JP6273103B2 - 偏光板用接着剤組成物 - Google Patents
偏光板用接着剤組成物 Download PDFInfo
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- JP6273103B2 JP6273103B2 JP2013143028A JP2013143028A JP6273103B2 JP 6273103 B2 JP6273103 B2 JP 6273103B2 JP 2013143028 A JP2013143028 A JP 2013143028A JP 2013143028 A JP2013143028 A JP 2013143028A JP 6273103 B2 JP6273103 B2 JP 6273103B2
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- 230000001070 adhesive effect Effects 0.000 title claims description 77
- 239000000203 mixture Substances 0.000 title claims description 65
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 103
- 239000000178 monomer Substances 0.000 claims description 52
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- 125000003700 epoxy group Chemical group 0.000 claims description 32
- 150000001875 compounds Chemical class 0.000 claims description 27
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- 125000000524 functional group Chemical group 0.000 claims description 17
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 15
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003504 photosensitizing agent Substances 0.000 claims description 15
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 14
- 239000003999 initiator Substances 0.000 claims description 13
- 125000000623 heterocyclic group Chemical group 0.000 claims description 8
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 8
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 7
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- 125000003118 aryl group Chemical group 0.000 claims description 6
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- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 claims description 4
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- LWNGJAHMBMVCJR-UHFFFAOYSA-N (2,3,4,5,6-pentafluorophenoxy)boronic acid Chemical compound OB(O)OC1=C(F)C(F)=C(F)C(F)=C1F LWNGJAHMBMVCJR-UHFFFAOYSA-N 0.000 description 4
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 4
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- 125000003647 acryloyl group Chemical group O=C([*])C([H])=C([H])[H] 0.000 description 4
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- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
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- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
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- 229920003319 Araldite® Polymers 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical group C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
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- 125000005073 adamantyl group Chemical group C12(CC3CC(CC(C1)C3)C2)* 0.000 description 3
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- 239000012965 benzophenone Substances 0.000 description 3
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- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
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- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 3
- XUVKSPPGPPFPQN-UHFFFAOYSA-N 10-Methyl-9(10H)-acridone Chemical compound C1=CC=C2N(C)C3=CC=CC=C3C(=O)C2=C1 XUVKSPPGPPFPQN-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
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- 125000004200 2-methoxyethyl group Chemical group [H]C([H])([H])OC([H])([H])C([H])([H])* 0.000 description 2
- NJWGQARXZDRHCD-UHFFFAOYSA-N 2-methylanthraquinone Chemical compound C1=CC=C2C(=O)C3=CC(C)=CC=C3C(=O)C2=C1 NJWGQARXZDRHCD-UHFFFAOYSA-N 0.000 description 2
- VVBLNCFGVYUYGU-UHFFFAOYSA-N 4,4'-Bis(dimethylamino)benzophenone Chemical compound C1=CC(N(C)C)=CC=C1C(=O)C1=CC=C(N(C)C)C=C1 VVBLNCFGVYUYGU-UHFFFAOYSA-N 0.000 description 2
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- FYYIUODUDSPAJQ-XVBQNVSMSA-N [(1S,6R)-7-oxabicyclo[4.1.0]heptan-3-yl]methyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC1CC[C@H]2O[C@H]2C1 FYYIUODUDSPAJQ-XVBQNVSMSA-N 0.000 description 2
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- 125000004998 naphthylethyl group Chemical group C1(=CC=CC2=CC=CC=C12)CC* 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000003518 norbornenyl group Chemical group C12(C=CC(CC1)C2)* 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- MPQXHAGKBWFSNV-UHFFFAOYSA-N oxidophosphanium Chemical class [PH3]=O MPQXHAGKBWFSNV-UHFFFAOYSA-N 0.000 description 1
- AFEQENGXSMURHA-UHFFFAOYSA-N oxiran-2-ylmethanamine Chemical compound NCC1CO1 AFEQENGXSMURHA-UHFFFAOYSA-N 0.000 description 1
- 125000005440 p-toluyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C(*)=O)C([H])([H])[H] 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QNGNSVIICDLXHT-UHFFFAOYSA-N para-ethylbenzaldehyde Natural products CCC1=CC=C(C=O)C=C1 QNGNSVIICDLXHT-UHFFFAOYSA-N 0.000 description 1
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 125000000286 phenylethyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 125000004193 piperazinyl group Chemical group 0.000 description 1
- 125000003386 piperidinyl group Chemical group 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 150000003220 pyrenes Chemical class 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- BUUPQKDIAURBJP-UHFFFAOYSA-N sulfinic acid Chemical compound OS=O BUUPQKDIAURBJP-UHFFFAOYSA-N 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- MUTNCGKQJGXKEM-UHFFFAOYSA-N tamibarotene Chemical compound C=1C=C2C(C)(C)CCC(C)(C)C2=CC=1NC(=O)C1=CC=C(C(O)=O)C=C1 MUTNCGKQJGXKEM-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- XBFJAVXCNXDMBH-UHFFFAOYSA-N tetracyclo[6.2.1.1(3,6).0(2,7)]dodec-4-ene Chemical compound C1C(C23)C=CC1C3C1CC2CC1 XBFJAVXCNXDMBH-UHFFFAOYSA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000005628 tolylene group Chemical group 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- LALRXNPLTWZJIJ-UHFFFAOYSA-N triethylborane Chemical compound CCB(CC)CC LALRXNPLTWZJIJ-UHFFFAOYSA-N 0.000 description 1
- MKOBNHWWZPEDQJ-UHFFFAOYSA-N trifluoro(methanidylsulfonyl)methane Chemical compound [CH2-]S(=O)(=O)C(F)(F)F MKOBNHWWZPEDQJ-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- 239000012953 triphenylsulfonium Substances 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 125000006839 xylylene group Chemical group 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
本発明の第一の態様は、本発明は、(A)重合性官能基含有マクロモノマー 0.5〜30質量部と;(B)エポキシ基含有化合物 40〜99.5質量部と;(C)その他のモノマー 0〜59.5質量部と;(D)光酸発生剤と;(E)光重合開始剤および光増感剤の少なくとも一方と;を含む、偏光板用接着剤組成物である。「偏光板用接着剤組成物」を、以下単に「組成物」とも称する。
本発明は、(A)重合性官能基含有マクロモノマー 0.5〜30質量部と;(B)エポキシ基含有化合物 40〜99.5質量部と;(C)その他のモノマー 0〜59.5質量部と;(D)光酸発生剤と;(E)光重合開始剤および光増感剤の少なくとも一方と;を含む、偏光板用接着剤組成物である。この偏光板用接着剤組成物のうち(A)〜(C)が重合性成分である。なお、本明細書において、(メタ)アクリレートの記載は、アクリレートまたはメタクリレートを意味する。
本発明に係る重合性官能基含有マクロモノマー(本明細書中、単に「マクロモノマー」とも称する)は、重合可能な官能基(不飽和基)を有する高分子量のモノマーであり、ポリマー鎖部分と、重合性官能基部分とからなる。
本発明で用いられるエポキシ基含有化合物としては、エポキシ基を含有する化合物であれば特に制限はなく、1分子中、少なくとも1個のエポキシ基を含有する化合物であればよい。また(B)エポキシ基含有化合物は、(メタ)アクリレート部位(アクリロイル基)を有していることも好ましい。より具体的には、(B)エポキシ基含有化合物としては、1分子中に1個のエポキシ基を含有する(メタ)アクリレートや、1分子中に2個のエポキシ基を含有するエポキシ樹脂などが好適である。
本発明の偏光板用接着剤組成物は、成分(A)と成分(B)とは必須成分として含むが、これら以外のモノマー(その他のモノマー)を含んでもよい。ところで、成分(B)としてエポキシ基含有(メタ)アクリレートモノマーを含まず、エポキシ樹脂のみを含む場合は、下記で列挙するようなその他のモノマーを含むことが特に好ましい。その理由としては、エポキシ樹脂は一般に粘度が高いので、粘度の低いその他のモノマーを含むことで、接着剤溶液の粘度を低くするため、また、各種フィルムへの濡れ性を上げるためである。なお、その他のモノマーは2種類以上を併用してもよい。
光酸発生剤は光を照射すると強酸を発生させるものであり、強酸がエポキシ基含有化合物を攻撃し、エポキシ基含有(メタ)アクリレートモノマーの重合が開始される。光酸発生剤としては、従来公知の光酸発生剤を特に制限なく使用できる。具体的には、例えば、芳香族ジアゾニウム塩、芳香族ヨードニウム塩や芳香族スルホニウム塩などのオニウム塩、鉄−アレン錯体などが挙げられる。これらは、単独でもまたは2種以上を組み合わせて使用してもよい。
本発明の接着剤組成物は、さらに、光重合開始剤および光増感剤の少なくとも一方を含む。光重合開始剤としては特に制限はなく、従来公知の光重合開始剤を好ましく使用できる。光重合開始剤は、単独でもまたは2種以上を組み合わせて使用してもよい。
本発明の接着剤組成物を製造するには、特に制限はなく、通常は、上記の成分を混合して接着剤組成物が得られる。粘度調整のために適宜有機溶媒を使用してもよい。混合方法にも特に制限はなく、室温(25℃)で、液体内が均一になるまで十分に攪拌混合すればよい。
本発明の第二の態様によれば、本発明の偏光板用接着剤組成物を用いて接着した、保護フィルムと、偏光子とを備える偏光板が提供される。本発明の偏光板は、製造時の工程性に優れ、十分な接着性を示す。以下、本発明の偏光板の構成について説明する。
偏光子としては、特に制限はなく、従来公知のものを使用できる。例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料等の二色性材料を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。
保護フィルムとしては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れる材料が好ましい。例えば、セルロースジアセテート、セルローストリアセテート等のセルロース系樹脂、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂、ポリメチルメタクリレート等のアクリル系樹脂、ポリスチレンやアクリロニトリル・スチレン共重合体(AS樹脂)等のスチレン系樹脂、ポリカーボネート系樹脂、ポリエチレン、ポリプロピレン、シクロ系ないしはノルボルネン構造を有するポリオレフィン、エチレン・プロピレン共重合体等のポリオレフィン系樹脂、塩化ビニル系樹脂、ナイロンや芳香族ポリアミド等のアミド系樹脂、イミド系樹脂、スルホン系樹脂、ポリエーテルスルホン系樹脂、ポリエーテルエーテルケトン系樹脂、ポリフェニレンスルフィド系樹脂、ビニルアルコール系樹脂、塩化ビニリデン系樹脂、ビニルブチラール系樹脂、アリレート系樹脂、ポリオキシメチレン系樹脂、エポキシ系樹脂、または前記樹脂のブレンドなどが挙げられる。
偏光板の製造方法としては特に制限はなく、従来公知の方法によって、保護フィルムと偏光子とを、本発明の接着剤組成物を用いて貼り合わせることによって製造し得る。塗布した接着剤組成物は、紫外線照射により接着性を発現して接着層を構成する。
表1に示される成分を、表1に示される配合量に従って、23℃、相対湿度50%RHの恒温室内で、目視で均一になるまで攪拌混合し、実施例1〜15および比較例1〜5の接着剤組成物を得た。なお、表1中の単位は「g」である。
偏光子は、以下の方法で作製した。平均重合度2400、ケン化度99.9%の厚み75μmのポリビニルアルコールフィルムを、28℃の温水中に90秒間浸漬し膨潤させ、次いで、ヨウ素/ヨウ化カリウム(重量比2/3)の濃度0.6重量%の水溶液に浸漬し、2.1倍に延伸させながらポリビニルアルコールフィルムを染色した。その後、60℃のホウ酸エステル水溶液中で合計の延伸倍率が5.8倍となるように延伸を行い、水洗、45℃で3分乾燥を行い、偏光子(厚み25μm)を作製した。
実施例1〜15および比較例1〜5で作製した紫外線照射直後の偏光板を、図2に示すように、折り曲げた偏光板8の間隔が10mmとなるように(R10mm)折り曲げ、保護フィルムの剥離があるかないかを目視で判定した。剥離が観察されなかった場合は○、観察された場合は×とした。評価結果を下記表1に示す。
実施例1〜15および比較例1〜5で作製した偏光板を、トムソン刃で50mm×50mmの大きさに裁断し、裁断の際の端部の剥がれの状態を目視で観察した。評価基準としては、0.5mm以下を合格とした。評価結果を表1に示す。好ましい結果は、0.3mm以下であり、より好ましくは0.2mm以下であり、特に好ましくは0mmである。
実施例1〜15および比較例1〜5で作製した偏光板を、トムソン刃で50mm×50mmの大きさに裁断し、60℃の水槽に浸漬し、2時間保持した。その後、水槽から各サンプルを取り出し、偏光子の収縮の大きさを測定した。図3(A)に示すように、試験前の偏光板8の端部から、図3(B)に示すように、延伸方向に収縮した偏光板8の端部までを測定し、収縮の大きさ9とした。接着剤の接着性が高ければより収縮は小さく、接着性が十分でなければ偏光板の収縮はより大きい値となる。評価基準としては、収縮の大きさが1.0mm未満を合格とした。評価結果を表1に示す。好ましい結果は、0.5mm以下であり、より好ましくは0.2mm以下であり、特に好ましくは0mmである。
図4は、本実施例で剥離強度測定用試料の製造方法を示す概略図である。図4に示すように上記のように得られた接着剤組成物2を、PETフィルム10とアクリルフィルム11の間にスポイトによって適量滴下し、ロール6、7を備えるロールプレスによって貼り合わせた。なお、PETフィルムとアクリルフィルムはそれぞれの接着剤面をコロナ処理した。
2 接着剤組成物溶液、
3、4 保護フィルム、
5 紫外線照射前偏光板、
6、7 ロール、
8 偏光板、
9 収縮の大きさ、
10 PETフィルム、
11 アクリルフィルム、
12 剥離強度測定用試料。
Claims (6)
- (A)重合性官能基含有マクロモノマー 0.5〜30質量部と;
(B)エポキシ基含有化合物 40〜99.5質量部と;
(C)その他のモノマー 0〜59.5質量部と;
(D)光酸発生剤と;
(E)光重合開始剤および光増感剤の少なくとも一方と;
を含み、
前記重合性官能基含有マクロモノマーにおける、重合性官能基が、エチレン性不飽和二重結合であり、マクロモノマーを構成するポリマー鎖部分が、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n−ブチル(メタ)アクリレート、i−ブチル(メタ)アクリレート、t−ブチル(メタ)アクリレート、スチレン、アクリロニトリル、ヒドロキシ(メタ)アクリレートまたはエチルヘキシルアクリレートから誘導される繰り返し単位を主構成単位とする(共)重合体であり、
前記(C)成分は、前記(A)成分および(B)成分とは異なる、偏光板用接着剤組成物。 - 前記(A)成分が、8〜15質量部である、請求項1に記載の偏光板用接着剤組成物。
- 前記(C)成分が、ヒドロキシ基含有(メタ)アクリレートモノマー、芳香族環含有(メタ)アクリレートモノマー、脂環含有(メタ)アクリレートモノマーまたは複素環含有(メタ)アクリレートモノマーである、請求項1または2に記載の偏光板用接着剤組成物。
- 前記重合性官能基含有マクロモノマーの数平均分子量(Mn)が、4000〜8000の範囲内である、請求項1〜3のいずれか1項に記載の偏光板用接着剤組成物。
- 請求項1〜4のいずれか1項に記載の偏光板用接着剤組成物を用いて接着した、保護フィルムと偏光子とを備える偏光板。
- 前記保護フィルムが、アクリルフィルムである、請求項5に記載の偏光板。
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