WO2015046844A1 - Film optique acrylique et plaque polarisante le comprenant - Google Patents

Film optique acrylique et plaque polarisante le comprenant Download PDF

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Publication number
WO2015046844A1
WO2015046844A1 PCT/KR2014/008799 KR2014008799W WO2015046844A1 WO 2015046844 A1 WO2015046844 A1 WO 2015046844A1 KR 2014008799 W KR2014008799 W KR 2014008799W WO 2015046844 A1 WO2015046844 A1 WO 2015046844A1
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Prior art keywords
water
resin
acrylic
substituted
unsubstituted
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PCT/KR2014/008799
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English (en)
Korean (ko)
Inventor
임이랑
심화섭
김경원
전성현
박준욱
Original Assignee
주식회사 엘지화학
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Publication date
Priority claimed from KR1020140124602A external-priority patent/KR101549791B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to US15/024,731 priority Critical patent/US9945986B2/en
Priority to EP14848040.3A priority patent/EP3053946B1/fr
Priority to CN201480054154.7A priority patent/CN105658708B/zh
Priority to JP2016545682A priority patent/JP6415576B2/ja
Publication of WO2015046844A1 publication Critical patent/WO2015046844A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
    • C08G18/6225—Polymers of esters of acrylic or methacrylic acid
    • C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/44—Polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2333/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2475/04—Polyurethanes

Definitions

  • the present invention relates to an acrylic optical film and a polarizing plate and a display device including the same, and more particularly, a urethane-based primer layer is formed on one surface, a non-urethane-based primer layer is formed on the other surface, the adhesive force with the adhesive and the surface coating layer
  • the present invention relates to an acrylic optical film excellent in antiblocking property and slip property, and a polarizing plate and a display device including the same.
  • the polarizing plate has been commonly used as a structure in which a protective film is laminated using one or both surfaces of a polarizer made of polyvinyl alcohol (hereinafter referred to as 'PVA')-based resin dyed with dichroic dye or iodine.
  • a polarizer made of polyvinyl alcohol (hereinafter referred to as 'PVA')-based resin dyed with dichroic dye or iodine a triacetyl cellulose (TAC) film has been mainly used as a polarizer protective film, but such a TAC film has a problem in that it is easily deformed in a high temperature and high humidity environment. Accordingly, recently, protective films of various materials that can replace TAC films have been developed.
  • polyethylene terephthalate (PET), cycloolefin polymer (COP, cycloolefin polymer), and acrylic films may be used alone. Or a mixed use has been proposed. Among them, the acrylic film has an advantage of excellent optical properties and durability, and inexpensive, attracting particular attention.
  • PET polyethylene terephthalate
  • COP cycloolefin polymer
  • acrylic films may be used alone. Or a mixed use has been proposed. Among them, the acrylic film has an advantage of excellent optical properties and durability, and inexpensive, attracting particular attention.
  • acrylic films have a higher surface friction than other films, resulting in poor adhesion with the adhesive layer, poor slipability during winding, and poor workability, and blocking phenomenon in which the film and the film surface stick to each other after winding. There is this.
  • a method of filling a small amount of rubber particles or inorganic particles during the acrylic film formation has been proposed, but in the case of the acrylic film manufactured by the above method, the haze increases and the transparency of the film decreases. Problems such as a decrease in the stretchability of the film occurred, which was not suitable as an optical film.
  • one surface of the polarizer protective film may include various functional coating layers such as an antireflection layer and a hard coating layer on the opposite side of the surface to which the polarizer is attached for the purpose of antireflection, durability improvement, scratch prevention, and visibility improvement.
  • the functional coating layers are generally formed by applying a coating composition including a base resin, a solvent, an additive, and the like on a protective film and then curing the coating composition.
  • a coating composition including a base resin, a solvent, an additive, and the like
  • poor solvent resistance may cause problems such as poor coating of the functional coating layer or melting of the film surface when the functional coating layer is formed.
  • a method of performing surface treatment such as plasma treatment, corona treatment, or forming a primer layer on the surface of the protective film has been proposed.
  • the adhesion between the film and the functional coating layer could not be sufficiently secured.
  • a urethane-based primer which has been conventionally proposed as a primer layer for a protective film
  • the adhesive strength is reduced due to moisture infiltration, or a coating composition including an organic solvent on the primer layer.
  • the present invention is to solve the above problems, the urethane-based primer layer is formed on one side, the non-urethane-based primer layer is formed on the opposite side, excellent adhesion to the adhesive layer and the surface coating layer, anti blocking property, slip An acrylic optical film having excellent properties and a polarizing plate and a display device including the same are provided.
  • the first primer layer comprising a water-dispersible polyurethane resin is formed on one side, the water-dispersible polyester resin, water-dispersible acrylic resin and water-dispersible polyester acrylic resin on the opposite side
  • an acrylic film on which a second primer layer containing at least one or more kinds is formed.
  • At least one of the first primer layer and the second primer layer may include water dispersible fine particles, and the content of the water dispersible fine particles may be about 0 parts by weight to about 10 parts by weight based on the total content of the first primer composition. And it may be about 0 to 20 parts by weight based on the total amount of the second primer composition.
  • the water-dispersible polyurethane resin is preferably a carbonate-based polyurethane or ester-based polyurethane.
  • the water-dispersible polyester-based resin preferably includes a repeating unit represented by the following [Formula 1].
  • R 1 and R 2 are each independently hydrogen, substituted or unsubstituted C 1 ⁇ 20 alkyl, substituted or unsubstituted C 6 ⁇ 20 aryl group, or a substituted or unsubstituted C 5 ⁇ 20 cycloalkyl,
  • R 3 and R 4 are each independently hydrogen, substituted or unsubstituted C 1 ⁇ 20 alkyl, substituted or unsubstituted C 6 ⁇ 20 aryl group, a substituted or unsubstituted C 5 ⁇ 20 cycloalkyl, carboxy group, hydroxy group or sulfonic acid Base, and at least one of R 3 and R 4 is a carboxyl group, hydroxy group or sulfonate group.
  • the water-dispersible acrylic resin includes a repeating unit represented by the following [Formula 3].
  • R 5 is Hydrogen or substituted or unsubstituted C 1-20 alkyl, preferably hydrogen or methyl,
  • R 6 is hydrogen, substituted or unsubstituted C 1-20 alkyl, epoxy group or hydroxy group.
  • the water-dispersible polyester acrylic resin may be a polyester acrylic resin containing both the ester-based repeating unit represented by the above [Formula 1] and the acrylic repeating unit represented by the [Formula 3].
  • the polyester acrylic resin is preferably prepared by reacting the polyester glycol and the acrylic monomer in a weight ratio of 1: 9 to 9: 1.
  • the acrylic film of the present invention may further include a functional coating layer on the second primer layer.
  • a polarizer According to another embodiment of the present invention, a polarizer; An acrylic film of the present invention disposed on at least one surface of the polarizer; And an adhesive layer interposed between the polarizer and the acrylic film, wherein a first primer layer of the acrylic film is disposed on the adhesive layer side.
  • the acrylic film of the present invention is a polyester or acrylic resin having a first primer layer including a polyurethane resin having excellent adhesion to the adhesive layer on one surface, high solvent resistance on the other surface, and excellent adhesion to the composition for forming a functional coating layer.
  • the second primer layer is formed, and the adhesion to the adhesive layer and the functional coating layer is very excellent.
  • the acrylic film of the present invention is excellent in anti-blocking properties and slip properties due to the low surface frictional force of the film surface due to the presence of a primer layer, and thus excellent in workability without blocking during and after winding.
  • the inventors of the present invention have been researched to develop an acrylic film having excellent adhesion to the adhesive layer and the surface coating layer, and excellent in anti-blocking property and slip property, and thus, forming a urethane-based primer layer on one surface of the acrylic film,
  • the present invention was completed by finding that the above object can be achieved by forming a urethane-based primer layer.
  • a first primer layer containing a water dispersible polyurethane resin is formed on one surface thereof, and a water dispersible polyester resin, a water dispersible acrylic resin, and a water dispersible polyester acrylic resin are formed on the other surface.
  • a second primer layer containing at least one of the above is formed.
  • the first primer layer is to improve the adhesion between the adhesive layer and the acrylic film, and is formed by the first primer composition containing a polyurethane resin.
  • the first primer composition may include a polyurethane resin and water, and may further include water-dispersible fine particles as necessary.
  • the first primer composition of the present invention based on the total content of the first primer composition, 1 part by weight to 30 parts by weight of polyurethane resin, 0 parts by weight to 10 parts by weight of water-dispersible fine particles and the remainder of water It may be preferably, but may include 1 part by weight to 30 parts by weight of polyurethane resin, 0.1 parts by weight to 5 parts by weight of water-dispersible fine particles and the balance of water, but is not limited thereto.
  • the 'residue' means the remaining content except the content of the solid content of the total content of the entire primer composition.
  • the polyurethane resin refers to a resin containing a urethane repeating unit formed by the reaction of isocyanate and polyol in the main chain, wherein the isocyanate can be used without limitation compounds having two or more NCO groups, the polyol As the furnace, compounds including two or more hydroxyl groups, for example, polyester-based polyols, polycarbonate-based polyols, polyether polyols and the like can be used without limitation.
  • the isocyanate component for example, toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate (NDI), tolidine diisocyanate (TODI), hexamethylene diisocyanate (HMDI), isopron diisocyanate (IPDI), p-phenylene diisocyanate, transcyclohexane, 1,4-diisocyanate and xylene diisocyanate (XDI) alone Or two or more types can be used in combination.
  • TDI toluene diisocyanate
  • MDI 4,4-diphenylmethane diisocyanate
  • NDI 1,5-naphthalene diisocyanate
  • TODI tolidine diisocyanate
  • HMDI hexamethylene diisocyanate
  • IPDI isopron diisocyanate
  • the polyester-based polyol can be obtained by reacting a polybasic acid component and a polyol component, wherein, as the polybasic acid component, for example, ortho-phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid Aromatic dicarboxylic acids such as 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, biphenyldicarboxylic acid and tetrahydrophthalic acid; Aliphatic dicarboxylic acids such as oxalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, linoleic acid, maleic acid, fumaric acid, mesaconic acid and itaconic acid; Alicyclic dicarboxylic acids such as hexahydrophthalic acid, tetrahydro
  • the polycarbonate-based polyol can be obtained by reacting a compound having a carbonate group and a polyol component, wherein.
  • the compound having the carbonate group may be, for example, diphenyl carbonate, dialkyl carbonate, alkylene carbonate, or the like.
  • the said polyether polyol can be obtained by ring-opening-polymerizing alkylene oxide and adding to a polyol component.
  • the said polyol component will not be specifically limited if it has two or more hydroxyl groups in a molecule
  • the polyol ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1,6- Hexanediol, 1,8-octanediol, 1,10-decanediol, 4,4'-dihydroxyphenylpropane, 4,4'-dihydroxymethylmethane, diethylene glycol, triethylene glycol, polyethylene glycol ( PEG), dipropylene glycol, polytetramethylene glycol (PTMG), polypropylene glycol (PPG), 1,4-cyclohexanedimethanol, 1,4-cyclohexanedi
  • PEG poly
  • polyurethane-based resin may include other polyols or chain extenders in addition to the above components in a range that does not impair the physical properties of the present invention.
  • the other polyol may be, for example, a polyol having three or more hydroxyl groups such as sorbitol, glycerin, trimethylol ethane, trimethylol propane, pentaerythritol, and the like.
  • the other chain extender for example, ethylene glycol, diethylene glycol, triethylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1 Glycols such as, 6-hexanediol, propylene glycol and the like can be used.
  • the polyurethane resin may be further copolymerized with an acrylic monomer component, if necessary, may be a polyacryl urethane resin containing an acrylic unit together with a urethane unit.
  • polyacryl urethane resin there is an advantage in that solvent resistance and transparency are superior to polyurethane resins which do not contain acrylic units.
  • the acrylic monomers usable in the present invention include, for example, alkyl (meth) acrylates, alkyl acrylates, epoxy (meth) acrylates, hydroxy alkyl acrylates, alkyl (meth) acrylic acids including alkyl groups, alkyl acrylic acids, It may be at least one selected from the group consisting of acrylates including sulfonates.
  • the acrylate including the sulfonate is, for example, an acrylate including sodium 2-methyl-2-propene-1-sulfonate, an acrylate including sodium aryl sulfonate, 2-propene-1 Acrylates including sulfonates.
  • the said polyurethane resin may copolymerize another monomer in addition to an acryl monomer component as needed.
  • the other monomers include unsaturated nitriles such as (meth) acrylonitrile; Unsaturated amides such as (meth) acrylic imide and the like; Olefins such as ethylene and propylene; ⁇ -unsaturated aliphatic monomers such as halogenated vinyl chloride and vinylidene chloride; ⁇ -unsaturated aromatic monomers such as styrene, methyl styrene and the like can be used. These can be used individually or in combination of 2 or more types.
  • the polyurethane-based resin may further include a neutralizing agent, if necessary.
  • a neutralizing agent When it contains a neutralizing agent, the stability of the urethane resin in water can be improved.
  • the said neutralizing agent is 1 type or 2 types of ammonia N-methylmorpholine, triethylamine, dimethylethanolamine, methyl diethanolamine, triethanol alkyne, morpholine, tripropylamine, ethanol amine, triisopropanolamine, etc., for example. The above can be used in combination.
  • the polyurethane-based resin is preferably carried out in an organic solvent which is inert to the isocyanate and compatible with water.
  • organic solvent such as ethyl acetate and an ethyl cellosolve acetate; Ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; Ether solvents, such as dioxane tetrahydrofuran, etc. can be used 1 type or in combination of 2 or more types.
  • the polyurethane-based resin usable in the present invention can be prepared using any suitable method known in the art. Specifically, the one-shot method which makes each said component react at once, and the multistage method which reacts in steps are mentioned. In addition, any suitable urethane reaction catalyst can be used in the production of the polyurethane-based resin.
  • the said polyurethane resin contains functional groups, such as a carboxy group, a sulfonate group, a hydroxyl group, or a tertiary amine group.
  • functional groups such as a carboxy group, a sulfonate group, a hydroxyl group, or a tertiary amine group.
  • the polyurethane-based resin containing the functional group is prepared by using a compound containing the functional groups as a polyol and / or isocyanate, or by adding a chain extender including the functional groups in the polyol and isocyanate reaction. Can be.
  • polyurethane-based resins containing carboxyl or tertiary amine groups can be prepared by reacting polyester polyols with isocyanates by adding chain extenders having free carboxyl or free amine groups.
  • chain extender which has the said free carboxy group dihydroxy carboxylic acid, dihydroxy succinic acid, etc. are mentioned, for example.
  • the dihydroxy carboxylic acid may be, for example, dialkylol alkanoic acid including dimethylol alkanoic acid such as dimethylol acetic acid, dimethylol butanoic acid, dimethylol propionic acid, dimethylol butyric acid, dimethylolpentanoic acid and the like.
  • chain extender which has the said free amine group
  • Aliphatic diamine such as ethylenediamine, propylenediamine, hexamethylenediamine, 1, 4- butanediamine, aminoethyl ethanolamine
  • Alicyclic diamines such as isophorone diamine and 4,4'-dicyclohexyl methanediamine
  • Aromatic diamine such as xylylenediamine and tolylenediamine, etc. are mentioned. These can be used 1 type or in combination of 2 or more types.
  • the polyurethane resin is a carbonate-based polyurethane resin using a polycarbonate-based polyol as a reactant or an ester-based polyurethane resin using a polyester-based polyol as a reactant Is particularly preferred.
  • the weight average molecular weight of the polyurethane-based resin is preferably 10,000 to 1 million.
  • the weight average molecular weight of the polyurethane-based resin satisfies the numerical range, sufficient adhesion can be achieved, and water dispersibility is excellent.
  • the second primer layer is for improving adhesion to the functional coating layer, and includes at least one water dispersible resin selected from the group consisting of a water dispersible polyester resin, a water dispersible acrylic resin, and a water dispersible polyester acrylic resin. It is formed by a second primer composition.
  • the second primer composition includes at least one water-dispersible resin and water selected from the group consisting of a water-dispersible polyester resin, a water-dispersible acrylic resin, and a water-dispersible polyester acrylic resin, and, if necessary, water-dispersible fine particles It may further include.
  • the second primer composition is 1 part by weight to 50 parts by weight of at least one water dispersible resin selected from the group consisting of a water dispersible polyester resin, a water dispersible acrylic resin and a water dispersible polyester acrylic resin, and water dispersible fine particles.
  • 0 to 20 parts by weight and the balance may include water, more preferably at least one water dispersible resin selected from the group consisting of a water dispersible polyester resin, a water dispersible acrylic resin and a water dispersible polyester acrylic resin 5 And 30 parts by weight, more than 0 to 10 parts by weight of water-dispersible fine particles and the remainder of water.
  • the 'residue' means the remaining content except the content of the solid content of the total content of the entire primer composition.
  • the water-dispersible polyester resin means a resin containing an ester group formed by the reaction of carboxylic acid and alcohol in the main chain, preferably, may be a water-dispersible polyester resin, more preferably, polybasic acid ( It may include a polyester glycol formed by the reaction of polybasic acid) and polyol (polyol).
  • the polybasic acid component for example, ortho-phthalic acid, isophthalic acid, terephthalic acid, 1,4-naphthalenedicarboxylic acid, 2,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicar
  • Aromatic dicarboxylic acids such as acid, biphenyldicarboxylic acid and tetrahydrophthalic acid;
  • Aliphatic dicarboxylic acids such as oxalic acid, succinic acid, malonic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, linoleic acid, maleic acid, fumaric acid, mesaconic acid and itaconic acid;
  • Alicyclic dicarboxylic acids such as hexahydrophthalic acid, tetrahydrophthalic acid, 1,3-cyclohexanedicarboxylic acid, and 1,4-cyclohexanedicarbox
  • terephthalic acid isophthalic acid, succinic acid and the like are particularly preferable.
  • isophthalic acid substituted by sulfonate it is especially preferable at the point of water dispersibility.
  • polystyrene resin if it has two or more hydroxyl groups in a molecule
  • the polyol ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 1,6- Hexanediol, 1,8-octanediol, 1,10-decanediol, 4,4'-dihydroxyphenylpropane, 4,4'-dihydroxymethylmethane, diethylene glycol, triethylene glycol, polyethylene glycol ( PEG), dipropylene glycol, polytetramethylene glycol (PTMG), polypropylene glycol (PPG), 1,4-cyclohexanedimethanol, 1,4-cyclohexane
  • polydimethylol-containing dimethylol alkanoic acid dimethylol acetic acid, dimethylol propionic acid, dimethylol butanoic acid, etc. which are contained alone or in combination of two or more thereof are particularly preferable in terms of water dispersibility.
  • the polyester glycol reacts the polybasic acid and the polyol in a molar ratio of 2.5: 1 to 1: 2.5, preferably in a molar ratio of 2.3: 1 to 1: 2.3, more preferably, in a molar ratio of 2: 1 to 1: 2. Is preferably formed. This is because when the molar ratio of the polybasic acid and the polyol is out of the reaction, an odor may be generated by the unreacted monomer or a coating defect may be caused.
  • the manufacturing method of the said polyester resin can employ
  • the polyester resin of the present invention may be prepared by a method of polycondensation after esterification of polybasic acid and polyol, or a method of polycondensation after esterification reaction of polybasic anhydride and polyol, and more specifically, The methods include (1) a raw material mixing step of mixing a polymerization raw material for polymerization of polyester to obtain a raw material mixture, (2) an esterification step of esterifying the raw material mixture, and (3) an esterified raw material mixture. It may comprise a polycondensation step to obtain a polyester by polycondensation.
  • the polyester resin used in the present invention manufactured through the above method may include a repeating unit represented by the following [Formula 1].
  • R 1 and R 2 are each independently, hydrogen, substituted or unsubstituted C 1 ⁇ 20 alkyl, substituted or unsubstituted C 6 ⁇ 20 aryl group, or a substituted or unsubstituted C 5 ⁇ 20 cycloalkyl
  • R 3 and R 4 are each independently hydrogen, substituted or unsubstituted C1 ⁇ 20 alkyl, substituted or unsubstituted C 6 ⁇ 20 aryl group, a substituted or unsubstituted C 5 ⁇ 20 cycloalkyl, carboxyl ring , A hydroxy group or a sulfonate group, and at least one of R 3 and R 4 is a carboxy group, a hydroxy group or a sulfonate group.
  • R ⁇ 3> or R ⁇ 4> is a carboxy group or sulfonate group.
  • the polyester resin used in the present invention may include a repeating unit represented by the following [Formula 2].
  • R, R 'and R'' are each independently, hydrogen, substituted or unsubstituted C 1 ⁇ 20 alkyl, substituted or unsubstituted C 6 ⁇ 20 aryl group, a substituted or unsubstituted ring ring C 5-20 cycloalkyl, and the like.
  • the polyester resin may further include additional components in addition to the above components in a range that does not impair the physical properties of the present invention.
  • the acrylic resin refers to a resin containing a repeating unit derived from a (meth) acrylate unit, the acrylic resin of the present invention, for example, by copolymerizing an acrylic monomer or a vinyl monomer containing a sulfonic acid group You can get it. These can be used individually or in combination of 2 or more types. Moreover, you may copolymerize another monomer in addition to a vinyl monomer component.
  • the other monomers include unsaturated nitriles such as (meth) acrylonitrile; Unsaturated amides such as (meth) acrylamide and the like; ⁇ -unsaturated aliphatic monomers such as halogenated vinyl chloride and vinylidene chloride; ⁇ -unsaturated aromatic monomers such as styrene, methyl styrene and the like can be used. These can be used individually or in combination of 2 or more types.
  • the acrylic resin may include a repeating unit represented by the following [Formula 3].
  • R 5 is Hydrogen or substituted or unsubstituted C 1-20 alkyl, preferably hydrogen or methyl,
  • R 6 is hydrogen, substituted or unsubstituted C 1-20 alkyl, epoxy group or hydroxy group.
  • the water-dispersible polyester acrylic resin is a resin comprising an ester repeating unit and an acrylic repeating unit, and may be prepared by copolymerizing an acrylic monomer component to polyester glycol. More specifically, the water-dispersible polyester acrylic resin of the present invention may include an ester repeating unit represented by the above [Formula 1] and an acrylic repeating unit represented by [Formula 3].
  • the polyester glycol is the same as described in the polyester resin.
  • the acrylic monomers for example, alkyl (meth) acrylate, alkyl acrylate, epoxy (meth) acrylate, hydroxy alkyl acrylate, alkyl (meth) acrylic acid, alkyl acrylic acid, sulfonate including a carbonyl group It may be at least one selected from the group consisting of acrylates.
  • the acrylate including the sulfonate is, for example, an acrylate including sodium 2-methyl-2-propene-1-sulfonate, an acrylate including sodium aryl sulfonate, 2-propene-1 Acrylates including sulfonates.
  • the epoxy acrylate monomer containing an epoxy group is copolymerized to the polyester resin among the acrylic monomers, the epoxy ring is dissociated at high temperature to generate an addition polymerization reaction between the epoxy rings and crosslinking to improve the high temperature durability of the polyester main chain. By doing so, there is an advantage that the high temperature stability is increased.
  • the polyester acrylic resin may be prepared by copolymerizing other monomers in addition to the acrylic monomer component, if necessary.
  • the other monomers include unsaturated nitriles such as (meth) acrylonitrile; Unsaturated amides such as (meth) acrylic imide and the like; Olefins such as ethylene and propylene; ⁇ -unsaturated aliphatic monomers such as halogenated vinyl chloride and vinylidene chloride; ⁇ -unsaturated aromatic monomers such as styrene, methyl styrene and the like can be used. These can be used individually or in combination of 2 or more types.
  • the polyester acrylic resin of the present invention may include two or more kinds of acrylic monomers, most preferably an alkyl (meth) acrylate monomer and an epoxy (such as glycidyl (meth) acrylate). Meth) acrylate monomers may be included.
  • the polyester acrylic resin is not limited thereto, but the weight ratio of the polyester glycol and the acrylic monomer in the reactant is about 1: 9 to 9: 1, more preferably about 2: 8 to 8: 2, most Preferably, it may be about 3: 7 to 7: 3.
  • the content of the polyester glycol and the acrylic monomer in the reactant satisfies the numerical range, properties such as adhesion to the functional coating layer and solvent resistance are excellent.
  • the first primer layer and the second primer layer contain water-dispersible fine particles as necessary.
  • water-dispersible fine particles that can be used in the present invention, any suitable fine particles can be used, and for example, inorganic fine particles, organic fine particles or a combination thereof can be used.
  • inorganic fine particles include inorganic oxides such as silica, titania, alumina, zirconia, antimony and the like.
  • organic fine particles include silicone resins, fluorine resins, (meth) acrylic resins, crosslinked polyvinyl alcohols, melamine resins, and the like.
  • silica is particularly preferable. This is because silica is more excellent in blocking inhibitory ability, has excellent transparency, does not generate haze, and there is no coloring, and therefore, the influence on the optical properties of the polarizing plate is smaller. In addition, since colloidal silica has good dispersibility and dispersion stability with respect to the primer composition, the workability at the time of forming the primer layer is also excellent.
  • the water-dispersible fine particles have an average diameter (average primary particle diameter) of about 10 to 200 nm, more preferably about 20 to 150 nm.
  • average diameter of the water-dispersible fine particles is smaller than 10 nm, the surface energy is increased, so that the dispersion and precipitation of the water-dispersible particles in the primer solution may be impaired.
  • the average diameter is larger than 200 nm, the water-dispersible particles may be Dispersion does not occur evenly in the primer solution, and when the particles aggregate, the size is larger than the visible light (400 nm to 800 nm) wavelength and scatters light of 400 nm or more, causing haze to rise.
  • the fine particles are preferably blended into an aqueous dispersion.
  • silica is used as the fine particles, it is preferably blended as colloidal silica.
  • colloidal silica the product marketed in the said technical field can be used as it is, For example, Snowtex series of Nissan Chemical Industries, Ltd., AEROSIL series of Air Products, the epostar series of Japan Catalyst, and the soliostar RA series, Ranco LSH series and the like can be used.
  • the first primer layer and / or the second primer layer may further include a crosslinking agent as necessary.
  • the type of crosslinking agent that can be used is not particularly limited, and various crosslinking agents used in the art, for example, an oxazoline-based crosslinking agent, an aziridine-based crosslinking agent, a carbodiimide-based crosslinking agent, and the like can be used without limitation.
  • the crosslinking agent when the crosslinking agent is included in the first primer layer, the water resistance and the solvent resistance are improved, and thus the adhesive strength with the adhesive layer is improved.
  • the content thereof varies depending on the kind of the crosslinking agent, the resin of the primer layer, and the like, but is generally about 0.01 part by weight to 20 parts by weight, preferably 0.1 part by weight to 100 parts by weight of the primer composition. It may be about 10 parts by weight, more preferably about 0.3 to 8 parts by weight.
  • the acrylic film may be a single layer or a structure in which two or more films are stacked.
  • the stacked films may be made of the same or different materials.
  • the acryl-based film means a film containing a resin containing an acrylate unit and / or methacrylate-based unit as a main component, a homopolymer consisting of an acrylate-based unit or methacrylate-based unit
  • the film includes a copolymer mainly composed of a copolymer resin copolymerized with other monomer units in addition to the acrylate-based and / or methacrylate-based units, and a film formed of a blend resin in which another resin is blended in the acrylic resin as described above. It is a concept.
  • the acrylic film for example, a copolymer containing an alkyl (meth) acrylate unit and a styrene unit; And a film comprising an aromatic resin having a carbonate moiety in the main chain, a film containing an alkyl (meth) acrylate-based unit and a 3-6 membered heterocyclic unit substituted with at least one carbonyl group, or an alkyl (meth) acrylate-based Film may include a unit, a styrenic unit, a 3-6 membered heterocyclic unit substituted with at least one carbonyl group, and a vinyl cyanide unit. In addition, it may be an acrylic film having a lactone structure.
  • the monomer unit copolymerizable with the acrylic resin may include an aromatic vinyl unit, a 3 to 6 membered heterocyclic unit substituted with a carbonyl group, an acrylic acid unit, a glycidyl unit, and the like.
  • the aromatic vinyl unit refers to a unit derived from, for example, styrene, ⁇ -methyl styrene, etc.
  • the 3 to 6 membered heterocyclic unit substituted with the carbonyl group may be, for example, a lactone ring or glutaric acid. It refers to a unit derived from anhydride, glutarimide, maleimide, maleic anhydride and the like.
  • the acrylic film may be a film including a copolymer including alkyl (meth) acrylate-based units and 3 to 10 membered heterocyclic units substituted with at least one carbonyl group.
  • the 3 to 10 membered heterocyclic unit substituted with the carbonyl group may be a lactone ring, glutaric anhydride, glutarimide, maleic anhydride, maleimide, or the like.
  • the acrylic film a film containing a blending resin obtained by blending an acrylic resin with an aromatic resin having a carbonate portion in a main chain thereof may be mentioned.
  • the aromatic resin having a carbonate portion in the main chain may be, for example, polycarbonate resin, phenoxy resin and the like.
  • the method for producing the acrylic resin film is not particularly limited, and for example, the acrylic resin and other polymers, additives, etc. are sufficiently mixed by any suitable mixing method to prepare a thermoplastic resin composition, and then film-molded to produce the thermoplastic resin composition, Alternatively, the acrylic resin and other polymers, additives, etc. may be prepared in a separate solution and mixed to form a uniform mixed solution, and then film-molded.
  • thermoplastic resin composition is prepared by, for example, extrusion kneading the resulting mixture after preblending the film raw material with any suitable mixer such as an omni mixer.
  • the mixer used for extrusion kneading is not specifically limited,
  • arbitrary appropriate mixers such as an extruder, such as a single screw extruder and a twin screw extruder, and a pressurized kneader, can be used.
  • molding methods such as the solution casting method (solution casting method), the melt extrusion method, the calender method, the compression molding method, are mentioned, for example.
  • a solution cast method (solution casting method) and a melt extrusion method are preferable.
  • solvent used for the said solution casting method For example, aromatic hydrocarbons, such as benzene, toluene, 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; Alcohols such as methanol, ethanol, isopropanol, butanol, isobutanol, methyl cellosolve, ethyl cellosolve and butyl cellosolve; Ethers such as tetrahydrofuran and dioxane; Halogenated hydrocarbons such as dichloromethane, chloroform and carbon tetrachloride; Dimethylformamide; Dimethyl sulfoxide, etc. are mentioned. These solvents may be used independently or may use 2 or more types together.
  • melt extrusion method As an apparatus for performing the said solution casting method (solution casting method), a drum type casting machine, a band type casting machine, a spin coater, etc. are mentioned, for example.
  • melt extrusion method include a T-die method and an inflation method. Molding temperature becomes like this. Preferably it is 150 degreeC-350 degreeC, More preferably, it is 200 degreeC-300 degreeC.
  • a T die When forming a film by the said T die method, a T die can be attached to the front-end
  • the acrylic film may be any of an unoriented film or a stretched film.
  • a stretched film it may be a uniaxial stretched film or a biaxially stretched film, and in the case of a biaxially stretched film, it may be either a simultaneous biaxially stretched film or a successive biaxially stretched film.
  • biaxial stretching the mechanical strength is improved and the film performance is improved.
  • an acryl-type film can suppress an increase of retardation even when extending
  • stretching temperature is a range near the glass transition temperature of the thermoplastic resin composition which is a film raw material, Preferably it is (glass transition temperature-30 degreeC)-(glass transition temperature + 100 degreeC), More preferably, it is (glass transition Temperature-20 ° C) to (glass transition temperature + 80 ° C). If the stretching temperature is less than (glass transition temperature-30 ° C), there is a fear that a sufficient stretching ratio may not be obtained. On the contrary, when extending
  • the draw ratio defined by the area ratio is preferably 1.1 times to 25 times, more preferably 1.3 times to 10 times. If the draw ratio is less than 1.1 times, there is a fear that it does not lead to the improvement of the toughness accompanying stretching. When a draw ratio exceeds 25 times, there exists a possibility that the effect by raising a draw ratio may not be recognized.
  • the stretching speed is preferably 10% / min to 20,000% / min, more preferably 100% / min to 10,000% / min in one direction. If the stretching speed is less than 10% / min, it takes a long time to obtain a sufficient draw ratio, there is a fear that the manufacturing cost increases. When the stretching speed exceeds 20,000% / min, breakage of the stretched film may occur.
  • the acrylic film may be subjected to heat treatment (annealing) or the like after the stretching treatment in order to stabilize its optical isotropy and mechanical properties.
  • the heat treatment conditions are not particularly limited and may employ any suitable conditions known in the art.
  • the first primer composition is coated on one surface of the acrylic film to form a first primer layer
  • the second primer composition is coated on the opposite surface to form a second primer layer.
  • the coating may be performed by a method well known in the art, for example, a method of applying and drying the primer composition on a base film using a bar coating method, a gravure coating method, a slot die coating method, or the like. Can be.
  • the drying may be performed through a convection oven or the like, but is not limited thereto. Preferably, the drying may be performed at a temperature of 70 ° C. to 150 ° C. for 5 seconds to 5 minutes.
  • the coating of the primer composition may be carried out before or after the stretching of the acrylic film, in the case of coating the primer composition before stretching, there is an advantage in that the drying and stretching of the primer composition can be performed at the same time.
  • the drying temperature varies depending on the coating step, and in the case of the finished film, the drying temperature may be performed in a range not exceeding the glass transition temperature (Tg) of the film, and in the case of stretching, drying is performed at the stretching temperature at the same time as the stretching. It is carried out in a range not exceeding the decomposition temperature Td.
  • the first primer layer of the present invention may have a thickness of about 50nm to 2000nm, preferably 100nm to 1000nm, more preferably about 100nm to 500nm.
  • the thickness of the second primer layer may be about 50nm to 2000nm, preferably 100nm to 1000nm, more preferably 200nm to 800nm. This is because when the thickness of the first primer layer and the second primer layer satisfies the above range, the adhesion and slip properties of the adhesive layer and the functional coating layer are excellent.
  • the surface treatment may be performed on at least one surface of the acrylic film before forming the primer layer, wherein the surface treatment method may be alkali treatment, corona treatment, and plasma treatment It may be at least one selected from the group consisting of.
  • the optical film used in the present invention is an acrylic film containing no lactone ring, it is preferable to perform the surface treatment.
  • the first primer layer and the second primer layer are formed on both sides of the acrylic film, and then the functional coating layer such as an anti-glare layer, a hard coating layer, an anti-reflection layer, etc. may be laminated on the second primer layer.
  • the functional coating layer such as an anti-glare layer, a hard coating layer, an anti-reflection layer, etc.
  • the water-dispersible resin contained in the second primer layer of the present invention since the solvent resistance is excellent, even when a functional coating layer containing an organic solvent is formed on the second primer layer, the coating layer is peeled off, or the surface of the acrylic film is There is no problem of damage.
  • the functional coating layer may be formed in a variety of compositions according to the function to be given, for example, it may be formed by a composition for forming a functional coating layer containing a binder resin, fine particles, a solvent and the like.
  • the functional coating layer forming composition may be a binder resin well known in the art, such as acrylic binder resin.
  • the type of the acrylic binder resin is not particularly limited and may be selected without particular limitation as long as it is known in the art.
  • the acrylic binder resin may be an acrylate monomer, an acrylate oligomer, a mixture thereof, or the like.
  • the acrylate monomer or acrylate oligomer preferably comprises at least one or more acrylate functional groups capable of participating in the curing reaction.
  • the kind of the acrylate monomer and the acrylate oligomer is not particularly limited, and may be used without particular limitation to those commonly used in the art.
  • acrylate oligomer urethane acrylate oligomer, epoxy acrylate oligomer, polyester acrylate, polyether acrylate or a mixture thereof may be used.
  • acrylate monomer dipentaerythritol hexaacrylate, dipentaerythritol hydroxy pentaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylene propyl triacrylate, propoxylated glycerol triacrylate , Trimethyllopropane ethoxy triacrylate, 1,6-hexanediol diacrylate, propoxylated glycerol triacrylate, tripropylene glycol diacrylate, ethylene glycol diacrylate or mixtures thereof, and the like are preferable. Although it may be used, it is not necessarily limited to these examples.
  • the fine particles are not necessarily included in the functional coating layer, it may be included, if necessary, may not be included.
  • the fine particles organic fine particles, inorganic fine particles, or a mixture thereof may be used, and the content of the fine particles is not limited thereto, but may be about 0.1 part by weight to about 100 parts by weight based on 100 parts by weight of the binder resin.
  • the content of the fine particles satisfies the numerical range, there is an advantage in that sufficient unevenness is formed in the coating film and the coating property is good.
  • the inorganic fine particles may be used as a single selected from silica, silicon particles, aluminum hydroxide, magnesium hydroxide, alumina, zirconia, titania, or two or more thereof, but are not necessarily limited thereto.
  • the organic fine particles are polystyrene, polymethyl methacrylate, polymethyl acrylate, polyacrylate, polyacrylate-co-styrene, polymethylacrylate-co-styrene, polymethylmethacrylate-co-styrene, polycarbonate , Polyvinyl chloride, polybutylene terephthalate, polyethylene terephthalate, polyamide, polyimide, polysulfone, polyphenylene oxide, polyacetal, epoxy resin, phenol resin, silicone resin, melamine resin, benzoguamine, At least one selected from polydivinylbenzene, polydivinylbenzene-co-styrene, polydivinylbenzene-co-acrylate, polydiallylphthalate and triallyl isocyanurate polymer or two or more copolymers thereof ( copolymer) can be used.
  • the solvent is not limited thereto, but may be included in an amount of about 50 parts by weight to about 1000 parts by weight based on 100 parts by weight of the binder resin.
  • the content of the solvent satisfies the numerical range, the coating property of the functional coating layer is excellent, the film strength of the coating film is excellent, and it is easy to prepare a thick film.
  • the kind of solvent usable in the present invention is not particularly limited, and an organic solvent may be used in general.
  • C 1 to C 6 lower alcohols, acetates, ketones, cellosolves, dimethylformamide, tetrahydrofuran, propylene glycol monomethyl ether, toluene, and xylene are selected from the group consisting of The above can be used.
  • the lower alcohols are one selected from methanol, ethanol, isopropyl alcohol, butyl alcohol, isobutyl alcohol and diacetone alcohol
  • the acetates are methyl acetate, ethyl acetate, isopropyl acetate, and butyl acetate.
  • cellosolve acetate, and the ketones may be one selected from methyl ethyltone, methyl isobutyl ketone, acetylacetone, and acetone, but are not limited thereto.
  • the composition for forming a functional coating layer according to the present invention may further include a UV curing initiator added for the purpose of curing through UV irradiation.
  • the UV curing initiator is selected from among 1-hydroxy cyclohexylphenyl ketone, benzyl dimethyl ketal, hydroxydimethylacetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin butyl ether. It may be one single or a mixture of two or more selected, but is not limited thereto.
  • the said UV curing initiator is added in 0.1 weight part-10 weight part with respect to 100 weight part of said binder resins.
  • the content of the UV curing initiator satisfies the numerical range, sufficient curing may occur and the film strength of the film may be improved.
  • composition for forming a functional coating layer according to the present invention may further include one or more additives selected from a leveling agent, a wetting agent, and an antifoaming agent.
  • the additive may be added in an amount of 0.01 parts by weight to 10 parts by weight based on 100 parts by weight of the binder resin.
  • the thickness of the functional coating layer is not limited thereto, but may be about 1 ⁇ m to about 30 ⁇ m, and preferably about 1 ⁇ m to about 20 ⁇ m.
  • the thickness of the functional coating layer satisfies the numerical range, it is possible to prevent the occurrence of cracks, while implementing sufficient functionality.
  • the functional coating layer may be formed by applying a composition for forming a functional coating layer on the second primer layer, and then drying and / or curing the coating, wherein the coating is well known in the art.
  • the coating may be made by wet coating such as roll coating, bar coating, spray coating, dip coating and spin coating.
  • the coating method is not limited thereto, and various other coating methods used in the art may be used.
  • the drying and / or curing may be made by a method of irradiating heat and / or light to the functional coating layer formed composition applied on the second primer layer, and may proceed in the drying step and curing step sequentially, You can also proceed.
  • the curing step is more preferably performed through a method of irradiating light such as UV.
  • the curing conditions may be appropriately adjusted according to the blending ratio or components of the composition for forming a functional coating layer, for example, in the case of electron beam or ultraviolet curing, the irradiation dose of 0.01 J / cm2 to 2 J / cm2 1 It may be about 10 to 10 minutes.
  • the binder resin when the curing time satisfies the numerical range, the binder resin may be sufficiently cured, and thus mechanical properties such as wear resistance may be excellent, and the durability of the acrylic film may be improved.
  • the functional coating layer may be made of a single layer structure, may be made of a multi-layer structure of two or more layers.
  • Acrylic film of the present invention as described above can be usefully used as a protective film for a polarizing plate. More specifically, the present invention is a polarizer; An acrylic film of the present invention disposed on at least one surface of the polarizer; And an adhesive layer interposed between the polarizer and the acrylic film, wherein the first primer layer of the acrylic film is disposed on the adhesive layer side.
  • polarizers generally used in the art may be used without limitation.
  • a polarizer prepared by dyeing, crosslinking and stretching a dichroic dye and / or iodine in a polyvinyl alcohol-based film may be used.
  • a first primer layer including a water dispersible polyurethane resin is formed on one surface, and at least one of water dispersible polyester resin, water dispersible acrylic resin, and water dispersible polyester acrylic resin is formed on the opposite side. Since it is an acryl-type film in which the 2nd primer layer was formed, the specific matters of the said 1st primer layer and the 2nd primer layer are the same as that mentioned above, detailed description is abbreviate
  • the adhesive layer for the attachment of the polarizer and the acrylic film may be made of water-based or non-aqueous adhesives generally used in the art, for example, polyvinyl alcohol-based adhesives, acrylic adhesives, epoxy-based adhesives. Adhesives, urethane-based adhesives and the like can be used without limitation.
  • a polyvinyl alcohol adhesive is preferred among these, and a modified polyvinyl alcohol adhesive including an acetoacetyl group is particularly preferable.
  • Specific examples of the polyvinyl alcohol-based adhesive may include, but are not limited to, Japan Synthetic Chemicals Gohsefiner Z-100, Z-200, Z-200H, Z-210, Z-220, Z-320, and the like.
  • the non-aqueous adhesive may be an ultraviolet curable type, and is not particularly limited.
  • an adhesive using a photoradical polymerization reaction such as a (meth) acrylate adhesive, an N / thiol adhesive, an unsaturated polyester adhesive, Adhesives using photo cationic polymerization such as epoxy adhesives, oxetane adhesives, epoxy / oxetane adhesives, and vinyl ether adhesives.
  • Adhesion of the polarizer and the protective film layer using the non-aqueous adhesive may be performed by applying an adhesive composition to form an adhesive layer, then laminating the polarizer and the protective film and curing the adhesive composition through light irradiation.
  • the polarizing plate according to the present invention as described above has excellent adhesive strength with the adhesive layer and the functional coating layer, and also has excellent slip property and anti blocking property.
  • optical film or the polarizing plate of the present invention can be usefully applied to various image display devices such as liquid crystal display devices.
  • CK-PAD is the trade name of the polyester acrylic resin sold by the light paint company
  • A-645GH is the trade name of the polyester acrylic resin sold by Takamatsu oil & fat
  • CK-PUD -1004A is a brand name of the polyurethane resin sold by Dye Paint
  • CK-PUD-PF is a brand name of polyurethane resin sold by Dye Paint.
  • the composition for 1st primer layer was applied, and then stretched in the TD direction at 135 ° C. to prepare acrylic films having the first primer layer and the second primer layer.
  • the first primer layer composition and the second primer layer composition used are as described in Table 3 below.
  • the thickness of the first primer layer was 300 nm and the thickness of the second primer layer was 700 nm.
  • an acrylic UV-curable hard coating solution was applied onto the second primer layer, and hot-air dried at 60 ° C. for 2 minutes, followed by UV curing to prepare an acrylic film having a UV-curable hard coating layer formed thereon.
  • the UV curable hard coating layer is positioned at the outermost side of the polarizing plate and laminated in the order of the acrylic film / PVA device / acrylic film with hard coating formed thereon, and after the UV curable adhesive is applied between the films, the thickness of the final adhesive layer is increased.
  • the conditions were set so that it might be set to 1-2 micrometers, and the laminator passed through.
  • a polarizing plate was prepared by irradiating ultraviolet rays to the surface on which the acrylic film without hard coating is laminated.
  • a polarizing plate was manufactured in the same manner as in Examples 1 to 4, except that an acrylic film using no first primer layer and a second primer layer was used.
  • a polarizing plate was manufactured in the same manner as in Example 1 except that the C composition prepared in Preparation Example 3 was used as the composition for the second primer layer.
  • a polarizing plate was manufactured in the same manner as in Example 1 except for using the (C) composition prepared according to Preparation Example 6 as the composition for the first primer layer.
  • Peel force of the polarizer and the acrylic film of the polarizing plates manufactured according to Examples 1 to 4 and Comparative Examples 1 to 4 were measured.
  • the peeling experiment measured the peeling force at the time of peeling at the speed
  • Examples 1 to 4 and the UV curable hard coating layer of the polarizing plate prepared according to Comparative Examples 1 to 4 was cut out of a 10x10 sheath with a width of 1mm on the tape and then peeled off to evaluate the adhesion to the extent that the coating layer fell. If there are 0 to 20 falling cells, it is OK. If there are 21 or more falling cells, NG is evaluated. The results are shown in the following [Table 4].

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Abstract

La présente invention concerne une plaque polarisante comprenant un film optique acrylique, où une première couche d'apprêt comprenant une résine de polyuréthane dispersible dans l'eau est formée sur une surface du film optique acrylique, et une seconde couche d'apprêt comprenant une résine de polyester dispersible dans l'eau et/ou une résine acrylique dispersible dans l'eau est formée sur l'autre surface du film optique acrylique.
PCT/KR2014/008799 2013-09-30 2014-09-23 Film optique acrylique et plaque polarisante le comprenant WO2015046844A1 (fr)

Priority Applications (4)

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US15/024,731 US9945986B2 (en) 2013-09-30 2014-09-23 Acrylic optical film, and polarizing plate comprising same
EP14848040.3A EP3053946B1 (fr) 2013-09-30 2014-09-23 Film optique acrylique et plaque polarisante le comprenant
CN201480054154.7A CN105658708B (zh) 2013-09-30 2014-09-23 丙烯酸光学膜以及包括其的偏光板
JP2016545682A JP6415576B2 (ja) 2013-09-30 2014-09-23 アクリル系光学フィルム、これを含む偏光板

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KR10-2014-0124602 2014-09-18
KR1020140124602A KR101549791B1 (ko) 2013-09-30 2014-09-18 아크릴계 광학 필름, 이를 포함하는 편광판

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190033495A1 (en) * 2016-09-20 2019-01-31 Lg Chem, Ltd. Optical film having high adhesiveness and polarizing plate comprising the same

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Publication number Priority date Publication date Assignee Title
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