤を効率よく製造することができる。
上記の目的を達成するため、重合体成分の重量平均分子量(Mw)は、通常20,000以上であり、20,000~3,000,000であることが好ましい。また、重合体成分の数平均分子量(Mn)は、好ましくは10,000~2,000,000、より好ましくは、20,000~1,500,000である。
重合体成分の重量平均分子量(Mw)及び数平均分子量(Mn)は、テトラヒドロフラン(THF)を溶媒として用いてゲルパーミエーションクロマトグラフィー(GPC)を行い、標準ポリスチレン換算値として求めることができる。
これらの中でも、環状エーテル基を有する化合物との相溶性の観点から、ポリオレフィン系樹脂、変性ポリオレフィン系樹脂、アクリル系重合体、ポリエステル樹脂、フェノキシ樹脂が好ましい。
ポリオレフィン系樹脂は、オレフィン系単量体由来の繰り返し単位を含む重合体である。ポリオレフィン樹脂は、オレフィン系単量体由来の繰り返し単位のみからなる重合体であってもよいし、オレフィン系単量体由来の繰り返し単位と、オレフィン系単量体と共重合可能な単量体由来の繰り返し単位とからなる重合体であってもよい。
これらのオレフィン系単量体は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
これらのオレフィン系単量体と共重合可能な単量体は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
変性ポリオレフィン系樹脂は、ポリオレフィン系樹脂を前駆体として用い、これに変性剤を用いて変性処理を施して得られる、官能基が導入されたポリオレフィン系樹脂である。
ポリオレフィン系樹脂の変性処理に用いる変性剤は、分子内に、官能基を有する化合物である。
変性ポリオレフィン系樹脂は、環状エーテル化合物の熱反応を促進し、フィルム状接着剤の低温における硬化性が向上するため重合体成分として好適に用いられる。
官能基としては、カルボキシル基、カルボン酸無水物基、カルボン酸エステル基、水酸基、エポキシ基、アミド基、アンモニウム基、ニトリル基、アミノ基、イミド基、イソシアネート基、アセチル基、チオール基、エーテル基、チオエーテル基、スルホン基、ホスホン基、ニトロ基、ウレタン基、アルコキシシリル基、シラノール基、ハロゲン原子等が挙げられる。これらの中でも、カルボキシル基、カルボン酸無水物基、カルボン酸エステル基、水酸基、アンモニウム基、アミノ基、イミド基、イソシアネート基、アルコキシシリル基が好ましく、カルボキシル基、カルボン酸無水物基、アルコキシシリル基がより好ましく、フィルム状接着剤の低温における硬化性を向上させる観点からは、カルボキシル基、カルボン酸無水物基が特に好ましい。
官能基を有する化合物は、分子内に2種以上の官能基を有していてもよい。
これらは、1種を単独で、あるいは2種以上を組み合わせて用いることができる。これらの中でも、シート加工性により優れたフィルム状接着剤、及び接着強度により優れたフィルム状接着剤の硬化物が得られ易いことから、無水マレイン酸が好ましい。
これらは、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
なお、不飽和シラン化合物を主鎖であるポリオレフィン樹脂にグラフト重合させる場合の条件は、公知のグラフト重合の常法を採用すればよい。
アクリル系重合体は、分子内に、(メタ)アクリル酸エステル由来の繰り返し単を含む重合体である。アクリル系重合体における(メタ)アクリル酸エステル由来の繰り返し単位の割合は、全繰り返し単位に対して、通常40質量%以上、好ましくは50質量%以上、より好ましくは60質量%以上、特に好ましくは70質量%以上である。なお、アクリル系重合体に含まれる繰り返し単位の割合は、通常、アクリル系重合体の重合に用いる全単量体における、各繰り返し単位を形成し得る単量体の比率(仕込み比)に一致する。
ここで、(メタ)アクリルは、アクリル及びメタアクリルの両者を包含する意味である。
ポリエステル樹脂は、多価カルボン酸(ジカルボン酸)とポリアルコール(ジオール)との重縮合体である。
ポリエステル樹脂としては、ポリエチレンテレフタレート、ポリエチレンイソフタレート、ポリエチレンナフタレート、ポリトリメチレンテレフタレート、ポリトリメチレンナフタレート、ポリブチレンテレフタレート、ポリブチレンナフタレート、ポリ乳酸等が挙げられる。
フェノキシ樹脂は、ビスフェノールAとエピクロロヒドリンの高分子量熱可塑性縮合生成物及びそれらの誘導体である。
フェノキシ樹脂としては、特に限定されるものではなく、ビスフェノールA骨格、ビスフェノールF骨格、ビスフェノールS骨格、ビスフェノールアセトフェノン骨格、ノボラック骨格、ビフェニル骨格、フルオレン骨格、ジシクロペンタジエン骨格、ノルボルネン骨格、ナフタレン骨格、アントラセン骨格、アダマンタン骨格、テルペン骨格、トリメチルシクロキサン骨格から選択される1種以上の骨格を有するものが挙げられる。
本発明の硬化性フィルム状接着剤は、前記環状エーテル基を有する化合物及び重合体成分に加えて、反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含有する。
硬化剤は、フィルム状接着剤の熱硬化の反応温度及び反応速度を調整する目的で用いられる。
2-(3,4-エポキシシクロヘキシル)エチルトリメトキシシラン、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン、3-グリシドキシプロピルトリエトキシシラン、8-グリシドキシオクチルトリメトキシシラン等のエポキシ基を有するシランカップリング剤;p-スチリルトリメトキシシラン、p-スチリルトリエトキシシラン等のスチリル基を有するシランカップリング剤;N-(2-アミノエチル)-3-アミノプロピルメチルジメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルトリメトキシシラン、N-(2-アミノエチル)-3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシラン、3-アミノプロピルトリエトキシシラン、3-トリエトキシシリル-N-(1,3-ジメチル・ブチリデン)プロピルアミン、N-フェニル-3-アミノプロピルトリメトキシシラン、N-2-(アミノエチル)-8-アミノオクチルトリメトキシシラン、N-(ビニルベンジル)-2-アミノエチル-3-アミノプロピルトリメトキシシランの塩酸塩等のアミノ基を有するシランカップリング剤;
3-ウレイドプロピルトリメトキシシラン、3-ウレイドプロピルトリエトキシシラン等のウレイド基を有するシランカップリング剤;3-クロロプロピルトリメトキシシラン、3-クロロプロピルトリエトキシシラン等のハロゲン原子を有するシランカップリング剤;3-メルカプトプロピルメチルジメトキシシラン、3-メルカプトプロピルトリメトキシシラン等のメルカプト基を有するシランカップリング剤;ビス(トリメトキシシリルプロピル)テトラスルフィド、ビス(トリエトキシシリルプロピル)テトラスルフィド等のスルフィド基を有するシランカップリング剤;3-イソシアネートプロピルトリメトキシシラン、3-イソシアネートプロピルトリエトキシシラン等のイソシアネート基を有するシランカップリング剤;アリルトリクロロシラン、アリルトリエトキシシラン、アリルトリメトキシシラン等のアリル基を有するシランカップリング剤;3-ヒドキシプロピルトリメトキシシラン、3-ヒドキシプロピルトリエトキシシラン等の水酸基を有するシランカップリング剤;等が挙げられる。
これらのシランカップリング剤は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
シランカップリング剤の含有量を上記範囲とすることで、常温及び高温環境下における接着強度により優れるフィルム状接着剤の硬化物が得られやすくなる。
なお、本明細書において、高温環境下とは、40~80℃の環境下である。
これらの中でも、スチレン系樹脂が好ましく、スチレン系モノマー/脂肪族系モノマー共重合系樹脂がより好ましい。
これらの粘着付与剤は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
粘着付与剤の含有量を上記範囲とすることで、常温環境下における造膜性により優れる、硬化性フィルム状接着剤が得られ易くなる。
前記他の成分としては、帯電防止剤、安定剤、酸化防止剤、可塑剤、滑剤、着色顔料等が挙げられる。これらの含有量は、目的に合わせて適宜決定すればよい。
本発明の硬化性フィルム状接着剤は、上記の各成分を適宜の割合で混合して得られる接着剤組成物を製膜して得られる。
上記の混合、混練は、通常の攪拌機、らいかい機、三本ロール、ボールミル等の分散機を用い、これらを適宜組み合わせて行うことができる。
かかる溶媒としては、n-ヘキサン、n-ヘプタン等の脂肪族炭化水素系溶媒;トルエン、キシレン等の芳香族炭化水素系溶媒;ジクロロメタン、塩化エチレン、クロロホルム、四塩化炭素、1,2-ジクロロエタン、モノクロロベンゼン等のハロゲン化炭化水素系溶媒;メタノール、エタノール、プロパノール、ブタノール、プロピレングリコールモノメチルエーテル等のアルコール系溶媒;アセトン、メチルエチルケトン、2-ペンタノン、イソホロン、シクロヘキサノン等のケトン系溶媒;酢酸エチル、酢酸ブチル等のエステル系溶媒;エチルセロソルブ等のセロソルブ系溶媒;1,3-ジオキソラン等のエーテル系溶媒;等が挙げられる。
これらの溶媒は、1種単独で、あるいは2種以上を組み合わせて用いることができる。溶媒の含有量は、塗工性や膜厚等を考慮して適宜決定することができる。
また、剥離フィルムの接着剤組成物の層が積層される側の表面には、作業性の観点から、剥離処理が施されていることが好ましい。
加熱・乾燥温度は、使用した溶媒が十分に揮散し、硬化性フィルム状接着剤の層が硬化しない条件であれば特に制限はないが、通常、80~100℃であり、加熱時間は、通常、数十秒から数十分である。
保護フィルムとしては、前記剥離フィルムと同様のものを用いることができる。また、保護フィルムの硬化性フィルム状接着剤の層と積層する側の面には剥離処理が施されていてもよい。
なお、剥離フィルム及び保護フィルムは、硬化性フィルム状接着剤の使用時においては、剥離除去されるものである。
ここで、「センサーデバイスを構成する部材に用いられる」とは、「本願発明の硬化性フィルム状接着剤が、センサーデバイスを構成する部材同士、あるいは、センサーデバイスを構成する部材と他の部材とを接着する接着剤として用いられる」という意味である。
センサーデバイスが光学センサーデバイスである場合には、フィルム状接着剤の硬化後の全光線透過率が高いと、受光素子と入光部の間にフィルム状接着剤が位置しても、光の取り込みがフィルム状接着剤により阻害されることがないため、好ましい。
また、センサーデバイスを構成する部材と他の部材とを接着する場合は、センサーデバイスを構成する部材(あるいは他の部材)の接着面に、適当な大きさに裁断した本発明のフィルム状接着剤を貼り合せ、そこへ、他の部材(あるいはセンサーデバイスを構成する部材)の接着面を重ね合わせ、接着剤を所定温度に加熱して、接着剤を硬化させて、センサーデバイスを構成する部材と他の部材とを接着させることができる。
本発明の硬化性フィルム状接着剤は、反応活性化温度が125℃以下あるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含むものであるため、低温加熱で十分に硬化反応を進行させることができる。よって、熱による影響を受けやすい各種デバイスを構成する部材を熱による悪影響を与えることなく接着させることができる。
本発明のデバイスの製造方法は、環状エーテル化合物、重合体成分、並びに反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下の熱カチオン重合開始剤を含む硬化剤を含有する硬化性フィルム状接着剤(以下、このものを「フィルム状接着剤(A)」ということがある。)を、モジュールを含む部材に貼り付け、80~110℃の範囲の温度に加熱することにより、硬化性フィルム状接着剤を硬化させる工程を含むものである。
また、モジュールを含む部材と他の部材とを接着する場合は、モジュールを含む部材(あるいは他の部材)の接着面に、適当な大きさに裁断したフィルム状接着剤(A)を貼り合せ、そこへ、他の部材(あるいはモジュールを含む部材)の接着面を重ね合わせ、フィルム状接着剤(A)を所定温度に加熱し、硬化させて、センサーデバイスを構成する部材同士を接着させる工程を含むものである。
フィルム状接着剤(A)は、反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含むものであるため、低温加熱で十分に硬化反応を進行させることで、モジュールを含む部材を接着させることができる。
各例中の部及び%は、特に断りのない限り、質量基準である。反応活性化温度は、イミダゾール化合物については、液状ビスフェノールA型エポキシ樹脂100質量部、イミダゾール化合物5質量部を混合し、DSC測定をして得たものである。また、熱カチオン重合開始剤については、液状ビスフェノールA型エポキシ樹脂(三菱ケミカル社製、jER828)100質量部、熱カチオン重合開始剤0.1質量部、γ-ブチロラクトン0.1質量部を混合し、昇温速度10℃/分でDSC測定をして得たものである。
酸変性ポリオレフィン系樹脂(酸変性α-オレフィン重合体、三井化学社製、商品名:ユニストールH-200、重量平均分子量:52,000)100部、多官能エポキシ化合物(1)(水添ビスフェノールA型エポキシ樹脂、三菱ケミカル社製、商品名:YX8000、エポキシ当量:205g/eq)25部、硬化剤(四国化成社製、商品名:キュアゾール2E4MZ、2-エチル-4-メチルイミダゾール、反応活性化温度:107℃)0.25部、及び、シランカップリング剤(信越化学工業社製、商品名:KBM6803)0.1部をメチルエチルケトンに溶解し、固形分濃度20%の接着剤組成物1を調製した。
この接着剤組成物1を、剥離フィルム(リンテック社製、商品名:SP-PET382150)の剥離処理面上に塗工し、得られた塗膜を100℃で2分間乾燥し、厚みが10μmの接着剤層を形成し、その上に、もう1枚の剥離フィルム(リンテック社製、商品名:SP-PET381031)の剥離処理面を貼り合わせて、剥離フィルム付きの硬化性フィルム状接着剤1を得た。
酸変性ポリオレフィン系樹脂(酸変性α-オレフィン重合体、三井化学社製、商品名:ユニストールH-200、重量平均分子量:52,000)100部、多官能エポキシ化合物(1)(ビスフェノールAジグリシジルエーテル、三菱ケミカル社製、商品名:YL980、エポキシ当量180~190g/eq、分子量:2,400)100部、粘着付与剤(スチレン系モノマー脂肪族系モノマー共重合体、軟化点95℃、三井化学社製、商品名:FTR6100)50部、及び、硬化剤(四国化成社製、商品名:キュアゾール2E4MZ、2-エチル-4-メチルイミダゾール、反応活性化温度:107℃)1部をメチルエチルケトンに溶解し、固形分濃度30%の接着剤組成物2を調製した。この接着剤組成物2を剥離フィルム(リンテック社製、商品名:SP-PET382150)の剥離処理面上に塗工し、得られた塗膜を100℃で2分間乾燥し、厚みが12μmの接着剤層を形成し、その上に、もう1枚の剥離フィルム(リンテック社製、商品名:SP-PET381031)の剥離処理面を貼り合わせて、剥離フィルム付の硬化性フィルム状接着剤2を得た。
バインダー成分として、フェノキシ樹脂(三菱ケミカル社製、商品名:YX7200B35、重量平均分子量:30,000)100部、環状エーテル基を有する化合物(水添ビスフェノールA型エポキシ樹脂、三菱ケミカル社製、商品名:YX8034)250部、及び、熱カチオン重合開始剤(三新化学工業株式会社製、商品名:SAN-AID SI-B3、反応活性化温度:140℃)2部、シランカップリング剤(信越化学工業社製、商品名:KBM4803)0.2部をメチルエチルケトンに溶解し、固形分濃度35%の塗工液を調製した。
この塗工液を剥離フィルム(リンテック社製、商品名:SP-PET382150)の剥離処理面上に塗工し、得られた塗膜を100℃で2分間乾燥し、厚みが10μmの接着剤層を形成し、その上に、もう1枚の剥離フィルム(リンテック社製、商品名:SP-PET381031)の剥離処理面を貼り合わせて、剥離フィルム付の硬化性フィルム状接着剤3を得た。
イミダゾール系硬化触媒を、1-(2-シアノエチル)-2-ウンデシルイミダゾール(四国化成社製、商品名:C11Z-CN、反応活性化温度:146℃)に変更した以外は、実施例1と同様にして、接着剤組成物4を調製し、剥離フィルム付きの硬化性フィルム状接着剤4を得た。
アクリル系樹脂:アクリル酸メチル(85質量部)、及びアクリル酸-2-ヒドロキシエチル(15質量部)を共重合してなるアクリル系樹脂(重量平均分子量(Mw)60万):100質量部に対して、エポキシ樹脂(商品名「CNA-147」日本化薬株式会社製):15質量部、フェノール樹脂(商品名「ミレックスXLC-4L」三井化学株式会社製):12質量部、球状シリカ(平均粒子径0.05μm、商品名「YA050C-SV2」株式会社アドマテックス製):90質量部、架橋剤(商品名「BHS8515」トーヨーケム株式会社製:1質量部をメチルエチルケトンに溶解又は分散させて、23℃で撹拌することで、固形分濃度が20質量%となる接着剤組成物を得た。
ポリエチレンテレフタレート製フィルム(厚さ38μm)の片面がシリコーン処理により剥離処理された剥離フィルムの前記剥離処理面に、得られた接着剤組成物を塗布し、100℃、2分間乾燥して、厚さ10μmのフィルム状接着剤5を得た。
実施例及び比較例で得られた剥離フィルム付フィルム状接着剤1~5を100℃の環境下に2時間置き、フィルム状接着剤の硬化工程を実施した。硬化工程後の剥離フィルム付フィルム状接着剤から剥離フィルムを除去し、トルエン中に25℃で24時間浸漬して、浸漬前の重量と、浸漬後に乾燥させた重量の差分から、ゲル分率を算出した。
実施例及び比較例で得られた剥離フィルム付フィルム状接着剤1~5から、片側の剥離フィルムを剥離し、露出したフィルム状接着剤の表面を、ガラス板に貼付した。フィルム状接着剤が貼付されたガラス板にゲル分率の測定と同様の条件で硬化工程を実施し、硬化工程後のフィルム状接着剤の全光線透過率を、ヘイズメーター(日本電色工業社製,製品名「NDH2000」)を用いて、JIS K7136:2000に準じて測定した。
実施例1~3、比較1、2で用いた硬化剤主成分、ゲル分率及び全光線透過率の測定結果を、表1にまとめて示す。
Claims (8)
- 環状エーテル基を有する化合物、重合体成分、並びに反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含有し、センサーデバイスを構成する部材に用いられる、硬化性フィルム状接着剤。
- 前記反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種の反応活性化温度が100℃以上である、請求項1に記載の硬化性フィルム状接着剤。
- 前記センサーデバイスが光学センサーデバイスであり、前記硬化性フィルム状接着剤の硬化後の全光線透過率が80%以上である、請求項1又は2のいずれかに記載の硬化性フィルム状接着剤。
- 前記硬化剤が、反応活性化温度が125℃以下のイミダゾール系化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を主成分とするものである、請求項1~3のいずれかに記載の硬化性フィルム状接着剤。
- 前記硬化剤が、反応活性化温度が160℃以下である熱カチオン重合開始剤を含むものである、請求項1~4のいずれかに記載の硬化性フィルム状接着剤。
- 前記重合体成分が、酸変性ポリオレフィン系樹脂を含むものである、請求項1~5のいずれかに記載の硬化性フィルム状接着剤。
- 前記環状エーテル化合物が脂肪族化合物である、請求項1~6のいずれかに記載の硬化性フィルム状接着剤。
- 環状エーテル化合物、重合体成分、並びに反応活性化温度が125℃以下であるイミダゾール化合物及び反応活性化温度が160℃以下である熱カチオン重合開始剤から選ばれる少なくとも一種を含む硬化剤を含有する硬化性フィルム状接着剤を、モジュールを含む部材に貼り付け、80~110℃の範囲の温度に加熱することにより、硬化性フィルム状接着剤を硬化させる工程を含む、デバイスの製造方法。
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