WO2012077720A1 - 光重合開始剤に適した化合物、光重合開始剤及び光硬化性樹脂組成物 - Google Patents
光重合開始剤に適した化合物、光重合開始剤及び光硬化性樹脂組成物 Download PDFInfo
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- WO2012077720A1 WO2012077720A1 PCT/JP2011/078333 JP2011078333W WO2012077720A1 WO 2012077720 A1 WO2012077720 A1 WO 2012077720A1 JP 2011078333 W JP2011078333 W JP 2011078333W WO 2012077720 A1 WO2012077720 A1 WO 2012077720A1
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- Prior art keywords
- compound
- photopolymerization initiator
- liquid crystal
- resin composition
- photocurable resin
- Prior art date
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- XYXBMCIMPXOBLB-UHFFFAOYSA-N 3,4,5-tris(dimethylamino)-2-methylphenol Chemical compound CN(C)C1=CC(O)=C(C)C(N(C)C)=C1N(C)C XYXBMCIMPXOBLB-UHFFFAOYSA-N 0.000 description 1
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- 239000004135 Bone phosphate Substances 0.000 description 1
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- 238000005090 crystal field Methods 0.000 description 1
- UURSXESKOOOTOV-UHFFFAOYSA-N dec-5-ene Chemical compound CCCCC=CCCCC UURSXESKOOOTOV-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
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- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 1
- XXBDWLFCJWSEKW-UHFFFAOYSA-N dimethylbenzylamine Chemical compound CN(C)CC1=CC=CC=C1 XXBDWLFCJWSEKW-UHFFFAOYSA-N 0.000 description 1
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- PJPRFQPMDKJMRW-UHFFFAOYSA-N hexadecanedihydrazide Chemical compound NNC(=O)CCCCCCCCCCCCCCC(=O)NN PJPRFQPMDKJMRW-UHFFFAOYSA-N 0.000 description 1
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- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
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- 238000005342 ion exchange Methods 0.000 description 1
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- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
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- 238000001000 micrograph Methods 0.000 description 1
- MGKYTFDYDXZTEM-UHFFFAOYSA-N n,n-dibutyl-2,3,4,6,7,8,9,10-octahydropyrimido[1,2-a]azepin-10-amine Chemical compound CCCCN(CCCC)C1CCCCN2CCCN=C12 MGKYTFDYDXZTEM-UHFFFAOYSA-N 0.000 description 1
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- VMFUMDXVTKTZQY-UHFFFAOYSA-N naphthalene-1-carbohydrazide Chemical compound C1=CC=C2C(C(=O)NN)=CC=CC2=C1 VMFUMDXVTKTZQY-UHFFFAOYSA-N 0.000 description 1
- LKKPNUDVOYAOBB-UHFFFAOYSA-N naphthalocyanine Chemical compound N1C(N=C2C3=CC4=CC=CC=C4C=C3C(N=C3C4=CC5=CC=CC=C5C=C4C(=N4)N3)=N2)=C(C=C2C(C=CC=C2)=C2)C2=C1N=C1C2=CC3=CC=CC=C3C=C2C4=N1 LKKPNUDVOYAOBB-UHFFFAOYSA-N 0.000 description 1
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- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 125000004043 oxo group Chemical group O=* 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- IGALFTFNPPBUDN-UHFFFAOYSA-N phenyl-[2,3,4,5-tetrakis(oxiran-2-ylmethyl)phenyl]methanediamine Chemical compound C=1C(CC2OC2)=C(CC2OC2)C(CC2OC2)=C(CC2OC2)C=1C(N)(N)C1=CC=CC=C1 IGALFTFNPPBUDN-UHFFFAOYSA-N 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N phosphoric acid Substances OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 230000002165 photosensitisation Effects 0.000 description 1
- 208000017983 photosensitivity disease Diseases 0.000 description 1
- 231100000434 photosensitization Toxicity 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
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- 150000003141 primary amines Chemical class 0.000 description 1
- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
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- TUQOTMZNTHZOKS-UHFFFAOYSA-N tributylphosphine Chemical compound CCCCP(CCCC)CCCC TUQOTMZNTHZOKS-UHFFFAOYSA-N 0.000 description 1
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- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
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- WGKLOLBTFWFKOD-UHFFFAOYSA-N tris(2-nonylphenyl) phosphite Chemical compound CCCCCCCCCC1=CC=CC=C1OP(OC=1C(=CC=CC=1)CCCCCCCCC)OC1=CC=CC=C1CCCCCCCCC WGKLOLBTFWFKOD-UHFFFAOYSA-N 0.000 description 1
- LFNXCUNDYSYVJY-UHFFFAOYSA-N tris(3-methylphenyl)phosphane Chemical compound CC1=CC=CC(P(C=2C=C(C)C=CC=2)C=2C=C(C)C=CC=2)=C1 LFNXCUNDYSYVJY-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 150000007964 xanthones Chemical class 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D335/00—Heterocyclic compounds containing six-membered rings having one sulfur atom as the only ring hetero atom
- C07D335/04—Heterocyclic compounds containing six-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
- C07D335/10—Dibenzothiopyrans; Hydrogenated dibenzothiopyrans
- C07D335/12—Thioxanthenes
- C07D335/14—Thioxanthenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached in position 9
- C07D335/16—Oxygen atoms, e.g. thioxanthones
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C229/00—Compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C229/52—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton
- C07C229/54—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton with amino and carboxyl groups bound to carbon atoms of the same non-condensed six-membered aromatic ring
- C07C229/60—Compounds containing amino and carboxyl groups bound to the same carbon skeleton having amino and carboxyl groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton with amino and carboxyl groups bound to carbon atoms of the same non-condensed six-membered aromatic ring with amino and carboxyl groups bound in meta- or para- positions
-
- 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
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
-
- 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
- C08F290/064—Polymers containing more than one epoxy group per molecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—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
- C08G59/40—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 curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4014—Nitrogen containing compounds
- C08G59/4035—Hydrazines; Hydrazides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/08—Polyhydrazides; Polytriazoles; Polyaminotriazoles; Polyoxadiazoles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/37—Thiols
- C08K5/378—Thiols containing heterocyclic rings
Definitions
- the present invention relates to a compound obtained by reacting a specific organic acid compound and / or hydroxy compound with an epoxy group-containing compound, a photopolymerization initiator and a photocurable resin composition using this compound.
- the liquid crystal dropping method is a method in which a light and heat combined curable liquid crystal sealing agent is applied onto a substrate on which an electrode pattern and an alignment film are applied, and the substrate on which the liquid crystal sealing agent is applied, or a pair of substrates. After the liquid crystal is dropped on the substrate, the opposite substrate is bonded, and the substrate is quickly fixed by photo-curing by ultraviolet irradiation or the like, so that the substrate is quickly fixed, that is, the cell gap is formed.
- a liquid crystal dropping method photocuring and thermosetting reactions proceed in a state where the uncured sealant and the liquid crystal are in contact with each other. Therefore, the liquid crystal sealant is used during the curing process, that is, before and after photocuring. Reduction of the contamination to the liquid crystal derived from the liquid crystal sealant before and after curing is required.
- a sealing agent such as an airtight sealant for electronic components is also required to reduce contamination of the electronic component derived from the sealing agent during the curing process.
- the alignment direction, the type of alignment film, and the liquid crystal material may change properties due to the influence of ultraviolet light, and the sealant can be cured in the visible light region with low energy Is required.
- Patent Document 1 discloses a photosensitizer which is a diaminobenzophenone derivative having a number average molecular weight of 400 to 3000 and a number average molecular weight of 350.
- a photocurable resin composition containing ⁇ 3000 hydrogen abstraction type photoradical polymerization initiator and a specific monomer and / or monomer is disclosed.
- Patent Document 2 discloses a reaction product of a specific epoxy compound and thioxanthonecarboxylic acid as a self-polymerizing photopolymerization initiator for curing a coating of coating material or printing ink.
- the diaminobenzophenone derivative having a specific number molecular weight which is a photosensitizer disclosed in Cited Document 1
- the functional group is an amino acid derived from a primary amine. Since it is a group, there is a problem that the storage stability becomes unstable.
- the main application of the self-polymerization type photopolymerization initiator disclosed in Citation 2 is paint and printing ink, and the outgas to be used is odor, which affects high-speed response such as a liquid crystal seal. It could not cope with the contamination level due to outgas, dissolution in liquid crystal, bleed, etc.
- the present invention has the following configuration.
- a photopolymerization initiator comprising a photoinitiating compound and a visible light sensitizing compound, The photoinitiating compound is the compound A; A photopolymerization initiator in which the visible light sensitizing compound is the compound B.
- a photocurable resin composition comprising a photopolymerizable monomer or oligomer and the photopolymerization initiator described in (2).
- the compound which can be used for the photopolymerization initiator which is suitable for sealing agents, such as a liquid crystal sealing agent, such as an electronic component, and is hard to generate outgas and has photocurability in visible region,
- sealing agents such as a liquid crystal sealing agent, such as an electronic component
- the light containing the said compound A polymerization initiator and a photocurable resin composition can be provided.
- Example 1 Contamination of Example 1 Contamination of Example 2 Contamination of Example 3 Contamination of Comparative Example 1 Contamination of Comparative Example 2 Contamination of Comparative Example 3
- the line (wiring part) / space (liquid crystal part) is 200 ⁇ m / 200 ⁇ m.
- Orientation of the wiring part of Example 4 Orientation of the wiring part of Reference Example 1
- the compound of the present invention is a compound obtained by reacting an organic acid compound and / or a hydroxy compound with a compound containing at least two epoxy groups in the molecule (hereinafter also referred to as an epoxy group-containing compound), Compound A wherein the organic acid compound is dimethylaminobenzoic acid, or Compound B wherein the hydroxy compound is hydroxythioxanthone, The carboxyl group of dimethylaminobenzoic acid and the hydroxyl group of hydroxythioxanthone react with the epoxy group of the epoxy group-containing compound to form a hydroxyl group.
- an epoxy group-containing compound a compound containing at least two epoxy groups in the molecule
- the compound of the present invention is a photopolymerization initiator for a sealant such as a liquid crystal sealant
- Compound A acts as a photoinitiated compound that is photoexcited by a visible light sensitizing compound
- Compound B acts as a visible light sensitizing compound.
- the visible light sensitizing compound refers to a compound that absorbs visible light having a wavelength of 380 nm or more, preferably 400 nm or more, and more preferably 420 nm or more.
- the compounds A and B act as a photoinitiating compound or a visible light sensitizing compound in the photocuring reaction, the compound itself does not cleave, so that the decomposition product does not volatilize and liquid crystal contamination does not occur. Since the molecular weight of the compound itself is large and hardly volatilized, liquid crystal contamination due to volatilization of the compound itself is difficult to occur. Moreover, the residue derived from diaminobenzoic acid constituting the compound A has an amino group derived from a tertiary amine and is excellent in stability because it acts as a catalyst in the photocuring reaction.
- Compound B is a so-called hydrogen abstraction type photo radical polymerization initiating compound, which absorbs active energy rays, and a photo radical polymerization initiator in a triplet excited state forms an excited state complex with a hydrogen donor, that is, an exciplex.
- a hydrogen donor that is, an exciplex.
- the compounds A and B have an OH group in the molecule and a high polarity, they are usually excellent in compatibility with a highly polar photopolymerizable oligomer used in a photocurable resin composition, Since the polarity of the liquid crystal material is different and the solubility in the liquid crystal is low, it is considered that the antifouling property of liquid crystal is excellent.
- Compound A can be produced by reacting diaminobenzoic acid, which is an organic acid compound, with an epoxy group-containing compound
- Compound B can be produced by reacting hydroxythioxanthone, which is a hydroxy compound, with an epoxy group-containing compound.
- diaminobenzoic acid or hydroxythioxanthone and an epoxy group-containing compound are preferably used in the presence of a trivalent organic phosphate compound and / or an amine compound as described below from the viewpoint of a basic catalyst and reactivity.
- 100 equivalent% of diaminobenzoic acid or hydroxythioxanthone is reacted with 1 equivalent of epoxy group.
- the reaction product is purified by removing the basic catalyst by filtration, centrifugation, or washing with water.
- an epoxy group-containing compound used when producing compounds A and B From the viewpoint of ensuring photoinitiation in which compound A is photoexcited by a visible light sensitizing compound, From the viewpoint of ensuring the visible light sensitization of compound B, it is a polyfunctional epoxy resin containing at least two epoxy groups, preferably an aliphatic or aromatic bifunctional epoxy resin.
- polyfunctional epoxy resin examples include trimethylolpropane polyglycidyl ether, glycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, sorbitol polyglycidyl ether, phenol novolac glycidyl ether, cresol novolac glycidyl ether, tetraglycidyl diaminodiphenylmethane, Glycidylaminophenol and the like
- the aromatic bifunctional epoxy resin examples include bisphenol A type diglycidyl ether, bisphenol F type diglycidyl ether, bisphenol AD type digly
- Compound A is obtained by reacting diaminobenzoic acid and diethylene glycol diglycidyl ether, which is represented by the following formula (1): Or a compound A1 represented by: The following formula (2) obtained by reacting diaminobenzoic acid and bisphenol A diglycidyl ether: Compound A2 represented by the formula is more preferable.
- Compound B is obtained by reacting hydroxythioxanthone and diethylene glycol diglycidyl ether, the following formula (3):
- Compound B2 represented by the formula is more preferred.
- the photopolymerization initiator of the present invention is A photopolymerization initiator comprising a photoinitiating compound and a visible light sensitizing compound,
- the photoinitiating compound is Compound A and / or the visible light sensitizing compound is Compound B.
- the photopolymerization initiator of the present invention is outgassed by using Compound A or Compound B in at least one of the photoinitiator compound and the visible light sensitizing compound, as compared with the conventional photopolymerization initiator. Therefore, the photocurable resin composition suitable for the sealant can be constituted.
- the compounds A and B include those described above for the compounds A and B.
- examples of the visible light sensitizing compound include alkyldiaminobenzophenone, diaminobenzophenone, alkylaminobenzoate, anthracene, thioxanthone, coumarin, ketocoumarin, Cyanine, phthalocyanine, naphthalocyanine and the like can be used, and from the viewpoint of efficiency of reactivity by energy transfer, a benzophenone skeleton and / or a thioxanthone skeleton is preferable, a thioxanthone skeleton is more preferable, and a compound B is more preferable.
- Photopolymerization initiator of the present invention when using Compound B as the visible light sensitizing compound, as the photoinitiating compound, Self-cleavable benzoin compounds, acetophenones, hydroxyacetophenones, ⁇ -aminoacetophenones, ⁇ -acyl oxime esters, acyl phosphine oxide compounds, azo compounds, etc.
- Hydrogen abstraction type benzophenones can be used, Hydrogen abstraction type benzophenones, benzoin ethers, benzyl ketals, dibenzosuberones, anthraquinones, xanthones, thioxanthones, halogenoacetophenones, dialkoxyacetophenones, hydroxyacetophenones, halogenobisimidazoles, halogenotriazines Etc.
- Hydrogen abstraction type benzophenones can benzoin ethers, benzyl ketals, dibenzosuberones, anthraquinones, xanthones, thioxanthones, halogenoacetophenones, dialkoxyacetophenones, hydroxyacetophenones, halogenobisimidazoles, halogenotriazines Etc.
- the photoinitiating compound is preferably a hydrogen abstraction type from the viewpoint of suppressing liquid crystal contamination due to outgas.
- benzophenones, anthraquinones, and thioxanthones are more preferable, thioxanthones are more preferable, and these number average molecular weights are It is preferably 500 to 3000. More preferably, compound A is used as the photoinitiating compound.
- the molar ratio of the photoinitiating compound to the visible light sensitizing compound is preferably from the viewpoint of supplying a stable and sufficient radical. It is 1/5 to 1/1, more preferably 1/3 to 1/1, and still more preferably 1/2 to 1/1.
- the photocurable resin composition of the present invention contains a photopolymerizable monomer or oligomer and the photopolymerization initiator of the present invention.
- (Meth) acrylic acid ester monomers and / or oligomers thereof and partial (meth) acrylated epoxy resins obtained by reacting bisphenol A type epoxy resins with (meth) acrylic acid are preferred, A partial (meth) acrylated epoxy resin obtained by reacting a bisphenol A type epoxy resin with (meth) acrylic acid is more preferred.
- (meth) acrylic acid ester monomers and / or oligomers thereof 2-hydroxyethyl (meth) acrylate, di-, tri- or tetraethylene glycol di (meth) acrylate, epoxy-modified di (meth) acrylate, urethane-modified di (meth) acrylate, More preferably, epoxy-modified di (meth) acrylate, urethane-modified di (meth) acrylate, More preferred is epoxy-modified di (meth) acrylate.
- a partial (meth) acrylated epoxy resin obtained by reacting a bisphenol A type epoxy resin with (meth) acrylic acid is obtained as follows. First, bisphenol A type epoxy resin and (meth) acrylic acid are added in the presence of a basic catalyst, preferably in the presence of a trivalent organic phosphoric acid compound and / or an amine compound. ⁇ 90 equivalent% is reacted. Next, the reaction product is purified by removing the basic catalyst by filtration, centrifugation, and / or washing with water.
- a known basic catalyst used by a reaction between an epoxy resin and (meth) acrylic acid can be used.
- a polymer-supported basic catalyst in which a basic catalyst is supported on a polymer can also be used.
- trivalent organic phosphorus compound examples include alkylphosphines such as triethylphosphine, tri-n-propylphosphine, tri-n-butylphosphine and salts thereof, triphenylphosphine, tri-m-tolylphosphine, tris- (2 Arylphosphines such as, 6-dimethoxyphenyl) phosphine and salts thereof, phosphorous acid triesters such as triphenyl phosphite, triethyl phosphite and tris (nonylphenyl) phosphite and salts thereof.
- alkylphosphines such as triethylphosphine, tri-n-propylphosphine, tri-n-butylphosphine and salts thereof
- triphenylphosphine tri-m-tolylphosphine
- tris- (2 Arylphosphines such as, 6-dime
- amine compound examples include secondary amines such as diethanolamine, tertiary amines such as triethylamine, triethanolamine, dimethylbenzylamine, trisdimethylaminomethylphenol, trisdiethylaminomethylphenol, 1,5,7-triazabicyclo [ 4.4.0] dec-5-ene (TBD), 7-methyl-1,5,7-triazabicyclo [4.4.0] dec-5-ene (Me-TBD), 1,8- Diazabicyclo [5.4.0] undec-7-ene (DBU), 6-dibutylamino-1,8-diazabicyclo [5.4.0] undec-7-ene, 1,5-diazabicyclo [4.3.
- secondary amines such as diethanolamine
- tertiary amines such as triethylamine, triethanolamine, dimethylbenzylamine, trisdimethylaminomethylphenol, trisdiethylaminomethylphenol, 1,5,7-triazabicyclo [ 4.
- Strongly basic amines such as non-5-ene (DBN) and 1,1,3,3-tetramethylguanidine and their salts. Of these, 1,5,7-triazabicyclo [4.4.0] dec-5-ene (TBD) is preferable.
- Examples of the salt of the amine compound include benzyltrimethylammonium chloride and benzyltriethylammonium chloride.
- the content of the photopolymerizable monomer or oligomer is preferably 50 to 90% by weight, more preferably 60 to 80% by weight, and still more preferably 70 to 80% by weight.
- the photopolymerization initiator of the present invention is preferably 0.5 to 5.0 parts by weight, more preferably 0.5 to 3.0 parts by weight with respect to 100 parts by weight.
- the photocurable resin composition containing the photopolymerization initiator of the present invention is capable of emitting light even with visible light, which greatly reduces outgassing and hardly damages liquid crystals and alignment films.
- the curable resin can be cured.
- the following problems have arisen particularly in the liquid crystal field in which the ODF method is adopted.
- the ODF method is a method in which a liquid crystal panel can be created by directly dropping and bonding liquid crystals into a closed loop of a sealing agent under vacuum, and then opening the vacuum. Compared to the conventional injection method, liquid crystal This is a mainstream method for manufacturing liquid crystal panels using a large-sized substrate.
- the liquid crystal substrate produced by the ODF method is composed of a resin that has both a (meth) acrylic group that is a photocurable functional group and an epoxy group that is a thermosetting functional group. Is temporarily cured and then thermally cured. At this time, if the reaction of the (meth) acrylic group due to ultraviolet irradiation is insufficient, or if it is not exposed to ultraviolet rays due to the shadow of wiring etc., the liquid crystal sealant component flows out to the liquid crystal during thermal curing, This may cause display defects.
- the photocurable resin composition of the present invention contains the photopolymerization initiator of the present invention, it is not only cured with visible light but also with a low irradiation amount of ultraviolet rays, so that it is a shadow portion. However, it can be cured and contribute to solving the above problems.
- the photocurable resin composition of the present invention preferably further contains a thermosetting agent in order to solve the above-described new problem at a high level.
- a thermosetting agent from the viewpoint of fast curing speed and good viscosity stability even at low temperatures, Preferred is at least one compound selected from the group consisting of mixed crystal hydrazide compounds, organic acid dihydrazide compounds, imidazole and derivatives thereof, dicyandiamide, aromatic amines, aliphatic amines and derivatives thereof, More preferred are hydrazide mixed crystal compounds and / or organic acid dihydrazide compounds, A hydrazide mixed crystal compound is more preferable.
- the hydrazide mixed crystal compound refers to a compound that satisfies the following rules (I) and (II).
- (I) Two or more crystalline hydrazide compounds having at least one hydrazide group in one molecule are heated and melted to a melting point or higher to obtain a heated melt, and then the heated melt is cooled and solidified. It must be a compound that can be obtained.
- (II) In the X-ray diffraction spectrum by CuK ⁇ ray of the compound, it has a diffraction peak peculiar to a mixed crystal at a Bragg angle (2 ⁇ ⁇ 0.2 °) of 5.5 to 7.5 °.
- a hydrazide compound having a hydrazide group is preferably contained in an amount of 5 to 70% by weight, more preferably 5 to 50% by weight, still more preferably 5 to 30% by weight, and still more preferably 10 to 20% by weight.
- the hydrazide-based mixed crystal compound can be produced by a method including a step of heating and mixing two or more crystalline hydrazide compounds to a melting point or higher and a step of cooling and solidifying the mixture.
- the crystalline hydrazide compound used as a raw material is preferably represented by the general formula (1):
- R represents a hydrogen atom, an alkyl group, or an aryl group which may have a substituent.
- A shows the alkylene group which may have a substituent, the arylene group which may have a substituent, or an oxo group.
- hydrazide compounds disclosed in paragraphs 0020 and 0021 of JP-A No. 2010-143872 are preferred.
- the crystalline hydrazide compound used as a raw material for the hydrazide-based mixed crystal compound is a dibasic compound in which at least one kind has two or more hydrazide groups from the viewpoints of melting point, thermal reactivity, and storage stability.
- the dihydrazide is preferably an acid dihydrazide
- the hydrazide compound to be combined with the dibasic acid dihydrazide may be a monohydrazide compound and / or a polyfunctional hydrazide compound such as tribasic acid trihydrazide, but there are two hydrazide compounds.
- Dibasic acid dihydrazide having the above hydrazide group is more preferable.
- dibasic acid dihydrazide Preferably, oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, pimelic acid dihydrazide, suberic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, dodencannic acid dihydrazide, hexadecanedioic acid dihydrazide, Dihydrazide, carbohydrazide, maleic acid dihydrazide, fumaric acid dihydrazide, diglycolic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, 2,6-naphthoic acid dihydrazide, 1,4-naphthoic acid dihydrazide, 4,4′-bisbenzenedihydrazide, Hydroquinone diglycolic acid dihydrazide, res
- monohydrazide compounds Preferably, it is at least one compound selected from the group consisting of acetohydrazide, propionic acid hydrazide, pentanoic acid hydrazide, lauric acid hydrazide, cyclohexanecarbohydrazide, salicylic acid hydrazide, p-hydroxybenzoic acid hydrazide, naphthoic acid hydrazide, More preferably, it is at least one compound selected from the group consisting of acetohydrazide, propionic acid hydrazide, pentanoic acid hydrazide, lauric acid hydrazide, cyclohexanecarbohydrazide and salicylic acid hydrazide.
- the content of the thermosetting agent has sufficient thermal reactivity, and from the viewpoint of maintaining storage stability,
- the amount is preferably 5 to 50 parts by weight, and more preferably 5 to 30 parts by weight.
- the photocurable resin composition of the present invention preferably contains a coupling agent such as filler particles and a silane coupling agent from the viewpoint described later, and if necessary, a photopolymerizable monomer suitable for the present invention.
- a coupling agent such as filler particles and a silane coupling agent from the viewpoint described later
- a photopolymerizable monomer suitable for the present invention oligomer, curing agent other than thermosetting agent, initiator other than photopolymerization initiator suitable for the present invention, elastomer, chain transfer agent, ion trap agent, ion exchange agent, leveling agent, pigment, dye, plasticizer, Additives such as antifoaming agents can be included.
- the filler particles are used for the purpose of improving the adhesive reliability of the curable composition by controlling the viscosity of the curable composition, improving the strength of the cured product obtained by curing the curable composition, or suppressing the linear expansion.
- inorganic particles for fillers and / or organic resin particles for fillers can be preferably used, but inorganic particles for fillers are preferable from the viewpoint of a low linear expansion coefficient and reduced cure shrinkage due to the development of adhesive strength. .
- inorganic particles for fillers calcium carbonate, magnesium carbonate, barium sulfate, magnesium sulfate, aluminum silicate, titanium oxide, alumina, zinc oxide, silicon dioxide, kaolin, talc from the viewpoint of easily obtaining a particle size suitable for a sealant.
- At least one inorganic particle selected from the group consisting of glass beads, sericite activated clay, bentonite, aluminum nitride, and silicon nitride is preferred, and at least one selected from the group consisting of silicon dioxide, talc, alumina, and bennite
- the above inorganic particles are more preferable, silicon dioxide and / or talc are more preferable, and silicon dioxide is still more preferable.
- organic resin particle for filler polymethyl methacrylate, polystyrene, and a copolymer obtained by copolymerizing these monomers and other monomers from the viewpoint of developing the effect of addition as adhesive strength by stress relaxation during curing.
- a core shell comprising at least one organic resin particle, preferably a polyester fine particle, polyurethane fine particle, rubber fine particle, and a shell containing a copolymer having a high glass transition temperature and a copolymer core having a low glass transition temperature At least selected from the group consisting of type fine particles More preferably seeds or organic resin particles, core-shell type fine particles composed of a core of a copolymer having a shell and a low glass transition temperature comprising a copolymer having a high glass transition temperature is more preferable.
- the copolymer having a high glass transition temperature is polymethacrylic acid and the copolymer having a low glass transition temperature is butyl acrylate.
- the content of the inorganic particles for the filler is based on 100 parts by weight of the photopolymerizable monomer or oligomer from the viewpoint of improvement in adhesion due to stress dispersion effect and improvement in linear expansion coefficient.
- the amount is preferably 2 to 40 parts by weight, and more preferably 5 to 30 parts by weight.
- the silane coupling agent is preferable as an adhesion aid for favorably bonding the liquid crystal sealing agent and the liquid crystal display panel.
- the silane coupling agent is at least one selected from the group consisting of ⁇ -aminopropyltrimethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, and ⁇ -isocyanatopropyltrimethoxysilane. And ⁇ -glycidoxypropyltrimethoxysilane is more preferable.
- the content of the coupling agent is 0.1 to 10 weights with respect to 100 parts by weight of the photopolymerizable monomer or oligomer from the viewpoint of maintaining adhesive strength, particularly moisture resistance strength. Part is preferable, and 0.5 to 2 parts by weight is more preferable.
- Example 1 Synthesis of Compound A1 Denacol EX-850L (diethylene glycol diglycidyl ether, manufactured by Nagase ChemteX Corporation) 13.7 g, 14.8 g of 4-dimethylaminobenzoic acid, PS-PPh 3 (basic catalyst in which triphenylphosphine (PPh 3 ) is supported on polystyrene (PS), manufactured by Biotage Corp.) 900 mg, 200 ml of toluene was mixed and stirred at 110 ° C. for 48 hours. The reaction mixture was cooled to room temperature and the catalyst was removed by filtration. The solvent was distilled off under reduced pressure to obtain an amine adduct of Denacol EX-850L. Identification was performed by HPLC, and it was confirmed that 70% or more of the target component was contained.
- PS-PPh 3 basic catalyst in which triphenylphosphine (PPh 3 ) is supported on polystyrene (PS), manufactured by Biotage Corp.
- Example 3 Synthesis of Compound B1 Denacol EX-850L (diethylene glycol diglycidyl ether, manufactured by Nagase ChemteX Corporation) 13.7 g 14.8 g of hydroxythioxanthone, PS-PPh 3 (Biotage) 900 mg, 200 ml of toluene was mixed and stirred at 110 ° C. for 48 hours. The reaction mixture was cooled to room temperature and the catalyst was removed by filtration. The solvent was distilled off under reduced pressure to obtain an amine adduct of Denacol EX-850L. Identification was performed by HPLC, and it was confirmed that the target component was contained by 60% or more.
- Example 5 A photopolymerization initiator composed of 1 part by weight of photoinitiating compound A1 and 1 part by weight of visible light sensitizing compound B1 was dissolved in 100 parts by weight (100 g) of photopolymerizable oligomer PR-850CRP. Thereafter, 1 part by weight of a coupling agent, 10 parts by weight of an inorganic filler, and 15 parts by weight of a thermosetting agent are mixed, and using a three roll mill (roll dimensions, ⁇ 121 ⁇ 250 mm, manufactured by Inoue Seisakusho Co., Ltd.), a pressure of 5 MPa, two passes. Were sufficiently kneaded to obtain a curable resin composition.
- Example 6 and 7 and Comparative Examples 1 to 3 Under the same conditions as in Example 5, the compositions of Examples 6 and 7 and Comparative Examples 1 to 3 shown in Table 1 were mixed and then sufficiently kneaded using three rolls to obtain each resin composition.
- EHA product name: DAROCURE EHA, component name: 2-ethylhexyl-4- (dimethylamino) benzoate, manufactured by BASF
- DETX product name: Photocure DETX, component name: 2,4-diethylthioxanthone, manufactured by EUTEC CHEMICAL
- Example 8 A photopolymerization initiator composed of 1 part by weight of photoinitiating compound A1 and 1 part by weight of visible light sensitizing compound B1 was dissolved in 100 parts by weight (100 g) of photopolymerizable oligomer PR-850CRP. Thereafter, 1 part by weight of a coupling agent, 10 parts by weight of an organic filler, 5 parts by weight of an inorganic filler, and 15 parts by weight of a thermosetting agent are mixed, and a three-roll mill (roll dimensions, ⁇ 121 ⁇ 250 mm, manufactured by Inoue Seisakusho) is used. Then, the mixture was sufficiently kneaded in two passes at a pressure of 5 MPa to obtain a curable resin composition.
- a coupling agent 10 parts by weight of an organic filler, 5 parts by weight of an inorganic filler, and 15 parts by weight of a thermosetting agent are mixed, and a three-roll mill (roll dimensions, ⁇ 121 ⁇ 250 mm, manufactured by Inoue Seis
- Example 9 to 12 and Reference Example 1 Under the same conditions as in Example 8, the compositions of Examples 9 to 12 and Reference Example 1 shown in Table 2 were mixed and then sufficiently kneaded using three rolls to obtain each photocurable resin composition.
- UV irradiation device UVX-01224S1, manufactured by Ushio
- the reaction rate was calculated based on the decrease in the area of 1630 cm ⁇ 1 (or 945 cm ⁇ 1 ) absorption of the (meth) acrylic group based on the area of 1500 cm ⁇ 1 absorption of the double bond of the benzene ring.
- Outgas amount TG-DTA (manufactured by Rigaku Corporation) was used to measure outgas at 120 ° C for 60 minutes, and the amount of volatile components from the sealant was compared. When the amount of volatile components is 1.5% or less, When the amount of volatile components is 1.5% or more, “ ⁇ ” It was.
- test liquid crystal cell ultraviolet (UV irradiation apparatus: UVX-01224S1, manufactured by Ushio Inc., illuminance: 200mJ: 100mW / cm 2 / 365nm in 2 seconds) and then cured by irradiation with, Thereafter, thermosetting was performed in a hot air oven at 120 ° C. for 1 hour to prepare a test-use cured liquid crystal cell for an orientation test.
- thermosetting was performed in a hot air oven at 120 ° C. for 1 hour to prepare a test-use cured liquid crystal cell for an orientation test.
- the alignment state of the liquid crystal at the time of sealing was confirmed.
- the confirmation was performed with an optical microscope, and the polarizing plate was observed in a transmission state with a test cell sandwiched in a crossed Nicol state.
- 1 to 6 show micrographs showing the alignment state of the corners of the test cured liquid crystal cell.
- 1 to 6 are all a scale of 900 ⁇ m in length ⁇ 1200 ⁇ m in width.
- the evaluation criteria for the orientation of the liquid crystal was judged by the presence or absence of alignment disorder during sealing. “ ⁇ ” indicates that the alignment disorder is 50 ⁇ m or less during sealing. ⁇ X '' when there is more alignment disorder It was.
- the photocurable resin composition immediately after preparation as a measurement object was allowed to stand at 25 ° C. for 5 days,
- the viscosity of the photocurable resin composition after 5 days was measured by the above method,
- the initial viscosity is the viscosity immediately after preparation of the photocurable resin composition,
- the rate of change from the initial viscosity was calculated to evaluate stability. When the measurement range was exceeded, measurement was impossible. Note that the measurement range over reference is 1,200,000 mPa ⁇ s.
- Thermosetting The viscosity of the photocurable resin composition to be measured by a rotational rheometer (Rheo Stress 300, manufactured by Haake) is After thermosetting starts, If the saturated viscosity is reached within 60 minutes, “ ⁇ ”, “ ⁇ ” indicates that the saturated viscosity is reached within 120 minutes. “X” indicates that the saturated viscosity is not reached even after 120 minutes. Judged.
- the measurement of viscosity is The viscosity change at 120 ° C. was measured for the photocurable resin composition to be measured using a rotary rheometer (Rheo Stress 300, manufactured by Haake). Using a parallel plate, the sample amount was 0.6 g, the gap was 1 mm, and the strain control mode.
- the temperature was raised from room temperature to 120 ° C. at 20 ° C./min, and measurement was performed for 120 minutes while maintaining 120 ° C. The time to reach a viscosity (saturated viscosity) at which no change in viscosity was observed was measured.
- An electric characteristic evaluation cell was fabricated using a liquid crystal sample for electric characteristic evaluation.
- the cell was prepared by using a commercially available sealing agent (World Lock No. 5) on an ITO glass substrate (55 mm ⁇ 60 mm ⁇ 0.7 mmt) with a rubbing-treated alignment film for TN liquid crystal (Sunever SE-7492, manufactured by Nissan Chemical Industries, Ltd.).
- a liquid crystal sample for electrical property evaluation is dropped on the substrate, and the upper and lower substrates are bonded together by a liquid crystal dropping method (ODF method), and ultraviolet rays (UV irradiation) device: UVX-01224S1, manufactured by Ushio Inc., illuminance and radiation time: 3000mJ, 100mW / cm 2 / 365nm at 30 sec) and then cured by irradiation with, followed for 1 hour thermoset at 120 ° C. in a hot air oven, electric A test liquid crystal cell for characteristic evaluation was prepared.
- ODF method liquid crystal dropping method
- UV irradiation ultraviolet rays
- the voltage holding ratio was measured using a liquid crystal physical property evaluation apparatus (6254C, manufactured by Toyo Technica Co., Ltd.). The voltage holding ratio at an applied voltage of 5 V, 60 Hz, and 16 msec was measured. The measurement was performed at 50 ° C. The evaluation criteria for the electrical characteristics were judged from the value of the voltage holding ratio. When the value of the voltage holding ratio is 98% or more, “ ⁇ ”, “ ⁇ ” when the voltage holding ratio is 98% or less It was.
- the photocurable resin composition thus obtained was subjected to a rubbing treatment with a seal dispenser at a cross-sectional area of 4000 ⁇ m 2 and a wiring pattern with an alignment film (Sunever SE-5661, manufactured by Nissan Chemical Industries Ltd.) (Cr / line: Dispense coating was performed on a glass substrate (200 mm / 200 mm) (60 mm ⁇ 70 mm ⁇ 0.7 mmt). Thereafter, liquid crystal (VA liquid crystal, MLC-6609, manufactured by Merck & Co., Inc.) is dropped on the substrate, the gap is set to 4 ⁇ m, and the upper and lower substrates are bonded together by the liquid crystal dropping method (ODF method) to produce a test liquid crystal cell. did.
- test liquid crystal cell ultraviolet (UV irradiation apparatus: UVX-01224S1, manufactured by Ushio Inc., illuminance and radiation time: 3000mJ, 100mW / cm 2 / 365nm at 10 sec) and then cured by irradiation with hot air thereafter 120 ° C.
- Heat curing was performed in an oven for 1 hour to prepare a test-use liquid crystal cell for an orientation test.
- the orientation state of the liquid crystal at the time of sealing between wiring was confirmed.
- the confirmation was performed with an optical microscope, and the polarizing plate was observed in a transmission state with a test cell sandwiched in a crossed Nicol state.
- FIGS. 7 to 9 Photomicrographs showing the alignment state of the wiring portion of the test cured liquid crystal cell are shown in FIGS. 7 to 9 are all scales of 900 ⁇ m in length ⁇ 1200 ⁇ m in width.
- the evaluation criteria for the orientation of the liquid crystal was judged by the presence or absence of alignment disorder during sealing. “ ⁇ ” indicates that the alignment disorder is 20 ⁇ m or less during sealing. ⁇ X '' when there is more alignment disorder It was.
- the compounds A1, A2, B1 and B2 of the present invention, the photopolymerization initiator and the photocurable resin composition using this compound are useful as the photoinitiator of the liquid crystal sealant for the dropping method. Is high. According to the above results (Table 2), when the thermosetting compound was further added to the compounds A1, A2, B1 and B2 of the present invention, and when the thermosetting compound was a hydrazide mixed crystal compound, these compounds were used. It has been clarified that the photopolymerization initiator and the photocurable resin composition can be used as a liquid crystal sealant useful for producing a high-quality liquid crystal panel.
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Abstract
Description
液晶滴下工法とは、光及び熱併用硬化型液晶シール剤を、電極パターン及び配向膜の施された基板上へ塗布し、さらにその液晶シール剤が塗布された基板、又はこれと対となる基板に液晶を滴下した後、対向基板を貼り合わせて、第一段階として紫外線照射等により光硬化を行うことで基板の速やかな固定つまりセルギャップ形成を行い、第二段階として圧締治具フリーによる熱硬化によりシール剤を完全硬化させることで、液晶表示パネルを製造する手法である。
このような液晶滴下工法では、未硬化のシール剤と液晶とが接触した状態で光硬化ならびに熱硬化反応が進行するため、液晶シール剤には、硬化の工程中、すなわち、光硬化前後、熱硬化前後における液晶シール剤由来の液晶への汚染の低減が求められる。
同様に、電子部品の気密シール剤等の封止剤にも、硬化の工程中における封止剤由来の電子部品への汚染の低減が求められる。
塗料のコーティングや印刷インキを硬化させるための自己重合型光重合開始剤として、特許文献2に、特定のエポキシ化合物とチオキサントンカルボン酸との反応生成物が開示されている。
また、引用文献2に開示される自己重合型光重合開始剤の主な用途は、塗料や印刷インキであり、課題とするアウトガスは臭気であり、液晶シールのような高速応答性に影響を与えるアウトガス、液晶への溶解、ブリード等による汚染レベルに対応できるものではなかった。
(1)有機酸化合物および/またはヒドロキシ化合物と分子中に少なくとも2個のエポキシ基を含有する化合物とを反応させて得られる化合物であって、前記化合物が、
前記有機酸化合物がジメチルアミノ安息香酸である化合物A、又は、
前記ヒドロキシ化合物がヒドロキシチオキサントンである化合物Bである化合物。
(2)光開始性化合物と可視光増感性化合物とからなる光重合開始剤であって、
前記光開始性化合物が前記化合物Aであり、
前記可視光増感性化合物が前記化合物Bである光重合開始剤。
(3)光重合性モノマー又はオリゴマーと前記(2)記載の光重合開始剤とを含む光硬化性樹脂組成物。
本発明の化合物は、有機酸化合物および/またはヒドロキシ化合物と分子中に少なくとも2個のエポキシ基を含有する化合物(以下、エポキシ基含有化合物ともいう)とを反応させて得られる化合物であって、
前記有機酸化合物がジメチルアミノ安息香酸である化合物A、又は、
前記ヒドロキシ化合物がヒドロキシチオキサントンである化合物Bであり、
ジメチルアミノ安息香酸のカルボキシル基及びヒドロキシチオキサントンの水酸基が、エポキシ基含有化合物のエポキシ基と反応して水酸基を形成している。
化合物Aは可視光増感性化合物によって光励起される光開始性化合物として作用し、
化合物Bは可視光増感性化合物として作用する。
ここで、可視光増感性化合物とは、波長が380nm以上、好ましくは400nm以上、より好ましくは420nm以上の可視光に光吸収を有する化合物をいい、光開始性化合物とは、前記可視光に光吸収を有さないが、紫外光に対して吸収を有し、ラジカルを発生する化合物をいう。
化合物Bは、ヒドロキシ化合物であるヒドロキシチオキサントンとエポキシ基含有化合物とを反応させて製造することができる。
化合物Aが可視光増感性化合物によって光励起される光開始性を確保する観点と、
化合物Bが可視光増感性を確保する観点とから、少なくとも2個以上のエポキシ基を含有する多官能エポキシ樹脂であり、好ましくは脂肪族又は芳香族の2官能エポキシ樹脂である。
多官能エポキシ樹脂としては、トリメチロールプロパンポリグリシジルエーテル、グリセロールポリグリシジルエーテル、ペンタエリストールポリグシジルエーテル、ソルビトールポリグリシジルエーテル、フェノールノボラック型グリシジルエーテル、クレゾールノボラック型グリシジルエーテル、テトラグリシジルジアミノジフェニルメタン、トリグリシジルアミノフェノール等が挙げられ、
脂肪族の2官能エポキシ樹脂としては、ポリエチレングリコールジグリシジルエーテル、ジエチレングリコールジグリシジルエーテル、ト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、ヘキサンジオールジグリシジルエーテル等が好ましく、
芳香族の2官能エポキシ樹脂としては、ビスフェノールA型ジグリシジルエーテル、ビスフェノールF型ジグリシジルエーテル、ビスフェノールAD型ジグリシジルエーテル、ビフェニル型ジグリシジルエーテル、レゾルシノール型ジグリシジルエーテル等が好ましく挙げられ、中でも、
下記式(5)で表わされるジエチレングリコールジグリシジルエーテルと、下記式(6)で表わされるビスフェノールAジグリシジルエーテルが更に好ましい。
化合物Aは、ジアミノ安息香酸とジエチレングリコールジグリシジルエーテルとを反応させて得られる下記式(1):
ジアミノ安息香酸とビスフェノールAジグリシジルエーテルとが反応して得られる下記式(2):
化合物Bは、ヒドロキシチオキサントンとジエチレングリコールジグリシジルエーテルとを反応させて得られる下記式(3):
ヒドロキシチオキサントンとビスフェノールAジグリシジルエーテルとを反応させて得られる下記式(4):
本発明の光重合開始剤は、
光開始性化合物と可視光増感性化合物とを含む光重合開始剤であって、
光開始性化合物が化合物Aであり、及び/又は、可視光増感性化合物が化合物Bである。
自己開裂型のベンゾイン系化合物、アセトフェノン類、ヒドロキシアセトフェノン類、α-アミノアセトフェノン類、α-アシルオキシムエステル類、アシルホスフィンオキサイド系化合物、アゾ系化合物等を使用でき、
水素引き抜き型のベンゾフェノン類、ベンゾインエーテル類、ベンジルケタール類、ジベンゾスベロン類、アントラキノン類、キサントン類、チオキサントン類、ハロゲノアセトフェノン類、ジアルコキシアセトフェノン類、ヒドロキシアセトフェノン類、ハロゲノビスイミダゾール類、ハロゲノトリアジン類等を使用できる。
本発明の光硬化性樹脂組成物は、光重合性モノマー又はオリゴマーと本発明の光重合開始剤とを含む。
液晶への溶解による汚染を抑制する観点から、
(メタ)アクリル酸エステルモノマー及び/又はこれらのオリゴマー並びに
ビスフェノールA型エポキシ樹脂と(メタ)アクリル酸とを反応して得られる部分(メタ)アクリル化エポキシ樹脂が好ましく、
ビスフェノールA型エポキシ樹脂と(メタ)アクリル酸とを反応して得られる部分(メタ)アクリル化エポキシ樹脂がより好ましい。
好ましくは、2-ヒドロキシエチル(メタ)アクリレート、ジ、トリ又はテトラエチレングリコールジ(メタ)アクリレート、エポキシ変性ジ(メタ)アクリレート、ウレタン変性ジ(メタ)アクリレートであり、
より好ましくは、エポキシ変性ジ(メタ)アクリレート、ウレタン変性ジ(メタ)アクリレートであり、
更に好ましくは、エポキシ変性ジ(メタ)アクリレートである。
まずビスフェノールA型エポキシ樹脂と(メタ)アクリル酸を塩基性触媒、好ましくは3価の有機リン酸化合物及び/又はアミン化合物の存在下で、エポキシ基1当量に対して(メタ)アクリル酸を10~90当量%を反応させる。次いで、この反応生成物を濾過、遠心分離及び/又は水洗等の処理により塩基性触媒を除去して精製する。
塩基性触媒として、エポキシ樹脂と(メタ)アクリル酸との反応により用いられる公知の塩基性触媒を使用することができる。また塩基性触媒をポリマーに担持させた、ポリマー担持塩基性触媒を使用することもできる。
本発明の光硬化性樹脂組成物中、光重合性モノマー又はオリゴマーの含有量は、好ましくは50~90重量%、より好ましくは60~80重量%、更に好ましくは70~80重量%である。
一方、近年、電子部品の配線の高密度化により、特にODF工法が採用される液晶分野では以下の課題が生じている。
このとき、紫外線照射による(メタ)アクリル基の反応が不十分であったり、配線等の影になって紫外線が当たらなかったりすると、熱硬化時に液晶シール剤成分が液晶に流出し、結果として、表示不良を発生させる原因となる。
熱硬化剤としては、低温でも硬化速度が速く、粘度安定性が良好という観点から、
混晶系ヒドラジド化合物、有機酸ジヒドラジド化合物、イミダゾール及びその誘導体、ジシアンジアミド、芳香族アミン、脂肪族アミン及びその誘導体から群から選ばれる少なくとも1つの化合物が好ましく、
ヒドラジド混晶化合物及び/又は有機酸ジヒドラジド化合物がより好ましく、
ヒドラジド系混晶化合物が更に好ましい。
(I)1分子中に少なくとも1個のヒドラジド基を有する結晶性ヒドラジド化合物の2種以上を融点以上に加熱溶融して加熱溶融物を得た後、前記加熱溶融物を冷却して固化して得られ得る化合物であること。
(II)前記化合物のCuKα線によるX線回折スペクトルにおいて、ブラッグ角(2θ±0.2°)の5.5~7.5°に混晶特有の回折ピークを有すること。
本発明においては、融点および熱時反応性、保存安定性の観点から、原料となる結晶性ヒドラジド化合物としては、好ましくは、一般式(1):
レン基又はオキソ基を示す。]で表されるジヒドラジド化合物からなる群から選ばれる2種以上の化合物であり、特開平2010-143872号公報段落0020及び0021に開示されるヒドラジド化合物が好ましい。
好ましくは、シュウ酸ジヒドラジド、マロン酸ジヒドラジド、コハク酸ジヒドラジド、アジピン酸ジヒドラジド、ピメリン酸ジヒドラジド、スベリン酸ジヒドラジド、アゼライン酸ジヒドラジド、セバシン酸ジヒドラジド、ドデンカンニ酸ジヒドラジド、ヘキサデカン二酸ジヒドラジド、イソフタル酸ジヒドラジド、テレフタル酸ジヒドラジド、カルボヒドラジド、マレイン酸ジヒドラジド、フマル酸ジヒドラジド、ジグリコール酸ジヒドラジド、酒石酸ジヒドラジド、リンゴ酸ジヒドラジド、2,6-ナフトエ酸ジヒドラジド、1,4-ナフトエ酸ジヒドラジド、4,4’-ビスベンゼンジヒドラジド、ハイドロキノンジグリコール酸ジヒドラジド、レゾルシノールジグリコール酸ジヒドラジド、カテコールジグリコール酸ジヒドラジド、4,4’-エチリデンビスフェノール-ジグリコール酸ジヒドラジド、4,4’-ビニリデンビスフェノール-ジグリコール酸ジヒドラジドからなる群から選ばれる1種以上の化合物であり、
より好ましくは、シュウ酸ジヒドラジド、マロン酸ジヒドラジド、コハク酸ジヒドラジド、アジピン酸ジヒドラジド、ピメリン酸ジヒドラジド、スベリン酸ジヒドラジド、アゼライン酸ジヒドラジド、セバシン酸ジヒドラジド、ドデンカンニ酸ジヒドラジド、ヘキサデカン二酸ジヒドラジド、イソフタル酸ジヒドラジド、テレフタル酸ジヒドラジドからなる群から選ばれる1種以上の化合物である。
好ましくは、アセトヒドラジド、プロピオン酸ヒドラジド、ペンタン酸ヒドラジド、ラウリル酸ヒドラジド、シクロヘキサンカルボヒドラジド、サリチル酸ヒドラジド、p-ヒドロキシ安息香酸ヒドラジド、ナフトエ酸ヒドラジドからなる群から選ばれる1種以上の化合物であり、
より好ましくは、アセトヒドラジド、プロピオン酸ヒドラジド、ペンタン酸ヒドラジド、ラウリル酸ヒドラジド、シクロヘキサンカルボヒドラジド、サリチル酸ヒドラジドからなる群から選ばれる1種以上の化合物である。
アジピン酸ジヒドラジドとセバシン酸ジヒドラジド、
アジピン酸ジヒドラジドとデカンジオジヒドラジド、
セバシン酸ジヒドラジドとデカンジオジヒドラジドの組合せが好ましい。
光重合性モノマー又はオリゴマー100重量部に対して、
5~50重量部であることが好ましく、5~30重量部であることがより好ましい。
フィラー用無機粒子として、シール剤に好適に用いられる粒子径が得られやすい観点から炭酸カルシウム、炭酸マグネシウム、硫酸バリウム、硫酸マグネシウム、珪酸アルミニウム、酸化チタン、アルミナ、酸化亜鉛、二酸化ケイ素、カオリン、タルク、ガラスビーズ、セリサイト活性白土、ベントナイト、窒化アルミニウム、及び窒化ケイ素からなる群から選ばれる少なくとも1種以上の無機粒子が好ましく、二酸化ケイ素、タルク、アルミナ、ベンナイトからなる群から選ばれる少なくとも1種以上の無機粒子がより好ましく、二酸化ケイ素及び/又はタルクが更に好ましく、二酸化ケイ素が更に好ましい。
フィラー用有機樹脂粒子として、硬化時の応力緩和による接着強度としての添加効果を発現させる観点から、ポリメタクリル酸メチル、ポリスチレン、これらを構成するモノマーと他のモノマーとを共重合させて得られる共重合体、ポリエステル微粒子、ポリウレタン微粒子、ゴム微粒子、及び高いガラス転移温度を有する共重合体を含むシェルと低いガラス転移温度を有する共重合体のコアから構成されるコアシェルタイプ微粒子からなる群から選ばれる少なくとも1種以上の有機樹脂粒子が好ましく、ポリエステル微粒子、ポリウレタン微粒子、ゴム微粒子、及び高いガラス転移温度を有する共重合体を含むシェルと低いガラス転移温度を有する共重合体のコアから構成されるコアシェルタイプ微粒子からなる群から選ばれる少なくとも1種以上の有機樹脂粒子がより好ましく、高いガラス転移温度を有する共重合体を含むシェルと低いガラス転移温度を有する共重合体のコアから構成されるコアシェルタイプ微粒子が更に好ましい。また、コアシェルタイプ微粒子では、高いガラス転移温度を有する共重合体がポリメタクリル酸で、低いガラス転移温度を有する共重合体がブチルアクリレートであることが好ましい。
シランカップリング剤としては、γ-アミノプロピルトリメトキシシシラン、γ-メルカプトプロピルトリメトキシシラン、γ-グリシドキシプロピルトリメトキシシラン、γ-イソシアネートプロピルトリメトキシシランからなる群から選ばれる1種以上の化合物が好ましく、γ-グリシドキシプロピルトリメトキシシランがより好ましい。
デナコールEX-850L(ジエチレングリコールジグリシジルエーテル、ナガセケムテックス株式会社製)13.7g、
4-ジメチルアミノ安息香酸14.8g、
PS-PPh3(ポリスチレン(PS)にトリフェニルホスフィン(PPh3)を担持した塩基性触媒、バイオタージ社製)900mg、
トルエン200mlを混合し110℃で48時間撹拌した。
反応混合物を室温に冷却し、濾過により触媒を除去した。
溶媒を減圧留去しデナコールEX-850Lのアミン付加体を得た。
同定はHPLCにて行い、目的成分が70%以上含まれていることを確認した。
エピクロンEXA-850CRP(ビスフェノールAジグリシジルエーテル、DIC株式会社製)1.70g、
4-ジメチルアミノ安息香酸1.57g、
PS-PPh3(バイオタージ社製)50mg、
トルエン20mlを混合し110℃で48時間撹拌した。
反応混合物を室温に冷却し、濾過により触媒を除去した。
溶媒を減圧留去しエピクロンEXA-850CRPのアミン付加体を得た。
同定はHPLCにて行い、目的成分が70%以上含まれていることを確認した。
デナコールEX-850L(ジエチレングリコールジグリシジルエーテル、ナガセケムテックス株式会社製)13.7g、
ヒドロキシチオキサントン14.8g、
PS-PPh3(バイオタージ社製)900mg、
トルエン200mlを混合し110℃で48時間撹拌した。
反応混合物を室温に冷却し、濾過により触媒を除去した。
溶媒を減圧留去しデナコールEX-850Lのアミン付加体を得た。
同定はHPLCにて行い、目的成分が60%以上含まれていることを確認した。
エピクロンEXA-850CRP(ビスフェノールAジグリシジルエーテル、DIC株式会社製)1.70g、
2-ヒドロキシチオキサンテン-10-オン2.17g、
PS-PPh3(バイオタージ社製)100mg、
PS-TBD(PS上に1,5,7-triazabicyclo[4.4.0]dec-5-eneを担持した固体触媒で塩基性触媒、バイオタージ社製)100mg、
トルエン20mlを混合し110℃で48時間撹拌した。
反応混合物を室温に冷却し、濾過により触媒を除去した。
溶媒を減圧留去しEXA-850CRPのチオキサントン付加体を得た。
同定はHPLCにて行い、目的成分が60%以上含まれていることを確認した。
ビスフェノールA型エポキシ樹脂(EXA850CRP、DIC株式会社製)320.2g、
メタクリル酸(東京化成社製)90.4g、
PS-PPh3(バイオタージ社製)1.5g、及び
BHT100mgを混合し100℃で6時間撹拌した。
反応終了後、濾過により触媒を除去し部分メタクリレート化エポキシ樹脂を得た。
(b)光重合開始剤
分解型(可視光硬化タイプ):イルガキュア、I-369(BASFジャパン社製)
分解型(反応性基含有タイプ):EYレジン、KR-2(ケイエスエム社製)
(c)熱硬化剤(ヒドラジド系混晶化合物)
ADH:アジピン酸ジヒドラジド(大塚化学社製)
C3:混晶系熱硬化剤(協立化学産業社製)
VDH:イソプロピルヒダントイン骨格のジヒドラジド(味の素ファインテクノ社製)
(d)樹脂フィラー:メタブレン、J-5800(三菱レイヨン社製)
(e)無機フィラー:シリカ(シーホスター、KE-C50HG、日本触媒社製、0.5μm)
(f)カップリング剤:KBM403(信越化学工業社製)
光重合性オリゴマーPR-850CRP100重量部(100g)に
光開始性化合物A1が1重量部と可視光増感性化合物B1が1重量部とからなる光重合開始剤を溶解した。
その後、カップリング剤1重量部、無機フィラー10重量部、熱硬化剤15重量部を混合し、3本ロールミル(ロール寸法、φ121×250mm、井上製作所社製)を用いて、圧力5MPa、2パスで充分に混練し硬化性樹脂組成物を得た。
実施例5と同じ条件で、表1に示す実施例6、7及び比較例1~3の配合組成で混合後、3本ロールを用いて充分に混練して各樹脂組成物を得た。
比較例3では、
光開始性化合物として、EHA(製品名:DAROCURE EHA、成分名:2-エチルヘキシル-4-(ジメチルアミノ)ベンゾエイト、BASF社製)を、
光増感性化合物として、DETX(製品名:Photocure DETX、成分名:2,4-ジエチルチオキサントン、EUTEC CHEMICAL社製)を使用した。
光重合性オリゴマーPR-850CRP100重量部(100g)に
光開始性化合物A1が1重量部と可視光増感性化合物B1が1重量部とからなる光重合開始剤を溶解した。
その後、カップリング剤1重量部、有機フィラー10重量部、無機フィラー5重量部、熱硬化剤15重量部を混合し、3本ロールミル(ロール寸法、φ121×250mm、井上製作所社製)を用いて、圧力5MPa、2パスで充分に混練し硬化性樹脂組成物を得た。
実施例8と同じ条件で、表2に示す実施例9~12及び参考例1の配合組成で混合後、3本ロールを用いて充分に混練して各光硬化性樹脂組成物を得た。
(1)加熱減量
示差熱天秤(TG-DTA、製品名:サーモプラスTG8120、リガク社製)を用いて、秤量した各光開始剤をアルミパンに入れ、昇温速度10℃/分で300℃まで昇温した時の減量した割合を測定した。より減少量が大きいほうが、アウトガスとして揮発しやすいことを示しており、揮発量が多くなることで液晶が汚染され、結果として表示不良につながり易くなる。
光硬化性樹脂組成物を、
一方を25mm×25mm厚さ0.7mmのLCD用ガラス、
他方を25mm×25mm厚さ0.1mmのPETフィルムにより、
光硬化性樹脂組成物の厚みが0.5mmになるようにはさみ、
紫外線照射装置(UVX-01224S1、ウシオ電機製)により、100mW/cm2の紫外線照射照度で200~3000mJ/cm2の光エネルギーで照射を行い硬化性測定用のサンプルとした。
このとき、紫外線・熱線カットフィルターを用いて、
(i)波長340nm~450nm及び
(ii)波長420nm~450nmの紫外及び可視光を照射した。
硬化率の測定はFT-IR(Spectrum One、パーキンエルマー社製)を用いて測定し、
得られたIRスペクトルの(メタ)アクリル基のピーク面積より(メタ)アクリル基の反応率(転化率)を算出した。
反応率の算出は(メタ)アクリル基の吸収1630cm-1(又は945cm-1)の面積の減少をベンゼン環の二重結合の吸収1500cm-1の面積を基準として計算した。
TG-DTA(リガク社製)の装置を用いて、120℃×60分間でのアウトガスを測定し、シール剤からの揮発成分量の比較を行い、
揮発成分量が1.5%以下の場合を「○」、
揮発成分量が1.5%以上の場合を「×」
とした。
光硬化性樹脂組成物を、シールディスペンサーを用いて断面積4000μm2で、ラビング処理した配向膜(サンエバーSE-7492、日産化学工業社製)付きITOガラス基板上(60mm×70mm×0.7mmt)にディスペンス塗布した。
その後、基板上に液晶(TN液晶、MLC-11900-080、メルク社製)を滴下し、上下基板を液晶滴下工法(ODF工法)により貼り合わせて、試験用液晶セルを作製した。
試験用液晶セルに、紫外線(UV照射装置:UVX-01224S1、ウシオ電機社製、照度:200mJ:100mW/cm2/365nmで2秒)を照射して硬化させ、
その後120℃の熱風オーブンで1時間熱硬化を行い、配向性試験のための試験用硬化液晶セルを作製した。
得られた試験用硬化液晶セルについて、シール際の液晶の配向状態の確認を行った。
確認は光学顕微鏡で行い、偏光板をクロスニコルの状態でテストセルを挟み透過で観察を行った。
試験用硬化液晶セルのコーナー部の配向状態を示す顕微鏡写真を図1~図6に示す。なお、図1~図6は、いずれも縦900μm×横1200μmのスケールである。
液晶の配向性の評価基準はシール際の配向乱れの有無により判断した。
シール際に配向乱れが50μm以下の場合を「○」、
それ以上の配向乱れがある場合を「×」
とした。
光硬化性樹脂組成物の室温(25℃)での粘度変化を測定し、
五日後の粘度変化が20%以下の場合を「○」、
五日後の粘度変化が20%以上の場合を「×」
で判断した。
粘度の測定は、
光硬化性樹脂組成物が25℃となるように恒温処理し、
RE-105U型粘度計(東機産業社製)に3°×R7.7コーンロータを取り付け、対象となる樹脂組成物0.15mlをコーンロータ内にセットし、2.5rpmで25℃の光硬化性樹脂組成物の粘度を測定した。
測定対象とした作製直後の光硬化性樹脂組成物を25℃で5日間静置し、
5日後の該光硬化性樹脂組成物の粘度を上記方法で測定し、
光硬化性樹脂組成物の作製直後の粘度を初期粘度とし、
初期粘度からの変化率を算出し安定性の評価とした。
測定レンジオーバーした場合は、測定不可とした。なお、測定レンジオーバーの基準は、1,200,000mPa・sである。
測定対象とした光硬化性樹脂組成物の回転式レオメーター(レオストレス300、Haake社製)による粘度が、
熱硬化開始後、
60分以内に飽和粘度まで到達した場合を「◎」、
120分以内に飽和粘度まで到達した場合を「○」
120分でも飽和粘度まで到達しない場合を「×」
で判断した。
粘度の測定は、
測定対象とした光硬化性樹脂組成物を回転式レオメーター(レオストレス300、Haake社製)を用いて120℃における粘度変化を測定した。
パラレルプレートを用いてサンプル量0.6g、ギャップ1mm、ひずみ制御モードで、温度条件は室温から120℃まで20℃/分で昇温し、120℃を保持したまま120分測定を行った。粘度変化が見られなくなった粘度(飽和粘度)に到達した時間を測定した。
シール剤によりアンプルテストを実施し、電圧保持率(VHR)、イオン密度(ID)を測定し評価した。
〔測定用試料の作製〕
アンプル瓶に配合した光硬化性樹脂組成物0.1gを入れ、TN液晶(MLC-11900-080、メルク社製)1gを加える。このアンプル瓶を120℃オーブンに1時間投入し、その後室温で静置して室温(25℃)に戻ってから液晶部分を取り出し0.2μmフィルターによりろ過し、電気特性評価用の液晶サンプルとした。
〔電圧保持率およびイオン密度の測定〕
電気特性評価用の液晶サンプルを用いて電気特性評価用セルを作製した。セルの作製方法は、ラビング処理したTN液晶用配向膜(サンエバーSE-7492、日産化学工業社製)付きITOガラス基板上(55mm×60mm×0.7mmt)に市販のシール剤(ワールドロックNo.717、協立化学産業社製)を枠シール剤として使用し、電気特性評価用の液晶サンプルを基板上に滴下し、上下基板を液晶滴下工法(ODF工法)により貼り合わせて、紫外線(UV照射装置:UVX-01224S1、ウシオ電機社製、照度および照射時間:3000mJ、100mW/cm2/365nmで30秒)を照射して硬化させ、その後120℃の熱風オーブンで1時間熱硬化を行い、電気特性評価のための試験用液晶セルを作製した。
電圧保持率の測定は液晶物性評価装置(6254C、東陽テクニカ社製)を用いて行った。印加電圧5V、60Hz、16msec時の電圧保持率を測定した。測定は50℃で行った。
電気特性の評価基準は電圧保持率の値より判断した。
電圧保持率の値が98%以上の場合を「○」、
電圧保持率の値が98%以下の場合を「×」
とした。
表2に示す配合例で混合後、3本ロールミル(ロール寸法、φ121×250mm、井上製作所社製)を用いて、圧力5MPa、2パスで充分に混練して各光硬化性樹脂組成物(実施例8~12及び参考例1)を得た。こうして得られた光硬化性樹脂組成物を、シールディスペンサーを用いて断面積4000μm2で、ラビング処理した配向膜(サンエバーSE-5662、日産化学工業社製)付き配線パターン(Crによりライン/スペース:200μm/200μm)付きガラス基板上(60mm×70mm×0.7mmt)にディスペンス塗布した。
その後、基板上に液晶(VA液晶、MLC-6609、メルク社製)を滴下し、ギャップを4μmに設定し、上下基板を液晶滴下工法(ODF工法)により貼り合わせて、試験用液晶セルを作製した。
試験用液晶セルに、紫外線(UV照射装置:UVX-01224S1、ウシオ電機社製、照度および照射時間:3000mJ、100mW/cm2/365nmで10秒)を照射して硬化させ、その後120℃の熱風オーブンで1時間熱硬化を行い、配向性試験のための試験用硬化液晶セルを作製した。
得られた試験用硬化液晶セルについて、配線間のシール際の液晶の配向状態の確認を行った。確認は光学顕微鏡で行い、偏光板をクロスニコルの状態でテストセルを挟み透過で観察を行った。試験用硬化液晶セルの配線部分の配向状態を示す顕微鏡写真を図7~図9に示す。なお、図7~図9は、いずれも縦900μm×横1200μmのスケールである。
液晶の配向性の評価基準はシール際の配向乱れの有無により判断した。
シール際に配向乱れが20μm以下の場合を「○」、
それ以上の配向乱れがある場合を「×」
とした。
また、420nmフィルターを使用した場合(特殊な液晶パネルの製造条件、今後の主流になる可能性有り)、従来の光開始剤である比較例2では、シール剤の硬化が進行せず、液晶パネルの信頼性に問題があることがわかった。
以上のことから、本発明の化合物A1、A2、B1及びB2、この化合物を使用した光重合開始剤及び光硬化性樹脂組成物は、滴下工法用の液晶シール剤の光開始剤としての有用性が高いことがわかる。
上記結果(表2)により、本発明の化合物A1、A2、B1及びB2にさらに熱硬化性化合物を加え、さらに、熱硬化性化合物がヒドラジド系混晶化合物である場合、これらの化合物を使用した光重合開始剤及び光硬化性樹脂組成物は、高品位の液晶パネルの製造に有用な液晶シール剤として使用できることが明らかとなった。
Claims (9)
- 有機酸化合物および/またはヒドロキシ化合物と分子中に少なくとも2個のエポキシ基を含有する化合物とを反応させて得られる化合物であって、前記化合物が、
前記有機酸化合物がジメチルアミノ安息香酸である化合物A、又は、
前記ヒドロキシ化合物がヒドロキシチオキサントンである化合物Bである化合物。 - 光開始性化合物と可視光増感性化合物とからなる光重合開始剤であって、
前記光開始性化合物が前記化合物Aであり、
前記可視光増感性化合物が前記化合物Bである光重合開始剤。 - 光重合性モノマー又はオリゴマーと請求項6記載の光重合開始剤とを含む光硬化性樹脂組成物。
- さらに、熱硬化性化合物を含む請求項7記載の光硬化性樹脂組成物。
- 前記熱硬化性化合物が、ヒドラジド系混晶化合物である請求項8記載の光硬化性樹脂組成物。
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Also Published As
Publication number | Publication date |
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JP6125603B2 (ja) | 2017-05-10 |
KR101845646B1 (ko) | 2018-04-04 |
JP2016121347A (ja) | 2016-07-07 |
TW201237048A (en) | 2012-09-16 |
KR20160086966A (ko) | 2016-07-20 |
JP5886758B2 (ja) | 2016-03-16 |
KR20130125788A (ko) | 2013-11-19 |
TWI561539B (ja) | 2016-12-11 |
CN103249713A (zh) | 2013-08-14 |
JPWO2012077720A1 (ja) | 2014-05-22 |
CN103249713B (zh) | 2015-09-09 |
KR101672580B1 (ko) | 2016-11-03 |
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