WO2014069027A1 - 光硬化性シーリング用材料、シーリング方法、シーリング材およびそれを用いる筐体 - Google Patents
光硬化性シーリング用材料、シーリング方法、シーリング材およびそれを用いる筐体 Download PDFInfo
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- WO2014069027A1 WO2014069027A1 PCT/JP2013/064698 JP2013064698W WO2014069027A1 WO 2014069027 A1 WO2014069027 A1 WO 2014069027A1 JP 2013064698 W JP2013064698 W JP 2013064698W WO 2014069027 A1 WO2014069027 A1 WO 2014069027A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2003/1034—Materials or components characterised by specific properties
- C09K2003/1062—UV-curable materials
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
- C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
- C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C09K2200/0625—Polyacrylic esters or derivatives thereof
Definitions
- the present invention relates to a photocurable sealing material, a sealing method, a sealing material, and a casing using the same. More particularly, the present invention relates to a photocurable sealing material that is easily and instantaneously cured to a deep part by ultraviolet rays or the like.
- sealing materials include, for example, hot-melt adhesives, one-component urethane-based reactive hot-melt adhesives, thermoplastic hot-melt sealing materials, moisture-curable hot-melt sealing materials, thermosetting sealing materials, and molded rubber sealing Materials (gaskets), two-component urethane foam sealants, and the like are known.
- problems such as inadequate heat resistance and waterproofing, poor operability such as prevention of moisture contamination, heat damage to equipment for heating, housing, bad operability due to manufacturing using molds, etc.
- a flexible general-purpose resin is used for a housing of an electronic product, a home appliance, a precision instrument, etc., a sufficiently satisfactory performance cannot be exhibited.
- the photo-curable sealing material is superior in operability compared to conventional sealing materials because the sealing material can be created on the housing without using a mold.
- the photocurable sealing material there are mainly a photocurable sealing material using radical polymerization of an acryloyl group and an ene-thiol photocurable sealing material using an ene-thiol reaction.
- the photocurable sealing material using radical polymerization of an acryloyl group is described in, for example, Patent Documents 1 and 2, and includes a composition comprising a urethane acrylate oligomer, an acrylate monomer, and a photopolymerization initiator (and a photosensitizer). It is generated by curing with light or the like.
- the photocurable sealing materials of Patent Documents 1 and 2 do not have sufficient flexibility and tensile strength required for housings such as electronic products, home appliances, and precision devices.
- Patent Document 3 discloses a photocurable resin composition containing a compound having a polyene, a polythiol, and a bromine-substituted aromatic ring, and the cured product of this composition has a high refractive index and is bonded. It describes that it is excellent in strength and surface curability, and the refractive index can be adjusted with high accuracy.
- Patent Document 4 discloses an ene-thiol photocurable resin composition containing a polyene compound and a (poly) thiol monomer composed of a polymercaptocarboxylic acid amide compound.
- Patent Document 5 discloses a curable composition containing a thiol compound containing two or more groups having a specific structure and an urethane compound containing an ethylenically unsaturated double bond having a specific structure. It is described that the product has high adhesion to the substrate, reactivity, and transparency, and high heat resistance and hardness.
- Patent Document 6 discloses a photocurable resin composition that contains a polybutadiene (meth) acrylate, a polythiol compound, and a photoradical initiator and is cured by irradiation with an ultraviolet LED, and the composition is rapidly cured. It is described that it has excellent surface curability, moisture resistance and airtightness.
- Patent Documents 3 to 6 mentions flexibility, tensile strength, and the like required for casings of electronic products, home appliances, precision devices, and the like.
- Patent Documents 7 and 8 describe photocurable sealing materials that simultaneously and competitively carry out radical polymerization reaction of acryloyl group and ene-thiol reaction.
- Patent Documents 7 and 8 include (A) an oligomer having a (meth) acryloyl group, (B) a (meth) acrylate monomer, and (C) a polythiol compound, and the functional group ratio between the acryloyl group and the mercapto group is 100. : 0.1 to 100: 5n (where n is the number of mercapto groups in one molecule of the polythiol compound). It is described that this gasket material can improve elongation at break and suppress the occurrence of cracks and cracks.
- the polythiol compounds specifically used in the examples of Patent Document 7 are compounds having primary thiols, but the cured material for gaskets obtained in the examples are all flexible, elongation at break (Strength) or compression / recovery rate is insufficient, and in the examples, those that satisfy all the functions that can be used for casings of electronic products, home appliances, precision equipment, etc. are found. I can't.
- the sealing material described in Table 2 of Patent Document 7 production of the energy ray curable oligomer A (trade name “Lighttack PUA-KH32M”, manufactured by Kyoeisha Chemical Co., Ltd.), which was a raw material, was discontinued. It was. Therefore, when the oligomer and the monomer included were appropriately mixed and retested, as described in the comparative example of the present specification, only an extremely hard sealing material having a hardness of 50 or more was obtained. It was inappropriate.
- the problem to be solved by the present invention has a high compression recovery rate, a high tensile strength, an excellent elongation rate, and a low hardness as required, thereby providing excellent sealing properties such as airtightness and waterproofness, Is to provide a sealing material with less surface tack.
- Another object of the present invention is to provide a photocurable sealing material which is easily and instantly cured to the deep part of the photocurable sealing material to produce the same sealing material and has good storage stability until use.
- the present inventors have (A) an oligomer having a (meth) acryloyl group having a weight average molecular weight of 10,000 to 30,000, and (B) a (meth) acrylate monomer. And (C) when photocuring a photocurable sealing material containing a polythiol compound in a specific ratio, surprisingly, the tensile strength (elongation at break) is much higher than those described in any of the patent documents.
- the present invention was completed by finding that it has a high compression recovery rate at the same time. That is, the present invention is as follows.
- a photocurable sealing comprising (A) an oligomer having a (meth) acryloyl group having a weight average molecular weight of 10,000 to 30,000, (B) a (meth) acrylate monomer, and (C) a polythiol compound.
- a photocurable sealing material comprising a (meth) acryloyl group contained in both an oligomer having a (meth) acryloyl group and a (B) (meth) acrylate monomer and a mercapto group of (C) a polythiol compound.
- the ratio of the number present is from 100: 5n to 100: 25n (n is the number of mercapto groups in one molecule of the polythiol compound).
- Oligomers having (meth) acryloyl groups are urethane (meth) acrylate oligomers, polyester (meth) acrylate oligomers, polyether (meth) acrylate oligomers, epoxy (meth) acrylate oligomers, conjugated
- a stabilizer for an ene-thiol-based photocurable resin material containing a carbodiimide compound [11] A stabilizer for an ene-thiol-based photocurable resin material containing a carbodiimide compound.
- the photo-curing sealing material of the present invention has a high compression recovery rate, high tensile strength and excellent flexibility, and thereby has excellent sealing properties such as airtightness and waterproofness, and also has a low surface tack. Material is provided.
- the photocurable sealing material of the present invention can be easily and instantaneously cured to the depth of the photocurable sealing material to produce the same sealing material, and has good storage stability until use. Have.
- the photocurable sealing material of the present invention will be described sequentially.
- the oligomer (A) having a (meth) acryloyl group having a weight average molecular weight of 10,000 to 30,000 has a weight average molecular weight of 10,000 to 30,000, preferably a weight average
- An oligomer having a molecular weight of 12,000 to 25,000 is exemplified, and an oligomer having a weight average molecular weight of 15,000 to 22,000 is more preferred.
- the oligomer (A) is preferably an oligomer having at least two (meth) acrylate groups in the molecule, and the number of (meth) acrylate groups in one molecule of the oligomer (A) is, for example, 2 -10, preferably 2-6, more preferably 2-4, and particularly preferably 2.
- oligomer of (A) for example, urethane (meth) acrylate oligomer, polyester (meth) acrylate oligomer, polyether (meth) acrylate oligomer, acrylic (meth) acrylate oligomer, epoxy (meth) acrylate oligomer, Examples thereof include silicone (meth) acrylates such as conjugated diene polymer (meth) acrylate oligomers such as polybutadiene oligomers and hydrogenated products thereof.
- urethane-based (meth) acrylate oligomer for example, a polyol such as polyether polyol, polyester polyol, and carbonate diol is reacted with a polyisocyanate to obtain a polyurethane oligomer, and the oligomer is esterified with (meth) acrylic acid.
- the oligomer obtained by converting is mentioned.
- polyester-based (meth) acrylate oligomer for example, a polyester oligomer having hydroxyl groups at both ends is obtained by condensing a polyvalent carboxylic acid and a polyhydric alcohol or by adding a polyvalent carboxylic acid alkylene oxide. And an oligomer obtained by esterifying the hydroxyl group with (meth) acrylic acid.
- polyether-based (meth) acrylate oligomer examples include an oligomer obtained by esterifying a hydroxyl group of a polyether polyol with (meth) acrylic acid.
- acrylic (meth) acrylate oligomers examples include telechelic polyacrylates whose structure is highly controlled by application of an atom transfer radical polymerization (ATRP) method.
- ATRP atom transfer radical polymerization
- Examples of the epoxy-based (meth) acrylate oligomer include oligomers obtained by esterification by reacting (meth) acrylic acid with the oxirane ring of a relatively low molecular weight bisphenol-type epoxy resin and novolac-type epoxy resin.
- a carboxyl-modified epoxy acrylate oligomer obtained by partially modifying the epoxy-based (meth) acrylate oligomer with a dicarboxylic acid anhydride is also included.
- conjugated diene polymer (meth) acrylate oligomer examples include SBR diacrylate obtained by esterifying a liquid styrene-butadiene copolymer with acrylic acid, polyisoprene acrylate obtained by esterifying polyisoprene with acrylic acid, Examples thereof include polybutadiene acrylate obtained by esterification of polybutadiene with acrylic acid, polybutadiene acrylate obtained by reacting (meth) acrylate having an isocyanate group with 1,2-polybutadiene having a hydroxyl group at the molecular end.
- silicone (meth) acrylate examples include an ester compound of a hydroxyl group of an alcoholic siloxane compound and acrylic acid.
- the oligomer (A) may be used alone or in combination of two or more.
- Preferred oligomers (A) include urethane (meth) acrylate oligomers, and examples include urethane polyester (meth) acrylate oligomers.
- polyether diol, polyester diol and carbonate diol having two hydroxyl groups used in the production thereof include the following.
- polyether diol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyhexamethylene glycol and 1,3-butylene glycol, 1,4-butylene glycol, neopentyl glycol, cyclohexanedimethanol, 2,2- Examples thereof include polyether diols in which ethylene oxide or propylene oxide is added to bis (4-hydroxycyclohexyl) propane, bisphenol A, or the like.
- polyester diol examples include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol. 2,2-bis (4-hydroxycyclohexyl) propane, bisphenol A, etc. added with ethylene oxide or propylene oxide, alcohol added with ⁇ -caprolactone, adipic acid, sebacic acid, azelaic acid, dodecanedicarboxylic acid, etc. And polyester diols obtained by reacting with dicarboxylic acids or anhydrides.
- Examples of the carbonate diol include diaryl carbonates such as diphenyl carbonate, bis-chlorophenyl carbonate, dinaphthyl carbonate, phenyl-toluyl carbonate, phenyl-chlorophenyl carbonate, 2-tolyl-4-tolyl carbonate, dimethyl carbonate, and diethyl carbonate.
- (B) (Meth) acrylate monomer includes (meth) acrylate monomer having at least one (meth) acryloyl group in the molecule. Specifically, (meth) acryloyl group is 1 And monofunctional monomers having two, bifunctional monomers having three, trifunctional monomers having three, tetrafunctional monomers having four, and the like.
- Examples of the monofunctional monomer include methyl methacrylate, butyl methacrylate, 2-phenoxyethyl acrylate, ethoxylated 2-phenoxyethyl acrylate, 2- (2-ethoxyethoxy) ethyl acrylate, cyclic trimethylolpropane, acrylic acid formal, ⁇ -carboxyethyl acrylate, lauryl methacrylate, isooctyl acrylate, stearyl methacrylate, isodecyl acrylate, isobornyl methacrylate, benzyl acrylate, hydroxypivalyl hydroxypivalate diacrylate, ethoxylated 1,6-hexanediol diacrylate, Dipropylene glycol diacrylate, tricyclodecane dimethanol diacrylate, ethoxylated dipropylene glycol dia Relate, neopentyl glycol diacrylate, propoxylated neopentyl
- bifunctional monomer examples include 1,6-hexanediol diacrylate, bisphenol A ethoxylated acrylate, polyethylene glycol diacrylate (200-600), tripropylene glycol diacrylate, neopentyl glycol propoxylate (2), ethoxylated (2) Neopentyl glycol diacrylate, dipropylene glycol diacrylate, trimethylolpropane ethoxylated (3) methyl ether diacrylate, and combinations of two or more thereof.
- trifunctional monomer examples include trimethylolpropane triacrylate, trimethylolpropane propoxylated (5-20) triacrylate, propoxylated (4) glycerol triacrylate, ethoxylated (3) trimethylolpropane triacrylate, propoxy And pentalysitol triacrylate, and combinations of two or more thereof.
- tetrafunctional monomer examples include ditrimethylolpropane tetraacrylate, dipentaerythritol mono-hydroxypentaacrylate, and combinations of two or more thereof.
- (Meth) acrylate monomers may be used alone or in combination of two or more.
- Preferred (meth) acrylate monomers include monofunctional monomers, and combinations of monofunctional monomers and bifunctional monomers are also preferred. More preferred is a monofunctional monomer.
- the amount of (meth) acrylate used is in the range of 5 to 100 parts by weight with respect to 100 parts by weight of the (A) (meth) acryloyl group-containing oligomer. By using an amount in this range, the viscosity reduction, flexibility, compression recovery rate, and tensile strength of the sealing agent of the present invention can be improved.
- Preferable amount of (meth) acrylate is 10 to 80 parts by weight, more preferably 40 to 70 parts by weight.
- the type and amount of (meth) acrylate monomer can be appropriately adjusted in order to obtain properties such as viscosity, flexibility, compression recovery rate, and tensile strength.
- polythiol compound examples include compounds having 2 to 10 mercapto groups in the molecule, preferably those having 2 to 6 mercapto groups in the molecule, and more preferably And those having 3 to 4 mercapto groups in the molecule.
- polythiol compound examples include those described in Patent Documents 3 to 8. These polythiol compounds will be specifically described below.
- polythiol compound for example, (A) A polythiol compound containing a hydrocarbon structure (aliphatic polythiols such as C 2-20 alkane polythiol, araliphatic polythiols such as xylylene dithiol, halogen atoms of halohydrin adducts of alcohols are substituted with mercapto groups. Polythiols, polythiol compounds consisting of hydrogen sulfide reaction products of polyepoxide compounds, etc.) (B) Formula (1)
- R 1 and R 2 independently represent a hydrogen atom or a C 1-10 alkyl group. m is 0, 1 or 2, and n is 0 or 1. )
- R 1 , R 2 , m and n are as defined above.
- the polythiol compound containing the ester structure shown by these is mentioned.
- a polythiol compound containing an ether structure and (c) a polythiol compound containing an ester structure are preferred, and (c) a polythiol compound containing an ester structure is more preferred.
- Examples of the polythiol compound containing a hydrocarbon structure include 2,5-hexanedithiol, 2,9-decanedithiol, 1,4-bis (1-mercaptoethyl) benzene, and the like.
- Examples of the polythiol compound having an ether structure include a 2-mercaptoethyl ether group, a 2-mercaptopropyl ether group, a 3-mercaptopropyl ether group, a 2-mercaptobutyl ether group, a 3-mercaptobutyl ether group, and a 4-mercapto group.
- Examples thereof include compounds having a structure such as a butyl ether group, a 5-mercaptopentyl ether group, and a 5-mercaptohexyl ether group.
- the polythiol compound containing an ester structure is produced by esterifying a mercapto group-containing carboxylic acid and a polyhydric alcohol, which is a compound having a hydrogen atom bonded to the left end of the structure of the formula (2). Compounds are included.
- mercapto group-containing carboxylic acid which is a compound having a hydrogen atom bonded to the left end of the structure of the formula (2)
- examples of the mercapto group-containing carboxylic acid include thioglycolic acid, 2-mercaptopropionic acid, 3-mercaptobutyric acid, 2-mercaptoisobutyric acid
- Examples include 3-mercaptoisobutyric acid, 3-mercaptopropionic acid, 3-mercapto-3-phenylpropionic acid, 3-mercapto-3-methylbutyric acid, etc., preferably 3-mercaptobutyric acid, 3-mercapto-3-phenylpropion An acid, 3-mercapto-3-methylbutyric acid, etc. are mentioned, More preferably, 3-mercaptobutyric acid is mentioned.
- polyhydric alcohol examples include C 2-20 alkylene glycol (C 2-10 alkylene group is preferred, and the carbon chain thereof may be branched.
- examples thereof include ethylene glycol, trimethylene glycol, 1 , 2-propylene glycol, 1,2-butanediol, 1,3-butanediol, 2,3-butanediol, tetramethylene glycol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octane Diol, 1,9-nonanediol, 1,12-dodecanediol, cyclohexane-1,4-dimethanol, hydrogenated bisphenol A, etc.), diethylene glycol, poly (oxyalkylene) glycol, glycerin, triethylene glycol , Polyethylene glycol, dipropylene glycol , Tripropylene glycol, polypropylene glycol, polytetramethylene ether glycol, trimethylo
- Preferred polyhydric alcohols include alkylene glycols having 2 alkylene main chains such as ethylene glycol, 1,2-propylene glycol, 1,2-butanediol, trimethylolpropane, polycarbonate diol, cyclohexanediol, cyclohexanedi Methanol, 1,5-pentanediol, and the like.
- Examples of the polyol containing an aromatic ring include 2,2-bis [4- (2-hydroxyethyloxy) phenyl] propane, 4,4 ′-(9-fluorenylidene). ) Diphenol, 4,4 ′-(9-fluorenylidene) bis (2-phenoxyethanol), and the like.
- R 3 to R 6 independently represent a hydrogen atom or a C 1-10 alkyl group.
- L—C (O) —O— represents the structure represented by the formula (2).
- the polythiol compound shown by these is mentioned.
- the C 1-10 alkyl group of R 3 to R 6 in the formula (3) is preferably a linear or branched C 1-3 alkyl group, and specifically includes a methyl group, an ethyl group, and an n-propyl group. , An isopropyl group, and the like. Among them, a methyl group and an ethyl group are preferable.
- a polythiol compound in which R 3 is a hydrogen atom, a methyl group or an ethyl group, and R 4 to R 6 are all hydrogen atoms is particularly preferable.
- polythiol compounds include diphthalic acid di (1-mercaptoethyl ester), diphthalic acid di (2-mercaptopropyl ester), diphthalic acid di (3-mercaptobutyl ester), diphthalic acid di (3-mercaptoisobutyl).
- Ester ethylene glycol bis (3-mercaptobutyrate), propylene glycol bis (3-mercaptobutyrate), diethylene glycol bis (3-mercaptobutyrate), butanediol bis (3-mercaptobutyrate), octanediol bis ( 3-mercaptobutyrate), trimethylolpropane tris (3-mercaptobutyrate), pentaerythritol tetrakis (3-mercaptobutyrate), dipentaerythritol hexakis (3-mercaptobutyrate), 1 3-butanediol bis (3-mercaptobutyrate), 1,4-butanediol bis (3-mercaptobutyrate), neopentyl glycol bis (3-mercaptobutyrate), 1,6-hexanediol bis (3- Mercaptobutyrate), 1,8-octanediol bis (3-mercaptobutyrate), 1,9-nonan
- poly (3-mercaptobutyrate) isomers are preferred, particularly polyethylene glycol bis (3-mercaptobutyrate), pentaerythritol tetrakis (3-mercaptobutyrate), dipentaerythritol hexakis (3 -Mercaptobutyrate) and the like are preferable. Furthermore, the structure of the specific example of a preferable polythiol compound is shown below.
- Preferable polythiol compounds include compounds having a secondary mercapto group.
- the secondary thiol compound is superior in its storage stability to the primary thiol compound.
- the sealing material produced using the photocurable sealing material of the present invention has sealing properties superior to those of conventionally known photocurable sealing materials, but a polythiol compound having a secondary thiol is used.
- the coating stability during coating and the stability of sealing properties are excellent.
- excellent characteristics regarding hardness and flexibility can be stably obtained. The reason is presumably that the balance between the radical reaction and the heat addition reaction in the ene-thiol reaction is preferably adjusted by, for example, steric hindrance around the thiol group.
- the amount of polythiol compound used is (A) (meth) acryloyl group contained in both (A) (meth) acryloyl group-containing oligomer and (B) (meth) acrylate monomer, and (C) mercapto group of polythiol compound.
- the ratio of the number present in the photocurable sealing material is an amount that is 100: 5n to 100: 25n (where n is the number of mercapto groups in one molecule of the polythiol compound). The amount is such that the ratio is from 100: 7n to 100: 20n, more preferably the amount is such that the ratio is from 100: 9n to 100: 17n.
- the carbodiimide compound refers to a hydrolysis-resistant stabilizer (hydrolysis-resistant agent) that suppresses a hydrolysis chain by removing a hydroxyl group or a carboxyl group generated by hydrolysis of a resin such as polyester.
- Examples of the carbodiimide compound include a monocarbodiimide compound and a polycarbodiimide compound, which are widely known, and any of them can be used.
- Examples of the carbodiimide compound include JP-A-9-309871, JP-A-9-249801, JP-A-9-208649, JP-A-9-296097, JP-A-8-81533, JP-A-8-27092, JP-A-9-136869, and JP-A-9-136869. 9-124582, JP 9-188807, JP 2005-82642, JP 2005-53870, JP 2012-36392, JP 2010-163203, JP 2011-174094, WO 2008/072514, JP 2012-81759, Examples thereof include those described in JP 2012-52014, JP 2012-7079, and the like.
- R 11 may be substituted with an aliphatic and / or alicyclic substituent and / or an aromatic substituent having at least one carbon atom.
- these substituents may have a hetero atom, and these substituents may be substituted at at least one ortho position of the aromatic group to which the carbodiimide group is bonded.
- R 12 is C 1 -C 18 alkyl, C 5 -C 18 cycloalkyl, aryl, C 7 -C 18 aralkyl, -R 11 -NH-COS-R 14 , -R 11 COOR 14 , -R 11 -OR 14, -R 11 -N (R 14 ) 2, -R 11 -SR 14, -R 11 -OH, R 11 -NH 2, -R 11 -NHR 14, -R 11 - epoxy, -R 11 -NCO , -R 11 -NHCONHR 14 , -R 11 -NHCONR 14 R 15 or -R 11 -NHCOOR 16 .
- R 13 represents —N ⁇ C ⁇ N-aryl, —N ⁇ C ⁇ N-alkyl, —N ⁇ C ⁇ N-cycloalkyl, —N ⁇ C ⁇ N-aralkyl, —NCO, —NHCONHR 14 , —NHCONHR. 14 R 15 , —NHCOOR 16 , —NHCOS—R 14 , —COOR 14 , —OR 14 , epoxy, —N (R 14 ) 2 , —SR 14 , —OH, —NH 2 , —NHR 14 .
- R 14 and R 15 are the same or different and are C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 7 -C 18 aralkyl, oligo / polyethylene glycols and / or oligo / polypropylene glycol. It is kind.
- R 16 has one of the above definitions of R 14 or is a polyester group or a polyamide group.
- n 1-5.
- m is an integer greater than 5.
- Preferred carbodiimide compounds include aliphatic polycarbodiimide compounds having a plurality of —N ⁇ C ⁇ N—, and more preferred are linear aliphatic polymer compounds. Specific examples include aliphatic polycarbodiimide compounds (manufactured by Nisshinbo Chemical Co., Ltd .: Elasto Stub H01).
- the amount of the carbodiimide compound used is, for example, in the range of 0.1 to 15 parts by weight, preferably 0.5 to 12 parts by weight with respect to 100 parts by weight of the oligomer (A) having (meth) acryloyl groups. More preferred is 1 to 10 parts by weight.
- the above carbodiimide compound can also be used as a stabilizer for the ene-thiol-based photocurable resin material.
- the ene-thiol-based photocurable sealing material include conventionally known materials.
- a photo-curable resin material a photo-curable resin material.
- the amount of the carbodiimide compound added to the ene-thiol-based photocurable resin material is appropriately changed with reference to the amount used for the ene-thiol-based photocurable sealing material described in [1]. be able to.
- Photoradical polymerization initiator for example, an intramolecular cleavage type and / or a hydrogen abstraction type photoradical polymerization initiator can be used, and preferably an intramolecular cleavage type photoradical polymerization initiation is performed.
- Agents As the radical ultraviolet polymerization initiator, known ones can be suitably used.
- benzoins such as benzoin, benzoin methyl ether, and benzoin ethyl ether, and alkyl ethers thereof; acetophenone, 2, 2 -Acetophenones such as dimethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, 4- (1-t-butyldioxy-1-methylethyl) acetophenone, diethoxyacetophenone; 2-methylanthraquinone, 2-amylanthraquinone, 2 Anthraquinones such as t-butylanthraquinone and 1-chloroanthraquinone; thioxanthones such as 2,4-dimethylthioxanthone, 2,4-diisopropylthioxanthone and 2-chlorothioxanthone; acetophenone dimethyl Ketals such as tar and benzyldimethyl ketal; benzophenone,
- Benzophenones 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -1-butanone, etc.
- Phenyloxyalkylphenones phenylglyoxylates such as alkylphenylglyoxylate; diethoxyacetophenone; acylphosphine oxides such as 2,4,6-trimethylbenzoylphenylethoxyphosphine oxide; bis (5,2,4- Examples thereof include titanocene compounds such as cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium, and combinations of two or more thereof.
- Preferred radical photopolymerization initiators include intramolecular molecules such as bezoins, ketals, ⁇ -bidoxyalkylphenones, ⁇ -aminoalkylphenones, acylphosphine oxides, phenylglyoxylates, acetophenones, and titanocene compounds.
- a cleavage type photo radical initiator is mentioned.
- the addition amount of the radical photopolymerization initiator is not particularly limited, and for example, it is 0.1 to 10 parts by weight with respect to 100 parts by weight as the total weight of each component (A) to (C). Preferably, 0.2 to 5 parts by weight is mentioned, and more preferably 0.5 to 2 parts by weight.
- Viscosity modifier is not particularly limited, but white carbon, colloidal silica, silica sand (silica powder), aerosil, diatomaceous earth, hydrophobic calcium carbonate, glass balloon, glass beads, polyvinylpyrrolidone Etc. These viscosity modifiers may be used alone or in combination of two or more. Preferable viscosity modifiers include inorganic viscosity modifiers such as Aerosil.
- the addition amount of the viscosity modifier is not particularly limited, and examples thereof include 0.1 to 20 parts by weight with respect to 100 parts of the total weight of the components (A) to (C). 0.2 to 10 parts by weight is preferred.
- sensitizers Not only ultraviolet rays but also sensitizers can be added so that they can be cured by using visible light and near infrared rays.
- sensitizers include chalcone derivatives, unsaturated ketones such as dibenzalacetone, 1,2-diketone derivatives such as camphorquinone, benzoin derivatives, fluorene derivatives, naphthoquinone derivatives, anthraquinone derivatives, xanthene derivatives, thioxanthenes.
- xanthone derivatives thioxanthone derivatives, coumarin derivatives, ketocoumarin derivatives, cyanine derivatives, merocyanine derivatives, oxonol derivatives, and other polymethine dyes, acridine derivatives, azine derivatives, thiazine derivatives, oxazine derivatives, indoline derivatives, azulene derivatives, azurenium derivatives, Squarylium derivatives, porphyrin derivatives, tetraphenylporphyrin derivatives, triarylmethane derivatives, tetrabenzoporphyrin derivatives, tetrapyrazinoporphy Gin derivatives, phthalocyanine derivatives, tetraazaporphyrazine derivatives, tetraquinoxalyloporphyrazine derivatives, naphthalocyanine derivatives, subphthalocyanine derivatives, pyrylium derivatives, thiopyr
- the addition amount of the sensitizer is not particularly limited, and examples thereof include 0.1 to 10 parts by weight with respect to 100 parts by weight as the total weight of each component (A) to (C).
- the amount is preferably 0.2 to 5 parts by weight, and more preferably 0.5 to 2 parts by weight.
- Other components can be further added to the photocurable sealing material of the present invention.
- examples of other components include a sensitizer, a thickener, a polymerization inhibitor, a pigment, an adhesion improver, an antioxidant, a curing accelerator, a filler, a plasticizer, a surfactant, a lubricant, and an antistatic agent. Etc. An appropriate amount of these components can be added depending on the purpose.
- the photocurable sealing material of the present invention comprises (A) an oligomer having a (meth) acryloyl group having a weight average molecular weight of 10,000 to 30,000, and (B) (meth). Acrylate monomer, (C) polythiol compound, and (D) carbodiimide compound, (E) photo radical polymerization initiator, (F) sensitizer, (G) sensitizer, and / or other components as necessary It can be prepared by mixing using a mixer such as a mixer, a ball mill, or a three roll mill at room temperature or under heating conditions. Moreover, it can also adjust as needed by adding a solvent etc.
- diluent examples include esters such as ethyl acetate, butyl acetate and isopropyl acetate, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, cyclic ethers such as tetrahydrofuran and dioxane, N, N-dimethylformamide and the like. And amides, aromatic hydrocarbons such as toluene, and halogenated hydrocarbons such as methylene chloride.
- esters such as ethyl acetate, butyl acetate and isopropyl acetate
- ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone
- cyclic ethers such as tetrahydrofuran and dioxane, N, N-dimethylformamide and the like.
- the method of curing the photocurable sealing material of the present invention is not particularly limited, and can be carried out, for example, by irradiating energy rays.
- the energy rays used include light, radiation, electromagnetic waves, and the like, and specifically, ultraviolet rays, visible light, infrared rays, ⁇ rays, ⁇ rays, ⁇ rays, electron rays, and the like. From the viewpoint of operability, productivity and economy, it is preferable to use ultraviolet rays.
- the irradiation time of the energy beam can be appropriately selected depending on the type of energy beam used.
- the ultraviolet light source for example, a light source such as ultra-high pressure mercury, a metal halide light source, a laser, or an LED can be used.
- a light source such as ultra-high pressure mercury, a metal halide light source, a laser, or an LED
- curing can proceed quickly without the inclusion of a photo-radical polymerization initiator, but photo-radical polymerization is used when ultraviolet rays are used. It is preferred to add an initiator to the photocurable sealing material of the present invention.
- the casing of the present invention can be manufactured according to the following steps (1) to (4).
- a “casing” is a box containing a machine or electrical device having some function, which protects the device from impact, pressure, electromagnetic waves, water, dust, light, etc. means.
- electronic products such as a mobile phone, a digital camera, and a video camera, home appliances such as a refrigerator, an air conditioner, and a washing machine, precision devices such as a camera and a watch, and the like can be given.
- the sealing material of the present invention is used in a housing, it prevents water, pressure, dust and the like from being mixed, and does not impair the protective action of the housing as a whole.
- the sealing material of the present invention has a high compression recovery rate, high tensile strength, excellent flexibility, low hardness as required, and thereby excellent sealing characteristics such as airtightness and waterproofness, Furthermore, there is little surface tack.
- the hardness of the sealing material is preferably 40 or less, more preferably 30 or less, still more preferably 20 or less, and particularly preferably 15 or less in terms of a value measured with a type A durometer.
- the desired hardness can be adjusted. They are described in more detail in the examples.
- Test method (1) Tensile strength at break and elongation rate A sheet of a cured UV resin having a thickness of 1 mm was punched into a dumbbell No. 3 type according to JIS K 6251 to obtain a test piece. A tensile test was conducted under the conditions of a test temperature of 23 ° C. and a tensile speed of 100 m / min, and the tensile strength and elongation at break were measured.
- Compression recovery property A sheet of a cured UV resin cut to 25 mm square is laminated to a thickness of about 5 mm, and the specimen is compressed by 25% and 50%, respectively, and tested in accordance with JIS K 6253. The compression recovery property was measured at a temperature of 70 ° C.
- ⁇ Change rate within 10% with respect to initial viscosity
- ⁇ Significant thickening and occurrence of gelation
- As tetrafunctional (secondary) polythiol A a pentaerythritol tetrakis (3-mercaptobutyrate) having a molecular weight of 544.8 (manufactured by Showa Denko KK: Karenz MT PE1), 8 parts by weight, a viscosity modifier (manufactured by Nippon Aerosil Co., Ltd.) : AEROSIL200) 8 parts by weight in a stirrer were uniformly vacuum mixed, and then 1 part of
- Example 2 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, As tetrafunctional (secondary) polythiol A, a pentaerythritol tetrakis (3-mercaptobutyrate) having a molecular weight of 544.8 (manufactured by Showa Denko KK: Karenz MT PE1), a viscosity modifier (manufactured by Nippon Aerosil Co., Ltd.) : AEROSIL200) 8 parts by weight in a stirrer were uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irg
- Example 3 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, As tetrafunctional (primary) polythiol B, pentaerythritol tetrakis (3-mercaptopropionate) (molecular weight 488.84) (manufactured by SC Organic Chemical Co., Ltd .: PEMP), 17 parts by weight, viscosity modifier (manufactured by Nippon Aerosil Co., Ltd.) : AEROSIL200) 8 parts by weight in a stirrer were uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irg
- Example 4 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, As tetrafunctional (secondary) polythiol A, pentaerythritol tetrakis (3-mercaptobutyrate) having a molecular weight of 544.8 (manufactured by Showa Denko KK: Karenz MT PE1), 17 parts by weight, viscosity modifier (manufactured by Nippon Aerosil Co., Ltd.) : AEROSIL200) 8 parts by weight in a stirrer were uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Ir
- Example 5 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) having a molecular weight of 567.7 as trifunctional (secondary) polythiol C -After uniformly mixing 8 parts by weight of Trion (manufactured by Showa Denko KK: Karenz MT NR1) and 8 parts by weight of a viscosity modifier (manufactured by Nippon Aerosil Co., Ltd .: AEROSIL 200) with a stirrer, as a photopolymerization initiator 1 part of 1-
- Example 6 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) having a molecular weight of 567.7 as trifunctional (secondary) polythiol C -After 12 parts by weight of Trion (manufactured by Showa Denko KK: Karenz MT NR1) and 8 parts by weight of a viscosity modifier (manufactured by Nippon Aerosil Co., Ltd .: AEROSIL200) are uniformly vacuum mixed with a stirrer, the photopolymerization initiator is used.
- Example 7 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, 1,4-bis (3-mercaptobutyryloxy) butane (Showa Denko Co., Ltd .: Karenz MT BD1) having a molecular weight of 294.4 as a bifunctional (secondary) polythiol D, a viscosity modifier (Nippon Aerosil) After 8 parts by weight of AEROSIL 200) were uniformly mixed with a stirrer, 2 parts by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irgacure 184) as a photopolymerization initiator, As stabilizer, 0.04 part
- Example 8 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 18,000 (manufactured by Nippon Gosei Kagaku: UV-3000B), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as an acrylic monomer, Dipentaerythritol hexakis (3-meltcaptopropionate) having a molecular weight of 783.03 as hexafunctional (primary) polythiol E (SC Organic Chemical Co., Ltd .: DPMP) 11 parts by weight, viscosity modifier (Nippon Aerosil Co., Ltd.) ): AEROSIL200) 8 parts by weight with a stirrer were uniformly vacuum mixed, and then 1-hydroxy-cyclohexyl-phenyl-ketone (BASF Japan KK: Irgacure 184) 2 parts by weight as a photopolymerization initiator
- Comparative Example 1 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 13,000 (Nippon Kayaku Co., Ltd .: KAYARAD UX-3204), phenol acrylate as an acrylic monomer (Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) 60 parts by weight and 8 parts by weight of a viscosity adjusting agent (manufactured by Nippon Aerosil Co., Ltd .: AEROSIL200) were uniformly vacuum-mixed with a stirrer, and then 1-hydroxy-cyclohexyl-phenyl-ketone (BASF Japan Ltd.) as a photopolymerization initiator.
- urethane acrylic oligomer A having a weight average molecular weight of 13,000 (Nippon Kayaku Co., Ltd .: KAYARAD UX-3204), phenol acrylate as an acrylic monomer (Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-
- Irgacure 184) 2 parts by weight, 0.02 part by weight of 1,4-benzenediol (manufactured by Mitsui Chemicals, Inc .: hydroquinone) as a stabilizer is added, uniformly mixed and defoamed with a stirrer, and photocured. A sex sealing material was obtained.
- Comparative Example 2 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 13,000 (Nippon Kayaku Co., Ltd .: KAYARAD UX-3204), phenol acrylate as an acrylic monomer (Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) 60 parts by weight, 5 parts by weight of pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko KK: Karenz MT PE1) having a molecular weight of 544.8 as a tetrafunctional (secondary) polythiol A, a viscosity modifier (Nippon Aerosil) After 8 parts by weight of AEROSIL 200) were uniformly mixed with a stirrer, 2 parts by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irgacure 184) as a photopolymerization
- Comparative Example 3 100 parts by weight of urethane acrylic oligomer A having a weight average molecular weight of 13,000 (Nippon Kayaku Co., Ltd .: KAYARAD UX-3204), phenol acrylate as an acrylic monomer (Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) 60 parts by weight, tetrafunctional (secondary) polythiol A with a molecular weight of 544.8 pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko KK: Karenz MT PE1), 38 parts by weight, a viscosity modifier (Nippon Aerosil) After 8 parts by weight of AEROSIL 200) were uniformly mixed with a stirrer, 2 parts by weight of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irgacure 184) as a photopolymerization initiator,
- Comparative Example 4 100 parts by weight of urethane acrylic oligomer B having a weight average molecular weight of 4,500 (manufactured by Kyoeisha Co., Ltd .: UF-8001G), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as the acrylic monomer 7 parts by weight of pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko KK: Karenz MT PE1) having a molecular weight of 544.8 as a tetrafunctional (secondary) polythiol A, a viscosity modifier (Nippon Aerosil Co., Ltd.) (Product: AEROSIL200) 8 parts by weight with a stirrer was uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .:
- Comparative Example 5 100 parts by weight of urethane acrylic oligomer B having a weight average molecular weight of 4,500 (manufactured by Kyoeisha Co., Ltd .: UF-8001G), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as the acrylic monomer 17 parts by weight of pentaerythritol tetrakis (3-mercaptobutyrate) (manufactured by Showa Denko KK: Karenz MT PE1) having a molecular weight of 544.8 as a tetrafunctional (secondary) polythiol A, a viscosity modifier (Nippon Aerosil Co., Ltd.) (Product: AEROSIL200) 8 parts by weight with a stirrer was uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .:
- Comparative Example 6 100 parts by weight of urethane acrylic oligomer B having a weight average molecular weight of 4,500 (manufactured by Kyoeisha Co., Ltd .: UF-8001G), 60 parts by weight of phenol acrylate (manufactured by Daiichi Pharmaceutical Co., Ltd .: New Frontier PHE-2) as the acrylic monomer As tetrafunctional (secondary) polythiol A, pentaerythritol tetrakis (3-mercaptobutyrate) having a molecular weight of 544.8 (manufactured by Showa Denko KK: Karenz MT PE1), a viscosity modifier (Nippon Aerosil Co., Ltd.) (Product: AEROSIL200) 8 parts by weight with a stirrer was uniformly vacuum mixed, and then 1 part of 1-hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irgacure
- Comparative Example 7 100 parts by weight of urethane acrylic oligomer B having a weight average molecular weight of 4,500 (manufactured by Kyoeisha Co., Ltd .: UF-8001G), pentaerythritol tetrakis (3-mercaptobutyrate) having a molecular weight of 544.8 as tetrafunctional (secondary) polythiol
- a 4 parts by weight (manufactured by Showa Denko KK: Karenz MT PE1) and 8 parts by weight of a viscosity modifier (manufactured by Nippon Aerosil Co., Ltd .: AEROSIL 200) were uniformly mixed by vacuum with a stirrer, and then 1- 2 parts by weight of hydroxy-cyclohexyl-phenyl-ketone (manufactured by BASF Japan Ltd .: Irgacure 184) and 0.02 part by weight of 1,4-benzenediol (manufactured by Mitsu
- the sealing material of the present invention obtained in Examples 1 to 8 has a high compression recovery rate, high tensile strength, excellent flexibility, and low hardness as compared with the comparative example.
- thiol addition shows good adhesion, low surface tack, and good storage stability.
- Comparative Examples 4 to 7 were further tried to approximate the experiments described in Table 2 of Patent Document 7 as much as possible. Low.
- the amount of the thiol compound was increased in order to make the hardness as low as possible. However, the hardness still exceeded 50 and could not be used as a casing sealing material.
- Comparative Examples 1 and 2 when the polythiol compound is not added and the acryloyl group / thiol group ratio is 100 / 5n or less, the hardness is high and good softness cannot be obtained, and the elongation is low. On the contrary, as shown in Comparative Example 3, when the polythiol compound was added until the acryloyl group / thiol group ratio exceeded 100 / 25n, sufficient cohesive force was not obtained and the film physical properties could not be measured.
- Example 4 a polycarbodiimide compound (Nisshinbo Chemical Co., Ltd .: Elasto Stub H01) was added in the amount shown in Table 3 below to obtain a photocurable sealing material of the present invention.
- the storage stability is remarkably improved by adding a carbodiimide compound.
- the photocurable sealing material of Example 4 was stored at 23 ° C., it was stable for one month but then gelled.
- the photocurable sealing materials of Examples 9 to 11 to which the carbodiimide compound was added were stable for 6 months or more and had excellent storage stability.
- the temperature of 23 degreeC is an upper limit temperature in cold dark place preservation
- the present invention has a high compression recovery rate, high tensile strength, excellent flexibility, low hardness as required, and thereby has excellent sealing properties such as airtightness and waterproofness, and also has less surface tack.
- Material is provided.
- a photocurable sealing material having storage stability can be provided by easily and instantaneously curing to the deep part of the photocurable sealing material to produce the same sealing material.
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Abstract
Description
(A)(メタ)アクリロイル基を有するオリゴマー100重量部に対して、(B)(メタ)アクリレートを5~100重量部含み、
(A)(メタ)アクリロイル基を有するオリゴマーおよび(B)(メタ)アクリレートモノマーの双方に含まれる(メタ)アクリロイル基と、(C)ポリチオール化合物のメルカプト基との、光硬化性シーリング用材料に存在する数の比が、100:5n~100:25n(nは、ポリチオール化合物1分子中のメルカプト基の数である。)である、
光硬化性シーリング用材料。
(A)重量平均分子量が10,000~30,000である(メタ)アクリロイル基を有するオリゴマー
(A)のオリゴマーの重量平均分子量は10,000~30,000であるが、好ましくは、重量平均分子量が12,000~25,000のオリゴマーが挙げられ、より好ましくは重量平均分子量が15,000~22,000のオリゴマーが挙げられる。(A)のオリゴマーは、好ましくは、分子内に少なくとも2個の(メタ)アクリレート基を有するオリゴマーが挙げられ、(A)のオリゴマーの1分子中の(メタ)アクリレート基の個数は、例えば2~10個であり、好ましくは2~6個であり、より好ましくは2~4個であり、特に好ましくは2個である。
(メタ)アクリレートモノマーとしては、分子内に(メタ)アクリロイル基を少なくとも1個有する(メタ)アクリレートモノマーが挙げられ、具体的には、(メタ)アクリロイル基を1個有する単官能モノマー、2個有する二官能モノマー、3個有する三官能モノマー、4個有する四官能モノマー等が挙げられる。
ポリチオール化合物としては、例えば、分子内にメルカプト基を2~10個有する化合物が挙げられ、好ましくは、分子内にメルカプト基を2~6個有するものが挙げられ、より好ましくは、分子内にメルカプト基を3~4個有するものが挙げられる。
(a)炭化水素構造を含むポリチオール化合物(C2-20アルカンポリチオール等の脂肪族ポリチオール類、キシリレンジチオール等の芳香脂肪族ポリチオール類、アルコール類のハロヒドリン付加物のハロゲン原子をメルカプト基で置換してなるポリチオール類、ポリエポキシド化合物の硫化水素反応生成物からなるポリチオール化合物等)、
(b)式(1)
mは0、1または2であり、nは0または1である。)
で示されるエーテル構造を含むポリチオール化合物、および
(c)式(2)
で示されるエステル構造を含むポリチオール化合物が挙げられる。これらポリチオール化合物の中で好ましいものとして、(b)エーテル構造を含むポリチオール化合物および(c)エステル構造を含むポリチオール化合物が挙げられ、より好ましくは(c)エステル構造を含むポリチオール化合物が挙げられる。
(a)炭化水素構造を含むポリチオール化合物としては、2,5-ヘキサンジチオール、2,9-デカンジチオール、1,4-ビス(1-メルカプトエチル)ベンゼン等が挙げられる。
(b)エーテル構造を含むポリチオール化合物としては、例えば、2-メルカプトエチルエーテル基、2-メルカプトプロピルエーテル基、3-メルカプトプロピルエーテル基、2-メルカプトブチルエーテル基、3-メルカプトブチルエーテル基、4―メルカプトブチルエーテル基、5-メルカプトペンチルエーテル基、5-メルカプトヘキシルエーテル基等の構造を有する化合物が挙げられる。
(c)エステル構造を含むポリチオール化合物としては、式(2)の構造の左末端に水素原子が結合した化合物であるメルカプト基含有カルボン酸と多価アルコール類とをエステル化することで生成される化合物が含まれる。
L-C(O)-O-は前記式(2)で示される構造を表わす。)
で示されるポリチオール化合物が挙げられる。式(3)におけるR3~R6のC1-10アルキル基としては、直鎖または分岐鎖のC1-3アルキル基が好ましく、具体的には、メチル基、エチル基、n-プロピル基、イソプロピル基等が挙げられ、中でもメチル基、エチル基が好ましい。R3が水素原子、メチル基またはエチル基であり、R4~R6が全て水素原子であるポリチオール化合物が特に好ましい。
好ましいポリチオール化合物としては、2級メルカプト基を有する化合物が挙げられる。2級チオール化合物は、それ自体の貯蔵安定性が1級チオール化合物と比較して優れている。また、本発明の光硬化性シーリング用材料を用いて生成されるシーリング材は、従来知られた光硬化性シーリング材よりも優れたシーリング特性を有するが、2級チオールを有するポリチオール化合物を用いた場合は、塗付時の塗付安定性およびシーリング特性の安定性に優れる。特に硬度と柔軟性に関して優れた特性を安定して得られる。その理由としては、例えば、チオール基周辺の立体障害によって、エン-チオール反応でのラジカル反応と熱付加反応のバランスが好ましく調整されていると推察される。
カルボジイミド化合物とは、ポリエステル等の樹脂の加水分解によって生じる水酸基またはカルボキシル基を除去することで加水分解の連鎖を抑制する耐加水分解安定剤(耐加水分解剤)を言う。カルボジイミド化合物としては、モノカルボジイミド化合物およびポリカルボジイミド化合物等が挙げられ、一般に広く知られており、それらはいずれも使用することができる。カルボジイミド化合物は、例えば、特開平9-309871、特開平9-249801、特開平9-208649、特開平9-296097、特開平8-81533、特開平8-27092、特開平9-136869、特開平9-124582、特開平9-188807、特開2005-82642、特開2005-53870、特開2012-36392、特開2010-163203、特開2011-174094、WO2008/072514、特開2012-81759、特開2012-52014、特開2012-7079等に記載されたものが挙げられる。
[式中、R11は、同一であるか、または異なって、2価の芳香族基および/または脂肪族基である。
ポリマーカルボジイミドの場合、mは、5より大きい整数である。]
で表わされる化合物が挙げられる。
光ラジカル重合開始剤としては、例えば、分子内開裂型および/または水素引き抜き型の光ラジカル重合開始剤を用いることができ、好ましくは分子内開裂型光ラジカル重合開始剤が挙げられる。ラジカル性の紫外線重合開始剤としては、公知のものを適当に使用できるが、具体的には、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等のベンゾイン類およびそれらのアルキルエーテル類;アセトフェノン、2,2-ジメトキシ-2-フェニルアセトフェノン、1,1-ジクロロアセトフェノン、4-(1-t-ブチルジオキシ-1-メチルエチル)アセトフェノン、ジエトキシアセトフェノン等のアセトフェノン類;2-メチルアントラキノン、2-アミルアントラキノン、2-t-ブチルアントラキノン、1-クロロアントラキノン等のアントラキノン類;2,4-ジメ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-クロロチオキサントン等のチオキサントン類;アセトフェノンジメチルケタール、ベンジルジメチルケタール等のケタール類;ベンゾフェノン、4-(1-t-ブチルジオキシ-1-メチルエチル)ベンゾフェノン、3,3’,4,4’-テトラキス(t-ブチルジオキシカルボニル)ベンゾフェノン等のベンゾフェノン類;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、2-ベンジル-2-ジメチルアミノ-1-(4-モルホリノフェニル)-1-ブタノン等のα-アミノアルキルフェノン類;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-1{4-[4-(2-ヒドロキシ-2-メチル-プロビオニル)-ベンジル]フェニル}-2-メチル-プロパン-1-オン、2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン等のα-ビドロキシアルキルフェノン類;アルキルフェニルグリオキシレート等のフェニルグリオキシレート類;ジエトキシアセトフェノン;2,4,6-トリメチルベンゾイルフェニルエトキシホスフィンオキサイド等のアシルホスフィンオキサイド類;ビス(5,2,4-シクロペンタジエン-1-イル)-ビス(2,6-ジフルオロ-3-(1H-ピロール-1-イル)-フェニル)チタニウム等のチタノセン化合物等およびこれらの2種以上の組合せが挙げられる。
粘性調整剤としては、特に限定されるものではないが、ホワイトカーボン、コロイダルシリカ、珪砂(珪石粉)、アエロジル、珪藻土、疎水性炭酸カルシウム、ガラスバルーン、ガラスビーズ、ポリビニルピロリドン等が挙げられる。これらの粘性調整剤は、単独で用いられても良いし、2種類以上が併用されても良い。好ましい粘性調整剤としては、アエロジル等の無機系粘性調整剤が挙げられる。
紫外線のみでなく、可視光および近赤外線を用いても、光硬化できるように、増感剤を添加することもできる。増感剤としては、例えば、カルコン誘導体、ジベンザルアセトン等の不飽和ケトン類、カンファーキノン等の1,2-ジケトン誘導体、ベンゾイン誘導体、フルオレン誘導体、ナフトキノン誘導体、アントラキノン誘導体、キサンテン誘導体、チオキサンテン誘導体、キサントン誘導体、チオキサントン誘導体、クマリン誘導体、ケトクマリン誘導体、シアニン誘導体、メロシアニン誘導体、オキソノ-ル誘導体等のポリメチン色素、アクリジン誘導体、アジン誘導体、チアジン誘導体、オキサジン誘導体、インドリン誘導体、アズレン誘導体、アズレニウム誘導体、スクアリリウム誘導体、ポルフィリン誘導体、テトラフェニルポルフィリン誘導体、トリアリールメタン誘導体、テトラベンゾポルフィリン誘導体、テトラピラジノポルフィラジン誘導体、フタロシアニン誘導体、テトラアザポルフィラジン誘導体、テトラキノキサリロポルフィラジン誘導体、ナフタロシアニン誘導体、サブフタロシアニン誘導体、ピリリウム誘導体、チオピリリウム誘導体、テトラフィリン誘導体、アヌレン誘導体、スピロピラン誘導体、スピロオキサジン誘導体、チオスピロピラン誘導体、金属アレーン錯体、および有機ルテニウム錯体等が挙げられる。
本発明の光硬化性シーリング用材料には、さらにその他の成分を添加することができる。その他の成分としては、例えば、増感剤、増粘剤、重合禁止剤、顔料、密着性向上剤、酸化防止剤、硬化促進剤、充填剤、可塑剤、界面活性剤、滑剤、帯電防止剤等が挙げられる。これら成分は、それぞれの目的に応じて、適量添加することができる。
本発明の光硬化性シーリング用材料は、(A)重量平均分子量が10,000~30,000である(メタ)アクリロイル基を有するオリゴマー、(B)(メタ)アクリレートモノマー、(C)ポリチオール化合物、および必要に応じて(D)カルボジイミド化合物、(E)光ラジカル重合開始剤、(F)増感剤、(G)増感剤、および/またはその他の成分を、室温または加熱条件下で、ミキサー、ボールミル、3本ロールミル等の混合機を用いて混合することで調製できる。また、必要におうじて、溶剤などを希釈剤として添加して溶解し、混合することで、調整することもできる。希釈剤として用いる溶剤としては、例えば、酢酸エチル、酢酸ブチル、酢酸イソプロピル等のエステル、アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン、テトラヒドロフラン、ジオキサン等の環状エーテル、N,N-ジメチルホルムアミド等のアミド、トルエン等の芳香族炭化水素、塩化メチレン等のハロゲン化炭化水素等が挙げられる。
本発明の光硬化性シーリング用材料の硬化させる方法としては、特に制限されないが、例えば、エネルギー線を照射することで実施できる。用いられるエネルギー線としては、光、放射線、電磁波等が挙げられ、具体的には、紫外線、可視光、赤外線、α線、β線、γ線、電子線等が挙げられる。操作性や生産性及び経済性などの観点から、紫外線を用いることが好ましい。エネルギー線の照射時間としては、用いるエネルギー線の種類によって適宜選択することができる。紫外線の光源としては、例えば、超高圧水銀、メタルハライド光源、レーザー、LED等の光源を使用することができる。α線、β線、γ線、電子線等を用いる場合には、光ラジカル重合開始剤を含有させなくても、速やかに硬化を進めることができるが、紫外線を用いる場合には、光ラジカル重合開始剤を本発明の光硬化性シーリング用材料に加えることが好ましい。
(1)その一方の部品の溝(ガスケット塗付部)に光硬化性シーリング用材料を均一に塗付する;
(2)その塗付された部品に紫外線等を照射することで光硬化性シーリング用材料を硬化させてガスケットを生成させる;
(3)必要に応じて内部に収納する機器を組み入れる;および
(4)その部品に他方の部品を嵌合させる。
本発明のシーリング材は、高い圧縮復元率、高い抗張力、優れた柔軟性、必要に応じて低い硬度を有し、それによって気密性、防水性等のシーリング特性が優れており、さらには表面タックが少ない。また、シーリング材の硬度はタイプAデュロメータによる測定値で言えば、好ましくは40以下、より好ましくは30以下、さらに好ましくは20以下、特に好ましくは15以下であることが望ましい。その硬度を低くするには、(B)(メタ)アクリレートモノマー、および/または(C)ポリチオール化合物の含量を増量することで、目的の硬度のものを調整することができる。それらについては、さらに実施例でより詳細に述べる。
(1)破断時抗張力、伸び率
厚み1mmのUV樹脂硬化物のシートを、JIS K 6251に準じてダンベル3号型に打ち抜き、試験片とした。試験温度23℃、引張速度100m/分の条件にて引張試験を行い、破断時抗張力及び伸び率を測定した。
・破断点抗張力[MPa]=破断強度/フィルム断面積
・伸び率[%]=(破断伸び量/基準長さ[20mm])×100
(2)硬度
JIS K 6253に準拠し、UV樹脂硬化物の厚さが約1mmシートを積層して厚さが約10mmにし、その検体を23℃中50~60%RH下でタイプAデュロメータ(高分子計器製)にてショア硬度Aを測定した。
(3)圧縮復元性
25mm角に裁断したUV樹脂硬化物のシートを積層して厚さが約5mmにし、その検体をそれぞれ25%圧縮、50%圧縮し、JIS K 6253に準拠して、試験温度70℃の条件にて圧縮復元性を測定した。
(4)表面タック
UV硬化後、厚み1mmのUV樹脂硬化物のシートを23℃中に2時間放置した後、照射表面のタックを指触にて評価した。以下にて評価した。
△:タック若干あり
×:強いタックあり
(5)貯蔵安定性
遮光した容器にUV硬化樹脂を入れ、40℃環境下に2週間放置後、状態の変化かないこと。及びブルックフィールド粘度計を用いて0.5rpmでの粘度を測定し、初期粘度と比べて10%以内の変化率であるかを確認した。
×:著しい増粘およびゲル化の発生
実施例1
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)8重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)23重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(1級)ポリチオールBとして分子量488.64のペンタエリトリトールテトラキス(3-メルカプトプロピオネート)(SC有機化学(株)製:PEMP)17重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)17重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、3官能(2級)ポリチオールCとして分子量567.7の1,3,5-トリス(3-メルカプトブチルオキシエチル)-1,3,5-トリアジン-2,4,6(1H,3H,5H)-トリオン(昭和電工(株)製:カレンズMT NR1)8重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、3官能(2級)ポリチオールCとして分子量567.7の1,3,5-トリス(3-メルカプトブチルオキシエチル)-1,3,5-トリアジン-2,4,6(1H,3H,5H)-トリオン(昭和電工(株)製:カレンズMT NR1)12重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、2官能(2級)ポリチオールDとして分子量294.4の1,4-ビス(3-メルカプトブチリルオキシ)ブタン(昭和電工(株)製:カレンズMT BD1)9重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量18,000のウレタンアクリルオリゴマーA(日本合成化学製:UV-3000B)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、6官能(1級)ポリチオールEとして分子量783.03のジペンタエリスリトールヘキサキス(3-メルトカプトプロビオネート)(SC有機化学(株)製:DPMP)11重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、本発明の光硬化性シーリング材料を得た。
重量平均分子量13,000のウレタンアクリルオリゴマーA(日本化薬(株)製:KAYARAD UX-3204)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量13,000のウレタンアクリルオリゴマーA(日本化薬(株)製:KAYARAD UX-3204)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)5重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量13,000のウレタンアクリルオリゴマーA(日本化薬(株)製:KAYARAD UX-3204)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)38重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量4,500のウレタンアクリルオリゴマーB(共栄社(株)製:UF-8001G)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)7重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量4,500のウレタンアクリルオリゴマーB(共栄社(株)製:UF-8001G)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)17重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量4,500のウレタンアクリルオリゴマーB(共栄社(株)製:UF-8001G)100重量部、アクリルモノマーとしてフェノールアクリレート(第一薬品工業(株)製:ニューフロンティアPHE-2)60重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)23重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
重量平均分子量4,500のウレタンアクリルオリゴマーB(共栄社(株)製:UF-8001G)100重量部、4官能(2級)ポリチオールAとして分子量544.8のペンタエリトリトールテトラキス(3-メルカプトブチレート)(昭和電工(株)製:カレンズMT PE1)4重量部、粘性調整剤(日本アエロジル(株)製:AEROSIL200)8重量部を攪拌器で均一に真空混合した後、光重合開始剤として1-ヒドロキシ-シクロヘキシル-フェニル-ケトン(BASFジャパン(株)製:イルガキュア184)2重量部、安定剤として1,4-ベンゼンジオール(三井化学(株)製:ハイドロキノン)0.02重量部を添加し、攪拌器で均一混合脱泡して、光硬化性シーリング材料を得た。
実施例1~8および比較例1~7で得られた光硬化性シーリング材料の各々を、厚み約1mmのシート状に成形した後、無電極メタルハライドランプ式UV照射装置(東京ホトン製FOTOCURE TFL-150 基材-ランプ間距離d=53mm、UV-A波の積算光量:約7000mJ/cm2)を用いてUV照射して硬化させ、それぞれシーリング材を調製した。積算光量は、EIT社製UV Power Packにて測定した。
実施例4において、ポリカルボジイミド化合物(日清紡ケミカル(株)製:エラストスタブ H01)を下記表3に記載の量、添加して、本発明の光硬化性シーリング用材料を得た。
Claims (11)
- (A)重量平均分子量が10,000~30,000である(メタ)アクリロイル基を有するオリゴマー、(B)(メタ)アクリレートモノマー、および(C)ポリチオール化合物、を含む、光硬化性シーリング用材料であって、
(A)(メタ)アクリロイル基を有するオリゴマー100重量部に対して、(B)(メタ)アクリレートを5~100重量部含み、
(A)(メタ)アクリロイル基を有するオリゴマーおよび(B)(メタ)アクリレートモノマーの双方に含まれる(メタ)アクリロイル基と、(C)ポリチオール化合物のメルカプト基との、光硬化性シーリング用材料に存在する数の比が、100:5n~100:25n(nは、ポリチオール化合物1分子中のメルカプト基の数である。)である、
光硬化性シーリング用材料。 - さらに(D)カルボジイミド化合物を、(A)(メタ)アクリロイル基を有するオリゴマー100重量部に対して0.1~15重量部含む、請求項1記載の光硬化性シーリング用材料。
- (C)ポリチオール化合物が1分子中にメルカプト基を2~6個有し、そのメルカプト基が2級である、請求項1または2に記載の光硬化性シーリング用材料。
- (C)ポリチオール化合物が、水酸基を2~6個有する多価アルコールとβ-メルカプトブタン酸とから生成されるエステルである、請求項1または2に記載の光硬化性シーリング用材料。
- (B)(メタ)アクリレートモノマーが、単官能(メタ)アクリレート、多官能(メタ)アクリレートまたはこれらの組合せである、請求項1~4のいずれかに記載の光硬化性シーリング用材料。
- (A)(メタ)アクリロイル基を有するオリゴマーが、ウレタン系(メタ)アクリレートオリゴマー、ポリエステル系(メタ)アクリレートオリゴマー、ポリエーテル系(メタ)アクリレートオリゴマー、エポキシ系(メタ)アクリレートオリゴマー、共役ジエン重合体系(メタ)アクリレートオリゴマーおよびそれらの水素添加物を含む群から選択される少なくとも1種である、請求項1~5のいずれかに記載の光硬化性シーリング用材料。
- さらに(E)光ラジカル重合開始剤および/または(F)粘性調整剤を含む、請求項1~6のいずれかに記載の光硬化性シーリング用材料。
- 請求項1~7のいずれかに記載の光硬化性シーリング用材料を光硬化させることによる、シーリング方法。
- 請求項1~7のいずれかに記載の光硬化性シーリング用材料を光硬化させることによって生成されるシーリング材。
- 請求項1~7のいずれかに記載の光硬化性シーリング用材料を光硬化させることによって生成されるシーリング材を用いる筐体。
- カルボジイミド化合物を含有する、エン-チオール系光硬化性樹脂材料のための安定化剤。
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| CN104755579A (zh) | 2015-07-01 |
| CN104755579B (zh) | 2017-05-31 |
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