WO2009091171A2 - Pressure-sensitive adhesive composition, protective film, polarizer and liquid crystal display comprising the same - Google Patents

Pressure-sensitive adhesive composition, protective film, polarizer and liquid crystal display comprising the same Download PDF

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Publication number
WO2009091171A2
WO2009091171A2 PCT/KR2009/000178 KR2009000178W WO2009091171A2 WO 2009091171 A2 WO2009091171 A2 WO 2009091171A2 KR 2009000178 W KR2009000178 W KR 2009000178W WO 2009091171 A2 WO2009091171 A2 WO 2009091171A2
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WO
WIPO (PCT)
Prior art keywords
meth
sensitive adhesive
pressure
adhesive composition
acrylate
Prior art date
Application number
PCT/KR2009/000178
Other languages
French (fr)
Other versions
WO2009091171A3 (en
Inventor
No Ma Kim
Jae Gwan Lee
An Na Lee
Original Assignee
Lg Chem, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lg Chem, Ltd. filed Critical Lg Chem, Ltd.
Priority to EP09702082.0A priority Critical patent/EP2231807B1/en
Priority to CN2009801021445A priority patent/CN101910346B/en
Priority to US12/812,593 priority patent/US10100234B2/en
Priority to JP2010542181A priority patent/JP5534457B2/en
Publication of WO2009091171A2 publication Critical patent/WO2009091171A2/en
Publication of WO2009091171A3 publication Critical patent/WO2009091171A3/en

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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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/202—LCD, i.e. liquid crystal displays
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1811—C10or C11-(Meth)acrylate, e.g. isodecyl (meth)acrylate, isobornyl (meth)acrylate or 2-naphthyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1812—C12-(meth)acrylate, e.g. lauryl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
    • C08F220/281—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing only one oxygen, e.g. furfuryl (meth)acrylate or 2-methoxyethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
    • C08F220/285—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
    • C08F220/286—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/43—Compounds containing sulfur bound to nitrogen
    • 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
    • C09J2301/302—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 the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by chemical composition
    • C09K2323/035—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C09K2323/057—Ester polymer, e.g. polycarbonate, polyacrylate or polyester
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/05—Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
    • C09K2323/059—Unsaturated aliphatic polymer, e.g. vinyl
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2848—Three or more layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
    • Y10T428/2852—Adhesive compositions
    • Y10T428/2857—Adhesive compositions including metal or compound thereof or natural rubber

Definitions

  • the present invention relates to an acrylic pressure-sensitive adhesive composition, and more particularly, to an acrylic pressure-sensitive adhesive composition capable of showing an excellent anti-static performance, and solving a transferring problem of additives and a problem concerning a balance of low-rate and high-rate peel strength, by comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt, and a hydrophobic monomer and b) a metal salt.
  • a protective film is used for protecting the surface of metal products or plastic sheets.
  • an acrylic adhesive has been widely used due to its weather-resistance and transparency.
  • an adhesive in which a copolymer comprising an alkyl (meth)acrylate and a crosslinkable monomer is crosslinked with polyisocyanate compound, melamine compound or epoxy compound, has been mainly used.
  • static electricity means frictional electrification generated by rubbing two objects or peeling electrification generated by separating two adhered objects.
  • Such static electricity may cause suction of foreign substances such as dust, electrostatic destruction of a device, malfunction of a instrument, fire, and so forth.
  • the demand of liquid crystal displays (LCDs) has been remarkably increased due to wide spread of computers, expansion of liquid crystal TVs or multi-functional mobile phones, etc.
  • the size of the LCDs increases, the size of a polarizer used in manufacturing of the LCD device also increases.
  • static electricity is excessively generated during peeling of a protective film adhered to the polarizer, and then affecting the orientation of liquid crystal in the LCD device and thus causing image detect.
  • the anti-static property is needed for the adhesive itself to prevent generation of static electricity.
  • Conventional methods for providing the anti-static property of an adhesive include a method of adding a substance having a conductive component such as a conductive metal powder or a carbon particle to resin and a method of adding a surfactant-type ionic or nonionic substance.
  • a large amount of additives has to be added and thus the additive is migrated to the surface of the pressure-sensitive adhesive, and then degrading a pressure-sensitive adhesive property.
  • Japanese Patent Laid-Open Publication No. 1993-140519 discloses a method for suppressing static electricity through an addition of ethylene oxide-modified phthalic acid dioctyl plasticizer.
  • this method has disadvantages that the plasticizer is migrated to the surface of a polarizer.
  • Korean Laid-Open Patent Publication No. 2004-30919 discloses a method for suppressing static electricity by adding an organic salt, but this method needs a large amount of expensive organic salt.
  • Korean Laid-Open Patent Publication No. 2006-128659 discloses a method using a chelating agent capable of forming a bond with a metal salt, and alkali metal salt. However, this method is also disadvantageous in that low-rate peel strength is reduced due to a large amount of additives.
  • an object of the present invention is to provide a pressure-sensitive adhesive composition capable of maintaining an excellent workability and durability superior anti-static property.
  • Another object of the present invention is to provide a protective film, a polarizer and a liquid crystal display comprising the adhesive composition.
  • the present invention provides an pressure-sensitive adhesive composition
  • an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt and a hydrophobic monomer and b) a metal salt.
  • the present invention also provides a protective film including a substrate and a pressure-sensitive adhesive layer that is formed on one or both sides of the substrate, and contains the acrylic pressure-sensitive adhesive composition according to the present invention.
  • the present invention also provides a polarizer comprising a polarizing film or a polarizing device; and a pressure-sensitive adhesive layer that is formed on one or both sides of the film or device, and contains the pressure-sensitive adhesive composition according to the present invention.
  • the present invention also provides a liquid crystal display comprising a liquid crystal panel in which a polarizer bonded to the protective film according to present invention is attached one or both sides of a liquid crystal cell.
  • the pressure-sensitive adhesive composition of the present invention is capable of showing an excellent anti-static property, with maintaining a good workability and durability adding a separate chelating agent.
  • the pressure-sensitive adhesive composition when it is used in a surface protective film for a polarizer, can effectively prevent generation of static electricity after durability evaluation, and exhibits superior balance of low-rate peel strength and high-rate peel strength.
  • the present invention relates to a pressure-sensitive adhesive composition
  • a pressure-sensitive adhesive composition comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt and a hydrophobic monomer; and b) a metal salt.
  • an acrylic copolymer used in the present invention is not specially limited, as long as it can be used as an adhesive in the art.
  • the acrylic copolymer may comprise i) 0.8-5 parts by weight of a (meth)acrylic acid ester monomer having an alkylene oxide group;
  • the (meth)acrylic acid ester monomer having an alkylene oxide group is capable of chelating with a metal salt.
  • the specific kinds of the (meth)acrylic acid ester monomer is not specially limited.
  • the (meth)acrylic acid ester monomer may be a compound represented by the following formula 1:
  • R 1 represent a hydrogen or an alkyl group having 1 to 4 carbon atom(s)
  • m is an integer of 1 to 4
  • n is an integer of 1 to 10
  • R 2 represents an alkyl group having 1 to 6 carbon atom(s) or an aryl group having 5 to 12 carbon atoms.
  • the compound represented by the above Formular 1 it is preferable to use one or more selected from the group consisting of alkoxy dialkyleneglycol (meth)acrylic acid ester, alkoxy trialkyleneglycol (meth)acrylic acid ester, alkoxy polyalkyleneglycol (meth)acrylic acid ester, phenoxy dialkyleneglycol (meth)acrylic acid ester, phenoxy trialkyleneglycol (meth)acrylic acid ester and phenoxy polyalkyleneglycol (meth)acrylic acid ester.
  • the alkoxy may be an alkoxy having 1 to 6 carbon atom(s), and more concretely, it may be methoxy, ethoxy or butoxy.
  • the alkyleneglycol may be an alkyleneglycol having 1 to 4 carbon atom(s), and more concretely, it may be ethylene glycol or propylene glycol.
  • the acrylic copolymer may comprise the monomer having a functional group capable of chelating with a metal salt in an amount of 0.8 to 5 parts by weight, and preferably 1 to 5 parts by weight, and more preferably 2 to 4 parts by weight, based on 100 parts by weight of the copolymer.
  • a functional group capable of chelating with a metal salt in an amount of 0.8 to 5 parts by weight, and preferably 1 to 5 parts by weight, and more preferably 2 to 4 parts by weight, based on 100 parts by weight of the copolymer.
  • the hydrophobic monomer of the above ii) is not specially limited.
  • a (meth)acrylic acid ester monomer having an alkyl group of at least 10 carbon atoms, and more preferably a (meth)acrylic acid ester monomer having alkyl group of 10 to 15 carbon atoms can be used.
  • the hydrophobic monomer it is preferable to use one selected from or a mixture of two or more selected from the group consisting of isobonyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, (meth)acryl acid, and the like.
  • the acrylic copolymer may comprise the hydrophobic monomer in an amount of 1 to 18 parts by weight, and preferably 2 to 10 parts by weight, and more preferably 3 to 8 parts by weight, relative to 100 parts by weight of the copolymer.
  • the content of the monomer is less than 1 parts by weight, it is apprehended that a durability of the adhesive is deteriorated, whereas when the content is more than 18 parts by weight, it is apprehended that the low-rate peel strength and/or high-rate peel strength is deteriorated, or wettability is decreased.
  • the acrylic copolymer may further comprises:
  • alkyl (meth)acrylate having an alkyl group of 1 to 9 carbon atom(s); and iv) 0.1 to 10 parts by weight of a monomer containing a crosslinkable functional group.
  • alkyl (meth)acrylate having an alkyl group of 1 to 9 carbon atom(s) it is preferable to use one selected from or a mixture of two or more selected from a group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, n-octyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and the like.
  • 2-ethylhexyl (meth)acrylate may be used as the alkyl (meth)acrylate, but it is not limited thereto.
  • the acrylic copolymer may comprise the alkyl (meth)acrylate monomer in an amount of 80 to 95 parts by weight, based on 100 parts by weight of the copolymer.
  • the content of the monomer is less than 80 parts by weight, it is apprehended that an adhesive property in early stage is decreased, whereas when the content is more than 95 parts by weight, it is apprehended that a durability is decreased.
  • the monomer containing a crosslinkable functional group may function as imparting cohesive strength and adhesive strength by reacting with a crosslinking agent.
  • An example of the monomer containing a crosslinkable functional group comprises a monomer containing hydroxyl group, a monomer containing a carboxy group and/or a monomer containing nitrogen.
  • a monomer containing a crosslinkable functional group comprises a monomer containing hydroxyl group, a monomer containing a carboxy group and/or a monomer containing nitrogen.
  • one or two or more of the foregoing monomers may be used.
  • An example of usable monomers containing a hydroxyl group herein may include, but is not limited to, one or two or more species of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethyleneglycol (meth)acrylate or 2-hydroxypropyleneglycol (meth)acrylate.
  • An example of usable monomers containing a carboxyl group herein may include, but is not limited to, one or two or more species of (meth)acrylic acid, 2-(meth)acryloyloxy acetic acid, 3-(meth)acryloyloxy propylic acid, 4-(meth)acryloyloxy butylic acid, acrylic acid dimer, itaconic acid, maleic acid and maleic anhydride.
  • An example of usable monomers containing nitrogen herein may include, but is not limited to, one or two or more species of (meth)acrylamide, N-vinyl pyrolidone and N-vinyl caprolactam.
  • the acrylic copolymer may comprise the monomer containing a crosslinkable functional group in an amount of 0.1 to 10 parts by weight, and preferably 0.5 to 10 parts by weight, relative to 100 parts by weight of the copolymer.
  • a crosslinkable functional group in an amount of 0.1 to 10 parts by weight, and preferably 0.5 to 10 parts by weight, relative to 100 parts by weight of the copolymer.
  • a co-monomer having high glass transition temperature may be comprised in the acrylic copolymer as an arbitrary component.
  • An example of usable co-monomer may include, but it is not limited to, a compound represented by the following Formular 2:
  • R 3 , R 4 and R 5 represents independently hydrogen or alkyl
  • R 6 represents cyano
  • phenyl unsubstituted or substituted with alkyl acetyloxy
  • COR 7 where R 7 represents amino unsubstituted or substituted with alkyl or alkoxyalkyl; or glycidyloxy.
  • alkyl or alkoxy means alkyl or alkoxy having 1 to 8 carbon atoms, and is, preferably, methyl, ethyl, methoxy, ethoxy, propoxy or butoxy.
  • the specific kind of monomer represented by the above Formula 1 may include, but is not limited to, one or two or more of nitrogen-containing monomers such as (meth)acrylonitrile, (meth)acrylamide, N-methyl (meth)acrylamide or N-butoxy methyl (meth)acrylamide; styrene monomer such as styrene or methyl styrene; glycidyl (meth)acrylate; or carbonic acid vinyl ester such as vinyl acetate, and the like.
  • the co-monomer as above is contained in the present acrylic copolymer, the content is, preferably, 20 parts by weight or less, based on 100 parts by weight of the acrylic copolymer. If said content is in excess of 20 parts by weight, it is apprehended that flexibility and/or peel force of the pressure-sensitive adhesive is lowered.
  • the method for preparing the acrylic copolymer is not particularly restricted.
  • it can be prepared through general methods such as solution polymerization, photo-polymerization, bulk polymerization, suspension polymerization, or emulsion polymerization.
  • solution polymerization is carried out at a polymerization temperature of 50 to 140°C by mixing an initiator in a state that each monomer is homogeneously mixed.
  • a usual initiator for example, an azo-based polymerization initiator such as azo-bisisobutyronitrile or azobiscyclohexanecarbonitrile; and/or a peroxide such as benzoyl peroxide or acetyl peroxide may be included.
  • an azo-based polymerization initiator such as azo-bisisobutyronitrile or azobiscyclohexanecarbonitrile
  • a peroxide such as benzoyl peroxide or acetyl peroxide
  • the weight-average molecular weight of the acrylic copolymer may be controlled considering the heat-resistance, peel strength and/or coating efficiency and it is not specially limited.
  • the weigh-average molecular weight of the copolymer may be 200,000 to 1,000,000, and preferably is 300,000 to 8,500,000.
  • the metal salt may comprise a metal cation and/or anion that can be chelated with the monomer having a functional group capable of chelating.
  • the metal salt is preferably a compound in which a metal ion can be easily dissociated from the salt when the compound is mixed with a solvent or the copolymer having a functional group capable of chelating. Also, it is preferable that the metal ion has small ionic radius and low dissociation energy.
  • the metal salt can be comprised in an amount of 0.001 to 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer.
  • the content of metal salt is less than 0.001 parts by weight, it is apprehended that the anti-static performance is degraded, whereas when the content is more than 10 parts by weight, it is apprehended that the endurance reliability may decrease due to low cohesive strength.
  • the usable metal salt herein may comprises, but is not limited to, one or more metal cation selected from the group consisting of lithium, sodium, potassium, magnesium, calcium, barium and cesium; and one or more anion selected from the group consisting of Cl - , Br - , I - , BF 4 - , PF 6 - , AsF - , ClO 4 - , NO 2 - , CO 3 - , N(CF 3 SO 2 ) 2 - , N(CF 3 CO) 2 - , N(C 2 F 5 SO 2 ) 2 - , N(C 2 F 5 CO) 2 - , N(C 4 F 9 SO 2 ) 2 - , C(CF 3 SO 2 ) 3 - and CF 3 SO 3 - .
  • the acrylic pressure-sensitive adhesive composition according to the present invention may additionally comprise a multi-functional crosslinking agent.
  • the multi-functional crosslinking agent has a function of increasing cohesion of the adhesive by reacting with the crosslinkable functional group contained in the acrylic copolymer.
  • cross-linking agent which may be used herein is not particularly restriced, and may include conventional ones such as an isocyanate compound, an epoxy compound, an aziridine compound and a metal chelate compound.
  • isocyanate compound includes tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethylxylene diisocyanate, naphthalene diisocyanate and a reaction product of any one of the foregoing with polyol (ex.
  • an example of the epoxy compound includes ethyleneglycol diglycidylether, triglycidylether, trimethylolpropane triglycidylether, N,N,N'N'-tetraglycidyl ethylenediamine and glycerin diglycidylether;
  • an example of the aziridine compound include N,N'-toluene-2,4-bis(1-aziridinecarboxamide), N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxamide), triethylene melamine, bisisophthaloyl-1-(2-methylaziridine) and tri-1-aziridinylphosphine oxide.
  • an example of the metal chelate compound includes compound in which multivalent metal such as aluminum, iron, zinc, tin, titan, antimony, magnesium and/or vanadium is being chelated to acetyl acetone or ethyl acetoacetate.
  • multivalent metal such as aluminum, iron, zinc, tin, titan, antimony, magnesium and/or vanadium
  • acetyl acetone or ethyl acetoacetate acetyl acetone or ethyl acetoacetate.
  • one or two or more of the forgoing may be used alone or in a mixture thereof.
  • the content of multi-functional crosslinking agent is preferably 0.1 - 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer.
  • the cohesive strength of the pressure-sensitive adhesive is superior, a problem in pressure-sensitive adhesion durability such as bubbles or exfoliation does not occur, and lifting does not occur, thereby providing superior endurance reliability.
  • the acrylic pressure-sensitive adhesive composition according to the present invention may additionally comprise a silane coupling agent and/or tackifier.
  • the silane coupling agent has a function of improving adhesion stability and thus improving heat resistance/moisture resistance when the acrylic pressure-sensitive adhesive is adhered to a glass substrate.
  • the silane coupling agent serves to be of help to enhances adhesion reliability when it is left for a long time under high temperature and high humidity.
  • the silane coupling agent may use one selected from or a mixture of at least two selected from a group consisting of ⁇ -glycydoxypropyl trimethoxysilane, ⁇ -glycydoxypropyl methyldiethoxysilane, ⁇ -glycydoxypropyl triethoxysilane, 3-mercaptopropyl trimethoxysilane, vinyl trimethoxysilane, vinyl triethoxysilane, ⁇ -methacryloxypropyl trimethoxysilane, ⁇ -methacryloxypropyl triethoxysilane, ⁇ -aminopropyl trimethoxysilane, ⁇ -aminopropyl triethoxysilane, 3-isocyanatepropyl triethoxysilane, ⁇ -acetoacetatepropyl trimethoxysilane, and the like.
  • the content of silane coupling agent is preferably 0.005 5 parts by weight, relative to 100 parts by weight of the acrylic copolymer.
  • adhesion stability and adhesion reliability are enhanced under high temperature and high humidity.
  • the tackifier resin has a function of controlling the adhesive performance of the acrylic pressure-sensitive adhesive.
  • the tackifier resin may use one selected from or a mixture of at least two selected from a group consisting of (hydrogenated) hydrocarbon resin, (hydrogenated) rosin resin, (hydrogenated) rosin ester resin, (hydrogenated) terpene resin, (hydrogenated) terpene penol resin, polymerized rosin resin, polymerized rosin ester resin, and the like.
  • the content of tackifier resin is preferably 1 to 100 parts by weight, relative to 100 parts by weight of the acrylic copolymer. When the content is in that range, the compatibility and cohesive strength of the pressure-sensitive adhesive can be enhanced.
  • the acrylic pressure-sensitive adhesive composition according to the present invention may additionally comprise an additive such as acrylic low-molecular-weight substances, epoxy resin, curing agents, UV stabilizers, antioxidants, coloring agents, reinforcing agents, fillers, antifoaming agents, surfactants, plasticizer, or organic salts.
  • an additive such as acrylic low-molecular-weight substances, epoxy resin, curing agents, UV stabilizers, antioxidants, coloring agents, reinforcing agents, fillers, antifoaming agents, surfactants, plasticizer, or organic salts.
  • the acrylic pressure-sensitive adhesive composition according to the present invention can be widely used without limitation, such as for industrial sheets, particularly protective films, reflective sheets, structural pressure-sensitive adhesive sheets, photographic pressure-sensitive adhesive sheets, lane marking pressure-sensitive adhesive sheets, optical pressure-sensitive adhesive products, or pressure-sensitive adhesives for electronic components.
  • the pressure-sensitive adhesive composition can also be applied to equivalent fields using same principles such as multi-layer laminate products, i.e., general industrial pressure-sensitive adhesive sheet products, medical patches, heat activated pressure sensitive adhesives, or the like.
  • the present invention also provides a protective film including:
  • a pressure-sensitive adhesive layer that is formed on one or both sides of the substrate, and contains the pressure-sensitive adhesive composition according to the present invention.
  • the protective film can be effectively used for protecting an optical film, preferably the surface of a polarizer.
  • the substrate film which is not particularly limited, may be a cellulose film, polyester film such as polycarbonate, or polyethylene terephthalate; a poly ether film such as polyether sulphone; or a polyolefine film such as polyethylene film, polypropylene film, polyolefin film having cyclo or norbornene structure, or ethylene-propylene copolymer.
  • the substrate may have a single layer or two or more laminated layers, and its thickness may be properly selected depending on its application, but is preferably 5 ⁇ m to 500 ⁇ m, and more preferably 15 ⁇ m to 100 ⁇ m.
  • the substrate film may be treated with surface-treatment or primer-treatment on one side or both sides to enhance the adherent property between the substrate and the pressure-sensitive adhesive, and may further include an anti-static layer or an anti-fouling layer.
  • a method of forming the pressure-sensitive adhesive layer on the substrate as above is not particularly restricted, and, for example a method in whiche the composition or coating liquid is coated and hardened on said substrate with Bar Coater and the like, or a method in which the composition or coating liquid is coated and dryed on the surface of releasable substrate and then, the prepared adhesive layer is transferred to the surface of the substrate.
  • the thickness of the adhesive layer may be 2 ⁇ m to 100 ⁇ m, and preferably 5 ⁇ m to 50 ⁇ m.
  • the gel content (crosslinking density) as represented in General Formula 1 below is preferably 50% to 95%.
  • A represents weight of a pressure-sensitive adhesive composition
  • B represents dry weight of insoluble content after depositing the pressure-sensitive adhesive composition in ethyl acetate at ambient temperature for 48 hours.
  • said gel content is less than 50%, or in excess of 95%, it is apprehended that the endurance reliability under high temperature and/or high humidity conditions is lowered.
  • the present invention also provides a polarizer including:
  • a pressure-sensitive adhesive layer that is formed on one or both side of the polarizing film or polarizing device, and contains the acrylic pressure-sensitive adhesive composition according to the present invention.
  • a polarizing film or polarizing device constituting said polarizer of the present invention is not particularly restricted.
  • a film obtained by containing a polarizing component such as iodine or dichroic dye into polyvinyl alcohol resin film, and elongating the resulting product may be used as said polarizing film.
  • Said polyvinyl alcohol resin may comprise polyvinyl alcohol, polyvinyl formal, polyvinyl acetal and hydrolysate of ethylene-vinyl acetate copolymer, and the like.
  • the thickness of said polarizing film is also not particularly restricted. It may be formed in a usual thickness.
  • the polarizer may be formed as a multilayer film, wherein protective films, such as a cellulose film, for example, triacetyl cellulose; a polyester film, for example a polycarbonate film or a polyethylene terephthalate; a polyether sulphone film; and/or a polyolefin film, for example, polyethylene film, polypropylene film, polyolefin film having cyclo or norbornene structure, or ethylene-propylene copolymer, are laminated on one or both sides of the polarizing film or device.
  • the thickness of these protective films is also not particularly restricted. It may be formed in a usual thickness.
  • the present polarizer may further comprise one or more functional layers selected from the group consisting of protective layer, reflecting layer, anti-glare layer, phase difference plate, compensation film for wide view angle, and brightness enhancing film.
  • a thickness and crosslinking density are not particularly restricted.
  • the same method, thickness or crosslinking density as described in the protective film can be applied.
  • the present invention further provides a liquid crystal display comprising a liquid crystal panel in which a polarizer bonded to the protective film of the present invention is attached one or both sides of a liquid crystal cell.
  • liquid crystal cell constituting the liquid crystal display of the present invention as above, is not particularly restricted, and includes all general liquid crystal cells such as TN (Twisted Neumatic), STN (Super Twisted Neumatic), IPS (In Plane Switching) or VA (Vertical Alignment).
  • TN Transmission Neumatic
  • STN Super Twisted Neumatic
  • IPS In Plane Switching
  • VA Very Alignment
  • Specific kind of other construction included in the liquid crystal display of the present invention and process for preparing the same is not particularly restricted, and general constructions in this field may be selected and used without limitation.
  • EHA 2-ethylhexyl acrylate
  • lauryl acrylate 2 parts by weight of methoxy triethylene glycol acrylate
  • HOA 2-hydroxyethylacrylate
  • 100 parts by weight of ethyl acetate (EAc) was added thereto as a solvent.
  • nitrogen gas was purged for 60 minutes.
  • the temperature was kept at 70°C, and 0.1 parts by weight of azobis(2-methylbutyronitrile)(Wako, V-59) as a initiator was added thereto and reacted for 6 hours.
  • the resulting product was diluted with ethyl acetate (EAc) to prepare an acrylic copolymer having a solid content of 44 % by weight, a weight average molecular weight of 580,000, and a molecular weight distribution of 7.0.
  • EAc ethyl acetate
  • the 100 parts by weight of the acrylic copolymer prepared in Preparation Example 1, 5.0 parts by weight of a prepolymer of hexamethylenediisocyanate as a crosslinking agent, and 0.1 parts by weight of lithiumtrifluoromethanesulfoneimid (LiN(CF 3 SO 2 ) 2 ) as a metal salt were added.
  • This mixture was diluted in a proper concentration, homogeneously mixed, coated on one side of a 2-axis polyethyleneterephthalate film having a thickness of 38 ⁇ m and dried, thereby preparing a 20 ⁇ m homogeneous pressure-sensitive adhesive layer.
  • a releasing film was laminated on the pressure-sensitive adhesive layer coated on the one side of the polyethyleneterephthalate film and the product was kept for 4 days at a temperature of 23°C and a humidity of 55% for sufficient aging.
  • the thus prepared protective film was cut into proper sizes, and adhered onto a treacetyl cellulose surface (TAC film, Fusi Film Co. of Japan) and an anti-glare film (AG TAC, DNP Co. of Japan) of the polarizer for evaluation.
  • the adhesive layer prepared in Examples and Comparative Examples was attached onto a treacetyl cellulose surface (TAC film, Fusi Film Co. of Japan) and an anti-glare film (AG TAC, DNP Co. of Japan) by using a roller of 2kg on the basis of JIS Z 0.27, and was kept at a temperature of 23 C and a relative humidity of 65% for 24 hours.
  • the low-rate and high-rate peel strengths were measured by a tensile strength tester with 180°angle and peel rates of 0.3m/min (low rate) and 30m/min (high rate).
  • the polarizer having attached thereto the protective film prepared in Examples and Comparative Examples was cut into a size of 25 cm x 22 cm for a sample, which then was kept at a temperature of 23°C and a relative humidity of 50% for 24 hours.
  • the protective film was peeled at a rate of 40m/min from the polarizer, the static voltage generated on the surface of the polarizer was measured by using a static voltage meter STATRION-M2 at 1 cm above the surface of the polarizer.
  • the polarizer having attached thereto the protective film prepared in Examples and Comparative Examples was kept in 50°C oven for 10 days, ans then kept at a temperature of 23°C and a relative humidity of 65% for 24 hours. Then the low-rate/high-rate peel strengths and the peeling electrification voltage were measured again for durability evaluation.
  • Examples 1 5 according to the present invention maintain stable balance of low-rate peel strength and high-rate peel strength and stable peeling electrification voltage before and after durability evaluation without addition of a chelating agent to the metal salt.
  • Comparative Example 1 shows high increase in peeling electrification voltage before and after durability evaluation.
  • Comparative Examples 2 shows a problem that low-rate peel strength and high-rate peel strength remarkably increase after durability evaluation.

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Abstract

The present invention relates to an acrylic pressure-sensitive adhesive composition, and more particularly, to an acrylic pressure-sensitive adhesive composition capable of showing an excellent anti-static performance, and solving a transferring problem of additives and a problem concerning a balance of low-rate and high-rate peel strength, by comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt, and a hydrophobic monomer and b) a metal salt.

Description

PRESSURE-SENSITIVE ADHESIVE COMPOSITION, PROTECTIVE FILM, POLARIZER AND LIQUID CRYSTAL DISPLAY COMPRISING THE SAME
The present invention relates to an acrylic pressure-sensitive adhesive composition, and more particularly, to an acrylic pressure-sensitive adhesive composition capable of showing an excellent anti-static performance, and solving a transferring problem of additives and a problem concerning a balance of low-rate and high-rate peel strength, by comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt, and a hydrophobic monomer and b) a metal salt.
Generally, a protective film is used for protecting the surface of metal products or plastic sheets. As an adhesive for the protective film, an acrylic adhesive has been widely used due to its weather-resistance and transparency. Also as the acrylic adhesive, an adhesive, in which a copolymer comprising an alkyl (meth)acrylate and a crosslinkable monomer is crosslinked with polyisocyanate compound, melamine compound or epoxy compound, has been mainly used.
Concerning adherents of the surface protective film such as polarizers, plastic sheets, electronic appliances, vehicles, and the like, it is very important to protect the adherents from static electricity as well as inflow of foreign material such as dust. Therefore, an anti-static property, together with a adhesive force, is very important in the surface protective film.
In general, static electricity means frictional electrification generated by rubbing two objects or peeling electrification generated by separating two adhered objects. Such static electricity may cause suction of foreign substances such as dust, electrostatic destruction of a device, malfunction of a instrument, fire, and so forth. In particular, the demand of liquid crystal displays (LCDs) has been remarkably increased due to wide spread of computers, expansion of liquid crystal TVs or multi-functional mobile phones, etc. As each assembly device is integrated, and becomes vulnerable to static electricity, it is more important to inhibit generation of static electricity. Also, as the size of the LCDs increases, the size of a polarizer used in manufacturing of the LCD device also increases. Moreover, with the speed-up of processing, static electricity is excessively generated during peeling of a protective film adhered to the polarizer, and then affecting the orientation of liquid crystal in the LCD device and thus causing image detect.
To prevent generation of static electricity, a method of forming an anti-static layer on an outer surface of a polarizer or a protective film substrate layer was proposed, but the effect was not good enough and could not prevent generation of static electricity fundamentally.
Therefore, the anti-static property is needed for the adhesive itself to prevent generation of static electricity. Conventional methods for providing the anti-static property of an adhesive include a method of adding a substance having a conductive component such as a conductive metal powder or a carbon particle to resin and a method of adding a surfactant-type ionic or nonionic substance. However, when the anti-static property is implemented using the additives, a large amount of additives has to be added and thus the additive is migrated to the surface of the pressure-sensitive adhesive, and then degrading a pressure-sensitive adhesive property.
Japanese Patent Laid-Open Publication No. 1993-140519 discloses a method for suppressing static electricity through an addition of ethylene oxide-modified phthalic acid dioctyl plasticizer. However, this method has disadvantages that the plasticizer is migrated to the surface of a polarizer.
Korean Laid-Open Patent Publication No. 2004-30919 discloses a method for suppressing static electricity by adding an organic salt, but this method needs a large amount of expensive organic salt. Korean Laid-Open Patent Publication No. 2006-128659 discloses a method using a chelating agent capable of forming a bond with a metal salt, and alkali metal salt. However, this method is also disadvantageous in that low-rate peel strength is reduced due to a large amount of additives.
To solve the foregoing problems of the prior art, an object of the present invention is to provide a pressure-sensitive adhesive composition capable of maintaining an excellent workability and durability superior anti-static property. Another object of the present invention is to provide a protective film, a polarizer and a liquid crystal display comprising the adhesive composition.
In order to achieve the foregoing objects, the present invention provides an pressure-sensitive adhesive composition comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt and a hydrophobic monomer and b) a metal salt.
The present invention also provides a protective film including a substrate and a pressure-sensitive adhesive layer that is formed on one or both sides of the substrate, and contains the acrylic pressure-sensitive adhesive composition according to the present invention.
The present invention also provides a polarizer comprising a polarizing film or a polarizing device; and a pressure-sensitive adhesive layer that is formed on one or both sides of the film or device, and contains the pressure-sensitive adhesive composition according to the present invention.
The present invention also provides a liquid crystal display comprising a liquid crystal panel in which a polarizer bonded to the protective film according to present invention is attached one or both sides of a liquid crystal cell.
The pressure-sensitive adhesive composition of the present invention is capable of showing an excellent anti-static property, with maintaining a good workability and durability adding a separate chelating agent.
Also, when it is used in a surface protective film for a polarizer, the pressure-sensitive adhesive composition can effectively prevent generation of static electricity after durability evaluation, and exhibits superior balance of low-rate peel strength and high-rate peel strength.
The present invention relates to a pressure-sensitive adhesive composition comprising a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt and a hydrophobic monomer; and b) a metal salt.
Hereinafter, the present invention will be described in detail.
a) Acrylic copolymer
An acrylic copolymer used in the present invention is not specially limited, as long as it can be used as an adhesive in the art. For instance, the acrylic copolymer may comprise i) 0.8-5 parts by weight of a (meth)acrylic acid ester monomer having an alkylene oxide group; and
ii) 3-18 parts by weight of a hydrophobic monomer.
The (meth)acrylic acid ester monomer having an alkylene oxide group is capable of chelating with a metal salt. In the present invention, the specific kinds of the (meth)acrylic acid ester monomer is not specially limited. For example, the (meth)acrylic acid ester monomer may be a compound represented by the following formula 1:
[formula 1]
Figure PCTKR2009000178-appb-I000001
,
wherein R1 represent a hydrogen or an alkyl group having 1 to 4 carbon atom(s), m is an integer of 1 to 4, n is an integer of 1 to 10, and R2 represents an alkyl group having 1 to 6 carbon atom(s) or an aryl group having 5 to 12 carbon atoms.
As the compound represented by the above Formular 1, it is preferable to use one or more selected from the group consisting of alkoxy dialkyleneglycol (meth)acrylic acid ester, alkoxy trialkyleneglycol (meth)acrylic acid ester, alkoxy polyalkyleneglycol (meth)acrylic acid ester, phenoxy dialkyleneglycol (meth)acrylic acid ester, phenoxy trialkyleneglycol (meth)acrylic acid ester and phenoxy polyalkyleneglycol (meth)acrylic acid ester. In the above, the alkoxy may be an alkoxy having 1 to 6 carbon atom(s), and more concretely, it may be methoxy, ethoxy or butoxy. Also, the alkyleneglycol may be an alkyleneglycol having 1 to 4 carbon atom(s), and more concretely, it may be ethylene glycol or propylene glycol.
The acrylic copolymer may comprise the monomer having a functional group capable of chelating with a metal salt in an amount of 0.8 to 5 parts by weight, and preferably 1 to 5 parts by weight, and more preferably 2 to 4 parts by weight, based on 100 parts by weight of the copolymer. When the content of the monomer is less than 0.8 parts by weight, it is apprehended that a stable anti-static property is difficult to be realized, whereas when the content is more than 5 parts by weight, it is apprehended that the peel strength after durability evaluation significantly increases with time.
The hydrophobic monomer of the above ii) is not specially limited. For instance, a (meth)acrylic acid ester monomer having an alkyl group of at least 10 carbon atoms, and more preferably a (meth)acrylic acid ester monomer having alkyl group of 10 to 15 carbon atoms can be used. As the hydrophobic monomer, it is preferable to use one selected from or a mixture of two or more selected from the group consisting of isobonyl (meth)acrylate, lauryl (meth)acrylate, tridecyl (meth)acrylate, (meth)acryl acid, and the like.
The acrylic copolymer may comprise the hydrophobic monomer in an amount of 1 to 18 parts by weight, and preferably 2 to 10 parts by weight, and more preferably 3 to 8 parts by weight, relative to 100 parts by weight of the copolymer. When the content of the monomer is less than 1 parts by weight, it is apprehended that a durability of the adhesive is deteriorated, whereas when the content is more than 18 parts by weight, it is apprehended that the low-rate peel strength and/or high-rate peel strength is deteriorated, or wettability is decreased.
In one embodiment of the present invention, the acrylic copolymer may further comprises:
iii) 80 to 95 parts by weight of alkyl (meth)acrylate having an alkyl group of 1 to 9 carbon atom(s); and iv) 0.1 to 10 parts by weight of a monomer containing a crosslinkable functional group.
An examples of iii) the alkyl (meth)acrylate having an alkyl group of 1 to 9 carbon atom(s), it is preferable to use one selected from or a mixture of two or more selected from a group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, n-octyl (meth)acrylate, n-octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and the like. Preferably, 2-ethylhexyl (meth)acrylate may be used as the alkyl (meth)acrylate, but it is not limited thereto.
The acrylic copolymer may comprise the alkyl (meth)acrylate monomer in an amount of 80 to 95 parts by weight, based on 100 parts by weight of the copolymer. When the content of the monomer is less than 80 parts by weight, it is apprehended that an adhesive property in early stage is decreased, whereas when the content is more than 95 parts by weight, it is apprehended that a durability is decreased.
In the above, the monomer containing a crosslinkable functional group may function as imparting cohesive strength and adhesive strength by reacting with a crosslinking agent.
An example of the monomer containing a crosslinkable functional group comprises a monomer containing hydroxyl group, a monomer containing a carboxy group and/or a monomer containing nitrogen. In the present invention, one or two or more of the foregoing monomers may be used. An example of usable monomers containing a hydroxyl group herein may include, but is not limited to, one or two or more species of 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethyleneglycol (meth)acrylate or 2-hydroxypropyleneglycol (meth)acrylate. An example of usable monomers containing a carboxyl group herein may include, but is not limited to, one or two or more species of (meth)acrylic acid, 2-(meth)acryloyloxy acetic acid, 3-(meth)acryloyloxy propylic acid, 4-(meth)acryloyloxy butylic acid, acrylic acid dimer, itaconic acid, maleic acid and maleic anhydride. An example of usable monomers containing nitrogen herein may include, but is not limited to, one or two or more species of (meth)acrylamide, N-vinyl pyrolidone and N-vinyl caprolactam.
The acrylic copolymer may comprise the monomer containing a crosslinkable functional group in an amount of 0.1 to 10 parts by weight, and preferably 0.5 to 10 parts by weight, relative to 100 parts by weight of the copolymer. When the content of the monomer is less than 0.1 parts by weight, it is apprehended that the cohesive destruction easily occurs under a high temperature and/or high humidity condition, whereas when the content is more than 10 parts by weight, it is apprehended that flowability is decreased.
According to the present invention, in order to control the glass transition temperature of the pressure-sensitive adhesive or impart various functions, a co-monomer having high glass transition temperature may be comprised in the acrylic copolymer as an arbitrary component.
An example of usable co-monomer may include, but it is not limited to, a compound represented by the following Formular 2:
[Formular 2]
Figure PCTKR2009000178-appb-I000002
,
wherein, R3, R4 and R5 represents independently hydrogen or alkyl, R6 represents cyano; phenyl unsubstituted or substituted with alkyl; acetyloxy; or COR7, where R7 represents amino unsubstituted or substituted with alkyl or alkoxyalkyl; or glycidyloxy.　
In the definitions of R3 to R7 of the above formula 2, alkyl or alkoxy means alkyl or alkoxy having 1 to 8 carbon atoms, and is, preferably, methyl, ethyl, methoxy, ethoxy, propoxy or butoxy.
The specific kind of monomer represented by the above Formula 1 may include, but is not limited to, one or two or more of nitrogen-containing monomers such as (meth)acrylonitrile, (meth)acrylamide, N-methyl (meth)acrylamide or N-butoxy methyl (meth)acrylamide; styrene monomer such as styrene or methyl styrene; glycidyl (meth)acrylate; or carbonic acid vinyl ester such as vinyl acetate, and the like. When the co-monomer as above is contained in the present acrylic copolymer, the content is, preferably, 20 parts by weight or less, based on 100 parts by weight of the acrylic copolymer.　 If said content is in excess of 20 parts by weight, it is apprehended that flexibility and/or peel force of the pressure-sensitive adhesive is lowered.
The method for preparing the acrylic copolymer is not particularly restricted.　 For example, it can be prepared through general methods such as solution polymerization, photo-polymerization, bulk polymerization, suspension polymerization, or emulsion polymerization.　 Especially, it is preferred to use solution polymerization.　 Preferably, such solution polymerization is carried out at a polymerization temperature of 50 to 140℃ by mixing an initiator in a state that each monomer is homogeneously mixed.　 At this time, as a usable initiator, a usual initiator, for example, an azo-based polymerization initiator such as azo-bisisobutyronitrile or azobiscyclohexanecarbonitrile; and/or a peroxide such as benzoyl peroxide or acetyl peroxide may be included.
In the present invention, the weight-average molecular weight of the acrylic copolymer may be controlled considering the heat-resistance, peel strength and/or coating efficiency and it is not specially limited. For example, the weigh-average molecular weight of the copolymer may be 200,000 to 1,000,000, and preferably is 300,000 to 8,500,000.
b) Metal Salt
In the present invention, the metal salt may comprise a metal cation and/or anion that can be chelated with the monomer having a functional group capable of chelating. The metal salt is preferably a compound in which a metal ion can be easily dissociated from the salt when the compound is mixed with a solvent or the copolymer having a functional group capable of chelating. Also, it is preferable that the metal ion has small ionic radius and low dissociation energy.
The metal salt can be comprised in an amount of 0.001 to 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer. When the content of metal salt is less than 0.001 parts by weight, it is apprehended that the anti-static performance is degraded, whereas when the content is more than 10 parts by weight, it is apprehended that the endurance reliability may decrease due to low cohesive strength.
The usable metal salt herein may comprises, but is not limited to, one or more metal cation selected from the group consisting of lithium, sodium, potassium, magnesium, calcium, barium and cesium; and one or more anion selected from the group consisting of Cl-, Br-, I-, BF4 -, PF6 -, AsF-, ClO4 -, NO2 -, CO3 -, N(CF3SO2)2 -, N(CF3CO)2 -, N(C2F5SO2)2 -, N(C2F5CO)2 -, N(C4F9SO2)2 -, C(CF3SO2)3 - and CF3SO3 -.
c) Crosslinking Agent
The acrylic pressure-sensitive adhesive composition according to the present invention, if necessary, may additionally comprise a multi-functional crosslinking agent. The multi-functional crosslinking agent has a function of increasing cohesion of the adhesive by reacting with the crosslinkable functional group contained in the acrylic copolymer.
Specific kind of the cross-linking agent which may be used herein is not particularly restriced, and may include conventional ones such as an isocyanate compound, an epoxy compound, an aziridine compound and a metal chelate compound.
An example of the isocyanate compound includes tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethylxylene diisocyanate, naphthalene diisocyanate and a reaction product of any one of the foregoing with polyol (ex. trimethylol propane); an example of the epoxy compound includes ethyleneglycol diglycidylether, triglycidylether, trimethylolpropane triglycidylether, N,N,N'N'-tetraglycidyl ethylenediamine and glycerin diglycidylether; an example of the aziridine compound include N,N'-toluene-2,4-bis(1-aziridinecarboxamide), N,N'-diphenylmethane-4,4'-bis(1-aziridinecarboxamide), triethylene melamine, bisisophthaloyl-1-(2-methylaziridine) and tri-1-aziridinylphosphine oxide.　 Also, an example of the metal chelate compound includes compound in which multivalent metal such as aluminum, iron, zinc, tin, titan, antimony, magnesium and/or vanadium is being chelated to acetyl acetone or ethyl acetoacetate. In the present invention, one or two or more of the forgoing may be used alone or in a mixture thereof.
The content of multi-functional crosslinking agent is preferably 0.1 - 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer. When the content is controlled in the above range, the cohesive strength of the pressure-sensitive adhesive is superior, a problem in pressure-sensitive adhesion durability such as bubbles or exfoliation does not occur, and lifting does not occur, thereby providing superior endurance reliability.
d) Additive
The acrylic pressure-sensitive adhesive composition according to the present invention, if necessary, may additionally comprise a silane coupling agent and/or tackifier.
The silane coupling agent has a function of improving adhesion stability and thus improving heat resistance/moisture resistance when the acrylic pressure-sensitive adhesive is adhered to a glass substrate. In particular, the silane coupling agent serves to be of help to enhances adhesion reliability when it is left for a long time under high temperature and high humidity.
The silane coupling agent may use one selected from or a mixture of at least two selected from a group consisting of γ-glycydoxypropyl trimethoxysilane, γ-glycydoxypropyl methyldiethoxysilane, γ-glycydoxypropyl triethoxysilane, 3-mercaptopropyl trimethoxysilane, vinyl trimethoxysilane, vinyl triethoxysilane, γ-methacryloxypropyl trimethoxysilane, γ-methacryloxypropyl triethoxysilane, γ-aminopropyl trimethoxysilane, γ-aminopropyl triethoxysilane, 3-isocyanatepropyl triethoxysilane, γ-acetoacetatepropyl trimethoxysilane, and the like.
The content of silane coupling agent is preferably 0.005 5 parts by weight, relative to 100 parts by weight of the acrylic copolymer. When the content is controlled in the above range, adhesion stability and adhesion reliability are enhanced under high temperature and high humidity.
The tackifier resin has a function of controlling the adhesive performance of the acrylic pressure-sensitive adhesive.
The tackifier resin may use one selected from or a mixture of at least two selected from a group consisting of (hydrogenated) hydrocarbon resin, (hydrogenated) rosin resin, (hydrogenated) rosin ester resin, (hydrogenated) terpene resin, (hydrogenated) terpene penol resin, polymerized rosin resin, polymerized rosin ester resin, and the like.
The content of tackifier resin is preferably 1 to 100 parts by weight, relative to 100 parts by weight of the acrylic copolymer. When the content is in that range, the compatibility and cohesive strength of the pressure-sensitive adhesive can be enhanced.
The acrylic pressure-sensitive adhesive composition according to the present invention, if necessary, may additionally comprise an additive such as acrylic low-molecular-weight substances, epoxy resin, curing agents, UV stabilizers, antioxidants, coloring agents, reinforcing agents, fillers, antifoaming agents, surfactants, plasticizer, or organic salts.
The acrylic pressure-sensitive adhesive composition according to the present invention can be widely used without limitation, such as for industrial sheets, particularly protective films, reflective sheets, structural pressure-sensitive adhesive sheets, photographic pressure-sensitive adhesive sheets, lane marking pressure-sensitive adhesive sheets, optical pressure-sensitive adhesive products, or pressure-sensitive adhesives for electronic components. The pressure-sensitive adhesive composition can also be applied to equivalent fields using same principles such as multi-layer laminate products, i.e., general industrial pressure-sensitive adhesive sheet products, medical patches, heat activated pressure sensitive adhesives, or the like.
The present invention also provides a protective film including:
a substrate; and
a pressure-sensitive adhesive layer that is formed on one or both sides of the substrate, and contains the pressure-sensitive adhesive composition according to the present invention.
The protective film can be effectively used for protecting an optical film, preferably the surface of a polarizer.
The substrate film, which is not particularly limited, may be a cellulose film, polyester film such as polycarbonate, or polyethylene terephthalate; a poly ether film such as polyether sulphone; or a polyolefine film such as polyethylene film, polypropylene film, polyolefin film having cyclo or norbornene structure, or ethylene-propylene copolymer.
The substrate may have a single layer or two or more laminated layers, and its thickness may be properly selected depending on its application, but is preferably 5 ㎛ to 500 ㎛, and more preferably 15 ㎛ to 100 ㎛.
Also, the substrate film may be treated with surface-treatment or primer-treatment on one side or both sides to enhance the adherent property between the substrate and the pressure-sensitive adhesive, and may further include an anti-static layer or an anti-fouling layer.
A method of forming the pressure-sensitive adhesive layer on the substrate as above is not particularly restricted, and, for example a method in whiche the composition or coating liquid is coated and hardened on said substrate with Bar Coater and the like, or a method in which the composition or coating liquid is coated and dryed on the surface of releasable substrate and then, the prepared adhesive layer is transferred to the surface of the substrate.
At this time, the thickness of the adhesive layer may be 2 ㎛ to 100 ㎛, and preferably 5 ㎛ to 50 ㎛.
In the protective film of the present invention, the gel content (crosslinking density) as represented in General Formula 1 below is preferably 50% to 95%.
[General Formula 1]
Gel Content (%) = B/A ｘ 100
wherein, A represents weight of a pressure-sensitive adhesive composition, and B represents dry weight of insoluble content after depositing the pressure-sensitive adhesive composition in ethyl acetate at ambient temperature for 48 hours.
If said gel content is less than 50%, or in excess of 95%, it is apprehended that the endurance reliability under high temperature and/or high humidity conditions is lowered.
The present invention also provides a polarizer including:
a polarizing film or a polarizing device; and
a pressure-sensitive adhesive layer that is formed on one or both side of the polarizing film or polarizing device, and contains the acrylic pressure-sensitive adhesive composition according to the present invention.
Specific kind of a polarizing film or polarizing device constituting said polarizer of the present invention is not particularly restricted.　　 For example, a film obtained by containing a polarizing component such as iodine or dichroic dye into polyvinyl alcohol resin film, and elongating the resulting product may be used as said polarizing film.　 Said polyvinyl alcohol resin may comprise polyvinyl alcohol, polyvinyl formal, polyvinyl acetal and hydrolysate of ethylene-vinyl acetate copolymer, and the like.　 The thickness of said polarizing film is also not particularly restricted.　 It may be formed in a usual thickness.
The polarizer may be formed as a multilayer film, wherein protective films, such as a cellulose film, for example, triacetyl cellulose; a polyester film, for example a polycarbonate film or a polyethylene terephthalate; a polyether sulphone film; and/or a polyolefin film, for example, polyethylene film, polypropylene film, polyolefin film having cyclo or norbornene structure, or ethylene-propylene copolymer, are laminated on one or both sides of the polarizing film or device.　 At this time, the thickness of these protective films is also not particularly restricted.　 It may be formed in a usual thickness.
In addition, the present polarizer may further comprise one or more functional layers selected from the group consisting of protective layer, reflecting layer, anti-glare layer, phase difference plate, compensation film for wide view angle, and brightness enhancing film.
The method of forming the pressure-sensitive adhesive layer on the polarizing film or device as above, a thickness and crosslinking density are not particularly restricted. For example, the same method, thickness or crosslinking density as described in the protective film can be applied.
The present invention further provides a liquid crystal display comprising a liquid crystal panel in which a polarizer bonded to the protective film of the present invention is attached one or both sides of a liquid crystal cell.
Specific kind of liquid crystal cell, constituting the liquid crystal display of the present invention as above, is not particularly restricted, and includes all general liquid crystal cells such as TN (Twisted Neumatic), STN (Super Twisted Neumatic), IPS (In Plane Switching) or VA (Vertical Alignment).　 Specific kind of other construction included in the liquid crystal display of the present invention and process for preparing the same is not particularly restricted, and general constructions in this field may be selected and used without limitation.
[EXAMPLE]
While examples of the present invention have been described in detail, it is apparent to those of ordinary skill in the art that various changes and modifications can be made within the technical idea of the present invention and those changes and modifications are included in the appended claims.
Preferred embodiments of the present invention will be provided in the following examples to help understanding of the present invention, but those embodiments are used only for the purpose of illustration, without limiting the scope of the present invention.
<Preparation Example 1>
To 1 L reactor equipped with a cooling system was added a mixture of monomers consisting of 90 parts by weight of 2-ethylhexyl acrylate (EHA), 5 parts by weight of lauryl acrylate, 2 parts by weight of methoxy triethylene glycol acrylate and 3 parts by weight of 2-hydroxyethylacrylate (HEA).　 Then, 100 parts by weight of ethyl acetate (EAc) was added thereto as a solvent. To remove oxygen, nitrogen gas was purged for 60 minutes.　 Then, the temperature was kept at 70℃, and 0.1 parts by weight of azobis(2-methylbutyronitrile)(Wako, V-59) as a initiator was added thereto and reacted for 6 hours.　 After the reaction, the resulting product was diluted with ethyl acetate (EAc) to prepare an acrylic copolymer having a solid content of 44 % by weight, a weight average molecular weight of 580,000, and a molecular weight distribution of 7.0.
<Preparation Examples 2 to 7>
Except that components and compositions as shown in Table 1 were used, an acrylic copolymer was prepared by the same method as described in Preparation Example 1.
Table 1
Figure PCTKR2009000178-appb-T000001
<Example 1>
The 100 parts by weight of the acrylic copolymer prepared in Preparation Example 1, 5.0 parts by weight of a prepolymer of hexamethylenediisocyanate as a crosslinking agent, and 0.1 parts by weight of lithiumtrifluoromethanesulfoneimid (LiN(CF3SO2)2) as a metal salt were added. This mixture was diluted in a proper concentration, homogeneously mixed, coated on one side of a 2-axis polyethyleneterephthalate film having a thickness of 38 ㎛ and dried, thereby preparing a 20 ㎛ homogeneous pressure-sensitive adhesive layer.
Then, a releasing film was laminated on the pressure-sensitive adhesive layer coated on the one side of the polyethyleneterephthalate film and the product was kept for 4 days at a temperature of 23℃ and a humidity of 55% for sufficient aging. The thus prepared protective film was cut into proper sizes, and adhered onto a treacetyl cellulose surface (TAC film, Fusi Film Co. of Japan) and an anti-glare film (AG TAC, DNP Co. of Japan) of the polarizer for evaluation.
<Examples 2-5 and Comparative Examples 1 and 2>
Except that the acrylic copolymer was mixed using components and compositions as shown in Table 2, the samples was prepared by the same method as described in Example 1.
Table 2
Figure PCTKR2009000178-appb-T000002
By using the protective film prepared in Examples 1 to 5, and Comparative Examples 1 and 2, low-rate peel strength, high-rate peel strength, and peeling electrification voltage were measured and the results are illustrated in Table 3. Also, low-rate peel strength, high-rate peel strength, and peeling electrification voltage after after heat resistance evaluation were also measured and the results are illustrated in Table 4.
1. Low-rate and High-rate Peel Strengths
The adhesive layer prepared in Examples and Comparative Examples was attached onto a treacetyl cellulose surface (TAC film, Fusi Film Co. of Japan) and an anti-glare film (AG TAC, DNP Co. of Japan) by using a roller of 2kg on the basis of JIS Z 0.27, and was kept at a temperature of 23 C and a relative humidity of 65% for 24 hours. The low-rate and high-rate peel strengths were measured by a tensile strength tester with 180°angle and peel rates of 0.3m/min (low rate) and 30m/min (high rate).
2. Peeling electrification voltage
The polarizer having attached thereto the protective film prepared in Examples and Comparative Examples was cut into a size of 25 cm x 22 cm for a sample, which then was kept at a temperature of 23℃ and a relative humidity of 50% for 24 hours. When the protective film was peeled at a rate of 40m/min from the polarizer, the static voltage generated on the surface of the polarizer was measured by using a static voltage meter STATRION-M2 at 1 cm above the surface of the polarizer.
3. Durability
The polarizer having attached thereto the protective film prepared in Examples and Comparative Examples was kept in 50℃ oven for 10 days, ans then kept at a temperature of 23℃ and a relative humidity of 65% for 24 hours. Then the low-rate/high-rate peel strengths and the peeling electrification voltage were measured again for durability evaluation.
Table 3
Figure PCTKR2009000178-appb-T000003
Table 4
Figure PCTKR2009000178-appb-T000004
As shown in Table 3 and Table 4, Examples 1 5 according to the present invention maintain stable balance of low-rate peel strength and high-rate peel strength and stable peeling electrification voltage before and after durability evaluation without addition of a chelating agent to the metal salt.
On the contrary, Comparative Example 1 shows high increase in peeling electrification voltage before and after durability evaluation. Comparative Examples 2 shows a problem that low-rate peel strength and high-rate peel strength remarkably increase after durability evaluation.

Claims (18)

  1. A pressure-sensitive adhesive composition comprising:
    a) an acrylic copolymer including a monomer having a functional group capable of chelating with a metal salt, and a hydrophobic monomer; and
    b) a metal salt.
  2. The pressure-sensitive adhesive composition of claim 1, wherein the monomer having a functional group capable of chelating with a metal salt is an acrylic monomer having an alkylene oxide group.
  3. The pressure-sensitive adhesive composition of claim 1, wherein the monomer having a functional group capable of chelating with a metal salt is a compound represented by the following Formula 1:
    [Formula 1]
    ,
    wherein R1 represents a hydrogen or an alkyl group having 1 to 4 carbon atom(s), m is an integer of 1 to 4, n is an integer of 1 to 10, and R2 represents an alkyl group having 1 to 6 carbon atom(s) or an aryl group having 5 to 12 carbon atoms.
  4. The pressure-sensitive adhesive composition of claim 1, wherein the monomer having a functional group capable of chelating with a metal salt is one or more selected from the group consisting of alkoxy dialkyleneglycol (meth)acrylic acid ester, alkoxy trialkyleneglycol (meth)acrylic acid ester, alkoxy polyalkyleneglycol (meth)acrylic acid ester, phenoxy dialkyleneglycol (meth)acrylic acid ester, phenoxy trialkyleneglycol (meth)acrylic acid ester and phenoxy polyalkyleneglycol (meth)acrylic acid ester.
  5. The pressure-sensitive adhesive composition of claim 1, wherein the acrylic copolymer comprises the monomer having a functional group capable of chelating with a metal salt in an amount of 0.8 to 5 parts by weight, based on 100 parts by weight of the copolymer.
  6. The pressure-sensitive adhesive composition of claim 1, wherein the hydrophobic monomer is a (meth)acrylic acid ester having 10 or more carbon atoms.
  7. The pressure-sensitive adhesive composition of claim 1, wherein the hydrophobic monomer is one or more selected from the group consisting of isobonyl (meth)acrylate, lauryl (meth)acrylate and tridecyl (meth)acrylate.
  8. The pressure-sensitive adhesive composition of claim 1, wherein the acrylic copolymer comprises the hydrophobic monomer in an amount of 1 to 18 parts by weight, based on 100 parts by weight of the copolymer..
  9. The pressure-sensitive adhesive composition of claim 1, wherein the acrylic copolymer further comprises 80 to 95 parts by weight of an alkyl (meth)acrylate having 1 to 9 carbon atom(s); and 0.1 to 10 parts by weight of a monomer having a crosslinkable functional group, based on 100 parts by weight of the copolymer.
  10. The pressure-sensitive adhesive composition of claim 9, wherein the alkyl (meth)acrylate having 1 to 9 carbon atom(s) is one or more selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, n-octyl (meth)acrylate and 2-ethylhexyl (meth)acrylate.
  11. The pressure-sensitive adhesive composition of claim 9, wherein the monomer having a crosslinkable functional group is a monomer containing hydroxyl group, a monomer containing carboxy group or a monomer containing nitrogen.
  12. The pressure-sensitive adhesive composition of claim 1, wherein the metal salt comprises one or more metal cation selected from the group consisting of lithium, sodium, potassium, magnesium, calcium, barium and cesium; and one or more anion selected from the group consisting of Cl-, Br-, I-, BF4 -, PF6 -, AsF-, ClO4 -, NO2 -, CO3 -, N(CF3SO2)2 -, N(CF3CO)2 -, N(C2F5SO2)2 -, N(C2F5CO)2 -, N(C4F9SO2)2 -, C(CF3SO2)3 - and CF3SO3 -.
  13. The pressure-sensitive adhesive composition of claim 1, wherein the metal salt is comprised in an amount of 0.001 to 10 parts by weight, relative to 100 parts by weight of the acrylic copolymer.
  14. The pressure-sensitive adhesive composition of claim 1, further comprising 0.1 to 10 parts by weight of a multi-functional crosslinking agent, relative to 100 parts by weight of the acrylic copolymer.
  15. The pressure-sensitive adhesive composition of claim 14, wherein the multi-functional crosslinking agent is one or more selected from the group consisting of isocyanate compound, epoxy compound, aziridine compound and metal chelate compound.
  16. A protective film comprising:
    a substrate; and
    a pressure-sensitive adhesive layer that is formed on one or both sides of the substrate, and contains the pressure-sensitive adhesive composition according to any one of claims 1 to 15.
  17. A polarizer comprising:
    a polarizing film or a polarizing device; and
    a pressure-sensitive adhesive layer that is formed on one or both sides of the film or device, and contains the pressure-sensitive adhesive composition according to any one of claims 1 to 15.
  18. A liquid crystal display comprising a liquid crystal panel in which a polarizer bonded to the protective film according to claim 16 is attached one or both sides of a liquid crystal cell.
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EP2231807A2 (en) 2010-09-29
US10100234B2 (en) 2018-10-16
EP2231807B1 (en) 2015-02-18
WO2009091171A3 (en) 2009-10-01
TWI379875B (en) 2012-12-21
EP2231807A4 (en) 2011-12-14
KR20090078204A (en) 2009-07-17
CN101910346A (en) 2010-12-08
TW200948917A (en) 2009-12-01
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US20110187970A1 (en) 2011-08-04
JP2011511853A (en) 2011-04-14

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