KR20170024662A - Composition for window film, flexible window film prepared using the same and flexible display apparatus comprising the same - Google Patents

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

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KR20170024662A
KR20170024662A KR1020150119871A KR20150119871A KR20170024662A KR 20170024662 A KR20170024662 A KR 20170024662A KR 1020150119871 A KR1020150119871 A KR 1020150119871A KR 20150119871 A KR20150119871 A KR 20150119871A KR 20170024662 A KR20170024662 A KR 20170024662A
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window film
sio
group
formula
flexible
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KR1020150119871A
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KR101788392B1 (en
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우창수
강경구
김민혜
박지환
임지선
장승우
한동일
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삼성에스디아이 주식회사
삼성전자주식회사
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Priority to KR1020150119871A priority Critical patent/KR101788392B1/en
Priority to US15/755,486 priority patent/US10711157B2/en
Priority to CN201680049027.7A priority patent/CN107922737B/en
Priority to PCT/KR2016/009433 priority patent/WO2017034342A1/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • 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
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04102—Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper

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Abstract

The purpose of the present invention is to provide a composition for a window film capable of realizing a flexible window film having excellent hardness, flexibility and optical reliability such as light fastness reliability or the like. To this end, provided are a composition for a window film comprising a silicon resin represented by chemical formula 1: (R^1 SiO_3/2)_x(SiO_3/2-R^2-SiO_3/2)_y, a cross-linking agent and an initiator, a flexible window film formed therefrom, and a flexible display apparatus comprising the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a composition for a window film, a flexible window film formed therefrom, and a flexible display device including the window film.

The present invention relates to a composition for a window film, a flexible window film formed therefrom, and a flexible display device including 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, optical reliability such as flexibility, hardness and light reliability must be good.

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 having excellent optical reliability such as hardness, flexibility and light fastness reliability.

Another object of the present invention is to provide a composition for a window film which can realize a window film having good adhesion to a substrate layer.

Another object to be solved by the present invention is to provide a flexible window film which is excellent in optical reliability such as hardness, flexibility and light fastness reliability and has good adhesion to a substrate layer.

Another object of the present invention is to provide a flexible display device including the flexible window film.

The composition for a window film of the present invention may comprise a silicone resin, a crosslinking agent and an initiator,

≪ Formula 1 >

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

(Wherein R 1 , R 2 , x and y are as defined in the detailed description of the present invention).

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 flexible 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 having excellent optical reliability such as hardness, flexibility and light fastness reliability.

The present invention provides a composition for a window film that can realize a window film having good adhesion to a substrate layer.

The present invention provides a flexible window film excellent in optical reliability such as hardness, flexibility and light fastness reliability and excellent in adhesion to a substrate layer.

The present invention provides a flexible 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.

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.

The terms "upper" and "lower" in this specification 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 test piece is wound around a curvature radius test JIG (CFT-200R, COVOTECH) and kept for 5 seconds to loosen the test piece. It means the minimum radius of the JIG that does 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.

In the present specification, "DELTA YI" means that the yellow index (Y1) is measured using a color difference meter (CM3600D, Konica Minolta) under the condition of D65 light source 2 DEG , When yellow light (Y2) was measured by the same method by irradiating the window film with light having a wavelength of 306 nm for 72 hours by using light resistance devices (Xe-1 and Q-sun) (Y2-Y1).

As used herein, "(meth) acrylic" means acrylic and / or methacrylic.

"Substituted ", as used herein, unless otherwise stated, means that at least one hydrogen atom in the functional group is replaced by a hydroxyl group, an unsubstituted C1 to C10 alkyl group, a C1 to C10 alkoxy group, a C3 to C10 cycloalkyl group, a C6 to C20 aryl Group, or an arylalkyl group having from 7 to 20 carbon atoms.

The term "alicyclic epoxy group" as used herein means an epoxidized C3 to C10 cycloalkyl group.

In the present specification, the "alicyclic epoxy group-containing functional group" means a C1 to C12 alkyl group having an alicyclic epoxy group.

The term "glycodoxin"

Figure pat00001
(* Denotes the connecting part of the element).

As used herein, the term " glycidoxime-containing functional group "means a C1 to C12 alkyl group having a glycodoxy period.

As used herein, the term "arylene group" means a divalent aryl group. As used herein, "aryl group" includes monocyclic, non-fused polycyclic, or fused polycyclic functional groups. In this case, fusion refers to a ring shape in which carbon atoms divide adjacent pairs. The aryl group may mean a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, a chrysenyl group and the like. The aryl group may also include a biphenyl group, a terphenyl group, or a quaterphenyl group in which two or more aryl groups are connected through a sigma bond.

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 silicone resin, a cross-linking agent, and an initiator. The composition for a window film according to the present embodiment includes a silicone resin including the structural formula (1), thereby increasing optical reliability such as hardness, flexibility and light resistance reliability of a window film formed by curing the resin. In particular, the composition for a window film according to the present embodiment can realize a window film having a sufficiently high hardness without containing nanoparticles or the like. In addition, the silicone resin containing the formula (1) can be prepared by controlling the ratio of the silicone monomers according to desired physical properties, so that it is easy to control the hardness, flexibility and optical reliability of the window film. The composition for a window film according to this embodiment may have good adhesiveness to a film formed by the base layer described below, particularly a polyimide resin, a polyester resin or the like:

≪ Formula 1 >

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

(Wherein R 1 represents an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidoxy group or a glycidoxy group-containing functional group,

R 2 is a substituted or unsubstituted C1 to C10 alkylene group, or a substituted or unsubstituted C6 to C30 arylene group,

0 <x <1, 0 <y <1, x + y = 1).

Hereinafter, a silicone resin (hereinafter also referred to as a &quot; silicone resin &quot;) containing the formula (1) will be described.

In formula (1), R 1 may provide crosslinkability to the silicone resin. Specifically, R 1 may be an (epoxycyclohexyl) methyl group, an (epoxycyclohexyl) ethyl group, an (epoxycyclohexyl) propyl group, a glycidoxy group or a glycidoxypropyl group.

SiO 3/2 -R 2 -SiO 3/2 in the formula (1) increases the hardness of the window film and increases the flexibility of the window film by increasing the degree of crosslinking of the window film. In the formula (1), SiO 3/2 -R 2 -SiO 3/2 can also increase the optical reliability of the window film. When the silicone resin of the formula (1) is replaced by a silicone resin of R 1 SiO 3/2 and a second silicone monomer which provides SiO 3/2 -R 2 -SiO 3/2 , the hardness, Optical reliability may not be good. Specifically, R 2 may be an alkylene group of C 1 to C 8 or an arylene group of C 6 to C 20. The "alkylene group" may be linear or branched. More specifically, R 2 may be a methylene, ethylene, propylene, butylene, pentylene, hexylene, heptylene, octylene or phenylene group.

Specifically, 0.8? X <1, 0 <y? 0.2, more specifically 0.8? X? 0.999 and 0.001? Y? 0.2, more specifically 0.9? X? 0.99 and 0.01? Y? . Within this range, the coating composition of the composition for a window film is good, and flexibility and optical reliability of the window film can be excellent. Especially when 0.9? X? 0.99 and 0.01? Y? 0.1, the hardness, flexibility and optical reliability of the window film are excellent and the adhesion to the base layer can be excellent.

The silicone resin may have a weight average molecular weight of 2,000 to 20,000, specifically 4,500 to 10,000. Within this range, it may be effective to support the coating layer of the window film and increase the flexibility and optical reliability of the window film. The silicone resin may have a polydispersity index (PDI) of 1.0 to 3.0, specifically 1.5 to 2.5. Within this range, coating properties are good and coating properties may be stable. The silicone resin may have an epoxy equivalent of 0.1 mol / 100 g to 1.0 mol / 100 g, specifically 0.3 mol / 100 g to 0.8 mol / 100 g. Within this range, the coating property of the composition is good and the coating property of the window film can be stable.

Specifically, the silicone resin may be a silicone resin comprising any one of the following formulas 1-1 to 1-8:

&Lt; Formula 1-1 >

(EcSiO 3/2 ) x (SiO 3/2 -C 2 H 4 -SiO 3/2 ) y

(1-2)

(EcSiO 3/2 ) x (SiO 3/2 -C 6 H 4 -SiO 3/2 ) y

<Formula 1-3>

(GpSiO 3/2 ) x (SiO 3/2 -C 2 H 4 -SiO 3/2 ) y

<Formula 1-4>

(GpSiO 3/2 ) x (SiO 3/2 -C 6 H 4 -SiO 3/2 ) y

&Lt; Formula 1-5 >

(EcSiO 3/2 ) x (SiO 3/2 -C 6 H 12 -SiO 3/2 ) y

<Formula 1-6>

(GpSiO 3/2 ) x (SiO 3/2 -C 6 H 12 -SiO 3/2 ) y

<Formula 1-7>

(EcSiO 3/2 ) x (SiO 3/2 -C 8 H 16 -SiO 3/2 ) y

&Lt; Formula (1-8)

(GpSiO 3/2 ) x (SiO 3/2 -C 8 H 16 -SiO 3/2 ) y

(In the above formulas 1-1 to 1-8, Ec is an epoxycyclohexylethyl group and Gp is a glycidoxypropyl group, 0 <x <1, 0 <y <1, x + y = 1).

The silicone resin may be included in the composition for a window film alone or in combination of two or more. (R 1 SiO 3/2 ) and (SiO 3/ 2- R 2 -SiO 3/2 ) in the silicone resin may be contained individually or in combination of two or more.

Hereinafter, a method for producing a silicone resin will be described.

The silicone resin may be prepared by hydrolysis and condensation of a silicone monomer mixture comprising a first silicone monomer and a second silicone monomer. The first silicone monomer is used in an amount of 80 mol% or more and less than 100 mol%, specifically 80 mol% to 99.9 mol%, specifically 90 mol% to 99 mol%, of the silicone monomer mixture, more than 0 mol% and 20 mol% In an amount of 0.1 mol% to 20 mol%, more specifically 1 mol% to 10 mol%. Within this range, the hardness, flexibility and optical reliability of the window film can be improved.

The first silicone monomer may be a silane compound having the R &lt; 1 &gt; group of the formula (1). Specifically, the first silicone monomer may be represented by the following formula (2). These may be used alone or in combination of two or more:

(2)

Figure pat00002

(Wherein R 1 is as defined in Formula 1, and R 3 , R 4, and R 5 are each independently a hydroxyl group or a C 1 to C 10 alkoxy group). More specifically, the first silicone monomer is a trialkoxysilane compound, for example, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) (3,4-epoxycyclohexyl) ethyltriethoxysilane, (3-glycidoxypropyl) trimethoxysilane, (3- (3,4-epoxycyclohexyl) ethyltriethoxysilane, Glycidoxypropyl) triethoxysilane), and the like, but are not limited thereto.

The second silicone monomer may be a silane compound providing (SiO 3/2 -R 2 -SiO 3/2 ) of the above formula (1). Specifically, the second silicone monomer may be represented by the following formula (3). These may be used alone or in combination of two or more:

(3)

Figure pat00003

(Wherein R 2 is as defined in Formula 1 and R 6 , R 7 , R 8 , R 9 , R 10, and R 11 are each independently a hydroxyl group or a C 1 to C 10 alkoxy group).

More specifically, the second silicone monomer is selected from the group consisting of 1,2-bis (triethoxysilyl) ethane, 1,2-bis (trimethoxysilyl) ethane (1,2- bis (trimethoxysilyl) ethane, 1,6-bis (triethoxysilyl) hexane, 1,6-bis (trimethoxysilyl) bis (trimethoxysilyl) hexane, 1,8-bis (triethoxysilyl) octane, 1,8-bis (trimethoxysilyl) octane, 1,4-bis (triethoxysilyl) benzene, and the like.

The hydrolysis and condensation reaction of the silicone monomer mixture can be carried out according to a conventional method for producing a silicone resin. Hydrolysis may comprise reacting the silicone monomer mixture in water and a mixture of one or more of the desired acids and bases. Specifically, the acid is strong acid such as HCl, HNO 3 , and the base may be NaOH, KOH, or the like as a strong base. The hydrolysis can be carried out at 20 ° C to 100 ° C for 10 minutes to 7 hours. The hydrolysis efficiency of the first silicone monomer and the second silicone monomer can be increased within the above range. The condensation reaction can be carried out at 50 DEG C to 100 DEG C for 10 minutes to 12 hours under the same conditions as the hydrolysis. The condensation reaction efficiency of the first silicone monomer and the second silicone monomer can be increased within the above range.

Hereinafter, the crosslinking agent will be described.

The crosslinking agent may contain a crosslinkable functional group to increase the hardness of the window film. Further, the crosslinking agent can increase the flexibility and optical reliability of the window film together with the silicone resin containing the formula (1). The 'crosslinkable functional group' may mean an epoxy group or an oxetane group.

The crosslinking agent may further include at least one of a chain-like aliphatic hydrocarbon group, a cyclic aliphatic hydrocarbon group, and a hydrogenated aromatic hydrocarbon group to further increase the flexibility of the coating layer.

Specifically, the crosslinking agent may include at least one of a chain type aliphatic epoxy monomer, a cyclic aliphatic epoxy monomer, a hydrogenated aromatic hydrocarbon epoxy monomer, and an oxetane monomer, and these may be included singly or in combination.

Chain aliphatic epoxy monomers include 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol 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'-epoxycyclohexanecarboxylate (epsilon -caprolactone modified 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxy-cyclohexanecarboxylate, trimethylcaprolactone modified 3,4-epoxycyclohexylmethyl-3', 4'-epoxycyclohexylmethyl-3 ' epoxy-cyclohexanecarboxylate, 3,4-epoxycyclohexylmethyl-3 ', 4'-valerolactone modified 3,4-epoxycyclohexylmethyl 3 ', 4'-epoxycyclohexanecarboxylate), 1,4-cyclohexanedimethanol bis (3,4-epoxycyclohexanecarboxylate), 1,4-cyclohexanedimethanol bis (3,4-epoxycyclohexylmethyl) ether, ethylenebis (3,4-epoxycyclohexanecarboxylate)) (ethylenebis (3,4-epoxycyclohexanecarboxylate)), 3,4-epoxycyclohexylmethyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, 3,4-epoxycyclohexylmethyl Room 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.

The hydrogenated aromatic hydrocarbon epoxy monomer means a compound obtained by selectively hydrogenating an aromatic epoxy monomer under a pressure in the presence of a catalyst. Aromatic epoxy monomers include, for example, 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; Glycidyl ethers of tetrahydroxyphenylmethane, glycidyl ethers of tetrahydroxybenzophenone, and epoxy polyvinylphenols, and the like.

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- [ Ethyl-3 - [[(3-ethyloxetan-3-yl)] methoxy] methyl] oxetane , and the like, but is not limited thereto.

The crosslinking agent is included in an amount of 0.1 to 50 parts by weight, specifically 1 to 30 parts by weight, more specifically 5 to 25 parts by weight, more particularly 5 to 20 parts by weight, based on 100 parts by weight of the silicone resin . Within this range, the hardness, flexibility and optical reliability of the window film can be improved.

Next, the initiator will be described.

The initiator may be one or more of a photocationic initiator and a photocatalytic initiator to cure the silicone resin and the crosslinking agent comprising the structural formula (1). 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, an onium salt including a cation and an anion can be used. Specific examples of the cation include diphenyliodonium, 4-methoxydiphenyliodonium, bis (4-methylphenyl) iodonium, bis (4-tert-butyl Diiodonium iodonium such as bis (4-tert-butylphenyl) iodonium and bis (dodecylphenyl) iodonium, triphenylsulfonium, diphenyl- (Diphenylsulfonio) phenyl] sulfide, etc.) such as diphenyl-4-thiophenoxyphenylsulfonium and the like; . Hexafluoro Specific examples of the anionic phosphate (PF 6 -), tetrafluoroborate (BF 4 -), hexafluoroantimonate (SbF 6 -), hexafluoroantimonate are Senate (AsF 6 -), hexachloro And antimonate (SbCl 6 - ).

The initiator may be included in an amount of 0.01 to 20 parts by weight, specifically 1 to 10 parts by weight, more specifically 1 to 5 parts by weight, based on 100 parts by weight of the silicone resin. Within this range, the silicone 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 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 silicone resin. 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, propyleneglycolmonomethylether, and propyleneglycolmonomethyletheracetate.

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, / RTI &gt;

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 탆 to 200 탆, specifically 20 탆 to 150 탆, more specifically 35 탆 to 100 탆. 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, specifically, 88% to 100% in a visible light region specifically at a wavelength of 400 nm to 800 nm. Specifically, the flexible window film 100 may have a haze of 0.1% to 1.0% specifically 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 YI of 5.0 or less. In the above range, it is excellent in hardness, flexibility, and light resistance and can be used as a flexible window film. 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 YI value of 0.1 to 5.0.

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 may be manufactured by a method of manufacturing a flexible window film including coating and curing a composition for a window film according to an embodiment 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 an embodiment 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.

3 to 6 show a flexible display device. However, the present invention is not limited thereto, and it goes without saying that the window film according to the present embodiments can be applied to 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

Was dissolved in a proportion of 97 mol% of 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane (Sigma Aldrich) and 3 mol% of 1,2-bis (triethoxysilyl) ethane (Sigma Aldrich) 50 g of the mixture was placed in a 200 ml 2-neck flask. To the flask was added 2 mol% of KOH catalyst relative to the silicone monomer mixture and 1 mol% of water based on the ethoxyl group in the monomer mixture. The mixture was stirred at 65 캜 for 4 hours to obtain (EcSiO 3/2 ) 0.97 (SiO 3/2 - C 2 H 4 -SiO 3/2 ) 0.03 (Ec is 2- (3,4-epoxycyclohexyl) ethyl group). Residual solvent was removed with a vacuum distillation apparatus and methyl isobutyl ketone was added to adjust the solid content to 90% by weight. The weight average molecular weight of the silicone resin determined by gel permeation chromatography was 6,000.

10 parts by weight of a cross-linking agent CY-179 (Ciba) and 2 parts by weight of initiator diphenyliodonium hexafluorophosphate (TCI) were mixed with 100 parts by weight of the silicone resin to prepare a composition for a window film.

The resulting composition for a window film was applied to a polyimide film (thickness: 80 탆), dried at 100 캜 for 5 minutes, irradiated with UV of 1000 mJ / cm 2 and further heated at 100 캜 for 12 hours, A window film having a thickness of 50 탆 was produced.

Examples 2 to 8

A silicone resin was prepared in the same manner as in Example 1, except that the kind of the silicone monomer and / or the mol% in the silicone monomer mixture in the silicone monomer mixture was changed as shown in Table 1 below. Using the silicone resin thus prepared, a composition for a window film was prepared in the same manner as in Example 1. A window film was prepared in the same manner as in Example 1 except that the composition for a window film was used.

Comparative Example 1 and Comparative Example 2

A silicone resin was prepared in the same manner as in Example 1 except that the kind of the silicone monomer and / or the mol% in the silicone monomer mixture in the silicone monomer mixture was changed as shown in Table 2 below. Using the silicone resin thus prepared, a composition for a window film was prepared in the same manner as in Example 1. A window film was prepared in the same manner as in Example 1 except that the composition for a window film was used.

Comparative Example 3

A silicone resin was prepared in the same manner as in Example 1. A composition for a window film was prepared by mixing 2 parts by weight of diphenyliodonium hexafluorophosphate (TCI) with 100 parts by weight of the silicone resin. A window film was prepared in the same manner as in Example 1 except that the composition for a window film was used.

Comparative Example 4

50 g of a silicone monomer mixture containing 100 mol% of 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane (Sigma Aldrich) was placed in a 200 ml 2-neck flask. The flask was charged with 2 mol% of the KOH catalyst relative to the 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane and 1 mol% of the 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane, Of water was added, and the mixture was stirred at 65 DEG C for 4 hours. Residual solvent was removed with a vacuum distillation apparatus and methyl isobutyl ketone was added to adjust the solid content to 90% by weight. The weight average molecular weight of the silicone resin determined by gel permeation chromatography was 6,000.

10 parts by weight of CY-179 (Ciba), 2 parts by weight of diphenyliodonium hexafluorophosphate (TCI), and 2 parts by weight of 1,2-bis (triethoxysilyl) ethane 10 parts by weight were mixed to prepare a composition for a window film. A window film was prepared in the same manner as in Example 1 except that the composition for a window film was used.

Comparative Example 5

Was dissolved in a proportion of 97 mol% of 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane (Sigma Aldrich) and 3 mol% of 1,2-bis (triethoxysilyl) ethane (Sigma Aldrich) 50 g of the mixture was placed in a 200 ml 2-neck flask. To the flask was added KOH catalyst of 2 mol% based on the silicone monomer mixture and 1 mol% of water based on the ethoxyl group in the monomer mixture, and the mixture was stirred at 20 ° C for 4 hours. Residual solvent was removed with a vacuum distillation apparatus and methyl isobutyl ketone was added to adjust the solid content to 90% by weight.

100 parts by weight of the total hydrolyzate of each of the hydrolyzate of 2- (3,4-epoxycyclohexyl) ethyl triethoxysilane and 1,2-bis (triethoxysilyl) ethane prepared above was added to 100 parts by weight of CY-179 10 parts by weight) and 2 parts by weight of diphenyliodonium hexafluorophosphate (TCI) were mixed to prepare a composition for a window film. A window film was prepared in the same manner as in Example 1 except that the composition for a window film was used.

The following properties (1) to (3) 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: A window film (width x length x thickness, 3 cm x 15 cm x 130 m, substrate layer thickness: 80 m, coating layer thickness: 50 m) was wound around a curvature radius test JIG (CFT-200R, COVOTECH) After holding for at least 5 seconds, the film was visually evaluated for cracking when it was loosened by JIG. At this time, the direction of the compression was measured by allowing the coating layer to contact the JIG, and the tensile direction was measured by allowing the base layer to contact the JIG. The radius of curvature was measured by decreasing the diameter of the JIG starting from when the radius of the JIG was maximized in the direction of compression. The radius of curvature was determined as the minimum radius of the JIG without cracking.

(3) △ Y.I .: The yellow index (Y1) of the window film was measured using a color difference meter (CM3600D, Konica Minolta) at a D65 light source 2 ° (angle between the window film and the light source). Then, the window film was irradiated with light having a peak wavelength of 306 nm for 72 hours by using a light stabilizer (Xe-1, Q-sun), and the yellow index (Y2) was evaluated in the same manner. Optical reliability such as light fastness reliability was determined using the difference in yellow index before light irradiation and after light irradiation (Y2-Y1, YI).

Example One 2 3 4 5 6 7 8 2- (3,4-epoxycyclohexyl) ethyltriethoxysilane (mol%) 97 95 - - 97 95 - - 3-glycidoxypropyl
Trimethoxysilane (mol%) - - 97 95 - - 97 95 1,2-bis (triethoxysilyl) ethane (mol%) 3 5 3 5 - - - - 1,4-bis (triethoxysilyl) benzene (mol%) - - - - 3 5 3 5 Crosslinking agent (parts by weight) 10 10 10 10 10 10 10 10 Initiator (parts by weight) 2 2 2 2 2 2 2 2 Pencil hardness 8H 8H 7H 7H 8H 8H 7H 7H Radius of curvature (mm) 3.2 3.5 2.2 2.4 3.5 3.7 2.7 2.9 Y.I. 1.8 1.9 1.9 2.0 2.1 2.2 2.2 2.3

Comparative Example One 2 3 4 5 * 2- (3,4-epoxycyclohexyl)
Ethyltriethoxysilane (mol%) 100 - 97 100 97 3-glycidoxypropyltrimethoxysilane (mol%) - 100 - - - 1,2-bis (triethoxysilyl) ethane (mol%) - - 3 - 3 1,4-bis (triethoxysilyl) benzene (mol%) - - - - - Crosslinking agent (parts by weight) 10 10 - 10 10 Initiator (parts by weight) 2 2 2 2 2 1,2-bis (triethoxysilyl) ethane (parts by weight) - - - 10 - Pencil hardness 5H 4H 5H 4H 3H Radius of curvature (mm) 5.6 5.1 7.4 5.7 7.2 Y.I. 6.2 6.4 6.5 6.7 6.3

*: Includes hydrolyzate of silicone monomers

As shown in Table 1, the window film formed from the composition for a window film according to the embodiments of the present invention had a pencil hardness of 6H or more, a radius of curvature of 5.0 mm or less and flexibility, The optical reliability was good. Although not shown in Table 1, it was confirmed that the window film formed from the composition for a window film according to the embodiments of the present invention had a high adhesion to a polyimide resin film as a substrate layer.

On the other hand, the pencil hardness, the radius of curvature, and the optical reliability of Comparative Example 1 and Comparative Example 2 which did not include the silicone resin according to the present example were not as good as those of the present invention. In Comparative Example 3, which did not contain a crosslinking agent, the flexibility was insufficient because the radius of curvature was relatively high. Comparative Example 4, which contained 1,2-bis (triethoxysilyl) ethane in the form of a mixture without the silicone resin according to this example, had a relatively low pencil hardness. In addition, Comparative Example 5, which does not include the silicone resin according to this embodiment and contains the hydrolyzate of the silicone monomer, has a problem that the radius of curvature is high and the pencil hardness is relatively low.

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 (14)

A composition for a window film comprising a silicone resin, a crosslinking agent and an initiator,
&Lt; Formula 1 >
(R 1 SiO 3/2 ) x (SiO 3/ 2- R 2 -SiO 3/2 ) y
(In the formula 1,
R 1 represents an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidoxy group or a glycidoxy group-containing functional group,
R 2 is a substituted or unsubstituted C1 to C10 alkylene group or a substituted or unsubstituted C6 to C30 arylene group,
0 <x <1, 0 <y <1, x + y = 1). The composition for a window film according to claim 1, wherein the silicone resin comprises any one of the following formulas 1-1 to 1-8:
&Lt; Formula 1-1 >
(EcSiO 3/2 ) x (SiO 3/2 -C 2 H 4 -SiO 3/2 ) y
(1-2)
(EcSiO 3/2 ) x (SiO 3/2 -C 6 H 4 -SiO 3/2 ) y
<Formula 1-3>
(GpSiO 3/2 ) x (SiO 3/2 -C 2 H 4 -SiO 3/2 ) y
<Formula 1-4>
(GpSiO 3/2 ) x (SiO 3/2 -C 6 H 4 -SiO 3/2 ) y
&Lt; Formula 1-5 >
(EcSiO 3/2 ) x (SiO 3/2 -C 6 H 12 -SiO 3/2 ) y
<Formula 1-6>
(GpSiO 3/2 ) x (SiO 3/2 -C 6 H 12 -SiO 3/2 ) y
<Formula 1-7>
(EcSiO 3/2 ) x (SiO 3/2 -C 8 H 16 -SiO 3/2 ) y
&Lt; Formula (1-8)
(GpSiO 3/2 ) x (SiO 3/2 -C 8 H 16 -SiO 3/2 ) y
(In the above formulas 1-1 to 1-8, Ec is an epoxycyclohexylethyl group and Gp is a glycidoxypropyl group, 0 <x <1, 0 <y <1, x + y = 1). The composition for a window film according to claim 1, wherein 0.9? X? 0.99 and 0.01? Y? 0.1 in the formula (1). The composition for a window film according to claim 1, wherein the silicone resin has a weight average molecular weight of 2,000 to 20,000. The composition for a window film according to claim 1, wherein the cross-linking agent comprises at least one of an alicyclic epoxy carboxylate and an alicyclic epoxy (meth) acrylate. The composition for a window film according to claim 1, wherein the crosslinking agent is contained in an amount of 1 to 30 parts by weight based on 100 parts by weight of the silicone resin. A base layer and a coating layer formed on one surface of the base layer,
Wherein the coating layer is formed from the composition for a window film according to any one of claims 1 to 6. The flexible window film according to claim 7, wherein an adhesive layer is further formed on the other surface of the base layer. The flexible window film according to claim 7, wherein the flexible window film has a pencil hardness of 6H or more, a radius of curvature of 5.0 mm or less, and? Y.I. A polarizing plate formed on the adhesive layer, a touch screen panel formed on the polarizing plate, and a flexible window film formed on the touch screen panel,
Wherein the flexible window film comprises a coating layer formed from a composition for a window film comprising a silicone resin, a crosslinking agent and an initiator,
&Lt; Formula 1 >
(R 1 SiO 3/2 ) x (SiO 3/ 2- R 2 -SiO 3/2 ) y
(In the formula 1,
R 1 represents an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidoxy group or a glycidoxy group-containing functional group,
R 2 is a substituted or unsubstituted C1 to C10 alkylene group or a substituted or unsubstituted C6 to C30 arylene group,
0 <x <1, 0 <y <1, x + y = 1). A touch screen panel formed on the display unit, a polarizing plate formed on the touch screen panel, and a flexible window film formed on the polarizing plate,
Wherein the flexible window film comprises a coating layer formed from a composition for a window film comprising a silicone resin, a crosslinking agent and an initiator,
&Lt; Formula 1 >
(R 1 SiO 3/2 ) x (SiO 3/ 2- R 2 -SiO 3/2 ) y
(In the formula 1,
R 1 represents an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidoxy group or a glycidoxy group-containing functional group,
R 2 is a substituted or unsubstituted C1 to C10 alkylene group or a substituted or unsubstituted C6 to C30 arylene group,
0 <x <1, 0 <y <1, x + y = 1). A display portion, an adhesive layer formed on the display portion, and the flexible window film formed on the adhesive layer,
Wherein the flexible window film comprises a coating layer formed from a composition for a window film comprising a silicone resin, a crosslinking agent and an initiator,
&Lt; Formula 1 >
(R 1 SiO 3/2 ) x (SiO 3/ 2- R 2 -SiO 3/2 ) y
(In the formula 1,
R 1 represents an alicyclic epoxy group, an alicyclic epoxy group-containing functional group, a glycidoxy group or a glycidoxy group-containing functional group,
R 2 is a substituted or unsubstituted C1 to C10 alkylene group or a substituted or unsubstituted C6 to C30 arylene group,
0 <x <1, 0 <y <1, x + y = 1). 13. The flexible display device according to claim 12, wherein the display unit further comprises a polarizer at an upper portion or a lower portion. 14. The flexible display device according to any one of claims 10 to 13, wherein the flexible window film has a pencil hardness of 6H or more, a radius of curvature of 5.0 mm or less, and DELTA YI of 5.0 or less.
KR1020150119871A 2015-08-25 2015-08-25 Composition for window film, flexible window film prepared using the same and flexible display apparatus comprising the same KR101788392B1 (en)

Priority Applications (4)

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KR1020150119871A KR101788392B1 (en) 2015-08-25 2015-08-25 Composition for window film, flexible window film prepared using the same and flexible display apparatus comprising the same
US15/755,486 US10711157B2 (en) 2015-08-25 2016-08-25 Composition for window film, flexible window film formed therefrom, and flexible display device comprising same
CN201680049027.7A CN107922737B (en) 2015-08-25 2016-08-25 Composition for window film, flexible window film formed from the composition, and flexible display including the flexible window film
PCT/KR2016/009433 WO2017034342A1 (en) 2015-08-25 2016-08-25 Composition for window film, flexible window film formed therefrom, and flexible display device comprising same

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019191330A (en) * 2018-04-24 2019-10-31 東洋紡株式会社 Foldable display surface protective film
US10591761B2 (en) 2016-10-21 2020-03-17 Samsung Electronics Co., Ltd. Flexible plastic substrate and display device including same

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* Cited by examiner, † Cited by third party
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US7018463B2 (en) * 2003-07-24 2006-03-28 Lens Technology I, Llc Abrasion resistant coating composition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10591761B2 (en) 2016-10-21 2020-03-17 Samsung Electronics Co., Ltd. Flexible plastic substrate and display device including same
JP2019191330A (en) * 2018-04-24 2019-10-31 東洋紡株式会社 Foldable display surface protective film
JP2022153403A (en) * 2018-04-24 2022-10-12 東洋紡株式会社 Foldable display surface protective film

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