WO2022098183A1 - 점착 필름, 이를 포함하는 광학 부재 및 이를 포함하는 광학표시장치 - Google Patents
점착 필름, 이를 포함하는 광학 부재 및 이를 포함하는 광학표시장치 Download PDFInfo
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- WO2022098183A1 WO2022098183A1 PCT/KR2021/016105 KR2021016105W WO2022098183A1 WO 2022098183 A1 WO2022098183 A1 WO 2022098183A1 KR 2021016105 W KR2021016105 W KR 2021016105W WO 2022098183 A1 WO2022098183 A1 WO 2022098183A1
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- Prior art keywords
- adhesive film
- film
- pressure
- acrylate
- weight
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- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 claims description 3
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical group C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 claims description 3
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- 229920001490 poly(butyl methacrylate) polymer Polymers 0.000 description 1
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- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000205 poly(isobutyl methacrylate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920002776 polycyclohexyl methacrylate Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920002720 polyhexylacrylate Polymers 0.000 description 1
- 229920000129 polyhexylmethacrylate Polymers 0.000 description 1
- 229920000197 polyisopropyl acrylate Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- ZAZYDMICXIJUNB-UHFFFAOYSA-L prop-2-enoate trimethyl(2-prop-2-enoyloxyethyl)azanium chloride Chemical compound [Cl-].C(C=C)(=O)OCC[N+](C)(C)C.C(C=C)(=O)[O-].C(C=C)(=O)OCC[N+](C)(C)C ZAZYDMICXIJUNB-UHFFFAOYSA-L 0.000 description 1
- BWJUFXUULUEGMA-UHFFFAOYSA-N propan-2-yl propan-2-yloxycarbonyloxy carbonate Chemical compound CC(C)OC(=O)OOC(=O)OC(C)C BWJUFXUULUEGMA-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- YPVDWEHVCUBACK-UHFFFAOYSA-N propoxycarbonyloxy propyl carbonate Chemical compound CCCOC(=O)OOC(=O)OCCC YPVDWEHVCUBACK-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- FWFUWXVFYKCSQA-UHFFFAOYSA-M sodium;2-methyl-2-(prop-2-enoylamino)propane-1-sulfonate Chemical compound [Na+].[O-]S(=O)(=O)CC(C)(C)NC(=O)C=C FWFUWXVFYKCSQA-UHFFFAOYSA-M 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- OPQYOFWUFGEMRZ-UHFFFAOYSA-N tert-butyl 2,2-dimethylpropaneperoxoate Chemical compound CC(C)(C)OOC(=O)C(C)(C)C OPQYOFWUFGEMRZ-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- CSKKAINPUYTTRW-UHFFFAOYSA-N tetradecoxycarbonyloxy tetradecyl carbonate Chemical compound CCCCCCCCCCCCCCOC(=O)OOC(=O)OCCCCCCCCCCCCCC CSKKAINPUYTTRW-UHFFFAOYSA-N 0.000 description 1
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical class [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
-
- 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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/10—Homopolymers or copolymers of methacrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
Definitions
- the present invention relates to an adhesive film, an optical member including the same, and an optical display device including the same.
- a plurality of optical elements are stacked by an adhesive film.
- the conventional adhesive film is manufactured by coating a composition for an adhesive film on one surface of a release film, curing it, and then punching it out according to the size of the optical element.
- Adhesive films with foldable performance show a large difference in rheological properties compared to conventional adhesive films.
- the background technology of the present invention is disclosed in Korean Patent Application Laid-Open No. 2017-0070370 and the like.
- An object of the present invention is to provide an adhesive film having excellent foldability at low temperature and foldability at high temperature.
- Another object of the present invention is to provide an adhesive film having excellent bending reliability by implementing excellent foldability at low temperature and excellent foldability at high temperature even after being left for a long time at high temperature and high humidity.
- Another object of the present invention is to provide an adhesive film suitable for a foldable display device requiring water resistance due to small changes in peel strength, rheological properties and durability compared to before long-term storage at high temperature and high humidity even after being left at high temperature and high humidity for a long time. .
- Another object of the present invention is to provide an adhesive film suitable for a foldable display device that has excellent water resistance and requires water resistance.
- One aspect of the present invention is an adhesive film.
- the adhesive film is formed of a composition including a monomer mixture including a monomer having a glass transition temperature of about -50° C. or less and a (meth) acrylate having a hydroxyl group and an epoxy-based silane coupling agent, and the adhesive film is
- the rate of change of shear strain of Equation 1 is about 10% or less:
- Rate of change of shear strain [ ⁇ B - A ⁇ /A] x 100
- A is the initial shear strain value of the adhesive film (unit: %)
- B is the pressure-sensitive adhesive film obtained from the pressure-sensitive adhesive sheet after leaving the pressure-sensitive adhesive film and the release polyethylene terephthalate film laminated on both sides of the pressure-sensitive adhesive film at 60 ° C. and 95% relative humidity for 10 days and at 25 ° C. for 2 hours Shear strain value in %).
- Equation 1 A may be about 10% or more, and B may be about 10% or more.
- the adhesive film may have an initial modulus of about 0.3 MPa or less at -20°C.
- the adhesive film may have an initial modulus of about 0.05 MPa or less at 60°C.
- the adhesive film may have a peel strength change rate of Equation 2 below about 20%:
- Rate of change of peel strength [ ⁇ D - C ⁇ /C] x 100
- Equation 2 C is the initial peel strength of the adhesive film to the glass plate in a specimen in which a glass plate, an adhesive film, and a corona-treated polyethylene terephthalate film are sequentially laminated (unit: gf/25mm)
- D is the peel strength of the adhesive film to the glass plate after leaving the specimen at 60° C. and 95% relative humidity for 10 days and leaving it at 25° C. for 2 hours (unit: gf/25 mm)).
- D in Equation 2 may be greater than or equal to about 400 gf/25 mm.
- the adhesive film may have a modulus of about 0.3 MPa or less at -20°C after being left for 10 days at 60°C and 95% relative humidity.
- the adhesive film may have a change rate of the modulus of Equation 3 below about 10%:
- Rate of change of modulus [ ⁇ F - E ⁇ /E] x 100
- Equation 3 E is the initial modulus at 60° C. of the adhesive film (unit: MPa)
- F is the pressure-sensitive adhesive film on both sides of the pressure-sensitive adhesive film and the release polyethylene terephthalate film laminated on both sides of the pressure-sensitive adhesive sheet at 60 ° C and 95% relative humidity for 10 days and at 25 ° C. of modulus (unit: MPa)).
- the epoxy-based silane coupling agent may be included in an amount of about 0.2 parts by weight to about 5 parts by weight based on 100 parts by weight of the monomer mixture.
- the epoxy-based silane coupling agent is 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 3-glycidoxypropylmethyl dimethoxysilane, 3-glycidoxypropyl trimethoxysilane , 3-glycidoxypropylmethyl diethoxysilane, and 3-glycidoxypropyl triethoxysilane.
- the monomer having a glass transition temperature of about -50° C. or less of the homopolymer may have a branched chain.
- the monomer having a glass transition temperature of about -50° C. or less of the homopolymer is an unsubstituted (meth)acrylic acid ester having an alkyl group without an alkylene glycol group having 3 to 20 carbon atoms and an unsubstituted carbon number 3 to 20 as may include a mixture of (meth)acrylic acid esters having an alkyl group with an alkylene glycol group.
- the alkyl group without the alkylene glycol group and the alkyl group with the alkylene glycol group may each have a branched chain.
- the unsubstituted (meth)acrylic acid ester having an alkyl group without an alkylene glycol group having 3 to 20 carbon atoms may be included in about 50 wt% to about 80 wt% of the monomer mixture.
- the unsubstituted (meth)acrylic acid ester having an alkyl group having an alkylene glycol group having 3 to 20 carbon atoms may be included in about 10 wt% to about 40 wt% of the monomer mixture.
- the monomer having a glass transition temperature of about -50° C. or less of the homopolymer is about 50% to about 99% by weight of the monomer mixture, and the (meth)acrylate having a hydroxyl group is about It may be included in an amount of 1 wt% to about 50 wt%.
- the adhesive film may further include organic nanoparticles.
- the organic nanoparticles may be included in an amount of about 0.1 parts by weight to about 20 parts by weight based on 100 parts by weight of the monomer mixture.
- the organic nanoparticles may include core-shell type nanoparticles satisfying Equation 4:
- Tg(c) is the glass transition temperature (unit: °C) of the core
- Tg(s) is the glass transition temperature of the shell (unit: °C).
- the optical member of the present invention includes an optical film and the adhesive film of the present invention formed on at least one surface of the optical film.
- the optical display device of the present invention includes the adhesive film of the present invention.
- the present invention provides an adhesive film having excellent foldability at low temperature and foldability at high temperature.
- the present invention provides an adhesive film having excellent bending reliability by implementing excellent foldability at low temperature and excellent foldability at high temperature even after being left for a long time at high temperature and high humidity.
- the present invention provides a pressure-sensitive adhesive film suitable for a foldable display device requiring water resistance due to small changes in peel strength, rheological properties and durability compared to before long-term storage at high temperature and high humidity even after being left for a long time at high temperature and high humidity.
- the present invention provides an adhesive film suitable for a foldable display device that has excellent waterproof properties and requires waterproof properties.
- acrylic may mean acrylic and/or methacrylic.
- copolymer may include oligomers, polymers, or resins.
- the "average particle diameter" of organic nanoparticles is the particle diameter of organic nanoparticles expressed as a Z-average value measured in an aqueous or organic solvent with Malvern's Zetasizer nano-ZS equipment and a particle diameter confirmed during SEM/TEM observation. .
- modulus is the storage modulus (G').
- the term “shear strain” is a value measured at 60° C., and refers to a degree of deformation when a force in a constant shear direction is applied. Referring to FIG. 1 , when the strain applied to the pressure-sensitive adhesive film is measured under the conditions in the following Experimental Example over time with a constant force, the strain value at 600 seconds corresponds to the shear strain.
- glass transition temperature of a homopolymer may mean a glass transition temperature (Tg) measured using DSC Discovery of TA Instruments with respect to a homopolymer of a monomer to be measured. Specifically, after raising the temperature to 180 °C at a rate of 20 °C/min with respect to the homopolymer of the monomer to be measured, cooling it slowly to -100 °C, and then raising the temperature to 100 °C at a rate of 10 °C/min. After obtaining the endothermic transition curve data, the inflection point of the endothermic transition curve may be determined as the glass transition temperature.
- Tg glass transition temperature
- X to Y means X or more and Y or less (X ⁇ and ⁇ Y).
- the adhesive film of the present invention has excellent foldability at low temperature and foldability at high temperature, and exhibits excellent foldability at low temperature and excellent foldability at high temperature even after being left for a long time at high temperature and high humidity, thereby exhibiting excellent bending reliability.
- the adhesive film of the present invention has little change in peel strength, rheological properties, and durability compared to before leaving it for a long time at high temperature and high humidity even after being left for a long time at high temperature and high humidity. Accordingly, the adhesive film of the present invention has excellent waterproof properties and can be suitably used in a foldable display device requiring waterproof properties.
- the adhesive film (hereinafter, 'adhesive film') according to this embodiment is a monomer mixture containing a monomer having a glass transition temperature of about -50°C or less and a (meth)acrylate having a hydroxyl group and an epoxy-based silane coupling agent. It is formed of a composition comprising, and the pressure-sensitive adhesive film has a rate of change of shear strain of the following formula 1 of about 10% or less:
- Rate of change of shear strain [ ⁇ B - A ⁇ /A] x 100
- Equation 1 A is the initial shear strain of the adhesive film (unit: %)
- B is the pressure-sensitive adhesive film obtained from the pressure-sensitive adhesive sheet after leaving the pressure-sensitive adhesive film and the release polyethylene terephthalate film laminated on both sides of the pressure-sensitive adhesive film at 60 ° C and 95% relative humidity for 10 days and at 25 ° C for 2 hours. Shear strain value in %).
- the pressure-sensitive adhesive film has a rate of change of shear strain in Formula 1 of, for example, about 0, 0.1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10%, specifically 0% to 10%, more specifically 0% to 5%, more for example 0.1% to 4%.
- the shear strains A and B of Formula 1 are each about 10% or more, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30%, specifically 10% to 30%, more specifically 18% to 25%. In the above range, there may be an effect of securing folding reliability.
- the release polyethylene terephthalate film is a film in which a release treatment (eg, silicone treatment or fluorine treatment) is performed on a surface of the polyethylene terephthalate film in contact with the pressure-sensitive adhesive film, and may be a film having a thickness of 30 ⁇ m to 100 ⁇ m.
- a release treatment eg, silicone treatment or fluorine treatment
- the composition for forming the pressure-sensitive adhesive film includes a monomer mixture including a monomer having a glass transition temperature of about -50°C or less and (meth)acrylate having a hydroxyl group of the homopolymer.
- the pressure-sensitive adhesive film may have high initial peel strength and excellent foldability at low temperatures.
- the adhesive film has an initial peel strength of about 400 gf/25 mm or more to the glass plate, for example 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000 gf/25 mm. , specifically 400gf/25mm to 1000gf/25mm. In the above range, the adhesive film has excellent peel strength with respect to the adherend, so that the adhesive film does not peel from the adherend even in the folding process, thereby implementing excellent foldability.
- the "initial peel strength” means the peel strength measured before leaving the specimen for measuring the peel strength of the adhesive film at 60° C. and 95% relative humidity for 10 days.
- a monomer having a glass transition temperature of about -50° C. or less of the homopolymer may lower the initial modulus of the adhesive film at a low temperature so that the adhesive film has foldability at a low temperature.
- the adhesive film has an initial modulus at -20°C of about 0.3 MPa or less, for example 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3 MPa, specifically 0.01 MPa to 0.3 MPa, 0.05 MPa to 0.15 It can be MPa. In the above range, by ensuring the viscoelasticity of the pressure-sensitive adhesive film at a low temperature, it is possible to have excellent foldability at a low temperature.
- a monomer having a glass transition temperature of about -50° C. or less of the homopolymer may help to lower the initial modulus of the adhesive film at a high temperature so that the adhesive film has foldability at high temperature.
- the pressure-sensitive adhesive film may have an initial modulus of about 0.05 MPa or less at 60° C., for example, 0.01, 0.02, 0.03, 0.04, 0.05 MPa, specifically 0.01 MPa to 0.05 MPa, 0.02 MPa to 0.03 MPa. In the above range, by ensuring the viscoelasticity of the pressure-sensitive adhesive film at a high temperature, it can help to have excellent foldability and restoration properties at a high temperature.
- Monomers having a glass transition temperature of about -50°C or less of the homopolymer have an initial shear strain of about 10% or more of the adhesive film, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 , 21, 22, 23, 24, 25, 26, 27, 28, 29, 30%, for example 10% to 30%, 18% to 25%. In the above range, low-temperature folding reliability can be secured.
- a monomer having a glass transition temperature of about -50° C. or less of the homopolymer is a (meth)acrylic acid ester having a branched chain alkyl group, a branched chain alkylene group, a branched chain alkyleneoxy group, or a functional group containing them at the ester site among (meth)acrylic acid esters may include
- the branched chain alkyl group, branched chain alkylene group, or branched chain alkyleneoxy group may further lower the modulus at a low temperature of the pressure-sensitive adhesive film to improve foldability even at low temperatures.
- the branched-chain alkyl group is a branched-chain alkyl group having 3 to 20 carbon atoms, and may be, for example, an ethylhexyl group, an isooctyl group, or an isodecyl group.
- the branched chain alkylene group is a branched chain alkylene group having 3 to 20 carbon atoms, and may be an ethylhexylene group, an isooctylene group, or an isodecylene group.
- the branched chain alkylene oxy group may be a branched chain alkylene oxy group having 3 to 20 carbon atoms.
- the monomer having a glass transition temperature of about -50°C or less of the homopolymer preferably has a glass transition temperature of, for example, -100, -95, -90, -85, -80, -75, -70, -65 of the homopolymer. , -60, -55, -50°C, for example, -100°C to -50°C, more preferably -80°C to -50°C. In the above range, there may be an effect of lowering the modulus at a low temperature.
- the monomer having a glass transition ion of about -50° C. or less of the homopolymer may be included in one or more of the above monomer mixtures, that is, one or two or more.
- the monomer having a glass transition temperature of about -50°C or less of the homopolymer is about 50% to about 99% by weight of the monomer mixture, for example, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59 , 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84 , 85, 86, 87, 88, 89, 90% by weight, specifically 60% to 90% by weight, more specifically 70% to 85% by weight may be included. In the above range, there may be an effect of lowering the modulus at a low temperature to have excellent foldability at a low temperature
- the monomer having a glass transition temperature of about -50° C. or less of the homopolymer is an unsubstituted (meth)acrylic acid ester having an alkyl group having 3 to 20 carbon atoms, preferably 3 to 10 carbon atoms, without an alkylene glycol group, and It may include a mixture of (meth)acrylic acid esters having an unsubstituted alkyl group having 3 to 20 carbon atoms and preferably an alkylene glycol group having 10 to 20 carbon atoms.
- the unsubstituted (meth)acrylic acid ester having an alkyl group having no alkylene glycol group as having 3 to 20 carbon atoms may include at least one of 2-ethylhexyl (meth)acrylate, isooctyl acrylate, and isodecyl acrylate. there is.
- the alkyl group without the alkylene glycol group may have a branched chain.
- the (meth)acrylic acid ester having an alkyl group having an alkylene glycol group as unsubstituted C 3 to 20 may include a monofunctional (meth)acrylate having a plurality of alkylene glycol units.
- the alkylene glycol unit may be included in the same or heterogeneous form.
- the alkylene glycol unit may include an alkylene glycol unit having 1 to 5 carbon atoms, for example, ethylene glycol or propylene glycol.
- the alkyl group having the alkylene glycol group may have a branched chain.
- (meth)acrylic acid ester having an alkyl group having no alkylene glycol group as unsubstituted carbon number 3 to 20 is about 50% to about 80% by weight of the monomer mixture, for example 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80% by weight, specifically 50% by weight to 70% by weight may be included.
- the peel strength is high, and excellent foldability at a low temperature and excellent foldability at a high temperature can be ensured.
- (meth)acrylic acid ester having an alkyl group having an alkylene glycol group as unsubstituted carbon number 3 to 20 is about 10% to about 40% by weight of the monomer mixture, for example, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40% by weight, specifically 15% to 30% by weight may be included.
- the peel strength is high, and excellent foldability at a low temperature and excellent foldability at a high temperature can be ensured.
- a (meth)acrylate having a hydroxyl group can provide peel strength of an adhesive film.
- the (meth)acrylate having a hydroxyl group may include (meth)acrylate having 1 to 10 carbon atoms and containing at least one hydroxyl group.
- (meth)acrylate having a hydroxyl group is 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxy and at least one of propyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, and 6-hydroxyhexyl (meth)acrylate, but is not limited thereto.
- the (meth)acrylate having a hydroxyl group may be included in one or more of the above monomer mixtures, that is, one or two or more.
- the (meth)acrylate having a hydroxyl group is from about 1% to about 50% by weight of the monomer mixture, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50% by weight, specifically 10% to 40% by weight, more specifically 15% to 30% by weight can In the above range, peel strength and durability reliability of the adhesive film may be further improved.
- the monomer mixture may further include a copolymerizable monomer in addition to a monomer having a glass transition temperature of about -50° C. or less and a (meth)acrylate having a hydroxyl group of the homopolymer.
- the copolymerizable monomer may be further included in the monomer mixture to provide an additional effect to the adhesive film.
- the copolymerizable monomer is a monomer different from the above-mentioned monomers, and includes a monomer having an amine group, a monomer having an alkoxy group, a monomer having a phosphoric acid group, a monomer having a sulfonic acid group, a monomer having a phenyl group, a monomer having a silane group, a monomer having a carboxylic acid group, and At least one of amide group-containing monomers may be included.
- the monomer having an amine group is monomethylaminoethyl acrylate, monoethylaminoethyl acrylate, monomethylaminopropyl acrylate, monoethylaminopropyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, N-tert- It may be an amine group-containing acrylic monomer such as butylaminoethyl acrylate or acryloxyethyltrimethylammonium chloride acrylate, but is not limited thereto.
- Monomers having an alkoxy group include 2-methoxyethyl acrylate, 2-methoxypropyl acrylate, 2-ethoxypropyl acrylate, 2-butoxypropyl acrylate, 2-methoxypentyl acrylate, 2-ethoxypentyl acrylate, 2-butoxyhexyl acrylate, 3-methoxypentyl acrylate, 3-ethoxypentyl acrylate, 3-butoxyhexyl acrylate, but is not limited thereto.
- the monomer having a phosphoric acid group may be an acrylic monomer having a phosphoric acid group such as 2-methacryloyloxyethyldiphenyl phosphate acrylate, trimethacryloyloxyethyl phosphate acrylate, triacryloyloxyethyl phosphate acrylate, , but is not limited thereto.
- the monomer having a sulfonic acid group may be an acrylic monomer having a sulfonic acid group, such as sodium sulfopropyl acrylate, sodium 2-sulfoethyl acrylate, sodium 2-acrylamido-2-methylpropanesulfonate, but is not limited thereto. it is not
- the monomer having a phenyl group may be an acrylic vinyl monomer having a phenyl group, such as p-tert-butylphenyl acrylate, o-biphenyl acrylate, and phenoxyethyl acrylate, but is not limited thereto.
- Monomers having a silane group include 2-acetoacetoxyethyl acrylate, vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tris (2-methoxyethyl) silane, vinyl triacetoxysilane, acryloyloxypropyl trime It may be a vinyl monomer having a silane group such as oxysilane, but is not limited thereto.
- the monomer having a carboxylic acid group may be acrylic acid, 2-carboxyethyl acrylate, 3-carboxypropyl acrylate, 4-carboxybutyl acrylate, itaconic acid, crotonic acid, maleic acid, fumaric acid and maleic anhydride, but is not limited thereto. it's not going to be
- Amide group-containing monomers include acrylamide, N-methylacrylamide, N-methylolacrylamide, N-methoxymethylacrylamide, N,N-methylenebisacrylamide, N-hydroxyethylacrylamide, N,N- It may be diethylacrylamide, etc., but is not limited thereto.
- the copolymerizable monomer may be included in an amount of 30 wt% or less, preferably 0 wt% to 30 wt% of the monomer mixture. In the above range, the adhesive force with the adherend and optical properties may be adjusted.
- the epoxy-based silane coupling agent makes the value of the shear strain after leaving the pressure-sensitive adhesive film at high temperature and high humidity for a long time similar to the initial shear strain without significant change, so that the pressure-sensitive adhesive film is left at high temperature and high humidity for a long time before and after being left for a long time.
- the rate of change of the shear strain can be 10% or less.
- the adhesive film can maintain foldability at low temperature and foldability at high temperature even after leaving the adhesive film at high temperature and high humidity for a long period of time, and by lowering the rate of change in peel strength even after being left for a long time at high temperature and high humidity, the adhesive film has excellent waterproof properties can be made to indicate
- the rate of change of the shear strain of Equation 1 may be about 10% or less.
- the present inventors confirmed that the above-described effect of the present invention by including an epoxy-based silane coupling agent in the above-described monomer mixture.
- the epoxy-based silane coupling agent the amino-based silane coupling agent, the acrylic-based silane coupling agent, the (meth)acrylic-based silane coupling agent, the mercapto-based silane coupling agent, the vinyl-based silane coupling agent, and the isocyanate-based silane coupling agent are used. It was confirmed that it cannot be obtained.
- the pressure-sensitive adhesive film has a peel strength change rate of Equation 2 below about 50%, for example, 0, 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50%,
- the peel strength change rate due to long-term storage of the pressure-sensitive adhesive film under high temperature and high humidity is low, so that high temperature and high humidity It can be easy to maintain foldability even after standing:
- Rate of change of peel strength [ ⁇ D - C ⁇ /C] x 100
- Equation 2 C is the initial peel strength of the adhesive film to the glass plate in a specimen in which a glass plate, an adhesive film, and a corona-treated polyethylene terephthalate film are sequentially laminated (unit: gf/25mm)
- D is the peel strength of the adhesive film to the glass plate after leaving the specimen at 60° C. and 95% relative humidity for 10 days and leaving it at 25° C. for 2 hours (unit: gf/25 mm)).
- D may be about 400 gf/25 mm or more, for example, 400, 450, 500, 550, 600, 650, 700, 750, 800 gf/25 mm, for example, 400 gf/25 mm to 800 gf/25 mm. In the above range, the rate of change of peel strength of Equation 2 can be easily reached.
- the adhesive film has a modulus at -20°C of about 0.3 MPa or less, for example, 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3 MPa, for example, 0.01 MPa to 0.3 MPa, 0.05 MPa to 0.15 MPa.
- a modulus at -20°C of about 0.3 MPa or less, for example, 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3 MPa, for example, 0.01 MPa to 0.3 MPa, 0.05 MPa to 0.15 MPa.
- the adhesive film has a modulus at 60° C. of about 0.04 MPa or less, for example, 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, after standing at 60° C. and 95% relative humidity for 10 days.
- MPa for example 0.01 MPa to 0.035 MPa. In the above range, even after the pressure-sensitive adhesive film is left at high temperature and high humidity, there is little change compared to the initial modulus at -20°C, thereby securing viscoelasticity at high temperature of the pressure-sensitive adhesive film, thereby helping to have excellent foldability at high temperature.
- the pressure-sensitive adhesive film has a rate of change of the modulus of Formula 3 below about 10%, for example 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10%, for example It can be 0% to 10%: in the above range, the rate of change of the high-temperature modulus according to the long-term storage under high temperature and high humidity of the adhesive film is low, so that folding characteristics are good even after folding and unfolding from low to high temperature. :
- Rate of change of modulus [ ⁇ F - E ⁇ /E] x 100
- Equation 3 E is the initial modulus at 60° C. of the adhesive film (unit: MPa)
- F is the pressure-sensitive adhesive film on both sides of the pressure-sensitive adhesive film and the release polyethylene terephthalate film laminated on both sides of the pressure-sensitive adhesive sheet at 60 ° C and 95% relative humidity for 10 days and at 25 ° C. of modulus (unit: MPa).
- the release polyethylene terephthalate film is a film in which a release treatment (eg, silicone treatment or fluorine treatment) is performed on a surface of the polyethylene terephthalate film in contact with the pressure-sensitive adhesive film, and may be a film having a thickness of 30 to 100 ⁇ m.
- a release treatment eg, silicone treatment or fluorine treatment
- epoxy silane coupling agent refers to a silane coupling agent having at least one epoxy group as an alkoxysilane monomer or alkoxysilane oligomer.
- the "epoxy group” may mean an epoxycyclohexyl group including a 3,4-epoxycyclohexyl group, a glycidoxyalkyl group including a 3-glycidoxypropyl group, and the like.
- the epoxy-based silane coupling agent is 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 3-glycidoxypropylmethyl dimethoxysilane, 3-glycidoxypropyl trimethoxysilane, 3 -Glycidoxypropylmethyl diethoxysilane and 3-glycidoxypropyl triethoxysilane may include one or more.
- the epoxy-based silane coupling agent may be included in an amount of about 0.2 parts by weight or more based on 100 parts by weight of the monomer mixture. In the above range, the rate of change of Equation 1 may be reached after the pressure-sensitive adhesive film is left for a long time at high temperature and high humidity.
- the epoxy-based silane coupling agent is 0.2 parts by weight to 5 parts by weight based on 100 parts by weight of the monomer mixture, for example, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 2, 3 , 4, 5 parts by weight, for example 0.2 parts by weight to 1 parts by weight, more specifically 0.2 parts by weight to 0.6 parts by weight may be included.
- the composition may further include an initiator.
- the initiator can cure the composition to form an adhesive film, or polymerize the monomer mixture in the composition to form a partial polymer of the monomer mixture.
- the initiator may include at least one of a photopolymerization initiator and a thermal polymerization initiator.
- any photoinitiator may be used as long as it can induce a polymerization reaction of the radically polymerizable compound described below in a curing process by light irradiation or the like.
- a benzoin-based, hydroxy ketone-based, aminoketone-based or phosphine oxide-based photoinitiator may be used, and specifically, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether , benzoin n-butyl ether, benzoin isobutyl ether, 2,2-dimethoxy-2-phenylacetophenone, 2,2'-diethoxy acetophenone, 2,2'-dibutoxy acetophenone, 2-hydro acetophenone compounds such as hydroxy-2-methyl propiophenone, p-t-butyl trichloro acetophenone, p-t-butyl dichloro acetophenone, 4-chlor
- thermal polymerization initiator for example, a conventional initiator such as an azo-based compound, a peroxide-based compound, or a redox-based compound may be used.
- the azo compound include 2,2-azobis(2-methylbutyronitrile), 2,2-trilazobis(isobutyronitrile), 2,2-trilazobis(2,4-dimethyl) Valeronitrile), 2,2-Nitazobis-2-hydroxymethylpropionitrile, dimethyl-2,2-methylazobis(2-methylpropionate) and 2,2-pioazobis(4- methoxy-2,4-dimethylvaleronitrile) and the like
- the peroxide-based compound include inorganic peroxides such as potassium perlactate, ammonium persulfate or hydrogen peroxide; or diacyl peroxide, peroxydicarbonate, peroxyester, tetramethylbutylperoxyneodecanoate, bis(4-butylcyclohexyl)
- the initiator may be included in an amount of about 0.0001 parts by weight to about 5 parts by weight, specifically 0.001 parts by weight to 3 parts by weight, and more specifically 0.001 parts by weight to 1 part by weight based on 100 parts by weight of the monomer mixture. In the above range, the curing reaction may proceed completely, and a residual amount of the initiator may remain to prevent deterioration of the light transmittance of the pressure-sensitive adhesive film, and may also reduce the generation of bubbles and have excellent reactivity.
- the composition may further include a crosslinking agent.
- the crosslinking agent may increase the degree of crosslinking of the composition to increase the mechanical strength of the adhesive film.
- the crosslinking agent may include a polyfunctional (meth)acrylate that can be cured with an active energy ray.
- the crosslinking agent is 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentylglycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, Neopentyl glycol adipate di(meth)acrylate, dicyclofentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified di(meth)acrylate, di(meth) ) Acryloxyethyl isocyanurate, allylated cyclohexyl di(meth)acrylate, tricyclodecanedimethanol (meth)acrylate, dimethylol dicyclopentanedi(meth)acrylate, ethylene oxide-modified he
- the crosslinking agent is about 0.001 parts by weight to about 5 parts by weight based on 100 parts by weight of the monomer mixture, for example, 0.001, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65 , 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 2, 3, 4, 5 parts by weight, specifically 0.003 parts by weight to 3 parts by weight, specifically 0.005 parts by weight to 1 part by weight may be included. In the above range, there is an effect of excellent peel strength and reliability increase.
- the composition may further include an additive.
- the additive may include conventional additives known to those skilled in the art to be included in the composition for an adhesive film.
- the additive may include, but is not limited to, one or more of a pigment, an ultraviolet absorber, a leveling agent, and an antistatic agent.
- the adhesive film has a glass transition temperature (Tg) of about -100°C to about -10°C, for example, -100, -95, -90, -85, -80, -75, -70, -65, -60, It may be -55, -50, -45, -40, -35°C, specifically -70°C to -35°C. In the above range, there may be an effect of improving the folding reliability at a low temperature to a high temperature.
- the adhesive film may have a glass transition temperature of -70°C to -45°C. In the above range, there is an effect of improving folding reliability at a low temperature to a high temperature, and stress can be relieved even during folding in the tensile direction, so that the foldability can be excellent.
- the adhesive film may have a haze of about 2% or less, specifically 0.1% to 1%, and a total light transmittance of about 90% or more, specifically 95% to 99% in the visible region (eg, wavelength 380 nm to 780 nm). there is. In the above range, the optical transparency is good, so that it can be used in an optical display device.
- the pressure-sensitive adhesive film may have a thickness of about 10 ⁇ m to about 300 ⁇ m, specifically 12 ⁇ m to 175 ⁇ m. Within the above range, it can be used for an optical display device.
- the adhesive film is a pressure sensitive adhesive, wherein the monomer mixture is partially polymerized with an initiator, an epoxy-based silane coupling agent is included to prepare a composition, and then the composition is coated on a release film and then cured, for example It can be prepared by photocuring. Curing may include irradiation of 400 mJ/cm 2 to 3000 mJ/cm 2 of irradiation at a wavelength of 300 nm to 400 nm with a low pressure lamp in an anaerobic state. When preparing the composition, an initiator, a crosslinking agent, an additive, and the like may be further included.
- Partial polymerization may include solution polymerization, suspension polymerization, photopolymerization, bulk polymerization, or emulsion polymerization. Specifically, solution polymerization may be performed at 50 to 100° C. by adding an initiator to the monomer mixture. As the initiator, an acetophenone-based initiator including 2,2-dimethoxy-2-phenylacetophenone and the like and a photopolymerization initiator such as 1-hydroxycyclohexylphenyl ketone may be used. Partial polymerization may have a viscosity of 300 cPs to 50,000 cPs, specifically, a viscosity of 500 cPs to 9,000 cPs at 25°C.
- the adhesive film is formed of a composition including a monomer mixture comprising a monomer having a glass transition temperature of about -50° C. or less and a (meth) acrylate having a hydroxyl group, an epoxy-based silane coupling agent, and organic nanoparticles, and the adhesive The film has a rate of change of shear strain of Equation 1 of about 10% or less.
- the pressure-sensitive adhesive film is substantially the same as the pressure-sensitive adhesive film of an embodiment of the present invention, except that it further includes organic nanoparticles.
- Organic nanoparticles increase the modulus of the pressure-sensitive adhesive film at high temperatures compared to the case where organic nanoparticles are not included, so that the pressure-sensitive adhesive film does not peel and/or float and/or bubble at high temperatures, thereby increasing reliability at high temperatures.
- the organic nanoparticles have a high glass transition temperature, so it is possible to increase the modulus of the adhesive film at a high temperature.
- Organic nanoparticles are about 0.1 parts by weight to about 20 parts by weight based on 100 parts by weight of the monomer mixture, for example, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 , 12, 13, 14, 15, 16, 17, 18, 19, 20 parts by weight, specifically 0.5 parts by weight to 12 parts by weight, specifically 0.5 parts by weight to 8 parts by weight.
- the modulus of the pressure-sensitive adhesive film at high temperature may be increased, the foldability of the pressure-sensitive adhesive film at room temperature and high temperature may be improved, and the low-temperature and/or room temperature viscoelasticity of the pressure-sensitive adhesive film may be excellent.
- the organic nanoparticles may have an average particle diameter of about 10 nm to about 400 nm, specifically 10 nm to 300 nm, more specifically 30 nm to 280 nm, and more specifically 50 nm to 280 nm. In the above range, it does not affect the folding of the adhesive film, and the total light transmittance in the visible light region may be 90% or more, so that the transparency of the adhesive film may be good.
- the organic nanoparticles have a refractive index difference of about 0.1 or less with the partial (meth)acrylic polymer or (meth)acrylic polymer formed of the monomer mixture, for example, 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08 , 0.09, 0.1, specifically 0 or more and 0.05 or less, specifically 0 or more and 0.02 or less.
- the transparency of the adhesive film may be excellent.
- the organic nanoparticles may have a refractive index of about 1.35 to about 1.70, specifically 1.40 to 1.60. In the above range, the transparency of the adhesive film may be excellent.
- the organic nanoparticles may include simple nanoparticles such as a core-shell type as well as a bead type, but is not limited thereto.
- the core and the shell may satisfy Equation 4: That is, both the core and the shell may be nanoparticles of an organic material.
- Tg(c) is the glass transition temperature (unit: °C) of the core
- Tg(s) is the glass transition temperature of the shell (unit: °C).
- the term “shell” refers to the outermost layer among organic nanoparticles.
- the core may be a single spherical particle. However, if the core has the above glass transition temperature, it may further include an additional layer surrounding the spherical particles.
- the glass transition temperature of the core is about -150 ° C. to about 10 ° C.
- the core may include at least one of polyalkyl acrylate, polysiloxane, and polybutadiene having the above glass transition temperature.
- Polyalkyl acrylates include polymethyl acrylate, polyethyl acrylate, polypropyl acrylate, polybutyl acrylate, polyisopropyl acrylate, polyhexyl acrylate, polyhexyl methacrylate, polyethylhexyl acrylate and polyethyl acrylate. It may include one or more of hexyl methacrylate and polysiloxane, but is not necessarily limited thereto.
- the polysiloxane can be, for example, an organosiloxane (co)polymer.
- Non-crosslinked organosiloxane (co)polymer may be used, or crosslinked (co)polymer may be used.
- a crosslinked organosiloxane (co)polymer may be used for impact resistance and colorability.
- This is a cross-linked organosiloxane, and specifically, cross-linked dimethylsiloxane, methylphenylsiloxane, diphenylsiloxane, or a mixture of two or more thereof may be used.
- the refractive index of 1.41 to 1.50 can be controlled by using a copolymerized form of two or more organosiloxanes.
- the crosslinking state of the organosiloxane (co)polymer can be judged by the degree of dissolution by various organic solvents. The deeper the crosslinking state, the smaller the degree of dissolution by the solvent.
- Acetone or toluene may be used as a solvent for determining the crosslinking state, and specifically, the organosiloxane (co)polymer may have a portion that is not dissolved by acetone or toluene.
- the insoluble component in toluene of the organosiloxane copolymer may be 30% or more.
- the organosiloxane (co)polymer may further include an alkyl acrylate cross-linked polymer.
- the alkyl acrylate cross-linked polymer may be methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, or the like.
- n-butyl acrylate or 2-ethylhexyl acrylate having a low glass transition temperature may be used.
- the glass transition temperature of the shell is about 15 °C to about 150 °C, for example, 15, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 °C , specifically 35 °C to 150 °C, more specifically 50 °C to 140 °C.
- the dispersibility of the organic nanoparticles in the acrylic copolymer may be excellent.
- the shell may include polyalkyl methacrylate having the glass transition temperature.
- polymethyl methacrylate PMMA
- polyethyl methacrylate polypropyl methacrylate
- polybutyl methacrylate polyisopropyl methacrylate
- polyisobutyl methacrylate polycyclohexyl methacrylate.
- rate may include, but is not necessarily limited to.
- the core may be included in about 30 wt% to about 99 wt%, specifically 40 wt% to 95 wt%, and more specifically 50 wt% to 90 wt% of the organic nanoparticles.
- the foldability of the adhesive film may be good in a wide temperature range.
- the shell may be included in an amount of about 1% to about 70% by weight, specifically 5% to 60% by weight, and more specifically 10% to 50% by weight of the organic nanoparticles.
- the foldability of the pressure-sensitive adhesive film may be good in a wide temperature range.
- Organic nanoparticles are about 0.1% to about 20% by weight of the adhesive film, for example, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 , 14, 15, 16, 17, 18, 19, 20% by weight, specifically 0.5% to 12% by weight, specifically 0.5% to 8% by weight may be included.
- the modulus of the pressure-sensitive adhesive film at high temperature may be increased, the foldability of the pressure-sensitive adhesive film at room temperature and high temperature may be improved, and the low-temperature and/or room temperature viscoelasticity of the pressure-sensitive adhesive film may be excellent.
- Organic nanoparticles may be prepared by conventional emulsion polymerization, suspension polymerization, and solution polymerization methods.
- the optical member according to an embodiment of the present invention includes an optical film and an adhesive film formed on at least one surface of the optical film, and the adhesive film includes an adhesive film according to embodiments of the present invention. Accordingly, the optical member has good bending and/or good folding characteristics, so that it can be used in a flexible display device.
- the optical film provides certain optical functions among display devices, such as polarization, optical compensation, display quality improvement, and/or conductivity, and the optical film is a window film, a window, a polarizing plate, a color filter, and a retardation film.
- the manufacturing method of the optical film can be easily manufactured by a person of ordinary skill in the art to which the present invention pertains.
- a touch panel may be formed by attaching it to a window or an optical film using an adhesive film on the touch pad.
- it may be applied as an adhesive film to a conventional polarizing film as in the prior art.
- the optical film is an optically transparent optical film
- the optical member including the optical film and the pressure-sensitive adhesive film may function as a support layer of the display device.
- the display device may include a window film or the like.
- the window film may include the optical member and a window coating layer (eg, a silicone-based coating layer) formed on the optical member.
- the optical film has a total light transmittance of 90% or more in the visible light region, and includes a cellulose resin including triacetyl cellulose, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate, and the like.
- the film may be formed of at least one of polyester resin, polycarbonate resin, polyimide resin, polystyrene resin, polyacrylate resin including polymethyl methacrylate, cyclic olefin polymer resin, acrylic resin, and polyamide resin.
- the optical film may have a thickness of 10 ⁇ m to 100 ⁇ m, specifically 20 ⁇ m to 75 ⁇ m, and more specifically 30 ⁇ m to 50 ⁇ m. In the above range, it may be used as a support layer of a display device.
- the optical member may be a two-layer optical member having an optical film and an adhesive film formed on one surface of the optical film.
- the optical member may be a film laminate of three or more layers including two or more optical films, and at least two or more of the optical films are laminated by the adhesive film of the present invention.
- the optical member may be a three-layer film laminate in which the first optical film, the second optical film, and the first optical film and the second optical film are laminated by the adhesive film of the present invention.
- Each of the first optical film and the second optical film may be a film formed of at least one of a polyethylene terephthalate resin, a polycarbonate resin, a polyimide resin, a polyacrylate resin, a cyclic olefin polymer resin, and an acrylic resin.
- the first optical film and the second optical film each have a thickness of 10 ⁇ m to 100 ⁇ m, specifically 20 ⁇ m to 75 ⁇ m, more specifically 30 ⁇ m to 50 ⁇ m, and the adhesive film has a thickness of 10 ⁇ m to 100 ⁇ m. This can be In the above range, there may be an effect of maximizing impact resistance while maintaining good foldability.
- the first optical film and the second optical film may have the same or different thickness and material, respectively.
- the optical display device of the present invention includes the adhesive film of the present invention.
- the optical display device may include an organic light emitting device display device, a liquid crystal display device, and the like.
- the optical display device may include a flexible display device.
- the optical display device may include a non-flexible display device.
- organic nanoparticles were prepared.
- the core is polybutyl acrylate
- the shell is polymethyl methacrylate
- the shell is 35 wt% of the organic nanoparticles
- the core is 65 wt% of the organic nanoparticles
- the average particle diameter is 100 nm
- the refractive index is 1.48 organic nanoparticles was prepared.
- the release PET film After coating the adhesive film composition prepared above with a blade to a predetermined thickness on one side of the release PET film, the release PET film is laminated, irradiated at 1200 mJ/cm 2 with a low pressure mercury lamp at an ultraviolet wavelength for primary curing, and then metal halide By irradiating with a lamp at 2000mJ/cm 2 , secondary curing was performed to prepare an adhesive sheet, which is a laminate of PET release film-adhesive film-PET release film.
- Example 1 an adhesive sheet was prepared in the same manner as in Example 1, except that the composition of the composition for an adhesive film was changed as shown in Table 1 below.
- Example 1 an adhesive sheet was prepared in the same manner as in Example 1, except that the composition of the composition for an adhesive film was changed as shown in Table 1 below.
- the adhesive film was prepared by peeling the PET release film from the adhesive sheet prepared in Examples and Comparative Examples, and the physical properties of the adhesive film were evaluated in Table 1 below, and the results are shown in Table 1 below.
- peel strength (unit: gf/25 mm): The adhesive sheet which is a sample (length x width: 25 mm x 25 mm) was obtained from the adhesive sheet of an Example and a comparative example.
- One side of the PET film (length x width x thickness: 150mm x 25mm x 75 ⁇ m) was treated with corona twice (total Dose: 156 dose) for corona treatment.
- corona twice total Dose: 156 dose
- the prepared specimen was fixed to a peel strength measuring instrument, TA.XT - Plus Texture Analyzer (Stable Micro System (manufactured by Stable Micro System)).
- TA.XT - Plus Texture Analyzer Stable Micro System (manufactured by Stable Micro System)
- the adhesive film and PET film were pulled from the glass plate at 180 ° at a speed of 300 mm/min to measure the peel strength when the adhesive film and PET film began to peel from the glass plate. , this value was referred to as "initial peel strength".
- An adhesive sheet having a length x width (25 mm x 25 mm) was obtained from the adhesive sheets of Examples and Comparative Examples.
- a specimen was prepared as described above, the specimen was left in a chamber at 60° C. and 95% relative humidity for 10 days, then taken out, and the specimen was placed at 25° C. for 2 hours. Then, peel strength was measured in the same manner as in the initial peel strength measurement. was measured, and this value was referred to as "peel strength after high temperature, high humidity".
- Modulus (unit: MPa): a plurality of adhesive films prepared in Examples and Comparative Examples were laminated to prepare a sample having a thickness of 500 ⁇ m.
- the adhesive film sample was used as a specimen by punching the laminate with a perforator having a diameter of 8 mm.
- TA rheometer
- a dynamic viscoelasticity measuring device 1% strain, modulus at 1Hz in temperature sweep test mode at a temperature increase rate of 5°C/min in a temperature range of -50°C to 100°C was measured.
- the modulus was obtained at -20°C and 60°C, respectively, and this value was referred to as the “initial modulus”.
- the pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples were left in a chamber at 60° C. and 95% relative humidity for 10 days, then taken out and then placed at 25° C. for 2 hours. . Then, after obtaining an adhesive film, the modulus was measured in the same manner as the initial modulus measurement, and this value was referred to as "modulus after high temperature, high humidity".
- the upper and lower surfaces of the prepared cylindrical specimen were respectively fitted to the upper and lower jigs of a dynamic viscoelasticity measuring device rheometer (TA, DHR3).
- the chamber temperature was set to 60°C
- the axial force 1N was fitted to the upper and lower jigs of a dynamic viscoelasticity measuring device rheometer (TA, DHR3).
- the chamber temperature was set to 60°C
- the axial force 1N was 2000Pa
- the time was designated as 600 seconds.
- the pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples were left in a chamber at 60° C. and 95% relative humidity for 10 days, then taken out and placed at 25° C. for 2 hours. Then, after obtaining an adhesive film, the shear strain was measured in the same manner as the initial shear strain measurement, and this value was referred to as "shear strain rate after high temperature, high humidity". Equation 1 was used to calculate the rate of change.
- a module specimen laminated in the order of a window film, an adhesive film, a polarizer, an adhesive film, and an OLED panel was prepared.
- the following window film, adhesive film, polarizer, adhesive film, and OLED panel were used in manufacturing the module:
- PET film (thickness: 100 ⁇ m, Cosmoshine TA015, Toyobo) was replaced.
- Adhesive film The adhesive films prepared in Examples and Comparative Examples were used.
- PVA resin dyed with iodine was used.
- a polyvinyl alcohol film having a thickness of 80 ⁇ m (saponification degree: 99.5, polymerization degree: 2000) was immersed in 0.3% aqueous iodine solution for dyeing, followed by MD stretching so as to obtain a draw ratio of 5.0. Then, the stretched polyvinyl alcohol film was immersed in 3% boric acid solution and 2% potassium iodide aqueous solution for color correction, and then dried at 50° C. for 4 minutes to prepare a polarizer (thickness 25 ⁇ m).
- PET film thickness: 100 ⁇ m, Cosmoshine TA015, Toyobo was replaced.
- Flexural reliability 2 (@60° C.): A module specimen was manufactured in the same manner as in (4). After standing for 10 days in a chamber at 60°C and 95% relative humidity, the bending reliability was evaluated at 60°C in the same manner as in (4).
- the pressure-sensitive adhesive film of the present invention has Equation 1 of 10% or less, and even after being left for a long time at high temperature and high humidity, the change in rheological properties is low compared to before leaving it for a long time at high temperature and high humidity. Since the values of Equations 2 and 3 satisfy the ranges of the present application, respectively, foldability at low temperature and foldability at high temperature may be excellent.
- the comparative example that does not satisfy the present invention cannot have foldability at low temperature and foldability at high temperature, and even after being left for a long time at high temperature and high humidity in Eq. It cannot be used for foldable displays that require water resistance due to the high change in rheological properties compared to before leaving it unattended.
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Abstract
Description
실시예 | 비교예 | |||||||||
1 | 2 | 3 | 4 | 5 | 1 | 2 | 3 | 4 | ||
단량체 | 단량체 1 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 | 59 |
단량체 2 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | |
단량체 3 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | |
유기 나노 입자 | 3 | 3 | 3 | 0 | 3 | 3 | 3 | 3 | 3 | |
Omnirad 127 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
Omnirad 651 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | 0.1 | |
DPHA | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | 0.035 | |
실란 커플링제 종류 | SC 1 | SC 1 | SC 1 | SC 1 | SC 1 | SC 2 | SC 3 | SC 4 | - | |
실란 커 플링제 함량 | 0.2 | 0.2 | 0.6 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0 | |
두께(㎛) | 50 | 35 | 35 | 35 | 25 | 35 | 35 | 35 | 35 | |
박리 강도 | 초기 | 612 | 572 | 598 | 581 | 569 | 571 | 604 | 587 | 606 |
고온 고습 후 | 589 | 547 | 586 | 569 | 536 | 113 | 122 | 235 | 215 | |
식 2의 변화율 | 3.76 | 4.37 | 2.01 | 2.07 | 5.80 | 80.21 | 79.80 | 59.97 | 64.52 | |
모듈러스 (@-20℃) |
초기 | 0.086 | 0.085 | 0.089 | 0.088 | 0.086 | 0.099 | 0.092 | 0.096 | 0.094 |
고온 고습 후 | 0.087 | 0.088 | 0.087 | 0.087 | 0.084 | 0.100 | 0.093 | 0.093 | 0.096 | |
모듈러스 (@60℃) |
초기 | 0.027 | 0.023 | 0.024 | 0.023 | 0.024 | 0.027 | 0.023 | 0.026 | 0.024 |
고온 고습 후 | 0.026 | 0.025 | 0.026 | 0.024 | 0.024 | 0.042 | 0.039 | 0.040 | 0.027 | |
식 3의 변화율 | 3.70 | 8.70 | 8.33 | 4.35 | 0 | 55.55 | 69.57 | 53.85 | 12.5 | |
전단 변형율 | 초기 | 18.8 | 20.8 | 19.5 | 20.1 | 18.9 | 22.7 | 21.1 | 20.6 | 18.3 |
고온 고습 후 | 18.3 | 20.9 | 18.9 | 20.5 | 18.7 | 8.1 | 8.2 | 8.3 | 15.2 | |
식 1의 변화율 | 2.66 | 0.48 | 3.07 | 1.99 | 1.06 | 64.32 | 61.14 | 59.71 | 16.94 | |
굴곡 신뢰성 1 (@-20℃) |
OK | OK | OK | OK | OK | OK | OK | OK | OK | |
굴곡 신뢰성 2 (@60℃) |
OK | OK | OK | OK | OK | NG | NG | NG | NG |
Claims (21)
- 호모폴리머의 유리전이온도가 약 -50℃ 이하인 단량체 및 수산기를 갖는 (메트)아크릴레이트를 포함하는 단량체 혼합물 및 에폭시계 실란커플링제를 포함하는 조성물로 형성되는 점착 필름이고,상기 점착 필름은 하기 식 1의 전단 변형율의 변화율이 약 10% 이하인 것인, 점착 필름:[식 1]전단 변형율의 변화율 = [│B - A│/A] x 100(상기 식 1에서, A는 점착 필름의 초기 전단 변형율(단위:%)B는 점착 필름 및 점착 필름의 양면에 이형 폴리에틸렌테레프탈레이트 필름이 적층된 점착 시트를 60℃ 및 95% 상대 습도 내에서 10일 동안 방치하고 25℃에서 2시간 방치한 후의 상기 점착 시트로부터 얻은 점착 필름의 전단 변형율 값(단위:%)).
- 제1항에 있어서, 상기 식 1에서 A는 약 10% 이상이고, B는 약 10% 이상인 것인, 점착 필름.
- 제1항에 있어서, 상기 점착 필름은 -20℃에서 초기 모듈러스가 약 0.3MPa 이하인 것인, 점착 필름.
- 제1항에 있어서, 상기 점착 필름은 60℃에서 초기 모듈러스가 약 0.05MPa 이하인 것인, 점착 필름.
- 제1항에 있어서, 상기 점착 필름은 하기 식 2의 박리 강도 변화율이 약 20% 이하인 것인, 점착 필름:[식 2]박리 강도의 변화율 = [│D - C│/C] x 100(상기 식 2에서, C는 유리판, 점착 필름, 및 코로나 처리된 폴리에틸렌테레프탈레이트 필름이 순차적으로 적층된 시편에서 상기 점착 필름의 상기 유리판에 대한 초기 박리 강도(단위:gf/25mm)D는 상기 시편을 60℃ 및 95% 상대 습도 내에서 10일 동안 방치하고 25℃에서 2시간 방치한 후의 상기 점착 필름의 상기 유리판에 대한 박리 강도(단위:gf/25mm)).
- 제5항에 있어서, 상기 식 2에서 D는 약 400gf/25mm 이상인 것인, 점착 필름.
- 제1항에 있어서, 상기 점착 필름은 60℃ 및 95% 상대 습도 내에서 10일 동안 방치한 후의 -20℃에서의 모듈러스가 약 0.3MPa 이하인 것인, 점착 필름.
- 제1항에 있어서, 점착 필름은 하기 식 3의 모듈러스의 변화율이 약 10% 이하인 것인, 점착 필름:[식 3]모듈러스의 변화율 = [│F - E│/E] x 100(상기 식 3에서, E는 점착 필름의 60℃에서의 초기 모듈러스(단위:MPa)F는 점착 필름 및 점착 필름의 양면에 이형 폴리에틸렌테레프탈레이트 필름이 적층된 점착 시트를 60℃ 및 95% 상대 습도 내에서 10일 동안 방치하고 25℃에서 2시간 방치한 후의 상기 점착 필름의 60℃에서의 모듈러스(단위:MPa)).
- 제1항에 있어서, 상기 에폭시계 실란 커플링제는 상기 단량체 혼합물 100중량부에 대해 약 0.2중량부 내지 약 5중량부로 포함되는 것인, 점착 필름.
- 제1항에 있어서, 상기 에폭시계 실란 커플링제는 2-(3,4-에폭시시클로헥실)에틸 트리메톡시실란, 3-글리시독시프로필메틸 디메톡시실란, 3-글리시독시프로필 트리메톡시실란, 3-글리시독시프로필메틸 디에톡시실란, 3-글리시독시프로필 트리에톡시실란 중 1종 이상을 포함하는 것인, 점착 필름.
- 제1항에 있어서, 상기 호모폴리머의 유리전이온도가 약 -50℃ 이하인 단량체는 분기쇄를 갖는 것인, 점착 필름.
- 제1항에 있어서, 상기 호모폴리머의 유리전이온도가 약 -50℃ 이하인 단량체는 비치환된 탄소 수 3 내지 20으로서 알킬렌 글리콜기가 없는 알킬기를 갖는 (메트)아크릴산 에스테르 및 비치환된 탄소 수 3 내지 20으로서 알킬렌 글리콜기가 있는 알킬기를 갖는 (메트)아크릴산 에스테르의 혼합물을 포함하는 것인, 점착 필름.
- 제12항에 있어서, 상기 알킬렌 글리콜기가 없는 알킬기 및 상기 알킬렌 글리콜기가 있는 알킬기는 각각 분기쇄를 갖는 것인, 점착 필름.
- 제12항에 있어서, 상기 비치환된 탄소 수 3 내지 20으로서 알킬렌 글리콜기가 없는 알킬기를 갖는 (메트)아크릴산 에스테르는 상기 단량체 혼합물 중 약 50중량% 내지 약 80중량%로 포함되는 것인, 점착 필름.
- 제12항에 있어서, 상기 비치환된 탄소 수 3 내지 20으로서 알킬렌 글리콜기가 있는 알킬기를 갖는 (메트)아크릴산 에스테르는 상기 단량체 혼합물 중 약 10중량% 내지 약 40중량%로 포함되는 것인, 점착 필름.
- 제1항에 있어서, 상기 단량체 혼합물 중,상기 호모폴리머의 유리전이온도가 약 -50℃ 이하인 단량체는 상기 단량체 혼합물 중 약 50중량% 내지 약 99중량%, 상기 수산기를 갖는 (메트)아크릴레이트는 약 1중량% 내지 약 50중량%로 포함되는 것인, 점착 필름.
- 제1항에 있어서, 상기 점착 필름은 유기 나노 입자를 더 포함하는 것인, 점착 필름.
- 제17항에 있어서, 상기 유기 나노 입자는 상기 단량체 혼합물 100중량부 대비 약 0.1중량부 내지 약 20중량부로 포함되는 것인, 점착 필름.
- 제17항에 있어서, 상기 유기 나노 입자는 하기 식 4를 만족하는 코어-쉘 형 나노 입자를 포함하는 것인, 점착 필름:[식 4]Tg(c) < Tg(s)(상기 식 4에서, Tg(c)는 코어의 유리전이온도(단위:℃)이고,Tg(s)는 쉘의 유리전이온도(단위:℃)이다).
- 광학 필름, 및 상기 광학 필름의 적어도 일면에 형성된 점착 필름을 포함하고, 상기 점착 필름은 제1항 내지 제19항 중 어느 한 항의 점착 필름을 포함하는 것인, 광학 부재.
- 제20항의 광학 부재를 포함하는 것인, 광학표시장치.
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JP2023527447A JP2023548398A (ja) | 2020-11-09 | 2021-11-08 | 粘着フィルム、これを含む光学部材及びこれを含む光学表示装置 |
US18/252,337 US20230407141A1 (en) | 2020-11-09 | 2021-11-08 | Adhesive film, optical member comprising same, and optical display device comprising same |
EP21889648.8A EP4242278A1 (en) | 2020-11-09 | 2021-11-08 | Adhesive film, optical member comprising same, and optical display device comprising same |
CN202180089911.4A CN116724095A (zh) | 2020-11-09 | 2021-11-08 | 粘合剂膜、包括其的光学构件以及包括其的光学显示装置 |
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KR101943348B1 (ko) * | 2016-06-16 | 2019-04-17 | 후지모리 고교 가부시키가이샤 | 점착제 조성물 및 대전 방지 표면 보호 필름 |
KR20200040627A (ko) * | 2018-10-10 | 2020-04-20 | 삼성에스디아이 주식회사 | 다공성 점착 필름, 이를 포함하는 광학 부재 및 이를 포함하는 광학표시장치 |
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