WO2015046841A1 - 내용제성이 우수한 광학 필름 및 이를 포함하는 편광판 - Google Patents
내용제성이 우수한 광학 필름 및 이를 포함하는 편광판 Download PDFInfo
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- WO2015046841A1 WO2015046841A1 PCT/KR2014/008790 KR2014008790W WO2015046841A1 WO 2015046841 A1 WO2015046841 A1 WO 2015046841A1 KR 2014008790 W KR2014008790 W KR 2014008790W WO 2015046841 A1 WO2015046841 A1 WO 2015046841A1
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- film
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- acrylic
- coating layer
- acid
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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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
- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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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
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
- C08G77/16—Polysiloxanes containing silicon bound to oxygen-containing groups to hydroxyl groups
Definitions
- the present invention relates to an optical film having excellent solvent resistance and a polarizing plate including the same.
- the conventional polarizing plate is a protective film for protecting a polyvinyl alcohol polarizing film is mostly used a triacetyl cellulose film having characteristics such as high light transmittance, optical isotropy, defect-free surface.
- a triacetyl cellulose film having characteristics such as high light transmittance, optical isotropy, defect-free surface.
- the triacetyl cellulose film is weak to heat and humidity, there is a problem in that, when used for a long time in an environment of high temperature and high humidity, light leakage phenomenon in which the edge light is excessively leaked due to deterioration of polarization degree and moisture deterioration occurs.
- a film having a high moisture resistance and low retardation properties such as cycloolefin resin or acrylic resin
- acrylic films are known to have advantages in terms of cost as well as optical properties and durability.
- a protective coating layer such as an anti-glare layer, an anti-reflection layer, and / or a hard coating layer may be formed on the surface of the protective film.
- the acrylic film may have solvent resistance. The lack of adhesion to such a functional coating layer is not made smoothly, the film is melted even if the coating layer is formed, the utilization thereof is limited.
- the present invention is to solve the above problems, to provide an optical film having excellent transparency and excellent solvent resistance.
- the present invention includes a transparent film and a coating layer on at least one surface of the transparent film, the coating layer is a polymer resin containing a hydroxyl group; At least one crosslinker selected from the group consisting of a titanate crosslinker and a zirconate crosslinker; And a water dispersible coating composition comprising water dispersible fine particles.
- the present invention provides a polarizer, comprising a polarizer, the optical film according to the invention on at least one side of the polarizer.
- the protective film according to the present invention includes a coating layer, when the functional surface coating layer such as anti-glare, anti-reflection or hard coating is required on the outer surface of the polarizing plate with excellent solvent resistance, its formation is very easy.
- the present inventors have conducted research to develop an optical film that does not cause problems such as film surface damage or peeling of the coating layer when the functional surface coating layer is applied, and as a result, a coating composition comprising a polymer resin having a hydroxyl group and a specific crosslinking agent component When the coating layer is formed on the surface of the film, it was found that the solvent resistance of the film can be significantly improved, and thus the present invention was completed.
- the optical film of the present invention comprises a transparent film and a coating layer on at least one surface of the transparent film, the coating layer is a polymer resin containing a hydroxyl group; At least one crosslinker selected from the group consisting of a titanate crosslinker and a zirconate crosslinker; And a water dispersible coating composition comprising water dispersible fine particles.
- the polymer resin may be a water-dispersible polymer resin containing a hydroxy group, and the kind thereof is not particularly limited.
- polymer resin usable in the present invention include, but are not limited to, polyurethane resins, polyester resins, acrylic resins, polyurethane acrylate resins, polyester acrylic resins, polyester urethane resins, or mixtures thereof. It doesn't happen.
- the polyurethane resin refers to a resin containing a urethane repeating unit formed by the reaction of a polyol and an isocyanate in the main chain, wherein the polyol may be used without limitation compounds containing two or more hydroxyl groups, for example, polyester-based polyols, polycarbonate-based polyols, polyether polyols, polyacrylic polyols and the like can be used, and the isocyanate can be used without limitation compounds having two or more NCO groups.
- the isocyanate component for example, toluene diisocyanate (TDI), 4,4-diphenylmethane diisocyanate (MDI), 1,5-naphthalene diisocyanate (NDI), tolidine diisocyanate (TODI) , Alone or two from the group consisting of hexamethylene diisocyanate (HMDI), isopron diisocyanate (IPDI), p-phenylene diisocyanate, transcyclohexane, 1,4-diisocyanate and xylene diisocyanate (XDI)
- HMDI hexamethylene diisocyanate
- IPDI isopron diisocyanate
- p-phenylene diisocyanate p-phenylene diisocyanate
- transcyclohexane 1,4-diisocyanate
- XDI xylene 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 may be obtained by reacting a compound having a carbonate group with a polyol component.
- the compound having a 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
- a polyacryl polyol can be obtained by copolymerizing the acryl monomer containing a hydroxyl group or the acryl monomer containing a sulfonic acid group, and the monomer which has a hydroxyl group.
- the monomers having an acrylic monomer and a hydroxyl group may be used alone or in combination of two or more.
- the other monomers include unsaturated nitriles such as (meth) acrylonitrile; Unsaturated amides such as (meth) acrylamide and the like; Olefins such as (ethylene, propylene) 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 polyester resin refers to 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 acid) and a polyester glycol formed by the reaction of a 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
- the polyol is not particularly limited as long as it has two or more hydroxyl groups in the molecule, and any appropriate polyol can be employed.
- 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-cyclohexanediol, bisphenol A
- dimethylol alkanoic acid dimethylol acetic acid, dimethylol propionic acid, dimethylol butanoic acid, etc. which contain a carboxyl group as a polyol individually or in combination of 2 or more types, it is especially preferable at the point 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 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 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 said acrylic resin means resin containing the repeating unit derived from the (meth) acrylate unit
- the acrylic resin of this invention can be obtained by copolymerizing an acryl monomer or a vinyl monomer. 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 polymer resin of the present invention may include two or more of an ester repeating unit, a urethane repeating unit, and an acryl repeating unit.
- the polymer resin of the present invention may be a polyester urethane resin including both an ester-based repeating unit and a urethane-based repeating unit, or may be a polyester acrylic resin including both an ester-based repeating unit and an acryl-based repeating unit, It may be a polyurethane acrylic resin including both a urethane-based repeating unit and an acryl-based repeating unit, or may include all three repeating units.
- the polyester acrylic resin is a resin containing an ester repeating unit and an acrylic repeating unit, it may be prepared by copolymerizing an acrylic monomer component in polyester glycol. More specifically, the polyester acrylic resin of the present invention may include the above-described ester repeating unit and acrylic repeating unit. In this case, the polyester unit serves to increase the adhesion of the substrate and the acrylic unit may further improve the solvent resistance.
- the acrylic monomers that can be used include, for example, alkyl (meth) acrylates, alkyl acrylates, epoxy (meth) acrylates, hydroxy alkyl acrylates, alkyl (meth) acrylic acids including alkyl groups, alkyl acrylic acids, and sulfonic acids. It may be at least one selected from the group consisting of acrylates including salts.
- the acrylate including the sulfonate may be, for example, an acrylate including sodium 2-methyl-2-propene-1-sulfonate, an acrylate including sodium aryl sulfonate, or 2propene-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 said polyester 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 polyester resin of the present invention may include two or more kinds of acrylic monomers, most preferably an alkyl (meth) acrylate monomer and an epoxy (meth) such as glycidyl (meth) acrylate. ) Acrylate monomers may further 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 resin and the acrylic monomer in the reactant satisfies the numerical range, properties such as adhesion to the substrate and solvent resistance are excellent.
- the said polyester urethane type resin contains an ester type repeating unit and a urethane type repeating unit together, and can be formed, for example by making an isocyanate react with the polyester resin mentioned above.
- the equivalent ratio of the polyester resin and the isocyanate may be, for example, 2: 1 to 1: 2, preferably 1.5: 1 to 1: 1.5, and more preferably 1.2: 1 to 1: 1.2.
- the equivalent ratio satisfies the above numerical range, the appearance characteristics of the coating layer formed using the coating composition including the same may be very excellent, and properties such as adhesion to the substrate and solvent resistance may be further improved.
- the polyurethane acrylic resin is a resin containing a urethane unit and an acrylic unit, it may be prepared by further copolymerizing an acrylic monomer component in the polyurethane resin.
- solvent resistance and transparency may be further improved as compared with the polyurethane resin that does not contain an acrylic unit.
- the acryl-type monomer which can be used may be alkyl (meth) acrylate, alkyl acrylate, epoxy (meth) acrylate, hydroxy alkyl acrylate, alkyl (meth) acrylic acid containing a carbonyl group, alkyl acrylic acid, sulfonic acid, for example. It may be at least one selected from the group consisting of acrylates including salts.
- 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 acrylic 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 acrylic resin is not limited thereto, but the weight ratio of the polyurethane resin and the acrylic monomer may be about 1: 9 to 9: 1, more preferably 2: 8 to 8: 2. This is because when the weight ratio of the polyurethane resin and the acrylic monomer satisfies the numerical range, it is easy to secure transparency and excellent coating property, thereby making it easy to form a coating layer.
- the polymer resin may further include additional components in addition to the components within a range that does not impair the physical properties of the present invention.
- the polymer resin of the present invention may further include a functional group such as a carboxyl group, a sulfonate group, and the like, in addition to the hydroxy group.
- the polymer resin having a functional group such as the carboxyl group or sulfonate group may be prepared by using a monomer including the functional groups in the synthesis of the polymer resin, wherein the monomer including the carboxyl group and the sulfonate group is used to prepare the polymer resin. It is preferably included in an amount of about 1 to 20% by weight based on the total monomer mixture.
- the coating composition of the present invention comprises a titanate crosslinker and / or a zirconate crosslinker.
- the crosslinking agent binds to the hydroxyl group of the polymer resin to induce bonding between the polymers and serves to improve solvent resistance.
- the titanate-based crosslinking agent and / or zirconate-based crosslinking agent are used as described above, it is possible to obtain an excellent solvent resistance improving effect with less content than when using other types of crosslinking agents.
- a crosslinking agent containing a titanium atom may be used without limitation, and for example, a compound represented by the following Chemical Formula 1 may be used.
- R 1 to R 4 may each independently be a C 1-4 alkoxy group, a chelating group or a hydroxyl group, wherein the chelating group is lactate, triethanol aluminate, acetylacetonate, acetoacetate Or ethyl acetoacetate.
- R 1 to R 4 may be the same or different from each other.
- a crosslinking agent containing a zirconium atom may be used without limitation, and for example, a compound represented by the following Chemical Formula 2 may be used.
- R 5 to R 8 may be each independently, a C 1-4 alkoxy group, a chelating group or a hydroxyl group, wherein the chelating group is lactate, triethanol aluminate, acetylacetonate, acetoacetate Or ethyl acetoacetate.
- the R 5 to R 8 may be the same or different from each other.
- titanate and zirconate crosslinking agents may be used as the crosslinking agent.
- a Tyzor series of Dorf Ketal, an orgatix series of Matsumoto fine chemical, etc. may be used.
- the content of the crosslinking agent may be 0.01 to 10 parts by weight, 0.03 to 10 parts by weight or 0.05 to 7 parts by weight based on 100 parts by weight of the polymer resin containing a hydroxyl group.
- the content of the crosslinking agent satisfies the numerical range, the coating property and storage stability of the coating solution are excellent.
- the higher the content of the crosslinking agent the better the solvent resistance.
- the surface coating layer is formed on the coating layer formed using the water dispersible coating composition, the adhesion between the coating layer and the surface coating layer is also significantly improved.
- there is an advantage that the slip properties of the protective film is improved.
- the water-dispersible microparticles that can be used in the water-dispersible coating composition in the present invention may use any suitable microparticles, for example, inorganic microparticles, organic microparticles or a combination thereof.
- the inorganic fine particles may be, for example, inorganic oxides such as silica, titania, alumina, zirconia, antimony and zinc.
- the organic fine particles may be, for example, silicone resin, fluorine resin, (meth) acrylic resin, crosslinked polyvinyl alcohol, melamine resin, or the like.
- the content of the water-dispersible fine particles may be 0.01 to 20 parts by weight, 0.05 to 15 parts by weight or 0.1 to 10 parts by weight based on 100 parts by weight of the polymer resin containing a hydroxyl group.
- the slip between films during the winding is good, the antiblocking property is improved, and the winding property is improved, and the defective rate of the film after the winding is significantly improved.
- the scratch resistance is improved, and the haze value is low, so there is an advantage of excellent transparency of the film.
- the water dispersible fine particles are preferably silica.
- silica is more excellent in blocking inhibiting ability, has excellent transparency, generates little haze, and has no coloring, and therefore has less influence on the optical properties of the polarizing plate.
- colloidal silica has good dispersibility and dispersion stability with respect to the water dispersible coating composition, workability at the time of forming the coating layer is also excellent.
- the water-dispersible fine particles preferably have an average diameter (average primary particle diameter) of about 50 nm to 500 nm or about 100 nm to 300 nm.
- the coating solution is excellent in stability, and the haze is low because the dispersion is uniform in the solution.
- irregularities are appropriately formed on the surface of the coating layer, and in particular, the frictional force on the contact surface between the acrylic film and the coating layer, the contact surface between the coating layers, and the like can be effectively reduced. As a result, the blocking inhibiting ability can be further excellent.
- the fine particles are preferably formulated into a water 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 by Nissan Chemical Industries, Ltd., AEROSIL series by Air Products, the epostar series by Japan Catalyst, and the soliostar RA series, Ranco LSH series and the like can be used.
- the water-dispersible coating composition used when forming a coating layer in the optical film according to the present invention is at least one crosslinking agent selected from the group consisting of 100 parts by weight of a polymer resin containing a hydroxy group, a titanate crosslinking agent and a zirconate crosslinking agent 0.01 to 10 Most preferably, it is included by weight and 0.01 to 20 parts by weight of water dispersible fine particles.
- the coating layer formed of the water-dispersible coating composition as described above has excellent solvent resistance to improve adhesion to the surface coating layer or the non-aqueous adhesive, and also has excellent slip property.
- the transparent film may be a single layer or a structure in which two or more films are laminated, and in the case of a structure in which two or more films are laminated, the laminated films may be made of the same or different materials. have.
- the transparent film is not limited thereto, but, for example, polyethylene film, polyurethane film, polypropylene film, polyolefin film, ester film, acrylic film, polyethylene terephthalate film, polyvinyl alcohol film and And / or a cellulose film or the like can be used.
- the transparent film of the present invention is preferably an acrylic film.
- the acryl-based film means a film containing a resin containing an acrylate-based unit and / or methacrylate-based unit as a main component, and not only a homopolymer resin composed of an acrylate-based unit or a methacrylate-based unit, but also an acrylic
- the rate-based unit and / or the methacrylate-based unit it is a concept including a film composed mainly of copolymer resin copolymerized with other monomer units and a film formed of a blend resin in which another resin is blended in the acrylic resin as described above.
- the acrylic film may include, for example, a copolymer including an alkyl (meth) acrylate-based unit and a styrene-based unit; And a film comprising an aromatic resin having a carbonate portion in the main chain, a film containing an alkyl (meth) acrylate-based unit and a 3 to 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.
- 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 film is not particularly limited, and for example, (meth) acrylate resin and other polymers, additives, etc. are sufficiently mixed by any suitable mixing method to prepare a thermoplastic resin composition, which is then film-molded. Or (meth) acrylate-based resin and other polymers, additives and the like may be prepared in a separate solution and then 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 150-350 degreeC, More preferably, it is 200-300 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 or mechanical properties.
- the heat treatment conditions are not particularly limited and may employ any suitable conditions known in the art.
- the step of forming the coating layer is a method well known in the art, for example, a bar coating method, gravure coating method, slot die coating method, etc. by applying a water dispersible coating composition on the base film And drying.
- the drying may be performed through a convection oven or the like, but is not limited thereto.
- the drying is performed at a temperature of 90 ° C. to 150 ° C. for 10 seconds to 5 minutes.
- the drying temperature is different depending on the coating step, in the case of the finished film can be carried out in the range not exceeding the glass transition temperature (Tg) of the film, and in the case of stretching, the drying is carried out at the stretching temperature simultaneously with the film Is carried out in a range not exceeding the decomposition temperature (Td).
- the thickness of the coating layer may be 50nm to 2000nm, 100nm to 1000nm or 200nm to 800nm.
- the thickness of the coating layer satisfies the numerical range, it is excellent in adhesiveness, adhesion and winding property.
- the friction coefficient of the coating layer may be, for example, 0 to 0.6, but is not limited thereto.
- the friction coefficient refers to the relative ratio of the friction force divided by the vertical drag.
- the transparency (haze) of the coating layer may be 0 to 5 or 0.1 to 3. The lower the transparency of the coating layer, the better. If the transparency satisfies the numerical range, the transparency of the film is excellent.
- the optical film according to the present invention may be surface-treated on at least one surface of the transparent film before the coating layer is formed in order to improve adhesion or adhesion, wherein the surface treatment method is an alkali treatment, a corona treatment and a plasma. It may be at least one selected from the group consisting of processing.
- the optical film used for this invention is an acrylic film which does not contain a lactone ring, it is preferable to perform the said surface treatment.
- the optical film according to the present invention may optionally further include a surface coating layer on at least one surface of the transparent film on which the coating layer is formed.
- the surface coating layer refers to a functional layer such as anti-glare, anti-reflection or hard coating.
- the surface coating composition for forming the surface coating layer may be formed in a variety of compositions according to the function to be given, for example, may include a binder resin, fine particles and a solvent, further comprising an additive as necessary. You may.
- the surface coating layer-forming composition may be a urethane acrylic resin or the like as a binder resin, and organic fine particles and inorganic fine particles may be used as the fine particles.
- the surface coating composition is preferably UV curable.
- the method of forming the surface coating layer may be made including a coating step and a drying and curing step.
- the drying and curing steps may be divided or proceed to one step.
- the curing step is preferably performed by using ultraviolet light.
- the optical film of the present invention may be further provided with a separate layer for other purposes in addition to the surface coating layer.
- a separate layer for other purposes in addition to the surface coating layer.
- an antifouling layer for preventing contamination of the display surface may be further provided, and various other purpose layers may be further provided without limitation.
- the polarizing plate of this invention is characterized by including the said optical film which concerns on this invention on at least one surface of a polarizer and the said polarizer.
- the polarizer is not particularly limited, and a film made of polyvinyl alcohol (PVA) including a polarizer well known in the art, for example, iodine or a dichroic dye, may be used.
- PVA polyvinyl alcohol
- the polarizer means a state not including a protective film (transparent film)
- the polarizing plate means a state including a protective film (transparent film).
- the polarizing plate according to the present invention may further include an adhesive layer on one side or both sides of the polarizer.
- the structure of one surface of the polarizer may be configured as [transparent film / coating layer / adhesive layer / polarizer], but is not limited thereto.
- the adhesive that can be used when forming the adhesive layer may be an aqueous or non-aqueous adhesive generally used in the art.
- aqueous adhesive for example, polyvinyl alcohol adhesive, acrylic adhesive, epoxy adhesive, urethane adhesive may be used without limitation.
- polyvinyl alcohol-based adhesives are preferred among these, and among these, in the case of using a modified polyvinyl alcohol adhesive including an acetoacetyl group, the adhesiveness can be further improved.
- Japan Synthetic Chemicals Gohsefimer (trade name) Z-100, Z-200, Z-200H, Z-210, Z-220, Z-320 and the like may be used. no.
- the adhesive between the polarizer and the protective film layer using the water-based adhesive is an adhesive using a roll coater, a gravure coater, a bar coater, a knife coater, or a capillary coater on the surface of a polarizer protective film or a PVA film that is a polarizer.
- the first coating, and before the adhesive is completely dried, the protective film and the polarizing film may be carried out by a method of laminating by heat compression or room temperature compression with a lamination roll. In the case of using a hot melt adhesive, a heat press roll should be used.
- 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 optical film using the non-aqueous adhesive may be performed by applying an adhesive composition to form an adhesive layer, then laminating the polarizer and the optical film and curing the adhesive composition through light irradiation.
- the polarizing plate according to the present invention manufactured as described above may be used in various applications. Specifically, it can be preferably used for an image display device including a polarizing plate for liquid crystal display (LCD), an anti-reflective polarizing plate of an organic EL display device, and the like.
- the polarizing plate according to the present invention combines various optical layers such as retardation plates, light diffusing plates, viewing angle expanding plates, brightness enhancing plates, reflecting plates, etc., for various functional films, for example, ⁇ / 4 plates and ⁇ / 2 plates. It can be applied to one composite polarizer.
- the polymer resin, the crosslinking agent, silica and water were mixed in the composition and content shown in the following [Table 1] to prepare water dispersible coating compositions (A) to (G).
- CK-PUD-1004A is a brand name of the polyurethane-based resin sold by the light paint company
- A645GH is a brand name of the polyester acrylic resin sold by Takamatsu oil & fat
- Tyzor LA and Tyzor 217 is Dorf Ketal company Titanate crosslinking agent sold under the trade name.
- LGMMA PMMA830HR poly (cyclohexylmaleimide-co-methylmethacrylate) (LGMMA PMMA830HR) resin was used to prepare an unstretched film having a width of 800 mm using a T-die film making machine at 250 ° C. and 250 rpm, and then at 135 ° C. A film stretched 1.8 times in the MD direction was prepared.
- the water-dispersible coating composition (A) was coated on both sides of the stretched acrylic film with a Mayer bar. Then, the film was stretched 2.0 times in the TD direction at 135 ° C. to prepare an acrylic film having a coating layer formed on both surfaces thereof. At this time, the thickness of the coating layer was 600nm.
- An acrylic film was prepared in the same manner as in Example 1, except that (B) was used as the water dispersible coating composition.
- An acrylic film was prepared in the same manner as in Example 1, except that (C) was used as the water dispersible coating composition.
- An acrylic film was prepared in the same manner as in Example 1, except that (D) was used as the water dispersible coating composition.
- An acrylic film was prepared in the same manner as in Example 1, except that (E) was used as the water dispersible coating composition.
- An acrylic film was prepared in the same manner as in Example 1, except that (F) was used as the water dispersible coating composition.
- Example 1 A ⁇ 0.6 Example 2 B ⁇ 0.6 Example 3 C ⁇ 0.6 Example 4 D ⁇ 0.6 Comparative Example 1 E X 0.5 Comparative Example 2 F ⁇ 0.5 Comparative Example 3 G ⁇ 0.6
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
Abstract
Description
구분 | 고분자 수지 | 가교제 | 실리카 | 물(g) | ||||
종류 | 함량(g) | 종류 | 함량(g) | 종류 | 함량(g) | |||
제조예 1 | A | CK-PUD-1004A(고형분 30%) | 40 | Tyzor LA(고형분 50%) | 1.2 | 100nm(고형분 20%) | 3.0 | 55.8 |
제조예 2 | B | CK-PUD-1004A(고형분 30%) | 40 | Tyzor 217(고형분 100%) | 0.6 | 100nm(고형분 20%) | 3.0 | 56.4 |
제조예 3 | C | A645GH | Tyzor LA(고형분 50%) | 1.2 | 100nm(고형분 20%) | 3.0 | 55.8 | |
제조예 4 | D | A645GH | 40 | Tyzor 217(고형분 100%) | 0.6 | 100nm(고형분 20%) | 3.0 | 56.4 |
제조예 5 | E | CK-PUD-1004A(고형분 30%) | 40 | - | - | 100nm(고형분 20%) | 3.0 | 57 |
제조예 6 | F | A645GH | 40 | - | - | 100nm(고형분 20%) | 3.0 | 57 |
제조예 7 | G | CK-PUD-1004A(고형분 30%) | 40 | 옥사졸린가교제(고형분 25%) | 2.4 | 100nm(고형분 20%) | 3.0 | 54.6 |
구분 | 수분산성 코팅 조성물 | 내용제성 | 투명도 |
실시예1 | A | ○ | 0.6 |
실시예2 | B | ◎ | 0.6 |
실시예3 | C | ◎ | 0.6 |
실시예4 | D | ◎ | 0.6 |
비교예1 | E | X | 0.5 |
비교예2 | F | △ | 0.5 |
비교예3 | G | △ | 0.6 |
Claims (11)
- 투명필름; 및상기 투명필름의 적어도 일면에 코팅층을 포함하고,상기 코팅층은 히드록시기를 포함하는 고분자 수지, 티타네이트계 가교제 및 지르코네이트계 가교제로 이루어진 그룹으로부터 선택된 적어도 하나의 가교제 및 수분산성 미립자를 포함하는 수분산성 코팅 조성물을 이용하여 형성되는 것인 광학 필름.
- 제1항에 있어서,상기 수분산성 코팅 조성물은 히드록시기를 포함하는 고분자 수지 100 중량부; 티타네이트계 가교제 및 지르코네이트계 가교제로 이루어진 그룹으로부터 선택된 적어도 하나의 가교제 0.01 내지 10 중량부; 및 수분산성 미립자 0.01 내지 20 중량부를 포함하는 광학 필름.
- 제1항에 있어서,상기 고분자 수지는 폴리우레탄, 폴리에스테르, 아크릴, 폴리우레탄아크릴레이트, 아크릴, 폴리에스테르계아크릴, 폴리에스테르계우레탄 및 이들의 혼합물로 이루어진 그룹으로부터 선택되는 것인 광학 필름.
- 제1항에 있어서,상기 고분자 수지는 카르복시기 및 술폰산염기로 이루어진 군으로부터 선택된 1종 이상의 작용기를 더 포함하는 것인 광학 필름.
- 제1항에 있어서,상기 수분산성 미립자는 실리카, 티타니아, 알루미나, 지르코니아 및 안티몬계 미립자로 이루어진 그룹으로부터 선택된 1종 이상인 광학 필름.
- 제1항에 있어서,상기 코팅층의 두께가 50nm 내지 1000nm인 광학 필름.
- 제1항에 있어서,상기 투명필름은 아크릴계 필름인 광학 필름.
- 제1항에 있어서,상기 코팅층이 형성된 투명필름의 적어도 일면에 표면코팅층을 포함하는 광학 필름.
- 편광자; 및상기 편광자의 적어도 일면에 상기 청구항 1 내지 10항 중 어느 한 항의 광학 필름을 포함하는 편광판.
Priority Applications (4)
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US15/024,676 US10416355B2 (en) | 2013-09-30 | 2014-09-23 | Optical film with excellent solvent resistance and polarizing plate comprising same |
EP14849541.9A EP3054323A4 (en) | 2013-09-30 | 2014-09-23 | Optical film with excellent solvent resistance and polarizing plate comprising same |
JP2016545681A JP6257783B2 (ja) | 2013-09-30 | 2014-09-23 | 耐溶剤性に優れた光学フィルム及びこれを含む偏光板 |
CN201480054150.9A CN105593706B (zh) | 2013-09-30 | 2014-09-23 | 具有优异的耐溶剂性的光学膜以及包含该光学膜的偏光板 |
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KR1020140124592A KR20150037541A (ko) | 2013-09-30 | 2014-09-18 | 내용제성이 우수한 광학 필름 및 이를 포함하는 편광판 |
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JP2008279736A (ja) * | 2007-05-14 | 2008-11-20 | Fujifilm Corp | 親水性部材及びその製造方法 |
JP2009204929A (ja) * | 2008-02-28 | 2009-09-10 | Konica Minolta Opto Inc | 光学フィルム、その製造方法、偏光板、及び液晶表示装置 |
KR20120030937A (ko) * | 2010-09-20 | 2012-03-29 | 주식회사 엘지화학 | 수계 프라이머 조성물, 이를 포함하는 편광판 및 프라이머층을 구비한 광학필름의 제조방법 |
KR20120030975A (ko) * | 2010-09-20 | 2012-03-29 | 주식회사 엘지화학 | 편광판용 접착제, 이를 포함하는 편광판 및 이의 제조방법 |
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JP2008279736A (ja) * | 2007-05-14 | 2008-11-20 | Fujifilm Corp | 親水性部材及びその製造方法 |
JP2009204929A (ja) * | 2008-02-28 | 2009-09-10 | Konica Minolta Opto Inc | 光学フィルム、その製造方法、偏光板、及び液晶表示装置 |
KR20120030937A (ko) * | 2010-09-20 | 2012-03-29 | 주식회사 엘지화학 | 수계 프라이머 조성물, 이를 포함하는 편광판 및 프라이머층을 구비한 광학필름의 제조방법 |
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