CN117801719A - Optical adhesive sheet and optical film with adhesive layer - Google Patents
Optical adhesive sheet and optical film with adhesive layer Download PDFInfo
- Publication number
- CN117801719A CN117801719A CN202311247567.4A CN202311247567A CN117801719A CN 117801719 A CN117801719 A CN 117801719A CN 202311247567 A CN202311247567 A CN 202311247567A CN 117801719 A CN117801719 A CN 117801719A
- Authority
- CN
- China
- Prior art keywords
- adhesive sheet
- adhesive layer
- optical
- release liner
- less
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000853 adhesive Substances 0.000 title claims abstract description 173
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 173
- 239000012790 adhesive layer Substances 0.000 title claims abstract description 133
- 230000003287 optical effect Effects 0.000 title claims abstract description 75
- 239000012788 optical film Substances 0.000 title claims abstract description 61
- 239000010408 film Substances 0.000 description 69
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 38
- 239000000178 monomer Substances 0.000 description 38
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 36
- 238000005259 measurement Methods 0.000 description 34
- 238000000034 method Methods 0.000 description 34
- 239000011248 coating agent Substances 0.000 description 25
- 238000000576 coating method Methods 0.000 description 25
- 238000012545 processing Methods 0.000 description 22
- 238000006073 displacement reaction Methods 0.000 description 20
- 229920005601 base polymer Polymers 0.000 description 19
- 239000000203 mixture Substances 0.000 description 19
- 239000010410 layer Substances 0.000 description 17
- -1 2-ethylhexyl Chemical group 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 238000007373 indentation Methods 0.000 description 14
- 229920000058 polyacrylate Polymers 0.000 description 14
- 238000006116 polymerization reaction Methods 0.000 description 14
- 230000009477 glass transition Effects 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 12
- 239000003431 cross linking reagent Substances 0.000 description 11
- 238000003825 pressing Methods 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 10
- 238000005520 cutting process Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000009832 plasma treatment Methods 0.000 description 8
- 125000000217 alkyl group Chemical group 0.000 description 7
- 230000001681 protective effect Effects 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 238000003754 machining Methods 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 6
- 229920001519 homopolymer Polymers 0.000 description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920002799 BoPET Polymers 0.000 description 4
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- MPIAGWXWVAHQBB-UHFFFAOYSA-N [3-prop-2-enoyloxy-2-[[3-prop-2-enoyloxy-2,2-bis(prop-2-enoyloxymethyl)propoxy]methyl]-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(COC(=O)C=C)(COC(=O)C=C)COCC(COC(=O)C=C)(COC(=O)C=C)COC(=O)C=C MPIAGWXWVAHQBB-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 239000006059 cover glass Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 239000003999 initiator Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 2
- NDWUBGAGUCISDV-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate Chemical compound OCCCCOC(=O)C=C NDWUBGAGUCISDV-UHFFFAOYSA-N 0.000 description 2
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 239000006087 Silane Coupling Agent Substances 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000007607 die coating method Methods 0.000 description 2
- 125000003438 dodecyl group Chemical group [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])* 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 238000010528 free radical solution polymerization reaction Methods 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 229920001477 hydrophilic polymer Polymers 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 150000004291 polyenes Chemical class 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920006254 polymer film Polymers 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 2
- OZFIGURLAJSLIR-UHFFFAOYSA-N 1-ethenyl-2h-pyridine Chemical compound C=CN1CC=CC=C1 OZFIGURLAJSLIR-UHFFFAOYSA-N 0.000 description 1
- LNKDTZRRFHHCCV-UHFFFAOYSA-N 1-ethenyl-2h-pyrimidine Chemical compound C=CN1CN=CC=C1 LNKDTZRRFHHCCV-UHFFFAOYSA-N 0.000 description 1
- OSSNTDFYBPYIEC-UHFFFAOYSA-N 1-ethenylimidazole Chemical compound C=CN1C=CN=C1 OSSNTDFYBPYIEC-UHFFFAOYSA-N 0.000 description 1
- DCRYNQTXGUTACA-UHFFFAOYSA-N 1-ethenylpiperazine Chemical compound C=CN1CCNCC1 DCRYNQTXGUTACA-UHFFFAOYSA-N 0.000 description 1
- PBGPBHYPCGDFEZ-UHFFFAOYSA-N 1-ethenylpiperidin-2-one Chemical compound C=CN1CCCCC1=O PBGPBHYPCGDFEZ-UHFFFAOYSA-N 0.000 description 1
- CTXUTPWZJZHRJC-UHFFFAOYSA-N 1-ethenylpyrrole Chemical compound C=CN1C=CC=C1 CTXUTPWZJZHRJC-UHFFFAOYSA-N 0.000 description 1
- DGPVNNMFVYYVDF-UHFFFAOYSA-N 1-prop-2-enoylpyrrolidin-2-one Chemical compound C=CC(=O)N1CCCC1=O DGPVNNMFVYYVDF-UHFFFAOYSA-N 0.000 description 1
- TXBCBTDQIULDIA-UHFFFAOYSA-N 2-[[3-hydroxy-2,2-bis(hydroxymethyl)propoxy]methyl]-2-(hydroxymethyl)propane-1,3-diol Chemical compound OCC(CO)(CO)COCC(CO)(CO)CO TXBCBTDQIULDIA-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- BSQQSDPTDVETTH-UHFFFAOYSA-N 3-ethenyl-1-methylpyrrolidin-2-one Chemical compound CN1CCC(C=C)C1=O BSQQSDPTDVETTH-UHFFFAOYSA-N 0.000 description 1
- SXIFAEWFOJETOA-UHFFFAOYSA-N 4-hydroxy-butyl Chemical group [CH2]CCCO SXIFAEWFOJETOA-UHFFFAOYSA-N 0.000 description 1
- YKXAYLPDMSGWEV-UHFFFAOYSA-N 4-hydroxybutyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCO YKXAYLPDMSGWEV-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- 229920000106 Liquid crystal polymer Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 238000007754 air knife coating Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000012662 bulk polymerization Methods 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 125000002704 decyl group Chemical group [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])* 0.000 description 1
- 238000007033 dehydrochlorination reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- XXMIOPMDWAUFGU-UHFFFAOYSA-N hexane-1,6-diol Chemical compound OCCCCCCO XXMIOPMDWAUFGU-UHFFFAOYSA-N 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000001421 myristyl 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])[H] 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 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
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920006290 polyethylene naphthalate film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 229920001289 polyvinyl ether Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 238000012719 thermal polymerization Methods 0.000 description 1
- 125000002948 undecyl 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])[H] 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- 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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
-
- 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
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- 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
-
- 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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
- C09J7/403—Adhesives in the form of films or foils characterised by release liners characterised by the structure of the release feature
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
Abstract
The present invention relates to an optical adhesive sheet and an optical film with an adhesive layer. The present invention provides an optical adhesive sheet suitable for ensuring the level difference absorbability of the end portions and an optical film with an adhesive layer having such an optical adhesive sheet as an adhesive layer. The adhesive sheet (10) of the present invention is an optical adhesive sheet having a main region (11) and a soft end (12) softer than the main region (11). The ratio of the second press-fitting elastic modulus at 25 ℃ of the soft end portion (12) to the first press-fitting elastic modulus at 25 ℃ of the main region portion (11) is 0.85 or less.
Description
Technical Field
The present invention relates to an optical adhesive sheet and an optical film with an adhesive layer.
Background
The display panel has, for example, a laminated structure including elements such as a pixel panel, a polarizing film, a touch panel, and a cover glass. In the manufacturing process of such a display panel, in order to join elements included in the laminated structure to each other, for example, an optically transparent adhesive sheet (optical adhesive sheet) is used.
On the other hand, development of a display panel that is repeatedly bendable (foldable), for example, for a smart phone and a tablet terminal is underway. In particular, the foldable display panel is capable of repeatedly deforming between a curved shape and a flat non-curved shape. In such a foldable display panel, each element in the laminated structure is made to be bendable repeatedly, and a thin optical adhesive sheet is used for bonding between such elements. An optical pressure-sensitive adhesive sheet for flexible devices such as a foldable display panel is described in, for example, patent document 1 below.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2018-111754
Disclosure of Invention
Problems to be solved by the invention
A colored printing layer for decoration or shading is provided on the edge (front end) of the side surface of the pixel panel of the cover glass for the smart phone and the tablet computer terminal. The printed layer is provided, for example, on the entire circumference of the edge of the cover glass. The printed layer has a prescribed thickness. Therefore, there is a difference in height (print height) between the surface of the protective glass and the surface of the print layer on the pixel panel side of the protective glass. In the pressure-sensitive adhesive sheet having a protective glass as an adherend, in addition to the reliability of the bonding between adherends, flexibility (level difference absorbency) sufficient to be able to follow the print level difference is required. The difference in level absorbency of the pressure-sensitive adhesive sheet is unsatisfactory because it is insufficient to cause formation of bubbles along the printed layer between the pressure-sensitive adhesive sheet attached to the surface of the protective glass on the side of the pixel panel with the printed layer and the protective glass.
The present invention provides an optical adhesive sheet suitable for ensuring the level difference absorbability of the end portions and an optical film with an adhesive layer having such an optical adhesive sheet as an adhesive layer.
Means for solving the problems
The invention [1] comprises an optical adhesive sheet comprising a main region and a soft end portion softer than the main region, wherein the ratio of the second press-in elastic modulus at 25 ℃ of the soft end portion to the first press-in elastic modulus at 25 ℃ of the main region is 0.85 or less.
The invention [2] includes the optical adhesive sheet of [1], wherein the ratio of the second press-in elastic modulus to the first press-in elastic modulus is 0.5 or more.
The invention [3] comprises the optical adhesive sheet according to the above [1] or [2], wherein the second press-in elastic modulus is 110kPa or less.
The invention [4] comprises the optical adhesive sheet according to any one of [1] to [3], wherein the second press-in elastic modulus is 50kPa or more.
The invention [5] comprises the optical adhesive sheet according to any one of [1] to [4], wherein the first press-in elastic modulus is 150kPa or less.
The invention [6] includes the optical adhesive sheet according to any one of [1] to [5], wherein a length from an outer end to an inner end of the soft end in a plane direction of the optical adhesive sheet is 50 μm or more and 500 μm or less.
The invention [7] includes the optical adhesive sheet according to any one of [1] to [6], wherein the soft end portion has a side end face inclined at an angle of 20 ° to 50 ° inclusive with respect to the thickness direction of the optical adhesive sheet.
The invention [8] comprises an optical film with an adhesive layer, wherein the optical film with an adhesive layer has: an optical film, and an adhesive layer formed of the optical adhesive sheet according to any one of the above [1] to [7] on the optical film.
Effects of the invention
As described above, the optical adhesive sheet of the present invention has a soft end portion softer than the main region portion, and the ratio of the second press-in elastic modulus at 25 ℃ of the soft end portion to the first press-in elastic modulus at 25 ℃ of the main region portion is 0.85 or less. Such a configuration is suitable for securing the level difference absorbability at the end portion of the optical adhesive sheet. The optical film with an adhesive layer having such an optical adhesive sheet as an adhesive layer is suitable for securing the level difference absorbability of the end portion of the adhesive layer.
Drawings
Fig. 1 is a schematic cross-sectional view of an embodiment of the optical adhesive sheet of the present invention.
Fig. 2 is an enlarged partial cross-sectional view of an end portion of the optical adhesive sheet shown in fig. 1.
Fig. 3 shows a method for manufacturing the optical adhesive sheet shown in fig. 1. Fig. 3A shows a laminate manufacturing process, fig. 3B shows a first contour machining process, fig. 3C shows a removal process, and fig. 3D shows a second contour machining process.
Fig. 4 is a schematic cross-sectional view of one embodiment of an optical film with an adhesive layer of the present invention.
Fig. 5 is an enlarged partial cross-sectional view of an end portion of the optical film with an adhesive layer shown in fig. 4.
Description of the reference numerals
10. Adhesive sheet (optical adhesive sheet)
H thickness direction
Direction of D plane
10a first side
10b second side
11. Main area part
12. Soft end
13. Side end face
20. Release liner (first release liner)
30. Release liner (second release liner)
X optical film with adhesive layer
10A adhesive layer (first adhesive layer)
10B adhesive layer (second adhesive layer)
40 optical film
Detailed Description
As shown in fig. 1 and 2, the pressure-sensitive adhesive sheet 10 according to an embodiment of the present invention has a sheet shape having a predetermined thickness and extends in a direction (plane direction D) orthogonal to the thickness direction H. The pressure-sensitive adhesive sheet 10 has a second surface 10b on the opposite side of the first surface 10a from the first surface 10 a. Fig. 1 exemplarily shows a state in which release liners 20, 30 are attached to both surfaces of an adhesive sheet 10. The release liner 20 is in releasable contact with the first face 10a of the adhesive sheet 10. The release liner 30 is in releasable contact with the second face 10b.
The adhesive sheet 10 is an optically transparent adhesive sheet (optical adhesive sheet) disposed at a light passing portion in a flexible device. As the flexible device, for example, a flexible display panel can be cited. The flexible display panel has, for example, a laminated structure including elements such as a pixel panel, a polarizing film, a phase difference film, a touch panel, and protective glass. The adhesive sheet 10 is used for joining elements included in a laminated structure to each other, for example, in a manufacturing process of a flexible display panel. The release liners 20 and 30 are peeled off at predetermined timings when the adhesive sheet 10 is used.
The adhesive sheet 10 has a main region 11 and a soft end 12. The soft end portion 12 is softer than the main area portion 11. In the present embodiment, the pressure-sensitive adhesive sheet 10 has a soft end 12 over the entire periphery of the edge of the sheet in plan view. The soft end portion 12 has a side end surface 13. That is, the adhesive sheet 10 has side end faces 13. The side end surfaces 13 define the top-view outer contour shape of the adhesive sheet 10.
From the viewpoint of securing the adhesive force of the soft end portion 12 by suppressing the decrease in the adhesive force of the soft end portion 12 compared with the main region portion 11, the ratio (E2/E1) of the press-in elastic modulus E2 (second press-in elastic modulus) at 25 ℃ of the soft end portion 12 to the press-in elastic modulus E1 (first press-in elastic modulus) at 25 ℃ of the main region portion 11 is preferably 0.5 or more, more preferably 0.6 or more, still more preferably 0.7 or more, still more preferably 0.75 or more (the smaller the press-in elastic modulus is on the surface of the adhesive sheet, the smaller the adhesive force is). From the viewpoint of achieving good level difference absorbency at the end of the adhesive sheet 10, the ratio (E2/E1) is 0.85 or less, preferably 0.8 or less, more preferably 0.75 or less, and even more preferably 0.65 or less. The indentation elastic modulus is the elastic modulus measured by nanoindentation.
Nanoindentation is a method for measuring various objects of a sample on a nanometer scaleA sexual technique. In this embodiment, nanoindentation is performed according to ISO 14577. In the nanoindentation method, a process of pressing a indenter into a specimen placed on a stage (load applying process) and a process of thereafter extracting the indenter from the specimen (load removing process) are performed, and a load acting between the indenter and the specimen and a relative displacement of the indenter with respect to the specimen in a series of processes are measured (load-displacement measurement). Thus, a load-displacement curve can be obtained. From this load-displacement curve, various physical properties (hardness, elastic modulus, and the like) measured on a nanometer scale can be obtained for the measurement sample. For the load-displacement measurement by nanoindentation, for example, a nanoindenter (trade name "trinoindenor", manufactured by Hysitron corporation) can be used. In this measurement, the measurement mode was set to a single press-in measurement, the measurement temperature was set to 25 ℃, a Berkovich (triangular pyramid) type diamond indenter (diameter 20 μm) was used as the indenter, the maximum press-in depth (maximum displacement hmax) of the indenter with respect to the measurement sample during load application was set to 4 μm, the press-in speed of the indenter was set to 1000 nm/sec, and the pull-out speed of the indenter from the measurement sample during load removal was set to 1000 nm/sec. The resulting assay data were then processed by dedicated analysis software (ver.9.4.0.1) of "TI950 triboindanter". Specifically, based on the obtained load (f) -displacement (h) curve, the maximum load fmax (load acting on the indenter at the maximum displacement hmax), the contact projected area S (projected area of the contact area between the indenter and the specimen at the time of the maximum load), and the slope D of the tangent line of the load-displacement curve at the time of the start of the load removal process are obtained. Then, the indentation elastic modulus (= (pi) was calculated from the slope D and the contact projection area S 1/2 D)/(2S 1/2 )). The method for measuring the indentation elastic modulus is more specifically described later with respect to examples.
From the viewpoint of ensuring flexibility required for the pressure-sensitive adhesive sheet for flexible equipment use in the pressure-sensitive adhesive sheet 10, the pressing elastic modulus E1 of the main region 11 is preferably 150kPa or less, more preferably 140kPa or less, and still more preferably 135kPa or less. The press-in elastic modulus E1 is preferably 115kPa or more, more preferably 120kPa or more, and even more preferably 125kPa or more, from the viewpoint of ensuring a good adhesive force in the main region 11 and ensuring an adhesive function of the adhesive sheet 10. Examples of the method for adjusting the press-in elastic modulus E1 include selection of the type of the base polymer in the adhesive sheet 10, adjustment of the molecular weight, and adjustment of the blending amount.
From the viewpoint of achieving good level difference absorbency at the end portion of the adhesive sheet 10, the indentation elastic modulus E2 of the soft end portion 12 is preferably 110kPa or less, more preferably 105kPa or less, still more preferably 100kPa or less, still more preferably 95kPa or less, still more preferably 90kPa or less, and particularly preferably 85kPa or less. From the viewpoint of securing the adhesive force of the soft end portion 12, the press-in elastic modulus E2 is preferably 50kPa or more, more preferably 60kPa or more, still more preferably 70kPa or more, and particularly preferably 80kPa or more. Examples of the method for adjusting the press-in elastic modulus E2 include selection of the type of the base polymer in the adhesive sheet 10, adjustment of the molecular weight, and adjustment of the blending amount. As a method for adjusting the press-fit elastic modulus E2, there is also mentioned adjustment of laser irradiation conditions in laser processing described later. Examples of the laser irradiation conditions include: the wavelength of the laser, the pulse width of the laser, the frequency of the pulse, the laser output power, and the spot diameter of the laser beam.
As described above, the adhesive sheet 10 has the soft end portion 12 softer than the main region portion 11, and the ratio (E2/E1) of the press-in elastic modulus E2 at 25 ℃ of the soft end portion 12 to the press-in elastic modulus E1 at 25 ℃ of the main region portion 11 is 0.85 or less. As described above, a ratio (E2/E1) of 0.85 or less is suitable for securing the level difference absorbency at the end portion of the adhesive sheet 10. In the pressure-sensitive adhesive sheet 10, the ratio (E2/E1) of the press-in elastic modulus E2 to the press-in elastic modulus E1 is preferably 0.5 or more as described above. As described above, a ratio (E2/E1) of 0.5 or more is suitable for securing adhesive force at the end of the adhesive sheet 10. Such an adhesive sheet 10 is suitable for both the adhesive force at the end portion and the differential absorption property.
From the viewpoint of ensuring good level difference absorbency of the end portions in the adhesive sheet 10, the length L from the outer end 12a to the inner end 12b of the soft end portion 12 (the length in the direction perpendicular to the side end face 13 in the plane view of the adhesive sheet 10) in the surface direction D of the adhesive sheet 10 is preferably 50 μm or more, more preferably 70 μm or more, still more preferably 80 μm or more, and particularly preferably 90 μm or more. In addition, from the viewpoint of securing a wide main region 11 in the adhesive sheet 10, the length L is preferably 500 μm or less, more preferably 400 μm or less, further preferably 300 μm or less, and particularly preferably 260 μm or less. The method of measuring the length L of the soft end portion 12 is as described later with respect to the examples. As a method for adjusting the length L of the soft end portion 12, for example, adjustment of the laser irradiation conditions in laser processing described later (the same applies to lengths L1 and L2 described later) is exemplified. Examples of the laser irradiation conditions include: the wavelength of the laser, the pulse width of the laser, the frequency of the pulse, the laser output power, and the spot diameter of the laser beam.
The side end face 13 is inclined with respect to the thickness direction H of the adhesive sheet 10. The inclination angle α of the side end face 13 with respect to the thickness direction H is preferably 20 ° or more, more preferably 25 ° or more, still more preferably 30 ° or more, and particularly preferably 35 ° or more from the viewpoint of ensuring alignment accuracy when the adhesive sheet 10 is attached to an adherend (the side end face 13 may be used as an alignment mark at the time of attachment). The inclination angle α is preferably 50 ° or less, more preferably 45 ° or less, and even more preferably 40 ° or less, from the viewpoint of ensuring the quality of the visual field region in the pressure-sensitive adhesive sheet 10 after being bonded to the adherend. The method of measuring the inclination angle of the side end face 13 is as described later with respect to the embodiment. As a method for adjusting the inclination angle α, for example, adjustment of a laser irradiation condition in laser processing described later can be cited. Examples of the laser irradiation conditions include a wavelength of laser light, a pulse width of laser light, a frequency of the pulse, a laser output, and a spot diameter of a laser beam.
The adhesive sheet 10 is formed of an adhesive composition. The adhesive composition comprises a base polymer. The base polymer is an adhesive component exhibiting adhesiveness. Examples of the base polymer include: acrylic polymers, polyurethane polymers, polyamide polymers, and polyvinyl ether polymers. The base polymer may be used alone, or two or more kinds may be used in combination. From the viewpoint of ensuring good transparency and adhesion in the adhesive sheet 10, an acrylic polymer is preferably used as the base polymer.
The acrylic polymer is a copolymer containing a monomer component of a (meth) acrylic acid ester in a proportion of 50 mass% or more. "(meth) acrylic" refers to acrylic and/or methacrylic. As the (meth) acrylic acid ester, an alkyl (meth) acrylate is preferably used, and an alkyl (meth) acrylate having 1 to 20 carbon atoms as an alkyl group is more preferably used.
Examples of the alkyl (meth) acrylate include: methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, pentyl (meth) acrylate, n-hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, isodecyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (i.e., lauryl (meth) acrylate, isotridecyl (meth) acrylate, and tetradecyl (meth) acrylate. The alkyl (meth) acrylate is preferably at least one selected from the group consisting of 2-ethylhexyl acrylate (2 EHA), lauryl Acrylate (LA) and n-butyl acrylate. The proportion of the alkyl (meth) acrylate in the monomer component is preferably 50% by mass or more, more preferably 70% by mass or more, further preferably 90% by mass or more, and, for example, 99% by mass or less, from the viewpoint of appropriately exhibiting basic characteristics such as adhesiveness in the adhesive sheet 10.
The monomer component may comprise a copolymerizable monomer capable of copolymerizing with the alkyl (meth) acrylate. Examples of the copolymerizable monomer include monomers having a polar group. Examples of the polar group-containing monomer include: hydroxyl group-containing monomers, carboxyl group-containing monomers, and monomers having a nitrogen atom-containing ring. The polar group-containing monomer contributes to the introduction of crosslinking points into the acrylic polymer and ensures the modification of the acrylic polymer such as the cohesive force of the acrylic polymer.
Examples of the hydroxyl group-containing monomer include: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate. As the hydroxyl group-containing monomer, at least one selected from the group consisting of 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 4-hydroxybutyl acrylate and 4-hydroxybutyl methacrylate is preferably used. The proportion of the hydroxyl group-containing monomer in the monomer component is preferably 1% by mass or more, more preferably 2% by mass or more, and still more preferably 3% by mass or more, from the viewpoints of introducing a crosslinked structure into the acrylic polymer and securing cohesive force in the adhesive sheet 10. From the viewpoint of adjusting the polarity of the acrylic polymer (regarding the compatibility of various additive components in the adhesive sheet 10 with the acrylic polymer), this ratio is preferably 20 mass% or less, more preferably 10 mass% or less.
Examples of the monomer having a nitrogen atom-containing ring include: n-vinyl-2-pyrrolidone, N-methyl vinyl pyrrolidone, N-vinyl pyridine, N-vinyl piperidone, N-vinyl pyrimidine, N-vinyl piperazine, N-vinyl pyrrole, N-vinyl imidazole, and N- (meth) acryl-2-pyrrolidone. As the monomer having a nitrogen atom-containing ring, N-vinyl-2-pyrrolidone is preferably used. The proportion of the monomer having a nitrogen atom-containing ring in the monomer component is preferably 0.1 mass% or more, more preferably 0.5 mass% or more, and even more preferably 1 mass% or more, from the viewpoint of securing the cohesive force in the adhesive sheet 10 and securing the adhesion force to the adherend in the adhesive sheet 10. From the viewpoints of adjusting the glass transition temperature of the acrylic polymer and adjusting the polarity of the acrylic polymer (regarding the compatibility of various additive components in the adhesive sheet 10 with the acrylic polymer), the ratio is preferably 30 mass% or less, more preferably 20 mass% or less.
The base polymer preferably has a crosslinked structure. As a method for introducing a crosslinked structure into a base polymer, the following first method and second method can be cited. In the first method, a base polymer having a functional group capable of reacting with a crosslinking agent and the crosslinking agent are blended into an adhesive composition, and the base polymer and the crosslinking agent are reacted in an adhesive layer. In the second method, a polyfunctional monomer as a crosslinking agent is contained in a monomer component forming the base polymer, and the base polymer having a branched structure (crosslinked structure) incorporated in a polymer chain is formed by polymerization of the monomer component. These methods may be used in combination.
Examples of the crosslinking agent used in the first method include compounds that react with functional groups (e.g., hydroxyl groups and carboxyl groups) contained in the base polymer. Examples of such a crosslinking agent include an isocyanate crosslinking agent, a peroxide crosslinking agent, and an epoxy crosslinking agent. The crosslinking agent may be used alone, or two or more thereof may be used in combination.
In the above-described second method, the monomer component (including the polyfunctional monomer for introducing a crosslinked structure and other monomers) may be polymerized at one time or may be polymerized in multiple steps. In the multi-step polymerization method, first, a monofunctional monomer used for forming a base polymer is polymerized (prepolymerized), thereby producing a prepolymer composition containing a part of a polymer (a mixture of a polymer having a low degree of polymerization and an unreacted monomer). Next, a polyfunctional monomer as a crosslinking agent is added to the prepolymer composition, and then a part of the polymer is polymerized with the polyfunctional monomer (main polymerization). Examples of the polyfunctional monomer include polyfunctional (meth) acrylates having two or more ethylenically unsaturated double bonds in one molecule. As the polyfunctional monomer, a polyfunctional acrylate is preferable from the viewpoint that a crosslinked structure can be introduced by active energy ray polymerization (photopolymerization). Examples of the polyfunctional (meth) acrylate include: ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, 1, 6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate and dipentaerythritol hexa (meth) acrylate. As the polyfunctional (meth) acrylate, dipentaerythritol hexaacrylate (DPHA) is preferably used.
The acrylic polymer may be formed by polymerizing the above monomer components. Examples of the polymerization method include: solution polymerization, photopolymerization without solvent (e.g., UV polymerization), bulk polymerization, and emulsion polymerization. As the solvent for the solution polymerization, for example, ethyl acetate and toluene can be used. As the initiator for polymerization, for example, a thermal polymerization initiator or a photopolymerization initiator can be used.
The weight average molecular weight of the base polymer is preferably 10 ten thousand or more, more preferably 30 ten thousand or more, and still more preferably 50 ten thousand or more, from the viewpoint of securing the cohesive force of the adhesive sheet 10. The weight average molecular weight is preferably 500 ten thousand or less, more preferably 300 ten thousand or less, and still more preferably 200 ten thousand or less. The weight average molecular weight of the base polymer was measured by Gel Permeation Chromatography (GPC), and calculated by polystyrene conversion.
From the viewpoint of ensuring the flexibility of the adhesive sheet 10, the glass transition temperature (Tg) of the base polymer is preferably 0 ℃ or less, more preferably-10 ℃ or less, and still more preferably-20 ℃ or less. The glass transition temperature is, for example, at least-80 ℃.
As for the glass transition temperature (Tg) of the base polymer, a glass transition temperature (theoretical value) obtained based on the following Fox formula can be used. The Fox equation is a relation between the glass transition temperature Tg of a polymer and the glass transition temperature Tgi of a homopolymer of monomers constituting the polymer. In the following Fox formula, tg represents the glass transition temperature (. Degree. C.) of the polymer, wi represents the weight fraction of the monomer i constituting the polymer, tgi represents the glass transition temperature (. Degree. C.) of the homopolymer formed from the monomer i. As regards the glass transition temperature of the homopolymer, literature values can be used. Examples include: glass transition temperatures of various homopolymers in Polymer handbook (fourth edition, john Wiley & Sons Inc., 1999). On the other hand, the glass transition temperature of the homopolymer of the monomer can be determined by a method specifically described in Japanese patent application laid-open No. 2007-51271.
Fox equation 1/(273+tg) =Σ [ Wi/(273+tgi) ]
The adhesive composition may contain other components as needed. Examples of the other components include: solvents, silane coupling agents, ultraviolet absorbers, tackifiers, softeners, and antioxidants. Examples of the solvent include a polymerization solvent used when polymerizing an acrylic polymer, if necessary, and a solvent added to a polymerization reaction solution after polymerization. As the solvent, for example, ethyl acetate and toluene can be used.
The haze of the pressure-sensitive adhesive sheet 10 is preferably 3% or less, more preferably 2% or less, and still more preferably 1% or less. The haze of the pressure-sensitive adhesive sheet 10 can be measured by a haze meter according to JIS K7136 (year 2000). Examples of the haze meter include "NDH 2000" manufactured by Nippon electric color industry Co., ltd and "HM-150" manufactured by Country color technology research Co., ltd.
Examples of the material of the release liner 20 include: polyesters, polyolefins, polycarbonates and polyimides. Examples of the polyester include: polyethylene terephthalate, polyethylene naphthalate and polybutylene terephthalate. Examples of the polyolefin include: polyethylene, polypropylene and Cyclic Olefin Polymers (COP). The thickness of the release liner 20 is preferably 5 μm or more, more preferably 10 μm or more, and the thickness of the release liner 20 is preferably 200 μm or less, more preferably 150 μm or less. The release surface 21 of the release liner 20 (the surface on the side of the adhesive sheet 10) is preferably subjected to a release treatment. Examples of the release treatment include a silicone release treatment and a fluorine-containing release treatment (the same applies to the release treatment described later).
In the present embodiment, the release liner 20 has an extended end portion 20A. The extension end portion 20A extends outward of the adhesive sheet 10 in the plane direction D. The extension length of the extension end portion 20A in the plane direction D is, for example, greater than 0mm, and 50mm or less. In the present embodiment, the release liner 20 has a half groove 22 along the side end face 13 of the adhesive sheet 10 on the release surface 21 side. The half groove 22 has a depth in the thickness direction H. The half groove 22 has an inner wall surface 22a (first inner wall surface), an inner wall surface 22b (second inner wall surface), and a round bottom 22c as shown in fig. 2. The inner wall surface 22a is disposed on the inner side (the pressure-sensitive adhesive sheet 10 side) in the surface direction D of the half groove 22. The inner wall surface 22a is flush with the side end surface 13 of the adhesive sheet 10. The inner wall surface 22b is disposed outside the half groove 22 in the surface direction D. The inner wall surface 22b is distant from the inner wall surface 22a in the surface direction D, and faces the inner wall surface 22a in the surface direction D. The rounded bottom 22c is disposed between the inner wall surfaces 22a, 22b in the plane direction D. In a cross section (fig. 2) in a direction orthogonal to the extending direction of the half groove 22 extending along the side end face 13 in a plan view, the rounded bottom 22c has an expanded curved shape, for example, a radius of curvature of 1 μm or more.
Examples of the material of the release liner 30 include those described above for the release liner 20. The thickness of the release liner 30 is preferably 5 μm or more, more preferably 10 μm or more, and the thickness of the release liner 30 is preferably 200 μm or less, more preferably 150 μm or less. The release surface 31 (surface on the side of the adhesive sheet 10) of the release liner 30 is preferably subjected to a release treatment.
The release liner 30 has side end faces 32. In the present embodiment, the side end face 32 is inclined. The side end face 32 is preferably flush with the side end face 13 of the adhesive sheet 10. The inclination angle of the side end surface 13 with respect to the thickness direction H is preferably 20 ° or more, more preferably 25 ° or more, still more preferably 30 ° or more, particularly preferably 35 ° or more, and is preferably 50 ° or less, more preferably 45 ° or less, still more preferably 40 ° or less, as is the inclination angle α of the side end surface 13 of the adhesive sheet 10. The inclination angle of the side end face 32 may be the same as or different from the inclination angle α of the side end face 13.
The adhesive sheet 10 can be manufactured, for example, as follows.
First, as shown in fig. 3A, a long laminated sheet Z is produced (laminated sheet producing step). The laminate Z has a long-sized release liner 102, an adhesive layer 101, and a long-sized release liner 103 in this order in the thickness direction H. The laminate Z can be manufactured, for example, as follows: the adhesive composition is applied to the release liner 102 to form a coating film, the release liner 103 is attached to the coating film, and the coating film is dried and irradiated with light as necessary. Examples of the method for applying the adhesive composition include: roll coating, roll licking coating, gravure coating, reverse coating, roll brushing, spray coating, dip roll coating, bar coating, knife coating, air knife coating, curtain coating, lip die coating, and die coating. The drying temperature of the coating film is, for example, 50 to 200 ℃. The drying time is, for example, 5 seconds to 20 minutes.
Next, as shown in fig. 3B, the pressure-sensitive adhesive layer 101 on the release liner 102 is subjected to laser processing, whereby the pressure-sensitive adhesive sheet 10 having a predetermined planar shape is formed (first contour processing step). Specifically, the adhesive layer 101 on the release liner 102 and the release liner 103 are cut by irradiating the laminate Z with a laser beam in the thickness direction H from the release liner 103 side along a predetermined cutting line of the laminate Z. Thus, the pressure-sensitive adhesive sheet 10 having a predetermined planar shape is formed in the pressure-sensitive adhesive layer 101, the peripheral portion 101a (first peripheral portion) is formed around the pressure-sensitive adhesive sheet 10, the release liner 30 is formed in the release liner 103, and the peripheral portion 103a (second peripheral portion) is formed around the release liner 30.
Examples of the laser beam for laser beam machining include: gas laser, solid laser, and semiconductor laser. Examples of the gas laser include excimer laser and CO 2 Laser (9.4 μm) (the values in brackets indicate the wavelength of the laser, and the same applies to the laser, hereinafter). Examples of the excimer laser include: f (F) 2 Excimer laser (157 nm), arF excimer laser (193 nm), krF excimer laser (248 nm), and XeCl excimer laser (308 nm). Examples of the solid-state laser include: nd: YAG laser (1064 nm), nd: second harmonic (532 nm) of YAG laser, nd: third harmonic (355 nm) of YAG laser and Nd: the fourth harmonic (266 nm) of the YAG laser. Examples of the semiconductor laser include a semiconductor laser having a wavelength of 405 nm. In laser processing, the pulse width of the irradiated laser beam is, for example, 0.5 to 50. Mu.s, the frequency of the pulse is, for example, 1 to 200kHz, the laser output power is, for example, 2 to 250W, and the spot diameter of the laser beam is, for example, 50 to 500. Mu.m.
Next, as shown in fig. 3C, the peripheral portions 101a, 103a (fig. 3B) are removed from the release liner 102 (removal step).
Next, as shown in fig. 3D, the long release liner 102 is cut into a Shan Zhangzhuang (one-piece) release liner 20 (second shaping process). Examples of the cutting method include cutting by irradiation with a laser beam and cutting by punching.
The adhesive sheet 10 with the release liners 20, 30 can be manufactured by the above operation.
Fig. 4 and 5 show an optical film X with an adhesive layer as an embodiment of the present invention. Fig. 4 is a schematic cross-sectional view of an optical film X with an adhesive layer. Fig. 5 is an enlarged partial cross-sectional view of an end portion of an optical film with an adhesive layer.
The optical film X with the adhesive layer has a sheet shape of a predetermined thickness, and spreads in a direction (plane direction D) orthogonal to the thickness direction H. The adhesive layer-carrying optical film X has an adhesive layer 10A, an optical film 40, and an adhesive layer 10B in this order in the thickness direction H. The optical film 40 has a first surface 41 and a second surface 42 opposite to the first surface 41. The adhesive layer 10A is disposed on the first face 41. The adhesive layer 10B is disposed on the second face 42. Fig. 4 and 5 exemplarily show a state in which release liners 20 and 30 are attached to both surfaces (adhesive layers 10A and 10B) of an optical film X with an adhesive layer. The release liner 20 is in releasable contact with the adhesive layer 10A. The release liner 30 is in releasable contact with the adhesive layer 10B. Such an optical film X with an adhesive layer is disposed at a light passing portion in a flexible device such as a flexible display panel. The optical film X with the adhesive layer is used as a supply material of the optical film 40 in the manufacturing process of the flexible device. The release liners 20 and 30 are peeled off at predetermined timings when the optical film X with an adhesive layer is used.
The adhesive layer 10A is an adhesive layer formed of the adhesive sheet 10 described above. The pressure-sensitive adhesive layer 10A has a first surface 10A and a second surface 10b opposite to the first surface 10A, as described above with respect to the pressure-sensitive adhesive sheet 10. The adhesive layer 10A has a main region 11 and a soft end 12. The soft end portion 12 is softer than the main area portion 11. In the present embodiment, the adhesive layer 10A has a soft end 12 over the entire periphery of the edge of the adhesive layer-attached optical film X in plan view. The soft end portion 12 has a side end surface 13. That is, the adhesive layer 10A has the side end face 13. The side end face 13 defines the top-view outer contour shape of the adhesive layer 10A.
From the viewpoint of securing the adhesive force of the soft end portion 12 by suppressing the decrease in the adhesive force of the soft end portion 12 as compared with the main region portion 11, the ratio (E2/E1) of the press-in elastic modulus E2 at 25 ℃ of the adhesive layer 10A to the press-in elastic modulus E1 at 25 ℃ of the adhesive layer 10A is preferably 0.5 or more, more preferably 0.6 or more, still more preferably 0.7 or more, still more preferably 0.75 or more. From the viewpoint of achieving good level difference absorbency at the end of the adhesive layer 10A, the ratio (E2/E1) is 0.85 or less, preferably 0.8 or less, more preferably 0.75 or less, and even more preferably 0.65 or less.
In the pressure-sensitive adhesive layer 10A, the value of the pressing elastic modulus E1 at 25 ℃ of the main region 11 is the same as the value of the pressing elastic modulus E1 described above with respect to the pressure-sensitive adhesive sheet 10. In the pressure-sensitive adhesive layer 10A, the value of the press-in elastic modulus E2 at 25 ℃ of the soft end portion 12 is the same as the value of the press-in elastic modulus E2 described above with respect to the pressure-sensitive adhesive sheet 10.
From the viewpoint of ensuring good level difference absorbency of the end portions in the adhesive layer 10A, the length L1 from the outer end 12a to the inner end 12b of the soft end portion 12 (the length in the direction perpendicular to the side end face 13 in the plan view of the adhesive layer 10A) in the face direction D of the adhesive layer 10A is preferably 50 μm or more, more preferably 70 μm or more, still more preferably 80 μm or more, and particularly preferably 90 μm or more. In addition, from the viewpoint of securing a wide main region 11 in the adhesive layer 10A, the length L1 is preferably 500 μm or less, more preferably 400 μm or less, still more preferably 300 μm or less, and particularly preferably 260 μm or less.
The side end face 13 of the adhesive layer 10A is inclined with respect to the thickness direction H. The inclination angle α of the side end face 13 of the adhesive layer 10A with respect to the thickness direction H is the same as the inclination angle α described above with respect to the adhesive sheet 10.
The adhesive layer 10B is an adhesive layer formed of the adhesive sheet 10 described above. The pressure-sensitive adhesive layer 10B has a first surface 10a and a second surface 10B opposite to the first surface 10a, as described above with respect to the pressure-sensitive adhesive sheet 10. The adhesive layer 10B has a main region 11 and a soft end 12. The soft end portion 12 is softer than the main area portion 11. In the present embodiment, the adhesive layer 10B has a soft end 12 over the entire periphery of the edge of the adhesive layer-attached optical film X in plan view. The soft end portion 12 has a side end surface 13. That is, the adhesive layer 10B has the side end face 13. The side end face 13 defines the top-view outer contour shape of the adhesive layer 10B.
From the viewpoint of securing the adhesive force of the soft end portion 12 by suppressing the decrease in the adhesive force of the soft end portion 12 as compared with the main region portion 11, the ratio (E2/E1) of the press-in elastic modulus E2 at 25 ℃ of the adhesive layer 10B to the press-in elastic modulus E1 at 25 ℃ of the adhesive layer 10B is preferably 0.5 or more, more preferably 0.6 or more, still more preferably 0.7 or more, still more preferably 0.75 or more. From the viewpoint of achieving good level difference absorbency at the end of the adhesive layer 10B, the ratio (E2/E1) is 0.85 or less, preferably 0.8 or less, more preferably 0.75 or less, and even more preferably 0.65 or less. The ratio (E2/E1) of the adhesive layer 10B may be the same as or different from the ratio (E2/E1) of the adhesive layer 10A.
In the pressure-sensitive adhesive layer 10B, the value of the pressing elastic modulus E1 at 25 ℃ of the main region 11 is the same as the value of the pressing elastic modulus E1 described above with respect to the pressure-sensitive adhesive sheet 10. The pressing elastic modulus E1 of the adhesive layer 10B may be the same as or different from the pressing elastic modulus E1 of the adhesive layer 10A. In the pressure-sensitive adhesive layer 10B, the value of the press-in elastic modulus E2 at 25 ℃ of the soft end portion 12 is the same as the value of the press-in elastic modulus E2 described above with respect to the pressure-sensitive adhesive sheet 10. The pressing elastic modulus E2 of the adhesive layer 10B may be the same as or different from the pressing elastic modulus E2 of the adhesive layer 10A.
From the viewpoint of ensuring good level difference absorbency of the end portion in the adhesive layer 10B, the length L2 from the outer end 12a to the inner end 12B of the soft end portion 12 (the length in the direction perpendicular to the side end face 13 in the plan view of the adhesive layer 10B) in the face direction D of the adhesive layer 10B is preferably 50 μm or more, more preferably 70 μm or more, still more preferably 80 μm or more, and particularly preferably 90 μm or more. In addition, from the viewpoint of securing a wide main region 11 in the adhesive layer 10B, the length L2 is preferably 500 μm or less, more preferably 400 μm or less, still more preferably 300 μm or less, and particularly preferably 260 μm or less. The length L2 of the adhesive layer 10B may be the same as or different from the length L1 of the adhesive layer 10A.
The side end face 13 of the adhesive layer 10B is inclined with respect to the thickness direction H. The inclination angle α of the side end face 13 of the adhesive layer 10B with respect to the thickness direction H is the same as the inclination angle α described above with respect to the adhesive sheet 10. The inclination angle α of the side end face 13 of the adhesive layer 10B may be the same as or different from the inclination angle α of the side end face 13 of the adhesive layer 10A.
The release liner 20 is in releasable contact with the first face 10A of the adhesive layer 10A. In the present embodiment, the release liner 20 has the side end face 23 but does not have the above-described extending end portion 20A. In the present embodiment, the side end surface 23 is inclined with respect to the thickness direction H. The side end face 23 is preferably in a plane with the side end face 13 of the adhesive layer 10A. The inclination angle of the side end surface 23 with respect to the thickness direction H is preferably 20 ° or more, more preferably 25 ° or more, still more preferably 30 ° or more, particularly preferably 35 ° or more, and is preferably 50 ° or less, more preferably 45 ° or less, still more preferably 40 ° or less, as is the inclination angle α of the side end surface 13 of the adhesive layer 10A. The inclination angle of the side end face 23 of the release liner 20 may be the same as or different from the inclination angle α of the side end face 13 of the adhesive layer 10A. The other constitution of the release liner 20 is the same as that of the release liner 20 described above with respect to the adhesive sheet 10.
The release liner 30 is in releasable contact with the second face 10B of the adhesive layer 10B. The release liner 30 has side end faces 32. In the present embodiment, the side end face 32 is inclined with respect to the thickness direction H. The side end face 32 is preferably flush with the side end face 13 of the adhesive layer 10B. The inclination angle of the side end face 32 with respect to the thickness direction H is preferably 20 ° or more, more preferably 25 ° or more, still more preferably 30 ° or more, particularly preferably 35 ° or more, and is preferably 50 ° or less, more preferably 45 ° or less, still more preferably 40 ° or less, as is the inclination angle α of the side end face 13 of the adhesive layer 10B. The inclination angle of the side end face 32 of the release liner 30 may be the same as or different from the inclination angle α of the side end face 13 of the adhesive layer 10B. The other constitution of the release liner 30 is the same as that of the release liner 30 described above with respect to the adhesive sheet 10.
The optical film 40 is, for example, a functional optical film. Examples of the functional optical film include: film-like polarizing plates (polarizing films), phase difference films, and combinations thereof. In the case where the optical film 40 is a polarizing film, the optical film X with an adhesive layer is a polarizing film with an adhesive layer. In the case where the optical film 40 is a retardation film, the optical film X with an adhesive layer is a retardation film with an adhesive layer.
Examples of the polarizing film include a hydrophilic polymer film obtained by dyeing with a dichroic substance and a stretching treatment thereafter. Examples of the dichroic substance include iodine and a dichroic dye. Examples of the hydrophilic polymer film include: polyvinyl alcohol (PVA) films, partially formalized PVA films, and partially saponified films of ethylene-vinyl acetate copolymers. As the polarizing film, a polyene oriented film can also be cited. Examples of the material of the polyene oriented film include: a dehydrated product of PVA and a dehydrochlorination product of polyvinyl chloride. The polarizing film may have a protective film bonded to one face and/or the other face in the thickness direction by an adhesive. The thickness of the polarizing film is preferably 1 μm or more, more preferably 5 μm or more, from the viewpoint of securing the function and strength of the polarizing film. The thickness of the polarizing film is preferably 50 μm or less, more preferably 35 μm or less, from the viewpoint of thinning the optical film X with an adhesive layer.
Examples of the retardation film include a λ/2 wavelength film, a λ/4 wavelength film, and a viewing angle compensation film. Examples of the material of the retardation film include a polymer film which is birefringent by a stretching treatment. Examples of the polymer film include a cellulose film and a polyester film. Examples of the cellulose film include triacetyl cellulose films. Examples of the polyester film include: polyethylene terephthalate films, polyethylene naphthalate films, and polybutylene terephthalate films. The retardation film may be a film having a substrate such as a cellulose film and an alignment layer of a liquid crystal compound such as a liquid crystalline polymer on the substrate. The thickness of the retardation film is preferably 1 μm or more, more preferably 2 μm or more, from the viewpoint of securing the function and strength of the retardation film. The thickness of the retardation film is preferably 50 μm or less, more preferably 40 μm or less, from the viewpoint of thinning the optical film X with the pressure-sensitive adhesive layer.
The optical film 40 has side end faces 43. In the present embodiment, the side end surface 43 is inclined with respect to the thickness direction H. The side end face 43 is preferably flush with the side end face 13 of the adhesive layer 10A and/or the side end face 13 of the adhesive layer 10B. The inclination angle of the side end surface 43 with respect to the thickness direction H is preferably 20 ° or more, more preferably 25 ° or more, further preferably 30 ° or more, particularly preferably 35 ° or more, and is preferably 50 ° or less, more preferably 45 ° or less, further preferably 40 ° or less, similarly to the inclination angle α of the side end surface 13. The inclination angle of the side end surface 43 of the optical film 40 may be the same as or different from the inclination angle α of the side end surface 13.
In the optical film X with an adhesive layer, the adhesive layer 10A has the soft end portion 12 softer than the main region portion 11 as described above, and the ratio (E2/E1) of the press-in elastic modulus E2 at 25 ℃ of the soft end portion 12 to the press-in elastic modulus E1 at 25 ℃ of the main region portion 11 is preferably 0.5 or more and 0.85 or less. The ratio (E2/E1) of 0.5 or more is suitable for securing adhesion at the end of the adhesive layer 10A as described above. The ratio (E2/E1) of 0.85 or less is suitable for securing the level difference absorbency at the end of the adhesive layer 10A as described above. Therefore, the adhesive layer 10A is suitable for both the adhesive force at the end portion and the differential absorption property.
In the optical film X with an adhesive layer, the adhesive layer 10B has the soft end portion 12 softer than the main region portion 11 as described above, and the ratio (E2/E1) of the press-in elastic modulus E2 at 25 ℃ of the soft end portion 12 to the press-in elastic modulus E1 at 25 ℃ of the main region portion 11 is preferably 0.5 or more and 0.85 or less. The ratio (E2/E1) of 0.5 or more is suitable for securing adhesion at the end of the adhesive layer 10B as described above. The ratio (E2/E1) of 0.85 or less is suitable for securing the level difference absorbency at the end of the adhesive layer 10B as described above. Therefore, the adhesive layer 10B is suitable for both the adhesive force at the end portion and the differential absorption property.
The optical film X with the adhesive layer can be manufactured, for example, as follows.
The adhesive composition described above with respect to the adhesive sheet 10 is coated on the release treated surface of the first release liner to form a coating film. Then, the release treated surface of the second release liner was bonded to the coating film on the first release liner. Then, ultraviolet rays are irradiated to the coating film between the first release liner and the second release liner to cure the coating film by ultraviolet rays. Thereby obtaining a first adhesive sheet with a first release liner and a second release liner.
On the other hand, the adhesive composition described above with respect to the adhesive sheet 10 is coated on the release treated surface of the third release liner to form a coating film. Then, the release treated surface of the fourth release liner was bonded to the coating film on the third release liner. Then, the coating film between the third release liner and the fourth release liner is irradiated with ultraviolet rays to cure the coating film by ultraviolet rays. Thereby, a second adhesive sheet with a third release liner and a fourth release liner was obtained.
Then, the second release liner is peeled from the first adhesive sheet with the first release liner and the second release liner, and then the exposed surface of the first adhesive sheet exposed by the peeling is subjected to plasma treatment. In addition, the first surface 41 and the second surface 42 of the optical film 40 are also subjected to plasma treatment. Then, the exposed surface of the first adhesive sheet is bonded to the first surface 41 of the optical film 40. Thereby forming the adhesive layer 10A on the first face 41 of the optical film 40.
Then, the fourth release liner is peeled from the second adhesive sheet with the third release liner and the fourth release liner, and then the exposed surface of the second adhesive sheet exposed by the peeling is subjected to plasma treatment. Then, the exposed surface of the second adhesive sheet is bonded to the second surface 42 of the optical film 40. Thereby, the adhesive layer 10B is formed on the second surface 42 of the optical film 40, and a laminate sheet is obtained as a raw material sheet of the optical film X with the adhesive layer.
Next, the laminate is subjected to contour processing (contour processing step). Specifically, the laminate sheet is cut into a predetermined planar shape by irradiating the laminate sheet in the thickness direction along a predetermined cutting line of the laminate sheet with a laser beam. The laser beam may be the same as the laser beam in the first outline processing step described above with reference to fig. 3B.
The optical film X with an adhesive layer can be manufactured by the above operation.
Examples
Hereinafter, the present invention will be specifically described with reference to examples. However, the present invention is not limited to the examples. The specific values of the blending amount (content), physical property value, parameter and the like described below may be replaced with the upper limit (defined as a value of "below" or "less than") or the lower limit (defined as a value of "above" or "greater than") of the blending amount (content), physical property value, parameter and the like corresponding to those described in the above-described "specific embodiment".
Example 1
< preparation of adhesive composition >
First, a mixture containing 75 parts by mass of 2-ethylhexyl acrylate (2 EHA), 10 parts by mass of 4-hydroxybutyl acrylate (4 HBA), 15 parts by mass of N-vinyl-2-pyrrolidone (NVP), and 0.015 part by mass of a photopolymerization initiator (trade name "Omnirad 184", manufactured by IGM Resins corporation) was irradiated with ultraviolet light (polymerization reaction), thereby obtaining a prepolymer composition (polymerization rate about 10%) (the prepolymer composition contains a monomer component which has not undergone polymerization reaction). Next, 100 parts by mass of the prepolymer composition, 0.08 parts by mass of dipentaerythritol hexaacrylate (DPHA) as a polyfunctional acrylate monomer, and 0.3 parts by mass of a silane coupling agent (trade name "KBM-403", 3-glycidoxypropyl trimethoxysilane, manufactured by the company of the shiny chemical industry) were mixed, thereby obtaining an adhesive composition.
< fabrication of laminate >
First, the adhesive composition was applied to the release treated surface of the release liner L1 as the first release liner to form a coating film. The release liner L1 was a polyethylene terephthalate (PET) film (trade name "Diafoil MRV75", thickness 75 μm, manufactured by Mitsubishi chemical Co., ltd.) having one side subjected to silicone release treatmentAnd (5) manufacturing). Next, the release treated surface of the release liner L2 as the second release liner was bonded to the coating film on the release liner L1. The release liner L2 was a PET film (trade name "Diafoil MRV75", thickness 75 μm, manufactured by mitsubishi chemical company) having one side subjected to silicone release treatment. Subsequently, the coating film was irradiated with ultraviolet light through the release liner L2 to cure the coating film with ultraviolet light, thereby forming an optical adhesive sheet having a thickness of 50 μm. Thus, a first laminate sheet (first release liner/optical adhesive sheet/second release liner) as a raw material sheet of the optical adhesive sheet with a release liner was obtained. In ultraviolet irradiation, a black light lamp (a "bus") was used as an irradiation light source, and the irradiation intensity was set to 5mW/cm 2 。
< first contour machining >)
Next, the optical adhesive sheet of the first laminate is subjected to a contour processing (first contour processing step). Specifically, CO is irradiated to the first laminate in the thickness direction from the release liner L2 side by the first predetermined cutting line along the first laminate 2 And a laser for cutting the optical adhesive sheet and the release liner L2 on the release liner L1 in the thickness direction (laser processing). In the laser irradiation, a laser processing apparatus (trade name "LC500", manufactured by Wu Jing motor industry) was used, the pulse width of the irradiation laser was set to 3.3 μsec, the frequency of the pulse was set to 15kHz, and the laser output was set to 40W. In this step, a predetermined planar optical pressure-sensitive adhesive sheet and a first peripheral portion around the optical pressure-sensitive adhesive sheet are formed in a large optical pressure-sensitive adhesive sheet, and a second peripheral portion is formed on the first peripheral portion in the release liner L2.
< removal of surrounding portion, second shaping >
After the first contour machining step, the first peripheral portion and the second peripheral portion are removed from the release liner L1. Then, the release liner L1 is subjected to an external shape processing (second external shape processing step). Specifically, the release liner L1 is irradiated with CO in the thickness direction by the second prearranged cut line along the release liner L1 2 The release liner L1 is cut into a predetermined planar shape by a laser. The second prearranged cut line is in the plane direction compared with the first prearranged cut lineAway from 3mm to the outside. In the laser irradiation in this step, a laser processing apparatus (trade name "LC500", manufactured by Wu Jing motor industry) was used, the pulse width of the irradiation laser was set to 3.3 μsec, the frequency of the pulse was set to 15kHz, and the laser output was set to 40W.
By the above operation, the optical adhesive sheet of example 1 was produced as an adhesive sheet with a release liner on both sides (first release liner/optical adhesive sheet/second release liner).
Example 2
An optical adhesive sheet of example 2 was produced in the same manner as the optical adhesive sheet of example 1, except for the following matters. In the process of producing the first laminate, a release liner L3 is used as the second release liner instead of the release liner L2. The release liner L3 was a PET film (trade name "Diafoil MHE50", thickness 50 μm, manufactured by mitsubishi chemical company) having one side subjected to silicone release treatment.
Example 3
An optical adhesive sheet of example 3 was produced in the same manner as the optical adhesive sheet of example 1, except for the following matters. In the first laminate manufacturing step, the thickness of the optical adhesive sheet formed between the release liners L1 and L2 was set to 25 μm.
Comparative example 1
An optical adhesive sheet of comparative example 1 was produced in the same manner as the optical adhesive sheet of example 1 except for the following matters. In the first profile machining step, press working is performed instead of laser working. Specifically, the optical adhesive sheet on the release liner L1 is pressed from the release liner L2 side into the release liner L1 by the press working blade in the thickness direction, thereby forming the optical adhesive sheet having a predetermined planar shape. The press working blade has a tip with a tip angle of 30 degrees.
Example 4
First, the adhesive composition was applied to the release treated surface of the release liner L4 as the first release liner to form a coating film. The release liner L4 was a PET film (trade name "Diafoil MHE50", thickness 50 μm, manufactured by mitsubishi chemical company) having one side subjected to silicone release treatment. Next, the release treated surface of the release liner L5 as the second release liner was bonded to the coating film on the release liner L4. The release liner L5 was a PET film (trade name "Diafoil MHE50", thickness 50 μm, manufactured by mitsubishi chemical company) having one side subjected to silicone release treatment. Subsequently, the coating film was irradiated with ultraviolet light through the release liner L5 to cure the coating film with ultraviolet light, thereby forming an optical adhesive sheet having a thickness of 50 μm. Thus, an optical adhesive sheet with release liners L4, L5 was obtained.
Next, the release liner L5 is peeled from the optical adhesive sheet (first adhesive sheet) with the release liners L4, L5. Then, the exposed surface of the first adhesive sheet exposed by the peeling is subjected to plasma treatment. On the other hand, plasma treatment was also performed on both sides (first side, second side) of the polarizing film having a thickness of 30 μm. In each plasma treatment, a plasma irradiation apparatus (trade name "AP-TO5", manufactured by water industry Co., ltd.) was used, the voltage was set TO 160V, the frequency was set TO 10kHz, and the treatment speed was set TO 5000 mm/min (the same applies TO the plasma treatment described later). Then, the exposed surface of the first adhesive sheet is bonded to the first surface of the polarizing film. Thereby forming a first adhesive layer on the first side of the polarizing film. In the lamination, the pressure-sensitive adhesive sheet was pressure-bonded to the polarizing film by a single operation of reciprocating a 2kg roller at 25 ℃ (the same applies to the lamination described later).
Next, the release liner L4 is peeled from the other optical adhesive sheet (second adhesive sheet) with release liners L4, L5. Then, the exposed surface of the second pressure-sensitive adhesive sheet exposed by the peeling is subjected to plasma treatment. Then, the exposed surface of the second adhesive sheet is bonded to the second surface of the polarizing film. Thereby, a second adhesive layer was formed on the second surface of the polarizing film, and a second laminate sheet (first release liner/first adhesive layer/polarizing film/second adhesive layer/second release liner) was obtained as a raw material sheet of the polarizing film with a release liner.
Next, the second laminate is subjected to an outline processing (outline processing step). Specifically, by a predetermined cut line along the second laminateCO is irradiated to the second lamination sheet along the thickness direction 2 And cutting the second laminated sheet into a predetermined planar shape by laser light. In the laser irradiation, a laser processing apparatus (trade name "LC500", manufactured by Wu Jing motor industry) was used, the pulse width of the irradiation laser was set to 3.3 μsec, the frequency of the pulse was set to 15kHz, and the laser output was set to 40W.
By the above operation, the adhesive layer-carrying optical film of example 4 was produced as a double-sided release liner-carrying optical film (first release liner/first adhesive layer/polarizing film/second adhesive layer/second release liner).
Comparative example 2
An optical film with an adhesive layer of comparative example 2 was produced in the same manner as the optical film with an adhesive layer of example 4 except for the following matters. In the profile processing step, press processing is performed instead of laser processing. Specifically, the second laminate sheet is cut by pressing the press blade into the second laminate sheet from the release liner L5 side in the thickness direction, thereby forming an optical film with an adhesive layer having a predetermined planar shape. The press working blade has a tip with a tool tip angle of 30 degrees.
< modulus of elasticity under indentation >
Load-displacement measurement (first measurement) by nanoindentation was performed on the optical adhesive sheets of examples 1 to 3 and comparative example 1 and the first adhesive layers of example 4 and comparative example 2 at a position significantly away from the end portion.
For the optical adhesive sheets of examples 1 to 3 and comparative example 1, first, the first release liner was peeled from the optical adhesive sheet with the release liner. Next, a load-displacement curve was obtained by measuring load-displacement according to ISO14577 using a nanoindenter (trade name "triboindenor", manufactured by Hysitron corporation) on the exposed surface of the optical adhesive sheet exposed by the peeling. For the optical films with adhesive layers of example 4 and comparative example 2, first, the first release liner was peeled from the optical film with release liner. Next, the exposed surface of the first adhesive layer exposed by the peeling was subjected to load-displacement measurement according to ISO14577 using a nanoindenter (trade name "triboindenor", manufactured by Hysitron corporation), and a load-displacement curve was obtained. The measurement site in the first measurement is a site distant by 1000 μm or more from the side end face of the pressure-sensitive adhesive sheet or layer inward in the sheet surface direction.
In this measurement, the measurement mode was set to a single press-in measurement, the measurement temperature was set to 25 ℃, a diamond indenter (diameter: 20 μm) of Berkovich (triangular pyramid) was used as the indenter, the maximum press-in depth (maximum displacement hmax) of the indenter into the measurement sample during load application was set to 4 μm, the press-in speed of the indenter was set to 1000 nm/sec, and the pull-out speed of the indenter from the measurement sample during load removal was set to 1000 nm/sec. The resulting assay data were then processed using proprietary analysis software (ver.9.4.0.1) for "TI950 triboindanter". Specifically, the maximum load fmax (load acting on the indenter at the maximum displacement hmax), the contact projected area S (projected area of the contact area between the indenter and the specimen at the time of maximum load), and the slope D of the tangent line of the load-displacement curve at the time of the start of the load removal process are obtained based on the obtained load (f) -displacement (h) curve. Then, the indentation elastic modulus (= (pi) of the optical adhesive sheet or the first adhesive layer was calculated from the slope D and the contact projected area S 1/2 D)/(2S 1/2 )). This value is shown in tables 1 and 2 as the indentation elastic modulus E1 (kPa) (indentation elastic modulus E1 is the first indentation elastic modulus).
On the other hand, the ends of the optical adhesive sheets of examples 1 to 3 and comparative example 1 and the ends of the first adhesive layers of example 4 and comparative example 2 were subjected to load-displacement measurement (second measurement) by nanoindentation. The measurement site in the second measurement was a site distant from the side end face of the adhesive sheet or the first adhesive layer by 30 μm inward in the sheet surface direction. The measurement conditions in this measurement are the same as those in the first measurement. Then, the obtained measurement data was processed by using dedicated analysis software (ver.9.4.0.1) of "TI950 triboindanter" to calculate the indentation elastic modulus (= (pi) of the end portion of the optical adhesive sheet or the first adhesive layer 1/2 D)/(2S 1/2 )). This value is shown in tables 1 and 2 as the indentation elastic modulus E2 (kPa) (indentation elastic modulus E2 is the second indentation elastic modulus).
Length of soft end >
The length of the soft end portion was examined for each of the optical adhesive sheets of examples 1 to 3 and comparative example 1 and each of the first adhesive layers of example 4 and comparative example 2. Specifically, load-displacement measurement was performed on each of a plurality of portions (a plurality of measurement points) in the optical adhesive sheet or the first adhesive layer by nanoindentation. The measurement conditions were the same as those of the first measurement. The plurality of measurement points are aligned in a row at predetermined intervals from the side end face of the optical adhesive sheet or the first adhesive layer to the inside. The indentation elastic modulus at a plurality of measurement points was thus obtained. In the optical adhesive sheet or the first adhesive layer, a length from a portion having a press-in elastic modulus smaller than the press-in elastic modulus E1 of the main region to the side end face is defined as a length L of the soft end portion. The values are shown in tables 1 and 2.
< inclination angle of side face >
The inclination angle α of the side end face (side end face shown in fig. 2 and 5) was measured by a shape analysis laser microscope (trade name "VK-X1000", manufactured by KEYENCE) for each of the optical adhesive sheets of examples 1 to 3 and comparative example 1 and each of the first adhesive layers of example 4 and comparative example 2. The results are shown in tables 1 and 2.
TABLE 1
TABLE 2
/>
Claims (8)
1. An optical adhesive sheet having a main region portion and a soft end portion softer than the main region portion, wherein,
the ratio of the second press-fitting elastic modulus at 25 ℃ of the soft end portion to the first press-fitting elastic modulus at 25 ℃ of the main region portion is 0.85 or less.
2. The optical adhesive sheet according to claim 1, wherein a ratio of the second press-in elastic modulus to the first press-in elastic modulus is 0.5 or more.
3. The optical adhesive sheet according to claim 1, wherein the second press-in elastic modulus is 110kPa or less.
4. The optical adhesive sheet according to claim 1, wherein the second press-in elastic modulus is 50kPa or more.
5. The optical adhesive sheet according to claim 1, wherein the first press-in elastic modulus is 150kPa or less.
6. The optical adhesive sheet according to claim 1, wherein a length from an outer end to an inner end of the soft end in a plane direction of the optical adhesive sheet is 50 μm or more and 500 μm or less.
7. The optical adhesive sheet according to claim 1, wherein the soft end portion has a side end face inclined at an angle of 20 ° or more and 50 ° or less with respect to a thickness direction of the optical adhesive sheet.
8. An optical film with an adhesive layer, wherein the optical film with an adhesive layer has:
optical film
An adhesive layer formed of the optical adhesive sheet according to any one of claims 1 to 7 on the optical film.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2022157551A JP2024051402A (en) | 2022-09-30 | 2022-09-30 | Optical adhesive sheet and optical film having adhesive layer |
| JP2022-157551 | 2022-09-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117801719A true CN117801719A (en) | 2024-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311247567.4A Pending CN117801719A (en) | 2022-09-30 | 2023-09-25 | Optical adhesive sheet and optical film with adhesive layer |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2024051402A (en) |
| KR (1) | KR20240046032A (en) |
| CN (1) | CN117801719A (en) |
| TW (1) | TW202419598A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6807234B2 (en) | 2017-01-10 | 2021-01-06 | 日東電工株式会社 | Adhesive sheet |
-
2022
- 2022-09-30 JP JP2022157551A patent/JP2024051402A/en active Pending
-
2023
- 2023-09-18 TW TW112135460A patent/TW202419598A/en unknown
- 2023-09-20 KR KR1020230125198A patent/KR20240046032A/en unknown
- 2023-09-25 CN CN202311247567.4A patent/CN117801719A/en active Pending
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| Publication number | Publication date |
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| JP2024051402A (en) | 2024-04-11 |
| TW202419598A (en) | 2024-05-16 |
| KR20240046032A (en) | 2024-04-08 |
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