WO2022210261A1 - 硬化性樹脂組成物 - Google Patents
硬化性樹脂組成物 Download PDFInfo
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- WO2022210261A1 WO2022210261A1 PCT/JP2022/013960 JP2022013960W WO2022210261A1 WO 2022210261 A1 WO2022210261 A1 WO 2022210261A1 JP 2022013960 W JP2022013960 W JP 2022013960W WO 2022210261 A1 WO2022210261 A1 WO 2022210261A1
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- HWJYGSDXNANCJM-UHFFFAOYSA-N tridodecyl borate Chemical compound CCCCCCCCCCCCOB(OCCCCCCCCCCCC)OCCCCCCCCCCCC HWJYGSDXNANCJM-UHFFFAOYSA-N 0.000 description 1
- FRGPKMWIYVTFIQ-UHFFFAOYSA-N triethoxy(3-isocyanatopropyl)silane Chemical compound CCO[Si](OCC)(OCC)CCCN=C=O FRGPKMWIYVTFIQ-UHFFFAOYSA-N 0.000 description 1
- VTHOKNTVYKTUPI-UHFFFAOYSA-N triethoxy-[3-(3-triethoxysilylpropyltetrasulfanyl)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCSSSSCCC[Si](OCC)(OCC)OCC VTHOKNTVYKTUPI-UHFFFAOYSA-N 0.000 description 1
- AJSTXXYNEIHPMD-UHFFFAOYSA-N triethyl borate Chemical compound CCOB(OCC)OCC AJSTXXYNEIHPMD-UHFFFAOYSA-N 0.000 description 1
- WZGVRXXJKGXOBR-UHFFFAOYSA-N trihexadecyl borate Chemical compound CCCCCCCCCCCCCCCCOB(OCCCCCCCCCCCCCCCC)OCCCCCCCCCCCCCCCC WZGVRXXJKGXOBR-UHFFFAOYSA-N 0.000 description 1
- KDQYHGMMZKMQAA-UHFFFAOYSA-N trihexyl borate Chemical compound CCCCCCOB(OCCCCCC)OCCCCCC KDQYHGMMZKMQAA-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- QYJYJTDXBIYRHH-UHFFFAOYSA-N trimethoxy-[8-(oxiran-2-ylmethoxy)octyl]silane Chemical compound C(C1CO1)OCCCCCCCC[Si](OC)(OC)OC QYJYJTDXBIYRHH-UHFFFAOYSA-N 0.000 description 1
- WRECIMRULFAWHA-UHFFFAOYSA-N trimethyl borate Chemical compound COB(OC)OC WRECIMRULFAWHA-UHFFFAOYSA-N 0.000 description 1
- AZLXEMARTGQBEN-UHFFFAOYSA-N trinonyl borate Chemical compound CCCCCCCCCOB(OCCCCCCCCC)OCCCCCCCCC AZLXEMARTGQBEN-UHFFFAOYSA-N 0.000 description 1
- GZKLCETYSGSMRA-UHFFFAOYSA-N trioctadecyl borate Chemical compound CCCCCCCCCCCCCCCCCCOB(OCCCCCCCCCCCCCCCCCC)OCCCCCCCCCCCCCCCCCC GZKLCETYSGSMRA-UHFFFAOYSA-N 0.000 description 1
- DTBRTYHFHGNZFX-UHFFFAOYSA-N trioctyl borate Chemical compound CCCCCCCCOB(OCCCCCCCC)OCCCCCCCC DTBRTYHFHGNZFX-UHFFFAOYSA-N 0.000 description 1
- JLPJTCGUKOBWRJ-UHFFFAOYSA-N tripentyl borate Chemical compound CCCCCOB(OCCCCC)OCCCCC JLPJTCGUKOBWRJ-UHFFFAOYSA-N 0.000 description 1
- MDCWDBMBZLORER-UHFFFAOYSA-N triphenyl borate Chemical compound C=1C=CC=CC=1OB(OC=1C=CC=CC=1)OC1=CC=CC=C1 MDCWDBMBZLORER-UHFFFAOYSA-N 0.000 description 1
- NHDIQVFFNDKAQU-UHFFFAOYSA-N tripropan-2-yl borate Chemical compound CC(C)OB(OC(C)C)OC(C)C NHDIQVFFNDKAQU-UHFFFAOYSA-N 0.000 description 1
- LTEHWCSSIHAVOQ-UHFFFAOYSA-N tripropyl borate Chemical compound CCCOB(OCCC)OCCC LTEHWCSSIHAVOQ-UHFFFAOYSA-N 0.000 description 1
- DLVYHYUFIXLWKV-UHFFFAOYSA-N tris(2-ethylhexyl) borate Chemical compound CCCCC(CC)COB(OCC(CC)CCCC)OCC(CC)CCCC DLVYHYUFIXLWKV-UHFFFAOYSA-N 0.000 description 1
- RTMBXAOPKJNOGZ-UHFFFAOYSA-N tris(2-methylphenyl) borate Chemical compound CC1=CC=CC=C1OB(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C RTMBXAOPKJNOGZ-UHFFFAOYSA-N 0.000 description 1
- FYAMVEZOQXNCIE-UHFFFAOYSA-N tris(3-methylphenyl) borate Chemical compound CC1=CC=CC(OB(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 FYAMVEZOQXNCIE-UHFFFAOYSA-N 0.000 description 1
- RQNVJDSEWRGEQR-UHFFFAOYSA-N tris(prop-2-enyl) borate Chemical compound C=CCOB(OCC=C)OCC=C RQNVJDSEWRGEQR-UHFFFAOYSA-N 0.000 description 1
- WAXLMVCEFHKADZ-UHFFFAOYSA-N tris-decyl borate Chemical compound CCCCCCCCCCOB(OCCCCCCCCCC)OCCCCCCCCCC WAXLMVCEFHKADZ-UHFFFAOYSA-N 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
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- C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
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- 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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
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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
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- 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
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- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/36—Silica
Definitions
- the present invention relates to a curable resin composition, an adhesive containing the same, a cured product obtained by curing the same, and a camera module containing the cured product.
- UV-thermosetting adhesives Adhesives that are pre-cured by ultraviolet (UV) irradiation and fully cured by heating (hereinafter referred to as "UV-thermosetting adhesives") are used in many fields, particularly semiconductor devices. It is used for camera module applications (see Patent Documents 1 and 2, for example). When assembling a camera module, it is necessary to position each part with high accuracy. Therefore, the use of a UV-thermosetting adhesive that can be temporarily fixed by temporary curing can improve the manufacturing efficiency.
- UV-thermosetting adhesive that can be temporarily fixed by temporary curing can improve the manufacturing efficiency.
- Adhesives containing polyfunctional acrylate compounds and polyfunctional thiol compounds are known as UV-thermosetting adhesives. Such adhesives are characterized by enethiol reaction (radical addition of thiol group to double bond in (meth)acryloyloxy group), homopolymerization (radical polymerization of (meth)acryloyloxy group) and Michael addition reaction ((meth)acryloyloxy group). ) nucleophilic addition of a thiol group to the double bond in the acryloyloxy group).
- Flare is a phenomenon in which light that does not exist originally is reflected in captured images and videos as a result of unintentional reflection of light incident on the camera from the lens surface, lens barrel, and other parts of the camera. That is.
- UV-thermosetting adhesives give a glossy cured product on the surface, but this is not much of a problem at present.
- problems such as flare in camera modules
- improvement in the properties of UV-thermosetting adhesives is desired in order to reduce the glossiness of the surface of the cured product. ing.
- Patent Document 3 discloses a flexible printed circuit board provided with an antireflection layer or film for preventing flares and ghosts caused by reflection of leaked light caused by the flexible printed circuit board used for signal transmission means inside the camera, and A camera using a flexible printed circuit board is described.
- the method of attaching an antireflection film and the method of providing an antireflection layer are not desirable from the viewpoint of production efficiency.
- Patent Document 3 describes an antireflection layer and a film, but does not describe a liquid adhesive.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a curable resin composition that uses a new mechanism to give a cured product with reduced surface gloss, An object of the present invention is to provide a sealing material containing Another object of the present invention is to provide a cured product obtained by curing the curable resin composition or sealing material. Still another object of the present invention is to provide a camera module containing the cured product.
- the present inventors conducted extensive research to develop a curable resin composition that gives a cured product with reduced surface gloss.
- a thermosetting resin capable of reacting with the former compound other than the latter compound such as an epoxy resin, is used as a specific It has been found that the use of a curable resin composition containing a certain amount significantly reduces the surface gloss of the cured product. Based on the above new findings, the present invention has been completed.
- the present invention includes, but is not limited to, the following inventions.
- the curable resin composition of the present invention in addition to a polyfunctional thiol compound and a compound having a (meth)acrylate group that reacts therewith, is a thermosetting resin other than the latter compound that can react with the former compound, such as epoxy Contains a certain amount of resin. Therefore, the curable resin composition of the present invention gives a cured product with reduced surface gloss.
- a curable resin composition is extremely useful in the manufacture of various semiconductor devices, particularly camera modules, for which reflection of light on the surface of the cured product is a problem.
- FIG. 4 is a photograph showing the appearance of a cured product A obtained by curing the curable resin composition of Example 4.
- FIG. 4 is a photograph showing the appearance of a cured product B obtained by curing the curable resin composition of Comparative Example 1.
- FIG. 2 is an optical microscope photograph (magnification of objective lens: 20 times) of the surface of a cured product A obtained by curing the curable resin composition of Example 4.
- FIG. 2 is an optical microscope photograph (magnification of objective lens: 20 times) of the surface of a cured product B obtained by curing the curable resin composition of Comparative Example 1.
- the curable resin composition of the present invention can react with (A) a polyfunctional thiol compound, (B) a compound having a (meth)acrylate group, and (C) the (A) polyfunctional thiol compound.
- a thermosetting resin having a functional group and not having a (meth)acrylate group and (D) a photoradical initiator are included as essential components.
- resin refers not only to macromolecules (especially synthetic polymers), but also to pre-curing molecules used to produce macromolecules.
- epoxy resin includes materials such as uncured monomers having epoxy groups.
- acrylic acid (or derivatives thereof) and “methacrylic acid” (or derivatives thereof) are collectively referred to as "(meth) acrylic acid”, “(meth) acrylate”, “(meth) acrylic ”, “(meth)acryloyl”, etc. may be used. Each of these terms may be used as an independent term or as part of another term.
- (meth)acrylic acid means “acrylic acid and/or methacrylic acid”
- (meth)acryloyloxy group means “acryloyloxy group and/or methacryloyloxy group”.
- the term “camera” means a device for optically capturing an image, provided with an optical system such as a lens for forming an image, and the imaging wavelength range includes the visible light range, the infrared range, and the ultraviolet range. including. Therefore, the “camera” includes not only cameras that mainly capture the visible light region used in devices such as smartphones, tablet computers and notebook PCs, but also thermal cameras and ToF cameras that measure the distance to an object. Also included are cameras that detect wavelengths in the (near) infrared region, which are used in (Time of Flight) devices. The use of the camera is not particularly limited, and it can be used not only for devices such as smartphones, but also for in-vehicle use, counting and inspection in factories, and monitoring inside and outside buildings. Also, in this specification, a “camera module” is a device obtained by modularizing the main part of the camera.
- the curable resin composition of the present invention contains at least one polyfunctional thiol compound.
- the polyfunctional thiol compound used in the present invention is not particularly limited as long as it is a compound having two or more thiol groups.
- Polyfunctional thiol compound preferably contains a thiol compound having three or more thiol groups, a thiol compound having three thiol groups (trifunctional thiol compound) and / or a thiol compound having four thiol groups (tetrafunctional thiol compounds).
- the polyfunctional thiol compound includes a thiol compound having three thiol groups.
- the polyfunctional thiol compound comprises a thiol compound having four thiol groups.
- the thiol equivalent of the polyfunctional thiol compound is preferably 90-150 g/eq, more preferably 90-140 g/eq.
- the polyfunctional thiol compound contains a non-hydrolyzable polyfunctional thiol compound that does not have a hydrolyzable partial structure such as an ester bond from the viewpoint of improving the moisture resistance of the cured product. is preferred.
- a non-hydrolyzable polyfunctional thiol compound is hardly hydrolyzed even in a hot and humid environment.
- hydrolyzable polyfunctional thiol compounds include trimethylolpropane tris (3-mercaptopropionate) (manufactured by SC Organic Chemical Co., Ltd.: TMMP), tris-[(3-mercaptopropionyloxy)-ethyl]- Isocyanurate (manufactured by SC Organic Chemical Co., Ltd.: TEMPIC), pentaerythritol tetrakis (3-mercaptopropionate) (manufactured by SC Organic Chemical Co., Ltd.: PEMP), tetraethylene glycol bis (3-mercaptopropionate) (SC Organic Chemical Co., Ltd.: EGMP-4), dipentaerythritol hexakis (3-mercaptopropionate) (manufactured by SC Organic Chemical Co., Ltd.: DPMP), pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko
- a preferred non-hydrolyzable polyfunctional thiol compound that can be used in the present invention has the following formula (1): (In the formula, R 1 and R 2 are each independently selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 12 carbon atoms, or a phenyl group; R 3 , R 4 , R 5 and R 6 are each independently selected from the group consisting of mercaptomethyl, mercaptoethyl and mercaptopropyl groups) It is a compound represented by Examples of the compound represented by formula (1) include 1,3,4,6-tetrakis(2-mercaptoethyl)glycoluril (trade name: TS-G, manufactured by Shikoku Kasei Kogyo Co., Ltd.), (1, 3,4,6-tetrakis(3-mercaptopropyl)glycoluril (trade name: C3 TS-G, manufactured by Shikoku Kasei Co., Ltd.), 1,3,4,6-tetraki
- Another preferred non-hydrolyzable polyfunctional thiol compound that can be used in the present invention is the following formula (2): (R 8 ) m -A-(R 7 -SH) n (2)
- A is a residue of a polyhydric alcohol having n + m hydroxyl groups, containing n + m oxygen atoms derived from the hydroxyl groups, each R 7 is independently an alkylene group having 1 to 10 carbon atoms, each R 8 is independently a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; m is an integer of 0 or more, n is an integer of 3 or more, each of said R 7 and R 8 is bound to said A through one of said oxygen atoms) It is a compound represented by Two or more of the compounds represented by formula (2) may be used in combination.
- Examples of the compound represented by Formula (2) include pentaerythritol trippropanethiol (trade name: Multiiol Y-3, manufactured by SC Organic Chemical Co., Ltd.), pentaerythritol tetrapropanethiol, and the like. Among these, pentaerythritol trippropanethiol is particularly preferred.
- non-hydrolyzable polyfunctional thiol compound it is also possible to use a tri- or higher functional polythiol compound having two or more sulfide bonds in the molecule.
- thiol compounds include 1,2,3-tris(mercaptomethylthio)propane, 1,2,3-tris(2-mercaptoethylthio)propane, 1,2,3-tris(3-mercapto propylthio)propane, 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane, 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiundecane, 4,7- dimercaptomethyl-1,11-dimercapto-3,6,9-trithiundecane, 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiundecane, tetrakis(mercaptomethylthiomethyl) Methan
- the curable resin composition of the present invention is a compound having a (meth)acrylate group, that is, one molecule of a compound having one or more hydroxyl groups contains one or more ( It contains at least one compound having a structure esterified with meth)acrylic acid (there may be an unesterified hydroxyl group).
- a silane coupling agent having a (meth)acrylate group is not included in compounds having a (meth)acrylate group.
- compounds with (meth)acrylate groups do not contain silicon atoms.
- Compounds having a (meth)acrylate group used in the present invention may include compounds having only one (meth)acrylate group, i.e., monofunctional (meth)acrylate compounds. It is preferred to include compounds having more than one, i.e. polyfunctional (meth)acrylate compounds.
- compounds having (meth)acrylate groups include multifunctional (meth)acrylate compounds.
- the polyfunctional (meth)acrylate compound is preferably bifunctional to tetrafunctional, more preferably bifunctional. If the number of (meth)acrylate groups in one molecule is too large, the crosslink density becomes too high during temporary curing by UV irradiation, and the temporary cured product becomes difficult to deform during subsequent curing by heat, and flare is suppressed.
- the molecular weight of the compound having a (meth)acrylate group is preferably 100-5000, more preferably 200-3000.
- a compound having a (meth)acrylate group may contain a (meth)acryloyl group that is not in the form of a (meth)acryloyloxy group, as long as it satisfies the above structural requirements.
- Examples of compounds having a (meth)acrylate group include - a di(meth)acrylate of bisphenol A (or its pegylated form); - di(meth)acrylate of dimethyloltricyclodecane; - di(meth)acrylate of tris(2-hydroxyethyl)isocyanurate; - tri(meth)acrylate of tris(2-hydroxyethyl) isocyanurate; - tri(meth)acrylate of trimethylolpropane, or oligomers thereof; - poly(meth)acrylates of ditrimethylolpropane; - tri(meth)acrylates of pentaerythritol, or oligomers thereof; - poly(meth)acrylates of dipentaerythritol - polyester acrylates (multifunctional) etc. can be mentioned.
- - poly(meth)acrylates of tris(acryloxyethyl) isocyanurate As another example, - poly(meth)acrylates of tris(acryloxyethyl) isocyanurate; - poly(meth)acrylates of caprolactone-modified tris(acryloxyethyl)isocyanurates; - poly(meth)acrylates of caprolactone-modified tris(methacryloxyethyl) isocyanurates; - poly(meth)acrylates of alkyl-modified dipentaerythritol; -Poly(meth)acrylate of caprolactone-modified dipentaerythritol and the like can be mentioned. Examples of commercially available compounds having a (meth)acrylate group include Toagosei Co., Ltd.
- polyester acrylate (trade name: Aronix M-7100), Kyoeisha Chemical Co., Ltd. dimethylol-tricyclodecane diacrylate (trade name: light acrylate DCP-A), polyester acrylate (trade name: EBECRYL810) manufactured by Daicel Allnex Co., Ltd., and the like.
- These (meth)acrylate group-containing compounds may be used alone or in combination of two or more.
- Thermosetting resin has a functional group capable of reacting with the polyfunctional thiol compound (more precisely, the thiol group therein), and has a (meth)acrylate group.
- a functional group capable of reacting with a thiol group may be referred to as a "reactive functional group”.
- Reactive functional groups include not only epoxy groups but also functional groups having double bonds such as maleimide groups.
- the reactive functional groups are preferably epoxy groups.
- the thermosetting resin comprises an epoxy resin or a maleimide resin, preferably an epoxy resin.
- Epoxy resins that can be used in the present invention are described below. Epoxy resins are roughly classified into monofunctional epoxy resins and polyfunctional epoxy resins. In the present invention, the epoxy resin preferably contains a polyfunctional epoxy resin. In some aspects of the invention, epoxy resins include multifunctional epoxy resins and monofunctional epoxy resins.
- a monofunctional epoxy resin is an epoxy resin containing one epoxy group.
- monofunctional epoxy resins include n-butyl glycidyl ether, 2-ethylhexyl glycidyl ether, phenyl glycidyl ether, cresyl glycidyl ether, p-s-butylphenyl glycidyl ether, styrene oxide, ⁇ -pinene oxide, 4-tert.
- a polyfunctional epoxy resin is an epoxy resin containing two or more epoxy groups. Polyfunctional epoxy resins are roughly classified into aliphatic polyfunctional epoxy resins and aromatic polyfunctional epoxy resins. Aliphatic polyfunctional epoxy resins are polyfunctional epoxy resins having structures that do not contain aromatic rings.
- aliphatic polyfunctional epoxy resins include: - (poly)ethylene glycol diglycidyl ether, (poly)propylene glycol diglycidyl ether, butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, poly Tetramethylene ether glycol diglycidyl ether, glycerin diglycidyl ether, neopentyl glycol diglycidyl ether, 1,2-epoxy-4-(2-methyloxiranyl)-1-methylcyclohexane, cyclohexane type diglycidyl ether, dicyclo diepoxy resins such as pentadiene-type diglycidyl ethers; - triepoxy resins such as trimethylolpropane triglycidyl ether,
- aromatic polyfunctional epoxy resin is a polyfunctional epoxy resin having a structure containing an aromatic ring.
- Many conventional epoxy resins such as bisphenol A type epoxy resin, are of this type.
- aromatic polyfunctional epoxy resins include: - bisphenol A type epoxy resin; - branched polyfunctional bisphenol A type epoxy resins such as p-glycidyloxyphenyldimethyltrisbisphenol A diglycidyl ether; - bisphenol F type epoxy resin; - novolac type epoxy resins; - tetrabromobisphenol A type epoxy resin; - a fluorene-type epoxy resin; - biphenyl aralkyl epoxy resins; - diepoxy resins such as 1,4-phenyldimethanol diglycidyl ether; -biphenyl-type epoxy resins such as 3,3',5,5'-tetramethyl-4,4'-diglycidyloxybiphenyl; -glycidylamine type epoxy resins such as dig
- the epoxy equivalent of the epoxy resin is preferably 90 to 500 g/eq, more preferably 100 to 450 g/eq, even more preferably 100 to 300 g/eq.
- a silane coupling agent having a reactive functional group such as an epoxy group is not included in the thermosetting resin.
- the thermosetting resin does not contain silicon atoms.
- the curable resin composition of the present invention contains a photoradical initiator.
- a photoradical initiator By using a photoradical initiator, the curable resin composition of the present invention can be temporarily cured by UV irradiation.
- the photoradical initiator that can be used in the present invention is not particularly limited, and known ones can be used.
- photoradical initiators include 1-hydroxycyclohexylphenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, diethoxyacetophenone, 1-(4-isopropylphenyl)-2-hydroxy- 2-methylpropan-1-one, 1-(4-dodecylphenyl)-2-hydroxy-2-methylpropan-1-one, 4-(2-hydroxyethoxy)-phenyl(2-hydroxy-2-propyl) Ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin phenyl ether, benzyl dimethyl ketal, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone,
- total number of (meth) acrylate groups contained in the compound having the (B) (meth) acrylate group] + [contained in the (C) thermosetting resin, capable of reacting with the (A) polyfunctional thiol compound Total number of functional groups]) / [total number of thiol groups contained in the (A) polyfunctional thiol compound] 0.5 to 1.5 is preferably This ratio is more preferably 0.6 to 1.4, more preferably 0.8 to 1.2. The fact that such a relationship is satisfied indicates that relatively few (meth)acrylate groups, reactive functional groups and thiol groups remain unreacted in the cured product after the curing reaction. When the number of unreacted groups remaining in the cured product is small, new crosslinks are less likely to be formed even when used in a high-temperature environment, and the physical properties of the cured product are stabilized.
- the total number of thiol groups contained in the polyfunctional thiol compound is the quotient obtained by dividing the mass (g) of the polyfunctional thiol compound contained in (A) the polyfunctional thiol compound by the thiol equivalent of the polyfunctional thiol compound. be.
- the total number of thiol groups is the sum of such quotients for each multifunctional thiol compound.
- a thiol equivalent can be determined by an iodometric titration method. This method is widely known and disclosed, for example, in paragraph 0079 of JP-A-2012-153794. If the thiol equivalent cannot be determined by this method, it may be calculated as a quotient obtained by dividing the molecular weight of the thiol compound by the number of thiol groups in one molecule of the thiol compound.
- the total number of (meth)acrylate groups contained in the compound having a (meth)acrylate group is the mass (g ) divided by the (meth)acrylate equivalent weight of the compound.
- the total number of (meth)acrylate groups is the sum of such quotients for each of those compounds.
- the (meth)acrylate equivalent is calculated as a quotient obtained by dividing the molecular weight of the compound having the (meth)acrylate group by the number of (meth)acrylate groups in one molecule of the compound.
- thermosetting resin The total number of reactive functional groups contained in the thermosetting resin is calculated by dividing the mass (g) of the thermosetting resin contained in the (C) thermosetting resin into the reactive functional group equivalent of the thermosetting resin. (if more than one type of reactive functional group is included, the sum of such quotients for each reactive functional group). When more than one thermosetting resin is included, this total number of reactive functional groups is the sum of such quotients for each thermosetting resin.
- the epoxy equivalent can be determined by the method described in JIS K7236. If the epoxy equivalent cannot be obtained by this method, it may be calculated as a quotient obtained by dividing the molecular weight of the thermosetting resin by the number of epoxy groups in one molecule of the thermosetting resin. Even when the reactive functional groups are groups other than epoxy groups, it is easy for those skilled in the art to determine the total number of reactive functional groups.
- the curable composition of the present invention may optionally contain optional components other than the above (A) to (D), such as those described below, if desired.
- the curable resin composition of the present invention may contain a curing catalyst, if desired.
- a curing catalyst is used to cure the (C) thermosetting resin.
- the curable resin composition of the present invention can be cured in a short time even under low temperature conditions.
- the curing catalyst is not particularly limited as long as it is a curing catalyst capable of curing the thermosetting resin (C), and a known one may be used. can be done.
- an appropriate curing catalyst selected from known curing catalysts for epoxy resins can be used.
- the curing catalyst for epoxy resins is preferably a latent curing catalyst.
- a latent curing catalyst is a compound that is inactive at room temperature and is activated by heating to function as a curing catalyst.
- latent curing catalysts for epoxy resins include imidazole compounds that are solid at room temperature; solid-dispersed amine adduct-based latent curing catalysts such as reaction products of amine compounds and epoxy compounds (amine-epoxy adduct system); amine compounds and an isocyanate compound or a reaction product of a urea compound (urea type adduct system).
- Typical examples of commercially available latent curing catalysts for epoxy resins include amine-epoxy adduct system (amine adduct system) such as “Amicure PN-23” (trade name of Ajinomoto Fine-Techno Co., Ltd.), “Amicure PN-40” (Ajinomoto Fine-Techno Co., Ltd. trade name), “Amicure PN-50” (Ajinomoto Fine-Techno Co., Ltd. trade name), “Novacure HX-3742” (Asahi Kasei Co., Ltd. trade name), “Novacure HX -3721” (Asahi Kasei Corp.
- amine adduct system such as "Amicure PN-23” (trade name of Ajinomoto Fine-Techno Co., Ltd.), “Amicure PN-40” (Ajinomoto Fine-Techno Co., Ltd. trade name), “Amicure PN-50” (Ajinomoto Fine-
- the curing catalyst may be used alone or in combination of two or more. From the viewpoint of pot life and curability, the curing catalyst is preferably a solid-dispersed amine adduct latent curing catalyst.
- Some curing catalysts for epoxy resins are provided in the form of dispersions dispersed in polyfunctional epoxy resins.
- the amount of the polyfunctional epoxy resin in which it is dispersed is also the amount of the epoxy resin as the (C) thermosetting resin in the curable resin composition of the present invention.
- Pigment The curable resin composition of the present invention may contain a pigment, if desired. By including a pigment, the chromaticity of the curable resin composition of the present invention can be adjusted. By containing a pigment, the curable resin composition of the present invention can further reduce the influence of unintended light on the image sensor (imaging device) in the camera module.
- Pigments are not particularly limited, but for example, black organic pigments, mixed-color organic pigments, carbon black, titanium black, other inorganic pigments, and the like can be used. Examples of black organic pigments include perylene black and aniline black, and examples of mixed organic pigments include pseudo-blackening by mixing at least two pigments selected from red, blue, green, purple, yellow, magenta, cyan, and the like.
- inorganic pigments include graphite, fine particles of metals and their oxides (including composite oxides), sulfides, and nitrides.
- the metals include titanium, copper, iron, manganese, cobalt, chromium, nickel, zinc, calcium, silver and the like.
- the pigment may be used alone or in combination of two or more. Pigments may also be used in combination with other colorants such as dyes.
- the pigment preferably contains a black pigment, more preferably titanium black. From the viewpoint of achieving both UV transmittance and opacity, the average particle size of the primary particles of the pigment is preferably 20 to 200 nm, more preferably 50 to 150 nm.
- the average particle diameter of the primary particles of the pigment refers to the volume-based median diameter (d50) measured by the laser diffraction method according to ISO-13320 (2009). If the measurement by the laser diffraction method is difficult (for example, if the object to be measured contains fine particles to which the laser diffraction method is difficult to apply), the average particle size of the primary particles to be measured may be measured by another measurement method. good. Examples of other measuring methods include measurement by observation with a scanning electron microscope (SEM), dynamic light scattering method, calculation from specific surface area, and the like. In the present invention, in such a case, it is preferable to calculate the average particle diameter of the primary particles to be measured from the measurement by SEM observation.
- SEM scanning electron microscope
- the curable resin composition of the present invention may contain a filler, if desired.
- a filler improves the moisture resistance and thermal cycle resistance, particularly thermal cycle resistance, of the adhered portion.
- the reason why the thermal cycle resistance is improved by adding a filler is that the coefficient of linear expansion of the cured product is reduced, that is, expansion and contraction of the cured product due to thermal cycles are suppressed.
- the filler is not particularly limited as long as it has the effect of reducing the coefficient of linear expansion, and various fillers can be used.
- specific examples of fillers include inorganic fillers such as silica fillers, alumina fillers, talc fillers and calcium carbonate fillers, and organic fillers such as polytetrafluoroethylene (PTFE) fillers and acrylic polymer fillers.
- inorganic fillers particularly silica fillers, calcium carbonate fillers, and alumina fillers are preferred, and silica fillers and calcium carbonate fillers are more preferred.
- the filler may be surface-treated with a surface-treating agent such as a silane coupling agent (which may have a substituent such as a phenyl group, a vinyl group, an acryloyl group, or a methacryloyl group). .
- a surface-treating agent such as a silane coupling agent (which may have a substituent such as a phenyl group, a vinyl group, an acryloyl group, or a methacryloyl group).
- a surface-treating agent such as a silane coupling agent (which may have a substituent such as a phenyl group, a vinyl group, an acryloyl group, or a methacryloyl group).
- the particle size distribution, average particle size, etc. of the filler are not particularly limited, it is preferable to use a filler having an average particle size of 5.0 ⁇ m or less.
- the average particle size of the filler is preferably 4.0 ⁇ m or less, more preferably 3.0 ⁇ m or less. If the average particle size is more than 5.0 ⁇ m, the depth of pre-curing by UV irradiation is reduced, making pre-curing difficult.
- the lower limit of the average particle size is not particularly limited. However, if the average particle size is less than 0.1 ⁇ m, the viscosity tends to increase, so the average particle size is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more.
- the filler used in the present invention has an average particle size of 0.1 ⁇ m or more and 5.0 ⁇ m or less, preferably 0.2 ⁇ m or more and 3.0 ⁇ m or less.
- the average particle diameter of the filler refers to the volume-based median diameter (d50) measured by the laser diffraction method according to ISO-13320 (2009).
- the filler used in the present invention preferably has a spherical shape from the viewpoint of dischargeability from a dispenser.
- the amount of the filler is preferably 5 to 60% by mass, more preferably 10 to 50% by mass, based on the total curable resin composition. It is preferably 10 to 30% by mass, and more preferably 10 to 30% by mass.
- the curable resin composition of the present invention may contain a stabilizer, if desired.
- a stabilizer can be added to the curable resin composition of the present invention in order to improve its storage stability and prolong its pot life.
- Various stabilizers known in the art can be used as stabilizers for one-liquid type adhesives. At least one selected is preferred.
- liquid borate compounds include 2,2′-oxybis(5,5′-dimethyl-1,3,2-oxaborinane), trimethylborate, triethylborate, tri-n-propylborate, triisopropylborate, tri-n-butylborate, tripentylborate, triallylborate, trihexylborate, tricyclohexylborate, trioctylborate, trinonylborate, tridecylborate, tridodecylborate, trihexadecylborate, trioctadecylborate, tris( 2-ethylhexyloxy)borane, bis(1,4,7,10-tetraoxaundecyl)(1,4,7,10,13-pentoxatetradecyl)(1,4,7-trioxaundecyl) ) borane, tribenzylborate, triphenylborate, tri-
- liquid borate ester compound is liquid at room temperature (25° C.), it is preferable because the viscosity of the formulation can be kept low.
- aluminum chelate for example, aluminum chelate A (manufactured by Kawaken Fine Chemicals Co., Ltd.) can be used.
- organic acid for example, barbituric acid can be used.
- the amount of the stabilizer is 0.01 to 10 parts by mass with respect to 100 parts by mass of the total amount of components (A) to (D). It is preferably from 0.05 to 5 parts by mass, and even more preferably from 0.1 to 3 parts by mass.
- the curable resin composition of the present invention may contain a coupling agent, if desired.
- Addition of a coupling agent, particularly a silane coupling agent, is preferable from the viewpoint of improving adhesive strength.
- a silane coupling agent is an organosilicon compound having two or more different functional groups in its molecule, including a functional group that can chemically bond with an inorganic material and a functional group that can chemically bond with an organic material.
- a functional group capable of chemically bonding with an inorganic material is a hydrolyzable silyl group, and an alkoxy group, especially a silyl group containing a methoxy group and/or an ethoxy group is used as this functional group.
- silane coupling agents As functional groups capable of chemically bonding with organic materials, vinyl groups, epoxy groups, (meth)acrylic groups, styryl groups, unsubstituted or substituted amino groups, mercapto groups, ureido groups, isocyanate groups and the like are used.
- the coupling agent various silane coupling agents having the above functional groups can be used. Specific examples of silane coupling agents include 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, vinyltrimethoxysilane, 3-triethoxysilyl-N-(1,3-dimethyl-butylidene).
- silane coupling agents may be used alone or in combination of two or more.
- the silane coupling agent (including those used for the surface treatment of the filler) has a (meth)acryloyl group or a reactive functional group such as an epoxy group. Not included in (D).
- the amount of the coupling agent is 0.01 parts by mass to 10 parts by mass with respect to 100 parts by mass of the total amount of components (A) to (D) from the viewpoint of improving the adhesive strength. and more preferably 0.1 to 5 parts by mass.
- the curable resin composition of the present invention may contain a thixotropic agent, if desired.
- the thixotropic agent used in the present invention is not particularly limited, and known ones can be used. Examples of thixotropic agents for use in the present invention include, but are not limited to, silica, bentonite, calcium carbonate, and the like.
- the thixotropic agent preferably contains silica.
- Silica may be natural silica (silica stone, quartz, etc.) or synthetic silica. Synthetic silica can be synthesized by any method, including dry and wet methods.
- the thixotropic agent may also be surface treated with a surface treatment agent (eg, polydimethylsiloxane). In the present invention, at least part of the thixotropic agent is preferably surface-treated.
- the average particle size of the primary particles of the thixotropic agent is preferably 5 to 50 nm.
- the curable resin composition of the present invention preferably contains 0.1 to 30% by weight, more preferably 1 to 20% by weight, of the thixotropic agent relative to the total weight of the curable resin composition. A content of ⁇ 10% by weight is particularly preferred.
- the curable resin composition of the present invention may contain other additives, such as ion trapping agents, leveling agents, antioxidants, antifoaming agents, if desired, within the scope of the present invention. , flame retardants, solvents, and the like.
- additives such as ion trapping agents, leveling agents, antioxidants, antifoaming agents, if desired, within the scope of the present invention. , flame retardants, solvents, and the like.
- the type and amount of each additive are as per conventional methods.
- the method for producing the curable resin composition of the present invention is not particularly limited.
- components (A) to (D) and, if desired, other additives are simultaneously or separately introduced into a suitable mixer and mixed by stirring while melting by heating if necessary, By forming a uniform composition, the curable resin composition of the present invention can be obtained.
- the mixer is not particularly limited, but a Raikai machine equipped with a stirring device and a heating device, a Henschel mixer, a three-roll mill, a ball mill, a planetary mixer, a bead mill, or the like can be used. Also, these devices may be used in combination as appropriate.
- the curable resin composition thus obtained is, as described above, It can be converted into a final cured product by subjecting it to a two-stage curing treatment including a temporary curing treatment by ultraviolet (UV) irradiation and a final curing treatment by heating.
- a two-stage curing treatment including a temporary curing treatment by ultraviolet (UV) irradiation and a final curing treatment by heating.
- the temporary curing treatment can be performed at room temperature by causing the curable resin composition of the present invention to receive a sufficient cumulative amount of ultraviolet rays.
- the irradiation intensity is preferably 100-10000 mW/cm 2 , more preferably 1000-9000 mW/cm 2 .
- the wavelength of the ultraviolet rays is preferably 315-450 nm, more preferably 340-430 nm, and particularly preferably 350-380 nm.
- the ultraviolet light source is not particularly limited, and a high-pressure mercury lamp, a metal halide lamp, a gallium nitride UV-LED, or the like can be used.
- the integrated amount of ultraviolet light received by the curable resin composition of the present invention is preferably 200 mJ/cm 2 or more, more preferably 500 mJ/cm 2 or more, still more preferably 1000 mJ/cm 2 or more, and particularly It is preferably 2000 mJ/cm 2 or more.
- the integrated amount of ultraviolet light can be measured using a measuring instrument commonly used in the relevant field, such as an integrated ultraviolet light meter and a light receiver.
- the integrated amount of light in the ultraviolet wavelength region (310 to 390 nm) with a center wavelength of 365 nm can be measured using an ultraviolet integrating photometer (Ushio Inc., UIT-250) and a light receiver (Ushio Inc., UVD-S365). ) can be measured using
- the main curing treatment can be performed by heating the curable resin composition of the present invention after the temporary curing treatment under appropriate conditions.
- This heating is preferably carried out at 60 to 120°C, more preferably 60 to 100°C, particularly preferably 70 to 90°C.
- This heating is preferably carried out for 5 to 180 minutes, more preferably for 10 to 120 minutes, particularly preferably for 20 to 70 minutes.
- the curable resin composition of the present invention When the curable resin composition of the present invention is subjected to the above temporary curing and final curing treatments, it gives a cured product with reduced surface gloss.
- the reason why the gloss is reduced is that there is a structure with fine bumps on the surface of this cured product, and when it is irradiated with light, the reflection is mainly diffuse reflection, and the specular reflection is reduced. is.
- An example of such a fine projection structure is shown in FIG.
- the mechanism by which this fine protrusion structure occurs is that when the curable resin composition of the present invention is subjected to temporary curing treatment, part of the (C) thermosetting resin that did not participate in the curing reaction becomes a continuous phase (after curing (corresponds to the white areas in FIG.
- the glossiness of the surface of an object can be evaluated by specular glossiness measured at an incident angle of 60° in accordance with JIS Z 8741.
- the specular gloss of the cured product provided by the curable resin composition of the present invention is preferably 15% or less, more preferably 10% or less, and even more preferably 5% or less.
- the curable resin composition of the present invention can be used as an adhesive or sealing material.
- the resin composition of the present invention can be used for adhesion and sealing of camera module parts.
- the curable resin composition of the present invention can be used for adhesion between a holder 70 and a substrate 20 as shown in FIG. 1 in the manufacture of camera modules.
- the curable resin composition of the present invention can be used for bonding the lens barrel 60 and the holder 70 together.
- the curable resin composition of the present invention can be used for bonding the optical filter 50 and the holder 70 together.
- An air dispenser or the like can be used to supply the resin composition to the adherend surface.
- the curable resin composition of the present invention is used for bonding the holder 70 to the substrate 20, for bonding the lens barrel 60 to the holder 70, or for bonding the optical filter 50 to the holder 70. is also provided.
- the curable resin composition of the present invention is, for example, a semiconductor device containing various electronic components (especially those in which it is important to suppress reflection of light inside), and parts that constitute electronic components. It can be used as an adhesive or a raw material thereof.
- the present invention also provides an adhesive containing the curable resin composition of the present invention.
- the adhesive of the present invention is suitable, for example, for fixing parts constituting a camera module.
- the curable resin composition or adhesive of the present invention is for suppressing flare in imaging.
- the curable resin composition or adhesive of the present invention for providing a cured product having a fine projection structure on its surface is also provided.
- the present invention also provides a cured product obtained by curing the curable resin composition or adhesive of the present invention.
- the present invention further provides a camera module containing the cured product of the present invention.
- Examples 1-13, Comparative Examples 1-3 A curable resin composition was prepared according to the formulation shown in Table 1 by mixing predetermined amounts of each component using a three-roll mill. In Table 1, the amount of each component is expressed in parts by mass (unit: g).
- (A) Polyfunctional thiol compound In the examples and comparative examples, the compounds used as (A) the polyfunctional thiol compound are as follows. (A-1): Pentaerythritol tetrakis(3-mercaptopropionate) (trade name: PEMP, manufactured by SC Organic Chemical Co., Ltd., thiol equivalent: 122) (A-2): Pentaerythritol trippropanethiol (trade name: Multithiol Y-3, manufactured by SC Organic Chemical Co., Ltd., thiol equivalent: 140)
- (B) Compound Having (Meth)Acrylate Group the compound used as the compound having (B) (meth)acrylate group is as follows.
- (C) Thermosetting resin In the examples and comparative examples, the compounds used as the (C) thermosetting resin are as follows.
- (D) Photoradical Initiator The compounds used as (D) photoradical initiator in Examples and Comparative Examples are as follows.
- (E) Curing Catalyst Compounds used as (E) curing catalyst in Examples and Comparative Examples are as follows.
- the epoxy resin that constitutes this dispersion is treated as forming a part of (C) the thermosetting resin. Therefore, in Table 1, the amount of only the latent curing catalyst in (E-1) is shown in the column of (E) curing catalyst, and the amount of the epoxy resin in (E-1) is the amount of (C) the thermosetting resin. column.
- (F) Pigment Compounds used as (F) pigment in Examples and Comparative Examples are as follows.
- F-2) Carbon black trade name: Black 4, manufactured by Orion Engineered Carbons Co., Ltd.
- (G) Filler Compounds used as (G) filler in Examples and Comparative Examples are as follows.
- the curable resin composition was printed on a glass flat plate of 25 mm ⁇ 75 mm ⁇ 1.5 mm by stencil printing so as to form a rectangle of 15 mm ⁇ 50 mm (thickness: 0.3 mm).
- the printed curable resin composition is measured using a UV LED irradiation device AC475 manufactured by Excelitas Technologies Inc. with an integrated light amount of 2000 mJ/cm 2 (Ushio Inc. UIT-250 (connected to a receiver UVD-365). ) and temporarily cured by UV irradiation.
- the temporarily cured curable resin composition was fully cured at 80° C.
- the curable resin composition was printed on a 3 cm ⁇ 4 cm ⁇ 0.3 mm stainless steel (SUS304) plate by stencil printing so as to form a circle of 2 mm ⁇ .
- the composition after printing had a diameter of 2 mm and a thickness of 0.13 mm.
- Alumina chips each measuring 1.5 mm ⁇ 3 mm ⁇ 0.5 mm were placed on the printed curable resin composition.
- the curable resin composition was irradiated with UV LED irradiation equipment AC475 manufactured by Excelitas Technologies, Inc. with an integrated light quantity of 2000 mJ/cm 2 (measured with UIT-250 manufactured by Ushio Inc. (connected to UVD-365 receiver)).
- the alumina chip was adhered to the stainless steel plate by pre-curing by UV irradiation.
- the adhesion strength due to temporary curing by UV irradiation is preferably 2.5 N or more, more preferably 5 N or more.
- FIG. 3 shows a photograph showing the appearance of a cured product B obtained in the same manner as described above except that the curable resin composition of Comparative Example 1 was used as the curable resin composition.
- FIG. 4 an optical microscope photograph of the surface of the cured product A is shown in FIG. 4, and an optical microscope photograph of the surface of the cured product B is shown in FIG.
- FIGS. 4 and 5 were taken with an objective lens magnification of 20 times, and the width (horizontal length) corresponds to 0.7 mm.
- the curable resin composition of the present invention has sufficient adhesive strength after temporary curing, and gives a cured product with reduced surface gloss, whereas the curable resin composition not included in the scope of the present invention is , giving a cured product with insufficient adhesive strength after temporary curing or with insufficiently reduced surface gloss.
- Microscopic observation of the surfaces of the cured product A of Example and the cured product B of Comparative Example reveals that the surfaces are not completely flat.
- the former has a structure in which protrusions are significantly more conspicuous than the latter. Therefore, it is considered that the cured products of Examples have significantly reduced specular glossiness, whereas the cured products of Comparative Examples have insufficiently reduced specular glossiness.
- the curable resin composition of the present invention in addition to a polyfunctional thiol compound and a compound having a (meth)acrylate group that reacts therewith, is a thermosetting resin other than the latter compound that can react with the former compound, such as epoxy Contains a certain amount of resin. Therefore, the curable resin composition of the present invention gives a cured product with reduced surface gloss.
- a curable resin composition is extremely useful in the manufacture of various semiconductor devices, particularly camera modules, for which reflection of light on the surface of the cured product is a problem.
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Abstract
Description
下記(A)~(D):
(A)多官能チオール化合物
(B)(メタ)アクリレート基を有する化合物
(C)前記(A)多官能チオール化合物と反応しうる官能基を有し、(メタ)アクリレート基を有しない、熱硬化性樹脂
(D)光ラジカル開始剤
を含み、
[(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.20~0.65である、
硬化性樹脂組成物。
[2]
[(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.30~0.60である、前項1記載の硬化性樹脂組成物。
[3]
([(B)(メタ)アクリレート基を有する化合物に含まれる(メタ)アクリレート基の総数]+[(C)熱硬化性樹脂に含まれる、(A)多官能チオール化合物と反応しうる官能基の総数])/[(A)多官能チオール化合物に含まれるチオール基の総数]=0.5~1.5である、前項1又は2記載の硬化性樹脂組成物。
[4]
(B)(メタ)アクリレート基を有する化合物が多官能アクリレート化合物を含む、前項1~3いずれか一項記載の硬化性樹脂組成物。
[5]
(C)熱硬化性樹脂がエポキシ樹脂を含む、前項1~4のいずれか一項記載の硬化性樹脂組成物。
[6]
(E)硬化触媒を更に含む、前項1~5のいずれか一項記載の硬化性樹脂組成物。
[7]
(F)顔料を更に含む、前項1~6のいずれか一項記載の硬化性樹脂組成物。
[8]
(F)顔料が黒色顔料を含む、前項7記載の硬化性樹脂組成物。
[9]
(G)フィラーを更に含む、前項1~8のいずれか一項記載の硬化性樹脂組成物。
[10]
JIS Z 8741の規定に従い、入射角60°で測定した鏡面光沢度が15%以下である硬化物を与える、前項1~9のいずれか一項記載の硬化性樹脂組成物。
[11]
カメラモジュールにおいて、ホルダを基板へ接着するため、レンズバレルをホルダに接着するため、又は、光学フィルタをホルダに接着するための、前項1~10のいずれか一項記載の硬化性樹脂組成物。
[12]
前項1~11のいずれか1項記載の硬化性樹脂組成物を含む、接着剤。
[13]
前項1~11のいずれか1項記載の硬化性樹脂組成物、又は前項12に記載の接着剤の硬化物。
[14]
前項13記載の硬化物を含む、カメラモジュール。
本発明の硬化性樹脂組成物は、多官能チオール化合物を少なくとも1種含む。
本発明において用いられる多官能チオール化合物は、チオール基を2つ以上有する化合物である限り特に限定されない。多官能チオール化合物は、チオール基を3つ以上有するチオール化合物を含むことが好ましく、チオール基を3つ有するチオール化合物(3官能チオール化合物)及び/又はチオール基を4つ有するチオール化合物(4官能チオール化合物)を含むことがより好ましい。
本発明のある態様においては、多官能チオール化合物は、チオール基を3つ有するチオール化合物を含む。本発明の別態様においては、多官能チオール化合物は、チオール基を4つ有するチオール化合物を含む。多官能チオール化合物のチオール当量は、90~150g/eqであることが好ましく、90~140g/eqであることがより好ましい。
(式中、
R1及びR2は、各々独立に、水素原子、炭素数1~12のアルキル基又はフェニル基からなる群より選択され、
R3、R4、R5及びR6は、各々独立に、メルカプトメチル基、メルカプトエチル基及びメルカプトプロピル基からなる群より選択される)
で表される化合物である。式(1)で表される化合物の例には、1,3,4,6-テトラキス(2-メルカプトエチル)グリコールウリル(商品名:TS-G、四国化成工業株式会社製)、(1,3,4,6-テトラキス(3-メルカプトプロピル)グリコールウリル(商品名:C3 TS-G、四国化成工業株式会社製)、1,3,4,6-テトラキス(メルカプトメチル)グリコールウリル、1,3,4,6-テトラキス(メルカプトメチル)-3a-メチルグリコールウリル、1,3,4,6-テトラキス(2-メルカプトエチル)-3a-メチルグリコールウリル、1,3,4,6-テトラキス(3-メルカプトプロピル)-3a-メチルグリコールウリル、1,3,4,6-テトラキス(メルカプトメチル)-3a,6a-ジメチルグリコールウリル、1,3,4,6-テトラキス(2-メルカプトエチル)-3a,6a-ジメチルグリコールウリル、1,3,4,6-テトラキス(3-メルカプトプロピル)-3a,6a-ジメチルグリコールウリル、1,3,4,6-テトラキス(メルカプトメチル)-3a,6a-ジフェニルグリコールウリル、1,3,4,6-テトラキス(2-メルカプトエチル)-3a,6a-ジフェニルグリコールウリル、1,3,4,6-テトラキス(3-メルカプトプロピル)-3a,6a-ジフェニルグリコールウリル等が含まれる。これらは、それぞれ単独で用いることも、また二種以上を混合して用いても良い。これらのうち、1,3,4,6-テトラキス(2-メルカプトエチル)グリコールウリル及び1,3,4,6-テトラキス(3-メルカプトプロピル)グリコールウリルが特に好ましい。
(R8)m-A-(R7-SH)n (2)
(式中、
Aは、n+m個の水酸基を有する多価アルコールの残基であって、前記水酸基に由来するn+m個の酸素原子を含み、
各々のR7は独立に、炭素数1~10のアルキレン基であり、
各々のR8は独立に、水素原子又は炭素数1~10のアルキル基であり、
mは、0以上の整数であり、
nは、3以上の整数であり、
前記R7及びR8は各々、前記酸素原子の一つを介して前記Aと結合している)
で表される化合物である。式(2)で表される化合物を2種以上組み合わせて用いてもよい。式(2)で表される化合物の例には、ペンタエリスリトールトリプロパンチオール(商品名:Multhiol Y-3、SC有機化学株式会社製)、ペンタエリスリトールテトラプロパンチオール等が含まれる。これらのうち、ペンタエリスリトールトリプロパンチオールが特に好ましい。
これらの多官能チオール化合物は、単独で用いてもよく、2種以上を組み合わせて用いてもよい。
本発明の硬化性樹脂組成物は、(メタ)アクリレート基を有する化合物、すなわち、1個以上のヒドロキシル基を有する化合物1分子が、1分子以上の(メタ)アクリル酸でエステル化された構造(エステル化されていないヒドロキシル基があってもよい)を有する化合物を少なくとも1種含む。ただし、(メタ)アクリレート基を有するシランカップリング剤は、(メタ)アクリレート基を有する化合物に含まれない。好ましくは、(メタ)アクリレート基を有する化合物は、ケイ素原子を含まない。本発明において用いられる(メタ)アクリレート基を有する化合物は、(メタ)アクリレート基を1つだけ有する化合物、すなわち単官能(メタ)アクリレート化合物を含んでいてもよいが、(メタ)アクリレート基を2つ以上有する化合物、すなわち多官能(メタ)アクリレート化合物を含むことが好ましい。本発明の一実施形態においては、(メタ)アクリレート基を有する化合物は、多官能(メタ)アクリレート化合物を含む。多官能(メタ)アクリレート化合物は、2~4官能であることが好ましく、2官能であることがより好ましい。1分子中の(メタ)アクリレート基の数が多くなりすぎると、UV照射による仮硬化時に架橋密度が高くなりすぎ、その後の熱による硬化時に、仮硬化物が変形しにくくなり、フレアの抑制が十分とならない可能性がある。硬化性樹脂組成物の低粘度化の観点から、(メタ)アクリレート基を有する化合物の分子量は、100~5000であることが好ましく、200~3000であることがより好ましい。
(メタ)アクリレート基を有する化合物は、上記の構造的要件を満たしている限り、(メタ)アクリロイルオキシ基の形態でない(メタ)アクリロイル基を含んでいてもよい。
-ビスフェノールA(又はそのPEG化物)のジ(メタ)アクリレート;
-ジメチロールトリシクロデカンのジ(メタ)アクリレート;
-トリス(2-ヒドロキシエチル)イソシアヌレートのジ(メタ)アクリレート;
-トリス(2-ヒドロキシエチル)イソシアヌレートのトリ(メタ)アクリレート;
-トリメチロールプロパンのトリ(メタ)アクリレート、又はそのオリゴマー;
-ジトリメチロールプロパンのポリ(メタ)アクリレート;
-ペンタエリスリトールのトリ(メタ)アクリレート、又はそのオリゴマー;
-ジペンタエリスリトールのポリ(メタ)アクリレート
-ポリエステルアクリレート(多官能)
等を挙げることができる。
-トリス(アクリロキシエチル)イソシアヌレートのポリ(メタ)アクリレート;
-カプロラクトン変性トリス(アクリロキシエチル)イソシアヌレートのポリ(メタ)アクリレート;
-カプロラクトン変性トリス(メタクリロキシエチル)イソシアヌレートのポリ(メタ)アクリレート;
-アルキル変性ジペンタエリスリトールのポリ(メタ)アクリレート;
-カプロラクトン変性ジペンタエリスリトールのポリ(メタ)アクリレート
等を挙げることができる。
市販されている(メタ)アクリレート基を有する化合物の例としては、東亜合成株式会社製ポリエステルアクリレート(商品名:アロニックスM-7100)、共栄社化学株式会社製ジメチロール-トリシクロデカンジアクリレート(商品名:ライトアクリレートDCP-A)、ダイセル・オルネクス株式会社製ポリエステルアクリレート(商品名:EBECRYL810)等を挙げることができる。
これらの(メタ)アクリレート基を有する化合物は、単独で用いてもよく、2種以上を組み合わせて用いてもよい。
本発明の硬化性樹脂組成物は、前記多官能チオール化合物(より正確には、その中のチオール基)と反応しうる官能基を有し、(メタ)アクリレート基を有しない、熱硬化性樹脂を含む。以下、チオール基と反応しうる官能基(ただし、(メタ)アクリレート基を除く)を「反応性官能基」と称することがある。反応性官能基には、エポキシ基の他、マレイミド基等の二重結合を有する官能基が含まれるが、本発明においては、反応性官能基がエポキシ基であることが好ましい。本発明の一実施形態において、熱硬化性樹脂は、エポキシ樹脂又はマレイミド樹脂、好ましくはエポキシ樹脂を含む。
エポキシ樹脂は、単官能エポキシ樹脂と多官能エポキシ樹脂に大別される。本発明において、エポキシ樹脂は、多官能エポキシ樹脂を含むことが好ましい。本発明のある態様においては、エポキシ樹脂は、多官能エポキシ樹脂及び単官能エポキシ樹脂を含む。
-(ポリ)エチレングリコールジグリシジルエーテル、(ポリ)プロピレングリコールジグリシジルエーテル、ブタンジオールジグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、1,6-ヘキサンジオールジグリシジルエーテル、トリメチロールプロパンジグリシジルエーテル、ポリテトラメチレンエーテルグリコールジグリシジルエーテル、グリセリンジグリシジルエーテル、ネオペンチルグリコールジグリシジルエーテル、1,2-エポキシ-4-(2-メチルオキシラニル)-1-メチルシクロヘキサン、シクロヘキサン型ジグリシジルエーテル、ジシクロペンタジエン型ジグリシジルエーテルのようなジエポキシ樹脂;
-トリメチロールプロパントリグリシジルエーテル、グリセリントリグリシジルエーテルのようなトリエポキシ樹脂;
-ビニル(3,4-シクロヘキセン)ジオキシド、2-(3,4-エポキシシクロヘキシル)-5,1-スピロ-(3,4-エポキシシクロヘキシル)-m-ジオキサンのような脂環式エポキシ樹脂;
-テトラグリシジルビス(アミノメチル)シクロヘキサンのようなグリシジルアミン型エポキシ樹脂;
-1,3-ジグリシジル-5-メチル-5-エチルヒダントインのようなヒダントイン型エポキシ樹脂;及び
-1,3-ビス(3-グリシドキシプロピル)-1,1,3,3-テトラメチルジシロキサンのようなシリコーン骨格を有するエポキシ樹脂
などが挙げられるが、これらに限定されない。これらは単独で用いてもよく、2種以上を組み合わせて用いてもよい。
-ビスフェノールA型エポキシ樹脂;
-p-グリシジルオキシフェニルジメチルトリスビスフェノールAジグリシジルエーテルのような分岐状多官能ビスフェノールA型エポキシ樹脂;
-ビスフェノールF型エポキシ樹脂;
-ノボラック型エポキシ樹脂;
-テトラブロモビスフェノールA型エポキシ樹脂;
-フルオレン型エポキシ樹脂;
-ビフェニルアラルキルエポキシ樹脂;
-1,4-フェニルジメタノールジグリシジルエーテルのようなジエポキシ樹脂;
-3,3',5,5'-テトラメチル-4,4'-ジグリシジルオキシビフェニルのようなビフェニル型エポキシ樹脂;
-ジグリシジルアニリン、ジグリシジルトルイジン、トリグリシジル-p-アミノフェノール、テトラグリシジル-m-キシリレンジアミンのようなグリシジルアミン型エポキシ樹脂;及び
-ナフタレン環含有エポキシ樹脂
などが挙げられるが、これらに限定されない。これらは単独で用いてもよく、2種以上を組み合わせて用いてもよい。
エポキシ樹脂のエポキシ当量は、90~500g/eqであることが好ましく、100~450g/eqであることがより好ましく、100~300g/eqであることがさらに好ましい。
なお、エポキシ基等の反応性官能基を有するシランカップリング剤は、熱硬化性樹脂に含まれない。好ましくは、熱硬化性樹脂は、ケイ素原子を含まない。
本発明の硬化性樹脂組成物は、光ラジカル開始剤を含む。光ラジカル開始剤を用いることにより、本発明の硬化性樹脂組成物をUV照射で仮硬化させることが可能となる。本発明において使用可能な光ラジカル開始剤は、特に限定されず、公知のものを使用することが可能である。光ラジカル開始剤の例としては、1-ヒドロキシシクロヘキシルフェニルケトン、2-ヒドロキシ-2-メチル-1-フェニルプロパン-1-オン、ジエトキシアセトフェノン、1-(4-イソプロピルフェニル)-2-ヒドロキシ-2-メチルプロパン-1-オン、1-(4-ドデシルフェニル)-2-ヒドロキシ-2-メチルプロパン-1-オン、4-(2-ヒドロキシエトキシ)-フェニル(2-ヒドロキシ-2-プロピル)ケトン、2-メチル-1-[4-(メチルチオ)フェニル]-2-モルホリノプロパン-1-オン、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾインn-ブチルエーテル、ベンゾインフェニルエーテル、ベンジルジメチルケタール、ベンゾフェノン、ベンゾイル安息香酸、ベンゾイル安息香酸メチル、4-フェニルベンゾフェノン、ヒドロキシベンゾフェノン、アクリル化ベンゾフェノン、4-ベンゾイル-4'-メチルジフェニルサルファイド、3,3'-ジメチル-4-メトキシベンゾフェノン、チオキサントン、2-クロルチオキサントン、2-メチルチオキサントン、2,4-ジメチルチオキサントン、イソプロピルチオキサントン、2,4-ジクロロチオキサントン、2,4-ジエチルチオキサントン、2,4-ジイソプロピルチオキサントン、2,4,6-トリメチルベンゾイルジフェニルホスフインオキサイド、メチルフェニルグリオキシレート、ベンジル、カンファーキノン等を挙げることができる。これらは単独で用いてもよく、2種以上を組み合わせて用いてもよい。光ラジカル開始剤の量は、硬化性樹脂組成物の0.01~10質量%であることが好ましく、0.05~5質量%であることがより好ましく、0.1~3質量%であることがさらに好ましい。
[(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.20~0.65
で表される関係を満足する。上記比が、0.65を超えると、UV照射による仮硬化後の接着強度が十分とならない。また、上記比が、0.20未満であると、得られる硬化物の表面光沢が低減されない。
なお、目視において硬化物は表面光沢がないと判断される場合でも、光沢度計では光沢が検出されることがあり、光沢度計によって測定される鏡面光沢度が低いことがより望ましい。本発明においては、UV照射による仮硬化後の接着強度向上と得られる硬化物の鏡面光沢度低下の両立の観点から、これらの質量が、下記式:
[(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.30~0.60
で表される関係を満足することが好ましい。上記比は、0.40~0.60であることがより好ましい。
([前記(B)(メタ)アクリレート基を有する化合物に含まれる(メタ)アクリレート基の総数]+[前記(C)熱硬化性樹脂に含まれる、(A)多官能チオール化合物と反応しうる官能基の総数])/[前記(A)多官能チオール化合物に含まれるチオール基の総数]=0.5~1.5
であることが好ましい。この比は、より好ましくは0.6~1.4、さらに好ましくは0.8~1.2である。このような関係が満足されていることは、硬化反応後に未反応のまま硬化物中に残る(メタ)アクリレート基、反応性官能基及びチオール基が比較的少ないことを示す。硬化物中に残る未反応基が少ない場合、高温環境で使用した場合でも新たな架橋が形成されにくいため、硬化物の物性が安定する。
反応性官能基がエポキシ基以外の基である場合でも、反応性官能基の総数を求めることは、当業者にとって容易である。
本発明の硬化性樹脂組成物は、所望であれば、硬化触媒を含んでいてもよい。硬化触媒は、前記(C)熱硬化性樹脂を硬化させるために使用される。硬化触媒を用いることにより、本発明の硬化性樹脂組成物を低温条件下でも短時間で硬化させることができる。本発明の硬化性樹脂組成物が硬化触媒を含む場合、硬化触媒は、前記(C)熱硬化性樹脂を硬化させることができる硬化触媒であれば特に限定されず、公知のものを使用することができる。
本発明の硬化性樹脂組成物は、所望であれば、顔料を含んでいてもよい。顔料を含むことで、本発明の硬化性樹脂組成物の色度を調整することができる。本発明の硬化性樹脂組成物は、顔料を含むことで、カメラモジュール内のイメージセンサ(撮像素子)への、意図しない光の影響をさらに低減することが可能となる。顔料としては、特に限定されないが、例えば、黒色有機顔料、混色有機顔料、及び、カーボンブラック、チタンブラック、その他の無機顔料等を用いることができる。黒色有機顔料としては、ペリレンブラック、アニリンブラック等が、混色有機顔料としては、赤、青、緑、紫、黄色、マゼンダ、シアン等から選ばれる少なくとも2種類以上の顔料を混合して疑似黒色化されたものが、無機顔料としては、グラファイト、ならびに金属及びその酸化物(複合酸化物を含む)、硫化物、窒化物等の微粒子が挙げられる。この金属としては、チタン、銅、鉄、マンガン、コバルト、クロム、ニッケル、亜鉛、カルシウム、銀等が挙げられる。本発明の硬化性樹脂組成物において、顔料は、単独で用いてもよく、2種以上を併用してもよい。また顔料は、染料などの他の着色剤と組み合わせて用いてもよい。
本発明において、顔料は、黒色顔料を含むことが好ましく、チタンブラックを含むことがより好ましい。UVの透過性と隠ぺい性の両立の観点から、顔料の一次粒子の平均粒径は、20~200nmであることが好ましく、50~150nmであることがより好ましい。本明細書において、顔料の一次粒子の平均粒径は、特に断りのない限り、ISO-13320(2009)に準拠してレーザー回折法によって測定した、体積基準のメジアン径(d50)を指す。レーザー回折法による測定が困難である場合(例えば、測定対象がレーザー回折法を適用し難い微細粒子を含む場合)、測定対象の一次粒子の平均粒径を、他の測定方法によって測定してもよい。他の測定方法の例としては、走査型電子顕微鏡(SEM)での観察による測定、動的光散乱法、比表面積からの算出等を挙げることができる。本発明においては、そのような場合、測定対象の一次粒子の平均粒径を、SEM観察による測定から算出することが好ましい。
本発明の硬化性樹脂組成物は、所望であれば、フィラーを含んでいてもよい。本発明の硬化性樹脂組成物を一液型接着剤として使用する場合、これにフィラーを添加すると、接着した部位の耐湿性および耐サーマルサイクル性、特に耐サーマルサイクル性が向上する。フィラーの添加により耐サーマルサイクル性が向上するのは、硬化物の線膨張係数が減少する、即ちサーマルサイクルによる硬化物の膨張・収縮が抑制されるためである。
またフィラーは、表面処理剤、例えばシランカップリング剤(フェニル基、ビニル基、アクリロイル基、メタクリロイル基等の置換基を有していてもよい)等のカップリング剤で表面処理されていてもよい。本発明においては、フィラーの少なくとも一部が表面処理されていることが好ましい。
本発明に用いられるフィラーは、ディスペンサーでの吐出性の観点からは、球状であることが好ましい。
本発明の硬化性樹脂組成物は、所望であれば、安定剤を含んでいてもよい。安定剤は、本発明の硬化性樹脂組成物に、その貯蔵安定性を向上させ、ポットライフを長くするために添加することができる。一液型接着剤の安定剤として公知の種々の安定剤を使用することができるが、貯蔵安定性を向上させる効果の高さから、液状ホウ酸エステル化合物、アルミキレート及び有機酸からなる群から選択される少なくとも1つが好ましい。
本発明の硬化性樹脂組成物は、所望であれば、カップリング剤を含んでいてもよい。カップリング剤、特にシランカップリング剤の添加は、接着強度向上の観点から好ましい。シランカップリング剤は、無機材料と化学結合しうる官能基と、有機材料と化学結合しうる官能基を含む、2種以上の異なる官能基をその分子中に有する有機ケイ素化合物である。一般に、無機材料と化学結合しうる官能基は加水分解性シリル基であり、アルコキシ基、特にメトキシ基及び/又はエトキシ基を含むシリル基が、この官能基として用いられている。有機材料と化学結合しうる官能基としては、ビニル基、エポキシ基、(メタ)アクリル基、スチリル基、非置換又は置換アミノ基、メルカプト基、ウレイド基、イソシアネート基等が用いられている。カップリング剤としては、前記の官能基を有する各種シランカップリング剤を用いることができる。シランカップリング剤の具体例としては、3-グリシドキシプロピルトリメトキシシラン、3-アミノプロピルトリメトキシシラン、ビニルトリメトキシシラン、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、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、p-スチリルトリメトキシシラン、3-メタクリロキシプロピルメチルトリメトキシシラン、3-アクリロキシプロピルトリメトキシシラン、8-グリシドキシオクチルトリメトキシシラン、3-ウレイドプロピルトリエトキシシラン、3-メルカプトプロピルトリメトキシシラン、ビス(トリエトキシシリルプロピル)テトラスルフィド、3-イソシアネートプロピルトリエトキシシラン等が挙げられる。これらのシランカップリング剤は、単独で用いても、2種以上を併用してもよい。本発明において、シランカップリング剤(上記フィラーの表面処理に用いられるものを含む)は、(メタ)アクリロイル基や、エポキシ基等の反応性官能基を有していても、成分(A)~(D)に含まれない。
本発明の硬化性樹脂組成物は、所望であれば、揺変剤を含んでいてもよい。本発明において用いる揺変剤は特に限定されず、公知のものを使用することができる。本発明に用いられる揺変剤の例としては、シリカ、ベントナイト、炭酸カルシウム等が挙げられるが、これらに限定されない。本発明においては、揺変剤がシリカを含むことが好ましい。シリカは、天然シリカ(珪石、石英など)であってもよく、合成シリカであってもよい。合成シリカは、乾式法及び湿式法を含む任意の方法で合成されうる。
また揺変剤は、表面処理剤(例えば、ポリジメチルシロキサン)で表面処理されていてもよい。本発明においては、揺変剤の少なくとも一部が表面処理されていることが好ましい。揺変剤の一次粒子の平均粒径は5~50nmであることが好ましい。
本発明の硬化性樹脂組成物は、所望であれば、本発明の趣旨を損なわない範囲で、その他の添加剤、例えばイオントラップ剤、レベリング剤、酸化防止剤、消泡剤、難燃剤、溶剤等を含んでいてもよい。各添加剤の種類、添加量は常法通りである。
・紫外線(UV)照射による仮硬化処理、及び
・加熱による本硬化処理
を含む2段階の硬化処理に付すことによって、最終の硬化物に変換することができる。
このため、本発明の硬化性樹脂組成物を用いてその部品が接合された組み立て物では、光の鏡面反射に起因する問題が解決される。例えば、本発明の硬化性樹脂組成物を用いて製造されたカメラモジュールでは、撮像時のフレアが大幅に抑制される。
例えば、本発明の硬化性樹脂組成物は、カメラモジュールの製造において、図1に示すように、ホルダ70と基板20との接着に使用することができる。また、本発明の硬化性樹脂組成物は、レンズバレル60とホルダ70の接着に使用することができる。また、本発明の硬化性樹脂組成物は、光学フィルタ50とホルダ70の接着に使用することができる。樹脂組成物の被接着面への供給には、エアーディスペンサー等を使用することができる。
また、本発明においては、本発明の硬化性樹脂組成物又は接着剤を硬化させることにより得られる硬化物も提供される。本発明においてはさらに、本発明の硬化物を含むカメラモジュールも提供される。
表1に示す配合に従って、3本ロールミルを用いて所定の量の各成分を混合することにより、硬化性樹脂組成物を調製した。表1において、各成分の量は質量部(単位:g)で表されている。
実施例及び比較例において、(A)多官能チオール化合物として用いた化合物は、以下の通りである。
(A-1):ペンタエリスリトールテトラキス(3-メルカプトプロピオネート)(商品名:PEMP、SC有機化学株式会社製、チオール当量:122)
(A-2):ペンタエリスリトールトリプロパンチオール(商品名:Multhiol Y-3、SC有機化学株式会社製、チオール当量:140)
実施例及び比較例において、(B)(メタ)アクリレート基を有する化合物として用いた化合物は、以下の通りである。
(B-1):多官能アクリレート化合物1(商品名:アロニックスM-7100、東亞合成株式会社製、(メタ)アクリレート当量:188)
(B-2):多官能アクリレート化合物2(商品名:ライトアクリレートDCP-A、共栄社化学株式会社製、(メタ)アクリレート当量:152)
実施例及び比較例において、(C)熱硬化性樹脂として用いた化合物は、以下の通りである。
(C-1):ビスフェノールF型エポキシ樹脂・ビスフェノールA型エポキシ樹脂混合物(商品名:EXA-835LV、DIC株式会社製、エポキシ当量:165)
(C-2):ビスフェノールA型エポキシ樹脂(商品名:jER834、三菱化学株式会社製、エポキシ当量:250)
実施例及び比較例において、(D)光ラジカル開始剤として用いた化合物は、以下の通りである。
(D-1)2-メチル-1-[4-(メチルチオ)フェニル]-2-モルホリノプロパン-1-オン(商品名:Omnirad 907、IGM Resins B.V.製)
実施例及び比較例において、(E)硬化触媒として用いた化合物は、以下の通りである。
(E-1)アミン-エポキシアダクト系潜在性硬化触媒(商品名:ノバキュアHXA9322HP、旭化成株式会社製)
(E-2)イミダゾール系潜在性硬化触媒(商品名:フジキュアーFXR1121、株式会社T&K TOKA製)
実施例及び比較例において、(F)顔料として用いた化合物は、以下の通りである。
(F-1)チタンブラック(商品名:13M、三菱マテリアル電子化成株式会社製)
(F-2)カーボンブラック(商品名:ブラック4、オリオン・エンジニアドカーボンズ株式会社製)
実施例及び比較例において、(G)フィラーとして用いた化合物は、以下の通りである。
(G-1)球状シリカ(商品名:SE5200SEE、株式会社アドマテックス製、平均粒径:2μm)
(G-2)炭酸カルシウム(商品名:CS4NA、宇部マテリアルズ株式会社製、平均粒径:<0.5μm)
25mm×75mm×1.5mmのガラス平板に、孔版印刷により、硬化性樹脂組成物を15mm×50mm(厚さ0.3mm)の矩形となるように印刷した。印刷した硬化性樹脂組成物を、エクセリタス・テクノロジーズ社製UV LED照射装置AC475を用いて、積算光量2000mJ/cm2(ウシオ電機株式会社製UIT-250(受光機UVD-365を接続)にて測定)で、UV照射により仮硬化させた。次いで、仮硬化させた硬化性樹脂組成物を、送風乾燥機中80℃で60分間本硬化させ、得られたガラス板上の硬化物を試験片として用いた。
室内蛍光灯(32W×2本)下1mの位置に置いた試験片を、ガラス板表面からおよそ30°の角度にて目視観察することにより、試験片の表面の光沢の有無を評価した。結果を表1に示す。
上記「硬化物の表面の光沢の有無の評価」において使用されたものと同じ試験片の表面の鏡面光沢度(%)を、株式会社堀場製作所製グロスチェッカーIG-331(光源:LED(波長890nm))を用いて、JIS Z 8741の規定に従い、入射角60°、受光角60°の条件下で測定した。結果を表1に示す。
3cm×4cm×0.3mmのステンレス鋼(SUS304)板上に、孔版印刷により、硬化性樹脂組成物を2mmφの円形となるように印刷した。印刷後の組成物は、2mmφで、厚さ0.13mmであった。印刷した硬化性樹脂組成物上に、各々1.5mm×3mm×0.5mmのアルミナチップを乗せた。硬化性樹脂組成物を、エクセリタス・テクノロジーズ社製UV LED照射装置AC475を用いて、積算光量2000mJ/cm2(ウシオ電機株式会社製UIT-250(受光機UVD-365を接続)にて測定)で、UV照射により仮硬化させることにより、アルミナチップをステンレス鋼板に接着した。各接着部位について、卓上万能試験機(アイコーエンジニアリング株式会社製1605HTP)を用いてシェア強度(単位:N)を測定した。各組成物のシェア強度は、複数(n=10)の測定値の平均である。結果を表1に示す。
UV照射での仮硬化による接着強度は、2.5N以上であることが好ましく、5N以上であることがより好ましい。
硬化性樹脂組成物として実施例4の硬化性樹脂組成物を用い、上記「硬化物の表面の光沢の有無の評価」に記載されているようにして得られた硬化物Aの外観を示す写真を、図2に示す。また、硬化性樹脂組成物として比較例1の硬化性樹脂組成物を用いる以外は上記と同様にして得られた硬化物Bの外観を示す写真を、図3に示す。
さらに、硬化物Aの表面の光学顕微鏡写真を図4に、硬化物Bの表面の光学顕微鏡写真を図5に示す。図4及び5はいずれも、対物レンズの倍率20倍で撮影され、その幅(横方向の長さ)が0.7mmに相当する。
また、実施例の硬化物A及び比較例の硬化物Bの表面を顕微鏡観察すると、いずれも表面は完全に平坦ではない。しかし、前者は後者に比して、有意に突起が際立った構造を有する。このため、実施例の硬化物は、鏡面光沢度が有意に低減されているのに対し、比較例の硬化物は、鏡面光沢度が十分に低減されていないと考えられる。
10 接着剤の硬化物
20 基板
30 イメージセンサー
40 光学レンズ
50 光学フィルタ
60 レンズバレル
70 ホルダ
Claims (14)
- 下記(A)~(D):
(A)多官能チオール化合物
(B)(メタ)アクリレート基を有する化合物
(C)前記(A)多官能チオール化合物と反応しうる官能基を有し、(メタ)アクリレート基を有しない、熱硬化性樹脂
(D)光ラジカル開始剤
を含み、
[(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.20~0.65である、
硬化性樹脂組成物。 - [(C)熱硬化性樹脂の質量]/([(B)(メタ)アクリレート基を有する化合物の質量]+[(C)熱硬化性樹脂の質量])=0.30~0.60である、請求項1記載の硬化性樹脂組成物。
- ([(B)(メタ)アクリレート基を有する化合物に含まれる(メタ)アクリレート基の総数]+[(C)熱硬化性樹脂に含まれる、(A)多官能チオール化合物と反応しうる官能基の総数])/[(A)多官能チオール化合物に含まれるチオール基の総数]=0.5~1.5である、請求項1又は2記載の硬化性樹脂組成物。
- (B)(メタ)アクリレート基を有する化合物が多官能アクリレート化合物を含む、請求項1~3いずれか一項記載の硬化性樹脂組成物。
- (C)熱硬化性樹脂がエポキシ樹脂を含む、請求項1~4のいずれか一項記載の硬化性樹脂組成物。
- (E)硬化触媒を更に含む、請求項1~5のいずれか一項記載の硬化性樹脂組成物。
- (F)顔料を更に含む、請求項1~6のいずれか一項記載の硬化性樹脂組成物。
- (F)顔料が黒色顔料を含む、請求項7記載の硬化性樹脂組成物。
- (G)フィラーを更に含む、請求項1~8のいずれか一項記載の硬化性樹脂組成物。
- JIS Z 8741の規定に従い、入射角60°で測定した鏡面光沢度が15%以下である硬化物を与える、請求項1~9のいずれか一項記載の硬化性樹脂組成物。
- カメラモジュールにおいて、ホルダを基板へ接着するため、レンズバレルをホルダに接着するため、又は、光学フィルタをホルダに接着するための、請求項1~10のいずれか一項記載の硬化性樹脂組成物。
- 請求項1~11のいずれか1項記載の硬化性樹脂組成物を含む、接着剤。
- 請求項1~11のいずれか1項記載の硬化性樹脂組成物、又は請求項12に記載の接着剤の硬化物。
- 請求項13記載の硬化物を含む、カメラモジュール。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22780475.4A EP4317234A1 (en) | 2021-03-30 | 2022-03-24 | Curable resin composition |
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JP2023511122A JPWO2022210261A1 (ja) | 2021-03-30 | 2022-03-24 | |
CN202280017390.6A CN116888219A (zh) | 2021-03-30 | 2022-03-24 | 固化性树脂组合物 |
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Cited By (4)
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WO2023090317A1 (ja) * | 2021-11-19 | 2023-05-25 | ナミックス株式会社 | 硬化性樹脂組成物 |
WO2024089905A1 (en) * | 2022-10-28 | 2024-05-02 | Namics Corporation | Resin composition, adhesive, sealant, cured product, semiconductor device and electronic component |
WO2024090259A1 (ja) * | 2022-10-28 | 2024-05-02 | ナミックス株式会社 | 樹脂組成物、接着剤、封止材、硬化物、半導体装置及び電子部品 |
WO2024089906A1 (en) * | 2022-10-28 | 2024-05-02 | Namics Corporation | Resin composition, adhesive, sealant, cured product and semiconductor device |
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KR20230162003A (ko) | 2023-11-28 |
CN116888219A (zh) | 2023-10-13 |
EP4317234A1 (en) | 2024-02-07 |
TW202307053A (zh) | 2023-02-16 |
JPWO2022210261A1 (ja) | 2022-10-06 |
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