TWI662082B - Composition for window film and flexible window film prepared using the same - Google Patents

Abstract

The present invention provides a composition for a window film comprising a first silicone resin represented by Formula 1, a second silicone resin represented by Formula 2, a cross-linking agent, and an initiator, and a composition comprising A flexible window film formed from a composition of a window film.

Description

Composition for window film and flexible window film prepared using the same

[Cross Reference to Related Applications]

This application claims the rights of Korean Patent Application 10-2016-0142438, filed on October 28, 2016, Korean Patent Application 10-2017-0004437, filed on January 11, 2017, the Korean patent The full disclosure of the application is incorporated into this case for reference.

The present invention relates to a composition for a window film and a flexible window film formed from the composition for a window film.

Recently, since a glass substrate or a high-hardness substrate is replaced with a film in a display, a flexible display capable of being folded or unfolded has been developed in the prior art. Flexible displays are light and thin, have high impact resistance, and can be folded and unfolded.

Since the window film is disposed at the outermost side of the display, the window film needs to have good flexibility and high hardness. The window film includes a base layer and a coating. When used in flexible displays, window films need to be able to face or coat the substrate The layers fold well. In particular, a window film that is well folded toward the base layer allows the image displayed on the display to be seen not only by a single observer but also by multiple observers, so compared to a film folded toward the coating Window film will have better usability.

The window film is disposed at the outermost side of the display. Therefore, a window film having low scratch resistance can be easily scratched, thereby causing deterioration in screen quality. Specifically, a minute scratch caused by a user's hand or the like may not only cause deterioration in screen quality, but also cause deterioration in appearance.

Since the window film is formed by depositing a coating solution on the substrate layer, non-uniform deposition of the coating solution will result in poor surface quality, which will cause the displayed image to flicker or be distorted and unclear.

The background art of the present invention is disclosed in Japanese Unexamined Patent Publication No. 2007-176542.

An object of the present invention is to provide a composition for a window film, which can achieve good scratch resistance and exhibit good performance in any folding direction when folded toward a base layer or a coating layer. Flexible window film.

Another object of the present invention is to provide a composition for a window film, which can achieve a window film having a good surface quality on a window coating.

Another object of the present invention is to provide a composition for a window film, The composition for a window film can achieve a flexible window film having high hardness.

It is still another object of the present invention to provide a composition for a window film, which can form a window film after curing by ultraviolet (UV) without a separate heat treatment and And / or aging so as not to affect the degree of curing due to the surrounding environment such as temperature or humidity, thereby improving processability.

Another object of the present invention is to provide a composition for a window film, which can achieve a window film having high impact resistance.

It is still another object of the present invention to provide a flexible window film including a coating formed from the composition for a window film according to the present invention.

According to an aspect of the present invention, a composition for a window film may include a first silicone resin represented by Formula 1, a second silicone resin represented by Formula 2, 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 (R ⁴ R ⁵ SiO _2/2 ) _w (R ⁶ R ⁷ R ⁸ SiO _{1 / 2} ) _u (SiO _4/2 ) _v

(Where R ¹ , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , x, y, z, w, u, and v are the same as defined in the following detailed description of the present invention ).

<Formula 2> (R ¹¹ SiO _3/2 ) _x (A ³ _b SiO _{(4-b) / 2} ) _y1 (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) _y2 (R ¹² SiO _3/2 ) _z (R ¹³ R ¹⁴ SiO _2/2 ) _w (R ¹⁵ R ¹⁶ R ¹⁷ SiO _1/2 ) _u (SiO _4/2 ) _v

(Where R ¹¹ , R ¹² , R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ , A ¹ , T ¹ , A ² , A ³ , x, y1, y2, z, w, u, v, and b (Same as defined in the following detailed description of the present invention).

According to another aspect of the present invention, a flexible window film includes: a base layer; and a coating layer formed on the base layer, wherein the flexible window film has a pencil hardness of 3H or higher, It has a radius of curvature of 5.0 mm or less in the stretching direction, and has a Reflected Image Quality (RIQ) value of 90 or more.

The present invention provides a composition for a window film, which can achieve a composition having good scratch resistance and exhibiting good flexibility in any folding direction when folded toward a base layer or a coating. Window film.

The invention provides a composition for a window film. The composition for a window film can achieve a window film having a good surface quality on a window coating.

The present invention provides a composition for a window film, which can achieve a flexible window film having high hardness.

The invention provides a composition for a window film, which is used for a window. The composition of the film can improve the processability by enabling a window film to be formed after UV curing without a separate heat treatment and / or aging to avoid affecting the degree of curing due to the surrounding environment such as temperature or humidity.

The present invention provides a composition for a window film, which can achieve a window film having high impact resistance.

The present invention provides a flexible window film including a coating formed from the composition for a window film according to the present invention.

100, 150, 200, 390‧‧‧ flexible window film

110, 110A‧‧‧ basal layer

110a‧‧‧first film

110b‧‧‧Second film

120‧‧‧ Coating

130, 110c, 360‧‧‧ Adhesive layer

300, 400, 500‧‧‧ flexible display

350a, 350b‧‧‧ Display

370‧‧‧polarizing plate

380‧‧‧Touch screen panel

FIG. 1 is a conceptual diagram of a composite of silicon dioxide nanoparticle and an example of a silicone resin represented by Formula 1. FIG.

2 is a cross-sectional view of a flexible window film according to an embodiment of the present invention.

3 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.

4 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a flexible display according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a flexible display according to another embodiment of the present invention.

FIG. 7 is a cross-sectional view of a flexible display according to another embodiment of the present invention.

Embodiments of the present invention will be explained in detail with reference to the drawings. It should be understood that the present invention is not limited to the following embodiments, but may be implemented in different ways. In the drawings, parts that are not relevant to this description will be omitted for clarity. Throughout this manual, the same components will be identified by the same reference numbers.

In this article, spatial relative terms such as "upper" and "lower" are defined with reference to drawings. Therefore, it should be understood that the term "upper surface" is used interchangeably with the term "lower surface". In addition, when an element (such as a layer or film) is referred to as being “on” another element, the element may be directly placed on the other element or intervening elements may be present. On the other hand, when an element is said to be placed "directly" on another element, there is no intervening element between the element and the other element.

As used herein, the term "(meth) acryl" refers to "acryl" and / or "methacryl".

Unless otherwise stated herein, the term "substituted" means that at least one hydrogen atom of a functional group is substituted with a hydroxyl group, an unsubstituted C ₁ to C ₁₀ alkyl group, a C ₁ to C ₁₀ alkoxy group, C ₃ to C ₁₀ cycloalkyl, C ₆ to C ₂₀ aryl, C ₇ to C ₂₀ arylalkyl, benzophenone, C ₆ to C ₂₀ aryl substituted with C ₁ to C ₁₀ alkyl, or C ₁ to C ₁₀ alkyl substituted with C ₁ to C ₁₀ alkoxy.

As used herein, "alkoxy" means alkylene-O-alkylene.

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

In this article, "Me" is methyl, "Ph" is phenyl, "Et" is ethyl, "Ety" is ethylene, "Pry" is ethylene, "Buty" is ethylene, and "X" ₁ "is an acrylate group (* -OC (= O) -CH (CH ₂ ), * is a linking site), and" X ₂ "is a methacrylate group (* -OC (= O) -CCH ₃ ( CH ₂ ), * is the attachment site), and "X" is a (meth) acrylate group.

As used herein, "Z", "Z _1" and "Z _2" respectively of the compound represented by Formula A, Formula B, and Formula C, and is self-pentaerythritol tri (meth) acrylate derived:

(Where * is the connection site)

(Where * is the connection site)

<Form C>

(Where * is the connection site).

Herein, "W" is a part of the compound represented by Formula D, and is derived from dipentaerythritol penta (meth) acrylate:

(Where * is the connection site).

Herein, "Fd" is 1H, 1H, 2H, 2H-perfluorodecyl, and "Fo" is 1H, 1H, 2H, 2H-perfluorooctyl.

As used herein, "mono- or polyalkylene oxide" is *-[-OR ^a- ] n-[-OR ^{a '} -] m-* (* is the attachment site of the element, R ^a and R ^{a '} are each independently a substituted or unsubstituted C ₁ to C ₅ alkylene, n is an integer of 1 to 5, and m is an integer of 0 to 5).

As used herein, "Ec" is 2- (3,4-epoxycyclohexyl) ethyl.

As used herein, "reflected image quality (RIQ)" refers to a measurement of the sharpness of an image that is reflected on the surface of a window coating. The reflected image quality can be measured using Rhopoint IQ (Rhopoint Co., Ltd.), and can be in the range of 0 to 100. The higher the quality of the reflected image (ie, the closer the value is to 100), the smoother the surface of the window coating and the better the appearance, that is, the better the surface quality.

In this article, the term "modulus" refers to the use of a dynamic viscoelastic instrument ARES (MCR-501, Anton Paar Co., Ltd.) under auto-strain conditions at 1 rad / sec (rad / sec) Storage rate measured at a shear rate of 1% and a strain rate of 1%. A sample was obtained by stacking the adhesive layer to a thickness of 500 μm after removing the release film and punching the stacked adhesive layer using a punch having a diameter of 8 mm. When measuring with an 8 mm jig, the temperature was increased from -60 ° C to 90 ° C at a rate of 5 ° C / minute, and the modulus was measured at -20 ° C, 25 ° C, and 80 ° C.

As used herein, the term "average particle size" of organic nano particles refers to the use of Zetasizer nano-ZS (Malvern Co., Ltd.) in aqueous solvents or organic solvents. The z-average particle diameter of the confirmed nano-particles measured by the scanning electron microscope (SEM) / transmission electron microscope (TEM) was measured in FIG.

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

The composition for a window film according to an embodiment of the present invention may include a first silicone resin, a second silicone resin, a crosslinking agent, and an initiator.

The first silicone resin and the second silicone resin will be explained in more detail. The first silicone resin includes at least one first repeating unit containing a urethane group (urethane bond) and at least one photoreactive functional group. The second silicone resin includes at least one first repeating unit containing at least one photoreactive functional group and at least one second repeating unit containing fluorine or an alkylene oxide. In one embodiment, the photo-reactive functional group is a radical-reactive functional group (eg, a photo-curable functional group), and may include a (meth) acrylate group.

Therefore, the composition for a window film according to the embodiment can provide a flexible window film that exhibits good scratch resistance and flexibility and has low diffusion to provide good surface quality. The composition for a window film can achieve a flexible window film including a base layer and a window coating formed from the composition for a window film, and when applied to the base layer or the window The layers show good foldability in any folding direction when folded. Specifically, the composition for a window film can achieve a window film that can be well folded not only toward the coating layer but also toward the base layer so that multiple observers can simultaneously see The image displayed on the monitor, thereby increasing the usability of the window film. Since a force is applied to the window coating when the window film is folded toward the base layer, the coating of the poorly flexible window film may crack. In addition, according to this embodiment The composition for a window film can achieve a window film having high hardness and low curl and exhibiting good impact resistance.

A composition for a window film including only the first silicone resin may exhibit poor surface quality due to low reflected image quality, and may have poor impact resistance. The composition for a window film containing only the second silicone resin may exhibit poor properties in terms of scratch resistance, flexibility, hardness, and impact resistance.

In addition, the composition for a window film according to this embodiment includes a first silicone resin and a second silicone resin, so that a window film can be formed after ultraviolet curing without a separate heat treatment and / or aging and without The surrounding environment, such as temperature and humidity, affects the degree of curing, thereby improving processability. In general, a composition for a window film including a silicone resin containing an epoxy group (such as an alicyclic epoxy group) needs to be subjected to an aging treatment after ultraviolet curing when forming a window coating.

Each of the first silicone resin and the second silicone resin may be independently provided to the composition for a window film. Alternatively, each of the first silicone resin and the second silicone resin may be provided in the form of a composite of a first silicone resin or a second silicone resin bonded to inorganic particles or organic particles. This structure is explained in more detail below.

Hereinafter, a composition for a window film according to an embodiment of the present invention will be explained. The composition for a window film according to this embodiment may include a first silicone resin represented by Formula 1, a second silicone resin represented by Formula 2, a crosslinking agent, and an initiator.

First, the silicone resin represented by Formula 1 will be explained. Said expressed by Formula 1 Silicone resin can improve the hardness, flexibility, scratch resistance and impact resistance of window films.

<Formula 1> (R ¹ SiO _3/2 ) _x (R ² SiO _3/2 ) _y (R ³ SiO _3/2 ) _z (R ⁴ R ⁵ SiO _2/2 ) _w (R ⁶ R ⁷ R ⁸ SiO _1/2 ) _u (SiO _4/2 ) _v

(Where R ¹ is a monovalent organic group containing one (meth) acrylate group and at least one urethane group; R ² is a monovalent organic group containing at least two (meth) acrylate groups and at least one urethane group A monovalent organic group of a radical; R ³ is a non-urethane-based monovalent organic group containing at least one (meth) acrylate group, an unsubstituted or substituted C ₁ to C ₂₀ alkyl group, an unsubstituted or Substituted C ₅ to C ₂₀ cycloalkyl or unsubstituted or substituted C ₆ to C ₃₀ aryl; R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently hydrogen and contain at least one (Meth) acrylate-based monovalent organic groups, unsubstituted or substituted C ₁ to C ₂₀ alkyl, unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl, or unsubstituted or substituted C ₆ to C ₃₀ aryl; and 0 x 1,0 y 1,0 z <1,0 w <1,0 u <1,0 v <1, x + y ≠ 0, and x + y + z + w + u + v = 1).

Specifically, R ¹ may be a monovalent organic group having one terminal (meth) acrylate group therein and containing at least one urethane group. In one embodiment, R ¹ may be represented by Formula i: <Formula i> *-Y ₁ -NH- (C = O) -OY ₂ -X

(Where * is the attachment site; Y ₁ and Y ₂ are each independently substituted or unsubstituted C ₁ to C ₂₀ alkylene, substituted or unsubstituted C ₅ to C ₂₀ cycloalkylene, or Substituted or unsubstituted C ₆ to C ₂₀ arylene; and X is a (meth) acrylate group).

Preferably, Y ₁ and Y ₂ are each independently a substituted or unsubstituted C ₁ to C ₁₀ alkylene group, more preferably a substituted or unsubstituted C ₁ to C ₅ alkylene group, such as Methylene, ethylene, propyl, butyl or pentyl. For example, R ¹ may be a monovalent organic group having one terminal (meth) acrylate group therein and containing one urethane group.

Specifically, R ² is a monovalent organic group having at least two terminal (meth) acrylate groups therein and containing at least one urethane group. In one embodiment, R ² may be represented by Formula ii: <Formula ii> *-Y ₃ -NH- (C = O) -OY _4- (X) _n

(Where * is the attachment site; Y ₃ is substituted or unsubstituted C ₁ to C ₂₀ alkylene, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl, or substituted or unsubstituted C ₆ to C ₂₀ alkylene; Y ₄ is a substituted or unsubstituted branched C ₃ to C ₂₀ alkylene; substituted or unsubstituted branched C ₃ to C ₂₀ alkylene; C ₅ to C ₂₀ cycloalkylene, containing substituted or unsubstituted branched C ₃ to C ₂₀ alkylene or substituted or unsubstituted branched C ₃ to C ₂₀ alkyleneoxy; or C ₆ to C ₂₀ aryl, containing substituted or unsubstituted branched C ₃ to C ₂₀ alkylene or substituted or unsubstituted branched C ₃ to C ₂₀ alkoxy; X is (methyl Group); an acrylate group; and n is an integer of 2 or more).

Preferably, Y _{3 is} each independently a substituted or unsubstituted C ₁ to C ₁₀ alkylene group, more preferably a substituted or unsubstituted C ₁ to C ₅ alkylene group, such as methylene , Ethylene, propyl, butyl or pentyl.

Preferably, Y ₄ is a substituted or unsubstituted branched C ₃ to C ₂₀ alkylene group. For example, Y ₄ is the following functional group derived from pentaerythritol or dipentaerythritol, but is not limited thereto:

(Where * is the connection site).

Preferably, n is an integer of 2 to 15, more preferably an integer of 2 to 5. For example, R ² may be a monovalent organic group having at least two terminal (meth) acrylate groups therein and containing one urethane group.

Specifically, R ³ is a non-urethane-based monovalent organic group that does not contain a urethane group and has at least one terminal (meth) acrylate group. For example, R ³ can be represented by Formula iii: <Formula iii> *-Y _5- (X) n

(Where * is the attachment site; Y ₅ is substituted or unsubstituted C ₁ to C ₂₀ alkylene, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl, or substituted or unsubstituted C ₆ to C ₂₀ arylene; X is a (meth) acrylate group; and n is an integer of 1 or more).

Preferably, Y ₅ is a substituted or unsubstituted C ₁ to C ₅ alkylene group, such as methylene, ethylidene, propylidene, butylidene, or pentylyl. Preferably, n is an integer from 1 to 6.

Specifically, R ³ is a substituted or unsubstituted C ₁ to C ₂₀ alkyl group, a substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl group, or a substituted or unsubstituted C ₆ to C ₃₀ Aryl. Preferably, R ³ is methyl, ethyl or phenyl.

Specifically, R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently hydrogen, a monovalent organic group containing at least one (meth) acrylate group, substituted or unsubstituted C ₁ to C ₁₀ alkyl, substituted or unsubstituted C ₅ to C ₁₀ cycloalkyl, or substituted or unsubstituted C ₆ to C ₁₀ aryl. Here, a monovalent organic group containing at least one (meth) acrylate group can be represented by the above-mentioned formula i, formula ii, or formula iii. Preferably, R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently substituted or unsubstituted C ₁ to C ₅ alkyl, such as methyl, ethyl, propyl, butyl Or amyl.

In Formula 1, (R ¹ SiO _3/2 ), (R ² SiO _3/2 ), (R ³ SiO _3/2 ), (R ⁴ R ⁵ SiO _2/2 ), and (R ⁶ R ⁷ Each of R ⁸ SiO _1/2 ) and (SiO _4/2 ) serves as two or more different units. For example, when the silicone resin of Formula 1 is represented by (R ¹ SiO _3/2 ) _x (R ² SiO _3/2 ) _{y of} Formula 1-1, (R ^1a SiO _3/2 ) _x1 (R ^1b SiO _{3/2) y} (R ^1a and R ^1b and R in the formula is the same as defined _{^{x2 (R 2 SiO 3/2) 1}} , and R ² is the same as defined in the formula R 1 ^2, (R ^1a and R ^1b are different from each other), and 0 <x1 <1, 0 <x2 <1, 0 <y <1, and x1 + x2 + y = 1) can also fall within the scope of the present invention.

In one embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units and T units as represented by Formula 1-1: <Formula 1-1> (R ¹ SiO _3/2 ) _x ( R ² SiO _3/2 ) _y

(Where R ¹ and R ² are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, and x + y = 1).

Specifically, in Equation 1-1, x and y can be set to satisfy 0.50 x 0.99, 0.01 y 0.50, and x + y = 1, preferably x and y are set to satisfy 0.70 x 0.99, 0.01 y 0.30 and x + y = 1, more preferably 0.80 x 0.99, 0.01 y 0.20, and x + y = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

For example, the silicone resin of Formula 1-1 may include a silicone resin represented by Formula 1-1-1 to Formula 1-1-10: <Formula 1-1-1> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-2> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-3> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y

(Where 0 <x <1, 0 <y <1, x + y = 1)

<Formula 1-1-4> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-5> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-6> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y

(Where 0 <x <1, 0 <y <1, x + y = 1)

<Formula 1-1-7> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Buty-O- (C = O) NH-Pry) SiO _{3 / 2} ) _x2 ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-8> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Pry-O- (C = O) NH-Pry) SiO _{3 / 2} ) _x2 ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-9> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Buty-O- (C = O) NH-Pry) SiO _{3 / 2} ) _x2 ((WO- (C = O) NH-Pry) SiO _3/2 ) _y

<Formula 1-1-10> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Pry-O- (C = O) NH-Pry) SiO _{3 / 2} ) _x2 ((WO- (C = O) NH-Pry) SiO _3/2 ) _y

(Where X is a (meth) acrylate group; and 0 <x1 <1, 0 <x2 <1, 0 <y <1, and x1 + x2 + y = 1).

In Formulas 1-1-1 to 1-1-6, x and y may be the same as in Chemical Formula 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

In Equations 1-1-7 to 1-1-10, x1, x2, and y can be set to satisfy 0.25 x1 0.50, 0.25 x2 0.50, 0.01 y 0.50, x1 + x2 + y = 1, preferably 0.30 x1 0.50, 0.30 x2 0.50, 0.01 y 0.30, x1 + x2 + y = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

In another embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units as represented by Formula 1-2: <Formula 1-2> (R ¹ SiO _3/2 ) _x

(Where R ¹ is the same as defined in Formula 1, and x is 1).

For example, the silicone resin represented by Formula 1-2 may include the silicone resin represented by Formula 1-2-1 to Formula 1-2-3: <Formula 1-2-1> ((X-Ety- O- (C = O) NH-Pry) SiO _3/2 )

<Formula 1-2-2> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 )

<Formula 1-2-3> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ).

In one embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units, T units, and T units as represented by Formula 1-3: <Formula 1-3> (R ¹ SiO _3/2 ) _x (R ² SiO _3/2 ) _y (R ³ SiO _3/2 ) _z

(Where R ¹ , R ² and R ³ are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, 0 <z <1, and x + y + z = 1).

Specifically, in Equations 1-3, x, y, and z can be set to satisfy 0.50 x 0.95, 0.01 y 0.40, 0.01 z 0.40, and x + y + z = 1, preferably 0.50 x 0.90, 0.01 y 0.30, 0.05 z 0.30 and x + y + z = 1, more preferably 0.50 x 0.80, 0.01 y 0.20, 0.05 z 0.30, and x + y + z = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

For example, the silicone resin of Formula 1-3 may include a silicone resin represented by Formula 1-3-1 to Formula 1-3-10: <Formula 1-3-1> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-2> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-3> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-4> ((X-Ery-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y (MeSiO _3/2 ) _z

<Formula 1-3-5> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y (PhSiO _3/2 ) _z

<Formula 1-3-6> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-7> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-8> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y ((X-Pry) SiO _3/2 ) _z

<Formula 1-3-9> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y (MeSiO _3/2 ) _z

<Formula 1-3-10> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y (PhSiO _3/2 ) _z

(Where 0 <x <1, 0 <y <1, 0 <z <1, and x + y + z = 1).

In another embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units, T units, and D units as represented by Formula 1-4: <Formula 1-4> (R ¹ SiO _{3 / 2} ) _x (R ² SiO _3/2 ) _y (R ⁴ R ⁵ SiO _2/2 ) _w

(Where R ¹ , R ² , R ⁴ and R ⁵ are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, 0 <w <1, and x + y + w = 1 ).

Specifically, in Equations 1-4, x, y, and w can be set to satisfy 0.50 x 0.95, 0.01 y 0.40, 0.01 w 0.30, and x + y + w = 1, preferably 0.60 x 0.95, 0.01 y 0.30, 0.01 w 0.20, and x + y + w = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

In another embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units, T units, and M units as represented by Formula 1-5: <Formula 1-5> (R ¹ SiO _{3 / 2} ) _x (R ² SiO _3/2 ) _y (R ⁶ R ⁷ R ⁸ SiO _1/2 ) _u

(Where R ¹ , R ² , R ⁶ , R ^7, and R ⁸ are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, 0 <u <1, and x + y + u = 1).

Specifically, in Equations 1-5, x, y, and u can be set to satisfy 0.50 x 0.95, 0.01 y 0.40, 0.01 u 0.30, and x + y + u = 1, preferably 0.60 x 0.95, 0.01 y 0.30, 0.01 u 0.20, and x + y + u = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

In another embodiment, the silicone resin of Formula 1 may be a silicone resin composed of T units, T units, and Q units as represented by Formula 1-6: <Formula 1-6> (R ¹ SiO _{3 / 2} ) _x (R ² SiO _3/2 ) _y (SiO _4/2 ) _v

(Where R ¹ and R ² are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, 0 <v <1, and x + y + v = 1).

Specifically, in Equation 1-6, x, y, and v may be set to satisfy 0.50 x 0.95, 0.01 y 0.40, 0.01 v 0.30, and x + y + v = 1, preferably 0.60 x 0.95, 0.01 y 0.30, 0.01 v 0.20, and x + y + v = 1. Within this range, the composition for a window film can provide good properties to the window film in terms of scratch resistance, hardness, and impact resistance, and can ensure that the window film is folded when the window film is folded toward the base layer or the window coating Good flexibility in any folding direction.

The silicone resin of Formula 1 may have 1,000 g / mol to 20,000 g / mol, specifically 1,500 g / mol to 10,000 g / mol, more specifically 2,000 g / mol to 6,000 g / Mohr's weight average molecular weight. Within this range, the composition for a window film can improve the appearance and transparency of the window film. The silicone resin of Formula 1 may have a polydispersity index (PDI) of 1.0 to 3.0, specifically 1.0 to 2.0. Within this range, the composition has good coatability and can secure stable coating properties.

10 to 80 parts by weight, specifically 20 to 80 parts by weight, and 30 to 80 parts by weight based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2 and the crosslinking agent The silicone resin of formula 1 in an amount of 40 parts by weight to 80 parts by weight, 50 parts by weight to 80 parts by weight, or 60 parts by weight to 80 parts by weight. Within this range, the composition for a window film can provide the window film with good properties in terms of scratch resistance, flexibility, hardness, and impact resistance.

Next, the silicone resin of Formula 2 will be explained.

<Formula 2> (R ¹¹ SiO _3/2 ) _x (A ³ _b SiO _{(4-b) / 2} ) _y1 (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) _y2 (R ¹² SiO _3/2 ) _z (R ¹³ R ¹⁴ SiO _2/2 ) _w (R ¹⁵ R ¹⁶ R ¹⁷ SiO _1/2 ) _u (SiO _4/2 ) _v

(Wherein R ¹¹ is a monovalent organic group containing at least one (meth) acrylate group and at least one urethane group, or a non-urethane-based monovalent organic group containing at least one (meth) acrylate group R ¹² is unsubstituted or substituted C ₁ to C ₂₀ alkyl, unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl, or unsubstituted or substituted C ₆ to C ₃₀ aryl ; R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ and R ¹⁷ are each independently hydrogen, a monovalent organic group containing at least one (meth) acrylate group, an unsubstituted or substituted C ₁ to C ₂₀ alkyl group , Unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl, or unsubstituted or substituted C ₆ to C ₃₀ aryl; A ³ is substituted or unsubstituted C ₁ To C ₃₀ alkyl, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl containing at least one fluorine, or substituted or unsubstituted C ₆ to C ₂₀ aryl containing at least one fluorine; b is An integer of 1 to 3; A ¹ and A ² are each independently a single bond or substituted or unsubstituted C ₁ to C ₅ alkylene; T ¹ is a monoalkylene oxide or a polyalkylene oxide; and 0 <x <1 0 <y1 + y2 <1,0 y1 <1,0 y2 <1,0 z <1,0 w <1,0 u <1,0 v <1, and x + y1 + y2 + z + w + u + v = 1).

Specifically, R ¹¹ may represent the structure of Formula i, Formula ii, or Formula iii.

Specifically, A ³ may be C ₁ to C ₁₀ fluoroalkyl, C ₁ to C ₁₀ perfluoroalkyl, C ₁ to C ₁₀ alkyl having C ₁ to C ₁₀ fluoroalkyl, or C ₁ to C ₁₀ perfluoroalkyl group a C ₁ to C ₁₀ alkyl group. More specifically, A ³ may be 1H, 1H, 2H, 2H-perfluorodecyl, 1H, 1H, 2H, 2H-perfluorooctyl, or 1H, 1H, 2H, 2H-perfluorohexyl.

Specifically, A ¹ and A ² are each independently a single bond, ethylene, n-propyl, isopropyl, 1,2-butyl, 1,3-butyl, 1,4-butyl Butyl or 2,3-butylene.

Specifically, T ¹ may be *-[-OC ₂ H _4- ] _n- * (* is a connection site).

In one embodiment, the silicone resin of Formula 2 may be represented by Formula 2-1: <Formula 2-1> (R ¹¹ SiO _3/2 ) _x (A ³ _b SiO _{(4-b) / 2} ) _y1 (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) _y2

(Where R ¹¹ , A ³ , A ¹ , A ² , T ¹ and b are the same as defined in Formula 2, and 0 <x <1, 0 <y1 + y2 <1,0 y1 <1,0 y2 <1, and x + y1 + y2 = 1).

In Equation 2-1, x, y1, and y2 can be set to satisfy 0.85 x 0.99, 0.01 y1 0.15, and y2 = 0, or 0.85 x 0.99, 0.01 y2 0.15 and y1 = 0, specifically 0.90 x 0.99, 0.01 y1 0.10, and y2 = 0, or 0.90 x 0.99, 0.01 y2 0.10, and y1 = 0. Within this range, the composition for a window film can achieve a window film having good properties in terms of hardness, surface quality, and flexibility.

For example, the silicone resin of Formula 2-1 may include a silicone resin represented by Formula 2-1-1 to Formula 2-1-9: <Formula 2-1-1> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x (FdSiO _3/2 ) _y1

<Formula 2-1-2> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x (FoSiO _3/2 ) _y1

<Formula 2-1-3> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x (FdSiO _3/2 ) _y1

<Formula 2-1-4> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x (FoSiO _3/2 ) _y1

<Formula 2-1-5> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x (FdSiO _3/2 ) _y1

<Formula 2-1-6> ((X-Pry-O- (C = O) NH-Pty) SiO _3/2 ) _x (FoSiO _3/2 ) _y1

(Where 0 <x <1, 0 <y1 <1, and x + y1 = 1)

<Formula 2-1-7> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2

<Formula 2-1-8> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2

<Formula 2-1-9> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2

(Where 0 <x <1, 0 <y2 <1, and x + y2 = 1).

The silicone resin of Formula 2 may have 1,000 g / mol to 20,000 g / mol, specifically 1,500 g / mol to 10,000 g / mol, more specifically 2,000 g / mol to 6,000 g / Mohr's weight average molecular weight. Within this range, the composition for a window film can improve the appearance and transparency of the window film. The silicone resin of Formula 2 may have a polydispersity index (PDI) of 1.0 to 3.0, specifically 1.0 to 2.0. Within this range, the composition has good coatability and can secure stable coating properties.

Based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2, and the crosslinking agent, 0.1 to 50 parts by weight, specifically 0.1 to 40 parts by weight, 0.1 to 30 parts by weight, 0.1 parts by weight to 20 parts by weight, 0.1 parts by weight to 10 parts by weight, 0.1 parts by weight to 5 parts by weight, or 0.1 parts by weight to 1 The silicone resin of Formula 2 in an amount by weight. Within this range, the composition for a window film can achieve a window film having good properties in terms of surface quality, flexibility, and the like.

The crosslinking agent is cured together with the silicone resin of Formula 1 and the silicone resin of Formula 2, thereby further improving the hardness and flexibility of the window film. The cross-linking agent may include a monomer containing at least one, preferably at least two, such as 2 to 15 free-radical reactive functional groups. The radical-reactive functional group may be a (meth) acrylate group.

The (meth) acrylate monomer may include a bifunctional (meth) acrylate, such as 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, Neopentyl glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, neopentyl glycol adipate di (meth) acrylate, dicyclopentyl di (meth) acrylate Ester, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified di (meth) acrylate, di (meth) acryloxyethyl isocyanurate Acid esters, allyl cyclohexyl di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, dimethylol dicyclopentane di (meth) acrylate, ethylene oxide Hexane-modified hexahydrophthalate di (meth) acrylate, neopentyl glycol-modified trimethylpropane di (meth) acrylate, adamantane di (meth) acrylate, and 9,9 -Bis [4- (2-propenyloxyethoxy) phenyl] fluorene; trifunctional acrylates, such as trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate , Propionic acid modified dipentaerythritol tri (meth) acrylic acid , Pentaerythritol tri (meth) acrylate and ethylene oxide modified trimethylolpropane triacrylate (e.g. ethoxylated (6) trimethylolpropane triacrylate and ethoxylated (9) Trimethylolpropane triacrylate); tetrafunctional acrylates, such as diglycerol tetra (methyl) Acrylates and pentaerythritol tetra (meth) acrylates; pentafunctional acrylates, such as dipentaerythritol penta (meth) acrylate; and hexafunctional acrylates, such as dipentaerythritol hexa (meth) acrylate, caprolactone modification Dipentaerythritol hexa (meth) acrylate and urethane (meth) acrylate (for example, the reaction product of an isocyanate monomer with trimethylolpropane tri (meth) acrylate), but it is not limited to this. These crosslinking agents may be used alone or in combination.

Preferably, the (meth) acrylate monomer includes a ring selected from the group consisting of ethoxylated (6) trimethylolpropane triacrylate, ethoxylated (9) trimethylolpropane triacrylate, and the like At least one trifunctional (meth) acrylate monomer in an oxane modified trimethylolpropane triacrylate.

The (meth) acrylate monomer may or may not include a urethane group. Urethane group-containing (meth) acrylate monomers can be obtained from commercial products or can be prepared by synthesis. For example, the urethane group-containing (meth) acrylate monomer may include CHTU-9607 (Camton Co., Ltd.) or AN-9696 (Camton Co., Ltd.) ), But it's not limited to this.

The crosslinking agent may include a monomer having an epoxy group or an oxetanyl group in addition to the (meth) acrylate monomer. The monomer having an epoxy group or an oxetanyl group may include at least one of a linear aliphatic hydrocarbon group, a cyclic aliphatic hydrocarbon group, and a hydrogenated aromatic hydrocarbon group to further improve the flexibility of the coating. The monomer having an epoxy group or an oxetanyl group may include a member selected from the group consisting of a linear aliphatic epoxy monomer, a cyclic aliphatic epoxy monomer, a hydrogenated aromatic hydrocarbon epoxy monomer, and an oxetane. At least one of a group consisting of a monomer and a mixture thereof.

The linear aliphatic epoxy monomer may include 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane triglycidyl Glyceryl ether, polyethylene glycol diglycidyl ether, glycerol triglycidyl ether, and polypropylene glycol diglycidyl ether; polyglycidyl alcohol obtained by adding one or more alkylene oxides to an aliphatic polyol Glyceryl ethers, such as ethylene glycol, propylene glycol, glycerol, etc .; diglycidyl esters of aliphatic long-chain dibasic acids; monoglycidyl ethers of higher fatty alcohols; glycidyl ethers of higher fatty acids; epoxylated soybean oil; Butyl stearate; octyl epoxy stearate; epoxy linseed oil; epoxy polybutadiene and the like.

The cyclic aliphatic epoxy monomer is a compound having at least one epoxy group in an alicyclic group. Specifically, the cyclic aliphatic epoxy monomer may include an alicyclic epoxy carboxylic acid ester, an alicyclic epoxy (meth) acrylate, and the like. More specifically, the cyclic aliphatic epoxy monomer may include (3,4-epoxycyclohexyl) methyl-3 ', 4'-epoxycyclohexanecarboxylate, diglycidyl 1,2 -Cyclohexanedicarboxylate, 2- (3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy) cyclohexane-m-dioxane, bis (3,4- (Epoxy-6-methylcyclohexyl) adipate, 3,4-epoxy-6-methylcyclohexylmethyl-3 ', 4'-epoxy-6'-methylcyclohexyl Alkyl carboxylate, ε-caprolactone modified 3,4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate, trimethylcaprolactone modified 3, 4-epoxycyclohexylmethyl-3 ', 4'-epoxycyclohexanecarboxylate, β-methyl-δ-valerolactone modified 3,4-epoxycyclohexylmethyl-3' , 4'-epoxycyclohexane carboxylate, 1,4-cyclohexanedimethanol bis (3,4-epoxycyclohexane carboxylate), ethylene glycol bis (3,4-epoxy ring Hexylmethyl) ether, ethylene bis (3,4-epoxycyclohexanecarboxylate), 3,4-epoxycyclohexylmethyl (meth) acrylate, bis (3,4-epoxycyclohexyl) (Methyl) adipate Esters, 4-vinylcyclohexene dioxide, vinylcyclohexene monoxide and the like.

The hydrogenated aromatic hydrocarbon epoxy monomer means a compound obtained by selectively hydrogenating an aromatic epoxy monomer under pressure conditions in the presence of a catalyst. Aromatic epoxy monomers may include, for example, bisphenol-type epoxy resins, such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and diglycidyl ether of bisphenol S; novolak-type epoxy resins , Such as phenol novolac epoxy resin, cresol novolac epoxy resin, and hydroxybenzaldehyde phenol novolac epoxy resin; and polyfunctional epoxy resins, such as glycidyl ether of tetrahydroxyphenylmethane, glycidol of tetrahydroxybenzophenone Ether and epoxy-based polyvinyl phenol.

The oxetane monomer may include at least one selected from the group consisting of 3-methyloxetane, 2-methyloxetane, 2-ethylhexyloxetane, 3 -Oxetanol, 2-methyleneoxetane, 3,3-oxetanedimethylthiol, 4- (3-methyloxet-3-yl) benzyl Nitrile, N- (2,2-dimethylpropyl) -3-methyl-3-oxetanemethylamine, N- (1,2-dimethylbutyl) -3-methyl- 3-oxetanylmethylamine, (3-ethyloxetan-3-yl) methyl (meth) acrylate, 4-[(3-ethyloxetan-3-yl) Methoxy] but-1-ol, 3-ethyl-3-hydroxymethyloxetane, xylylbis (oxetane), and 3- [ethyl-3 [[((3- Ethyloxet-3-yl)] methoxy] methyl] oxetane, but it is not limited to this.

Based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2, and the crosslinking agent, 1 to 50 parts by weight, specifically 1 to 40 parts by weight, 1 part by weight may be present The crosslinking agent is in an amount of 30 to 30 parts by weight or 1 to 20 parts by weight. Within this range, the composition can ensure It has good properties in terms of flexibility and hardness.

The initiator is used to cure the silicone resin of Formula 1, the silicone resin of Formula 2, and a cross-linking agent, and may include a photo radical initiator or a mixture thereof. The photo radical initiator can be selected from any photo radical initiator known to those skilled in the art. For example, the photo-radical initiator may be selected from the group consisting of hydroxyketone-based photo-radical initiators, phosphine oxide-based photo-radical initiators, benzoin-based photo-radical initiators, and aminoketone-based photo-radical initiators. Starting agent. Specifically, the photo-radical initiator may include 2,4,6-trimethylbenzylidene-diphenyl-phosphine oxide, bis (2,4,6-trimethylbenzylidene)- Phenyl-phosphine oxide, benzoin, benzoin methyl ether, benzoin ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone compounds (e.g. 2,2-dimethoxy-2-phenylbenzene Acetone, 2,2'-diethoxyacetophenone, 2,2'-dibutoxyacetophenone, 2-hydroxy-2-methylacetophenone, p-tert-butyltrichloroacetophenone , P-Third-butyldichloroacetophenone, 4-chloroacetophenone, 2,2'-dichloro-4-phenoxyacetophenone, dimethylaminoacetophenone, 2,2-bis (Methoxy-2-phenylacetophenone and 2,2-diethoxy-2-phenylacetophenone), 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2 -Benzyl-2-dimethylamino-1- (4-morpholinyl) -but-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- ( (Methylthio) phenyl] -2-morpholinyl-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) one, benzophenone, p- Phenyl benzophenone, 4.4-diethylamino benzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butyl Quinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethyl Thioxanthone, benzyldimethylketal, acetophenonedimethylketal, p-dimethylaminobenzoate, oligo [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] acetone] and the like. Preferably, a hydroxyketone is used Is a starter, such as 1-hydroxycyclohexylphenyl ketone.

The initiator may further include a typical photocationic initiator known to those skilled in the art. For example, the photocationic initiator may further include an onium salt compound.

Based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2, and the crosslinking agent, there may be 0.1 to 10 parts by weight, specifically 0.5 to 5 parts by weight, and more specifically The initiator is in an amount of 1 to 3 parts by weight. Within this range, the silicone resin can be sufficiently cured by the initiator, and can prevent the optical properties (transmittance, color, light stability, etc.) of the window film from being deteriorated due to the remaining initiator.

The composition for a window film according to the present embodiment may further include nano particles.

The nano particles may be independently contained in the composition for a window film without being coupled with the silicone resin of Formula 1 or the silicone resin of Formula 2. Nano particles can further increase the hardness of window films. The nano particles may include at least one of silicon dioxide, aluminum oxide, zirconia, and titanium oxide, but are not limited thereto.

Nano particles may include particles that are not subjected to surface treatment. Alternatively, the nano particles may be partially or completely surface-treated with a silicone compound to be mixed with the silicone resin. Alternatively, the nano particles may include (meth) acrylate-based surface-treated nano particles to increase the hardness of the window film by crosslinking with the silicone resin of Formula 1.

Nanoparticles are not limited to a particular shape or size. Specifically, the nano particles may include spherical particles, flake particles, or amorphous particles. Nano particles can have 100 Average particle size of 100 nm or less, specifically 1 nm to 100 nm, 5 nm to 50 nm, 10 nm to 20 nm, or 10 nm to 15 nm (D50) . Within this range, nano particles can increase the hardness of the window film without affecting the surface roughness and transparency of the window film.

Based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2, the cross-linking agent, and nano particles, there may be 0.1 to 60 parts by weight, specifically 1 to 30 parts by weight Amount of nano particles. Within this range, nano particles can increase the hardness of the window film without affecting its surface roughness and transparency. Here, the above-mentioned amounts of the silicone resin of Formula 1, the silicone resin of Formula 2 and the crosslinking agent may be present.

The composition for a window film according to the present embodiment may further include an additive. Additives provide additional functionality to window films. The additive may be any additive commonly used in window films in the prior art. Specifically, the additives may include at least one of the following: ultraviolet absorbers, reaction inhibitors, adhesion promoters, thixotropic agents, conductivity imparting agents, color modifiers, stabilizers, and antistatic agents , Antioxidants, leveling agents, anti-fingerprint agents and surface energy regulators, but not limited to them. The adhesion promoter may include a silane compound containing an epoxy group or an alkoxysilane group. The thixotropic agent may include fumed silica. The conductivity imparting agent may include metal powder, such as silver powder, copper powder, aluminum powder, and the like. The color modifier may include pigments, dyes, and the like. Ultraviolet absorbers can improve the light stability of window films. The ultraviolet absorbent can be any typical absorbent known to those skilled in the art. Specifically, the ultraviolet absorber may include at least one of a triazine ultraviolet absorber, a benzimidazole ultraviolet absorber, a benzophenone ultraviolet absorber, and a benzotriazole ultraviolet absorber, but Not limited to this. The leveling agent may include, but is not limited to, a silicone-based leveling agent such as a silicone-based leveling agent containing a (meth) acrylate group (eg, BYK-3500).

The additive may be present in an amount of 0.01 to 5 parts by weight, specifically 0.05 to 2.5 parts by weight, based on 100 parts by weight of the silicone resin of Formula 1, the silicone resin of Formula 2, and the crosslinking agent. Within this range, the additives can increase the hardness and flexibility of the window film while achieving its inherent effects.

The composition for a window film according to the present embodiment may further include a solvent to improve coatability, wettability, or processability. The solvent may include, but is not limited to, methyl ethyl ketone, methyl isobutyl ketone, and propylene glycol monomethyl ether acetate.

Next, a composition for a window film according to another embodiment of the present invention will be explained.

Except that the composition for a window film according to this embodiment further includes nano particles and at least a part of the silicone resin of Formula 1 or the silicone resin of Formula 2 is coupled to the nano particles to form a composite, according to this embodiment The composition of is substantially the same as the composition for a window film according to the above embodiment.

At least a part of the silicone resin of Formula 1 or the silicone resin of Formula 2 is coupled to the nanoparticle. Therefore, the composition for a window film according to the present embodiment can further enlarge a window compared with other compositions containing the same amount of the silicone resin of Formula 1, the silicone resin of Formula 2, and nano particles. The hardness of the film. Preferably, the composition for a window film comprises a mixture of a silicone resin and a composite comprising a silicone resin coupled to nanoparticle. With this structure, the composition can improve both the hardness and flexibility of the window film.

Compounding at least one (A) of the silicone resin of Formula 1 and the silicone resin of Formula 2 with at least one of the silicone resin of Formula 1 and the silicone resin of Formula 2 containing a nanoparticle coupled to a nanoparticle The compound (B) may have the compound (B) in an amount of 10 to 60% by weight, specifically 20 to 50% by weight. Within this range, the composition can improve both the hardness and flexibility of the window film while suppressing curling of the window film.

Nano particles may include the aforementioned nano particles.

FIG. 1 is a conceptual diagram of a composite of silicon dioxide nanoparticle and an example of a silicone resin represented by Formula 1. FIG. Referring to FIG. 1, the OH group on the surface of the silicon dioxide nanoparticle is coupled to the silicon of the silicone resin of Formula 1, whereby the silicon dioxide particles can be surface-treated with the silicone resin of Formula 1. Therefore, the nano particles can be efficiently mixed with the silicone resin of Formula 1, thereby improving the optical transparency of the window film while facilitating the production of the window film.

Next, a composition for a window film according to still another embodiment of the present invention will be explained.

The composition for a window film according to the present embodiment may include a silicone resin containing no radical-reactive functional group. For example, the composition for a window film according to this embodiment may include a third silicone resin represented by Formula 3: <Formula 3> (R ²¹ SiO _3/2 ) _x (R ²² SiO _3/2 ) _y (R ²³ R ²⁴ SiO _2/2 ) _z (R ²⁵ R ²⁶ R ²⁷ SiO _1/2 ) _w (SiO _4/2 ) _u

(Where R ²¹ is an epoxy group or an epoxy-containing functional group; R ²² is a substituted or unsubstituted C ₁ to C ₁₀ alkyl group, a substituted or unsubstituted C ₃ to C ₁₀ cycloalkyl group Or a substituted or unsubstituted C ₆ to C ₁₀ aryl group; R ²³ , R ²⁴ , R ²⁵ , R ²⁶ and R ²⁷ are each independently a substituted or unsubstituted C ₁ to C ₁₀ alkyl group, Substituted or unsubstituted C ₃ to C ₁₀ cycloalkyl, substituted or unsubstituted C ₆ to C ₁₀ aryl, epoxy or epoxy-containing functional group; and 0 <x 1,0 y <1,0 z <1,0 w <1,0 u <1, x + y + z + w + u = 1).

The epoxy group is an alicyclic epoxy group, and may be a C ₂ to C ₁₀ epoxylated cycloalkyl group, such as a 3,4-epoxycyclohexyl group or a glycidyloxy group. The epoxy-containing functional group may be a C ₁ to C ₁₀ alkyl group having an epoxy group, such as 2- (3,4-epoxycyclohexyl) ethyl or 3-glycidyloxypropyl.

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

Referring to FIG. 2, a flexible window film 100 according to an embodiment of the present invention may include a base layer 110 and a coating 120, wherein the coating 120 may be formed of a composition for a window film according to an embodiment of the present invention.

The base layer 110 can improve the mechanical strength of the flexible window film 100 by supporting the coating layer 120 of the flexible window film 100. The base layer 110 may be bonded to a display portion, a touch screen panel, or a polarizing plate via an adhesive layer or the like. The base layer 110 may be Optically transparent flexible resin. For example, the resin may include at least one selected from a polyester resin such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate Esters and polybutylene naphthalate; polycarbonate resins; polyimide resins; polystyrene resins; poly (meth) acrylate resins containing poly (methyl methacrylate); cycloolefin polymers Resin; and polyamide resin. These resins may be used alone or in the form of a mixture thereof. The base layer 110 may have a thickness of 10 to 200 micrometers, specifically 20 to 150 micrometers, and more specifically 50 to 100 micrometers. Within this range, the base layer can be used in flexible window films.

The coating layer 120 may be formed on one surface of the base layer 110 to protect the base layer 110, a display portion, a touch screen panel, or a polarizing plate and provide a desirable appearance, and has high flexibility and high hardness for use in Flexible display. The coating 120 may have a thickness of 5 to 100 microns, specifically 10 to 80 microns, and more specifically 10 to 50 microns. Within this range, coatings can be used in flexible window films.

Although not shown in FIG. 2, a functional surface layer such as an anti-reflection layer, an anti-glare layer, a hard coating layer, and an anti-fingerprint layer may be formed on the other surface of the coating 120 to provide additional functions. In addition, although not shown in FIG. 2, the coating layer 120 may be further formed on the other surface of the base layer 110.

The flexible window film 100 may have a transmittance of 88% or more in the visible range, specifically in a wavelength region of 400 nm to 800 nm, specifically 88% to 100%. Within this range, the flexible window film can be used as flexible Sex window film.

The flexible window film 100 may have a pencil hardness of 3H or higher, a radius of curvature of 5.0 mm or less in the stretching direction, and a radius of curvature of 5.0 mm or less in the compression direction. Within these ranges, the window film has good flexibility and can be used as a flexible window film. Herein, the term "curvature radius in the stretching direction" means the radius of curvature measured when the window film is folded toward the base layer after the base layer of the window film is brought into contact with a fixture for measuring the radius of curvature. Here, the term "curvature radius in the compression direction" means a curvature radius measured when the window film is folded toward the coating after the coating of the window film is brought into contact with a jig for measuring the curvature radius. Specifically, the flexible window film 100 may have a pencil hardness of 3H or more, for example, 3H to 9H, 0 mm to 5 mm in the stretching direction, for example, 0 mm to 1.0 mm, and more specifically It has a radius of curvature of 0 mm and has a radius of curvature of 0 mm to 5.0 mm in the compression direction, for example 0 mm to 1.0 mm or 0 mm.

The flexible window film 100 may have a tip of steel wool (e.g., Liberon steel wool # 0000) moving 40 mm on the window coating at a speed of 60 mm / sec under a load of 1.5 kg. The distance measured is one scratch or less. Within this range, the flexible window film has good scratch resistance to provide a good appearance. The flexible window film 100 may have an impact resistance of 4.5 cm or more as measured by a pen drop test described below. Within this range, the flexible window film has good impact resistance to prevent it from being mounted on organic light-emitting diodes. diode (OLED) panel, causing damage to the organic light emitting diode panel. Here, the organic light emitting diode panel may be a typical organic light emitting diode panel used in the prior art.

The flexible window film 100 may have a reflected image quality (RIQ) value of 90 or more, specifically 90 to 98. Within this range, the window film has good surface quality and can provide a clear image on a display.

The flexible window film 100 may have a thickness of 5 to 300 microns. Within this thickness range, the flexible window film can be used as a flexible window film.

Next, a flexible window film according to another embodiment of the present invention will be explained with reference to FIG. 3. 3 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.

Referring to FIG. 3, except that the flexible window film 200 according to the present embodiment further includes an adhesive layer 130 formed on another surface of the base layer 110, the flexible window film 200 is substantially the same as that according to the above embodiment Window film 100. The adhesive layer 130 formed on the other surface of the base layer 110 may facilitate adhesion between a flexible window film and a touch screen panel, a polarizing plate, or a display portion. Except for the adhesive layer, the flexible window film 200 according to the present embodiment is substantially the same as the window film 100 according to the above embodiment. Therefore, the following description will focus on the adhesive layer 130.

The adhesive layer 130 is used for adhering the flexible window film 200 to a touch screen panel, a polarizing plate, or a display portion that can be disposed under the flexible window film 200, and may be formed of an adhesive composition.

In one embodiment, the adhesive layer 130 may be composed of the following adhesive composition Form: The adhesive composition includes an adhesive resin (such as (meth) acrylic resin, urethane resin, silicone resin, and epoxy resin), a curing agent, a photoinitiator, and a silane coupling agent.

The (meth) acrylic resin may include a typical (meth) acrylic copolymer including an alkyl group, a hydroxyl group, an aromatic group, a carboxylic acid group, an alicyclic group, and a heteroalicyclic group. Base etc. Specifically, the (meth) acrylic resin may be formed of a monomer mixture containing at least one of: a (meth) acrylic monomer containing a C ₁ to C ₁₀ unsubstituted alkyl group, and containing at least one hydroxyl group C ₁ to C ₁₀ alkyl (meth) acrylic monomers, C ₆ to C ₂₀ aromatic (meth) acrylic monomers, carboxylic acid (meth) acrylic monomers, C ₃ (Meth) acrylic monomers to C ₂₀ cycloaliphatic groups and C ₃ to C ₁₀ heteroalicyclic groups containing C ₃ to C ₁₀ heterocyclic groups having at least one of nitrogen (S), oxygen (O), and sulfur (S) (Meth) acrylic monomer.

The curing agent may be a polyfunctional (meth) acrylate, and may include a bifunctional (meth) acrylate, such as hexanediol diacrylate; a trifunctional (meth) acrylate, such as trimethylolpropane tri ( Meth) acrylates; tetrafunctional (meth) acrylates, such as pentaerythritol tetra (meth) acrylate; pentafunctional (meth) acrylates, such as dipentaerythritol penta (meth) acrylic acid; and hexafunctional (methyl) ) Acrylates, such as, but not limited to, dipentaerythritol hexa (meth) acrylate.

Photoinitiators are typical photoinitiators, and may include the photoradical initiators described above.

The silane coupling agent may include a silane coupling agent containing an acrylic group, such as 3-propenyloxypropyltrimethoxysilane.

The adhesive composition may include 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 Silane coupling agent. Within this range, an adhesive layer formed of an adhesive composition can efficiently adhere a flexible window film to a display portion, a touch screen panel, or a polarizing plate.

In another embodiment, the adhesive layer 130 may be an adhesive layer 110 c described below.

The adhesive layer 130 may have a thickness of 10 to 100 micrometers. Within this thickness range, the adhesive layer 130 efficiently adheres the flexible window film to an optical device (such as a polarizing plate).

Next, a flexible window film according to another embodiment of the present invention will be explained with reference to FIG. 4. 4 is a cross-sectional view of a flexible window film according to another embodiment of the present invention.

Referring to FIG. 4, the flexible window film 150 is substantially the same as the flexible window film 100 except that the flexible window film 150 according to the present embodiment includes a base layer 110A instead of the base layer 110.

The base layer 110A includes a first film 110a, a second film 110b, and an adhesive layer 110c sandwiched between the first film 110a and the second film 110b. Because of having the base layer 110A, the flexible window film has improved flexibility and further improved impact resistance compared to a window film including the base layer 110.

Each of the first film 110a and the second film 110b may support the flexible window film 150. Each of the first film 110a and the second film 110h may be Optically transparent flexible resin. The first film 110a and the second film 110b may be formed of the same resin or different resins. For example, each of the first film 110a and the second film 110b may be selected from a polyester resin, a polycarbonate resin, a polyimide resin, a poly (meth) acrylate resin, and a cyclic olefin polymer. At least one of the resins is formed.

The first film 110a and the second film 110b may have the same thickness or different thicknesses. Each of the first film 110a and the second film 110b may have a thickness of 10 to 100 micrometers, preferably 30 to 50 micrometers. Within this thickness range, the first film and the second film can provide good effects in terms of flexibility and impact resistance.

The base layer 110A may have a thickness of 10 μm to 275 μm, specifically 20 μm to 200 μm, and more specifically 50 μm to 110 μm. Within this thickness range, the base layer 110A can be used in the flexible window film.

Although the coating layer 120 is shown as being formed directly on the second film 110b shown in FIG. 4, the first film 110a may also be directly formed on the coating layer 120 such that the second film 110b, the adhesive layer 110c, the first The thin film 110a and the coating layer 120 are sequentially stacked in the stated order.

The adhesive layer 110c is sandwiched between the first film 110a and the second film 110b to adhere the first film 110a to the second film 110b. The adhesive layer 110c can improve the bending reliability when the window film is repeatedly folded, and can improve the impact strength of the window film.

The adhesive layer 110c may have a temperature of 10 kPa to 1,000 kPa at 25 ° C. Modulus. Within this range, the adhesive layer can improve the impact resistance of the window film, and can ensure high reliability when the window film is folded once or repeatedly at room temperature. Preferably, the adhesive layer 110c has a modulus of 10 kPa to 800 kPa at 25 ° C.

The adhesive layer 110c may have a modulus of 10 kPa to 1,000 kPa at 80 ° C. Within this range, the adhesive layer can improve the impact resistance of the window film, and can ensure high reliability when the window film is folded once or repeatedly under high temperature / humidity conditions. Preferably, the adhesive layer 110c has a modulus of 10 kPa to 800 kPa at 80 ° C.

The adhesive layer 110c may have a modulus of 10 kPa to 1,000 kPa at -20 ° C. Within this range, the adhesive layer can improve the impact resistance of the window film, and can ensure high reliability when the window film is folded once or repeatedly at low temperatures. Preferably, the adhesive layer 110c has a modulus of 10 kPa to 500 kPa at -20 ° C.

The ratio of the modulus of the adhesive layer 110c at 25 ° C to the modulus at -20 ° C may be 1: 1 to 1: 4, specifically 1: 1 to 1: 3.5, and more specifically 1 : 1 to 1: 2.8. Within this range, the adhesive layer, while preventing delamination or bubbling in a foldable test, encounters fewer changes in properties due to changes in temperature over a wide temperature range (-20 ° C to 25 ° C), And therefore can be used in flexible optical components.

The ratio of the modulus of the adhesive layer 110c at 80 ° C to the modulus at -20 ° C may be 1: 1 to 1:10, specifically 1: 1 to 1: 8, and more specifically 1 : 1 to 1: 5. Within this range, the adhesive layer does not suffer from adhesive deterioration between the adherends, and thus can be used in flexible optical members.

The adhesive layer 110c may have a thickness of 10 to 75 micrometers. Thick here Within the range, the adhesive layer can ensure good properties in terms of flexibility and impact resistance of the window film. Preferably, the adhesive layer 110c has a thickness of 10 micrometers to 50 micrometers, more preferably 10 micrometers to 30 micrometers.

The adhesive layer 110c may have a haze of 5% or less, specifically 3% or less, and more specifically, 1% or less than 1% in a visible range under a thickness of 100 micrometers. Within this range, the adhesive layer may exhibit good transparency when used in an optical display.

The adhesive layer 110c may have a glass transition of 0 ° C or lower, for example, -150 ° C to 0 ° C, specifically -150 ° C to -20 ° C, and more specifically -150 ° C to -30 ° C. Temperature (Tg). Within this range, the adhesive layer can exhibit good viscoelasticity at low temperature and room temperature.

The adhesive layer 110c may be formed of an optically clear adhesive (OCA) composition. The adhesive layer 110c may be formed of an adhesive composition comprising a monomer mixture of a hydroxyl-containing (meth) acrylic copolymer; an initiator; and at least one of a macromonomer and an organic nanoparticle. One. The monomer mixture may be contained in the adhesive composition in a non-polymerized state or in a partially polymerized state. Preferably, the adhesive composition comprises a monomer mixture of a hydroxyl-containing (meth) acrylic copolymer; an initiator; and organic nano particles.

The monomer mixture may be composed of a hydroxyl-containing (meth) acrylate and an alkyl-containing (meth) acrylate.

The hydroxyl group-containing (meth) acrylate can impart adhesive strength to the adhesive layer. The hydroxyl-containing (meth) acrylate may be a (meth) acrylic acid containing at least one hydroxyl group ester. For example, a hydroxyl-containing (meth) acrylate may include at least one of the following: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (Meth) acrylate, 2-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxyhexyl (meth) acrylate, 1,4-cyclohexane Dimethanol mono (meth) acrylate, 1-chloro-2-hydroxypropyl (meth) acrylate, diethylene glycol mono (meth) acrylate, 1,6-hexanediol mono (meth) Acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, neopentyl glycol mono (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylol Ethanedi (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, 4-hydroxycyclopentyl (meth) acrylate, 4-hydroxycyclohexyl (methyl ) Acrylate and cyclohexanedimethanol mono (meth) acrylate. Based on the total amount of the hydroxyl-containing (meth) acrylate and the alkyl-containing (meth) acrylate, there may be 5% to 40% by weight, for example, 8% to 30% by weight, specifically, The hydroxyl-containing (meth) acrylate is in an amount of 10% to 30% by weight. Within this range, the adhesive composition can further improve the adhesive strength and durability of the adhesive layer.

The alkyl-containing (meth) acrylate may constitute a copolymer to form a matrix of an adhesive layer. The alkyl-containing (meth) acrylate may include unsubstituted C ₁ to C ₂₀ linear or branched alkyl (meth) acrylate. For example, an alkyl-containing (meth) acrylate may include at least one of the following: methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (meth) ) N-butyl acrylate, tertiary butyl (meth) acrylate, isobutyl (meth) acrylate, amyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate , Ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, (formyl) Base) lauryl acrylate and isobornyl (meth) acrylate. Based on the total amount of the hydroxyl-containing (meth) acrylate and the alkyl-containing (meth) acrylate, it may be 60% to 95% by weight, for example, 65% to 92% by weight, specifically, Alkyl-containing (meth) acrylates in an amount of 68 to 90% by weight, and more specifically 70 to 90% by weight. Within this range, the adhesive composition can further improve the adhesive strength and durability of the adhesive layer.

The monomer mixture may further include a copolymerizable monomer. In the (meth) acrylic copolymer, the polymerizable monomer can provide additional effects to the (meth) acrylic copolymer, the adhesive composition, and the adhesive layer. The copolymerizable monomer is different from a hydroxyl-containing (meth) acrylate and an alkyl-containing (meth) acrylate, and may include at least one of the following: an ethylene oxide-containing monomer, an epoxy-containing monomer Propane monomer, amine-containing monomer, alkoxy-containing monomer, phosphate-containing monomer, sulfonic acid-containing monomer, phenyl-containing monomer, silane-containing monomer, A carboxylic acid group-containing monomer and an amido group-containing (meth) acrylate.

The ethylene oxide-containing monomer may include at least one (meth) acrylate monomer containing an ethylene oxide group (—CH ₂ CH ₂ O—). For example, the ethylene oxide-containing monomer may include a polyethylene oxide alkyl ether (meth) acrylate monomer, such as polyethylene oxide monomethyl ether (meth) acrylate, polyepoxide Ethane monoethyl ether (meth) acrylate, polyethylene oxide monopropyl ether (meth) acrylate, polyethylene oxide monobutyl ether (meth) acrylate, polyethylene oxide monopentyl ether ( (Meth) acrylates, polyethylene oxide dimethyl ether (meth) acrylates, polyethylene oxide diethyl ether (meth) acrylates, polyethylene oxide monoisopropyl ether (meth) acrylates Polyethylene oxide monoisobutyl ether (meth) acrylate and polyethylene oxide monothird butyl ether (meth) acrylate, but it is not limited to this.

The propylene oxide-containing monomer may include a polypropylene oxide alkyl ether (meth) acrylate monomer, such as polypropylene oxide monomethyl ether (meth) acrylate, polypropylene oxide monoethyl ether (methyl) Acrylate, polypropylene oxide monopropyl ether (meth) acrylate, polypropylene oxide monobutyl ether (meth) acrylate, polypropylene oxide monopentyl ether (meth) acrylate, polypropylene oxide di Methyl ether (meth) acrylate, polypropylene oxide diethyl ether (meth) acrylate, polypropylene oxide monoisopropyl ether (meth) acrylate, polypropylene oxide monoisobutyl ether (meth) acrylate Esters and polypropylene oxide monotertiary butyl ether (meth) acrylates, but are not limited thereto.

The amine-containing monomer may include an amine-containing (meth) acrylate monomer, such as monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, Monomethylaminopropyl (meth) acrylate, monoethylaminopropyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl ( (Meth) acrylate, N-tert-butylaminoethyl (meth) acrylate, and (meth) acryloxyethyl trimethylammonium chloride, but it is not limited to this.

The alkoxy-containing monomer may include an alkoxy-containing (meth) acrylic monomer, such as 2-methoxyethyl (meth) acrylate, 2-methoxypropyl (meth) acrylate , 2-ethoxypropyl (meth) acrylate, 2-butoxypropyl (meth) acrylate, 2-methoxypentyl (meth) acrylate, 2-ethoxypentyl (Meth) acrylate, 2-butoxyhexyl (meth) acrylate, 3-methoxypentyl (meth) acrylate, 3-ethoxypentyl (meth) acrylate, and 3- Butoxyhexyl (meth) acrylate is not limited thereto.

The phosphate group-containing monomer may include a phosphate group-containing acrylic monomer, such as 2-methacrylfluorenyloxyethyldiphenyl phosphate (meth) acrylate, trimethacrylfluorenyloxyethyl Phosphate (meth) acrylate and tripropenyloxyethyl phosphate (meth) acrylate are not limited thereto.

The sulfonic group-containing monomer may include a sulfonic group-containing acrylic monomer, such as sodium sulfopropyl (meth) acrylate, sodium 2-sulfoethyl (meth) acrylate, and 2-acrylamido-2- Sodium methylpropane sulfonate, but it is not limited to this.

The phenyl-containing monomer may include a phenyl-containing (meth) acrylic monomer, such as p-third butylphenyl (meth) acrylate, o-biphenyl (meth) acrylate, and phenoxyethyl (Meth) acrylate, but not limited to this.

Silyl-containing monomers may include silyl-containing vinyl monomers, such as 2-ethylfluorenylacetoxyethyl (meth) acrylate, vinyltrimethoxysilane, vinyltriethoxysilane , Vinyltris (2-methoxyethyl) silane, vinyltriethylfluorenylsilane, and methacrylfluorenyloxypropyltrimethoxysilane, but it is not limited to this.

The carboxylic acid group-containing monomer may include (meth) acrylic acid, 2-carboxyethyl (meth) acrylate, 3-carboxypropyl (meth) acrylate, 4-carboxybutyl (meth) acrylate , Itaconic acid, butenoic acid, maleic acid, fumaric acid, and maleic anhydride, but it is not limited to this.

Amidino group-containing (meth) acrylates may include amidino group-containing (meth) acrylic monomers such as (meth) acrylamide, N-methyl (meth) acrylamide, N-hydroxyl Methyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, N-methylenebis (meth) acrylamide, N-hydroxyethyl (methyl) Acrylamide and N, N diethyl (methyl) propene Methenylamine is not limited to this.

15 parts by weight or less based on 100 parts by weight of the hydroxyl-containing (meth) acrylate and the alkyl-containing (meth) acrylate, specifically 10 parts by weight or less And more specifically, a copolymerizable monomer in an amount of 0.05 to 8 parts by weight. Within this range, the adhesive composition can further improve the adhesive strength and recovery of the adhesive layer.

The initiator is used to cure (partially polymerize) the monomer mixture into a (meth) acrylic copolymer, or to cure the adhesive liquid into an adhesive film. The initiator may include at least one of a photopolymerization initiator and a thermal polymerization initiator. The photopolymerization initiator may be any initiator as long as the initiator can cause polymerization of the radical polymerizable compound during curing by light irradiation. For example, the photopolymerization initiator may include a benzoin light initiator, a hydroxy ketone light initiator, an amino ketone light initiator, a phosphine oxide light initiator, and the like. Specifically, the photopolymerization initiator may include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone compounds (such as acetophenone, dimethylamino Acetophenone, 2,2-dimethoxy-2-phenylacetophenone and 2,2-diethoxy-2-phenylacetophenone), 2-hydroxy-2-methyl-1- Phenylpropan-1-one, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinyl-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4-diethylaminobenzophenone, dichlorobenzene Methyl ketone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2 -Chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethyl Amino benzoate, Oligomeric [2-hydroxy-2-methyl-1- [4- (1-methylvinyl) phenyl] acetone] and 2,4,6-trimethylbenzyl-diphenyl-oxidized Phosphine, but not limited to this. The thermal polymerization initiator may include any initiator as long as the initiator can cause polymerization of the polymerizable compound. For example, the thermal polymerization initiator may include any typical initiator, such as azo compounds, peroxide compounds, and redox compounds. Examples of the azo compound may include 2,2-azobis (2-methylbutyronitrile), 2,2-azobis (isobutyronitrile), 2,2-azobis (2,4-dimethylformaldehyde) Valeronitrile), 2,2-azobis-2-hydroxymethylpropionitrile, dimethyl-2,2-methylazobis (2-methylpropionate), and 2,2-azo Bis (4-methoxy-2,4-dimethylvaleronitrile), but it is not limited to this. Examples of the peroxide compound may include: inorganic peroxides, such as potassium perchlorate, ammonium persulfate, and hydrogen peroxide; and organic peroxides, such as diethylfluorenyl peroxide, peroxydicarbonate, peroxyester , Tetramethylbutyl peroxy neodecanoate, bis (4-butylcyclohexyl) peroxydicarbonate, bis (2-ethylhexyl) peroxycarbonate, butyl peroxy neodecanoate, Dipropylperoxydicarbonate, diisopropylperoxydicarbonate, diethoxyethylperoxydicarbonate, diethoxyhexylperoxydicarbonate, hexylperoxydicarbonate, Methoxybutyl peroxydicarbonate, bis (3-methoxy-3-methoxybutyl) peroxydicarbonate, dibutyl peroxydicarbonate, di-hexadecyl peroxide Dicarbonate, di-tetradecylperoxydicarbonate, 1,1,3,3-tetramethylbutyl pervalerate, hexyl pervalerate, butyl pervalerate Ester, trimethylhexylperoxide, dimethylhydroxybutylperoxy neodecanoate, pentylperoxy neodecanoate, butylperoxy neodecanoate , Third butyl peroxyheptanoate, pentyl pervalerate, third butyl pervalerate, third pentyl peroxy-2-ethylhexanoate, lauryl Base Oxides, dilaurylfluorenyl peroxide, didecylfluorenyl peroxide, benzamyl peroxide and dibenzofluorenyl peroxide, but are not limited thereto. Examples of the redox compound may include, but are not limited to, a mixture of a peroxide compound and a reducing agent.

Based on 100 parts by weight of the hydroxyl-containing (meth) acrylate and alkyl-containing (meth) acrylate constituting the (meth) acrylic copolymer, it may be 0.0001 to 5 parts by weight, specifically, The amount of the initiator is 0.001 to 3 parts by weight. Within this range, the initiator can completely cure the adhesive composition, can prevent the transmittance of the adhesive film from being deteriorated due to the residual initiator, can suppress the generation of bubbles, and can ensure good reactivity.

The macromonomer has a functional group that can be cured by actinic radiation and can be polymerized with a hydroxyl group-containing (meth) acrylate and an alkyl group-containing (meth) acrylate. Specifically, the macromonomer can be expressed by Equation 4:

Where R _{1 is} hydrogen or methyl, X is a single bond or a divalent coupling group, and Y is selected from methyl (meth) acrylate, ethyl (meth) acrylate, and n-butyl (meth) acrylate A polymer chain obtained by polymerizing at least one of isobutyl (meth) acrylate, tertiary butyl (meth) acrylate, styrene, and (meth) acrylonitrile.

The macromonomer may have a number average molecular weight of 2,000 to 20,000, specifically 2,000 to 10,000, and more specifically 4,000 to 8,000. Within this range, the adhesive composition can exhibit sufficient adhesive strength and good heat resistance while suppressing deterioration in workability due to an increase in the viscosity of the adhesive composition. The macromonomer may have a glass transition temperature of 40 ° C to 150 ° C, specifically 60 ° C to 140 ° C, and more specifically 80 ° C to 130 ° C. Within this range, the adhesive layer may exhibit sufficient cohesion and may suppress adhesion or adhesion deterioration.

The divalent coupling group may be C ₁ to C ₁₀ alkylene, C ₇ to C ₁₃ aryl alkylene, C ₆ to C ₁₂ alkylene, -NR ^2- (R ² is hydrogen or C ₁ to C ₅ alkyl yl) or a self-COO -, - O -, - S -, - SO 2 NH -, - NHSO 2 -, - NHCOO -, - OCONH or heterocyclic group derived.

In addition, the divalent coupling group can be represented by Formula 4a to Formula 4d:

Where * is the attachment site of the element.

Macromonomers are available from commercially available products. For example, the macromonomer may include a macromonomer in which the segment corresponding to Y is methyl methacrylate, a macromonomer in which the segment corresponding to Y is styrene, and the segment corresponding to Y is The styrene / acrylonitrile macromonomer, and the macromonomer in which the segment corresponding to Y is butyl acrylate, all said monomers have a terminal methacrylfluorenyl group.

Based on 100 parts by weight of the hydroxyl-containing (meth) acrylate and alkyl-containing (meth) acrylate, 20 parts by weight or less may be present, specifically 0.1 to 20 parts by weight, The macromonomer is in an amount of 0.1 to 10 parts by weight or 0.5 to 5 parts by weight. Within this range, the adhesive layer can achieve a balance of properties between viscoelasticity, modulus, and restoring force, and can prevent haze from increasing.

Organic nano particles may have 10 to 400 nanometers, specifically 10 to 300 nanometers, more specifically 30 to 280 nanometers, and even more specifically 50 to 280 nanometers. The average particle size of nanometers. Within this range of the average particle size, the organic nano particles do not affect the foldability of the adhesive layer, and the adhesive layer can be ensured by ensuring that the total transmittance in the visible range is about 90% or greater than 90% Has good transparency.

The difference in refractive index between the organic nanoparticle and the hydroxyl-containing (meth) acrylate may be 0.1 or less, specifically 0 to 0.05, and more specifically 0 to 0.02. Within this range, the adhesive layer may exhibit good transparency. The organic nano particles may have a refractive index of 1.35 to 1.70, specifically 1.40 to 1.60. Within this range, the adhesive layer may exhibit good transparency.

The organic nanoparticle may have a core-shell structure or a simple structure (such as a bead-type nanoparticle), but is not limited thereto. In one embodiment, the organic nanoparticle may have a core-shell structure in which the core and the shell satisfy Equation 1. That is, the organic nano particles may include nano particles in which the core and the shell are formed of an organic material. Because the organic nano-particles have a core-shell structure, the adhesive layer can exhibit good foldability and an effective balance between elasticity and flexibility.

<Equation 1> Tg (c) <Tg (s)

Tg (c) is the glass transition temperature (unit: ° C) of the core, and Tg (s) is the glass transition temperature (unit: ° C) of the shell.

As used herein, the term "shell" means the outermost layer of organic nanoparticle. Approve For spherical particles. In some embodiments, the core may include an additional layer surrounding the spherical particles as long as the core has a glass transition temperature that satisfies the above equation.

Specifically, the core may have a glass transition temperature of -150 ° C to 10 ° C, specifically -150 ° C to -5 ° C, and more specifically -150 ° C to -20 ° C. Within this range, the adhesive layer may have good viscoelasticity at low temperature and / or room temperature. The core may include at least one of poly (alkyl (meth) acrylate), polysiloxane, and polybutadiene, each having a glass transition temperature within this range.

Poly (alkyl (meth) acrylate) includes poly (methyl acrylate), poly (ethyl acrylate), poly (propyl acrylate), poly (butyl acrylate), poly (isopropyl acrylate), poly ( Hexyl acrylate), poly (hexyl methacrylate), poly (ethylhexyl acrylate), and poly (ethylhexyl methacrylate), but not limited thereto.

The polysiloxane may be, for example, an organosiloxane (co) polymer. The organosiloxane (co) polymer may be a non-crosslinked or crosslinked organosiloxane (co) polymer. Crosslinked organosiloxane (co) polymers can be used to ensure impact resistance and colorability. Specifically, the crosslinked organosiloxane (co) polymer may include crosslinked dimethylsiloxane, methylphenylsiloxane, diphenylsiloxane, and mixtures thereof. Since there are two or more kinds of copolymers of organosiloxane, the nano particles may have a refractive index of 1.41 to 1.50.

The crosslinking state of the organosiloxane (co) polymer can be determined based on the degree of dissolution in various organic solvents. As the degree of crosslinking of the organosiloxane (co) polymer increases, the degree of dissolution of the organosiloxane (co) polymer decreases. The solvent used to determine the state of crosslinking may include acetone, toluene, and the like. Specifically, organosilicon The alkane (co) polymer may have a portion that is insoluble in acetone or toluene. The organosiloxane copolymer may include about 30% or more of insolubles in toluene.

The organosiloxane (co) polymer may further include an alkyl acrylate crosslinked polymer. Alkyl acrylate crosslinked polymers may include methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, and the like. For example, the alkyl acrylate crosslinked polymer may be n-butyl acrylate or 2-ethylhexyl acrylate having a low glass transition temperature.

Specifically, the shell may have a glass transition temperature of 15 ° C to 150 ° C, specifically 35 ° C to 150 ° C, and more specifically 50 ° C to 140 ° C. Within this range, the organic nano particles can exhibit good dispersibility in the (meth) acrylic copolymer. The shell may contain poly (alkyl methacrylate) having a glass transition temperature within this range. For example, the shell may include poly (methyl methacrylate) (PMMA), poly (ethyl methacrylate), poly (propyl methacrylate), poly (butyl methacrylate) ), Poly (isopropyl methacrylate), poly (isobutyl methacrylate), and poly (cyclohexyl methacrylate), but it is not limited to this.

In the organic nanoparticle, a core may be present in an amount of 30 to 99% by weight, specifically 40 to 95% by weight, and more specifically 50 to 90% by weight. Within this range, the adhesive layer can exhibit good foldability over a wide temperature range. In the organic nanoparticle, a shell may be present in an amount of 1 to 70% by weight, specifically 5 to 60% by weight, and more specifically 10 to 50% by weight. Within this range, the adhesive layer can exhibit good foldability over a wide temperature range.

Based on 100 parts by weight of the hydroxyl-containing (meth) acrylate and the alkyl-containing (meth) acrylate, there may be 0.1 to 20 parts by weight, specifically 0.5 to 10 parts by weight, specifically The organic nano particles are in an amount of 0.5 to 8 parts by weight. Within this range, the organic nano particles can ensure the modulus of the adhesive layer at high temperature, the foldability of the adhesive layer at room temperature and high temperature, and the viscoelasticity of the adhesive layer at low temperature and / or room temperature. Aspect has good properties.

Organic nanoparticle can be prepared by typical emulsion polymerization, suspension polymerization or solution polymerization.

The adhesive composition may further include a silane coupling agent. The silane coupling agent can be a typical silane coupling agent known to those skilled in the art. For example, the silane coupling agent may include at least one selected from the group consisting of: epoxy-based silicon compounds, such as 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyl Triethoxysilane, 3-glycidoxypropylmethyldimethoxysilane and 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane; polymerizable unsaturated groups Silicon compounds, such as vinyltrimethoxysilane, vinyltriethoxysilane, and (meth) acryloxypropyltrimethoxysilane; amine-containing silicon compounds, such as 3-aminopropyltrimethoxysilane Silane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane and N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane; And 3-chloropropyltrimethoxysilane, but not limited to this. It may be present in an amount of 0.01 to 3 parts by weight, specifically 0.01 to 1 part by weight, based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate. Silane coupling agent. Within this range, the silane coupling agent ensures a curved shape under the high temperature / humidity conditions described above State of the adhesive layer, and can provide a small difference in peel strength between low temperature, room temperature and high temperature.

The adhesive composition may further include a crosslinking agent. The cross-linking agent can increase the mechanical strength of the adhesive layer by increasing the degree of cross-linking of the adhesive composition. The cross-linking agent may include a polyfunctional (meth) acrylate capable of being cured by actinic radiation. For example, the cross-linking agent may include a bifunctional (meth) acrylate (such as hexanediol diacrylate) or a trifunctional to hexafunctional (meth) acrylate. 0.001 to 5 parts by weight, specifically 0.003 to 3 parts by weight, more based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate Specifically, the crosslinking agent is in an amount of 0.005 parts by weight to 1 part by weight. Within this range, the adhesive layer exhibits good adhesion and improved reliability.

FIG. 4 illustrates a stacked structure of a base film in which a first film 110a is stacked on a second film 110b via an adhesive layer 110c. Alternatively, the base layer may be composed of at least three films such that at least two films are stacked on each other via the adhesive layer 110c.

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

5, the flexible display 300 includes a display portion 350a, an adhesive layer 360, a polarizing plate 370, a touch screen panel 380, and a flexible window film 390. The flexible window film 390 includes a flexible window film 390 according to an embodiment of the present invention. Flexible window film.

The display portion 350a is used to drive the flexible display 300, and may include a substrate And an optical device formed on the substrate. Examples of the optical device include an organic light emitting diode (OLED), a light emitting diode (LED), and a liquid crystal display (LCD) device. The display portion 350a may include a typical structure known to those skilled in the art, and may include a lower substrate, a thin film transistor, an organic light emitting diode, a planarization layer, a protective layer, and an insulating layer.

The lower substrate supports the display portion and may include a thin film transistor and an organic light emitting diode formed on the thin film transistor. The lower substrate may be formed with a flexible printed circuit board (FPCB) for driving a touch screen panel. The flexible printed circuit board may further include a timing controller, a power source, and the like to drive an array formed of an organic light emitting diode.

The lower substrate may include a substrate formed of a flexible resin. Specifically, the lower substrate 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.

In the display area of the lower substrate, a plurality of driving wires (not shown in the figure) and a plurality of sensor wires (not shown in the figure) intersecting each other define a plurality of pixel domains, and the pixel domains Each may be formed with an array formed of an organic light emitting diode, each of which includes a thin film transistor and an organic light emitting diode connected to the thin film transistor. In the non-display area of the lower substrate, a gate driver that applies an electrical signal to the driving wires may be formed in the form of a gate-in panel. The in-panel gate circuit can be formed on one or both sides of the display area.

The thin film transistor controls the current flowing through the semiconductor by applying an electric field perpendicular to the current, and can be formed on the lower substrate. Thin film transistors can include gate electrodes, A gate insulating layer, a semiconductor layer, a source electrode, and a drain electrode. The thin film transistor may be an oxide thin film transistor using an oxide such as indium gallium zinc oxide (IGZO), ZnO or TiO as a semiconductor layer, an organic thin film transistor using an organic material as a semiconductor layer, Amorphous silicon thin film transistors with crystalline silicon as the semiconductor layer or polycrystalline silicon thin film transistors with polycrystalline silicon as the semiconductor layer.

The planarization layer covers the thin film transistor and the circuit segment to planarize the upper surface of the thin film transistor and the upper surface of the circuit segment, so that an organic light emitting diode can be formed thereon. The planarization layer may be formed of, but is not limited to, a spin-on-glass (SOG) film, a polyimide polymer, or a polyacrylic acid polymer.

The organic light emitting diode achieves display by self-luminescence, and may include a first electrode, an organic light emitting layer, and a second electrode stacked in a stated order. Adjacent organic light emitting diodes can be isolated from each other by an insulating layer. The organic light emitting diode may have a bottom emission type structure in which light generated from the organic light emitting layer is emitted through the lower substrate, or a top emission type structure in which light from the organic light emitting layer is emitted through the upper substrate.

The protective layer covers the organic light emitting diode to protect the organic light emitting diode. The protective layer may be formed of an inorganic material such as SiO _x , SiN _x , SiC, SiON, SiONC, and amorphous carbon (aC), or an organic material such as (meth) acrylate, epoxy polymer, or imine polymer. Specifically, the protective layer may include an encapsulation layer in which an inorganic material layer and an organic material layer are sequentially stacked one or more times.

Referring again to FIG. 5, the adhesive layer 360 adheres the display portion 350 a to the polarizing plate 370, and may include a (meth) acrylate resin, a curing agent, an initiator, and a silane. The adhesive composition of the coupling agent is formed.

The polarizing plate 370 may achieve internal polarization or prevent external light from being reflected to achieve display, or may increase display contrast. The polarizing plate may be composed of only a polarizer. Alternatively, the polarizing plate may include a polarizer and a protective film formed on one surface or both surfaces of the polarizer. Alternatively, the polarizing plate may include a polarizer and a protective coating formed on one surface or both surfaces of the polarizer. As the polarizer, the protective film, and the protective coating, typical polarizers, typical protective films, and typical protective coatings known in the art can be used.

The touch screen panel 380 generates an electric signal by detecting a change in capacitance when a human body or a conductor (such as a stylus) touches the touch screen panel, and the display portion 350a can be driven by such an electric signal. The touch screen panel 380 is formed by patterning a flexible conductor, and may include a first sensor electrode and a first sensor electrode formed between the first sensor electrode and intersecting the first sensor electrode. Second sensor electrode. The touch screen panel 380 may include a conductive material, such as a metal nanowire, a conductive polymer, and a carbon nanotube, but is not limited thereto.

The flexible window film 390 may be provided as an outermost layer of the flexible display 300 to protect the flexible display.

Although not shown in FIG. 5, an adhesive layer may be 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 strengthen the polarizing plate. Coupling between touch screen panel and flexible window film. The adhesive layer may be formed of an adhesive composition containing a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent. As another option, The adhesive layer may include organic nano particles. Although not shown in FIG. 5, a polarizing plate may be further provided under the display portion 350 a to achieve polarization of internal light.

Next, a flexible display according to another embodiment of the present invention will be explained with reference to FIG. 6. FIG. 6 is a cross-sectional view of a flexible display according to another embodiment of the present invention.

Referring to FIG. 6, a flexible display 400 according to this embodiment includes a display portion 350a, a touch screen panel 380, a polarizing plate 370, and a flexible window film 390. The flexible window film 390 includes a flexible window film 390 according to an embodiment of the present invention. Flexible window film. The flexible display according to this embodiment is substantially the same as the flexible display according to the above embodiment, except that the touch screen panel 380 is disposed under the polarizing plate 370 instead of being directly formed on the flexible window film 390. In addition, 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 together with the display portion 350a and is formed on the display portion 350a, the flexible display according to this embodiment is thinner than the flexible display according to the above embodiment. And brighter, thus providing better visibility. In addition, the touch screen panel 380 may be formed by deposition, but is not limited thereto. Although not shown in FIG. 6, it may be between the display portion 350 a and the touch screen panel 380, between the touch screen panel 380 and the polarizing plate 370, and / or between the polarizing plate 370 and the flexible window film 390. An adhesive layer is further formed therebetween to enhance the mechanical strength of the display. The adhesive layer may be formed of an adhesive composition containing a (meth) acrylate resin, a curing agent, an initiator, and a silane coupling agent. Although not shown in FIG. 6, a polarizing plate may be further provided under the display portion 350 a to provide a good displayed image by polarizing internal light.

Next, a flexible display according to still another embodiment of the present invention will be explained with reference to FIG. 7. FIG. 7 is a cross-sectional view of a flexible display according to another embodiment of the present invention. Referring to FIG. 7, a flexible display 500 according to this embodiment includes a display portion 350 b, an adhesive layer 360, and a flexible window film 390. The flexible window film 390 includes a flexible window film according to an embodiment of the present invention. The flexible display according to this embodiment is substantially the same as the flexible display according to the one embodiment except that the flexible display can be driven only by the display portion 350b and the polarizing plate and the touch screen panel are omitted.

The display portion 350b may include a substrate and an optical device formed on the substrate. Examples of the optical device include an organic light emitting diode, a light emitting diode, a liquid crystal display device, and the like. The display portion 350b may further include a touch screen panel.

Next, a method for preparing the silicone resin of Formula 1 according to an embodiment of the present invention will be explained.

The silicone resin of Formula 1 may be prepared by: containing a silicone monomer (R ¹ SiO _3/2 ), a silicone monomer (R ² SiO _3/2 ), and a silicone monomer (R ³ SiO _3/2 ), silicone monomer (R ⁴ R ⁵ SiO _2/2 ), silicone monomer (R ⁶ R ⁷ R ⁸ SiO _1/2 ), and at least one of silicone monomer (SiO _4/2 ) The mixture of one is hydrolyzed and condensed.

The silicone monomer (R ¹ SiO _3/2 ) may be a commercially available product, or may be prepared by a typical method known to those skilled in the art. For example, a silicone can be prepared by condensing a silicon monomer having an isocyanate group (NCO) and an alkoxysilyl group with a (meth) acrylic monomer having a hydroxyl group and one (meth) acrylate group. Monomer (R ¹ SiO _3/2 ). The silicon monomer having an isocyanate group and an alkoxysilyl group may include 3-isocyanatepropyltriethoxysilane and the like. The (meth) acrylic monomer having a hydroxyl group and one (meth) acrylate group may include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (Meth) acrylates and the like. When the silicone monomer is condensed, a catalyst can be used to increase the reaction speed. For example, tin catalysts (such as dibutyltin dilaurate), amine catalysts, and the like can be used.

The silicone monomer (R ² SiO _3/2 ) can be a commercially available product or can be prepared by a typical method known to those skilled in the art. For example, it can be prepared by condensing a silicon monomer having an isocyanate group (NCO) and an alkoxysilyl group with a (meth) acrylic monomer having a hydroxyl group and at least two (meth) acrylate groups. Silicone monomer (R ² SiO _3/2 ). The silicon monomer having an isocyanate group and an alkoxysilyl group may include 3-isocyanatepropyltriethoxysilane and the like. The (meth) acrylic monomer having a hydroxyl group and at least two (meth) acrylate groups may include pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, and the like. When the silicone monomer is condensed, a catalyst such as a tin catalyst, an amine catalyst, or the like can be used.

The silicone monomer (R ³ SiO _3/2 ) may include a silicon monomer having a (meth) acrylate group, such as 3- (meth) acrylfluorenyloxypropyltrimethoxysilane, 3- (methyl) ) Acrylfluorenyloxypropyltriethoxysilane, methyltrimethoxysilane, and phenyltrimethoxysilane. The silicone monomer (R ⁴ R ⁵ SiO _2/2 ) may include dimethyldimethoxysilane and the like. The silicone monomer (R ⁶ R ⁷ R ⁸ SiO _1/2 ) may include hexamethyldisiloxane and the like. The silicone monomer (SiO _4/2 ) may include tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, and the like.

Hydrolysis and condensation of the monomer mixture can be performed by a typical method for preparing a silicone resin. The hydrolysis may include reacting the monomer mixture with water and at least one of an acid and a base. Specifically, the acid may include HCl, HNO ₃ , acetic acid, p-toluenesulfonic acid, and the like, and the base may include NaOH, KOH, and the like. The hydrolysis may be performed at 20 ° C to 100 ° C for 10 minutes to 10 hours, and the condensation may be performed at 20 ° C to 100 ° C for 10 minutes to 12 hours under the same conditions as the hydrolysis. Under these conditions, the production yield of the silicone resin can be improved.

Next, a method for preparing a silicone resin of Formula 2 according to an embodiment of the present invention will be explained.

The silicone resin of Formula 2 can be prepared by a method similar to the method of preparing the silicone resin of Formula 1.

The silicone monomer (A ³ _b SiO _{(4-b) / 2} ) may include 1H, 1H, 2H, 2H-perfluorotrimethoxysilane, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxysilane 1H, 1H, 2H, 2H-perfluorohexyltrimethoxysilane, 1H, 1H, 2H, 2H-perfluorotriethoxysilane, 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane , 1H, 1H, 2H, 2H-perfluorohexyltriethoxysilane and so on.

Silicone monomers (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) can be prepared by hydrosilylation between divinyl ether and trialkoxysilane. The divinyl ether monomer may include at least one of ethylene glycol divinyl ether, di (ethylene glycol) divinyl ether, tri (ethylene glycol) divinyl ether, and tetra (ethylene glycol) divinyl ether, and Trialkoxysilane may include at least one of triethoxysilane, trimethoxysilane, and tripropoxysilane. Silane can be performed using a typical platinum catalyst to increase the reaction speed.

Next, a method for manufacturing a window film according to an embodiment of the present invention will be explained.

The flexible window film 100 may be formed by coating and curing the composition for a window film according to the embodiment on the base layer 110.

The method for applying the composition for a window film to the base layer 110 is not particularly limited. For example, the composition for a window film may be applied to a base layer by bar coating, spin coating, dip coating, roll coating, flow coating, or die coating, but is not limited thereto. The composition for a window film may be coated on the base layer 110 to a thickness of 5 to 100 microns. Within this thickness range, it can provide good hardness, flexibility and reliability while ensuring that the desired coating is obtained. The curing is performed to form a coating by curing a composition for a window film, and the curing may include light curing. Photocuring may include irradiating the coated composition at a wavelength of 400 nm or less at a dose of 10 mJ / cm2 to 1,000 mJ / cm2. Under these conditions, the composition for a window film can be sufficiently cured. As such, the composition for a window film according to the present invention provides a window film having sufficient hardness by photo-curing without additional heat treatment or aging after photo-curing, thereby improving processability. Before curing the composition for a window film applied to the base layer 110, the method may further include drying the composition. When curing is performed after drying, it is possible to prevent an increase in the surface roughness of the coating layer due to the light curing for a long period of time. Drying may be performed at 40 ° C to 200 ° C for 1 minute to 30 hours, but is not limited thereto.

Hereinafter, the present invention will be explained in more detail with reference to some examples. It should be understood that these examples are provided for illustration only and should not be taken as limiting the invention in any way.

Preparation Example 1: First silicone resin

It will contain 1.0 equivalent of 3-isocyanatopropyltriethoxysilane (KBE-9007, Shin-Etsu Co., Ltd.), 0.9 equivalent of 2-hydroxyethyl acrylate (antimony Greek Ltd. (TCI Co., Ltd.), and 0.1 equivalents of pentaerythritol triacrylate (Sigma-Aldrich Co., Ltd.) monomer mixture 100 g, 0.3 g of dilauric Dibutyltin acid (Sigma-Aldrich Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask. The components were stirred at room temperature for 5 hours, and then 20 g of a 0.1 N aqueous HCl solution was added to the mixture. The resulting mixture was stirred at 50 ° C for 8 hours. Then, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the water layer was removed by stirring and sinking, and this process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Ltd.) was added to the organic layer, and then the solvent was removed from the organic layer using a vacuum distillation apparatus so that the prepared silicone resin had a 90% Solid content. Silicone resin ((X ₁ -Ety-O- (C = O) NH-Pry) SiO _3/2 ) _0.9 ((Z ₁ -O- (C = O) NH-Pry) SiO _3/2 ) _0.1 has A weight average molecular weight of about 3,000 g / mol measured by gel permeation chromatography (GPC).

Preparation Example 2: First silicone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatopropyltriethoxysilane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (Antimony Co. Ltd.) 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask. The components were stirred at room temperature for 5 hours, and then 20 g of a 0.1 N aqueous HCl solution was added to the mixture. The resulting mixture was stirred at 50 ° C for 8 hours. Then, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the water layer was removed by stirring and sinking, and this process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Ltd.) was added to the organic layer, and then the solvent was removed from the organic layer using a vacuum distillation apparatus so that the prepared silicone resin had a 90% Solid content. The silicone resin ((X ₁ -Ety-O- (C = O) NH-Pry) SiO _3/2 ) has a weight of about 3,000 g / mole measured by gel permeation chromatography (GPC) Average molecular weight.

Preparation Example 3: Second silicone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatopropyltriethoxysilane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (Antimony Co., Ltd.), 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask. The components were stirred at room temperature for 5 hours, and then 0.05 equivalent of 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane was added to the mixture (Sigma-Aldrich Ltd. ) And 20 grams of 0.1N aqueous HCl. The resulting mixture was stirred at 50 ° C for 8 hours. Then, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the water layer was removed by stirring and sinking, and this process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Ltd.) was added to the organic layer, and then the solvent was removed from the organic layer using a vacuum distillation apparatus so that the prepared silicone resin had a 90% Solid content. Silicone resin ((X ₁ -Ety-O- (C = O) NH-Pry) SiO _3/2 ) _0.95 (FdSiO _3/2 ) _0.05 has been measured by gel permeation chromatography (GPC) Weight average molecular weight of about 3,000 grams / mole.

Preparation Example 4: Second silicone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatopropyltriethoxysilane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (Antimony Co. Ltd.) 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Co., Ltd.) and 100 g of toluene were placed in a 500-ml 3-necked flask, and then stirred at room temperature for 5 hours, thereby preparing a reaction solution X.

In a 250 ml flask, 35 millimoles of tris (ethylene glycol) divinyl ether (Audrich), toluene, and 150 ppm of platinum catalyst (PT-CS-1.8CS, especially beautiful) under a nitrogen atmosphere. (Umicore). To the mixture was added 70 millimoles of triethoxysilane, followed by stirring at 45 ° C for 2 hours. Next, the platinum catalyst was removed using activated carbon, thereby preparing a reaction product Y.

0.05 equivalent of the reaction product Y and 20 g of a 0.1 N aqueous HCl solution were added to the reaction solution X. The resulting mixture was stirred at 50 ° C for 8 hours. Then, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the water layer was removed by stirring and sinking, and this process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Ltd.) was added to the organic layer, and then the solvent was removed from the organic layer using a vacuum distillation apparatus so that the prepared silicone resin had a 90% Solid content. Silicone resin ((X ₁ -Ety-O- (C = O) NH-Pry) SiO _3/2 ) _0.95 (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _{3 / 2} ) _0.05 has a weight average molecular weight of about 3,000 g / mole as measured by gel permeation chromatography (GPC).

Details of the components used in the following examples and comparative examples are as follows.

(A) First silicone resin: (A1) Preparation Example 1, (A2) Preparation Example 2

(B) Second silicone resin: (B1) Preparation Example 3, (B2) Preparation Example 4

(C) Crosslinking agent: (C1) SR-499 (Sartomer Co., Ltd.), (C2) SR-502 (Sadomer Co., Ltd.)

(D) Nano particles: SST-550U (containing silicon dioxide, solid content: 50% by weight, Ranco Co., Ltd.)

(E) Starter: Irgacure 184 (Ciba Co., Ltd.)

(F) Organic binder: Silicone-free urethane acrylate resin (CHTU-9607, Chamton Co., Ltd)

Example 1

The first silicone resin, the second silicone resin, the cross-linking agent, and the initiator were mixed in a weight part listed in Table 1 to have a total weight of 5.0 g, and 5.0 g of formazan was added to the mixture. Ethyl ketone, whereby a composition for a window film is prepared.

The prepared composition for a window film was coated on a polyimide film (PI film, thickness: 80 micrometers, Samsung SDI Co., Ltd.) at 80 ° C. It was dried for 4 minutes, and irradiated with 500 mJ / cm2 under ultraviolet light under a nitrogen atmosphere, thereby forming a window film having a coating layer with a thickness of 10 micrometers on it.

Example 2, Example 3, and Example 5

A window film was prepared in the same manner as in Example 1 except that the kind and amount of the silicone resin were changed as listed in Table 1.

Example 4

A window film was prepared in the same manner as in Example 1 except that the kind and amount of the silicone resin and the nano particles (in terms of solid content) were changed as listed in Table 1.

Comparative Example 1 and Comparative Example 2

Except that the kind and amount of the silicone resin were changed as listed in Table 1, each window film was prepared in the same manner as in Example 1.

Reference example 1

A window film was prepared in the same manner as in Example 1 except that the kind and amount of the silicone resin were changed as listed in Table 1.

Each of the window films prepared in the examples and comparative examples was evaluated for the following properties, and the evaluation results are shown in Table 2.

(1) Scratch resistance (abrasion test): A point (diameter: 11 mm) containing steel wool (Libe Steel Wool # 0000) was placed on a window coating of a window film, and was 1.5 kg by a wear tester At a speed of 60 mm / sec. This process was repeated 10 times, and the number of scratches on the window coating was observed. A smaller number of scratches indicates better scratch resistance. A window film having one scratch or less is rated as a suitable window film.

(2) Curvature radius: The window film (width × length, 3 cm × 15 cm) is wound on a fixture (CFT-200R, Covotech Co., Ltd.) for measuring the radius of curvature , Keep winding for 5 seconds or more, unwind it, and then observe with the naked eye to determine whether the window film has cracks. Here, the radius of curvature in the stretching direction was measured by winding the window film on a jig so that the base layer of the window film contacted the jig. The radius of curvature is determined as the minimum radius of a fixture that does not cause cracks in the window film while gradually reducing the diameter of the fixture from the fixture having the largest diameter.

(3) Reflected image quality: Reflected image quality was measured at 16 points on the window coating of the window film using Lopuan IQ (Lopuan Co., Ltd.). An average value was obtained by averaging the obtained values by excluding two minimum values and two maximum values, and the average value was defined as the reflected image quality. The higher the quality of the reflected image, the better the surface quality of the window coating.

(4) Pencil hardness: A pencil hardness tester (Heidon) was used to measure the pencil hardness on the coating of a window film according to Japanese Industrial Standards (JIS) K5400. Use 6B to 9H Pencil (Mitsubishi Co., Ltd.) The pencil hardness on the coating was measured with a pencil load of 1 kg, a scraping angle of 45 °, and a scraping speed of 60 mm / min. . When the coating has one or more scratches after 5 tests with a certain pencil, the pencil hardness is measured again using another pencil whose pencil hardness is one level lower than the previous pencil. The pencil hardness value such that no scratch was observed on all five times on the coating was regarded as the pencil hardness of the coating.

(5) Impact resistance (pen drop test): By bonding an adhesive film (thickness: 50 microns, OCA 8146, 3M Corporation) to each of the window films of the examples and comparative examples, Make sure that you get a window film so that the window coating is placed on the uppermost side of a polyethylene terephthalate (PET) film (thickness: 2,500 microns, Mitsubishi Corporation). Next, a sample was prepared by sequentially stacking an aluminum foil and a stainless steel sheet (SUS sheet) on the lower surface of the polyethylene terephthalate film. Next, by making a pen having a weight of 5.8 grams and a ball diameter of 0.7 mm fall at a predetermined height from the window coating of the sample, a mark observable with the naked eye was formed on the surface of the aluminum foil and the surface of the window coating The initial height was measured. This process was repeated five times and an average was obtained. A higher initial height indicates a higher impact resistance of the window film. In the pen drop test, an initial height of 4.5 cm or more means that the window film will not be damaged by the impact generated when the organic light emitting diode panel is mounted on the window film.

As shown in Table 2, the flexible window film of the example has good properties in terms of scratch resistance, surface quality, pencil hardness, and impact resistance, and shows good flexibility when folded in the direction of the base layer. Sex. In addition, the flexible window film of Example 6 including the film stacked structure showed much better impact resistance than the flexible window film of Example 1.

In contrast, the window films of Comparative Examples 1 and 2 that contained neither the first silicone resin of the present invention nor the second silicone resin exhibited poor properties in terms of scratch resistance, surface quality, and hardness. The window film of Reference Example 1 not containing the second silicone resin according to the present invention exhibited poor surface quality.

It should be understood that those skilled in the art can make various modifications, changes, alterations and equivalent embodiments without departing from the spirit and scope of the present invention.

Claims (27)

A composition for a window film, comprising: a first silicone resin represented by Formula 1; a second silicone resin represented by Formula 2; 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 (R ⁴ R ⁵ SiO _2/2 ) _w (R ⁶ R ⁷ R ⁸ SiO _1/2 ) _u (SiO _{4 / 2} ) _v wherein R ¹ is a monovalent organic group containing one (meth) acrylate group and at least one urethane group; R ² is a group containing at least two (meth) acrylate groups and at least one amine group A monovalent organic group of a formate group; R ³ is a non-urethane-based monovalent organic group containing at least one (meth) acrylate group, an unsubstituted or substituted C ₁ to C ₂₀ alkyl group, Substituted or substituted C ₅ to C ₂₀ cycloalkyl or unsubstituted or substituted C ₆ to C ₃₀ aryl; R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently hydrogen, A monovalent organic group containing at least one (meth) acrylate group, an unsubstituted or substituted C ₁ to C ₂₀ alkyl group, an unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl group, or an unsubstituted or substituted Substituted C ₆ to C ₃₀ aryl; and 0 x 1,0 y 1,0 z <1,0 w <1,0 u <1,0 v <1, x + y ≠ 0, and x + y + z + w + u + v = 1, <Formula 2> (R ¹¹ SiO _3/2 ) _x (A ³ _b SiO _{(4-b) / 2} ) _y1 (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) _y2 (R ¹² SiO _3/2 ) _z (R ¹³ R ¹⁴ SiO _2/2 ) _w (R ¹⁵ R ¹⁶ R ¹⁷ SiO _1/2 ) _u (SiO _4/2 ) _v wherein R ¹¹ is a monovalent organic group containing one (meth) acrylate group and at least one urethane group or a group containing one (meth) acrylate group Non-urethane-based monovalent organic groups; R ¹² is unsubstituted or substituted C ₁ to C ₂₀ alkyl, unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl, or unsubstituted or substituted Substituted C ₆ to C ₃₀ aryl groups; R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ and R ¹⁷ are each independently hydrogen, a monovalent organic group containing at least one (meth) acrylate group, unsubstituted or A substituted C ₁ to C ₂₀ alkyl group, an unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl group, or an unsubstituted or substituted C ₆ to C ₃₀ aryl group; A ³ is an alkyl group containing at least one fluorine Substituted or unsubstituted C ₁ to C ₃₀ alkyl, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl, or substituted or unsubstituted containing at least one fluorine C ₆ to C ₂₀ aryl; b is an integer from 1 to 3; A ¹ and A ² are each independently a single bond or substituted or unsubstituted C ₁ to C ₅ alkylene; T ¹ is a single epoxy Alkyl or polyalkylene oxide; and 0 <x <1,0 <y1 + y2 <1,0 y1 <1,0 y2 <1,0 z <1,0 w <1,0 u <1,0 v <1, and x + y1 + y2 + z + w + u + v = 1. The composition for a window film according to item 1 of the scope of patent application, wherein the first silicone resin of Formula 1 includes a T unit and a T unit as represented by Formula 1-1: <Formula 1-1> (R ¹ SiO _3/2 ) _x (R ² SiO _3/2 ) _y wherein R ¹ and R ² are the same as defined in Formula 1; and 0 <x <1, 0 <y <1, and x + y = 1. The composition for a window film as described in item 2 of the scope of patent application, wherein x and y are set to satisfy 0.80 x 0.99, 0.01 y 0.20, and x + y = 1. The composition for a window film according to item 1 of the scope of patent application, wherein the first silicone resin of Formula 1 includes a T unit as represented by Formula 1-2: <Form 1-2> (R ¹ SiO _3/2 ) _x where R ¹ is the same as defined in Formula 1; and x is 1. The composition for a window film according to item 1 of the scope of patent application, wherein the first silicone resin is composed of Formula 1-1-1 to Formula 1-1-10 and Formula 1-2-1 to Formula 1 One of -2-3 means: <Formula 1-1-1> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-2> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-3> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-4> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-5> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-6> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x ((WO- (C = O) NH-Pry) SiO _3/2 ) _y where Ety is ethylene, Pry is propyl, Buty is butyl, X is (meth) acrylate, Z is represented by Formula A, and W is represented by Formula D Means: Where * is the attachment site and X is a (meth) acrylate group, Where * is the attachment site; X is a (meth) acrylate group; and 0 <x <1, 0 <y <1, and x + y = 1, <Formula 1-1-7> ((X-Ety -O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x2 ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-8> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Pry-O- ( C = O) NH-Pry) SiO _3/2 ) _x2 ((ZO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-9> ((X-Ety-O- ( C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x2 ((WO- (C = O) NH-Pry) SiO _3/2 ) _y <Formula 1-1-10> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x1 ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x2 ((WO- (C = O) NH-Pry) SiO _3/2 ) _y where Ety is ethylene, Pry is ethylene, Buty is ethylene, X is (Meth) acrylate group, Z is represented by Formula A, and W is represented by Formula D: <Formula A> Where * is the attachment site and X is a (meth) acrylate group, Where * is the attachment site and X is a (meth) acrylate group; and 0 <x1 <1, 0 <x2 <1, 0 <y <1, and X1 + x2 + y = 1, <Formula 1-2 -1> ((X-Ety-O- (C = O) -NH-Pry) SiO _3/2 ) <Formula 1-2-2> ((X-Buty-O- (C = O) NH-Pry ) SiO _3/2 ) <Formula 1-2-3> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) where Ety is ethylene, Pry is ethylene, Buty Is a butyl group, and X is a (meth) acrylate group. The composition for a window film according to item 1 of the scope of patent application, wherein the second silicone resin includes a silicone resin represented by Formula 2-1: <Formula 2-1> (R ¹¹ SiO _{3 / 2} ) _x (A ³ _b SiO _{(4-b) / 2} ) _y1 (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) _y2 where R ¹¹ , A ³ , A ¹ , A ² , T ¹ and b are the same as defined in Equation 2; and 0 <x <1,0 <y1 + y2 <1,0 y1 <1,0 y2 <1, and x + y1 + y2 = 1. The composition for a window film according to item 6 of the scope of patent application, wherein the second silicone resin includes a silicone resin represented by Formula 2-1-1 to Formula 2--9: <Formula 2 -1-1> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x (FdSiO _3/2 ) _y1 <Formula 2-1-2> ((X-Ety-O -(C = O) NH-Pry) SiO _3/2 ) _x (FoSiO _3/2 ) _y1 <Formula 2-1-3> ((X-Buty-O- (C = O) NH-Pry) SiO _{3 / 2} ) _x (FdSiO _3/2 ) _y1 <Formula 2-1-4> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x (FoSiO _3/2 ) _y1 < Formula 2-1-5> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x (FdSiO _3/2 ) _y1 <Formula 2-1-6> ((X-Pry -O- (C = O) NH-Pry) SiO _3/2 ) _x (FoSiO _3/2 ) _y1 where Ety is ethylene, Pry is propyl, Buty is butyl, and X is (methyl) Acrylate, Fd represents 1H, 1H, 2H, 2H-perfluorodecyl, and Fo is 1H, 1H, 2H, 2H-perfluorooctyl; and 0 <x <1, 0 <y1 <1, and x + y1 = 1, <Formula 2-1-7> ((X-Ety-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2 <Formula 2-1-8> ((X-Buty-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2- C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2 <Formula 2-1-9> ((X-Pry-O- (C = O) NH-Pry) SiO _3/2 ) _x (SiO _3/2 -C ₂ H ₄ -[-OC ₂ H _4- ] ₄ -SiO _3/2 ) _y2 where Ety is Ethyl, Pry is propyl, Buty is butyl, and X is a (meth) acrylate group; and 0 <x <1, 0 <y2 <1, and x + y2 = 1. The composition for a window film according to item 6 of the scope of patent application, wherein, in Formula 2-1, x, y1, and y ₂ are set to satisfy 0.85 x 0.99, 0.01 y1 0.15, and y2 = 0, or 0.85 x 0.99, 0.01 y2 0.15, and y1 = 0. The composition for a window film according to item 1 of the scope of patent application, wherein the crosslinking agent comprises a (meth) acrylate monomer. The composition for a window film according to item 8 of the scope of patent application, wherein 100 parts by weight of the first silicone resin of the formula 1, the second silicone resin of the formula 2, and the cross-linking The first silicone resin of the formula 1 is present in an amount of 10 to 80 parts by weight, the second silicone resin of the formula 2 is present in an amount of 0.1 to 50 parts by weight, and 1 is present. The crosslinking agent is in an amount of 50 parts by weight to 50 parts by weight. The composition for a window film according to item 1 of the scope of patent application, further comprising: nano particles. The composition for a window film according to item 11 of the scope of patent application, wherein the nano particles are surface-treated with a (meth) acrylate group. The composition for a window film according to item 11 of the scope of patent application, wherein at least a part of the first silicone resin of Formula 1 is coupled to the nano particles to form a composite. The composition for a window film according to item 11 of the scope of patent application, wherein the nano particles have an average particle diameter (D50) of 100 nm or less. The composition for a window film according to item 11 of the scope of patent application, wherein the nano particles include silicon dioxide. The composition for a window film according to item 1 of the scope of patent application, further comprising: an alicyclic epoxy resin having an epoxy group. The composition for a window film according to item 1 of the scope of patent application, further comprising at least one of the following: ultraviolet absorbers, reaction inhibitors, adhesion promoters, thixotropic agents, conductivity imparting agents, and colors Regulators, stabilizers, antistatic agents, antioxidants, leveling agents, anti-fingerprint agents and surface energy regulators. A flexible window film includes: a base layer; and a coating layer formed on the base layer, wherein the coating layer is used as described in any one of claims 1 to 17 of a patent application range. For forming a composition for a window film, wherein the flexible window film has a pencil hardness of 3H or higher, a radius of curvature of 5.0 mm or less in a stretching direction, and a warp of 90 or more Reflected Image Quality (RIQ) value. The flexible window film according to claim 18, wherein the base layer includes a film stack structure including at least two films stacked on top of each other via an adhesive layer. The flexible window film according to item 18 of the scope of patent application, wherein the film stack structure includes a first film, a second film, and the adhesive layer, and the adhesive layer is sandwiched between the first film And the second film so that the first film is stacked on the second film via the adhesive layer. The flexible window film according to claim 20, wherein each of the first film and the second film is selected from a polyester resin, a polycarbonate resin, and a polyimide. At least one of a resin, a poly (meth) acrylate resin, and a cyclic olefin polymer resin is formed. The flexible window film according to item 19 of the scope of patent application, wherein the adhesive layer is formed of an adhesive composition containing the following components: a monomer mixture of a hydroxyl-containing (meth) acrylic copolymer; An initiator; and at least one of a macromonomer and an organic nanoparticle. According to the flexible window film according to item 22 of the application, the monomer mixture includes a hydroxyl group-containing (meth) acrylate and an alkyl group-containing (meth) acrylate. The flexible window film according to item 23 of the application, wherein the monomer mixture further comprises a comonomer. The flexible window film according to item 22 of the scope of patent application, wherein the organic nano particles include nano particles satisfying the core-shell structure of Equation 1: Tg (c) <Tg (s) where Tg (c) Is the glass transition temperature of the core (unit: ° C), and Tg (s) is the glass transition temperature of the shell (unit: ° C). The flexible window film according to item 22 of the scope of patent application, wherein the organic nano particles have an average particle diameter of 10 to 400 nanometers. The flexible window film according to item 20 of the patent application scope, wherein each of the first film and the second film has a thickness of 10 to 100 micrometers, and the adhesive layer has 10 Micron to 75 micron thickness.