CN109810637B - Adhesive composition for polarizing plate, and optical display - Google Patents
Adhesive composition for polarizing plate, and optical display Download PDFInfo
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- CN109810637B CN109810637B CN201811406690.5A CN201811406690A CN109810637B CN 109810637 B CN109810637 B CN 109810637B CN 201811406690 A CN201811406690 A CN 201811406690A CN 109810637 B CN109810637 B CN 109810637B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention provides an adhesive composition for a polarizing plate, a polarizing plate and an optical display. The adhesive composition for a polarizing plate includes: an epoxy compound; (meth) acrylate compounds; and a photoinitiator, wherein the epoxy compound comprises an alicyclic epoxy compound and an aromatic epoxy compound, and the aromatic epoxy compound comprises 10 to 30 parts by weight of a polyglycidyl ether of an aromatic compound per 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of korean patent application No. 10-2017-0156795, filed at the korean intellectual property office on 22/11/2017, the entire disclosure of which is incorporated herein by reference.
Technical Field
The invention relates to an adhesive composition for a polarizing plate, a polarizing plate and an optical display. More particularly, the present invention relates to a photocurable adhesive composition for a polarizing plate, and an optical display.
Background
The liquid crystal display includes a liquid crystal panel and polarizing plates disposed on both surfaces of the liquid crystal panel. The polarizing plate includes a polarizer and protective films formed on both surfaces of the polarizer. Recently, a polarizing plate includes a protective film on one surface of a polarizer and a coating layer on the other surface of the polarizer in order to realize a slim structure.
Since an adhesive for a polarizing plate is required to apply adhesiveness between a polyvinyl alcohol (PVA) film and a cellulose protective film, a hydrophilic and water-soluble PVA adhesive is widely used in the art. Polarizing plates using water-based adhesives may undergo dimensional changes due to heat from a backlight unit, and distortion caused by the dimensional changes is localized in an area on a screen. Therefore, when it is required that the screen as a whole displays black, there may be locally significant light leakage (flare). Therefore, a cationically polymerizable UV curable adhesive has been proposed as an alternative to the water-based adhesive (see Japanese unexamined patent publication No. 2008-233874).
Since the cationically polymerizable UV curable adhesive undergoes a dark reaction (post-polymerization) after irradiation with UV light, there is a problem of easy curling when the cured product of the adhesive is stored in the form of a roll. In addition, cationically polymerizable UV curable adhesives are susceptible to moisture when cured and may suffer from curing state deviations. Therefore, in order to achieve a uniform cured state, it is necessary to maintain strict control not only on the environmental humidity but also on the water content of the PVA-based polarizing plate.
Free radical polymerizable UV curable adhesives suffer less from such problems. Polarizing plates using radical polymerizable UV curable adhesives may suffer from deterioration in polarization efficiency when exposed to moist heat conditions for a long time, and light leakage may occur at the cut-off of a polarizer dyed with iodine or dye. In addition, the polarizing plate may suffer from severe light leakage under severer conditions than wet heat conditions (e.g., immersion in warm water having a temperature of 60 ℃). That is, a polarizing plate having better resistance to moist heat than a typical polarizing plate under severe use conditions is required. Further, an adhesive composition containing both a radical polymerizable (meth) acrylate compound and a cationic polymerizable compound is proposed to achieve convenient bonding with sufficient adhesive strength between a polyvinyl alcohol film and a plastic film (see japanese unexamined patent publication No. 2008-260879).
Disclosure of Invention
An object of the present invention is to provide an adhesive composition for a polarizing plate that can exhibit good adhesive strength for all of a triacetyl cellulose (TAC) film, a polyethylene terephthalate (PET) film, and a Cyclic Olefin Polymer (COP) film.
Another object of the present invention is to provide an adhesive composition for a polarizing plate that can exhibit good adhesive strength to a COP film produced by solution casting.
Another object of the present invention is to provide an adhesive composition for a polarizing plate that can prevent or minimize the generation of cracks in the polarizing plate upon thermal shock.
It is still another object of the present invention to provide an adhesive composition for a polarizing plate that can exhibit good adhesive strength to each of a polarizer, a PET film, a COP film, and a TAC film even after being placed under high temperature and high humidity conditions.
According to one aspect of the present invention, an adhesive composition for a polarizing plate comprises: an epoxy compound; (meth) acrylate compounds; and a photoinitiator, wherein the epoxy compound comprises an alicyclic epoxy compound and an aromatic epoxy compound, and the aromatic epoxy compound comprises 10 to 30 parts by weight of a polyglycidyl ether of an aromatic compound per 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
In one embodiment, the polyglycidyl ether of an aromatic compound can comprise a diglycidyl ether of an aromatic compound having at least two phenolic hydroxyl groups.
In one embodiment, the polyglycidyl ether of an aromatic compound can comprise at least one of resorcinol diglycidyl ether, hydroquinone diglycidyl ether, and catechol diglycidyl ether.
In one embodiment, the polyglycidyl ether of an aromatic compound may be present in an amount of 10 parts by weight to 50 parts by weight relative to 100 parts by weight of the epoxy compound.
In one embodiment, the cycloaliphatic epoxy compound may comprise 20 to 80 parts by weight of the difunctional cycloaliphatic epoxy compound, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
In one embodiment, the aromatic epoxy compound may further comprise a monoglycidyl ether of an aromatic compound.
In one embodiment, the monoglycidyl ether of an aromatic compound may comprise at least one of phenyl glycidyl ether, cresyl glycidyl ether, and nonylphenyl glycidyl ether.
In one embodiment, the (meth) acrylate compound may comprise a monofunctional (meth) acrylate compound having at least one hydroxyl group.
In one embodiment, the (meth) acrylate compound may be present in an amount of 5 parts by weight to 60 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
In one embodiment, a polarizer of a polarizing plate including an adhesive layer formed of the adhesive composition for a polarizing plate may have a Machine Direction (MD) maximum crack length of 3 mm or less than 3 mm when measured after 100 thermal shock cycles, wherein one thermal shock cycle is performed by placing the polarizing plate at-40 ℃ for 30 minutes and heating the polarizing plate from-40 ℃ to 85 ℃, followed by placing the polarizing plate at 85 ℃ for 30 minutes.
According to another aspect of the present invention, the polarizing plate may include an adhesive layer formed of the adhesive composition for a polarizing plate.
In one embodiment, the polarizing plate may have a color coordinate bs value of 3 or less than 3.
According to another aspect of the present invention, the optical display may include a polarizing plate.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail. It is to be understood that the present invention is not limited to the following examples and may be implemented using various means. The following examples are put forth so as to provide a thorough disclosure of the present invention and to provide a thorough understanding of the present invention to those skilled in the art.
Herein, the term "(meth) acryl" refers to acryl and/or methacryl.
Herein, the term "optical film" refers to a film stacked on a polarizing plate through an adhesive layer, and includes a protective film, a non-stretched film that does not provide phase retardation, or a stretched film that provides a certain range of phase retardation.
Hereinafter, an adhesive composition for a polarizing plate according to one embodiment of the present invention will be described.
The adhesive composition for a polarizing plate according to this embodiment includes: an epoxy compound; (meth) acrylate compounds; and a photoinitiator, wherein the epoxy compound comprises an aromatic epoxy compound and an alicyclic epoxy compound, and the aromatic epoxy compound comprises 10 to 30 parts by weight of a polyglycidyl ether of an aromatic compound per 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
The adhesive composition according to the present invention includes the polyglycidyl ether of an aromatic compound and the (meth) acrylate compound within the above ranges, thereby exhibiting good water resistance and adhesive strength for all of the cellulose film including a TAC film and the polyester film including a cycloolefin polymer film and a PET film, while improving reliability by reducing the crack length in the polarizing plate upon thermal shock. In the polarizing plate including the adhesive layer formed of the adhesive composition according to the present invention, the polarizer may have a Machine Direction (MD) maximum crack length of 3 mm or less than 3 mm when measured after 100 thermal shock cycles, wherein one thermal shock cycle is performed by placing the polarizing plate at-40 ℃ for 30 minutes and heating the polarizing plate from-40 ℃ to 85 ℃, followed by placing the polarizing plate at 85 ℃ for 30 minutes. Within this range of maximum crack lengths, the polarizing plate does not suffer from degradation in the degree of polarization and the degree of permeability under heat impact conditions.
The protective film formed of the optically transparent resin can be produced by solution casting, solution extrusion, calendering, compression, and the like. Specifically, in the solution casting, the protective film is formed by dissolving the optically transparent resin in a solvent, followed by casting the resin solution using a drum casting machine, a tape casting machine, a spin coating machine, or the like. Here, examples of the solvent may include aromatic hydrocarbons such as benzene, toluene, and xylene; aliphatic hydrocarbons such as cyclohexane and decalin; esters such as ethyl acetate and butyl acetate; ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; an ether; a halogenated hydrocarbon; dimethylformamide, and the like. Protective films produced by different methods have surfaces with different properties. The conventional adhesive composition has a low adhesive strength to the cycloolefin film produced by solution casting. The adhesive composition according to the present invention may exhibit good characteristics in terms of durability and adhesive strength for a cycloolefin film produced by solution casting. Preferably, the polyglycidyl ether of an aromatic compound can be present in an amount of 10 parts by weight to 25 parts by weight.
For example, the aromatic epoxy compound may include 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, or 30 parts by weight of the polyglycidyl ether of an aromatic compound, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
The aromatic epoxy compound may comprise a polyglycidyl ether of an aromatic compound. For example, the polyglycidyl ether of an aromatic compound can comprise a polyglycidyl ether prepared from an aromatic compound having at least two hydroxyl groups. Specifically, the polyglycidyl ether of an aromatic compound may contain at least one selected from the group consisting of: polyglycidyl ethers of monohydroxyphenols having at least one aromatic ring (e.g., phenol, cresol, and butylphenol), or alkylene oxide adducts thereof, for example, glycidyl ethers of bisphenol a, bisphenol F, or epoxy novolac resins, or alkylene oxide adducts thereof; polyglycidyl ethers of aromatic compounds having at least two phenolic hydroxyl groups (e.g., resorcinol, hydroquinone, or catechol); polyglycidyl ethers of aromatic compounds having at least two alcoholic hydroxyl groups (e.g., benzenedimethanol, benzenediethanol, or benzenedibutanol); glycidyl esters of polybasic acid-based aromatic compounds having at least two carboxylic acid groups (e.g., phthalic acid, terephthalic acid, or trimellitic acid); glycidyl esters of benzoic acid (e.g., benzoic acid, toluic acid, and naphthoic acid); styrene oxide; and the epoxide of divinylbenzene.
Preferably, the polyglycidyl ether of an aromatic compound comprises a diglycidyl ether of an aromatic compound. The diglycidyl ether of the aromatic compound may include a diglycidyl ether formed of an aromatic compound having at least two phenolic hydroxyl groups. For example, the polyglycidyl ether of an aromatic compound may comprise a diglycidyl ether or polyglycidyl ether of an aromatic compound having at least two phenolic hydroxyl groups (e.g., resorcinol, hydroquinone, or catechol). Specifically, the polyglycidyl ether of an aromatic compound may include at least one of resorcinol diglycidyl ether, hydroquinone diglycidyl ether, and catechol diglycidyl ether including catechol diglycidyl ether.
The polyglycidyl ether of an aromatic compound may be present in an amount of 10 parts by weight to 50 parts by weight, preferably 10 parts by weight to 40 parts by weight, more preferably 10 parts by weight to 35 parts by weight, relative to 100 parts by weight of the epoxy compound. Within this range, the adhesive composition may exhibit good crack resistance and good adhesive strength to COP film upon thermal shock. For example, the polyglycidyl ether of an aromatic compound may be present in an amount of 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, or 50 parts by weight.
The aromatic epoxy compound may further comprise a monoglycidyl ether of an aromatic compound. By further comprising an aromatic epoxy compound of a monoglycidyl ether of an aromatic compound, the adhesive composition has improved coatability by reducing viscosity. The monoglycidyl ether of an aromatic compound may include a glycidyl ether formed from an aromatic compound having one hydroxyl group. For example, the monoglycidyl ether of an aromatic compound may comprise at least one of phenyl glycidyl ether, cresyl glycidyl ether, nonylphenyl glycidyl ether.
The monoglycidyl ether of an aromatic compound may optionally be present in an amount of 20 parts by weight or less than 20 parts by weight, or 1 part by weight to 20 parts by weight, preferably 2 parts by weight to 15 parts by weight, more preferably 5 parts by weight to 15 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the adhesive composition exhibits a reduction in overall viscosity, allows reaction regulation, and may have improved adhesive strength to COP films. For example, the monoglycidyl ether of an aromatic compound may be present in an amount of 0 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, or 20 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
The monoglycidyl ether of an aromatic compound may optionally be present in an amount of 30 parts by weight or less than 30 parts by weight, preferably 1 part by weight to 30 parts by weight, relative to 100 parts by weight of the epoxy compound. Within this range, the adhesive composition may exhibit good crack resistance and good adhesive strength to COP film upon thermal shock. For example, the monoglycidyl ether of an aromatic compound may be present in an amount of 0 parts by weight, 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, or 30 parts by weight.
Cycloaliphatic epoxy compounds can be polymerized by cations initiated by light. Alicyclic epoxy group means a compound obtained by reacting C3To C20A functional group obtained by epoxidizing an alicyclic group having C3To C20C of a functional group obtained by epoxidation of an alicyclic group2To C20Alicyclic radicals, or having a general formula formed by reaction of C3To C20C of a functional group obtained by epoxidation of an alicyclic group1To C10An alkyl group. Specifically, the alicyclic epoxy group means at least one of an epoxycyclohexyl group, an epoxycyclopentyl group and a glycidyl group.
The cycloaliphatic epoxy compound may comprise a difunctional cycloaliphatic epoxy compound. The bifunctional alicyclic epoxy compound is a compound having two alicyclic epoxy groups. The bifunctional alicyclic epoxy compound has a higher glass transition temperature in a homopolymer phase to improve durability by supporting a stacked structure of the polarizer, the adhesive layer, and the optical film, and can increase interfacial adhesion between the polarizer and the optical film by ensuring chemical bonding and good wettability through hydroxyl groups generated during the reaction. The difunctional cycloaliphatic epoxy compound may have a glass transition temperature of 150 ℃ or greater than 150 ℃ in its homopolymer phase, e.g., 150 ℃ to 400 ℃. Within this range, the adhesive composition can prevent cracks from being generated in the polarizer upon thermal shock.
In one embodiment, the difunctional cycloaliphatic epoxy compound may be an epoxycyclohexylmethyl epoxycyclohexane carboxylate compound, an epoxycyclohexane carboxylate compound of an alkylene glycol, an epoxycyclohexylmethyl ester compound of a dicarboxylic acid, an epoxycyclohexylmethyl ether compound of a polyethylene glycol, an epoxycyclohexylmethyl ether compound of an alkylene glycol, a diepoxytrispiraspirio compound, a diepoxymonospirio compound, a vinylcyclohexene diepoxide compound, an epoxycyclopentyl ether compound, or a diepoxycyclodecane compound.
The difunctional cycloaliphatic epoxy compound may comprise at least one selected from the group consisting of: 3, 4-epoxycyclohexylmethyl-3 ',4' -epoxycyclohexanecarboxylate, 3, 4-epoxy-6-methylcyclohexylmethyl-3 ',4' -epoxy-6 ' -methylcyclohexanecarboxylate, bis (3, 4-epoxy-6-methylcyclohexyl) adipate, and 3, 4-epoxycyclohexylmethyl-3 ',4' -epoxycyclohexanecarboxylate-modified epsilon-caprolactone. For example, the difunctional cycloaliphatic epoxy compound may be selected from the group consisting of CELLOXIDE 2021P (DIACEL) and CELLOXIDE 8000(DIACEL), but is not limited thereto.
The bifunctional alicyclic epoxy compound may be present in an amount of 20 parts by weight to 80 parts by weight, preferably 30 parts by weight to 70 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the adhesive composition can prevent embrittlement of the adhesive layer formed therefrom due to an excessive increase in the modulus of the adhesive layer, while ensuring good cuttability. For example, the bifunctional alicyclic epoxy compound may be used in an amount of 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, or the like, based on 100 parts by weight of the epoxy compound and the (meth) acrylate compound, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight or 80 parts by weight.
The bifunctional alicyclic epoxy compound may be present in an amount of 50 parts by weight to 90 parts by weight, preferably 50 parts by weight to 89 parts by weight, relative to 100 parts by weight of the epoxy compound. Within this range, the adhesive composition may exhibit good crack resistance and good adhesive strength to COP film upon thermal shock. For example, the bifunctional alicyclic epoxy compound may be present in an amount of 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89 parts by weight, or 90 parts by weight, relative to 100 parts by weight of the epoxy compound.
As the alicyclic epoxy compound, the adhesive composition may further contain a monofunctional alicyclic epoxy compound and a trifunctional or higher alicyclic epoxy compound. Each of the monofunctional cycloaliphatic epoxy compound and the trifunctional or higher-functional cycloaliphatic epoxy compound may be selected from typical cycloaliphatic epoxy compounds well known to those skilled in the art.
The epoxy compound may further comprise at least one of an aliphatic epoxy compound and a hydrogenated epoxy compound. Each of the aliphatic epoxy compound and the hydrogenated epoxy compound may be selected from typical epoxy compounds well known to those skilled in the art.
The epoxy compound may be present in an amount of 40 to 95 parts by weight, preferably 60 to 90 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. For example, the epoxy compound may be 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, 60 parts by weight, 61 parts by weight, 62 parts by weight, 63 parts by weight, 64 parts by weight, 65 parts by weight, 66 parts by weight, 67 parts by weight, 68 parts by weight, 69 parts by weight, 70 parts by weight, 71 parts by weight, 72 parts by weight, 73 parts by weight, 74 parts by weight, 75 parts by weight, 76 parts by weight, 77 parts by weight, 78 parts by weight, 79 parts by weight, 80 parts by weight, 81 parts by weight, 82 parts by weight, 83 parts by weight, 84 parts by weight, 85 parts by weight, 86 parts by weight, 87 parts by weight, 88 parts by weight, 89, 90, 91, 92, 93, 94, or 95 parts by weight. Within this range, the adhesive composition allows its glass transition temperature Tg to be increased, thereby improving crack resistance at the time of thermal shock and adhesive strength to COP film.
The (meth) acrylate compound may comprise a monofunctional (meth) acrylate compound having at least one hydroxyl group.
The monofunctional (meth) acrylate compound having at least one hydroxyl group is not hindered from a reaction initiated by moisture and therefore it can react stably with light energy without being hindered from a curing reaction initiated by moisture from an adjacent polarizing plate. In addition, the monofunctional (meth) acrylate compound having at least one hydroxyl group can improve the bonding strength and adhesion between the polarizer and the protective film by coupling with chain transfer of the epoxy compound activated by cations during the curing process. The monofunctional (meth) acrylate compound having at least one hydroxyl group may have a glass transition temperature of 0 ℃ or less than 0 ℃ in the homopolymer phase. With the monofunctional (meth) acrylate compound having a glass transition temperature of 0 ℃ or less than 0 ℃ in the homopolymer phase, even with an excess of the epoxy compound having a high glass transition temperature in the homopolymer phase, the adhesive composition can prevent the occurrence of cracks in the polarizing plate due to thermal shock and embrittlement of the adhesive layer by ensuring a suitable modulus at high temperatures. Preferably, the monofunctional (meth) acrylate compound may have a glass transition temperature of-80 ℃ to-10 ℃ in the homopolymer phase.
For example, the monofunctional (meth) acrylate compound having at least one hydroxyl group may include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, or 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, and the like.
The monofunctional (meth) acrylate compound having at least one hydroxyl group may be present in an amount of 5 parts by weight to 60 parts by weight, preferably 10 parts by weight to 40 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the adhesive composition can ensure good adhesion between the polarizer and the protective film while avoiding embrittlement by avoiding an excessive increase in the glass transition temperature Tg when an alicyclic epoxy resin compound is used.
The (meth) acrylate compound may further include a (meth) acrylate compound having a hydrophobic functional group at an ester site of the (meth) acrylate compound. The hydrophobic functional group can prevent the adhesive property of the adhesive layer to the optical film or the polarizing plate from being deteriorated due to external moisture when the optical film is bonded to the polarizing plate through the adhesive composition. Further, in the adhesive composition according to the present invention, the hydrophobic functional group can prevent the distribution of adhesive strength at the interface between the polarizing plate and the adhesive layer or between the optical film and the adhesive layer from being increased due to external moisture. Preferably, the hydrophobic functional group may comprise C10To C20Straight-chain or branched-chain alkyl radicals, such as lauryl, isodecyl, and the like.
The (meth) acrylate compound may be present in an amount of 5 parts by weight to 60 parts by weight, preferably 10 parts by weight to 40 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the adhesive composition can ensure good adhesion between the polarizer and the protective film while avoiding embrittlement by avoiding an excessive increase in the glass transition temperature Tg when an alicyclic epoxy resin compound is used. For example, the (meth) acrylate compound may be present in an amount of 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, 11 parts by weight, 12 parts by weight, 13 parts by weight, 14 parts by weight, 15 parts by weight, 16 parts by weight, 17 parts by weight, 18 parts by weight, 19 parts by weight, 20 parts by weight, 21 parts by weight, 22 parts by weight, 23 parts by weight, 24 parts by weight, 25 parts by weight, 26 parts by weight, 27 parts by weight, 28 parts by weight, 29 parts by weight, 30 parts by weight, 31 parts by weight, 32 parts by weight, 33 parts by weight, 34 parts by weight, 35 parts by weight, 36 parts by weight, 37 parts by weight, 38 parts by weight, 39 parts by weight, 40 parts by weight, 41 parts by weight, 42 parts by weight, 43 parts by weight, 44 parts by weight, 45 parts by weight, 46 parts by weight, 47 parts by weight, 48 parts by weight, 49 parts by weight, 50 parts by weight, 51 parts by weight, 52 parts by weight, or the like, Present in an amount of 53 parts by weight, 54 parts by weight, 55 parts by weight, 56 parts by weight, 57 parts by weight, 58 parts by weight, 59 parts by weight, or 60 parts by weight.
The photoinitiator may comprise at least one of a photoacid generator and a free radical photoinitiator.
The photoacid generator can be an onium salt comprising a cation and an anion. Examples of the cation may include triarylsulfonium such as triphenylsulfonium, diphenyl-4- (phenylthio) phenylsulfonium and diphenyl-4-thiophenoxyphenylsulfonium, and bis [4- (diphenyldihydrothio) phenyl ] sulfonium]And (4) sulfide. An example of an anion can comprise hexafluorophosphate (PF)6 -) Tetrafluoroborate (BF)4 -) Hexafluoroantimonate (SbF)6 -) Hexafluoroarsenate (AsF)6 -) And hexachloroantimonate (SbCl)6 -)。
The photoacid generator may be present in an amount of 0.1 to 10 parts by weight, for example, 1 to 6 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the photoacid generator allows the epoxy compound to be sufficiently cured and can prevent deterioration of adhesive strength and transparency of the adhesive layer and bleeding of the photoacid generator due to residual photoacid generator.
The radical photoinitiator can lower the bs coordinate value of the adhesive layer and can cure the (meth) acrylate compound together with the photoacid generator. The photoinitiator may comprise any typical photoinitiator known in the art. Specifically, the photoinitiator may include at least one selected from the group consisting of phosphorus, triazine, acetophenone, benzophenone, benzoin, and oxime photosensitizers. The color coordinate bs value of the polarizing plate including the adhesive layer formed of the adhesive composition for a polarizing plate according to the present invention may be 3 or less than 3, for example, 0 to 3. Within this range, the polarizing plate can ensure good visibility by avoiding yellow visibility when used in an optical display.
The radical photoinitiator may be present in an amount of 0.1 to 10 parts by weight, for example 1 to 7 parts by weight, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound. Within this range, the radical photoinitiator can ensure sufficient curing of the (meth) acrylate compound and can prevent deterioration of transparency of the adhesive layer and bleeding of the photoacid generator due to the residual radical photoinitiator.
The adhesive composition for the polarizing plate may include a solvent or may be a solvent-free adhesive composition. The solvent-free adhesive composition can minimize the influence on the optical film.
The adhesive composition for the polarizing plate may further include typical additives having inherent functions of the additives, such as an antioxidant, an adhesion promoter, an antistatic agent, a leveling agent, an antifoaming agent, a UV absorber, and the like.
The adhesive composition for the polarizing plate may have a viscosity of 20 cps to 100 cps at 25 ℃. Within this range, the adhesive composition can be easily deposited.
A polarizing plate according to one embodiment of the present invention will be described next.
The polarizing plate includes a polarizer and an optical film formed on one surface of the polarizer, wherein the optical film is bonded to the polarizer through an adhesive layer formed of the adhesive composition for a polarizing plate according to the present invention.
The polarizer may polarize external light that has entered the polarizing plate. The polarizing plate may be formed of a polyvinyl alcohol resin film. In one embodiment, the polarizer may be a polyvinyl alcohol-based polarizer produced by dyeing a polyvinyl alcohol resin film with at least one of iodine and a dichroic dye. In another embodiment, the polarizing plate may be a polyene-based polarizing plate obtained by dehydrating a polyvinyl alcohol resin film. The polarizer may have a thickness of 5 to 100 micrometers, specifically 5 to 50 micrometers. In this thickness range, the polarizer may be used for a polarizing plate.
An optical film may be formed on one or both surfaces of the polarizer to protect the polarizer.
The optical film may comprise at least one selected from the group consisting of: cellulose resins such as Triacetylcellulose (TAC), polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate, cyclic polyolefin resins including amorphous cycloolefin polymers (COP), polycarbonate resins, polyether sulfone resins, polysulfone resins, polyamide resins, polyimide resins, acyclic polyolefin resins, polyacrylate resins including poly (methyl methacrylate), polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins. The optical film can have a thickness of 5 to 200 microns, specifically 10 to 150 microns, more specifically 50 to 120 microns. Within this thickness range, the optical film may be used for a polarizing plate. Preferably, the optical film is a PET film, a COP film, or a TAC film. Preferably, the COP film comprises a COP film produced by solution casting.
The adhesive composition for a polarizing plate according to the present invention may be a photocurable composition. Therefore, the adhesive layer is formed by depositing the adhesive composition on the optical film and stacking the polarizer on the adhesive composition, followed by photocuring the adhesive composition. The adhesive layer can have a thickness of 0.5 microns to 10 microns, for example 1 micron to 10 microns. Within this thickness range, the optical film may be used for a polarizing plate.
An optical display according to one embodiment of the present invention may include a polarizing plate according to an embodiment of the present invention. The optical display may include an adhesive layer formed of the adhesive composition for a polarizing plate according to the present invention. The optical display may be a liquid crystal display, but is not limited thereto.
The invention provides an adhesive composition for a polarizing plate, which can show good adhesive strength for all of a TAC film, a PET film and a COP film.
The present invention provides an adhesive composition for a polarizing plate that can exhibit good adhesive strength to a COP film produced by solution casting.
The present invention provides an adhesive composition for a polarizing plate that can prevent or minimize the occurrence of cracks in a polarizer upon thermal shock.
The present invention provides an adhesive composition for a polarizing plate that can exhibit good adhesive strength for each of a polarizer, a PET film, a COP film, and a TAC film even after being placed under high temperature and high humidity conditions.
The present invention will next be described in more detail with reference to some examples. It should be noted, however, that these examples are provided for illustration only and should not be construed as limiting the invention in any way.
Details of components used in examples and comparative examples are as follows.
A: alicyclic epoxy compounds: cycloaliphatic diepoxide as an alicyclic bifunctional epoxy compound (CELLOXIDE 2021P, Daicel Corporation)
B: aromatic epoxy compound: phenyl glycidyl ether (EX-141, Rice-scale ChemteX Corporation)
C: aromatic epoxy compound: resorcinol diglycidyl ether (EX-201, CamteX corporation)
D: (meth) acrylate compound: acrylic acid 4-hydroxybutyl ester (100%, Osaka Organic Chemistry Industry Ltd.)
E: (meth) acrylate compound: 2-hydroxyethyl acrylate (100%, Osaka organic chemical industry Co., Ltd.)
F: photoacid generators: diphenyl 4- (phenylthio) phenylsulfonium hexafluorophosphate (CPI-100P, San-Apro Kabushiki Kaisha (San-Apro Ltd.))
G: free radical photoinitiator: 1-hydroxy-cyclohexyl-phenyl-ketone (Irgacure-184, BASF GmbH)
H: neopentyl glycol diglycidyl ether: EX-211 (Rex ChemteX)
Example 1
An adhesive composition for an adhesive layer was prepared by mixing 50 parts by weight of (a) an alicyclic epoxy compound, 20 parts by weight of (C) an aromatic epoxy compound, 30 parts by weight of (D) (meth) acrylate compound, 2 parts by weight of (F) a photoacid generator, and 1 part by weight of (G) a radical photoinitiator.
Examples 2 to 8
An adhesive composition for an adhesive layer was prepared in the same manner as in example 1, except that the kind and content of each component were changed as listed in table 1 (unit: parts by weight).
Comparative examples 1 to 6
An adhesive composition for an adhesive layer was prepared in the same manner as in example 1, except that the kind and content of each component were changed as listed in table 1 (unit: parts by weight).
< Table 1>
| A | B | C | D | E | F | G | H | |
| Example 1 | 50 | - | 20 | 30 | - | 2 | 1 | - |
| Example 2 | 50 | 10 | 10 | 30 | - | 5 | 1 | - |
| Example 3 | 70 | - | 10 | 20 | - | 3 | 3 | - |
| Example 4 | 30 | 10 | 20 | 40 | - | 2 | 1 | - |
| Example 5 | 40 | 10 | 10 | 40 | - | 2 | 1 | - |
| Example 6 | 30 | 15 | 15 | 20 | 20 | 2 | 1 | - |
| Example 7 | 60 | 5 | 20 | 15 | - | 4 | 1 | - |
| Example 8 | 60 | 5 | 25 | - | 10 | 1 | 1 | - |
| Comparative example 1 | 15 | - | - | 85 | - | 2 | 1 | - |
| Comparative example 2 | 60 | - | 40 | - | - | 2 | - | - |
| Comparative example 3 | 65 | - | 5 | 30 | - | 2 | 1 | - |
| Comparative example 4 | 35 | - | 35 | 30 | - | 2 | 1 | - |
| Comparative example 5 | 50 | - | - | 30 | - | 2 | 1 | 20 |
| Comparative example 6 | 50 | 20 | - | 30 | - | 2 | 1 | - |
The adhesive compositions prepared in examples and comparative examples were evaluated according to the characteristics listed in table 2, and the evaluation results are shown in table 2.
(1) Adhesive strength: a 60 μm-thick polyvinyl alcohol film (degree of saponification: 99.5, degree of polymerization: 2000) was immersed in a 0.3% iodine solution to dye the polyvinyl alcohol film and then stretched to 5.7 times its original length. Next, the stretched polyvinyl alcohol film was immersed in a 3% boric acid solution and a 2% potassium iodide solution for color correction and then dried at 50 ℃ for 4 minutes, thereby preparing a polarizing plate (thickness: 23 μm).
A TAC Film (thickness: 60 μm, Fuji Film co., Ltd.) was used as the polarizer protective Film. The TAC film was saponified and then corona treated at 250 mj/cm.
After one surface of the COP film 1 was subjected to corona treatment at 250 mj/cm, the COP film 1 (thickness: 40 μm, manufactured by solution casting, Konica corporation (Konica co., Ltd.)) was used as a polarizer protective film.
After one surface of the COP film 2 was subjected to corona treatment at 250 mj/cm, the COP film 2(Zeoner, thickness: 50 μm, manufactured by melt casting, ruing co., Ltd.) was used as a polarizing plate protective film.
The polarizing plate was manufactured by depositing an adhesive composition for an adhesive layer to a thickness of 2 μm on each of the TAC film and the COP film 1, attaching the prepared polarizer thereto under conditions of a temperature of 22 ℃ to 25 ℃ and an RH of 20% to 60%, followed by photocuring using a metal halide lamp at 400 milliwatts per square centimeter and 1000 millijoules per square centimeter.
Each of the manufactured polarizing plates was cut into a size of 100 mm × 25 mm (length × width) and a cutting blade was inserted into a gap between the optical film and the polarizer at one end of the polarizing plate. Polarizing plates that did not allow the cutting blade to be inserted into the gap were evaluated ∈ polarizing plates that allowed the cutting blade to be slightly inserted into the gap were evaluated ≈ polarizing plates that allowed the cutting blade to be slightly inserted into the gap and suffered from optical film breakage during the insertion of the cutting blade were evaluated Δ, and polarizing plates that allowed the cutting blade to be easily inserted into the gap were evaluated as X.
The same evaluation was performed using TAC film and COP film 2.
(2) Water resistance: the polarizing plate was manufactured by the same method as in (1). Each of the manufactured polarizing plates was cut into a size of 50 mm × 50 mm and immersed in a thermostat containing water at 60 ℃ for 6 hours. The water resistance was evaluated based on the length of bleaching at one end of the polarizing plate. No bleaching was evaluated ∈, a bleaching length of less than 2 mm was evaluated as o, and a bleaching length of 2 mm or more was evaluated as X.
(3) Crack length (unit: mm) at thermal shock: the cracking resistance of the polarizing plate upon thermal shock was evaluated. The polarizing plate was manufactured by the same method as in (1). Each of the manufactured polarizing plates cut into a size of 50 mm × 50 mm was laminated on a glass plate, thereby preparing a sample. The samples were subjected to 100 thermal shock cycles, one by placing the polarizer plate at-40 ℃ for 30 minutes and heating the polarizer plate from-40 ℃ to 85 ℃, followed by placing the polarizer plate at 85 ℃ for 30 minutes. Cracks in the polarizer generated in the MD were observed with the naked eye through the sample under a fluorescent lamp placed in the reflective mode or the backlight mode. The maximum length of the crack was measured to evaluate crack resistance.
(4) bs: each of the polarizing plates manufactured in examples and comparative examples was cut into samples having a size of 30 mm × 30 mm. The sample was placed in a measuring instrument (V-7100, Jasco co., Ltd.) such that the COP film 1 or the COP film 2 of the sample faced the light emitting surface. After mounting the sample, the measuring instrument was driven to measure the MD bs value and TD bs value of the polarizing plate, and then the bs value of the polarizing plate was calculated according to the following formula: bs value [ (MD bs value + TD bs value)/2 ].
< Table 2>
As shown in table 2, the adhesive composition for a polarizing plate according to the present invention exhibited good adhesive strength for all of the TAC film and the COP film. In particular, the adhesive composition according to the present invention exhibits good adhesive strength not only to a COP film produced by melt casting but also to a COP film produced by solution casting. In addition, the adhesive composition according to the present invention can prevent or minimize the generation of cracks in the polarizer upon thermal shock, and exhibits good water resistance.
In contrast, the polarizing plate of comparative example 2 prepared using the adhesive composition not containing the (meth) acrylate compound suffered from deterioration in adhesion between the PVA film and the protective film. In addition, the polarizing plates of comparative examples 1, 3, and 4 prepared using an adhesive composition containing a glycidyl ether of an aromatic compound having at least two hydroxyl groups in an amount outside the content range according to the present invention suffer from deterioration in crack resistance upon thermal shock and exhibit lower adhesive strength to a COP film produced by solution casting. The polarizing plate of comparative example 5, which was prepared using the adhesive composition containing aliphatic diglycidyl ether instead of aromatic diglycidyl ether, exhibited lower adhesive strength to the COP film produced by casting. The polarizing plate of comparative example 6, which was prepared using an adhesive composition containing monoglycidyl ether of an aromatic compound instead of aromatic diglycidyl ether, exhibited lower adhesive strength for COP films.
It is to be understood that various modifications, changes, alterations, and equivalent embodiments may be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (9)
1. An adhesive composition for a polarizing plate comprising:
an epoxy compound;
(meth) acrylate compounds; and
a photo-initiator,
wherein the epoxy compound comprises an alicyclic epoxy compound and an aromatic epoxy compound,
the aromatic epoxy compound includes 10 to 30 parts by weight of a polyglycidyl ether of an aromatic compound, wherein the polyglycidyl ether of an aromatic compound includes a diglycidyl ether of an aromatic compound having at least two phenolic hydroxyl groups, relative to 100 parts by weight of the epoxy compound and the (meth) acrylate compound,
wherein the aromatic epoxy compound further comprises a monoglycidyl ether of an aromatic compound,
wherein the alicyclic epoxy compound includes 20 to 80 parts by weight of a bifunctional alicyclic epoxy compound with respect to 100 parts by weight of the epoxy compound and the (meth) acrylate compound,
wherein a polarizer of a polarizing plate having an adhesive layer formed of the adhesive composition for a polarizing plate has a maximum crack length in a machine direction of 3 mm or less than 3 mm when measured after 100 thermal shock cycles, wherein one thermal shock cycle is performed by placing the polarizing plate at-40 ℃ for 30 minutes and heating the polarizing plate from-40 ℃ to 85 ℃, followed by placing the polarizing plate at 85 ℃ for 30 minutes.
2. The adhesive composition for a polarizing plate according to claim 1, wherein the polyglycidyl ether of an aromatic compound comprises at least one of resorcinol diglycidyl ether, hydroquinone diglycidyl ether, and catechol diglycidyl ether.
3. The adhesive composition for a polarizing plate according to claim 1, wherein the polyglycidyl ether of an aromatic compound is present in an amount of 10 parts by weight to 50 parts by weight relative to 100 parts by weight of the epoxy compound.
4. The adhesive composition for a polarizing plate according to claim 1, wherein the monoglycidyl ether of an aromatic compound comprises at least one of phenyl glycidyl ether, tolyl glycidyl ether, and nonylphenyl glycidyl ether.
5. The adhesive composition for a polarizing plate according to claim 1, wherein the (meth) acrylate compound comprises a monofunctional (meth) acrylate compound having at least one hydroxyl group.
6. The adhesive composition for a polarizing plate according to claim 1, wherein the (meth) acrylate compound is present in an amount of 5 to 60 parts by weight with respect to 100 parts by weight of the epoxy compound and the (meth) acrylate compound.
7. A polarizing plate comprising a polarizer and an optical film formed on at least one surface of the polarizer,
wherein the optical film is stacked on the polarizing plate through an adhesive layer formed of the adhesive composition for a polarizing plate according to any one of claims 1 to 6.
8. The polarizing plate of claim 7, wherein the polarizing plate has a color coordinate bs value of 3 or less than 3.
9. An optical display comprising the polarizing plate of claim 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170156795A KR20190059138A (en) | 2017-11-22 | 2017-11-22 | Adhesive composition for polarizing plate, polarizing plate and optical display apparatus |
| KR10-2017-0156795 | 2017-11-22 |
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| CN109810637A CN109810637A (en) | 2019-05-28 |
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| CN112029420B (en) * | 2020-09-07 | 2022-07-01 | 江苏泰特尔新材料科技股份有限公司 | UV curing adhesive for polarizing plate and preparation method and application thereof |
| CN112011276B (en) * | 2020-09-07 | 2022-06-17 | 山东泰特尔新材料科技有限公司 | UV curing adhesive-based polarizing plate and preparation method thereof |
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| KR101072371B1 (en) * | 2010-09-20 | 2011-10-11 | 주식회사 엘지화학 | Adhesive for polarizing plate and polarizing plate comprising the same |
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- 2017-11-22 KR KR1020170156795A patent/KR20190059138A/en not_active IP Right Cessation
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| KR20190059138A (en) | 2019-05-30 |
| CN109810637A (en) | 2019-05-28 |
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