Curable composition, protective film, optical element, and liquid crystal display device

Abstract

The present application aims to provide a curable composition that forms a cured product having appropriate demolding strength and residual adhesion rate, and cures a pressure-sensitive adhesive composition that forms a pressure-sensitive adhesive layer without a curing process using heat or energy rays.

Description

【Technical Field】 【0001】 The present application relates to a curable composition, a protective film, an optical element, and a liquid crystal display device. 【Background Art】 【0002】 In the manufacturing process of optical materials such as polarizing plates and retardation plates, which are materials constituting liquid crystal displays, a surface protection film for protecting the surface of the optical material is bonded. The surface protection film is used only in the process of manufacturing the optical material, and is peeled off and removed from the optical material when the optical material is attached to the liquid crystal display. 【0003】 Generally, the surface protection film has a form in which an adhesive layer is formed on one surface of a polyalkylene terephthalate resin film having optical transparency, and a release film is bonded on the adhesive layer to protect the adhesive layer. As an example of such a surface protection film, Patent Document 1 (Korean Published Patent Gazette No. 10-2016-0143501) is known. 【0004】 As described above, the release film is generally used as an application such as a coating substrate while protecting the adhesive layer. 【0005】 On the other hand, the adhesive layer of the surface protection film is generally manufactured from an acrylic composition containing an acrylic compound, and contains a compound that causes a curing reaction in the acrylic composition by heat or energy rays, and the acrylic composition is cured by appropriate heat or energy ray irradiation according to conditions. 【Prior Art Documents】 【Patent Documents】 【0006】 【Patent Document 1】 Korean Published Patent Gazette No. 10-2016-0105354 【Summary of the Invention】 [Problems that the invention aims to solve] 【0007】 The purpose of this application is to provide a curable composition that can form a cured product having appropriate release strength and residual adhesion. 【0008】 Furthermore, this application aims to provide a curable composition that allows an acrylic composition forming an adhesive layer to be cured without a curing process using heat or energy rays. [Means for solving the problem] 【0009】 In this application, if the measurement temperature affects the physical properties mentioned, unless otherwise specified, those properties are those measured at room temperature. Furthermore, unless otherwise specified, the unit of temperature is Celsius (°C). 【0010】 As used in this application, room temperature means a natural temperature that is neither heated nor cooled, and may mean any temperature within the range of 10°C to 30°C, for example, a temperature of about 15°C or higher, about 18°C ​​or higher, about 20°C or higher, about 23°C or higher, about 27°C or lower, or 25°C. 【0011】 In this application, the terms a to b refer to a range between a and b, including both a and b. For example, "including a to b parts by weight" is the same as "including within the range of a to b parts by weight." 【0012】 As used in this application, relative humidity is the ratio (%) of the amount of water vapor contained in a unit volume of air to the saturated water vapor pressure that a unit volume of air can most easily contain, and can be expressed as RH%. 【0013】 The term weight-average molecular weight (M) used in this application w ) and number-average molecular weight (M n) may be measured using GPC (Gel permeation chromatography), specifically, it may be measured by the following physical property measurement method. Also, the polydispersity index (PDI) of the terms used in this application is 、 weight average molecular weight (M w ) divided by the number average molecular weight (M n ), and the value (M w / M n ) represents the molecular weight distribution of the polymer. Specifically, the number average molecular weight (M n ) and the weight average molecular weight (M w ) are obtained by placing the analysis target in a 20 mL vial, diluting it with a THF (tetrahydrofuran) solvent to a concentration of about 20 mg / mL, filtering the calibration standard sample and the sample to be analyzed through a syringe filter (pore size: 0.2 μm), and then measuring. Also, the analysis program may use the ChemStation of Agilent technologies. By comparing the elution time of the sample with the calibration curve, the number average molecular weight (M n ) and the weight average molecular weight (M w ) can be determined. Here, the polydispersity index (PDI) may be the value obtained by dividing the measured weight average molecular weight (M w ) by the number average molecular weight (M n ). 【0014】 <GPC measurement conditions> Equipment: 1200 series of Agilent technologies Column: Use TL Mix.A&B of Agilent technologies Solvent: THF Column temperature: 40 °C Sample concentration: 20 mg / mL, 10 μl injection Use MP: 364000, 91450, 17970, 4910, 1300 as standard samples 【0015】 As used in this application, substitution means that a hydrogen atom bonded to a carbon atom of a compound is replaced by another substituent. The position of substitution is not particularly limited as long as it is a position where a hydrogen atom can be substituted, i.e., a position where a substituent can be substituted. If two or more substituents are substituted, the substituents may be the same or different from each other. 【0016】 As used in this application, the term "substituent" means an atom or group of atoms that replaces one or more hydrogen atoms in the parent chain of a hydrocarbon. Substituents are, but are not limited to, those described below, and unless otherwise specified in this application, such substituents may be further substituted with the substituents described below, or may not be substituted with any substituent at all. 【0017】 As used in this application, the terms alkyl group or alkylene group refer to linear or branched alkyl or alkylene groups having 1 to 20 carbon atoms, 1 to 16 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 6 carbon atoms, unless otherwise specified. They may also refer to cyclic alkyl or alkylene groups having 3 to 20 carbon atoms, 3 to 16 carbon atoms, 3 to 12 carbon atoms, 3 to 8 carbon atoms, or 3 to 6 carbon atoms. Here, cyclic alkyl or alkylene groups include alkyl or alkylene groups having only a ring structure and alkyl or alkylene groups containing a ring structure. For example, both cyclohexyl and methylcyclohexyl groups are cyclic alkyl groups. Furthermore, for example, alkyl or alkylene groups include, specifically, methyl(len), ethyl(len), n-propyl(len), isopropyl(len), n-butyl(len), isobutyl(len), tert-butyl(len), sec-butyl(len), 1-methyl-butyl(len), 1-ethyl-butyl(len), n-pentyl(len), isopentyl(len), neopentyl(len), tert-pentyl(len), n-hexyl(len), 1-methylpentyl(len), 2-methylpentyl(len), 4-methyl-2-pentyl(len), 3,3-dimethyl Examples include, but are not limited to, butyl(len), 2-ethylbutyl(len), n-heptyl(len), 1-methylhexyl(len), n-octyl(len), tert-octyl(len), 1-methylheptyl(len), 2-ethylhexyl(len), 2-propylpentyl(len), n-nonyl(len), 2,2-dimethylheptyl(len), 1-ethylpropyl(len), 1,1-dimethylpropyl(len), isohexyl(len), 2-methylpentyl(len), 4-methylhexyl(len), and 5-methylhexyl(len).Furthermore, specific examples of cycloalkyl or cycloalkylene groups include, but are not limited to, cyclopropyl(len), cyclobutyl(len), cyclopentyl(len), 3-methylcyclopentyl(len), 2,3-dimethylcyclopentyl(len), cyclohexyl(len), 3-methylcyclohexyl(len), 4-methylcyclohexyl(len), 2,3-dimethylcyclohexyl(len), 3,4,5-trimethylcyclohexyl(len), 4-tert-butylcyclohexyl(len), cycloheptyl(len), and cyclooctyl(len). 【0018】 As used herein, the terms alkenyl group or alkenylene group may refer to a linear or branched acyclic alkenyl or alkenylene group having 2 to 20 carbon atoms, or 2 to 16 carbon atoms, or 2 to 12 carbon atoms, or 2 to 8 carbon atoms, or 2 to 6 carbon atoms, unless otherwise specified. Here, if an alkenyl or alkenylene group with a cyclic structure is included, it corresponds to a cyclic alkenyl or alkenylene group. Also, for example, etenyl(len), n-propenyl(len), isoprofen(len), n-butenyl(len), isobutenyl(len), tert-butenyl(len), sec-butenyl(len), 1-methyl-butenyl(len), 1-ethyl-butenyl(len), n-pentenyl(len), isopentenyl(len), neopentenyl(len), tert-pentenyl(len), n-hexenyl(len), 1-methylpentenyl(len), 2-methylpentenyl(len), 4-methyl-2-pentenyl(len), 3,3-dimethylbutenyl(len), 2-ethylbutenyl Examples include, but are not limited to, tenyl(len), n-heptenyl(len), 1-methylhexenyl(len), n-octenyl(len), tert-octenyl(len), 1-methylheptenyl(len), 2-ethylhexenyl(len), 2-propylpentenyl(len), n-nonylenenyl(len), 2,2-dimethylheptenyl(len), 1-ethylprofenyl(len), 1,1-dimethylprofenyl(len), isohexenyl(len), 2-methylpentenyl(len), 4-methylhexenyl(len), and 5-methylhexenyl(len).Furthermore, cycloalkenyl or cycloalkenylene groups include, but are not limited to, cycloprofenyl(len), cyclobutenyl(len), cyclopentenyl(len), 3-methylcyclopentenyl(len), 2,3-dimethylcyclopentenyl(len), cyclohexenyl(len), 3-methylcyclohexenyl(len), 4-methylcyclohexenyl(len), 2,3-dimethylcyclohexenyl(len), 3,4,5-trimethylcyclohexenyl(len), 4-tert-butylcyclohexenyl(len), cycloheptenyl(len), and cyclooctenyl(len). 【0019】 As used herein, the terms alkynyl group or alkynylene group may, unless otherwise specified, be a linear or branched acyclic alkynyl or alkynylene group having 2 to 20 carbon atoms, or 2 to 16 carbon atoms, or 2 to 12 carbon atoms, or 2 to 8 carbon atoms, or a cyclic alkynyl or alkynylene group having 3 to 20 carbon atoms, or 3 to 16 carbon atoms, or 3 to 12 carbon atoms, or 3 to 8 carbon atoms, or 3 to 6 carbon atoms. Here, if an alkynyl or alkynylene group with a cyclic structure is included, it corresponds to a cyclic alkynyl or alkynylene group. Also, for example, ethinyl(len), n-profinyl(len), isoprofinyl(len), n-butynyl(len), isobutynyl(len), tert-butynyl(len), sec-butynyl(len), 1-methyl-butynyl(len), 1-ethyl-butynyl(len), n-pentynyl(len), isopentinyl(len), neopentynyl(len), tert-pentynyl(len), n-hexynyl(len), 1-methylpentynyl(len), 2-methylpentynyl(len), 4-methyl-2-pentynyl(len), 3,3-dimethylbutynyl(len), 2-ethyl Examples include, but are not limited to, but but include butynyl(len), n-heptynyl(len), 1-methylhexynyl(len), n-octinyl(len), tert-octinyl(len), 1-methylheptynyl(len), 2-ethylhexynyl(len), 2-propylpentinyl(len), n-noninyl(len), 2,2-dimethylheptynyl(len), 1-ethylprofinyl(len), 1,1-dimethylprofinyl(len), isohexynyl(len), 2-methylpentinyl(len), 4-methylhexynyl(len), and 5-methylhexynyl(len).Furthermore, specific examples of cycloalkynyl or cycloalkynylene groups include, but are not limited to, cycloprofinyl(len), cyclobutynyl(len), cyclopentynyl(len), 3-methylcyclopentynyl(len), 2,3-dimethylcyclopentynyl(len), cyclohexynyl(len), 3-methylcyclohexynyl(len), 4-methylcyclohexynyl(len), 2,3-dimethylcyclohexynyl(len), 3,4,5-trimethylcyclohexynyl(len), 4-tert-butylcyclohexynyl(len), cycloheptynyl(len), and cyclooctinyl(len). 【0020】 The alkyl group, alkylene group, alkenyl group, alkenylene group, alkynyl group, and alkynylene group may be optionally substituted with one or more substituents. In this case, the substituent may be at least one selected from the group consisting of halogens (chlorin (Cl), iodin (I), bromine (Br), fluorin (F)), aryl groups, heteroaryl groups, epoxy groups, alkoxy groups, cyano groups, carboxyl groups, acryloyl groups, methacryloyl groups, acryloyloxy groups, methacryloyloxy groups, carbonyl groups, and hydroxyl groups, but is not limited thereto. 【0021】 As used in this application, the term "aryl group" refers to an aromatic hydrocarbon ring from which one hydrogen atom has been removed, and the aromatic hydrocarbon ring may include monocyclic or polycyclic rings. The number of carbon atoms in the aryl group is not particularly limited, but unless otherwise specified, it may be an aryl group having 6 to 30 carbon atoms, 6 to 26 carbon atoms, 6 to 22 carbon atoms, 6 to 20 carbon atoms, 6 to 18 carbon atoms, or 6 to 15 carbon atoms. Furthermore, as used in this application, the term "arylene group" refers to an aryl group having two bonding positions, i.e., a divalent group. The above description of the aryl group may be applied to these, except that they are each divalent groups. Examples of the aryl group include, but are not limited to, a phenyl group, a phenylethyl group, a phenylpropyl group, a benzyl group, a tolyl group, a xylyl group, or a naphthyl group. 【0022】 As used in this application, the term "heteroaryl group" refers to an aromatic ring containing at least one non-carbon atom. Specifically, the non-carbon atom may include one or more atoms selected from the group consisting of nitrogen (N), oxygen (O), sulfur (S), selenium (Se), and telenium (Te). In this case, the atoms constituting the ring structure of the heteroaryl group are sometimes called "recycled atoms." Furthermore, the heteroaryl group may include monocyclic or polycyclic rings. The heteroaryl group does not particularly limit the number of carbon atoms, but unless otherwise specified, it may be a heteroaryl group having 2 to 30 carbon atoms, or 2 to 26 carbon atoms, or 2 to 22 carbon atoms, or 2 to 20 carbon atoms, or 2 to 18 carbon atoms, or 2 to 15 carbon atoms. In other examples, the heteroaryl group does not particularly limit the number of recycled atoms, but it may be a heteroaryl group having 5 to 30, 5 to 25, 5 to 20, 5 to 15, 5 to 10, or 5 to 8 recycled atoms. The heteroaryl group is, for example, a thiophene group, a furan group, a pyrrole group, an imidazolyl group, a thiazolyl group, an oxazolyl group, an oxadiazolyl group, a triazolyl group, a pyridyl group, a bipyridyl group, a pyrimidyl group, a triazinyl group, an acridyl group, a pyridadinyl group, a pyrazinyl group, a quinolinyl group, a quinoxalinyl group, a phthalazinyl group, a pyridopyrimidinyl group, a pyridopyramidinyl group, a pyrazinopyramidinyl group, an isoquinolinyl group, an indole group, a carbazolyl group, a benzoxazolyl group, a benzimidazolyl group, a benzothiazolyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a benzothiophene group, a dibenzothiophene group, a benzofuran group, a dibenzofuran group, a benzosilol group, a dibenzosilol group, or a phenanthrolinyl group. Examples include, but are not limited to, isoxazolyl groups, thiadiazolyl groups, phenothiazinyl groups, phenoxazine groups, and condensed structures thereof. 【0023】 Furthermore, the term "heteroarylene group" as used in this application refers to a heteroaryl group with two bonding positions, i.e., a divalent group. The description of heteroaryl groups described above may apply to these, except that they are each divalent groups. 【0024】 The aryl group or heteroaryl group may be optionally substituted with one or more substituents. In this case, the substituent may be at least one selected from the group consisting of halogens (chlorin (Cl), iodin (I), bromine (Br), fluorin (F)), aryl groups, heteroaryl groups, epoxy groups, alkoxy groups, cyano groups, carboxyl groups, acryloyl groups, methacryloyl groups, acryloyloxy groups, methacryloyloxy groups, carbonyl groups, and hydroxyl groups, but is not limited thereto. 【0025】 A curable composition according to one example of this application may also contain a polyorganosiloxane component and a redox catalyst. 【0026】 The term "curable composition" as used in this application may include not only components that can be converted into a resin through curing or polymerization reactions, but also components generally known as resins. Furthermore, the curable composition may have adhesive or tackiness properties on its own, or it may acquire adhesive or tackiness properties through reactions such as curing reactions. 【0027】 Furthermore, the curable composition may be a solvent-based curable composition, an aqueous curable composition, or a solvent-free curable composition. 【0028】 Furthermore, the curable composition may be of the active energy ray (e.g., ultraviolet light) curing type, moisture curing type, thermosetting type, or room temperature curing type. If the curable composition is of the active energy ray curing type, curing of the curable composition is carried out by irradiation with active energy rays such as ultraviolet light; if it is of the moisture curing type, curing of the curable composition is carried out by holding it under appropriate humidity; if it is of the thermosetting type, curing of the curable composition is carried out by applying appropriate heat; or if it is of the room temperature curing type, curing of the curable composition may be carried out by holding the curable composition at room temperature. 【0029】 A curable composition according to one example of this application can cure an acrylic composition. Furthermore, the curable composition can cure the acrylic composition and form a cured product without irradiation with heat or energy rays. 【0030】 As used in this application, the term "acrylic composition" may mean a composition containing an acrylic compound in an amount of 55% or more by weight, 55% or more by weight, 65% or more by weight, 75% or more by weight, 85% or more by weight, 95% or more by weight, or 99% or more by weight, or 100% by weight. 【0031】 Furthermore, the term "acrylic compound" (or "(meth)acrylate" as used in this application includes "acrylate" and "methacrylate," and specifically means acrylic acid, methacrylic acid, derivatives of acrylic acid, or derivatives of methacrylic acid. 【0032】 As used in this application, the term acrylic compound (or (meth)acrylate) can be represented by the compound shown in the following chemical formula A. 【0033】 [Chemical formula A] [ka] 【0034】 In the chemical formula A, R1 may be hydrogen or an alkyl group having 1 to 20 carbon atoms. R2 may be hydrogen or a halogen (fluoro(F), chloro(Cl), iodin(I), bromo(Br)), an alkyl group substituted or unsubstituted for the aforementioned substituent, an alkenyl group substituted or unsubstituted for the aforementioned substituent, an alkynyl group substituted or unsubstituted for the aforementioned substituent, an aryl group substituted or unsubstituted for the aforementioned substituent, a heteroaryl group or a hydroxyl group substituted or unsubstituted for the aforementioned substituent. 【0035】 In chemical formula A, if R1 is hydrogen and R2 is hydrogen, it is acrylic acid; if R1 is a methyl group and R2 is hydrogen, it is methacrylic acid. 【0036】 Furthermore, in chemical formula A, if R1 is hydrogen and R2 is not hydrogen, it is an acrylic acid derivative, and if R1 is a methyl group and R2 is not hydrogen, it is a methacrylic acid derivative. 【0037】 Examples of compounds with chemical formula A include (meth)acrylic acid, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate, lauryl (meth)acrylate, stearyl (meth)acrylate, cyclohexyl (meth)acrylate, dicyclopentanyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate and alkyl (meth)acrylate including stearyl (meth)acrylate, phenyl (meth)acrylate, 3-phenoxypropyl (meth)acrylate and aryl (meth)acrylate including nonylphenol ethylene oxide modified (meth)acrylate, methoxymethyl (meth)acrylate, ethoxymethyl (meth)acrylate, proproxime Ether-based (meth)acrylates including ethyl (meth)acrylate, butoxymethyl (meth)acrylate, isobutoxymethyl (meth)acrylate, methoxyethyl (meth)acrylate, ethoxyethyl (meth)acrylate, oxylanyl (meth)acrylate, oxetanyl (meth)acrylate, tetrahydrofuranyl (meth)acrylate, tetrahydro-2H-pyranyl (meth)acrylate, oxylanylmethyl (meth)acrylate (or glycidyl (meth)acrylate), oxetanylethyl (meth)acrylate, tetrahydrofuranylmethyl (meth)acrylate (or tetrahydrofurfuryl (meth)acrylate), 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2,3-dihydroxypropyl (meth)acrylate, 2,Examples include, but are not limited to, hydroxyl group-containing (meth)acrylates, including 2-dihydroxyethyl (meth)acrylate, polyethylene glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, alkyloxypolyethylene glycol mono(meth)acrylate, and alkyloxypolypropylene glycol mono(meth)acrylate. 【0038】 A curable composition according to an example of this application may contain a polyorganosiloxane component in an amount of 50% or more by weight, 52% or more by weight, 54% or more by weight, 56% or more by weight, 58% or more by weight, 60% or more by weight, 62% or more by weight, 64% or more by weight, 66% or more by weight, or 68% or more by weight, or 95% or less by weight, 94% or less by weight, 93% or less by weight, or 92% or less by weight. When the polyorganosiloxane component is contained within the above ranges, it is possible to ensure not only appropriate release strength but also excellent residual adhesion. 【0039】 In a curable composition according to an example of this application, the polyorganosiloxane component may include a first polyorganosiloxane component represented by the following chemical formula 1. By including the first polyorganosiloxane component represented by the following chemical formula 1, the curable composition can ensure not only appropriate release strength but also excellent residual adhesion. 【0040】 [Chemical formula 1] [ka] 【0041】 In chemical formula 1, R1, R7 and R 10Each of these may independently be an alkenyl group, isocyanate group, or amine group having 2 to 20, 2 to 18, 2 to 16, 2 to 14, 2 to 12, 2 to 10, 2 to 8, 2 to 6, or 2 to 4 carbon atoms. The first polyorganosiloxane component represented by chemical formula 1 can ensure a high level of curing properties by having at least three functional groups be alkenyl groups, isocyanate groups, or amine groups. 【0042】 In Chemical Formula 1, R2, R3, R4, R5, R6, R8, and R9 may each be independently an alkyl group having 1 to 20 carbon atoms, 1 to 18 carbon atoms, 1 to 16 carbon atoms, 1 to 14 carbon atoms, 1 to 12 carbon atoms, 1 to 10 carbon atoms, 1 to 8 carbon atoms, 1 to 6 carbon atoms, 1 to 4 carbon atoms, or 1 to 3 carbon atoms; an alkenyl group having 2 to 20 carbon atoms, 2 to 18 carbon atoms, 2 to 16 carbon atoms, 2 to 14 carbon atoms, 2 to 12 carbon atoms, 2 to 10 carbon atoms, 2 to 8 carbon atoms, 2 to 6 carbon atoms, or 2 to 4 carbon atoms; an isocyanate group, or an amine group. 【0043】 Furthermore, in chemical formula 1, m and n may each be independently within the ranges of 1 to 10,000, 1 to 8,000, 1 to 6,000, 1 to 4,000, 1 to 3,000, 1 to 2,000, or 1 to 1,000. More specifically, in chemical formula 1, m may be within the ranges of 1 to 5,000, 10 to 4,500, 50 to 5,000, 100 to 4,500, 500 to 4,000, or 1,000 to 3,000. Also, in chemical formula 1, n may be within the ranges of 1 to 100, 2 to 75, 3 to 50, or 4 to 25. 【0044】 The first polyorganosiloxane component of the curable composition according to an example of this application has a weight-average molecular weight of 100,000 g / mol or more, 125,000 g / mol or more, 150,000 g / mol or more, 175,000 g / mol or more, 200,000 g / mol or more, 225,000 g / mol or more, 250,000 g / mol or more, 275,000 g / mol or more, or 300,000 g / mol or more, or 1,000,000 The weight-average molecular weight may be less than or equal to g / mol, less than or equal to 950,000 g / mol, less than or equal to 900,000 g / mol, less than or equal to 850,000 g / mol, less than or equal to 800,000 g / mol, less than or equal to 750,000 g / mol, less than or equal to 700,000 g / mol, less than or equal to 650,000 g / mol, less than or equal to 600,000 g / mol, less than or equal to 550,000 g / mol, less than or equal to 500,000 g / mol, less than or equal to 450,000 g / mol, or less than or equal to 400,000 g / mol. When the weight-average molecular weight of the first polyorganosiloxane component is within the above range, an appropriate viscosity can be ensured, and thus excellent coating properties can be ensured. 【0045】 The first polyorganosiloxane component of the curable composition according to an example of this application may have a polydispersity index (PDI) in the range of 1 to 5, 1.25 to 3.5, or 1.5 to 2.5. If the first polyorganosiloxane component does not have a polydispersity index within the above range, the content of components with molecular weights smaller than the desired weight-average molecular weight increases, which may lead to a problem of reduced physical properties of the cured product. 【0046】 In a curable composition according to an example of this application, the polyorganosiloxane component may be present in an amount of 70% or more, 75% or more, 80% or more, 85% or more, 90% or more, or 95% or more by weight relative to the total weight of the polyorganosiloxane component, or in an amount of 99.9% or less, 99% or less, or 98% or less by weight. When the first polyorganosiloxane component is present within the above range, it is possible to ensure not only appropriate release strength but also excellent residual adhesion. 【0047】 In a curable composition according to an example of this application, the polyorganosiloxane component may include a second polyorganosiloxane component represented by the following chemical formula 2. By including the second polyorganosiloxane component represented by the following chemical formula 2, the curable composition can improve the crosslinking density and ensure excellent durability. 【0048】 [Chemical formula 2] [ka] 【0049】 In chemical formula 2, R 11 ~R 19 Each of these may independently be an alkyl group having 1 to 20 carbon atoms, 1 to 18 carbon atoms, 1 to 16 carbon atoms, 1 to 14 carbon atoms, 1 to 12 carbon atoms, 1 to 10 carbon atoms, 1 to 8 carbon atoms, 1 to 6 carbon atoms, 1 to 4 carbon atoms, or 1 to 3 carbon atoms. 【0050】 Furthermore, in chemical formula 2, a and b may each be independently within the ranges of 1 to 10,000, 1 to 8,000, 1 to 6,000, 1 to 4,000, 1 to 3,000, 1 to 2,000, or 1 to 1,000. More specifically, in chemical formula 2, a and b may each be independently within the ranges of 2 to 500, 5 to 250, 10 to 200, 15 to 150, 20 to 100, or 25 to 50. 【0051】 The second polyorganosiloxane component of the curable composition according to an example of this application has a weight-average molecular weight of 1,000 g / mol or more, 1,500 g / mol or more, 2,000 g / mol or more, 2,500 g / mol or more, 3,000 g / mol or more, 3,500 g / mol or more, 4,000 g / mol or more, 4,500 g / mol or more, 5,000 g / mol or more, 5,500 g / mol or more, 6,000 g / mol or more, and 6,500 The weight-average molecular weight may be g / mol or more, 7,000 g / mol or more, 7,500 g / mol or more, or 8,000 g / mol or more, or it may be 50,000 g / mol or less, 45,000 g / mol or less, 40,000 g / mol or less, 35,000 g / mol or less, 30,000 g / mol or less, 25,000 g / mol or less, 20,000 g / mol or less, 15,000 g / mol or less, or 12,000 g / mol or less. When the weight-average molecular weight of the second polyorganosiloxane component is within the above range, excellent curability can be ensured. 【0052】 The second polyorganosiloxane component of the curable composition according to an example of this application may have a polydispersity index (PDI) in the range of 1 to 5, 1.25 to 3.5, or 1.5 to 2.5. When the second polyorganosiloxane component has a polydispersity index within the above range, excellent curability, uniform crosslinking density, and curability can be ensured. 【0053】 A curable composition according to an example of this application may contain the second polyorganosiloxane component in an amount of 0.1 parts by weight or more, 0.25 parts by weight or more, 0.5 parts by weight or more, 0.75 parts by weight or more, 1 part by weight or more, 1.25 parts by weight or more, 1.5 parts by weight or more, 1.75 parts by weight or more, or 2 parts by weight or more, or 10 parts by weight or less, 8 parts by weight or less, 6 parts by weight or less, or 4 parts by weight or less, per 100 parts by weight of the first polyorganosiloxane component. When the second polyorganosiloxane component is contained within the above ranges, an appropriate crosslinking density can be improved to ensure excellent durability. 【0054】 As mentioned above, a curable composition according to one example of this application may contain a redox catalyst. 【0055】 In the manufacturing process of optical materials such as polarizing plates and phase difference plates, which are components of liquid crystal displays, a surface protection film is used to protect the surface of the optical material. The surface protection film includes a release layer and an adhesive layer, and the adhesive layer is generally manufactured from an acrylic composition containing an acrylic compound. Here, in order to manufacture the adhesive layer, a process is carried out to cure the acrylic composition using heat or energy rays. 【0056】 A curable composition according to one example of this application can form a cured product that provides surface protection while also curing an acrylic compound that forms an adhesive layer. Through the curable composition, a curing process using heat or energy rays can be omitted for the acrylic composition to form the adhesive layer, thereby simplifying the process, improving productivity, and reducing costs. 【0057】 The redox catalyst of the curable composition according to an example of this application may include at least one selected from the group consisting of naphtenate metal salts such as cobalt(II) naphtenate, acetate hydrate metal salts such as cobalt(II) acetate tetrahydrate, alkanoate metal salts such as cobalt(II) 2-ethylhexanoate, sulfate hydrate metal salts such as iron(II) sulfate hydrate, acetylacetonate metal salts such as iron(II) acetylacetonate, halogenated metal salts such as copper(I) chloride, and alkoxide metal salts such as titanium(IV) isopropoxide. In the redox catalyst described above, the metal salt may be a transition metal salt, and examples of such transition metals include, but are not limited to, titanium (Ti), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), molybdenum (Mo), lead (Pd), silver (Ag), or cadmium (Cd). 【0058】 A curable composition according to an example of this application may contain a redox catalyst in an amount of 0.01 parts by weight or more, 0.05 parts by weight or more, 0.1 parts by weight or more, 0.2 parts by weight or more, 0.3 parts by weight or more, 0.4 parts by weight or more, 0.5 parts by weight or more, 0.6 parts by weight or more, 0.7 parts by weight or more, or 0.8 parts by weight or more per 100 parts by weight of the polyorganosiloxane component, or 80 parts by weight or less, 75 parts by weight or less, 70 parts by weight or less, 65 parts by weight or less, 60 parts by weight or less, 55 parts by weight or less, 50 parts by weight or less, or 45 parts by weight or less. When the redox catalyst is included within the above range, it is possible to ensure not only appropriate release strength but also excellent residual adhesion while curing the acrylic compound that forms the adhesive layer. 【0059】 A curable composition according to an example of this application may contain a redox catalyst in an amount of 0.01 parts by weight or more, 0.05 parts by weight or more, 0.1 parts by weight or more, 0.2 parts by weight or more, 0.3 parts by weight or more, 0.4 parts by weight or more, 0.5 parts by weight or more, 0.6 parts by weight or more, 0.7 parts by weight or more, or 0.8 parts by weight or more, or 80 parts by weight or less, 75 parts by weight or less, 70 parts by weight or less, 65 parts by weight or less, 60 parts by weight or less, 55 parts by weight or less, 50 parts by weight or less, or 45 parts by weight or less, based on 100 parts by weight of the first polyorganosiloxane component. In particular, when the redox catalyst is included in combination with the first polyorganosiloxane component described above within the above range, it is possible to efficiently cure the acrylic compound that forms the adhesive layer while ensuring not only appropriate release strength but also excellent residual adhesion. 【0060】 A curable composition according to an example of this application may further contain a metal catalyst for carrying out a cured product formation reaction. The metal catalyst may contain at least one selected from the group consisting of aluminum, bismuth, lead, mercury, tin, zinc, platinum, silver, and zirconium as a central metal element. The metal catalyst may also have a siloxane group, ester group, ether group, or carboxyl group bonded to the central metal element. Examples of the metal catalyst include Bis[1,3-bis(2-ethenyl)-1,1,3,3-tetramethyldisiloxane]platinum (CAS No. 81032-58-8), dibutylthin dilaurate, or dimethylthin diacetate, but is not particularly limited thereto, and any metal catalyst commonly used in the industry may be used without limitation. 【0061】 The metal catalyst is preferably a platinum catalyst containing platinum (Pt) as the central metal element, considering the components included in the curable composition. The curable composition may also contain the platinum catalyst in an amount of 0.1 parts by weight or more, 0.5 parts by weight or more, 1 part by weight or more, 1.5 parts by weight or more, 2 parts by weight or more, 2.5 parts by weight or more, or 3 parts by weight or more, or 10 parts by weight or less, 9 parts by weight or less, 8 parts by weight or less, 7 parts by weight or less, 6 parts by weight or less, 5 parts by weight or less, or 4 parts by weight or less, per 100 parts by weight of the polyorganosiloxane component. Furthermore, when the content ratio of the platinum catalyst satisfies the above range, the cured product formation reaction can be carried out effectively while reducing side reactions. 【0062】 A curable composition according to an example of this application may further contain one or more additives as exemplified below to ensure further physical properties. However, the additives are not necessarily limited to those exemplified below, as they are generally available in the industry. 【0063】 A curable composition according to an example of this application may further contain a dispersant. The dispersant may be, for example, polyamidoamines and their salts, polycarboxylic acids and their salts, modified polyurethanes, modified polyesters, modified poly(meth)acrylates, (meth)acrylic copolymers, naphthalene sulfonic acid formalin condensates, polyoxyethylene alkyl phosphates, polyoxyethylene alkylamines, and pigment derivatives, but may be used without limitation as long as it is a dispersant known in the art. For example, Disperbyk-1799 (BYK) may be used. 【0064】 A curable composition according to an example of this application may further contain a plasticizer. The type of plasticizer is not particularly limited, but for example, one or more may be selected from phthalate compounds, phosphoric acid compounds, adipic acid compounds, sebaciate compounds, citrate compounds, glycolic acid compounds, trimellitic acid compounds, polyester compounds, epoxidized soybean oil, chlorinated paraffin, chlorinated fatty acid esters, fatty acid compounds, and vegetable oils. 【0065】 The phthalate compound may be at least one of dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dihexyl phthalate, di-n-octyl phthalate, di-2-ethylhexyl phthalate, diisooctyl phthalate, dicapryl phthalate, dinonyl phthalate, diisononyl phthalate, didecyl phthalate, diundecyl phthalate, dilauryl phthalate, ditridecyl phthalate, dibenzyl phthalate, dicyclohexyl phthalate, butyl benzyl phthalate, octyldecyl phthalate, butyl octyl phthalate, octyl benzyl phthalate, n-hexyl n-decyl phthalate, n-octyl phthalate, and n-decyl phthalate. The phosphate compound may be at least one of tricresyl phosphate, trioctyl phosphate, triphenyl phosphate, octyldiphenyl phosphate, cresyldiphenyl phosphate, and trichloroethyl phosphate. The adipic acid compound may be at least one of dibutoxyethoxyethyl adipate (DBEEA), dioctyl adipate, diisooctyl adipate, di-n-octyl adipate, didecyl adipate, diisononyl adipate (DINA), diisodecyl adipate (DIDP), n-octyl n-decyl adipate, n-heptyl adipate, and n-nonyl adipate. The sebacate acid compound may be at least one of dibutyl sebacate, dioctyl sebacate, diisooctyl sebacate, and butyl benzyl. The citrate compound may be at least one of triethyl citrate, acetyl triethyl citrate, tributyl citrate, acetyl tributyl citrate, and acetyl trioctyl citrate. The glycolic acid compound may be at least one of methylphthalylethyl glycolate, ethylphthalylethyl glycolate, and butylphthalylethyl glycolate. The trimellitic acid compound may be at least one of trioctyl trimellitate and tri-n-octyl n-decyl trimellitate.The polyester compound may be a reaction product of butanediol, ethylene glycol, propane 1,2-diol, propane 1,3-diol, polyethylene glycol, glycerol, diols selected from diacids (adipic acid, succinic acid, succinic anhydride) and hydroxy acids (e.g., hydroxystearic acid). 【0066】 A curable composition according to one example of this application may further contain a reaction accelerator as needed. The reaction accelerator can perform the function of accelerating the curing reaction of the curable composition. The type of reaction accelerator is not particularly limited, but for example, dimethyl-p-toluidine (N,N-Dimethyl-p-toluidine; DMPT) may be used. 【0067】 A curable composition according to an example of this application may further contain viscosity modifiers, such as thixotropy imparters, diluents, surface treatment agents, dispersion stabilizers, reaction control agents, or coupling agents, to adjust viscosity as needed, for example, to increase or decrease viscosity, or to adjust viscosity by shear force. Thixotropy imparters can adjust the viscosity of the curable composition by shear force. Examples of usable thixotropy imparters include fumed silica. Diluents are typically used to reduce the viscosity of the curable composition, and various types known in the art may be used without limitation, as long as they can exhibit the effects described above. Surface treatment agents are for surface treatment of filler compositions introduced into the cured product of the curable composition, and various types known in the art may be used without limitation, as long as they can exhibit the effects described above. Dispersion stabilizers may be used to stabilize the dispersibility between components in the curable composition, and various types known in the art may be used without limitation, as long as they can exhibit the effects described above. Reaction control agents may be used to control chemical reactions such as the curing of a curable composition, and any type known in the industry may be used without limitation as long as it can exhibit the effects described above. In the case of coupling agents, for example, they may be used to improve the dispersibility between components in a curable composition, and specifically, silane coupling agents may be used, such as Shin-Etsu's KBM403 or KBM-5103. Furthermore, any type known in the industry may be used without limitation as long as it can exhibit the effects described above. 【0068】 A curable composition according to an example of this application may be dispersed in a solvent. As used in this application, dispersion means a state in which the solute is dissolved in the solvent, and also means a state in which the solute is spread uniformly even if it is not dissolved in the solvent. 【0069】 The solvent may be an organic solvent, considering the composition of the curable composition. The organic solvent is not particularly limited as long as it is commonly used in the industry, and may include tetrahydrofuran, methyl ethyl ketone, toluene, heptane, or mixtures thereof. 【0070】 The solvent may be used in an amount sufficient to sufficiently disperse the curable composition. Specifically, although not particularly limited, the solvent may be used in amounts of 500 parts by weight or more, 600 parts by weight or more, 700 parts by weight or more, 800 parts by weight or more, 900 parts by weight or more, 1,000 parts by weight or more, 1,100 parts by weight or more, 1,200 parts by weight or more, 1,300 parts by weight or more, 1,400 parts by weight or more, or 1,500 parts by weight or more per 100 parts by weight of the curable composition. 【0071】 As described above, a curable composition according to one example of this application can cure an acrylic composition through a combination of a polyorganosiloxane component and a redox catalyst, ensuring excellent curing properties for the acrylic composition and allowing it to possess various physical properties. Furthermore, the curable composition can cure the acrylic composition without the use of heat and / or active energy rays, ensuring excellent curing properties and allowing it to possess various physical properties even in such curing. 【0072】 An example of a curable composition according to this application can cure an acrylic composition at a curing temperature of 10°C or higher, 12.5°C or higher, 15°C or higher, 17.5°C or higher, 20°C or higher, or 60°C or lower, 57.5°C or lower, 55°C or lower, 52.5°C or lower, or 50°C or lower. 【0073】 A curable composition according to an example of this application, with a residual adhesion ratio (A) according to the following general formula 1. d ) may be 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, or 85% or more. The residual adhesion rate (A d The upper limit of (A) is not particularly limited, but it may be 100% or less, less than 100%, or 99% or less. Residual adhesion rate (A) according to General Formula 1 dSpecifically, this may be measured by the following physical property measurement method. That is, the curable composition can ensure an excellent level of residual adhesion according to the following general formula 1 by appropriately curing the acrylic composition. 【0074】 [General formula 1] Residual adhesion rate (A d )=A f / A i ×100(%) 【0075】 In general formula 1, A i This is the 25°C release force of the cured acrylic composition measured at the interface of a PET (polyethylene terephthalate) film with a peel angle of 180 degrees and a peel speed of 0.3 m / min, and A f is the aforementioned A i After measuring the acrylic composition, the cured product was again attached to the interface of the PET film, and the 25°C release force was measured at a peel angle of 180 degrees and a peel speed of 0.3 m / min. 【0076】 An example of a curable composition according to this application shows that, by appropriately curing an acrylic composition, the 25°C release force measured at the interface of a PET (polyethylene terephthalate) film with a peel angle of 180 degrees and a peel speed of 0.3 m / min is 50 gf / inch (19.3 kg / s²). 2 ) or less, 45 gf / inch or less, 40 gf / inch or less, or 35 gf / inch or less, or 10 gf / inch or more, 11 gf / inch or more, 12 gf / inch or more, 13 gf / inch or more, 14 gf / inch or more, or 15 gf / inch or more. The 25°C release force measured here may be specifically measured by the following physical property measurement method. 【0077】 A curable composition according to an example of this application can satisfy the unreacted content (T1 and T2) according to the following general formulas 2 and 3 within the specified ranges by appropriately curing an acrylic composition. 【0078】 The content of unreacted matter (T1) of the cured acrylic composition cured by the curable composition may be 60% or less, 58% or less, 56% or less, 54% or less, 52% or less, 50% or less, 48% or less, or 46% or less, according to the following general formula 2. The lower limit of the content of unreacted matter (T1) is not particularly limited, as a lower amount results in better curing properties, but it may be 0.01% or more, 0.1% or more, or 1% or more. When the content of unreacted matter (T1) according to the following general formula 2 satisfies the above numerical range, it is possible to secure a curable composition in which the acrylic composition has excellent curing properties even without irradiation with heat or energy rays, while having the desired release force and residual adhesion rate after curing. 【0079】 [General formula 2] T1 = 100 × (W A -W B ) / W A 【0080】 In general formula 2, W A W is the initial weight of the cured product obtained by curing the acrylic composition at 25°C. B This refers to the post-curing weight of the cured acrylic composition after storing the cured acrylic composition, whose initial weight was measured, in an oven at 150°C for 1 hour. Here, the cured acrylic composition may be formed by leaving it to cure for a curing time sufficient for it to cure sufficiently at 25°C. Specifically, the curing time may be, for example, 10 hours or more, 11 hours or more, or 12 hours or more, or 30 hours or less, 25 hours or less, or 20 hours or less. The curing time may be 12 hours or 20 hours. Furthermore, T1 according to general formula 2 may be measured specifically by the following physical property measurement method. 【0081】 The unreacted material content (T2) of the cured acrylic composition cured by the curable composition may be 50% or less, 48% or less, 46% or less, 44% or less, 42% or less, or 40% or less, according to the following general formula 3. The lower limit of the unreacted material content (T2) is not particularly limited, as a lower limit results in better curing properties, but it may be 0.01% or more, 0.1% or more, or 1% or more. When the unreacted material content (T2) according to the following general formula 3 satisfies the above numerical range, the acrylic composition will have excellent curing properties even without irradiation with heat or energy rays, and after curing, it will have the desired properties. 【0082】 [General formula 3] T2 = 100 × (W C -W D ) / W C 【0083】 In general formula 3, W C This is the initial weight of the cured product obtained by curing the acrylic composition at 50°C, and W D This refers to the post-curing weight of the cured acrylic composition after storing the cured acrylic composition, whose initial weight was measured, in an oven at 150°C for 1 hour. Here, the cured acrylic composition may be formed by leaving it for a curing time sufficient for it to harden sufficiently. Specifically, the curing time may be, for example, 10 hours or more, 11 hours or more, 12 hours or more, or 30 hours or less, 25 hours or less, or 20 hours or less. The curing time may be 12 hours or 20 hours. Furthermore, T2 according to general formula 3 may be measured specifically by the following physical property measurement method. 【0084】 An example of an acrylic composition according to this application may include an acrylic polymer component and an acrylic monomer component. The acrylic polymer component may include a polymer polymerized (or copolymerized) with one or more acrylic compounds. For example, the polymer may be obtained by adding a photoinitiator to a composition containing an alkyl group-containing (meth)acrylate and a hydroxyl group-containing (meth)acrylate, and then photoinitiating the process. More specifically, the polymer may be obtained with a weight ratio (K1 / K2) of alkyl group-containing (meth)acrylate (K1) and hydroxyl group-containing (meth)acrylate (K2) of 1 or more, 1.25 or more, or 1.5 or more, or 3 or less, 2.5 or less, or 2 or less. 【0085】 The acrylic monomer component may contain one or more acrylic compounds. For example, the acrylic monomer component may contain an alkyl group-containing (meth)acrylate and a hydroxyl group-containing (meth)acrylate. For example, the acrylic monomer component may contain alkyl group-containing (meth)acrylate in an amount of 50% or more, 55% or more, 60% or more, 65% or more, or 70% or more by weight, or 90% or less by weight, 85% or less, 80% or less by weight, or 75% or less by weight, based on the total weight of the acrylic monomer component. The acrylic monomer component may also contain hydroxyl group-containing (meth)acrylate in an amount of 10 parts by weight or more, 15 parts by weight or more, 20 parts by weight or more, 25 parts by weight or more, or 50 parts by weight or less, 45 parts by weight or less, 40 parts by weight or less, or 35 parts by weight or less, based on 100 parts by weight of alkyl group-containing (meth)acrylate. 【0086】 In the acrylic composition, the acrylic polymer component and the acrylic monomer component may be included in an appropriate content ratio so that the cured product (which can form an adhesive layer) has the desired adhesive strength and excellent durability while being easily cured by the release layer. Specifically, the acrylic polymer component may be included in an amount of 5% or more by weight, 6% or more by weight, 7% or more by weight, 8% or more by weight, 9% or more by weight, or 10% or more by weight, or 20% or less by weight, 19% or less by weight, 18% or less by weight, 17% or less by weight, 16% or less by weight, 15% or less by weight, 14% or less by weight, 13% or less by weight, 12% or less by weight, or 11% or less by weight, based on the total weight of the acrylic composition. More specifically, the acrylic monomer component may be included in an amount of 300 parts by weight or more, 350 parts by weight or more, 400 parts by weight or more, 450 parts by weight or more, 500 parts by weight or more, 550 parts by weight or more, 600 parts by weight or more, 650 parts by weight or more, 700 parts by weight or more, 750 parts by weight or more, 800 parts by weight or more, or 850 parts by weight or more, or 1,500 parts by weight or less, 1,400 parts by weight or less, 1,300 parts by weight or less, 1,200 parts by weight or less, 1,100 parts or less, or 1,000 parts by weight or less, per 100 parts by weight of the acrylic polymer component. 【0087】 Furthermore, the acrylic composition may optionally contain additional additives, the additives of which may include at least one selected from the group consisting of metal catalysts, dispersants, plasticizers, initiators, and reaction accelerators. The metal catalysts, dispersants, plasticizers, and reaction accelerators may be appropriately selected and used in the above examples. The initiator may include a peroxide compound, the peroxide compound being a substance that initiates the polymerization reaction of the acrylic composition. The peroxide compound may be, for example, methyl ethyl ketone peroxide. peroxide (MEKP), ketone peroxide compounds such as cyclohexanone peroxide, 3,3,5-trimethylcyclohexanone peroxide, methylcyclohexanone peroxide, methylacetoacetate peroxide and acetylacetone peroxide, hydroperoxide compounds such as tert-butyl hydroperoxide, cumene hydroperoxide, diisopropylbenzene hydrooxide, paramentane hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide and 1,1,3,3-tetramethylbutyl hydroperoxide, diacyl peroxide compounds such as acetyl peroxide, isobutyl peroxide, octanoyl peroxide, decanoyl peroxide, laurinoyl peroxide, 3,3,5-trimethylhexanoyl peroxide, succinate peroxide, benzoyl peroxide, 2,4-dichlorobenzoyl peroxide and meta-toluyl peroxide, benzoyl peroxide (benzoyl peroxide, Acyl peroxide compounds such as BPO may be used, but are not limited to them. Furthermore, one or more peroxide compounds may be used. 【0088】 A protective film according to an example of this application may include a base film and a cured product of a curable composition according to an example of this application. The protective film may include a base film, an adhesive layer and a release layer, and the curable composition according to an example of this application may be formed as a release layer, and the acrylic composition can be cured to form an adhesive layer. 【0089】 The protective film may specifically be a protective film for an optical element. For example, it may be used as a protective film for optical elements such as polarizers, polarizers, polarizer protective films, phase difference films, viewing angle compensation films, and brightness enhancement films. In this specification, the terms polarizer and polarizer refer to distinct entities. That is, a polarizer refers to the film, sheet, or element itself that exhibits a polarizing function, while a polarizer refers to an optical element that includes other elements along with the polarizer. Other elements that may be included in an optical element along with a polarizer include, but are not limited to, a polarizer protective film or a phase difference layer. 【0090】 Furthermore, the protective film may be effectively used as a surface protective film to protect the surface of optical elements such as polarizing plates, phase difference plates, optical compensation films, reflective sheets, and brightness enhancement films used in various optical devices or components, display devices or components, such as LCDs, but the uses are not limited to the protective film. 【0091】 The base film included in the protective film according to an example of this application may be a general film or sheet known in the industry. Examples include polyester films such as polyethylene terephthalate or polybutylene terephthalate, polytetrafluoroethylene films, polyethylene films, polypropylene films, polybutene films, polybutadiene films, poly(vinyl chloride) films, or polyimide films. Such films may consist of a single layer or two or more layers laminated together, and may further include functional layers such as an antifouling layer or an antistatic layer. Furthermore, from the viewpoint of improving adhesion to the base material, one or both sides of the base material may be subjected to surface treatment such as primer treatment. 【0092】 The thickness of the base film is not particularly limited and can be appropriately selected according to the application, and is usually formed to a thickness of 5 μm to 500 μm, 5 μm to 250 μm, or 5 μm to 100 μm. 【0093】 The adhesive layer included in the protective film according to an example of this application may be formed by curing an adhesive composition. The adhesive composition may also be the aforementioned acrylic composition, and the adhesive layer may be formed by curing the acrylic composition. Specifically, the adhesive layer may be formed by curing after coating it on a release layer, which will be described later. Here, the acrylic composition is the same as described above, so a detailed explanation will be omitted. The coating method for the acrylic composition is not particularly limited as long as it is commonly used in the industry, for example, knife coating, roll coating, or reverse coating. Furthermore, when forming the adhesive layer, it is preferable to thoroughly remove bubble-inducing components such as volatile components and reaction residues in the acrylic composition. This prevents problems such as the crosslinking density or molecular weight of the adhesive layer being too low, which reduces the elastic modulus, causing bubbles between the glass plate and the adhesive layer to enlarge at high temperatures and form scattering bodies inside. 【0094】 The thickness of the adhesive layer included in the protective film is not particularly limited and may be, for example, 2 μm to 100 μm or 5 μm to 50 μm. 【0095】 The adhesive layer of the protective film according to an example of this application has a residual adhesion ratio (A) according to the following general formula 1. d ) may be 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, or 85% or more. The residual adhesion rate (A d The upper limit of (A) is not particularly limited, but it may be 100% or less, less than 100%, or 99% or less. Residual adhesion rate (A) according to General Formula 1 d Specifically, this may be measured by the following physical property measurement method. Furthermore, if the adhesive layer of the protective film has a residual adhesion rate within the above range, a protective film with excellent reworkability can be ensured. 【0096】 [General formula 1] Residual adhesion rate (Ad )=A f / A i ×100(%) 【0097】 In general formula 1, A i This is the 25°C release force of the adhesive layer measured at the interface of the PET (polyethylene terephthalate) film with a peel angle of 180 degrees and a peel speed of 0.3 m / min, and A f is the aforementioned A i After measurement, the adhesive layer was reattached to the interface of the PET film, and the 25°C release force of the adhesive layer was measured at a peeling angle of 180 degrees and a peeling speed of 0.3 m / min. 【0098】 The adhesive layer of the protective film according to this application, as an example, exhibits a 25°C release force of 50 gf / inch (19.3 kg / s) measured at a peel angle of 180 degrees and a peel speed of 0.3 m / min at the interface of a PET (polyethylene terephthalate) film. 2 ) or less, 45 gf / inch or less, 40 gf / inch or less, or 35 gf / inch or less, or 10 gf / inch or more, 11 gf / inch or more, 12 gf / inch or more, 13 gf / inch or more, 14 gf / inch or more, or 15 gf / inch or more. The 25°C release force measured here may be specifically measured by the physical property measurement method described below. Furthermore, if the adhesive layer of the protective film has a 25°C release force within the above range, separation from the adherend can be prevented, protecting its surface while preventing damage to the surface of the adherend when the protective film is peeled off during the process. 【0099】 The release layer included in the protective film according to an example of this application is obtained by curing the curable composition according to the example of this application described above. Here, the method for curing the curable composition is not particularly limited and may be cured by a suitable maturation process or by curing in a suitable high-temperature environment or light irradiation environment. The thickness of the release layer included in the protective film is not particularly limited and may be, for example, 10 nm to 10 μm, 10 nm to 1 μm, or 10 nm to 100 nm. 【0100】 The adhesive layer of the protective film according to an example of this application may have its curing properties and physical properties determined by the composition and content ratio of the curable composition according to an example of this application that forms the release layer. Here, the adhesive layer may be formed by curing the acrylic composition as described above, but the curing temperature may be 10°C or higher, 12.5°C or higher, 15°C or higher, 17.5°C or higher, 20°C or higher, or 60°C or lower, 57.5°C or lower, 55°C or lower, 52.5°C or lower, or 50°C or lower. However, this means that the acrylic composition can be cured even at the curing temperature by the cured product of the curable composition according to an example of this application (i.e., the release layer), and the curing reaction may also be carried out at a temperature higher than the curing temperature, such as 60°C or higher, 65°C or higher, 70°C or higher, 75°C or higher, or 80°C or higher. 【0101】 In particular, the acrylic composition exhibits excellent curing reactions within the aforementioned temperature range, even without high temperatures or active energy rays (e.g., ultraviolet light), based on the redox catalyst contained in the release layer. 【0102】 The curing properties of the acrylic composition applied to the release layer may be determined by measuring the unreacted material content (TML, Totalmass Loss). The curing properties of the acrylic composition can be confirmed by the unreacted material content (T1 and T2) according to the following general formulas 2 and 3, and if the unreacted material content (T1 and T2) is within the specified range, the curing properties can be evaluated as excellent. 【0103】 Regarding the curing properties of the acrylic composition, the unreacted material content (T1) according to the following general formula 2 may be 60% or less, 58% or less, 56% or less, 54% or less, 52% or less, 50% or less, 48% or less, or 46% or less. The lower limit of the unreacted material content (T1) is not particularly limited, as a lower limit results in better curing properties, but it may be 0.01% or more, 0.1% or more, or 1% or more. When the unreacted material content (T1) according to the following general formula 2 for the acrylic composition satisfies the above numerical range, it is possible to ensure excellent curing properties without irradiation of heat or energy rays, while also ensuring the desired release strength and residual adhesion rate after curing. 【0104】 [General formula 2 T1 = 100 × (W A -W B ) / W A 【0105】 In general formula 2, W A This is the initial weight of the cured product obtained by curing the acrylic composition at 25°C, and W B This refers to the post-curing weight of the cured acrylic composition after storing the cured acrylic composition, whose initial weight was measured, in an oven at 150°C for 1 hour. Here, the cured acrylic composition may be formed by leaving it to cure for a curing time sufficient for it to cure at 25°C, and specifically, the curing time may be, for example, 10 hours or more, 11 hours or more, or 12 hours or more, or 30 hours or less, 25 hours or less, or 20 hours or less. Furthermore, T1 according to general formula 2 may be specifically measured by the following physical property measurement method. 【0106】 Regarding the curing properties of the acrylic composition, the unreacted material content (T2) according to the following general formula 3 may be 50% or less, 48% or less, 46% or less, 44% or less, 42% or less, or 40% or less. The lower limit of the unreacted material content (T2) is not particularly limited, as a lower limit results in better curing properties, but it may be 0.01% or more, 0.1% or more, or 1% or more. When the unreacted material content (T2) according to the following general formula 3 for the acrylic composition satisfies the above numerical range, it is possible to ensure excellent curing properties without irradiation of heat or energy rays, while also ensuring the desired release force and residual adhesion rate after curing. 【0107】 [General formula 3] T2 = 100 × (W C -W D ) / W C 【0108】 In general formula 3, W C This is the initial weight of the cured product obtained by curing the acrylic composition at 50°C, and W D This refers to the post-curing weight of the cured acrylic composition after storing the cured acrylic composition, whose initial weight was measured, in an oven at 150°C for 1 hour. Here, the cured acrylic composition may be formed by leaving it for a curing time sufficient for it to harden sufficiently. Specifically, the curing time may be, for example, 10 hours or more, 11 hours or more, or 12 hours or more, or 30 hours or less, 25 hours or less, or 20 hours or less. Furthermore, T2 according to general formula 3 may be measured specifically by the following physical property measurement method. 【0109】 An optical element according to an example of this application may have the protective film attached to its surface. For example, the adhesive layer of the protective film may be attached to the surface of the optical element, thereby protecting the optical element with the surface protective substrate film. 【0110】 Examples of optical elements included in the optical element are polarizers, polarizing plates, polarizer protective films, phase difference layers, or viewing angle compensation layers. The polarizer may be any common type known in the industry, such as a polyvinyl alcohol polarizer, without limitation. 【0111】 A polarizer is a functional film or sheet that can extract only light vibrating in one direction from light that is incident while vibrating in various directions. Such a polarizer may be in the form of a polyvinyl alcohol-based resin film on which a dichroic dye is adsorbed and oriented. The polyvinyl alcohol-based resin constituting the polarizer can be obtained, for example, by gelling a polyvinyl acetate-based resin. In this case, the usable polyvinyl acetate-based resin may include not only a homopolymer of vinyl acetate, but also copolymers of vinyl acetate and other monomers copolymerizable with the aforementioned. Examples of monomers copolymerizable with vinyl acetate include, but are not limited to, one or more of unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having ammonium groups. The degree of gelation of the polyvinyl alcohol-based resin is usually about 85 mol% to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol-based resin may be further modified; for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may also be used. The degree of polymerization of the polyvinyl alcohol-based resin is usually around 1,000 to 10,000, preferably around 1,500 to 5,000. 【0112】 A polyvinyl alcohol-based resin film may be formed and used as the base film for a polarizer. The method for forming the polyvinyl alcohol-based resin film is not particularly limited, and a general method known in this field may be used. The thickness of the base film formed from the polyvinyl alcohol-based resin is not particularly limited and may be appropriately controlled within the range of, for example, 1 μm to 150 μm. Considering the ease of stretching, the thickness of the base film may be controlled to 10 μm or more. The polarizer may be manufactured by a process such as stretching (e.g., uniaxial stretching) the polyvinyl alcohol-based resin film as described above, a process of dyeing the polyvinyl alcohol-based resin film with a dichroic dye and adsorbing the dichroic dye, a process of treating the polyvinyl alcohol-based resin film on which the dichroic dye has been adsorbed with an aqueous boric acid solution, and a process of washing with water after treatment with the aqueous boric acid solution. As the dichroic dye, iodine or a dichroic organic dye may be used. 【0113】 The polarizing plate may include, for example, the polarizer and other optical films attached to one or both sides of the polarizer. Examples of the other optical films include the polarizer protective film, phase difference layer, viewing angle compensation layer, and anti-glare layer mentioned above. 【0114】 The polarizer protective film is a concept distinct from the protective film containing the adhesive layer, and is a protective film for the polarizer. The polarizer protective film may be formed as a multilayer film in which protective films are laminated, for example, made of cellulosic films such as triacetylcellulose, polyester films such as acrylic films, polycarbonate films or polyethylene terephthalate films, polyethersulfone films and / or polyethylene films, polypropylene films or polyolefin films having a cyclo- or norbornene structure or ethylene propylene copolymer. The thickness of the protective film is not particularly limited and may be formed to an ordinary thickness. 【0115】 A surface treatment layer may be present on the surface of the optical element protected by the protective film. The surface treatment layer may have a surface energy of, for example, 30 mN / m or less. That is, a surface treatment layer with a surface energy of 30 mN / m or less is formed on the surface of the optical element protected by the protective film, and the adhesive layer of the protective film may be attached to the surface treatment layer. The method for measuring the surface energy is not particularly limited, and known surface energy measurement methods may be applied. For example, the contact angle of the surface of the optical element may be measured and the surface energy may be determined from this, or it may be measured using known surface energy measuring equipment. 【0116】 Examples of the aforementioned surface treatment layer include a high-hardness layer, an anti-glare layer such as an AG (Anti-glare) layer or an SG (Semi-glare) layer, or a low-reflection layer such as an AR (Anti-reflection) layer or an LR (Low-reflection) layer. 【0117】 The high-hardness layer may be a layer with a pencil hardness of 1H or higher or 2H or higher under a load of 500g. The pencil hardness may be measured according to the ASTM D 3363 standard using, for example, a pencil lead specified in KS G2603. 【0118】 The high-hardness layer may be, for example, a high-hardness resin layer. The resin layer may contain, for example, a room-temperature curing, moisture-curing, thermosetting, or active-energy ray curing resin composition in a cured state. In one example, the resin layer may contain a thermosetting or active-energy ray curing resin composition, or an active-energy ray curing resin composition in a cured state. In the description of the high-hardness layer, "cured state" means a state in which the components contained in each resin composition undergo a crosslinking reaction or polymerization reaction, etc., and the resin composition becomes hard. Furthermore, the room-temperature curing, moisture-curing, thermosetting, or active-energy ray curing resin composition may mean a composition in which the cured state is induced at room temperature, or induced by the application of heat or irradiation with active energy rays in the presence of appropriate moisture. 【0119】 In this field, various resin compositions are known that can satisfy the aforementioned range of pencil hardness in a cured state, and the average technician can easily select a suitable resin composition. 【0120】 In one example, the resin composition may contain, as a main component, an acrylic compound, an epoxy compound, a urethane compound, a phenolic compound, or a polyester compound. Here, "compound" may refer to a monomer, oligomer, or polymer compound. 【0121】 In one example, the resin composition may be an acrylic resin composition that has excellent optical properties such as transparency and excellent resistance to yellowing, such as an active energy ray curable acrylic resin composition. 【0122】 The active energy ray curable acrylic composition may, for example, contain an active energy ray polymerizable polymer component and a monomer for reactive dilution. 【0123】 Examples of the polymer components include components known in the industry as so-called active energy ray polymerizable oligomers, such as urethane acrylate, epoxy acrylate, ether acrylate, or ester acrylate, or polymers of mixtures containing monomers, such as (meth)acrylic acid ester monomers. Examples of the (meth)acrylic acid ester monomers include alkyl (meth)acrylate, (meth)acrylate having an aromatic group, heterocyclic (meth)acrylate, or alkoxy (meth)acrylate. Various polymer components for producing active energy ray curable compositions are known in this field, and the above-mentioned compounds may be selected as needed. 【0124】 Examples of reactive diluent monomers that may be included in the active energy ray curable acrylic composition include monomers having one or more active energy ray curable functional groups, such as acryloyl groups or methacryloyl groups. For example, the (meth)acrylic acid ester monomer or polyfunctional acrylate may be used as the reactive diluent monomer. 【0125】 The selection of components for producing an active energy ray-curable acrylic composition and the blending ratio of the selected components are not particularly limited and may be adjusted considering the desired hardness and other physical properties of the resin layer. 【0126】 As an anti-glare layer such as an AG layer or SG layer, for example, a resin layer may be used in which an uneven surface is formed or a resin layer containing particles, wherein the particles have a refractive index different from that of the resin layer. 【0127】 As the resin layer, for example, the resin layer used to form the high-hardness layer may be used. When forming an anti-glare layer, it is not necessary to adjust the components of the resin composition so that the resin layer can exhibit high hardness, but the resin layer may be formed in such a way that it can exhibit high hardness. 【0128】 The method for forming the uneven surface on the resin layer is not particularly limited. For example, the resin composition can be cured while the coating layer of the resin composition is in contact with a mold having a desired uneven structure, or particles of an appropriate size can be added to the resin composition, coated, and cured to realize the uneven structure. 【0129】 The anti-glare layer may also be implemented using particles with a different refractive index than the resin layer. 【0130】 In one example, the particles may have a refractive index difference of 0.03 or less, or 0.02 to 0.2, compared to the resin layer. If the refractive index difference is too small, it is less likely to induce haze, while if it is too large, a lot of scattering occurs within the resin layer, increasing the haze, but this may also lead to a decrease in light transmittance and contrast characteristics. Therefore, appropriate particles may be selected taking this into consideration. 【0131】 The shape of the particles contained in the resin layer is not particularly limited and may be spherical, elliptical, polyhedral, amorphous, or other shapes. The average diameter of the particles may be 50 nm to 5,000 nm. In one example, particles with surface irregularities may be used as the particles. Such particles may have an average surface roughness (Rz) of 10 nm to 50 nm or 20 nm to 40 nm, and / or the maximum height of the surface irregularities may be about 100 nm to 500 nm or 200 nm to 400 nm, with a width between the irregularities being 400 nm to 1200 nm or 600 nm to 1000 nm. Such particles have excellent compatibility with the resin layer and dispersibility within it. 【0132】 The aforementioned particles include a variety of inorganic or organic particles. Examples of inorganic particles include silica, amorphous titania, amorphous zirconia, indium oxide, alumina, amorphous zinc oxide, amorphous cerium oxide, barium oxide, calcium carbonate, amorphous barium titanate, or barium sulfate. Examples of organic particles include, but are not limited to, particles containing crosslinked or uncrosslinked organic materials such as acrylic resin, styrene resin, urethane resin, melamine resin, benzoguanamine resin, epoxy resin, or silicone resin. 【0133】 The uneven structure formed in the resin layer or the content of the particles is not particularly limited. The shape of the uneven structure and the content of the particles may be adjusted, for example, in the case of an AG layer, so that the haze of the resin layer is about 5% to 15%, 7% to 13%, or about 10%, and in the case of an SG layer, so that the haze is about 1% to 3%. The haze may be measured using a hazemeter such as the HR-100 or HM-150 from sepoong, according to the manufacturer's manual. 【0134】 Low-reflection layers, such as AR layers and LR layers, may be formed by coating with a low-refractive index material. Various low-refractive index materials capable of forming low-reflection layers are known, and all of them may be appropriately selected and used for the optical element. The low-reflection layer may be formed by coating with a low-refractive index material so that its reflectivity is about 1% or less. 【0135】 For the formation of the surface treatment layer, also refer to Korean published patents No. 2007-0101001, No. 2011-0095464, No. 2011-0095004, No. 2011-0095820, No. 2000-0019116, No. 2000-0009647, No. 2000-0018983, No. 2003-0068335, No. 2002-0 Publicly known materials such as No. 066505, No. 2002-0008267, No. 2001-0111362, No. 2004-0083916, No. 2004-0085484, No. 2008-0005722, No. 2008-0063107, No. 2008-0101801, or No. 2009-0049557 may also be used. 【0136】 The surface treatment layer may be formed alone or in combination of two or more layers. An example of a combination is to first form a high-hardness layer on the surface of the substrate layer, and then form a low-reflectance layer on that surface. 【0137】 A liquid crystal display (LCD) according to one example of this application may include a liquid crystal panel, and the aforementioned optical elements may be attached to one or both sides of the liquid crystal panel. 【0138】 The types of liquid crystal panels included in a liquid crystal display device are not particularly limited. For example, without being limited by type, any known liquid crystal panels may be applied, including various manual matrix systems such as TN (Twisted Neumatic), STN (SuperTwisted Neumatic), F (ferroelectric), and PD (polymer dispersed LCD), various active matrix systems including two-terminal and three-terminal types, and lateral field-type (IPS mode) panels and vertical alignment type (VA mode) panels. Furthermore, the types of other components included in the liquid crystal display device and their manufacturing methods are not particularly limited, and common configurations in this field may be adopted and used without restriction. [Effects of the Invention] 【0139】 This application may provide a curable composition capable of forming a cured product having appropriate release strength and residual adhesion. 【0140】 Furthermore, this application may provide a curable composition that allows an acrylic composition forming an adhesive layer to be cured without a curing process using heat or energy rays. [Modes for carrying out the invention] 【0141】 The present application will be described below through examples and comparative examples, but the scope of this application is not limited to the following. 【0142】 <Manufacturing of curable compositions> Example 1. The compound represented by the following chemical formula 1A (KS-847H from Shin-etsu Silicon Co., Ltd.) is used as the first polyorganosiloxane component, and the weight-average molecular weight (M) of the first polyorganosiloxane component is...w The concentration was in the range of approximately 300,000 to 400,000 g / mol. 【0143】 [Chemical formula 1A] [ka] 【0144】 In chemical formula 1A, m is approximately 1,000 to 2,000, and n is approximately 5 to 20. 【0145】 As the second polyorganosiloxane component, the compound represented by the following chemical formula 2A (Shin-Etsu Silicon's X-92-122) is used, and the weight-average molecular weight (M) of the second polyorganosiloxane component is determined. w The concentration was in the range of approximately 8,000 to 12,000 g / mol. 【0146】 [Chemical formula 2A] [ka] 【0147】 In chemical formula 2A, a is approximately 25-45, and b is approximately 25-45. 【0148】 A curable composition was prepared by adding the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, from Sigma-Aldrich Co., Ltd.) in a weight ratio of 5:0.1:0.15:2 (PS1:PS2:Ptc:Rc) to an organic solvent and dispersing them in an organic solvent. 【0149】 The organic solvent used was a mixture of tetrahydrofuran (THF), methyl ethyl ketone (MEK), toluene (T), and n-heptane (H), and was used in a sufficient amount to properly disperse the curable composition. 【0150】 Example 2. In Example 2, a curable composition was prepared by dispersing the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, Sigma-Aldrich Co., Ltd.) used in Example 1 into an organic solvent in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, Sigma-Aldrich Co., Ltd.) were added to the organic solvent in a weight ratio of 5:0.1:0.15:0.04 (PS1:PS2:Ptc:Rc). 【0151】 Example 3. Example 3 was prepared in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, Sigma-Aldrich Co., Ltd.) used in Example 1 were added to the organic solvent in a weight ratio of 5:0.1:0.15:0.2 (PS1:PS2:Ptc:Rc). 【0152】 Example 4. Example 4 was prepared in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, Sigma-Aldrich Co., Ltd.) used in Example 1 were added to the organic solvent in a weight ratio of 5:0.1:0.15:1 (PS1:PS2:Ptc:Rc). 【0153】 Comparative Example 1. Comparative Example 1 was prepared by dispersing a curable composition in an organic solvent in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), and a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.) used in Example 1 were added to the organic solvent in a weight ratio of 5:0.1:0.15 (PS1:PS2:Ptc). 【0154】 Comparative Example 2. Comparative Example 2 was prepared by dispersing a curable composition in an organic solvent in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, iron(III) acetylacetonate, Sigma-Aldrich Co., Ltd.) used in Example 1 were added to the organic solvent in a weight ratio of 5:0.1:0.15:5 (PS1:PS2:Ptc:Rc). 【0155】 Example 5. Example 5 was prepared by dispersing a curable composition in an organic solvent in the same manner as in Example 1, except that the first polyorganosiloxane component (PS1), the second polyorganosiloxane component (PS2), a platinum catalyst (Ptc, PL-50L from Shin-Etsu Silicone Co., Ltd.), and a redox catalyst (Rc, cobalt(III) naphthenate) used in Example 1 were added to an organic solvent in a weight ratio of 5:0.1:0.15:2 (PS1:PS2:Ptc:Rc). 【0156】 <Manufacturing of protective films> Protective films were manufactured using the curable compositions produced in Examples 1-5 and Comparative Examples 1 and 2. 【0157】 Each curable composition prepared in Examples 1-5 and Comparative Examples 1 and 2 was applied to one surface of each base film, and cured at 150°C for 3 minutes to form a release layer on the base film. At this time, the thickness of the release layer was about 50-80 nm, and the base film used was a PET (polyethylene terephthalate) film with a thickness of about 50 μm. 【0158】 Subsequently, an acrylic composition was applied to the release layer to a thickness of approximately 20-30 μm, and the acrylic composition was cured to produce a protective film with an adhesive layer. At this time, either acrylic composition A or acrylic composition B was used. 【0159】 Acrylic composition A was produced by mixing 2-ethylhexyl acrylate (2-EHA) and hydroxyethyl acrylate (HEA) in a weight ratio of 6:4 (2-EHA:HEA), then polymerizing the resulting acrylic polymer component (AP), mixing hydroxyethyl acrylate (HEA) and butyl acrylate (BA) in a weight ratio of 3:1 (HEA:BA) to produce an acrylic monomer component (AM), and mixing the curing agent 1,6-hexanediol diacrylate (HDDA) in a weight ratio of 10:85:1 (AP:AM:HDDA). To this mixture, an initiator (cumene hydroperoxide, CHP) was added at a weight of approximately 1 part by weight relative to the total weight of the mixture, and a reducing agent (N,N-dimethyl-p-toluidine, DMPT) was added at a weight of approximately 0.6 parts by weight relative to the total weight of the mixture. 【0160】 Furthermore, the acrylic composition B is a mixture obtained by mixing 2-ethylhexyl acrylate (2-EHA) and hydroxyethyl acrylate (HEA) in a weight ratio of 6:4 (2-EHA:HEA), then polymerizing the resulting acrylic polymer component (AP), mixing hydroxyethyl acrylate (HEA) and glycidyl methacrylate (GMA) in a weight ratio of 3:1 (HEA:GMA), and then mixing the resulting acrylic monomer component (AM) and a curing agent, urethane acrylate curing agent (SHIN-A T&C., SUO-1000), in a weight ratio of 10:85:5 (AP:AM:SUO-1000), to which an initiator (methyl ethyl ketone peroxide) is added. It was produced by adding MEKP) in approximately 2 parts by weight relative to the total weight of the mixture, and a reducing agent (N,N-dimethyl-p-toluidine, DMPT) in approximately 0.6 parts by weight relative to the total weight of the mixture. 【0161】 Table 1 below shows examples of protective films using the curable composition described above. Here, the curable composition becomes the release layer of the protective film, and the acrylic composition becomes the adhesive layer of the protective film. 【0162】 [Table 1] 【0163】 <Physical property measurement method> 1. Method for measuring the ratio of unreacted material content (TML, total mass loss) (1) 25℃ curing conditions When manufacturing the protective film, the acrylic composition applied to the release layer was left at 25°C for 12 or 20 hours to form an adhesive layer. A portion of the formed adhesive layer was appropriately cut, and a PET (polyethyleneterephtalate) film was attached to both sides of the cut adhesive layer to produce a measurement sample. 【0164】 The weight (W) of the aforementioned measurement sample A The weight (W) of the sample was measured and left in a 150°C oven for 1 hour. B The following was measured. Subsequently, the unreacted material content (T1) was measured using the general formula 2 below. 【0165】 [General formula 2] T1 = 100 × (W A -W B )W A 【0166】 In Examples 6-9 and Comparative Examples 3 and 4, the acrylic composition applied to the release layer was left at 25°C for 12 hours to measure the content of unreacted material (T1). In Example 10 and Comparative Example 5, the acrylic composition applied to the release layer was left at 25°C for 20 hours to measure the content of unreacted material (T1). 【0167】 (2) 50℃ curing conditions When manufacturing the protective film, the acrylic composition applied to the release layer was left at 25°C for 20 hours to form an adhesive layer. A portion of the formed adhesive layer was appropriately cut, and a PET (polyethyleneterephtalate) film was attached to both sides of the cut adhesive layer to prepare a measurement sample. 【0168】 The weight (W) of the aforementioned measurement sample C The weight (W) of the sample was measured and left in a 150°C oven for 1 hour. D The following was measured. Subsequently, the unreacted material content (T2) was measured using the general formula 3 below. 【0169】 [General formula 3] T2 = 100 × (W C -W D )W C 【0170】 The results for this are shown in Tables 2 and 3 below. 【0171】 [Table 2] 【0172】 [Table 3] 【0173】 2. Method for measuring release force and residual adhesion rate A standard tape (TESA, TESA7475) having a PET (polyethylene terephthalate) interface was laminated onto the adhesive layer of the manufactured protective film, stored at 70°C for approximately 24 hours, and then, using a physical property measuring device (Cheminstruments, AR-1000), the standard tape was peeled off at 25°C at a peeling angle of 180 degrees and a peeling speed of 0.3 m / min, while measuring the release force (A i The release force (A) measured here was measured. i The results are summarized in Table 4 below. 【0174】 Furthermore, after measuring the release force, a standard tape (TESA, TESA7475) having a PET (polyethylene terephthalate) interface was laminated onto the adhesive layer, stored at 70°C for approximately 24 hours, and then, using a physical property measuring device (Cheminstruments, AR-1000), the standard tape was peeled off at 25°C at a peeling angle of 180 degrees and a peeling speed of 0.3 m / min, while measuring the post-release force (A f ) was measured. 【0175】 The residual adhesion rate was measured using the following general formula 1. 【0176】 [General formula 1] Residual adhesion rate (A d )=A f / A i ×100(%) 【0177】 In general formula 1, A i This is the aforementioned release force (A i ) means A f This is the post-release force (A) mentioned above. f ) means. 【0178】 The results for this are shown in Table 4 below. 【0179】 [Table 4]

Claims

[Claim 1] It contains a polyorganosiloxane component and a redox catalyst. The polyorganosiloxane component is a curable composition comprising a first polyorganosiloxane component represented by the following chemical formula 1 and a second polyorganosiloxane component represented by the following chemical formula 2, The redox catalyst is iron(III) acetylacetonate, and is included in an amount of 0.01 to 80 parts by weight per 100 parts by weight of the polyorganosiloxane component. The curable composition cures the acrylic composition applied to the cured product of the curable composition without irradiation with heat or energy rays. The acrylic composition comprises an acrylic compound, the acrylic compound comprising an alkyl group-containing (meth)acrylate and a hydroxyl group-containing (meth)acrylate, The cured product produced using the aforementioned acrylic composition, which includes an acrylic polymer component (AP) obtained by polymerizing 2-ethylhexyl acrylate (2-EHA) and hydroxyethyl acrylate (HEA) in a weight ratio of 6:4 (2-EHA:HEA), and an acrylic monomer component (AM) obtained by mixing hydroxyethyl acrylate (HEA) and butyl acrylate (BA) in a weight ratio of 3:1 (HEA:BA), was measured for the unreacted content (T) according to the following general formula 2. １ The following conditions must be met: ) 60% or less, and the 25°C release force measured at the PET film interface with a peel angle of 180 degrees and a peel speed of 0.3 m / min is 50 gf / inch (19.3 kg / s). ２ ) The following conditions must be met, A curable composition used in the manufacture of a protective film, wherein the curable composition is applied to a base film, the curable composition is cured to form a release layer on the base film, the acrylic composition is applied to the release layer, and the acrylic composition is cured to form an adhesive layer. [Chemical formula 1] 【Chemistry 1】 In chemical formula 1, R １ , R ７ and R １０ These are, independently, an alkenyl group, an isocyanate group, or an amine group having 2 to 20 carbon atoms. R ２ , R ３ , R ４ , R ５ , R ６ , R ８ and R ９ are each independently an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an isocyanate group or an amine group, m and n are independently numbers in the range of 1 to 10,000. [Chemical formula 2] 【Chemistry 2】 In chemical formula 2, R １１ ~R １９ Each of these is an alkyl group having 1 to 20 carbon atoms, a and b are each independently numbers in the range of 1 to 10,000. [General formula 2] T １ =100×(W Ａ -W Ｂ ) / W Ａ In general formula 2, W Ａ W is the initial weight of the cured product obtained by curing the acrylic composition at 25°C for 12 or 20 hours. Ｂ This refers to the post-curing weight of the acrylic composition after storing the cured acrylic composition, whose initial weight was measured, in an oven at 150°C for 1 hour. [Claim 2] The first polyorganosiloxane component is contained in an amount of 70% by weight or more relative to the total weight of the polyorganosiloxane components, and the first polyorganosiloxane component has a weight-average molecular weight (M) in the range of 100,000 to 1,000,000 g / mol. ｗ The curable composition according to claim 1, having ) [Claim 3] The second polyorganosiloxane component has a weight-average molecular weight (M) in the range of 1,000 to 50,000 g / mol. ｗ The curable composition according to claim 1, having ) [Claim 4] The curable composition according to claim 1, further comprising a platinum catalyst. [Claim 5] The residual adhesion ratio (A) of the following general formula 1, measured for a cured product produced using an acrylic composition comprising an acrylic polymer component (AP) obtained by polymerizing 2-ethylhexyl acrylate (2-EHA) and hydroxyethyl acrylate (HEA) in a weight ratio of 6:4 (2-EHA:HEA), and an acrylic monomer component (AM) obtained by mixing hydroxyethyl acrylate (HEA) and butyl acrylate (BA) in a weight ratio of 3:1 (HEA:BA), is measured for a cured product produced using the acrylic composition. ｄ The curable composition according to claim 1, wherein ) is 80% or more. [General formula 1] Residual adhesion rate (A) ｄ ) = A ｆ / A ｉ ×100 (%) In general formula 1, A ｉ This is the 25°C release force of the cured acrylic composition measured at the interface of a PET (polyethylene terephthalate) film with a peel angle of 180 degrees and a peel speed of 0.3 m / min, and A ｆ A ｉ After measuring the acrylic composition, the cured product was again attached to the interface of the PET film, and the 25°C release force was measured at a peel angle of 180 degrees and a peel speed of 0.3 m / min. [Claim 6] It comprises a base film, an adhesive layer, and a release layer. The release layer is a protective film comprising a cured product of the curable composition described in claim 1. [Claim 7] An optical element having the protective film described in claim 6 attached to one or both sides. [Claim 8] A liquid crystal display device in which the optical element described in claim 7 is attached to one or both sides of a liquid crystal panel.

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