CN118222205A - Adhesive sheet for display and display panel comprising same - Google Patents
Adhesive sheet for display and display panel comprising same Download PDFInfo
- Publication number
- CN118222205A CN118222205A CN202311780823.6A CN202311780823A CN118222205A CN 118222205 A CN118222205 A CN 118222205A CN 202311780823 A CN202311780823 A CN 202311780823A CN 118222205 A CN118222205 A CN 118222205A
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- adhesive sheet
- display
- ultraviolet
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- 230000001070 adhesive effect Effects 0.000 title claims description 70
- 239000000853 adhesive Substances 0.000 title claims description 69
- 239000003999 initiator Substances 0.000 claims abstract description 68
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 39
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 38
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 239000000178 monomer Substances 0.000 claims abstract description 26
- WGXGKXTZIQFQFO-CMDGGOBGSA-N ethenyl (e)-3-phenylprop-2-enoate Chemical compound C=COC(=O)\C=C\C1=CC=CC=C1 WGXGKXTZIQFQFO-CMDGGOBGSA-N 0.000 claims abstract description 25
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000012965 benzophenone Substances 0.000 claims abstract description 24
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 19
- 239000002313 adhesive film Substances 0.000 claims description 59
- 238000003860 storage Methods 0.000 claims description 33
- 230000003287 optical effect Effects 0.000 claims description 31
- NPFYZDNDJHZQKY-UHFFFAOYSA-N 4-Hydroxybenzophenone Chemical compound C1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 NPFYZDNDJHZQKY-UHFFFAOYSA-N 0.000 claims description 6
- RLUFBDIRFJGKLY-UHFFFAOYSA-N (2,3-dichlorophenyl)-phenylmethanone Chemical compound ClC1=CC=CC(C(=O)C=2C=CC=CC=2)=C1Cl RLUFBDIRFJGKLY-UHFFFAOYSA-N 0.000 claims description 3
- PJCBRWRFLHBSNH-UHFFFAOYSA-N (2,5-dimethylphenyl)-phenylmethanone Chemical compound CC1=CC=C(C)C(C(=O)C=2C=CC=CC=2)=C1 PJCBRWRFLHBSNH-UHFFFAOYSA-N 0.000 claims description 3
- CKGKXGQVRVAKEA-UHFFFAOYSA-N (2-methylphenyl)-phenylmethanone Chemical compound CC1=CC=CC=C1C(=O)C1=CC=CC=C1 CKGKXGQVRVAKEA-UHFFFAOYSA-N 0.000 claims description 3
- JENOLWCGNVWTJN-UHFFFAOYSA-N (3,4-dimethylphenyl)-phenylmethanone Chemical compound C1=C(C)C(C)=CC=C1C(=O)C1=CC=CC=C1 JENOLWCGNVWTJN-UHFFFAOYSA-N 0.000 claims description 3
- URBLVRAVOIVZFJ-UHFFFAOYSA-N (3-methylphenyl)-phenylmethanone Chemical compound CC1=CC=CC(C(=O)C=2C=CC=CC=2)=C1 URBLVRAVOIVZFJ-UHFFFAOYSA-N 0.000 claims description 3
- LTYBJDPMCPTGEE-UHFFFAOYSA-N (4-benzoylphenyl) prop-2-enoate Chemical compound C1=CC(OC(=O)C=C)=CC=C1C(=O)C1=CC=CC=C1 LTYBJDPMCPTGEE-UHFFFAOYSA-N 0.000 claims description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 3
- IDLJKTNBZKSHIY-UHFFFAOYSA-N [4-(diethylamino)phenyl]-phenylmethanone Chemical compound C1=CC(N(CC)CC)=CC=C1C(=O)C1=CC=CC=C1 IDLJKTNBZKSHIY-UHFFFAOYSA-N 0.000 claims description 3
- LYXOWKPVTCPORE-UHFFFAOYSA-N phenyl-(4-phenylphenyl)methanone Chemical compound C=1C=C(C=2C=CC=CC=2)C=CC=1C(=O)C1=CC=CC=C1 LYXOWKPVTCPORE-UHFFFAOYSA-N 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 36
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 9
- -1 Acrylic ester Chemical class 0.000 description 9
- 229910001507 metal halide Inorganic materials 0.000 description 9
- 150000005309 metal halides Chemical class 0.000 description 9
- 239000011521 glass Substances 0.000 description 8
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 229920000139 polyethylene terephthalate Polymers 0.000 description 7
- 239000005020 polyethylene terephthalate Substances 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 7
- PSGCQDPCAWOCSH-UHFFFAOYSA-N (4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl) prop-2-enoate Chemical compound C1CC2(C)C(OC(=O)C=C)CC1C2(C)C PSGCQDPCAWOCSH-UHFFFAOYSA-N 0.000 description 6
- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 6
- WDQMWEYDKDCEHT-UHFFFAOYSA-N 2-ethylhexyl 2-methylprop-2-enoate Chemical compound CCCCC(CC)COC(=O)C(C)=C WDQMWEYDKDCEHT-UHFFFAOYSA-N 0.000 description 6
- RIWRBSMFKVOJMN-UHFFFAOYSA-N 2-methyl-1-phenylpropan-2-ol Chemical compound CC(C)(O)CC1=CC=CC=C1 RIWRBSMFKVOJMN-UHFFFAOYSA-N 0.000 description 6
- 239000012790 adhesive layer Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000002834 transmittance Methods 0.000 description 6
- VFHVQBAGLAREND-UHFFFAOYSA-N diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C1=CC=CC=C1 VFHVQBAGLAREND-UHFFFAOYSA-N 0.000 description 5
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical compound C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 description 3
- GJKGAPPUXSSCFI-UHFFFAOYSA-N 2-Hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone Chemical compound CC(C)(O)C(=O)C1=CC=C(OCCO)C=C1 GJKGAPPUXSSCFI-UHFFFAOYSA-N 0.000 description 3
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- MQDJYUACMFCOFT-UHFFFAOYSA-N bis[2-(1-hydroxycyclohexyl)phenyl]methanone Chemical compound C=1C=CC=C(C(=O)C=2C(=CC=CC=2)C2(O)CCCCC2)C=1C1(O)CCCCC1 MQDJYUACMFCOFT-UHFFFAOYSA-N 0.000 description 3
- 238000006352 cycloaddition reaction Methods 0.000 description 3
- QPOIJJUKCPCQIV-UHFFFAOYSA-N diphenylmethanone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1.C=1C=CC=CC=1C(=O)C1=CC=CC=C1 QPOIJJUKCPCQIV-UHFFFAOYSA-N 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000012956 1-hydroxycyclohexylphenyl-ketone Substances 0.000 description 2
- KWVGIHKZDCUPEU-UHFFFAOYSA-N 2,2-dimethoxy-2-phenylacetophenone Chemical compound C=1C=CC=CC=1C(OC)(OC)C(=O)C1=CC=CC=C1 KWVGIHKZDCUPEU-UHFFFAOYSA-N 0.000 description 2
- LWRBVKNFOYUCNP-UHFFFAOYSA-N 2-methyl-1-(4-methylsulfanylphenyl)-2-morpholin-4-ylpropan-1-one Chemical compound C1=CC(SC)=CC=C1C(=O)C(C)(C)N1CCOCC1 LWRBVKNFOYUCNP-UHFFFAOYSA-N 0.000 description 2
- GJIIAJVOYIPUPY-UHFFFAOYSA-N 2-methylidenebut-3-enoic acid Chemical compound OC(=O)C(=C)C=C GJIIAJVOYIPUPY-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical compound CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000004090 dissolution 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
- 238000005516 engineering process Methods 0.000 description 2
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- QPJVMBTYPHYUOC-UHFFFAOYSA-N methyl benzoate Chemical compound COC(=O)C1=CC=CC=C1 QPJVMBTYPHYUOC-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- PCKZAVNWRLEHIP-UHFFFAOYSA-N 2-hydroxy-1-[4-[[4-(2-hydroxy-2-methylpropanoyl)phenyl]methyl]phenyl]-2-methylpropan-1-one Chemical compound C1=CC(C(=O)C(C)(O)C)=CC=C1CC1=CC=C(C(=O)C(C)(C)O)C=C1 PCKZAVNWRLEHIP-UHFFFAOYSA-N 0.000 description 1
- XMLYCEVDHLAQEL-UHFFFAOYSA-N 2-hydroxy-2-methyl-1-phenylpropan-1-one Chemical compound CC(C)(O)C(=O)C1=CC=CC=C1 XMLYCEVDHLAQEL-UHFFFAOYSA-N 0.000 description 1
- 101100112111 Caenorhabditis elegans cand-1 gene Proteins 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- XAGORNOHMMOJNZ-UHFFFAOYSA-N OC(C(=O)C1=CC=CC=C1)(C)C.OC(C(=O)C1=CC=CC=C1)C Chemical compound OC(C(=O)C1=CC=CC=C1)(C)C.OC(C(=O)C1=CC=CC=C1)C XAGORNOHMMOJNZ-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 125000002147 dimethylamino group Chemical group [H]C([H])([H])N(*)C([H])([H])[H] 0.000 description 1
- KEEXOYPZMIJIEP-UHFFFAOYSA-N diphenoxyphosphoryl 2,4,6-trimethylbenzoate Chemical compound CC1=CC(C)=CC(C)=C1C(=O)OP(=O)(OC=1C=CC=CC=1)OC1=CC=CC=C1 KEEXOYPZMIJIEP-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229940095102 methyl benzoate Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides a bonding sheet for a display, comprising a cured product of a bonding composition, wherein the bonding composition comprises an acrylic resin, an acrylic monomer, an ultraviolet initiator and a crosslinking agent, the crosslinking agent comprises vinyl cinnamate, the ultraviolet initiator necessarily comprises more than one benzophenone initiator, and the bonding sheet comprises 0.1-3.0 parts by weight of vinyl cinnamate and 0.2-2.0 parts by weight of the benzophenone initiator relative to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
Description
Technical Field
The invention relates to an adhesive sheet for a display and a preparation method thereof. And more particularly, to an adhesive sheet including an optically transparent adhesive (OCA) film capable of being excellently adhered even if a display has a step or a bend and simultaneously achieving excellent optical characteristics and optical reliability, and a method of manufacturing the same.
Background
In the process of manufacturing a display, an adhesive film as a member used for assembling a panel material is an optically transparent adhesive film so as to be able to transmit light when a display module emits light.
On the other hand, recently, with rapid development of information communication technology and expansion of market, a display having flexibility has been attracting attention in display because of its various uses and applicability.
In a display having a portion with a height difference or a curvature, an adhesive sheet as a member used for assembling a panel material needs to be bonded excellently so as not to generate a tilting phenomenon even in the case where a height difference or curvature of the display is present.
Disclosure of Invention
Technical problem
The purpose of the present invention is to provide an adhesive sheet for a display, which comprises an optical transparent adhesive film that can be bonded excellently even in a portion of the display where a height difference or a bend exists, and can realize excellent optical characteristics and optical reliability at the same time, without causing a warpage phenomenon.
The present invention also provides a method for producing the adhesive sheet for a display of the present invention.
Further, an object of the present invention is to provide a method for manufacturing a display panel (panel) by using the adhesive sheet for a display of the present invention.
Further, an object of the present invention is to provide a display including the adhesive sheet for a display of the present invention.
The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention, which are not mentioned, can be understood by the following description, and can be more clearly understood by the embodiments of the present invention. Moreover, it is understood that the objects and advantages of the invention can be realized by the means of the instrumentalities and combinations particularly pointed out in the appended claims.
Technical proposal
In order to solve the above-described problems, according to one embodiment of the present invention, there is provided a bonding sheet for a display, comprising a cured product of a bonding composition, wherein the bonding composition comprises an acrylic resin, an acrylic monomer, an Ultraviolet (UV) initiator, and a crosslinking agent, the crosslinking agent comprises a vinyl cinnamate (VINYL CINNAMATE), the UV initiator comprises a benzophenone (benzophenone) initiator, and the bonding sheet comprises 0.1 to 3.0 parts by weight of the vinyl cinnamate and 0.2 to 2.0 parts by weight of the benzophenone initiator, based on 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
The benzophenone initiator may include one or more selected from the group consisting of benzophenone, dichlorobenzophenone, p-phenylbenzophenone, 4-diethylaminobenzophenone, 2, 5-dimethylbenzophenone, 3, 4-dimethylbenzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 2-dimethoxy-2-phenylacetophenone, 4-benzoylphenyl acrylate, and 4-hydroxybenzophenone.
The acrylic resin may be at least one selected from the group consisting of acrylic resins, urethane acrylic resins, and silicone acrylic resins.
The ultraviolet initiator may further include 0.01 to 0.2 part by weight of a long-wave ultraviolet initiator and 0.2 to 1.0 part by weight of a short-wave ultraviolet initiator, based on 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
The cured product may be an optically clear adhesive film.
The storage modulus (modulus) of the optically clear adhesive film at 60 ℃ and 1Hz may be 10000Pa to 100000Pa before ultraviolet curing, and 70000Pa to 150000Pa after ultraviolet curing.
The gel fraction of the optically transparent adhesive film may be 30 to 60 weight percent before ultraviolet curing, and 70 to 92 weight percent after ultraviolet curing.
The optically transparent adhesive film may be in a B-stage state.
The adhesive film may further comprise a first release film and a second release film disposed on both sides of the optically transparent adhesive film.
A display panel (DISPLAY PANEL) including the adhesive sheet for a display described above may be provided.
An organic electronic device including the above display panel may be provided.
ADVANTAGEOUS EFFECTS OF INVENTION
The adhesive sheet for a display of the present invention comprises a pre-cured (pre-cure) and cross-linking agent-containing B-stage-state optically transparent adhesive film which can be bonded excellently in such a manner that a warp phenomenon does not occur even in a portion of the display where a level difference or a bend exists by increasing storage modulus through a subsequent step of curing by ultraviolet irradiation (cure).
The adhesive sheet for a display of the present invention exhibits excellent adhesive strength even in a portion having a height difference or a curvature, and also exhibits excellent optical characteristics and optical reliability.
The effects of the present specification are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those of ordinary skill from the following description. Hereinafter, the above-described effects and specific effects of the present invention will be described while describing specific details for carrying out the present invention.
Drawings
Fig. 1 shows a cross-sectional view of an adhesive sheet for a display according to an example of the present invention.
Fig. 2a schematically shows a flowchart of applying the adhesive sheet for display according to an example of the present invention to a panel (panel) of a display.
Fig. 2b schematically shows a cross-sectional view of a display panel to which an adhesive sheet for a display according to an example of the present invention is applied.
Fig. 3 to 14 are graphs showing storage modulus (1 Hz) with temperature before and after uv curing of examples 1 to 8 and comparative examples 1 to 4 according to the present invention.
Description of the reference numerals
10: An adhesive sheet;
21: a first release film;
22: and a second release film.
Detailed Description
The foregoing objects, features, and advantages will be described in detail with reference to the accompanying drawings, whereby those skilled in the art to which the present invention pertains can easily implement the technical ideas of the present invention. In the process of describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar structural elements.
In the matters not described in the present specification, descriptions which can be sufficiently analogized by those of ordinary skill in the art to which the present invention pertains will be omitted.
In the present specification, the "upper (or lower)" of any structure disposed on the structure element or the "upper (or lower)" of the structure element means not only the disposition in which any structure is in contact with the upper (or lower) face of the structure element, but also other structures may be interposed between the structure element and any structure disposed on the structure element (or lower).
As used in this specification, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. In the present application, terms such as "consisting of … …" or "comprising" should not be construed as necessarily including all the various structural elements recited in the specification, but should be construed as possibly excluding some of the structural elements thereof or may also include additional structural elements.
The numerical values of optical characteristics such as transmittance and haze used in the present specification should be interpreted as representing "average values".
In the present specification, the unit "parts by weight" may refer to the ratio of the weights of the respective components.
In the present specification, "(meth) acrylate" means acrylate or methacrylate.
The adhesive sheet for a display according to an embodiment of the present invention comprises a cured product of an adhesive composition comprising an acrylic resin, an acrylic monomer, an ultraviolet initiator, and a crosslinking agent.
The cured product is an adhesive film as a member for assembling a display panel material. In the case of a display having a portion with a height difference or a curvature, the adhesive film for the display needs to be bonded excellently so that a tilting phenomenon does not occur even in the case of the display having a height difference or curvature. The cured product is an optically transparent adhesive film that can pass through the cured product when the display module emits light, and is required to exhibit excellent optical characteristics and optical reliability.
The adhesive sheet for a display according to the present invention is characterized by comprising a cured product of an adhesive composition, wherein the adhesive composition comprises an acrylic resin, an acrylic monomer, an ultraviolet initiator, and a crosslinking agent, the crosslinking agent comprises vinyl cinnamate, the ultraviolet initiator comprises a benzophenone initiator, and the adhesive composition comprises 0.1 to 3.0 parts by weight of the vinyl cinnamate and 0.2 to 2.0 parts by weight of the benzophenone initiator, based on 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
The cured product of the present invention may be formed by irradiating the adhesive composition with ultraviolet light (black light, wavelength: 315nm to 400 nm) and pre-curing (pre-hardening), and the cured product may be an optically transparent adhesive film. Preferably, the optically transparent adhesive film is in a B-stage (i.e., semi-cured state). When the transparent adhesive film for B-stage optical use is applied to a display, the display can be applied to a curved portion or a portion having a height difference in a display member without tilting.
The adhesive sheet for a display can also exhibit excellent optical characteristics and optical reliability.
The components of the adhesive composition of the present invention will be described below.
Acrylic resin
The acrylic resin of the adhesive composition of the present invention may be used without limitation as long as it is generally used as an ultraviolet curing resin to form an optically transparent adhesive film.
For example, the acrylic resin of the adhesive composition of the present invention may be one or more selected from the group consisting of acrylic resins, urethane acrylic resins, and silicone acrylic resins. For example, the acrylic resin may be a copolymer of acrylic monomers.
The acrylic monomer may be at least one selected from the group consisting of 2-ethylhexyl acrylate (2-EHA), 2-ethylhexyl methacrylate (2-EHMA), alkyl (meth) acrylates such as isobornyl acrylate (IBOA) and lauryl (meth) acrylate, hydroxyl group-containing alkyl (meth) acrylates such as hydroxyethyl acrylate (2-HEA), acrylamide (AAM), glycidyl (meth) acrylate, acryloylmorpholine (ACMO), vinyl Acrylic Acid (AA) and (meth) acrylic acid. For example, the acrylic resin may be a copolymer of 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isobornyl acrylate, and 2-hydroxyethyl acrylate.
The weight average molecular weight (Mw) of the above acrylate resin may be 500000g/mol to 1500000g/mol. The weight average molecular weight can be measured by gel permeation chromatography (Gel Permeation Chromatography, GPC).
Acrylic ester monomer
The adhesive composition comprises an acrylate monomer. For example, the acrylate monomer may be at least one selected from the group consisting of 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isobornyl acrylate, alkyl (meth) acrylates such as lauryl (meth) acrylate, hydroxyl group-containing alkyl (meth) acrylates such as 2-hydroxyethyl acrylate (2-HEA), acrylamide, glycidyl (meth) acrylate, acryloylmorpholine, vinyl acrylic acid, and (meth) acrylic acid. The adhesive composition may contain the acrylic monomer in a proportion of 0 to 70 weight percent, and may be mixed with the acrylic resin in a weight ratio of 99:1 to 30:70.
Crosslinking agent
The present invention may comprise vinyl cinnamate as a cross-linking agent. When the transparent adhesive film for optical use, which is a cured product that is pre-cured (primary cured) by irradiation with ultraviolet rays (black light, wavelength: 315nm to 400 nm), is in the B-stage state, vinyl cinnamate as the crosslinking agent is present in the transparent adhesive film for optical use in a state in which the crosslinking reaction is not performed.
However, when the transparent adhesive film for B-stage is cured by irradiation with ultraviolet rays (metal halide lamp, wavelength: 265nm to 420 nm) (secondary curing, ultraviolet curing 2) after the transparent adhesive film for B-stage is attached to a display panel, crosslinking (cross-linking) is performed by cycloaddition reaction (Cyclo Addition Reaction) between vinyl groups, and thus the adhesive property can be exhibited.
As described above, the present invention applies the transparent adhesive film for optical use to the display panel in a pre-cured (primary cured) state, and therefore, a portion where there is a bend or a height difference in the display part can be closely adhered and bonded in a state where the tilting phenomenon is minimized or eliminated, and thereafter, the parts of the display panel can be excellently bonded by performing ultraviolet curing (secondary curing).
The vinyl cinnamate may be contained in an amount of 0.1 to 3.0 parts by weight with respect to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer. For example, if the content of the vinyl cinnamate is less than 0.1 part by weight, the cycloaddition reaction is insufficient, and thus the gel fraction may be lowered and the change amount of the storage modulus may be lowered. If the content of the vinyl cinnamate is more than 3.0 parts by weight, the crosslinking reaction excessively occurs, the shrinkage after curing increases, a panel bending phenomenon due to shrinkage occurs, and a problem of deterioration of optical characteristics occurs.
Ultraviolet initiator
The ultraviolet initiator of the present invention is an additive component added to an acrylic resin, and is a substance that initiates polymerization (polymerization) reaction when irradiated with ultraviolet light. The ultraviolet initiator includes a benzophenone initiator.
Accordingly, the above adhesive composition comprising vinyl cinnamate as a crosslinking agent can exhibit excellent adhesion even in a portion of a display where a level difference and bending occur, and at the same time, can also exhibit excellent light end characteristics and optical reliability. For example, the problem that the optical characteristics decrease with an increase in the content of vinyl cinnamate can be prevented. Specifically, the above benzophenone initiator is involved in polymerization reaction when ultraviolet rays (black light) are irradiated, and vinyl cinnamate is reacted to cause crosslinking reaction when ultraviolet rays (metal halide lamps, wavelength) are irradiated, in which case the above benzophenone initiator may assist vinyl cinnamate to exert an influence on crosslinking reaction.
The benzophenone initiator may include one or more selected from the group consisting of benzophenone, dichlorobenzophenone, p-phenylbenzophenone, 4-diethylaminobenzophenone, 2, 5-dimethylbenzophenone, 3, 4-dimethylbenzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 2-dimethoxy-2-phenylacetophenone, 4-benzoylphenyl acrylate, and 4-hydroxybenzophenone.
The benzophenone initiator may be contained in an amount of 0.2 to 2.0 parts by weight relative to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer. For example, if the content of the benzophenone initiator is less than 0.2 parts by weight, the gel fraction may be reduced after curing due to insufficient curing reaction, and there is no difference between the storage modulus after curing and the storage modulus before curing, which may cause a problem of reduced adhesion. Further, if the content of the benzophenone initiator is more than 2.0 parts by weight, there is a problem that optical characteristics such as high haze after curing are deteriorated.
The ultraviolet initiator may include, in addition to the benzophenone-type initiator, a substance generally used as an ultraviolet initiator, and may be used by mixing one or more ultraviolet initiators.
The ultraviolet initiator may include an initiator selected from 1-hydroxycyclohexyl phenyl ketone (Irgacure 907), 2-methyl-1- [4- (methylthio) phenyl ] -2-morpholinopropane-1-one (Irgacure 184C), 2-hydroxy-2-methyl-1-phenyl-1-propanone (Irgacure 1173), an initiator (Irgacure 1173) of mixing Irgacure 184C with Irgacure 1173, 2-hydroxy-1- [4- (2-hydroxyethoxy) phenyl ] -2-methyl-1-propanone (Irgacure 2959), methyl benzoate (Darocure MBF), alpha-dimethoxy-alpha-phenylacetophenone (Irgacure 651), 2-benzyl-2- (dimethylamino) -1- [4- (4-morpholino) phenyl ] -1-propanone (Irgacure 369), an initiator (Irgacure 369 with Irgacure 651), diphenyl (2, 4, 6-trimethylbenzoyl) -2-methyl-1-propanone (Irgacure 2959), a initiator (Irgacure 819) of mixing with 3, irgacure 819, 3-dimethyl benzoyl-2- (4-morpholino) phenyl-acetophenone (Irgacure 369), a initiator of mixing with 3 of (Irgacure 819) of Darocure 2005 (Irgacure 819), and a initiator of three-dimethoxy-alpha-phenyl-acetophenone (Irgacure 819) More than one of a mixed initiator of Irgacure 819 and Darocur 1173 (Irgacure 2010) and a mixed initiator of Irgacure 819 and Darocur 1173 (Irgacure 2020).
The adhesive composition may further include a long-wave ultraviolet initiator and a short-wave ultraviolet initiator as the ultraviolet initiator. The long-wave ultraviolet initiator is a substance that absorbs light having a wavelength of (300) nm to (400) nm, and the short-wave ultraviolet initiator is a substance having a wavelength of (200) nm to (300) nm. Examples of the long wavelength ultraviolet initiator include Darocur T PO (2, 4, 6-trimethylbenzoyl-diphenylphosphine oxide (2, 4,6-trimethylbenzoyl-diph enylphosphine oxide)), darocur TPO-L (2, 4, 6-trimethylbenzoyl-diphenylphosphate (2, 4,6-trimethylbenzoyl-diphenyl phosphinate)), irgacur 819 (bis (2, 4, 6-trimethylbenzoyl) -phenylphosphine oxide (bis (2, 4,6-trimethylbe nzoyl) -phenylphosphineoxide)), and examples of the short wavelength ultraviolet initiator include Irg acure (1-hydroxy-cyclohexyl-phenyl-ketone (1-hydroxy-cyclohexyl-phenyl-keton e)), darocur 1173 ((2-hydroxy-2-methyl-1-phenyl-1-propanone) 2-hydroxy-1-phenyl-1-propanone), irgacure127 (2-hydroxy-1- {4- [ 2-hydroxy-4- (2-hydroxy-3) -phenyl ] -2-hydroxy-phenyl } -2-phenyl-32-propanone (2-hydroxy-3-phenyl) -3425), and the short wavelength ultraviolet initiator is defined as (2-hydroxy-4- [ 2-hydroxy-phenyl ] -2-phenyl ] -32-propanone (2-hydroxy-phenyl) -32-methyl ] -2-phenyl ] -32-ketone.
The ultraviolet initiator may include 0.01 to 0.2 parts by weight of the long wave ultraviolet initiator and 0.2 to 1.0 parts by weight of the short wave ultraviolet initiator with respect to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
For example, if the long-wave ultraviolet initiator is less than 0.01 parts by weight, a film sticking phenomenon occurs due to occurrence of uncured state, and if it is more than 0.2 parts by weight, it is difficult to prepare an optical transparent adhesive film in a semi-cured state (B-stage) due to excessive curing. Further, if the short wave ultraviolet initiator is less than 0.2 parts by weight, complete curing of the monomer may not be achieved at the time of ultraviolet curing, and if it is more than 1.0 parts by weight, shrinkage after curing may be increased due to excessive curing.
The adhesive composition for forming an optically clear adhesive film of the present invention may contain other additives in a small amount within a range that can exert the effects of the present invention, if necessary. For example, the additives may be selected from the group consisting of adhesion promoters, tackifiers, plasticizers, flow aids, wetting aids, rheology modifiers, antioxidants, and the like.
The above-mentioned optically transparent adhesive film is increased in storage modulus by a step of curing (cure) by irradiation of ultraviolet rays, which are irradiation by a metal halide lamp. The storage modulus at 60 ℃ and 1Hz may be 10000Pa to 100000Pa, for example 60000Pa to 98000Pa, before uv curing by a metal halide lamp. If the storage modulus before ultraviolet curing is less than 10000Pa, the shape cannot be maintained or a sticking phenomenon occurs during blanking of the film, and if the storage modulus before ultraviolet curing is more than 100000Pa, the problem of tilting of the display panel occurs.
Further, after ultraviolet curing by a metal halide lamp, the storage modulus of the optically transparent adhesive film may be 70000Pa to 150000Pa at 60℃and 1 Hz. For example, 80000Pa to 130000Pa. If the storage modulus after ultraviolet curing is less than 70000Pa, it may be difficult to achieve the display panel protection characteristics. Further, if the storage modulus after ultraviolet curing is more than 150000Pa, the film hardness (hardness) is excessively increased and a level difference warpage phenomenon occurs with the lapse of time.
The gel fraction of the optically clear adhesive film may be 30 to 60 weight percent before ultraviolet curing. For example, 45 to 60 weight percent may be used. If the gel fraction before ultraviolet curing is less than 30 weight percent, the shape cannot be maintained or a sticking phenomenon occurs during blanking of the film, and if the storage modulus before ultraviolet curing is more than 100000Pa, and if the storage modulus before ultraviolet curing is more than 60 weight percent, the problem of tilting occurs at the height difference part of the display panel.
The gel fraction of the optically transparent adhesive film after ultraviolet curing may be 70 to 92 weight percent. For example, it may be 80% to 90%. If the gel fraction after ultraviolet curing is less than 80 weight percent, the problem of display panel protection characteristics is presented, and if it is more than 92 weight percent, the problem of yellowing induced by residual vinyl cinnamate and benzophenone initiator occurs.
According to an embodiment of the present invention, as shown in fig. 1, the adhesive sheet 100 for a display according to an embodiment of the present invention may include a first release film 21 and a second release film 22 disposed on both sides of an optically transparent adhesive film 10. The release film may be formed by subjecting one surface of a base material to release treatment.
The substrate may include, but is not limited to, a polyethylene terephthalate (polyethylene terephthalate; PET) substrate. The material used in the above-mentioned release treatment may be used without limitation as long as it is a material commonly used in the art for release treatment, and for example, release treatment using silicon is preferable.
According to still another embodiment of the present invention, there is provided a method for producing the adhesive sheet for display use of the present invention described above. The preparation method of the bonding sheet for the display comprises the following steps: mixing an acrylic resin, an acrylic monomer, an ultraviolet initiator, and a crosslinking agent to obtain a bonding composition; after the adhesive composition is coated on the first release film, a second release film is coated on the first release film Fang Peizhi, so that an adhesive sheet structure is formed; and pre-curing (primary curing) the adhesive sheet structure by irradiation with ultraviolet light by black light, thereby forming the applied adhesive composition into an optical transparent adhesive film in a B-stage state. The crosslinking agent contains vinyl cinnamate, the ultraviolet initiator contains a benzophenone initiator, and the crosslinking agent contains 0.1 to 3.0 parts by weight of the vinyl cinnamate and 0.2 to 2.0 parts by weight of the benzophenone initiator relative to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
According to another embodiment of the present invention, there is provided a method of manufacturing a display panel by using the above-described adhesive sheet for a display of the present invention as described. The preparation method of the display panel can comprise the following steps: extracting the optically transparent adhesive film from the adhesive sheet for display according to the present invention; disposing the optically transparent adhesive film on one or more display members; and curing by irradiating ultraviolet rays to the optically transparent adhesive film. The one or more display members may have a height difference (step) or a curve, and the optically transparent adhesive film may be bonded to the height difference or the curve by the ultraviolet curing step.
According to still another embodiment of the present invention, a display including the adhesive sheet for a display of the present invention described above can be provided. The display of the present invention is bonded by the optically transparent adhesive film of the present invention, which can achieve bonding so as to be compatible with a height difference or bending existing in a member of the display, and thus has excellent bonding reliability. And, it is possible to simultaneously exhibit excellent optical characteristics and optical reliability.
The structure and function of the present invention will be described in more detail below with reference to preferred embodiments of the present invention. This is presented as a preferred example of the invention and is not to be construed in any way as limiting the invention.
Those not described here are sufficiently analogized to those skilled in the art, and therefore, descriptions thereof are omitted.
Examples
Example 1
(1) Preparation of acrylic resin
After mixing 35 parts by weight of isobornyl acrylate, 11 parts by weight of 2-ethylhexyl methacrylate, 38 parts by weight of 2-ethylhexyl acrylate and 16 parts by weight of 2-hydroxyethyl acrylate, copolymerization was performed to obtain an acrylic resin.
(2) Preparation of bonding composition
60 Parts by weight of the above acrylic resin was mixed with 40 parts by weight of an acrylic monomer. Specifically, 8 parts by weight of isobornyl acrylate, 5 parts by weight of 2-ethylhexyl methacrylate, 19 parts by weight of 2-ethylhexyl acrylate, and 8 parts by weight of 2-hydroxyethyl acrylate were mixed as the above acrylate monomers. Then, a bonding composition was prepared by mixing 0.1 part by weight of vinyl cinnamate as a crosslinking agent, comprising 0.3 part by weight of Darocur1173, 0.2 part by weight of Darocur TPO, and 0.5 part by weight of benzophenone as an ultraviolet initiator, with respect to 100 parts by weight of the above-mentioned acrylic resin and the above-mentioned acrylic monomer.
(3) Preparation of first release film and second release film
2 Polyethylene terephthalate (PET) substrates were prepared, and a first release film (heavy release) and a second release film (light release) of a silicon release treatment were prepared by film-coating a silicon release agent on the lower surface of each polyethylene terephthalate (PET) substrate.
(4) Preparation of adhesive sheet
An optically clear adhesive film having a thickness of 200 μm was formed by applying the above adhesive composition prepared in step (2) on the above first release film. Then, the second release film is disposed on the optically transparent adhesive film so as to be in contact with the adhesive film, thereby forming an adhesive sheet structure. The adhesive sheet structure is irradiated with ultraviolet light (black light lamp, wavelength: 315nm to 400 nm) to perform pre-curing (primary curing).
Examples 2 to 8 and comparative examples 1 to 4
Adhesive sheets were prepared in the same manner as in example 1 above, and adhesive sheets of examples 2 to 8 and comparative examples 1 to 4 were prepared by changing the compositions of the ultraviolet initiator and the crosslinking agent in the above adhesive compositions according to tables 1 to 2.
TABLE 1
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Darocur 1173 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Darocur TPO | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Benzophenone (benzophenone) | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.2 |
| Cinnamic acid vinyl ester | 0.1 | 0.5 | 1 | 2 | 3 | 0.5 |
TABLE 2
| Example 7 | Example 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Darocur 1173 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
| Darocur TPO | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Benzophenone (benzophenone) | 1 | 2 | 1 | 1 | 0.1 | 3 |
| Cinnamic acid vinyl ester | 0.5 | 0.5 | 0.05 | 4 | 0.5 | 0.5 |
Evaluation of
Experimental example 1: determination of gel fraction
For the adhesive sheets for displays prepared according to examples and comparative examples, only 0.2g of an optically transparent adhesive film as an adhesive layer was taken and put into a 200 mesh net (mesh) for wrapping. The web wrapped with the tie layer was then placed in a 500ml Polyethylene (PE) bottle containing ethyl acetate (EAc) and after 24 hours of standing at a constant temperature of 25 ℃, the web was rinsed three times with ethyl acetate. After the residual adhesive layer was dried with hot air at 85℃for 2 hours to completely remove ethyl acetate, the weight was measured, and the gel fraction was measured by the following equation 1 using the weight of the adhesive layer before dissolution and the weight reduced after dissolution, before and after irradiation with ultraviolet rays (metal halide lamp, wavelength: 265nm to 420 nm) (3000 mJ), respectively. The results are shown in tables 3 to 5 below.
Mathematics 1
Experimental example 2: measurement of storage modulus
In order to measure the storage modulus of the adhesive sheet in the above examples and comparative examples, the samples were obtained by extracting only the optically transparent adhesive film, and the method thereof is as follows.
Method for sampling
The release films on both sides were removed and the adhesive layer was extracted in the above examples and comparative examples, respectively, and 200 μm transparent adhesive films were sampled, and this procedure was repeated 3 times, and 3 transparent adhesive films for optical use having a total thickness of 600 μm were laminated to prepare transparent adhesive film samples for optical use having a total thickness of 200 μm.
Storage modulus measuring method
Temperature-based storage moduli (storage moduli) were measured for the respective optically clear adhesive film samples of the above examples and comparative examples under the conditions of an Axial force (Axial force) of 2N, a Start temperature (Start temp.) of-55 ℃, an End temperature (End temp.) of 250 ℃, a temperature raising rate of 10 ℃/min, a tension (strain) of 1% and a Frequency (Frequency) of 1Hz using a Rheometer (TA instrument, ARES G2) as a measuring device, respectively before and after irradiation of ultraviolet rays (metal halide lamps) (3000 mJ), that is, respectively before and after ultraviolet ray curing.
The storage modulus values at 25℃and 60℃measured from the data plotted according to the above measurement (FIGS. 3 to 14) are shown in tables 3 to 5.
TABLE 3 Table 3
TABLE 4 Table 4
TABLE 5
As shown in tables 3 to 5, in the case of examples, it was confirmed that the gel fraction before ultraviolet curing was 30 to 60 weight percent, the gel fraction after ultraviolet curing was 70 to 92 weight percent, the storage modulus before ultraviolet curing was 10000 to 100000Pa under 60 ℃ and 1Hz, and the storage modulus after ultraviolet curing was in the range of 70000Pa to 150000Pa under 60 ℃ and 1 Hz.
Further, it is found that the change in storage modulus with temperature before and after curing is large in examples, unlike comparative examples. Accordingly, in the pre-curing step, the effect of overcoming the height difference of the display panel is excellent, and after curing, the impact resistance effect of the display is excellent. For example, it is found that the gel fraction after curing is low in comparative example 1, the change amount of the storage modulus before and after curing is also small, the gel fraction after curing is high in comparative example 2, the storage modulus at 60 ℃ after curing is out of the target range, the gel fraction after curing is low in comparative example 3, the change amount of the storage modulus before and after curing is also small, and the storage modulus value after curing is low in comparative example 4. For example, it is found that the difference in the storage modulus and the change amount of the storage modulus after curing is large as compared with example 5 in which the sum of the content of vinyl cinnamate and benzophenone is the same. As shown in fig. 11 and 13, it is clear that the storage modulus of comparative examples 1 and 3 hardly changed before and after the irradiation of ultraviolet rays.
Experimental example 3: measurement of optical properties (b, total transmittance (t.t.), haze (haze))
The adhesive layers were removed from the release films of the above examples and comparative examples, and the films were sampled to 200 μm of optically clear adhesive film, and the optically clear adhesive films of the above examples and comparative examples were placed on a Haze Meter (NDH-7000). Then, total transmittance (total transmittance, t.t.) and haze were measured simultaneously by ASTM D1003 measurement method, and b, which was defined by CIE 1976L, a, b, colorimeter, were measured before and after ultraviolet (metal halide lamp) irradiation (3000 mJ), respectively. The results are shown in tables 6 to 8 below.
TABLE 6
TABLE 7
TABLE 8
As shown in tables 6 to 8, it is clear that the examples, unlike the comparative examples, exhibit a predetermined level of b-value, excellent total transmittance (t.t.), and low haze. In particular, it is found that the b-value after curing in comparative example 2 is very high, and in the case of comparative example 4, the haze value after curing is high. That is, in the case of the comparative example, it is found that the optical characteristics are lowered.
Experimental example 4: determination of optical reliability
The optically clear adhesive films of examples and comparative examples were sampled in the same manner as in experimental example 3. Then, the optically transparent adhesive film (thickness (a) =200 μm) was exposed to a severe atmosphere of 85 ℃/85% high temperature and high humidity for 500 hours (h) and 1000 hours.
The b-type, total transmittance and haze of the optically clear adhesive films before and after 500 hours of exposure to the above environment and before and after 1000 hours of exposure to the above environment were measured in the same manner as in experimental example 3, and the results are shown in tables 9 to 10.
TABLE 9
Table 10
As shown in tables 9 and 10, it was confirmed that the examples and the comparative examples exhibited excellent optical reliability in both 500 hours and 1000 hours. For example, it is found that the b-value and haze of comparative example 2 are both high. Further, in the case of comparative example 4, it was found that the haze was quite high at 500 hours of exposure.
Experimental example 5: cohesive force (gf/25 mm)
The adhesive sheets for displays of examples and comparative examples were cut to a width of 1 inch, and after removing a release film, the adhesive sheets were adhered to a glass (glass) or polarizing plate (pol.) on the surface of the sheet after washing, and after 30 minutes, the adhesive force (unit: gf/25 mm) of the adhesive layers was measured at a speed of 5mm per second with 180 ° glass. The results are shown in tables 11 and 12 below.
TABLE 11
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Glass adhesion at 25 DEG C | 5070 | 5530 | 5280 | 5200 | 5150 | 5480 |
| 85 ℃ Polarized light plate adhesion | 680 | 657 | 656 | 631 | 610 | 701 |
Table 12
| Example 7 | Example 8 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Glass adhesion at 25 DEG C | 5750 | 5340 | 5660 | 4420 | 5120 | 5350 |
| 85 ℃ Polarized light plate adhesion | 662 | 601 | 720 | 480 | 400 | 611 |
The optically transparent adhesive film should have a predetermined adhesive force or more so that the film can be attached to the display panel well and can be smoothly subjected to the subsequent steps as a film before irradiation with ultraviolet rays (3000 mJ) by a metal halide lamp. Unlike glass, the optically transparent adhesive film tends to be prone to warpage of the polarizing plate in a high temperature region. The optically transparent adhesive film exhibits the above-mentioned adhesive force even at a high temperature of 85 ℃ and adheres to the display panel, and also exhibits an effective adhesive force in a subsequent step.
Specifically, as shown in tables 11 and 12, it is clear that examples, unlike comparative examples, exhibit excellent adhesion to glass and polarizing plates, respectively. For example, it is found that the adhesion to the polarizing plate is too high in comparative example 1, the adhesion to both glass and polarizing plate in comparative example 2 is low, and the adhesion to the polarizing plate in comparative example 3 is too low.
As described above, the present invention has been described, but the present invention is not limited to the embodiments disclosed in the other specification, and it is obvious that a person having ordinary skill in the art to which the present invention pertains can realize various modifications within the scope of the technical idea of the present invention. Further, even if the operational effects on the structure of the present invention are not explicitly described in the description of the embodiments of the present invention, it should be recognized that effects that can be predicted by the corresponding structure.
Claims (11)
1. An adhesive sheet for a display, characterized in that,
Comprising a cured product of the adhesive composition,
The bonding composition comprises acrylic resin, acrylic monomer, ultraviolet initiator and cross-linking agent,
The crosslinking agent comprises vinyl cinnamate, the ultraviolet initiator comprises a benzophenone initiator,
The composition comprises 0.1 to 3.0 parts by weight of the vinyl cinnamate and 0.2 to 2.0 parts by weight of the benzophenone initiator relative to 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
2. The adhesive sheet for a display according to claim 1, wherein the benzophenone initiator comprises at least one selected from the group consisting of benzophenone, dichlorobenzophenone, p-phenylbenzophenone, 4-diethylaminobenzophenone, 2, 5-dimethylbenzophenone, 3, 4-dimethylbenzophenone, 2-methylbenzophenone, 3-methylbenzophenone, 2-dimethoxy-2-phenylacetophenone, 4-benzoylphenylacrylate and 4-hydroxybenzophenone.
3. The adhesive sheet for a display according to claim 1, wherein the acrylic resin is at least one selected from the group consisting of an acrylic resin, a urethane acrylic resin and a silicone acrylic resin.
4. The adhesive sheet for a display according to claim 1, wherein the ultraviolet initiator further comprises 0.01 to 0.2 part by weight of a long-wave ultraviolet initiator and 0.2 to 1.0 part by weight of a short-wave ultraviolet initiator, based on 100 parts by weight of the total content of the acrylic resin and the acrylic monomer.
5. The adhesive sheet for a display according to claim 1, wherein the cured product is an optically transparent adhesive film.
6. The adhesive sheet for a display according to claim 5, wherein,
Before ultraviolet curing, the storage modulus of the transparent adhesive film for optical use is 10000Pa to 100000Pa under the conditions of 60 ℃ and 1Hz,
After ultraviolet curing, the storage modulus of the optically clear adhesive film at 60 ℃ and 1Hz is 70000Pa to 150000Pa.
7. The adhesive sheet for a display according to claim 5, wherein,
The gel fraction of the optically transparent adhesive film is 30 to 60 weight percent before ultraviolet curing,
After ultraviolet curing, the gel fraction of the optically transparent adhesive film is 70 to 92 weight percent.
8. The adhesive sheet for a display according to claim 5, wherein the optically transparent adhesive film is in a B-stage state.
9. The adhesive sheet for a display according to claim 5, further comprising a first release film and a second release film disposed on both sides of the optically transparent adhesive film.
10. A display panel comprising the adhesive sheet for display according to any one of claims 1 to 9.
11. An electronic device comprising the display panel of claim 10.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2022-0181080 | 2022-12-21 | ||
| KR1020220181080A KR20240098896A (en) | 2022-12-21 | Adhesive sheet for display and display panel comprising the same |
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| Publication Number | Publication Date |
|---|---|
| CN118222205A true CN118222205A (en) | 2024-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311780823.6A Pending CN118222205A (en) | 2022-12-21 | 2023-12-21 | Adhesive sheet for display and display panel comprising same |
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| Country | Link |
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| CN (1) | CN118222205A (en) |
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