KR101851784B1 - Composition for window film, flexible window film prepared using the same and display apparatus comprising the same - Google Patents

Composition for window film, flexible window film prepared using the same and display apparatus comprising the same Download PDF

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KR101851784B1
KR101851784B1 KR1020150135930A KR20150135930A KR101851784B1 KR 101851784 B1 KR101851784 B1 KR 101851784B1 KR 1020150135930 A KR1020150135930 A KR 1020150135930A KR 20150135930 A KR20150135930 A KR 20150135930A KR 101851784 B1 KR101851784 B1 KR 101851784B1
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window film
flexible
group
display device
composition
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KR20170036974A (en
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김민혜
강경구
박지환
우창수
임지선
장승우
한동일
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삼성에스디아이 주식회사
삼성전자주식회사
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    • C—CHEMISTRY; METALLURGY
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED

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Abstract

There is provided a composition for a window film comprising a siloxane resin, a crosslinking agent and an initiator, and a flexible window film formed therefrom and a flexible display device including the composition.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for a window film, a flexible window film formed therefrom, and a display device including the window film. BACKGROUND OF THE INVENTION 1. Field of the Invention [0002]

The present invention relates to a composition for a window film, a flexible window film formed therefrom, and a display device comprising the same.

In recent years, a flexible display device having flexibility capable of being folded and unfolded while replacing a glass substrate or a hardened substrate with a film in a display device has been developed. The flexible display device is thin, light and strong against impact, and it can be folded and unfolded, so that it can be manufactured in various forms.

The flexible display device should have flexibility not only in the substrate but also in various elements included in the device. Since the window film is located at the outermost portion of the display device, it should have good flexibility, hardness and appearance. The window film is produced by coating the substrate layer with a composition for a window film and curing, so curling may occur.

The background art of the present invention is disclosed in Japanese Laid-Open Patent Application No. 2007-176542.

A problem to be solved by the present invention is to provide a composition for a window film capable of realizing a flexible window film excellent in hardness and flexibility.

Another object of the present invention is to provide a composition for a window film capable of realizing a flexible window film having a low curling and excellent appearance.

Another object of the present invention is to provide a flexible window film having excellent hardness, flexibility and appearance and low curling and a display device including the flexible window film.

The composition for a window film of the present invention may include a siloxane resin having the following formula (1), a crosslinking agent and an initiator:

≪ Formula 1 >

(R 1 SiO 3/2 ) x (R 2 SiO 3/2 ) y (R 3 SiO 3/2 ) z

(In Formula 1, R 1, R 2 and R 3 are as defined in the following detailed description of invention, 0.7 <x <1, 0 <y <1, 0 <z <1, 0 <y + z <0.3 , x + y + z = 1).

The flexible window film of the present invention comprises a substrate layer and a coating layer formed on the substrate layer, and the coating layer may be formed of the composition for the window film.

The display device of the present invention may include the flexible window film.

The present invention provides a composition for a window film capable of realizing a flexible window film excellent in hardness and flexibility.

The present invention provides a composition for a window film capable of realizing a flexible window film having a low curling and excellent appearance.

The present invention provides a flexible window film having excellent hardness, flexibility, appearance, and curling, and a display device including the flexible window film.

1 is a cross-sectional view of a flexible window film according to an embodiment of the present invention.
2 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.
3 is a cross-sectional view of a flexible display device according to an embodiment of the present invention.
4 is a cross-sectional view according to an embodiment of the display unit of FIG.
5 is a cross-sectional view of a flexible display device according to another embodiment of the present invention.
6 is a cross-sectional view of a flexible display device according to another embodiment of the present invention.
7 is a schematic diagram of curl measurement in this specification.

The present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that the terms "upper" and "lower" are defined with reference to the drawings, wherein "upper" may be changed to "lower", "lower" What is referred to as "on" may include not only superposition, but also intervening other structures in the middle. On the other hand, what is referred to as "directly on" or "directly above"

In the present specification, "pencil hardness" is measured by a JIS K5400 method using a pencil hardness meter (Heidon) for the coating layer of the window film. In the pencil hardness measurement, a pencil was used from Mitsubishi's 6B to 9H pencil. The load of the pencil on the coating layer was 1 kg, the angle of drawing the pencil was 45 DEG, and the drawing speed of the pencil was 60 mm / min. 5 times, and when a scratch occurs more than once, it is measured by using a pencil of the pencil hardness level, and when it is 5 times of the evaluation, it is the maximum pencil hardness value when there is no scratch.

In the present specification, "radius of curvature" means that a window film specimen is wound around a curvature radius test JIG (CFT-200R, COVOTECH) and held for 5 seconds to loosen the specimen and visually confirm whether or not cracks have occurred in the specimen This means the minimum radius of the JIG that did not crack. The radius of curvature in the compression direction is measured when the coating layer in the window film touches the JIG surface. The radius of curvature in the tensile direction is measured when the base layer of the window film touches the JIG. The thickness of the window film test piece may be 50 탆 to 300 탆.

7, a window film 1 having a base layer thickness of 50 탆 and a coating layer thickness of 50 탆 is cut into a width x length (10 cm x 10 cm) The maximum height H from the bottom surface 2 to the edge portion of the window film 1 is measured when it is placed on the bottom surface 2 facing the surface 2 and left at 25 캜 and 50% This is the average value obtained.

As used herein, unless specifically stated otherwise, at least one hydrogen atom of the functional group may be replaced by a hydroxyl group, an unsubstituted C1 to C10 alkyl group, a C1 to C10 alkoxy group, a C3 to C10 cycloalkyl group, Means a C 1 to C 20 arylalkyl group, a C 7 to C 20 arylalkyl group, a benzophenone group, a C 6 to C 20 aryl group substituted with a C 1 to C 10 alkyl group, or a C 1 to C 10 alkyl group substituted with a C 1 to C 10 alkoxy group do.

As used herein, "cycloaliphatic epoxy group" means an epoxidized C5 to C20 cycloalkyl group. In the present specification, the "alicyclic epoxy group-containing functional group" means a C1 to C12 alkyl group or a C5 to C20 cycloalkyl group having at least one epoxidized C5 to C20 cycloalkyl group.

In the present specification, "(meth) acrylate" means acrylate (CH 2 ═CH-COO-) and / or methacrylate (CH 2 ═C (CH 3 ) -COO-).

As used herein, the term "(meth) acrylate group-containing functional group" means a C1 to C12 alkyl group, a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a C7 to C20 &Lt; / RTI &gt;

As used herein, the "hydroxyl group-containing functional group" means a C1 to C12 alkyl group, a C3 to C12 cycloalkyl group, a C6 to C20 aryl group, or a C7 to C20 arylalkyl group having at least one hydroxyl group (-OH) .

As used herein, "halogen" means fluorine, chlorine, bromine or iodine.

Hereinafter, a composition for a window film according to an embodiment of the present invention will be described.

The composition for a window film according to an embodiment of the present invention may include a siloxane resin having the following formula (1), a crosslinking agent and an initiator:

&Lt; Formula 1 >

(R 1 SiO 3/2 ) x (R 2 SiO 3/2 ) y (R 3 SiO 3/2 ) z

R 2 is a (meth) acrylate group or a (meth) acrylate group-containing functional group, and R 3 may be a hydroxyl group or a hydroxyl group-containing functional group. In the formula 1, R 1 is a functional group containing an alicyclic epoxy group or alicyclic epoxy group, .

The composition for a window film according to this embodiment includes a siloxane resin containing the formula (1), thereby increasing the hardness and flexibility of the window film, lowering the curl and improving the appearance. In addition, the siloxane resin containing the formula (1) includes (R 1 SiO 3/2 ) , (R 2 SiO 3/2 ) (R 3 SiO 3/2 ) ratio, it is possible to lower the curling of the window film and to control the hardness and flexibility. The siloxane resin containing the formula (1) may be contained in at least one composition for a window film.

R 1 in the formula (1) provides a window film with a crosslinking property to a composition for a window film, and a window film having high flexibility, low curling and good appearance together with R 2 and R 3 in the formula (1) can be realized. Specifically, R 1 is (3,4-epoxycyclohexyl) methyl group, (3,4-epoxycyclohexyl) ethyl group, (3,4-epoxycyclohexyl) propyl) group and the like.

R 2 and R 3 in the formula (1) can improve the appearance and hardness of the window film. Specifically, R 2 may be a 3- (meth) acryloxypropyl group, a 2- (meth) acryloxyethyl group, or the like. Specifically, R 3 may be a 3-hydroxypropyl group, a 3-hydroxyethyl group, or the like.

In the formula 1, 0.7 <x <1, 0 <y <1, 0 <z <1, 0 <y + z <0.3, x + y + z = 1. More specifically, 0.75? X? 0.99, 0.01? Y + z? 0.25, more specifically 0.85? X? 0.97, 0.03? Y + z? 0.15, more specifically 0.85? X? 0.15. For example, 0.01? Y? 0.07 may be satisfied. In this range, the hardness and flexibility of the window film can be high, the curling can be low, and the appearance can be good.

Specifically, the siloxane resin containing the formula (1) may be represented by the following formula (1-1):

&Lt; Formula 1-1 >

(EcSiO3 / 2 ) x (MpSiO3 / 2 ) y (HpSiO3 / 2 ) z

(Wherein, Ec is a 2- (3,4-epoxycyclohexyl) ethyl group, Mp is a 3-methacryloxypropyl group, Hp is a 3-hydroxypropyl group, 0.7 <x < y <1, 0 <z <1, 0 <y + z <0.3, x + y + z = 1).

The siloxane resin having the formula (1) may have a weight average molecular weight of 4,000 to 100,000, specifically, 4,500 to 10,000. Within the above range, the production of the siloxane resin is easy, and the hardness and flexibility can be excellent. The siloxane resin containing the formula (1) may have a polydispersity index (PDI) of 1.0 to 3.0, specifically 1.5 to 2.5. In the above range, the composition for a window film may have good coating properties and the coating properties may be stable. The siloxane resin containing the formula (1) may have an epoxy equivalent of 0.1 mol / 100 g to 1.0 mol / 100 g, specifically 0.3 mol / 100 g to 0.7 mol / 100 g. In the above range, the coating property of the window film may be stable, and the hardness and flexibility may be maintained.

The crosslinking agent may contain a crosslinkable functional group to increase the hardness of the window film. The crosslinking agent can further increase the flexibility of the window film. Specifically, the crosslinking agent may further include at least one of a non-cyclic aliphatic hydrocarbon group, a cyclic aliphatic hydrocarbon group, an aromatic hydrocarbon group, a hydrogenated aromatic hydrocarbon group, and an oxetane group to further increase the flexibility of the window film.

Specifically, the crosslinking agent may include at least one of a non-cyclic aliphatic epoxy monomer, a cyclic aliphatic epoxy monomer, an aromatic epoxy monomer, a hydrogenated aromatic epoxy monomer, and an oxetane monomer. One or more crosslinking agents may be included.

Non-cyclic aliphatic epoxy monomers include, but are not limited to, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, But are not limited to, neopentylglycol diglycidyl ether, trimethylolpropane triglycidyl ether, polyethyleneglycol diglycidyl ether, glycerin triglycidyl ether, Polypropyleneglycol diglycidyl ether; Polyglycidyl ethers of polyether polyols obtained by adding one or more alkylene oxides to aliphatic polyhydric alcohols such as ethylene glycol, propylene glycol and glycerin; Diglycidyl esters of aliphatic long chain dibasic acids; Monoglycidyl ethers of aliphatic higher alcohols; Glycidyl ethers of higher fatty acids; Epoxidized soybean oil; Butyl stearate; Octyl stearate; Epoxidized linseed oil; Epoxylated polybutadiene, and the like.

The cyclic aliphatic epoxy monomer is a compound having at least one epoxy group in the alicyclic group, and may specifically include an alicyclic epoxy carboxylate, an alicyclic epoxy (meth) acrylate, and the like. More specifically, there may be mentioned (3,4-epoxycyclohexyl) methyl-3 ', 4'-epoxycyclohexyl methyl-3', 4'-epoxycyclohexanecarboxylate, diglycidyl 1 , Diglycidyl 1,2-cyclohexanedicarboxylate, 2- (3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-meta-dioxane (2 - 3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy cyclohexane-metha-dioxane, bis (3,4-epoxycyclohexylmethyl) adipate (3,4-epoxy-6-methylcyclohexylmethyl) adipate, 3,4-epoxy-6-methylcyclohexylmethyl- Epoxy-6'-methylcyclohexylmethyl-3 ', 4'-epoxy-6'-methylcyclohexanecarboxylate), ε-caprolactone-modified 3,4-epoxycyclo Epoxycyclohexylmethyl-3 ', 4'-caprolactone modified 3,4-epoxycyclohexylmethyl-3' , 4'-epoxy-cyclohexanecarboxylate, trimethylcaprolactone modified 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate (trimethylcaprolactone modified 3,4-epoxycyclohexylmethyl-3' ), β-methyl-δ-valerolactone modified 3,4-epoxycyclohexylmethyl-3'4, '-epoxycyclohexylmethyl-3' , 4'-epoxycyclohexanecarboxylate, 1,4-cyclohexanedimethanol bis (3,4-epoxycyclohexanecarboxylate), 1,4-cyclohexanedimethanol bis (3,4-epoxycyclohexanecarboxylate) Ethylenebis (3,4-epoxycyclohexanecarboxylate)), 3, 4-epoxycyclohexanecarboxylate), ethylenebis (3,4-epoxycyclohexanecarboxylate) Epoxycyclohexylmethyl (meth) acrylate, bis (3,4-epoxycyclohexyl (meth) acrylate, Methyl), and the adipate (bis (3,4-epoxycyclohexylmethyl) adipate), 4- vinyl cyclohexyl Sendai-oxide (4-vinylcyclohexen dioxide), vinylcyclohexene mono-oxide (vinylcyclohexen monoxide) and the like.

Aromatic epoxy monomers include bisphenol-type epoxy resins such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, diglycidyl ether of bisphenol S and the like; Novolak type epoxy resins such as phenol novolak epoxy resin, cresol novolak epoxy resin, and hydroxybenzaldehyde phenol novolak epoxy resin; A polyfunctional epoxy resin such as glycidyl ether of tetrahydroxyphenylmethane, glycidyl ether of tetrahydroxybenzophenone, epoxidized polyvinyl phenol, and the like.

The hydrogenated aromatic epoxy monomer means a monomer obtained by selectively hydrogenating an aromatic epoxy monomer under a pressure in the presence of a catalyst. The aromatic epoxy monomer for the hydrogenated aromatic epoxy monomer may comprise the aromatic epoxy monomer described above.

Oxetane monomers include 3-methyloxetane, 2-methyloxetane, 2-ethylhexyloxetane, 3-oxethanol, 2- 2-methyleneoxetane, 3,3-oxetanedimethanethiol, 4- (3-methyloxetan-3-yl) benzonitrile, 3-yl) benzonitrile, N- (2,2-dimethylpropyl) -3-methyl-3-oxetanemethaneamine, N- (1,2-dimethylbutyl) -3-methyl-3-oxetanemethaneamine, (3-ethyloxetan-3-yl) Methyl (meth) acrylate, 4 - [(3-ethyloxetan-3-yl) methoxy] butan- Ethyloxetan-3-yl) methoxy] butan-1-ol, 3-ethyl-3-hydroxymethyloxetane, xylenebisoxetane, 3- [ 3 - [[(3-ethyloxetan-3-yl)] methoxy] methyl] oxetane hyl] oxetane, but is not limited thereto.

The crosslinking agent may be contained in an amount of 0.1 to 50 parts by weight, specifically 1 to 30 parts by weight, more specifically 5 to 20 parts by weight, based on 100 parts by weight of the siloxane resin containing the structural formula (1). The flexibility and hardness of the window film may be increased in the above range.

The initiator can cure the siloxane resin and the cross-linking agent containing the formula (1). The initiator may comprise at least one of a light-ion initiator, a photo-radical initiator. The initiators may be used alone or in combination of two or more.

The Gwangyang ionic initiator may be any of those conventionally known to those skilled in the art. Specifically, the photocationic initiator may include one or more onium salts including cations and anions. Specifically, the cation is at least one selected from the group consisting of diphenyliodonium, 4-methoxydiphenyliodonium, bis (4-methylphenyl) iodonium, bis (4- Bis (4-tert-butylphenyl) iodonium, bis (dodecylphenyl) iodonium and 4-methylphenyl [ Diaryl iodonium such as 4-methylphenyl [(4- (2-methylpropyl) phenyl) iodonium], triphenylsulfonium, diphenyl-4- thiophenylphenylsulfonium and diphenyl-4-thiophenoxyphenylsulfonium; bis [4- (diphenylsulfonyl) phenyl] sulfide (bis [4- diphenylsulfonio) phenyl] sulfide). Specifically, the anion is phosphate (PF 6 -) hexafluoropropane, borates (BF 4 -) tetrafluoroborate, antimonate hexafluorophosphate (SbF 6 -), are Senate hexafluorophosphate (AsF 6 -), hexamethylene And chlorantimonate (SbCl 6 - ).

As the photo-radical initiator, those conventionally known to those skilled in the art can be used. Specifically, the photo radical initiator may include at least one of a thioxanthone system, a phosphorus system, a triazine system, an acetophenone system, a benzophenone system, a benzoin system, and an oxime system.

The initiator may be included in an amount of 0.01 part by weight to 20 parts by weight, specifically 1 part by weight to 10 parts by weight, based on 100 parts by weight of the siloxane resin containing the formula (1). Within this range, the siloxane resin can be sufficiently cured, and the remaining amount of the initiator remains, thereby preventing the transparency of the window film from deteriorating.

The composition for a window film according to this embodiment may further include nanoparticles.

Nanoparticles can further increase the hardness of the window film. The nanoparticles may include, but are not limited to, one or more of silica, aluminum oxide, zirconium oxide, and titanium oxide. The nanoparticles may be surface treated with some or all of the surface with a silicone compound for mixing with the siloxane resin. Nanoparticles are not limited in shape and size. Specifically, the nanoparticles may include spherical, plate-like, amorphous, etc. particles. The nanoparticles may have an average particle size of 1 nm to 200 nm, specifically 10 nm to 50 nm. The hardness of the window film can be increased without affecting the surface roughness and transparency of the window film in the above range. The nanoparticles may be contained in an amount of 0.1 part by weight to 60 parts by weight, specifically 10 parts by weight to 50 parts by weight, based on 100 parts by weight of the siloxane resin containing the formula (1). The hardness of the window film can be increased without affecting the surface roughness and transparency of the window film in the above range.

The composition for a window film according to this embodiment may further include an additive. The additive may provide additional functionality to the window film. The additive may include an additive typically added to the window film. Specifically, the additive may include at least one of a UV absorber, a reaction inhibitor, an adhesion improver, a thixotropic agent, a conductivity imparting agent, a colorant adjusting agent, a stabilizer, an antistatic agent, an antioxidant, Do not. The reaction inhibitor may comprise ethynylcyclohexane. The adhesion improver may include a silane compound having an epoxy or alkoxysilyl group. The thixotropic agent may include pyrous silica and the like. The conductivity-imparting agent may include a metal powder such as silver, copper aluminum and the like. The colorant-adjusting agent may include a pigment, a dye, and the like. The UV absorber can increase the light reliability of the window film. The UV absorbers can be conventional absorbents known to those skilled in the art. Specifically, the UV absorber may include, but is not limited to, one or more UV absorbers based on triazine, benzimidazole, benzophenone, and benzotriazole. The additive may be included in an amount of 0.01 to 5 parts by weight, specifically 0.1 to 2.5 parts by weight based on 100 parts by weight of the siloxane resin containing the formula (1). In this range, the hardness and flexibility of the window film can be improved and the additive effect can be realized.

The composition for a window film according to this embodiment may further include a solvent to facilitate coating, coating or processability. The solvent may include, but is not limited to, one or more of methylethylketone, methylisobutylketone, and propyleneglycolmonomethyletheracetate.

The composition for a window film according to this embodiment may have a viscosity of 50 cP to 2000 cP at 25 ° C. In this range, it is easy to form the window film.

Hereinafter, the production method of one embodiment of the siloxane resin containing the formula (1) will be described in detail.

The siloxane resin comprising formula (1) may be formed by hydrolysis and condensation of a monomer mixture comprising a first silicone monomer and a second silicone monomer. The second silicone monomer may be hydrolyzed and condensed to provide R &lt; 2 &gt; and R &lt; 3 &gt; The first silicone monomer may be contained in an amount of more than 70 mol%, specifically less than 100 mol%, specifically, 80 mol% to 99 mol% in the monomer mixture. Within this range, the hardness and flexibility of the window film may be high and the curling may be low. The second silicone monomer may be contained in an amount of more than 0 mol%, specifically less than 30 mol%, specifically 1 mol% to 20 mol% in the monomer mixture. Within this range, the hardness and flexibility of the window film can be high and the curling can be low, and the siloxane resin of the formula (1) can be provided. The first silicone monomer may be a silane compound represented by the following formula (2). The second silicone monomer may be a silane compound represented by the following formula (3). These may be used alone or in combination of two or more:

(2)

Figure 112015093550013-pat00001

(Wherein R 1 is as defined in Formula 1, and R 4 , R 5, and R 6 are each independently a halogen, a hydroxyl group, or a C 1 to C 10 alkoxy group).

(3)

Figure 112015093550013-pat00002

(Wherein R 2 is as defined in Formula 1, and R 7 , R 8, and R 9 are each independently a halogen, a hydroxyl group, or a C 1 to C 10 alkoxy group).

Specifically, the first silicone monomer is 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, But not limited to, one or more of 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane.

Specifically, the second silicone monomer is selected from the group consisting of 3- (meth) acryloxypropyltrimethoxysilane, 2- (meth) acryloxyethyltrimethoxysilane, But is not limited thereto.

The hydrolysis and condensation reaction of the monomer mixture can be carried out according to a conventional method for producing a siloxane resin. Hydrolysis can include mixing the first silicone monomer, the second silicone monomer, and reacting in a mixture of water and a predetermined base. Specifically, the base may be specifically a strong base such as NaOH, KOH, or the like. The base may be contained in an amount of less than 2 mol%, for example, 0.01 mol% to 1 mol%, based on the silicone monomer mixture. Within the above range, a siloxane resin containing the formula (1) can be prepared. The hydrolysis and condensation reaction can be carried out at 20 ° C to 100 ° C for 10 minutes to 24 hours. Within this range, the efficiency of the hydrolysis and condensation reaction can be increased.

Hereinafter, a flexible window film according to an embodiment of the present invention will be described with reference to FIG. 1 is a cross-sectional view of a flexible window film according to an embodiment of the present invention.

1, a flexible window film 100 according to an exemplary embodiment of the present invention includes a base layer 110 and a coating layer 120, And the like.

The substrate layer 110 supports the flexible window film 100 and the coating layer 120 to increase the mechanical strength of the flexible window film 100. The base layer 110 may be adhered to a display portion, a touch screen panel, or a polarizing plate by an adhesive layer or the like.

The substrate layer 110 may be formed of an optically transparent and flexible resin. For example, the resin includes a polyester resin including a polyethylene terephthalate, a polyethylene naphthalate, a polybutylene terephthalate, a polybutylene naphthalate, etc., a polycarbonate resin, a polyimide resin, a polystyrene resin, polymethylmethacrylate (Meth) acrylate resin. &Lt; / RTI &gt; The resin may be contained in the base layer 110 alone or in combination.

The base layer 110 may have a thickness of 10 占 퐉 to 200 占 퐉, specifically, 20 占 퐉 to 150 占 퐉, more specifically, 50 占 퐉 to 100 占 퐉. Can be used in the flexible window film in the above range.

The coating layer 120 is formed on the base layer 110 to protect the base layer 110, the display portion, the touch screen panel or the polarizing plate, and has high flexibility and high hardness, so that it can be used in a flexible display device.

The thickness of the coating layer 120 may be 5 占 퐉 to 100 占 퐉, specifically 10 占 퐉 to 80 占 퐉. Can be used in the flexible window film in the above range.

Although not shown in FIG. 1, a functional surface layer such as an antireflection layer, an antiglare layer, or a hard coating layer may be further formed on the other surface of the coating layer 120 to provide additional functions to the flexible window film. 1, a coating layer 120 may be further formed on the other surface of the substrate layer 110. [

The flexible window film 100 is optically transparent and can be used in a transparent display device. Specifically, the flexible window film 100 can have a light transmittance of 88% or more and specifically 88% to 100% in a visible light region specifically at a wavelength of 400 nm to 800 nm. It can be used as a flexible window film in the above range.

The flexible window film 100 may have a pencil hardness of 6H or more, a radius of curvature of 5.0 mm or less, and a curl of 10 mm or less. Within this range, the film can be used as a flexible window film with good hardness, flexibility, and light fastness reliability and low curling. Specifically, the flexible window film 100 may have a pencil hardness of 6H to 9H, a radius of curvature of 0.1 mm to 5.0 mm, and a curl of 0.1 mm to 10 mm.

The flexible window film 100 may have a thickness of 50 mu m to 300 mu m. It can be used as a flexible window film in the above range.

The flexible window film 100 can be manufactured by a method of manufacturing a flexible window film including coating and curing a composition for a window film according to embodiments of the present invention on a substrate layer 110. [

The method of coating the composition for a window film on the base layer 110 is not particularly limited. For example, bar coating, spin coating, dip coating, roll coating, flow coating, die coating, and the like. A composition for a window film can be coated on the base layer 110 to a thickness of 5 to 100 mu m. It is possible to secure a desired coating layer within the above range, and to have an excellent effect of hardness, flexibility, and reliability.

Curing is a process of curing the composition for a window film to form a coating layer, which may include at least one of light curing and heat curing. Photocuring may involve irradiation with light amount of 10 mJ / cm 2 to 1000mJ / cm 2 at a wavelength of 400nm or less. Thermal curing may include treating at 40 占 폚 to 200 占 폚 for 1 hour to 30 hours. Within this range, the composition for a window film can be sufficiently cured. For example, it is possible to photo-cure and then thermally cure, resulting in a higher hardness of the coating layer.

The method may further include drying the composition for the window film before coating the composition for the window film on the substrate layer 110 and then curing the composition. By drying and curing, it is possible to prevent the surface roughness of the coating layer from becoming high due to long-time light curing and thermal curing. The drying may be performed at 40 캜 to 200 캜 for 1 minute to 30 hours, but is not limited thereto.

Hereinafter, a flexible window film according to another embodiment of the present invention will be described with reference to FIG. 2 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.

2, the flexible window film 200 according to another embodiment of the present invention includes a substrate layer 110, a coating layer 120 formed on one surface of the substrate layer 110, Layer 130, and the coating layer 120 may be formed of a composition for a window film according to embodiments of the present invention.

The adhesive layer 130 is further formed on the other surface of the base layer 110, so that adhesion between the flexible window film and the touch screen panel, the polarizing plate, or the display portion can be facilitated. Is substantially the same as the flexible window film according to an embodiment of the present invention, except that an adhesive layer is further formed. Hereinafter, only the adhesive layer 130 will be described.

The adhesive layer 130 adheres to a polarizing plate, a touch screen panel, or a display unit that can be disposed under the flexible window film 200, and may be formed of a composition for a pressure-sensitive adhesive layer. Specifically, the adhesive layer 130 may be formed of a composition for a pressure-sensitive adhesive layer including a pressure-sensitive adhesive resin such as a (meth) acrylic resin, a urethane resin, a silicone resin, and an epoxy resin, a curing agent, a photoinitiator and a silane coupling agent.

The (meth) acrylic resin is a (meth) acrylic copolymer having an alkyl group, a hydroxyl group, an aromatic group, a carboxylic acid group, an alicyclic group, a heteroalicyclic group, or the like and may include a conventional (meth) acrylic copolymer. Specifically, a (meth) acrylic monomer having an unsubstituted C1 to C10 alkyl group, a (meth) acrylic monomer having a C1 to C10 alkyl group having at least one hydroxyl group, a (meth) acrylic monomer having an C6 to C20 aromatic group (Meth) acrylic monomer having a carboxylic acid group, a (meth) acrylic monomer having a C3 to C20 alicyclic group, a C3 to C10 heteroalicyclic group having at least one of nitrogen (N), oxygen (O) (Meth) acryl-based monomer having at least one group selected from the group consisting of (meth) acryl-based monomers.

The curing agent may be a bifunctional (meth) acrylate such as hexanediol diacrylate as a polyfunctional (meth) acrylate; Trifunctional (meth) acrylates of trimethylolpropane tri (meth) acrylate; Tetrafunctional (meth) acrylates such as pentaerythritol tetra (meth) acrylate; Pentafunctional (meth) acrylates such as dipentaerythritol penta (meth) acrylate; (Meth) acrylate such as dipentaerythritol hexa (meth) acrylate, but are not limited thereto.

The photoinitiator may include the above-described photoinitiator as a conventional photoinitiator.

The silane coupling agent may include a silane coupling agent having an epoxy group such as 3-glycidoxypropyltrimethoxysilane and the like.

The composition for the adhesive layer may comprise 100 parts by weight of a (meth) acrylic resin, 0.1 to 30 parts by weight of a curing agent, 0.1 to 10 parts by weight of a photoinitiator, and 0.1 to 20 parts by weight of a silane coupling agent. Within this range, the flexible window film can be adhered well onto the display portion, the touch screen panel or the polarizing plate.

The thickness of the adhesive layer 130 may be 10 占 퐉 to 100 占 퐉. In the above range, the optical element such as the flexible window film and the polarizing plate can be sufficiently adhered.

Hereinafter, a flexible display device according to an embodiment of the present invention will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a cross-sectional view of a flexible display device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view of an exemplary embodiment of the display unit of FIG.

3, the flexible display device 300 according to an exemplary embodiment of the present invention includes a display portion 350a, an adhesive layer 360, a polarizing plate 370, a touch screen panel 380, a flexible window film 390 , And the flexible window film 390 may comprise a flexible window film according to embodiments of the present invention.

The display unit 350a is for driving the flexible display device 300 and may include an optical element including an OLED, an LED, or an LCD device formed on a substrate and a substrate. 4 is a cross-sectional view according to an embodiment of the display unit of FIG. 4, the display portion 350a may include a lower substrate 310, a thin film transistor 316, an organic light emitting diode 315, a planarization layer 314, a protection layer 318, and an insulation layer 317 have.

The lower substrate 310 supports the display portion 350a and the lower substrate 310 may have a thin film transistor 316 and an organic light emitting diode 315 formed thereon. A flexible printed circuit board (FPCB) for driving the touch screen panel 380 may be formed on the lower substrate 310. The flexible printed circuit board may further include a timing controller for driving the organic light emitting diode array, a power supply unit, and the like.

The lower substrate 310 may include a substrate formed of a flexible resin. The lower substrate 310 may include a flexible substrate such as a silicone substrate, a polyimide substrate, a polycarbonate substrate, or a polyacrylate substrate, but is not limited thereto .

A plurality of pixel regions are defined by a plurality of driving wirings (not shown) and sensor wirings (not shown) crossing the display region of the lower substrate 310, and thin film transistors 316 and thin film transistors 316 And an organic light emitting diode (OLED) 315 connected to the organic light emitting diode array. In a non-display area of the lower substrate, a gate driver for applying an electrical signal to the driving wiring may be formed in the form of a gate in panel. The gate-in panel circuit portion may be formed on one side or both sides of the display region.

The thin film transistor 316 may be formed on the lower substrate 310 by controlling a current flowing through the semiconductor by applying an electric field perpendicular thereto. The thin film transistor 316 may include a gate electrode 310a, a gate insulating film 311, a semiconductor layer 312, a source electrode 313a, and a drain electrode 313b. The thin film transistor 316 includes an oxide thin film transistor using an oxide such as indium gallium zinc oxide (IGZO), ZnO, or TiO.sub.2 as the semiconductor layer 312, an organic thin film transistor using an organic material as a semiconductor layer, an amorphous silicon An amorphous silicon thin film transistor to be used, or a polycrystalline silicon thin film transistor using polycrystalline silicon as a semiconductor layer.

The planarization layer 314 may cover the thin film transistor 316 and the circuit portion 310b so that the top surface of the thin film transistor 316 and the circuit portion 310b may be planarized to form the organic light emitting diode 315. [ The planarization layer 314 may be formed of a spin-on-glass (SOG) film, a polyimide-based polymer, a polyacrylic polymer, or the like, but is not limited thereto.

The organic light emitting diode 315 emits light by self-emission, and may include a first electrode 315a, an organic light emitting layer 315b, and a second electrode 315c stacked in that order. The adjacent organic light emitting diodes may be separated through an insulating film 317. [ The organic light emitting diode 315 may include a bottom emission structure in which light generated in the organic emission layer 315b is emitted through the lower substrate or a top emission structure in which light generated in the organic emission layer 315b is emitted upward.

The passivation layer 318 may cover the organic light emitting diode 315 to protect the organic light emitting diode 315. The passivation layer 318 may be formed of an inorganic material such as SiOx, SiNx, SiC, SiON, SiONC, and aC (amorphous carbon) Methacrylate, epoxy-based polymer, imide-based polymer, and the like. Specifically, the protective layer 318 may include an encapsulation layer in which a layer formed of an inorganic material and a layer formed of an organic material are sequentially stacked one or more times.

3, the adhesive layer 360 is formed of a pressure-sensitive adhesive composition comprising a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent to adhere the display portion 350a and the polarizing plate 370 .

The polarizing plate 370 can implement polarizing of the inner light or prevent reflection of the external light to realize the display or to increase the contrast ratio of the display. The polarizing plate may be composed of a polarizer alone. Or the polarizing plate may include a polarizing film and a protective film formed on one or both sides of the polarizing film. Or the polarizing plate may include a polarizer and a protective coating layer formed on one or both sides of the polarizer. The polarizer, the protective film, and the protective coating layer may be conventional ones known to those skilled in the art.

The touch screen panel 380 senses a change in capacitance generated when a conductor such as a human body or a stylus touches, and generates an electrical signal. The display unit 350a can be driven by this signal. The touch screen panel 380 is formed by patterning a flexible conductive conductive material. The touch screen panel 380 may include a first sensor electrode and a second sensor electrode formed between the first sensor electrode and the first sensor electrode. have. The conductor for the touch screen panel 380 may include, but is not limited to, metal nanowires, conductive polymers, carbon nanotubes, and the like.

The flexible window film 390 may be formed at the outermost portion of the flexible display device 300 to protect the display device.

3, an adhesive layer is further formed between the polarizing plate 370 and the touch screen panel 380 and / or between the touch screen panel 380 and the flexible window film 390 to form a polarizing plate, a touch screen panel, a flexible It is possible to strengthen the bonding between the window films. The pressure-sensitive adhesive layer may be formed of a pressure-sensitive adhesive composition comprising a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent. Further, although not shown in FIG. 3, a polarizing plate is further provided under the display unit 350a, so that polarized light can be realized.

Hereinafter, a flexible display device according to another embodiment of the present invention will be described with reference to FIG. 5 is a cross-sectional view of a flexible display device according to another embodiment of the present invention.

5, the flexible display device 400 according to another embodiment of the present invention includes a display portion 350a, a touch screen panel 380, a polarizer 370, and a flexible window film 390, The window film 390 may comprise a flexible window film according to embodiments of the present invention. Except that the touch screen panel 380 is not directly formed on the flexible window film 390 but the touch screen panel 380 is formed below the polarizer 370. In this case, Device. At this time, the touch screen panel 380 may be formed together with the display portion 350a. In this case, since the touch screen panel 380 is formed on the display unit 350a together with the display unit 350a, the thickness of the touch screen panel 380 can be thinner and brighter than that of the flexible display device according to an embodiment of the present invention. In this case, the touch screen panel 380 can be formed by deposition or the like, but is not limited thereto. Although not shown in FIG. 5, a gap between the display portion 350a and the touch screen panel 380 and / or between the touch screen panel 380 and the polarizer 370 and / or between the polarizer 370 and the flexible window film 390 An adhesive layer is further formed, thereby increasing the mechanical strength of the display device. The pressure-sensitive adhesive layer may be formed of a pressure-sensitive adhesive composition comprising a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent. Although not shown in FIG. 5, a polarizing plate is further provided under the display unit 350a to thereby guide polarized light to improve the display image.

Hereinafter, a flexible display device according to another embodiment of the present invention will be described with reference to FIG. 6 is a cross-sectional view of a flexible display device according to another embodiment of the present invention. 6, the flexible display device 500 according to another exemplary embodiment of the present invention includes a display portion 350b, an adhesive layer 360, and a flexible window film 390. The flexible window film 390 includes a flexible window film 390, May comprise a flexible window film according to embodiments of the present invention. Is substantially the same as the flexible display device according to an embodiment of the present invention, except that only the display portion 350b is capable of driving the device and the polarizing plate and the touch screen panel are excluded.

The display portion 350b may include an LCD, an OLED, or an optical element including an LED element formed on the substrate, and the display portion 350b may have a touch screen panel formed therein.

Although the flexible display device has been described above, the flexible display window film of the present embodiments can be used in a non-flexible display device.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example 1

, 90 mol% of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane (KBM-303, Shinetsu) and 10 mol% of 3-methacryloxypropyltrimethoxysilane (KBM-503, Shinetsu) A total of 50 g of the monomer mixture was placed in a 200 ml 2-neck flask. To the monomer mixture, 0.5 mol% of KOH and 2 mol% of water based on the monomer mixture were added to the monomer mixture, and the mixture was stirred at 65 DEG C for 2 hours. The toluene was further placed in the 2-neck flask, washed with water, and the solvent remaining in the distillation apparatus was removed to prepare a siloxane resin represented by the following formula 1-1-1. The weight average molecular weight of the siloxane resin confirmed by gel permeation chromatography was 8,000.

&Lt; Formula 1-1-1-1 &

(EcSiO3 / 2 ) 0.90 (MpSiO3 / 2 ) 0.03 (HpSiO3 / 2 ) 0.07

(In the above formula 1-1-1, Ec is 2- (3,4-epoxycyclohexyl) ethyl group, Mp is a 3-methacryloxypropyl group, and Hp is a 3-hydroxypropyl group.

100 parts by weight of a siloxane resin, 10 parts by weight of a crosslinking agent CY-179 (CIBA), 3 parts by weight of an initiator Irgacure-250 (BASF) and methyl ethyl ketone were added to prepare a composition for a window film having a solid concentration of 70% . The composition for a window film was coated on a polyimide film (Samsung SDI, thickness: 50 μm), dried at 80 ° C. for 5 minutes, irradiated with UV at 1,000 mJ / cm 2 , And heated to produce a window film having a coating layer thickness of 50 mu m.

Example 2

A siloxane resin was prepared in the same manner as in Example 1, except that the siloxane resin was prepared using 0.25 mol% of KOH based on the monomer mixture. A window film was prepared in the same manner as in Example 1 using the siloxane resin.

Examples 3 and 4

A window film was prepared in the same manner as in Example 1, except that the content of silicone monomers was changed as shown in Table 1 below.

Comparative Example 1

A siloxane resin was prepared in the same manner as in Example 1, except that 100 mol% of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane was used as the silicone monomer. A window film was prepared in the same manner as in Example 1 using the siloxane resin.

Comparative Example 2

A siloxane resin was prepared in the same manner as in Example 1, except that 100 mol% of 3-methacryloxypropyltrimethoxysilane was used as the silicone monomer. A window film was prepared in the same manner as in Example 1 using the siloxane resin.

Comparative Example 3

In the same manner as in Example 1 except that 70 mol% of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and 30 mol% of 3-methacryloxypropyltrimethoxysilane were used as silicone monomers, Resin. A window film was prepared in the same manner as in Example 1 using the siloxane resin.

Comparative Example 4

In Example 1, 70 mol% of 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and 30 mol% of 3-methacryloxypropyltrimethoxysilane were used as silicon monomers and 1.0 mol% of KOH was excluded And the siloxane resin was prepared in the same manner. A window film was prepared in the same manner as in Example 1 using the siloxane resin.

The compositions of the composition for a window film of Examples and Comparative Examples are shown in Tables 1 and 2 below. The following properties (1) to (4) of the window films prepared in Examples and Comparative Examples were measured and shown in Tables 1 and 2 below.

1. Pencil hardness: Measured by the JIS K5400 method using a pencil hardness meter (Heidon) for the coating layer of the window film. In the pencil hardness measurement, a pencil was used from Mitsubishi's 6B to 9H pencil. The load of the pencil on the coating layer was 1 kg, the angle of drawing the pencil was 45 °, and the drawing speed of the pencil was 60 mm / min. 5 times, and when a scratch occurs more than once, it is measured by using a pencil of the pencil hardness level, and when it is 5 times of the evaluation, it is the maximum pencil hardness value when there is no scratch.

2. Curvature radius: Window film (width x length x thickness, 3 cm x 15 cm x 100 m, substrate layer thickness: 50 m, coating layer thickness: 50 m) was wound around the curvature testing JIG, And whether cracks were generated in the film were visually evaluated. At this time, the direction of compression was such that the coating layer contacted the JIG and the tensile direction contacted the base layer with the JIG. The radius of curvature was measured by decreasing the diameter of the JIG starting from when the radius of the JIG was the maximum in the compression direction. The radius of curvature was determined as the minimum radius of the JIG without cracking.

7, a window film 1 having a base layer thickness of 50 m and a coating layer thickness of 50 m was cut into a width x length (10 cm x 10 cm), and a substrate layer was cut on the bottom surface 2 The maximum height H from the bottom surface 2 to the edge portion of the window film 1 when the window film 1 is placed on the bottom surface 2 and left at 25 ° C and 50% And the mean value was calculated three times.

4. Appearance: The appearance of orange peel, wavy patterns and wrinkles on the surface of the coating layer in the window film was visually evaluated. Whether these were formed or not was judged as irregular shading on the black sheet surface when light was transmitted on the post-coated surface where the window film was placed 10 cm above the black sheet. 1 'when no irregularities (orange peel) and wrinkles were formed such as wave pattern, orange surface,' 2 'when one or both of them were formed, and' 3 'when all were formed. Window films having an appearance of '2' or '3' can not be used in a display device.

Example 1 Example 2 Example 3 Example 4 Silicon monomer
(mol%) 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane 90 90 95 85 3-methacryloxypropyltrimethoxysilane 10 10 5 15 Siloxane resin In formula 1-1-1, x 0.90 0.90 0.95 0.85 In formula 1-1-1, y 0.03 0.06 0.01 0.05 In formula 1-1-1, z 0.07 0.04 0.04 0.10 Weight average molecular weight 8000 7600 7300 6800 Crosslinking agent (parts by weight) 10 10 10 10 Initiator (parts by weight) 3 3 3 3 Pencil hardness 9H 9H 8H 7H Radius of curvature (mm) 2 2 2 One Curling (mm) 5 5 4 2 Exterior One One One One

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Silicon monomer
(mol%) 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane 100 - 70 70 3-methacryloxypropyltrimethoxysilane - 100 30 30 Siloxane resin In formula 1-1-1, x 1.0 0 0.7 0.7 In formula 1-1-1, y 0 0.85 0.15 0.1 In formula 1-1-1, z 0 0.15 0.15 0.2 Crosslinking agent (parts by weight) 10 10 10 10 Initiator (parts by weight) 3 3 3 3 Pencil hardness 8H Uncured 4H 2H Radius of curvature (mm) 5 N.A. 3 3 Curling (mm) 12 N.A. One One Exterior 2 N.A. One One

* In Table 2, N.A. indicates "not measurable".

As shown in Table 1, the flexible window film according to the embodiment of the present invention has a pencil hardness of 6H or more and a high hardness, a curvature radius of 5.0 mm or less, flexibility, curling of 10.0 mm or less, It can be used as a flexible window film.

However, as shown in Table 2, Comparative Example 1 including a siloxane resin containing no (R 2 SiO 3/2 ) and (R 3 SiO 3/2 ) in the formula (1) Appearance was not good. Comparative Example 2 containing a siloxane resin containing no (R 1 SiO 3/2 ) in Chemical Formula 1 according to this example was uncured and no film was formed. In addition, Comparative Example 3 and Comparative Example 4 containing a siloxane resin deviating from x, y, and z in this embodiment had excellent appearance but had a problem in that the hardness was severely deteriorated. Therefore, the compositions for window films of Comparative Examples 1 to 4 could not produce a flexible window film that could be used in a display device.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

A composition for a window film comprising a siloxane resin having the following formula (1), a crosslinking agent and an initiator,
&Lt; Formula 1 >
(R 1 SiO 3/2 ) x (R 2 SiO 3/2 ) y (R 3 SiO 3/2 ) z
(Wherein R 1 is an alicyclic epoxy group or alicyclic epoxy group-containing functional group,
R 2 is a (meth) acrylate group or a (meth) acrylate group-containing functional group,
R 3 is a hydroxyl group or hydroxyl group-containing functional group,
0 < y < 1, 0 < z &
The composition for a window film is coated on a polyimide film having a thickness of 50 占 퐉 and cured to form a coating layer having a thickness of 50 占 퐉. The pencil hardness is 6H or more, the radius of curvature is 5.0mm or less,
Wherein the siloxane resin has a weight average molecular weight of 6,500 to 10,000. The composition for a window film according to claim 1, wherein the siloxane resin is represented by the following Formula 1-1:
&Lt; Formula 1-1 >
(EcSiO3 / 2 ) x (MpSiO3 / 2 ) y (HpSiO3 / 2 ) z
(3-methacryloxypropyl group, Hp is a 3-hydroxypropyl group, 0.85? X? 0.97, 0 < y <1, 0 <z <1, 0.03? y + z? 0.15, x + y + z = 1). delete The composition for a window film according to claim 1, wherein the crosslinking agent comprises at least one of a non-cyclic aliphatic epoxy monomer, a cyclic aliphatic epoxy monomer, an aromatic epoxy monomer, a hydrogenated aromatic epoxy monomer, and an oxetane monomer. A flexible window film comprising a base layer and a coating layer formed on one surface of the base layer, wherein the coating layer is formed of the composition for a window film according to any one of claims 1, 2 and 4. The flexible window film according to claim 5, wherein an adhesive layer is further formed on the other surface of the base layer. A flexible display device comprising the flexible window film of claim 5. The touch panel of claim 7, wherein the flexible display device comprises a display unit, an adhesive layer formed on the display unit, a polarizer formed on the adhesive layer, a touch screen panel formed on the polarizer, Wherein the flexible display device comprises a film. The flexible display device according to claim 7, wherein the flexible display device comprises a display unit, a touch screen panel formed on the display unit, a polarizing plate formed on the touch screen panel, and the flexible window film formed on the polarizing plate . The flexible display device according to claim 7, wherein the flexible display device comprises a display portion, an adhesive layer formed on the display portion, and the flexible window film formed on the adhesive layer. The flexible display device according to claim 10, wherein the display unit further comprises a polarizer at an upper portion or a lower portion.
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