TW201821545A - Composition for window film and flexible window film prepared using the same - Google Patents

Abstract

A composition for window films comprising a first silicone resin represented by Formula 1, a second silicone resin represented by Formula 2, a crosslinking agent and an initiator, and a flexible window film formed therefrom are provided.

Description

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

The present invention relates to a composition for a window film and a flexible window film formed from the composition for the 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 folding or unfolding has been developed in the prior art. The flexible display is light and thin, has 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 a flexible display, the window film is required to be well folded toward the substrate layer or coating. In particular, a well-folded window film toward the substrate layer allows the image displayed on the display to be seen not only by a single viewer but also by a plurality of viewers, thus being folded compared to the coating Better usability for window film.

The window film is placed at the outermost side of the display. Therefore, the window film having low scratch resistance can be easily scratched, thereby deteriorating the quality of the screen. Specifically, the fine scratches generated by the user's hands or the like can cause not only deterioration of the screen quality but also deterioration of the appearance.

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

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

It is an object of the present invention to provide a composition for a window film which achieves good scratch resistance and which exhibits good folding in any folding direction when folded toward the substrate layer or coating. Flexible window film.

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

It is still another object of the present invention to provide a composition for a window film which can achieve a flexible window film having a high hardness.

It is still another object of the present invention to provide a composition for a window film which can be formed into a window film by ultraviolet (UV) curing without a separate heat treatment and / or aging to avoid the degree of curing due to the surrounding environment such as temperature or humidity, thereby improving workability.

It is still another object of the present invention 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 comprising a coating formed from a composition for a window film in accordance with the present invention.

According to an aspect of the invention, a composition for a window film may comprise a first fluorenone resin represented by Formula 1, a second fluorenone resin represented by Formula 1, a crosslinking agent, and a starter: 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 , R ² , R ³ , R ⁴ , R ⁵ , R ⁶ , R ⁷ , R ⁸ , x, y, z, w, u and v The same as defined in the following detailed description of the 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 (wherein 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 are as defined in the following detailed description of the invention the same).

In accordance with another aspect of the present invention, a flexible window film includes: a base layer; and a coating 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 achieves good scratch resistance and exhibits good flexibility in any folding direction when folded toward a substrate layer or coating. Window film.

The present invention provides a composition for a window film that achieves 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 present invention provides a composition for a window film which can form a window film after UV curing without the need for separate heat treatment and/or aging to avoid, for example, temperature or humidity The surrounding environment affects the degree of curing, thereby improving workability.

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 comprising a coating formed from a composition for a window film in accordance with the present invention.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the present invention is not limited to the following embodiments, but may be embodied in different ways. In the drawings, parts not related to the description will be omitted for clarity. Throughout the specification, the same components will be denoted by the same reference numerals.

In this paper, spatially relative terms such as "upper" and "lower" are defined by reference schema. Therefore, it should be understood that the term "upper surface" can be 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 can be placed directly on the other element or the intermediate element can be present. On the other hand, when an element is referred to as being "directly" placed on the other element, there is no intermediate element between the element and the other element.

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

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

As used herein, "alkoxy" means an alkyl-O-alkylene group.

As used herein, "halogen" means fluoro, chloro, bromo or iodo.

In this context, "Me" is methyl, "Ph" is phenyl, "Et" is ethyl, "Ety" is ethyl, "Pry" is propyl, "Buty" is butyl, "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 a linking site), and "X" is a (meth) acrylate group.

Herein, "Z", "Z ₁ ", and "Z ₂ " are portions of the compound represented by Formula A, Formula B, and Formula C, respectively, and are derived from pentaerythritol tri(meth)acrylate: A> (where * is the connection site) <Form B> (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: <Formula D> (where * is the connection site).

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

Herein, "monoepoxyalkyl or polyalkylene oxide" is *-[-O-R ^a -]n-[-O- R ^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 alkyl group, n is an integer of 1 to 5, and m is an integer of 0 to 5.

Herein, "Ec" is 2-(3,4-epoxycyclohexyl)ethyl.

As used herein, "reflected image quality (RIQ)" refers to a measure 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 range from 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, ie the better the surface quality.

In this context, the term "modulo" refers to the use of the dynamic viscoelastic instrument ARES (MCR-501, Anton Paar Co., Ltd.) at 1 rad/sec under automatic strain conditions. The shear modulus and the measured storage modulus at 1% strain. The 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 raised from -60 ° C to 90 ° C at a rate of 5 ° C / min, and the modulus was measured at -20 ° C, 25 ° C and 80 ° C.

Herein, the term "average particle diameter" of the organic nanoparticle means the use of a Zetasizer nano-ZS (Malvern Co., Ltd.) in an aqueous solvent or an organic solvent. The z average particle diameter of the confirmed nanoparticles was observed by a scanning electron microscope (SEM)/transmission electron microscope (TEM).

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 fluorenone resin, a second fluorenone resin, a crosslinking agent, and an initiator.

The first fluorenone resin and the second fluorenone resin will be explained in more detail. The first fluorenone resin comprises at least one first repeating unit comprising a urethane group (urethane bond) and at least one photoreactive functional group. The second fluorenone resin comprises at least one first repeating unit containing at least one photoreactive functional group and at least one second repeating unit containing a fluorine or an alkylene oxide group. In one embodiment, the photoreactive functional group is a free radical reactive functional group (eg, a photocurable 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 comprising a substrate layer and a window coating formed from the composition for the window film, and when applied to the substrate layer or window The layer exhibits good foldability in any folding direction when folded. In particular, the composition for the window film can achieve a window film that can be folded not only well toward the coating but also well folded toward the substrate layer so that multiple viewers can see at the same time An image displayed on the display to increase 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 be broken. In addition, the composition for a window film according to the present embodiment can achieve a window film having high hardness and low curl and exhibiting good impact resistance.

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

Further, the composition for a window film according to the present embodiment comprises a first fluorenone resin and a second fluorenone resin so that a window film can be formed after ultraviolet curing without a separate heat treatment and/or aging and no cause For example, the surrounding environment such as temperature and humidity affects the degree of curing, thereby improving workability. In general, a composition for a window film containing an anthrone resin containing an epoxy group (for example, an alicyclic epoxy group) needs to be subjected to an aging treatment after ultraviolet curing at the time of forming a window coating.

Each of the first fluorenone resin and the second fluorenone resin may be independently provided for the composition for the window film. Alternatively, each of the first fluorenone resin and the second fluorenone resin may be provided in the form of a composite of the first fluorenone resin or the second fluorenone resin bonded to the inorganic particles or the organic particles. This structure will be 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 the present embodiment may include a first fluorenone resin represented by Formula 1, a second fluorenone resin represented by Formula 2, a crosslinking agent, and a starter.

First, the anthrone resin represented by Formula 1 will be explained. The fluorenone resin represented by Formula 1 can improve the hardness, flexibility, scratch resistance and impact resistance of the window film.

<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 at least two (methyl group) a monovalent organic group of an acrylate group and at least one urethane group; R ³ is a non-carbamate-based monovalent organic group containing at least one (meth) acrylate group, 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 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 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 can 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 independently a substituted or unsubstituted C ₁ to C ₂₀ alkyl, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl or substituted or unsubstituted C ₆ to C ₂₀ extended aryl; 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 alkyl group, more preferably a substituted or unsubstituted C ₁ to C ₅ alkyl group, for example Methylene, ethyl, propyl, butyl or pentyl. For example, R ¹ may be a monovalent organic group having one terminal (meth) acrylate group therein and 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 can 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 alkyl, substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl or substituted or unsubstituted C ₆ to C ₂₀ extended aryl; Y ₄ is Substituted or unsubstituted branched chain C ₃ to C ₂₀ alkyl; substituted or unsubstituted branched C ₃ to C ₂₀ alkyloxy; C ₅ to C ₂₀ cycloalkyl, substituted Or unsubstituted branched C ₃ to C ₂₀ alkyl or substituted or unsubstituted branched C ₃ to C ₂₀ alkyloxy; or C ₆ to C ₂₀ extended aryl containing substituted or unsubstituted Substituted branched C ₃ to C ₂₀ alkyl or substituted or unsubstituted branched C ₃ to C ₂₀ alkoxy; X is a (meth) acrylate group; and n is 2 or greater Integer).

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

Preferably, Y ₄ is a substituted or unsubstituted branched C ₃ to C ₂₀ alkyl 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-carbamate-based monovalent organic group having no urethane group and having 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 a linking site; Y ₅ 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 ₂₀ extended aryl group; X is a (meth) acrylate group; and n is 1 or more An integer of 1).

Preferably, Y ₅ is a substituted or unsubstituted C ₁ to C ₅ alkyl group, such as methylene, ethyl, propyl, butyl or pentyl. 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, a 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, the monovalent organic group containing at least one (meth) acrylate group may be represented by the above formula i, formula ii or formula iii. Preferably, R ⁴ , R ⁵ , R ⁶ , R ⁷ and R ⁸ are each independently a substituted or unsubstituted C ₁ to C ₅ alkyl group, for example, 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 ), (R ⁶ R ⁷ ) may be contained. Each of R ⁸ SiO _1/2 ) and (SiO _4/2 ) serves as two or more different units. For example, when the fluorenone 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 is} different from each other, and 0 < x1 < 1, 0 < x2 < 1, 0 < y < 1, and x1 + x2 + y = 1) may also fall within the scope of the present invention.

In one embodiment, the fluorenone resin of Formula 1 may be an fluorenone resin composed of 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).

Specifically, in Formula 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

For example, the fluorenone resin of Formula 1-1 may include an fluorenone resin represented by Formula 1-1-1 to Formula 1-1-10: <Form 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 the formula 1-1-1 to the formula 1-1-6, x and y may be the same as those in the chemical formula 1. Within this range, the composition for the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

In the formula 1-1-7 to the formula 1-1-1, 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

In another embodiment, the fluorenone resin of Formula 1 may be an fluorenone 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 fluorenone resin represented by Formula 1-2 may include an fluorenone resin represented by Formula 1-2-1 to Formula 1-2-3: <Form 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 ) <Form 1- 2-3> ((X-Pry-O-(C=O)NH-Pry)SiO _3/2 ).

In still another embodiment, the fluorenone resin of Formula 1 may be an fluorenone resin composed of a T unit, a T unit, and a T unit 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 (wherein 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 Formula 1-3, x, y, and z may 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 Is 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

For example, the fluorenone resin of Formula 1-3 may include an fluorenone 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 <Form 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 <Forms 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 <Forms 1-3-4> ((X-Ety-O-(C=O)NH-Pry)SiO _3/2 ) _x ((ZO-(C=O)NH-Pry)SiO _3/2 ) _y (MeSiO _3/2 ) _z <Forms 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 <Form 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 fluorenone resin of Formula 1 may be an fluorenone resin composed of a T unit, a T unit, and a D unit 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 (wherein 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 Formula 1-4, x, y, and w may 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 It is 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

In another embodiment, the fluorenone resin of Formula 1 may be an fluorenone resin composed of a T unit, a T unit, and an M unit 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 (wherein 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 Formula 1-5, x, y, and u may 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 It is 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

In another embodiment, the fluorenone resin of Formula 1 may be an fluorenone resin composed of a T unit, a T unit, and a Q unit 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 (wherein R ¹ and R ² are the same as those defined in Formula 1; and 0 < x < 1, 0 < y < 1, 0 <v<1, and x+y+v=1).

Specifically, in Formula 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 It is 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 the window film provides good properties for the window film in terms of scratch resistance, hardness and impact resistance, and ensures that the window film is when the window film is folded toward the substrate layer or window coating. Good flexibility in any folding direction.

The fluorenone resin of Formula 1 may have from 1,000 g/mol to 20,000 g/mol, specifically from 1,500 g/mol to 10,000 g/mol, more specifically from 2,000 g/m to 6,000 g/ The weight average molecular weight of the mole. Within this range, the composition for the window film can improve the appearance and transparency of the window film. The fluorenone 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 ensures stable coating properties.

10 parts by weight to 80 parts by weight, specifically 20 parts by weight to 80 parts by weight, 30 parts by weight to 80 parts by weight based on 100 parts by weight of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and the crosslinking agent The fluorenone 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 the window film provides good properties to the window film in terms of scratch resistance, flexibility, hardness, and impact resistance.

Next, the anthrone 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 at least one (methyl)) a monovalent organic group of an acrylate group and at least one urethane group, or a non-carbamate type 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, an unsubstituted or substituted C ₅ to C ₂₀ cycloalkyl, or unsubstituted or substituted C ₆ to C ₃₀ aryl; A ³ is a substituted or unsubstituted C ₁ to C ₃₀ alkyl group containing at least one fluorine, containing at least one fluorine Substituted or unsubstituted C ₅ to C ₂₀ cycloalkyl, or substituted or unsubstituted C containing at least one fluorine 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 a substituted or unsubstituted C ₁ to C ₅ alkyl; T ¹ is a monoalkylene oxide 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).

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

Specifically, A ³ may be a C ₁ to C ₁₀ fluoroalkyl group, a C ₁ to C ₁₀ perfluoroalkyl group, a C ₁ to C ₁₀ alkyl group having a C ₁ to C ₁₀ fluoroalkyl group or having a C ₁ to C A C ₁ to C ₁₀ alkyl group of ₁₀ perfluoroalkyl groups. 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, an extended ethyl group, a n-propyl group, an exo-propyl group, a 1,2-butylene group, a 1,3-butylene group, and a 1,4-extension. Butyl or 2,3-butylene.

Specifically, T ¹ may be *-[-OC ₂ H ₄ -] _n -* (* is a linking site).

In one embodiment, the fluorenone resin of Formula 2 can 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 (wherein 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 Formula 2-1, x, y1, and y2 may 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 fluorenone resin of Formula 2-1 may include an fluorenone 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 <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 2-6-1> ((X-Pry-O-(C=O)NH-Pry)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 fluorenone resin of Formula 2 may have from 1,000 g/m to 20,000 g/mole, specifically from 1,500 g/m to 10,000 g/mole, more specifically from 2,000 g/m to 6,000 g/ The weight average molecular weight of the mole. Within this range, the composition for the window film can improve the appearance and transparency of the window film. The fluorenone 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 ensures stable coating properties.

0.1 parts by weight to 50 parts by weight, specifically 0.1 parts by weight to 40 parts by weight, and 0.1 parts by weight, based on 100 parts by weight of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and a crosslinking agent The indolinone resin of Formula 2 is used in an amount of 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 part 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 fluorenone resin of Formula 1 and the fluorenone resin of Formula 2, thereby further improving the hardness and flexibility of the window film. The crosslinking agent may comprise a monomer containing at least one, preferably at least two, for example 2 to 15, radically reactive functional groups. The radical reactive functional group may be a (meth) acrylate group.

The (meth) acrylate monomer may include a difunctional (meth) acrylate such as 1,4-butanediol di(meth) acrylate, 1,6-hexane diol di(meth) acrylate, Neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl adipate di(meth)acrylate, dicyclopentyl di(meth)acrylate Ester, caprolactone modified dicyclopentenyl di(meth) acrylate, ethylene oxide modified di(meth) acrylate, di(methyl) propylene oxiranyl ethyl isocyanurate Acid ester, allylated cyclohexyl di(meth) acrylate, tricyclodecane dimethanol (meth) acrylate, dimethylol dicyclopentane di(meth) acrylate, ethylene oxide Modified hexahydrophthalic acid di(meth)acrylate, tricyclodecane dimethanol (meth) acrylate, neopentyl glycol modified trimethylpropane di(meth) acrylate, King Kong Alkane di(meth)acrylate and 9,9-bis[4-(2-propenylmethoxyethoxy)phenyl]indole; trifunctional acrylate such as trimethylolpropane tri(methyl) Acrylate, dipentaerythritol tri(meth)acrylate, propionic acid Dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, and ethylene oxide modified trimethylolpropane triacrylate (eg, ethoxylated (6) trimethylolpropane III Acrylate and ethoxylated (9) trimethylolpropane triacrylate); tetrafunctional acrylates such as diglycerol tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional acrylate, For example, dipentaerythritol penta (meth) acrylate; and hexafunctional acrylates such as dipentaerythritol hexa(meth) acrylate, caprolactone-modified dipentaerythritol hexa(meth) acrylate and urethane ( Methyl) acrylate (for example, a reaction product of an isocyanate monomer and trimethylolpropane tri(meth) acrylate), but is not limited thereto. These crosslinking agents may be used singly or in combination.

Preferably, the (meth) acrylate monomer comprises 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 the oxyalkylene-modified trimethylolpropane triacrylate.

The (meth) acrylate monomer may contain a urethane group or may not contain a urethane group. The urethane group-containing (meth) acrylate monomer can be obtained from a commercially available product or can be produced 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 not limited to this.

The crosslinking agent may further include a monomer having an epoxy group or an oxetane group in addition to the (meth) acrylate monomer. The monomer having an epoxy group or an oxetane 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 layer. The monomer having an epoxy group or an oxetane group may include a group 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 the group consisting of monomers, and mixtures thereof.

The linear aliphatic epoxy monomer may include 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, trimethylolpropane tricondensate Glycidyl ether, polyethylene glycol diglycidyl ether, glycerol triglycidyl ether, and polypropylene glycol diglycidyl ether; polycondensation of polyether polyol obtained by adding one or more alkylene oxides to an aliphatic polyol Glycidyl ethers, such as ethylene glycol, propylene glycol, glycerol, etc.; diglycidyl esters of aliphatic long-chain dibasic acids; diglycidyl esters of aliphatic long-chain dibasic acids; monoglycidyl ethers of higher aliphatic alcohols; shrinkage of higher fatty acids Glycerol ether; epoxidized soybean oil; butyl epoxide stearate; octyl epoxy stearate; epoxidized linseed oil; epoxidized polybutadiene.

The cyclic aliphatic epoxy monomer is a compound having at least one epoxy group in the alicyclic group. Specifically, the cyclic aliphatic epoxy monomer may include an alicyclic epoxy carboxylic acid ester, an alicyclic epoxy (meth) acrylate, or 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'-methylcyclohexane 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-epoxycyclohexanecarboxylate), ethylene glycol bis(3,4-epoxy ring) Hexylmethyl)ether, ethylenebis(3,4-epoxycyclohexanecarboxylate), 3,4-epoxycyclohexylmethyl(meth)acrylate, bis(3,4-epoxycyclohexyl) Methyl) adipate, 4-vinylcyclohexene dioxide, vinylcyclohexene monooxide, and the like.

The hydrogenated aromatic hydrocarbon epoxy monomer means a compound obtained by selective hydrogenation of an aromatic epoxy monomer under pressure in the presence of a catalyst. The aromatic epoxy monomer may include, for example, a bisphenol type epoxy resin such as diglycidyl ether of bisphenol A, diglycidyl ether of bisphenol F, and diglycidyl ether of bisphenol S; novolak type epoxy resin For example, phenol novolac epoxy resin, cresol novolac epoxy resin and hydroxybenzaldehyde phenol novolac epoxy resin; and polyfunctional epoxy resin, such as glycidyl ether of tetrahydroxyphenylmethane, glycidol of tetrahydroxybenzophenone Ether and epoxidized polyethylene phenol.

The oxetane monomer may include at least one selected from the group consisting of 3-methyloxetane, 2-methyloxetane, 2-ethylhexyloxybutane, and 3 - oxetane, 2-methylene oxetane, 3,3-oxetan dimethyl thiol, 4-(3-methyloxetan-3-yl)benzene Nitrile, N-(2,2-dimethylpropyl)-3-methyl-3-oxetanylmethylamine, N-(1,2-dimethylbutyl)-3-methyl- 3-oxetanylmethylamine, (3-ethyloxetan-3-yl)methyl(meth)acrylate, 4-[(3-ethyloxetan-3-yl) Methoxy]butan-1-ol, 3-ethyl-3-hydroxymethyloxetane, xylyl bis(oxetane) and 3-[ethyl-3[[(3- Ethyloxet-3-yl)]methoxy]methyl]oxetane, but is not limited thereto.

1 part by weight to 50 parts by weight, specifically 1 part by weight to 40 parts by weight, and 1 part by weight, based on 100 parts by weight of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and the crosslinking agent The crosslinking agent is added in an amount of 30 parts by weight or 1 part by weight to 20 parts by weight. Within this range, the composition ensures good properties of the window film in terms of scratch resistance, flexibility and hardness.

The initiator is used to cure the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and a crosslinking agent, and may include a photoradical initiator or a mixture thereof. The photoradical initiator can be selected from any photoradical initiator known to those skilled in the art. For example, the photoradical initiator may be selected from a hydroxyketone photoradical initiator, a phosphine oxide photoradical initiator, a benzoin photoradical initiator, and an aminoketone photoradical. Starting agent. In particular, the photoradical initiator may include 2,4,6-trimethylbenzimidyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzylidene)- Phenyl-phosphine oxide, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone compound (eg 2,2-dimethoxy-2-phenylbenzene) Ethyl ketone, 2,2'-diethoxyacetophenone, 2,2'-dibutoxyacetophenone, 2-hydroxy-2-methylpropiophenone, p-tert-butyltrichloroacetophenone , p-tert-butyldichloroacetophenone, 4-chloroacetophenone, 2,2'-dichloro-4-phenoxyacetophenone, dimethylaminoacetophenone, 2,2-di Methoxy-2-phenylacetophenone and 2,2-diethoxy-2-phenylacetophenone), 2-hydroxy-2-methyl-1-phenylpropan-1-one, 2 -Benzyl-2-dimethylamino-1-(4-morpholinylphenyl)-butan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-( Methylthio)phenyl]-2-morpholinyl-propan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)one, benzophenone, pair Phenylbenzophenone, 4,4-diethylaminobenzophenone, dichlorobenzophenone, 2-methylindole, 2-ethylhydrazine, 2-third Bismuth, 2-aminopurine, 2-methylthioxanthone), 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-di Ethyl thioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylamino benzoate, oligo[2-hydroxy-2-methyl-1-[ 4-(1-methylvinyl)phenyl]acetone] and the like. Preferably, a hydroxyketone-based initiator such as 1-hydroxycyclohexyl phenyl ketone is used.

The starter may further comprise a typical photocationic starter known to those skilled in the art. For example, the photocationic initiator may further comprise a phosphonium salt compound.

It may be present in an amount of from 0.1 part by weight to 10 parts by weight, specifically from 0.5 part by weight to 5 parts by weight, based on 100 parts by weight of the fluorenone resin of the formula 1, the fluorenone resin of the formula 2, and the crosslinking agent, more specifically The amount of the initiator is from 1 part by weight to 3 parts by weight. Within this range, the fluorenone resin can be sufficiently cured by the initiator, and the deterioration of the optical properties (transmittance, color, photostability, etc.) of the window film due to the remaining initiator can be prevented.

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

The nanoparticles can be independently included in the composition for the window film without being coupled to the fluorenone resin of Formula 1 or the fluorenone resin of Formula 1. Nanoparticles can further increase the hardness of the window film. The nanoparticle may include at least one of cerium oxide, aluminum oxide, zirconium oxide, and titanium oxide, but is not limited thereto.

Nanoparticles can include particles that are not subjected to surface treatment. Alternatively, the nanoparticles may be partially or completely surface treated with an anthrone compound to be mixed with the anthrone resin. Alternatively, the nanoparticle may include a (meth) acrylate-based surface-treated nanoparticle to increase the hardness of the window film by crosslinking with the fluorenone resin of Formula 1.

Nanoparticles are not limited to a specific shape or size. Specifically, the nanoparticles may include spherical particles, flake particles, or amorphous particles. The nanoparticle may have 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. Average particle size (D50). Within this range, the nanoparticles can increase the hardness of the window film without affecting the surface roughness and transparency of the window film.

0.1 parts by weight to 60 parts by weight, specifically 1 part by weight to 30 parts by weight, based on 100 parts by weight of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, a crosslinking agent, and nanoparticles Amount of nanoparticle. Within this range, the nanoparticles can increase the hardness of the window film without affecting its surface roughness and transparency. Here, the above-described amount of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and a crosslinking agent may be present.

The composition for a window film according to the present embodiment may further contain an additive. Additives provide additional functionality to the window film. The additive can be any of the additives commonly used in prior art window films. Specifically, the additive may include at least one of the following: an ultraviolet absorber, a reaction inhibitor, an adhesion promoter, a thixotropic agent, a conductivity imparting agent, a color modifier, a stabilizer, and an antistatic agent. , but not limited to, antioxidants, leveling agents, anti-fingerprint agents and surface energy regulators. The adhesion promoter may include a decane compound containing an epoxy group or an alkoxyalkyl group. The thixotropic agent can include smoked cerium oxide. The conductivity imparting agent may include a metal powder such as silver powder, copper powder, aluminum powder, or the like. Color modifiers can include pigments, dyes, and the like. UV absorbers improve the light stability of window films. The ultraviolet absorber can be any of the typical absorbents 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 is not limited thereto. The leveling agent may include an anthrone-based leveling agent such as an anthrone-based leveling agent containing a (meth) acrylate group (for example, BYK-3500), but is not limited thereto.

The additive may be present in an amount of from 0.01 part by weight to 5 parts by weight, specifically from 0.05 part by weight to 2.5 parts by weight, based on 100 parts by weight of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and a crosslinking agent. Within this range, the additive 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 contain a solvent to improve coatability, wettability, or workability. 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.

Aside according to the present embodiment, the composition for the window film further contains nano particles and at least a part of the fluorenone resin of Formula 1 or the fluorenone resin of Formula 2 is coupled to the nanoparticles to form a composite, according to the present embodiment. The composition is substantially the same as the composition for the window film according to the above embodiment.

At least a portion of the fluorenone resin of Formula 1 or the fluorenone resin of Formula 2 is coupled to the nanoparticles. Therefore, the composition for the window film according to the present embodiment can further increase the window as compared with the other composition including the same amount of the fluorenone resin of Formula 1, the fluorenone resin of Formula 2, and the nanoparticles. The hardness of the film. Preferably, the composition for the window film comprises a mixture of an anthrone resin and a composite comprising an anthrone resin coupled to the nanoparticles. With such a structure, the composition can improve both the hardness and flexibility of the window film.

A combination of at least one of the fluorenone resin of Formula 1 and the fluorenone resin of Formula 2 and at least one of the fluorenone resin of Formula 1 and the fluorenone resin of Formula 2 coupled to the nanoparticles In the mixture of the substance (B), the composite (B) may be present in an amount of from 10% by weight to 60% by weight, specifically from 20% by weight 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.

The nanoparticles may include the above nanoparticles.

1 is a conceptual diagram of a composite of cerium oxide nanoparticles and an example of an fluorenone resin represented by Formula 1. Referring to Fig. 1, the OH group on the surface of the cerium oxide nanoparticles is coupled to the cerium of the fluorenone resin of Formula 1, whereby the cerium oxide particles can be surface-treated with the fluorenone resin of Formula 1. Therefore, the nanoparticle can be efficiently mixed with the anthrone resin of Formula 1, thereby improving the optical transparency of the window film while facilitating the manufacture 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 contain an anthrone resin which does not contain a radical reactive functional group. For example, the composition for a window film according to the present embodiment may include a third fluorenone 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 (wherein R ²¹ is an epoxy group or an epoxy group-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 substituted or unsubstituted C ₁ to C ₁₀ alkyl, substituted or unsubstituted C ₃ to C ₁₀ cycloalkyl, substituted or not Substituted C ₆ to C ₁₀ aryl, epoxy or epoxy group-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 epoxy group cycloalkyl group, for example, a 3,4-epoxycyclohexyl group or a glycidoxy group. The epoxy group-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-glycidoxypropyl.

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

Referring to FIG. 2, a flexible window film 100 in accordance with one embodiment of the present invention can include a substrate layer 110 and a coating 120, wherein the coating 120 can be formed from a composition for a window film in accordance with an embodiment of the present invention.

The base layer 110 can increase the mechanical strength of the flexible window film 100 by supporting the coating 120 of the flexible window film 100. The base layer 110 may be attached to the display portion, the touch screen panel, or the polarizing plate via an adhesive layer or the like. The base layer 110 may be formed of an optically transparent flexible resin. For example, the resin may include at least one selected from the group consisting of polyester resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate. Ester and polybutylene naphthalate; polycarbonate resin; polyimine resin; polystyrene resin; poly(meth) acrylate resin containing poly(methyl methacrylate); cycloolefin polymer Resin; and polyamide resin. These resins may be used singly or in the form of a mixture thereof. The substrate layer 110 can have a thickness of from 10 micrometers to 200 micrometers, specifically from 20 micrometers to 150 micrometers, and more specifically from 50 micrometers to 100 micrometers. Within this range, the substrate 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, the display portion, the touch screen panel, or the polarizing plate and provide a desirable appearance, and has high flexibility and high hardness for use in Flexible display. The coating 120 can have a thickness of from 5 microns to 100 microns, specifically from 10 microns to 80 microns, and more specifically from 10 microns to 50 microns. Within this range, the coating can be used in flexible window films.

Although not shown in FIG. 2, a functional surface layer such as an anti-reflective layer, an anti-glare layer, a hard coat layer, and an anti-fingerprint layer may be formed on the other surface of the coating layer 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 can have a transmittance of 88% or greater, in particular 88% to 100%, in the visible range, in particular in the wavelength region of 400 nm to 800 nm. Within this range, the flexible window film can be used as a flexible 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. As used herein, the phrase "radius of curvature in the direction of stretching" means the radius of curvature measured when the window film is folded toward the substrate layer after the base layer of the window film is brought into contact with the jig for measuring the radius of curvature. Here, the term "radius of curvature in the direction of compression" means the radius of curvature measured when the window film is folded toward the coating after the coating of the window film is brought into contact with the jig for measuring the radius of curvature. In particular, the flexible window film 100 may have a pencil hardness of 3H or more, such as 3H to 9H, and 0 mm to 5 mm in the stretching direction, for example 0 mm to 1.0 mm, more specifically It has a radius of curvature of 0 mm and has a radius of curvature of 0 mm to 5.0 mm, for example 0 mm to 1.0 mm or 0 mm in the compression direction.

The flexible window film 100 can have a tip that, when containing steel wool (eg, Liberon steel wool #0000), moves 40 mm over the window coating at a speed of 60 mm/sec under a load of 1.5 kg. The distance measured is a scratch or less than a scratch. Within this range, the flexible window film has good scratch resistance to provide a good appearance. The flexible window film 100 can have an impact resistance of 4.5 centimeters or greater than 4.5 centimeters as measured by pen drop testing as described below. Within this range, the flexible window film has good impact resistance to prevent damage to the organic light emitting diode panel when mounted on an organic light-emitting diode (OLED) 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 can have a reflected image quality (RIQ) value of 90 or greater than 90, specifically 90 to 98. Within this range, the window film has good surface quality and provides a clear image on the display.

The flexible window film 100 can have a thickness of 5 microns 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 is a cross-sectional view of a flexible window film in accordance with 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 the other surface of the base layer 110, the flexible window film 200 is substantially the same as according to the above embodiment. Window film 100. The adhesive layer 130 formed on the other surface of the base layer 110 can facilitate adhesion between the flexible window film and the touch screen panel, the polarizing plate, or the display portion. The flexible window film 200 according to the present embodiment is substantially the same as the window film 100 according to the above embodiment except for the adhesive layer. Therefore, the following description will focus on the adhesive layer 130.

The adhesive layer 130 is used to bond 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 can be formed of an adhesive composition.

In one embodiment, the adhesive layer 130 may be formed of an adhesive composition comprising an adhesive resin (eg, (meth)acrylic resin, urethane resin, fluorenone resin, and epoxy) Resin), curing agent, photoinitiator and decane coupling agent.

The (meth)acrylic resin may include a typical (meth)acrylic copolymer containing an alkyl group, a hydroxyl group, an aromatic group, a carboxylic acid group, an alicyclic group, a heteroalicyclic group Base. 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, having at least one hydroxyl group a C ₁ to C ₁₀ alkyl (meth)acrylic monomer, a C ₆ to C ₂₀ aromatic (meth)acrylic monomer, a carboxylic acid group containing (meth)acrylic monomer, C ₃ a (meth)acrylic monomer to a C ₂₀ alicyclic group and a C ₃ to C ₁₀ heteroalicyclic group having at least one of nitrogen (S), oxygen (O) and sulfur (S) Methyl) acrylic monomer.

The curing agent may be a polyfunctional (meth) acrylate, and may include a difunctional (meth) acrylate such as hexanediol diacrylate; a trifunctional (meth) acrylate such as trimethylolpropane tri ( Methyl) acrylate; tetrafunctional (meth) acrylate such as pentaerythritol tetra(meth) acrylate; pentafunctional (meth) acrylate such as dipentaerythritol penta (meth) acrylate; and hexafunctional (methyl) An acrylate such as dipentaerythritol hexa(meth) acrylate, but is not limited thereto.

The photoinitiator is a typical photoinitiator and may include the above photoradical initiators.

The decane coupling agent may include a decane coupling agent containing an acryl group, such as 3-propenyloxypropyltrimethoxydecane.

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

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

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

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

Referring to FIG. 4, the flexible window film is substantially identical to the flexible window film 100 except that the flexible window film 150 according to the present embodiment includes the 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 interposed between the first film 110a and the second film 110b. Due to the base layer 110A, the flexible window film has improved flexibility and further improved impact resistance as compared to a window film comprising the base layer 100.

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

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

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

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

The adhesive layer 110c is interposed between the first film 110a and the second film 110b to bond the first film 110a to the second film 110b. The adhesive layer 110c can improve the flexural 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 modulus of 10 kPa to 1,000 kPa at 25 °C. Within this range, the adhesive layer can improve the impact resistance of the window film and ensure high reliability when the window film is folded once or repeatedly folded 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 ensure high reliability when the window film is folded once or repeatedly folded 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 ensure high reliability when the window film is folded once or repeatedly folded at a low temperature. 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, more specifically 1 :1 to 1:2.8. Within this range, the adhesive layer encounters less variation in properties due to temperature variations over a wide temperature range (-20 ° C to 25 ° C) while preventing delamination or bubbling in the foldable test. And thus can be used in a flexible optical member.

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

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

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

The adhesive layer 110c may have a glass transition of 0 ° C or lower, such as -150 ° C to 0 ° C, specifically -150 ° C to -20 ° C, more specifically -150 ° C to -30 ° C. Temperature (Tg). Within this range, the adhesive layer exhibits good viscoelasticity at low temperatures 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 group-containing (meth)acrylic copolymer; an initiator; and at least 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 group-containing (meth)acrylic copolymer; an initiator; and organic nanoparticles.

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

The hydroxyl group-containing (meth) acrylate imparts adhesive strength to the adhesive layer. The hydroxyl group-containing (meth) acrylate may be a (meth) acrylate containing at least one hydroxyl group. For example, the hydroxyl group-containing (meth) acrylate may include at least one of the following: 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxy propyl acrylate Base (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 (methyl) Acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, neopentyl glycol mono(meth)acrylate, trimethylolpropane di(meth)acrylate, trishydroxyl Ethyl ethane di(meth) acrylate, 2-hydroxy-3-phenyl oxypropyl (meth) acrylate, 4-hydroxycyclopentyl (meth) acrylate, 4-hydroxycyclohexyl (methyl) Acrylate and cyclohexanedimethanol mono(meth)acrylate. The total amount of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate may be from 5% by weight to 40% by weight, for example from 8% by weight to 30% by weight, specifically The hydroxyl group-containing (meth) acrylate is used in an amount of 10% by weight to 30% by weight. Within this range, the adhesive composition can further improve the adhesion strength and durability of the adhesive layer.

The alkyl group-containing (meth) acrylate may constitute a copolymer to form a matrix of the adhesive layer. Alkyl group-containing (meth) acrylates may include a non-substituted C ₁ to C ₂₀ linear or branched alkyl (meth) acrylate. For example, the alkyl group-containing (meth) acrylate may include at least one of: methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, (methyl) ) n-butyl acrylate, tert-butyl (meth)acrylate, isobutyl (meth)acrylate, amyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate , ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, decyl (meth) acrylate, (a) Base) Lauryl acrylate and isobornyl (meth)acrylate. The total amount of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate may be from 60% by weight to 95% by weight, for example from 65% by weight to 92% by weight, specifically The alkyl group-containing (meth) acrylate is in an amount of from 68% by weight to 90% by weight, more specifically from 70% by weight to 90% by weight. Within this range, the adhesive composition can further improve the adhesion strength and durability of the adhesive layer.

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

The ethylene oxide-containing monomer may include at least one (meth) acrylate monomer containing an oxiranyl 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, polyepoxy Ethane monoethyl ether (meth) acrylate, polyethylene oxide monopropyl ether (meth) acrylate, polyethylene oxide monobutyl ether (meth) acrylate, polyethylene oxide monopentyl ether ( Methyl) acrylate, polyethylene oxide dimethyl ether (meth) acrylate, polyethylene oxide diethyl ether (meth) acrylate, polyethylene oxide monoisopropyl ether (meth) acrylate , but not limited to, polyethylene oxide monoisobutyl ether (meth) acrylate and polyethylene oxide monobutyl ether (meth) acrylate.

The propylene oxide-containing monomer may include a polypropylene oxide alkyl ether (meth) acrylate monomer such as polypropylene oxide monomethyl ether (meth) acrylate or 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 Methyl ether (meth) acrylate, polypropylene oxide diethyl ether (meth) acrylate, polypropylene oxide monoisopropyl ether (meth) acrylate, polypropylene oxide monoisobutyl ether (meth) acrylate Ester and polypropylene oxide mono-tert-butyl ether (meth) acrylate, but not limited to this.

The amine group-containing monomer may include an amine group-containing (meth) acrylate monomer such as monomethylaminoethyl (meth) acrylate, monoethyl amino ethyl (meth) acrylate, Monomethylaminopropyl (meth) acrylate, monoethylaminopropyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, diethylaminoethyl ( Methyl) acrylate, N-t-butylaminoethyl (meth) acrylate, and (meth) propylene methoxyethyl trimethyl ammonium chloride, but not limited thereto.

The alkoxy-containing monomer may include an alkoxy-containing (meth)acrylic monomer such as 2-methoxyethyl (meth) acrylate or 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, but not limited to this.

The phosphate group-containing monomer may include a phosphoric acid group-containing acrylic monomer such as 2-methylpropenyloxyethyl diphenyl phosphate (meth) acrylate or trimethyl propylene decyloxyethyl group. Phosphate (meth) acrylate and tripropylene decyl oxyethyl phosphate (meth) acrylate, but are not limited thereto.

The sulfonic acid group-containing monomer may include a sulfonic acid group-containing acrylic monomer such as sodium sulfopropyl (meth)acrylate, sodium 2-sulfoethyl (meth)acrylate, and 2-acrylamidoamino-2- Sodium methyl propane sulfonate, but not limited to this.

The phenyl group-containing monomer may include a phenyl group-containing (meth)acrylic monomer such as p-tert-butylphenyl (meth) acrylate, o-biphenyl (meth) acrylate, and phenoxy B. Base (meth) acrylate, but not limited to this.

The decyl group-containing monomer may include a decyl group-containing vinyl monomer such as 2-ethyl decyl ethoxyethyl (meth) acrylate, vinyl trimethoxy decane, vinyl triethoxy decane. , but not limited to, vinyl tris(2-methoxyethyl)decane, vinyltriethoxydecane, and methacryloxypropyltrimethoxydecane.

The carboxylic acid group-containing monomer may include (meth)acrylic acid, 2-carboxyethyl (meth) acrylate, 3-carboxypropyl (meth) acrylate, 4-carboxybutyl (meth) acrylate , butaconic acid, crotonic acid, maleic acid, fumaric acid, and maleic anhydride, but not limited thereto.

The mercapto group-containing (meth) acrylate may include a mercapto group-containing (meth)acrylic monomer such as (meth) acrylamide, N-methyl (meth) acrylamide, N-hydroxyl Methyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, N-methylene bis (meth) acrylamide, N-hydroxyethyl (methyl) Acrylamide and N,N diethyl(meth)acrylamide are not limited thereto.

It may be 15 parts by weight or less, particularly 10 parts by weight or less, based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate. More specifically, the copolymerizable monomer is in an amount of from 0.05 part by weight to 8 parts by weight. Within this range, the adhesive composition can further improve the adhesion 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 photoinitiator, a hydroxyketone photoinitiator, an aminoketone photoinitiator, a phosphine oxide photoinitiator, 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 compound (for example, acetophenone, dimethylamino group) Acetophenone, 2,2-dimethoxy-2-phenylacetophenone and 2,2-diethoxy-2-phenylacetophenone), 2-hydroxy-2-methyl-1- Phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinyl-propan-1-one, 4- (2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)one, benzophenone, p-phenylbenzophenone, 4,4-diethylaminobenzophenone, dichlorobenzene Methyl ketone, 2-methyl hydrazine, 2-ethyl hydrazine, 2-tert-butyl fluorene, 2-amino hydrazine, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2 - chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetophenone dimethyl ketal, p-dimethyl Aminobenzoate, oligo[2-hydroxy-2-methyl-1-[4-(1-methylvinyl)phenyl]propanone] and 2,4,6-trimethylbenzhydrazide Base-diphenyl-phosphine oxide, but not limited thereto. 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 of the typical initiators such as azo compounds, peroxide compounds, and redox compounds. Examples of the azo compound may include 2,2-azobis(2-methylbutyronitrile), 2,2-tril azobis(isobutyronitrile), 2,2-tril azobis(2,4- Dimethylvaleronitrile), 2,2-nit azobis-2-hydroxymethylpropionitrile, dimethyl-2,2-methylazobis(2-methylpropionate) and 2,2 -pioazobis(4-methoxy-2,4-dimethylvaleronitrile), but is not limited thereto. Examples of the peroxide compound may include: inorganic peroxides such as potassium perchlorate, ammonium persulfate, and hydrogen peroxide; and organic peroxides such as diethyl hydrazine peroxide, peroxydicarbonate, and peroxyester , tetramethylbutyl peroxy neodecanoate, bis(4-butylcyclohexyl)peroxydicarbonate, di(2-ethylhexyl)peroxycarbonate, butyl peroxy neodecanoate, Dipropyl peroxydicarbonate, diisopropyl peroxydicarbonate, diethoxyethyl peroxydicarbonate, diethoxyhexyl peroxydicarbonate, hexyl peroxydicarbonate, Methoxybutyl peroxydicarbonate, bis(3-methoxy-3-methoxybutyl)peroxydicarbonate, dibutylperoxydicarbonate, di-hexadecyl peroxylate Dicarbonate, di-tetradecyl peroxydicarbonate, 1,1,3,3-tetramethylbutyl peroxypivalate, hexyl peroxypivalate, butyl peroxypivalate Ester, trimethylhexyl peroxide, dimethyl hydroxybutyl peroxy neodecanoate, pentyl peroxy neodecanoate, butyl peroxy neodecanoate , tert-butyl peroxy neoheptanoate, pentyl peroxypivalate, tert-butyl peroxypivalate, third amyl peroxy-2-ethylhexanoate, bay laurel Base peroxide, dilauroyl peroxide, dimercapto peroxide, benzhydryl peroxide, and benzhydryl 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.

It may be present in an amount of from 0.0001 part by weight to 5 parts by weight, based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate constituting the (meth)acrylic copolymer and the alkyl group-containing (meth) acrylate, specifically The amount of the initiator is from 0.001 part by weight to 3 parts by weight. Within this range, the initiator can completely cure the adhesive composition, prevent deterioration of the transmittance of the adhesive film due to residual initiator, suppress bubble generation, and ensure good reactivity.

The macromonomer has a functional group which is curable by actinic radiation and which is polymerizable with a hydroxyl group-containing (meth) acrylate and an alkyl group-containing (meth) acrylate. Specifically, the giant monomer can be represented by Formula 4: <Formula 4> Wherein R ₁ hydrogen or methyl, X is a single bond or a divalent coupling group, and Y is selected from methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate A polymer chain obtained by polymerization of at least one of (meth)acrylic acid isobutyl ester, (meth)acrylic acid tert-butyl ester, styrene, and (meth)acrylonitrile.

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

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

In addition, the divalent coupling group can be represented by Formula 4a to Formula 4d: <Formula 4a> <Formula 4b> <式4c> <Form 4d> Where * is the connection site of the element.

Giant monomers are available from commercial products. For example, the macromonomer may include a macromonomer in which a segment corresponding to Y is methyl methacrylate, a macromonomer in which a segment corresponding to Y is styrene, wherein a segment corresponding to Y is The macromonomer of styrene/acrylonitrile, and the macromonomer in which the segment corresponding to Y is butyl acrylate, all of which have a terminal methacrylinyl group.

20 parts by weight or less than 20 parts by weight, specifically 0.1 parts by weight to 20 parts by weight, based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate, A macromonomer in an amount of from 0.1 part by weight to 10 parts by weight or from 0.5 part by weight to 5 parts by weight. Within this range, the adhesive layer achieves a balance of properties between viscoelasticity, modulus, and restoring force, and prevents haze from increasing.

The organic nanoparticle may have from 10 nm to 400 nm, in particular from 10 nm to 300 nm, more specifically from 30 nm to 280 nm, and more specifically from 50 nm to 280 The average particle size of the nano. Within this range of the average particle diameter, the organic nanoparticle does not affect the foldability of the adhesive layer, and the adhesive layer can be ensured by ensuring a total transmittance of about 90% or more in the visible range. Has good transparency.

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

The organic nanoparticle may have a core-shell structure or a simple structure (for example, 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 nanoparticle may include nanoparticle in which the core and the shell are formed of an organic material. Since the organic nanoparticle has 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) wherein Tg(c) is the glass transition temperature of the core (unit: ° C), 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. The core is a spherical particle. In some embodiments, the core may include additional layers surrounding the spherical particles as long as the core has a glass transition temperature that satisfies the above equation.

In particular, the core may have a glass transition temperature of from -150 ° C to 10 ° C, specifically from -150 ° C to -5 ° C, more specifically from -150 ° C to -20 ° C. Within this range, the adhesive layer can have good viscoelastic properties at low temperatures and/or room temperatures. The core may include at least one of poly(alkyl (meth) acrylate), polyoxy siloxane, and polybutadiene having glass transition temperatures within this range.

Poly(alkyl (meth) acrylate) includes poly(methyl acrylate), poly(ethyl acrylate), poly (propyl acrylate), poly (butyl acrylate), poly (isopropyl acrylate), poly ( At least one of hexyl acrylate, poly(hexyl methacrylate), poly(ethylhexyl acrylate), and poly(ethylhexyl methacrylate), but is not limited thereto.

The polyoxyalkylene can be, for example, an organooxane (co)polymer. The organooxane (co)polymer can be a non-crosslinked or crosslinked organooxane (co)polymer. Crosslinked organooxane (co)polymers can be used to ensure impact resistance and colorability. In particular, the crosslinked organooxane (co)polymer may comprise crosslinked dimethyl methoxy olefin, methyl phenyl siloxane, diphenyl siloxane, and mixtures thereof. The nanoparticle may have a refractive index of 1.41 to 1.50 due to the presence of two more copolymers of an organic siloxane.

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 organooxane (co)polymer is increased, the degree of dissolution of the organooxane (co)polymer is lowered. The solvent used to determine the crosslinking state may include acetone, toluene, or the like. In particular, the organomethoxyalkane (co)polymer may have a moiety that is insoluble in acetone or toluene. The organooxane copolymer may include about 30% or more of insolubles in toluene.

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

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

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

The amount may be from 0.1 part by weight to 20 parts by weight, specifically from 0.5 part by weight to 10 parts by weight, based on 100 parts by weight of the hydroxyl group-containing (meth) acrylate and the alkyl group-containing (meth) acrylate. The organic nanoparticle is in an amount of from 0.5 part by weight to 8 parts by weight. Within this range, the organic nanoparticle ensures the modulus at the high temperature of the adhesive layer, 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. Aspects have good properties.

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

The adhesive composition may further comprise a decane coupling agent. The decane coupling agent can be a typical decane coupling agent known to those skilled in the art. For example, the decane coupling agent may include at least one selected from the group consisting of epoxidized hydrazine compounds, such as 3-glycidoxypropyltrimethoxy decane, 3-glycidoxy propyl acrylate Triethoxy decane, 3-glycidoxypropylmethyldimethoxydecane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxynonane; containing polymerizable unsaturated groups Ruthenium compounds, such as vinyl trimethoxy decane, vinyl triethoxy decane, and (meth) propylene methoxy propyl trimethoxy decane; amine group containing hydrazine compounds, such as 3-aminopropyl trimethoxy Basear, N-(2-aminoethyl)-3-aminopropyltrimethoxydecane and N-(2-aminoethyl)-3-aminopropylmethyldimethoxydecane; And 3-chloropropyltrimethoxydecane, but not limited to this. The amount may be from 0.01 part by weight to 3 parts by weight, specifically from 0.01 part by weight 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. Decane coupling agent. Within this range, the decane coupling agent ensures the reliability of the adhesive layer in a bent state under the high temperature/humidity conditions as described above, and can provide a small peel strength difference between low temperature, room temperature and high temperature.

The adhesive composition may further comprise a crosslinking agent. The crosslinking agent can increase the mechanical strength of the adhesive layer by increasing the degree of crosslinking of the adhesive composition. The crosslinking agent can include a polyfunctional (meth) acrylate that can be cured by actinic radiation. For example, the crosslinking agent can include a difunctional (meth) acrylate (eg, hexanediol diacrylate) or a trifunctional to hexafunctional (meth) acrylate. The amount may be from 0.001 part by weight to 5 parts by weight, specifically from 0.003 part by weight to 3 parts by weight, 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 from 0.005 parts by weight to 1 part by weight. Within this range, the adhesive layer exhibits good adhesion and improved reliability.

4 shows a stacked structure of a base film in which the first film 110a is stacked on the second film 110b via the 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 window film according to still another embodiment of the present invention will be explained with reference to FIG. Figure 5 is a cross-sectional view of a flexible window film in accordance with yet another embodiment of the present invention.

Referring to FIG. 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, which includes a flexible window film 390 according to an embodiment of the present invention. Flexible window film.

The display portion 350a is for driving 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 the touch screen panel. The flexible printed circuit board may further include a timing controller, a power source, or the like to drive the array formed of the organic light emitting diodes.

The lower substrate may include a substrate formed of a flexible resin. Specifically, the lower substrate may include a flexible substrate such as an anthrone substrate, a polyimide substrate, a polycarbonate substrate, or a polyacrylate substrate, but is not limited thereto.

In a display area of the lower substrate, a plurality of driving wires (not shown) intersecting each other and a plurality of sensor wires (not shown) define a plurality of pixel domains, and the pixel domains are Each of the organic light emitting diodes may be formed with an array of organic light emitting diodes, 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 a signal to the driving wires may be formed in the form of a gate-in panel. An 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. The thin film transistor may include a gate electrode, 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, or an organic thin film transistor using an organic material as a semiconductor layer, and a non-use film. An amorphous germanium thin film transistor in which a wafer is used as a semiconductor layer or a polycrystalline germanium transistor in which polycrystalline germanium is used as a semiconductor layer.

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

The organic light emitting diode is displayed 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 may 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 a (meth) acrylate, an epoxy polymer, or a quinone polymer. Specifically, the protective layer may include an encapsulation layer in which the inorganic material layer and the organic material layer are sequentially stacked one or more times.

Referring again to FIG. 5, the adhesive layer 360 bonds the display portion 350a to the polarizing plate 370, and may be formed of an adhesive composition containing a (meth) acrylate resin, a curing agent, a starter, and a decane coupling agent.

The polarizing plate 370 can achieve polarization of the internal light or prevent external light from being reflected to achieve display, or can increase the contrast of the display. The polarizing plate may be composed only of 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 polarizers, protective films and protective coatings, typical polarizers, typical protective films and typical protective coatings known in the art can be used.

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

A flexible window film 390 can be provided as the 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 enhance the polarizing plate. Coupling between the touch screen panel and the flexible window film. The adhesive layer may be formed of an adhesive composition comprising a (meth) acrylate resin, a curing agent, a starter, and a decane coupling agent. Alternatively, the adhesive layer can comprise organic nanoparticle. Although not shown in FIG. 5, a polarizing plate may be further disposed under the display portion 350a 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 is a cross-sectional view of a flexible display in accordance with another embodiment of the present invention.

Referring to FIG. 6, the flexible display 400 according to the present embodiment includes a display portion 350a, a touch screen panel 380, a polarizing plate 370, and a flexible window film 390, which includes a flexible window film 390 according to an embodiment of the present invention. Flexible window film. The flexible display according to the present 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 can 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 formed on the display portion 350a, the flexible display according to the present 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 can be formed by deposition, but is not limited thereto. Although not shown in FIG. 6, it may be between the display portion 350a 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 to enhance the mechanical strength of the display. The adhesive layer may be formed of an adhesive composition comprising a (meth) acrylate resin, a curing agent, a starter, and a decane coupling agent. Although not shown in FIG. 6, a polarizing plate may be further disposed under the display portion 350a to provide a good displayed image by polarization of internal light.

Next, a flexible display according to still another embodiment of the present invention will be explained with reference to FIG. 7 is a cross-sectional view of a flexible display in accordance with yet another embodiment of the present invention. Referring to FIG. 7, a flexible display 500 according to the present embodiment includes a display portion 350b, an adhesive layer 360, and a flexible window film 390 including a flexible window film according to an embodiment of the present invention. The flexible display according to the present 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 of preparing the fluorenone resin of Formula 1 according to an embodiment of the present invention will be explained.

The fluorenone resin of Formula 1 can be prepared by including an anthracene monomer (R ¹ SiO _3/2 ), an anthrone monomer (R ² SiO _3/2 ), an anthrone monomer (R ³ SiO). _3/2 ), at least one of an anthrone monomer (R ⁴ R ⁵ SiO _2/2 ), an anthrone monomer (R ⁶ R ⁷ R ⁸ SiO _1/2 ), and an anthrone monomer (SiO _4/2 ) One of the mixtures is subjected to hydrolysis and condensation.

The fluorenone 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, an anthrone can be prepared by condensing a fluorene monomer having an isocyanate group (NCO) and an alkoxyalkyl group with a (meth)acrylic monomer having a hydroxyl group and a (meth) acrylate group. Monomer (R ¹ SiO _3/2 ). The anthrone monomer having an isocyanate group and an alkoxyalkyl group may include 3-isocyanatepropyltriethoxydecane or the like. The (meth)acrylic monomer having a hydroxyl group and a (meth) acrylate group may include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl group (Meth) acrylate, etc. When the fluorenone monomer is condensed, a catalyst can be used to increase the reaction rate. For example, a tin catalyst (for example, dibutyltin dilaurate), an amine catalyst, or the like can be used.

The anthrone monomer (R ² 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, it can be prepared by condensing a fluorene monomer having an isocyanate group (NCO) and an alkoxyalkyl group with a (meth)acrylic monomer having a hydroxyl group and at least two (meth) acrylate groups. Anthrone monomer (R ² SiO _3/2 ). The fluorene monomer having an isocyanate group and an alkoxyalkyl group may include 3-isocyanate propyl triethoxy decane or 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 fluorenone monomer is condensed, a catalyst such as a tin catalyst, an amine catalyst or the like can be used.

The anthrone monomer (R ³ SiO _3/2 ) may include a fluorene monomer having a (meth) acrylate group, such as 3-(meth) propylene methoxy propyl trimethoxy decane, 3- (a) Base) acryl methoxy propyl triethoxy decane, methyl trimethoxy decane, and phenyl trimethoxy decane. The anthrone monomer (R ⁴ R ⁵ SiO _2/2 ) may include dimethyldimethoxydecane or the like. The anthrone monomer (R ⁶ R ⁷ R ⁸ SiO _1/2 ) may include hexamethyldioxane or the like. The anthrone monomer (SiO _4/2 ) may include tetramethoxydecane, tetraethoxydecane, tetrapropoxydecane, and the like.

Hydrolysis and condensation can be performed on the monomer mixture by a typical method for preparing an anthrone resin. Hydrolysis can include reacting the monomer mixture with at least one of water and an acid and a base. Specifically, the acid may include HCl, HNO ₃ , acetic acid, p-toluenesulfonic acid, or the like, and the base may include NaOH, KOH, or the like. The hydrolysis can be carried out at 20 ° C to 100 ° C for 10 minutes to 10 hours, and the condensation can be carried out 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 anthrone resin can be improved.

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

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

Anthrone monomer (A ³ _b SiO _(4-b)/2 ) may include 1H, 1H, 2H, 2H-perfluorotrimethoxydecane, 1H, 1H, 2H, 2H-perfluorooctyltrimethoxydecane ,1H,1H,2H,2H-perfluorohexyltrimethoxydecane, 1H,1H,2H,2H-perfluorotriethoxydecane, 1H,1H,2H,2H-perfluorooctyltriethoxydecane , 1H, 1H, 2H, 2H-perfluorohexyltriethoxydecane, and the like.

An anthrone monomer (SiO _3/2 -A ¹ -T ¹ -A ² -SiO _3/2 ) can be prepared by hydrogenation of hydrazine between divinyl ether and trialkoxy decane. 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 tetrakis (ethylene glycol) divinyl ether, and The trialkoxydecane may include at least one of triethoxydecane, trimethoxydecane, and tripropoxydecane. Hydrogenation of hydrazine can be carried out using a typical platinum catalyst to increase the reaction rate.

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

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

The method of applying the composition for the window film to the base layer 110 is not particularly limited. For example, the composition for the window film may be applied to the substrate layer by bar coating, spin coating, dip coating, roll coating, flow coating or die coating, but is not limited thereto. The composition for the window film can be applied to the thickness of 5 microns to 100 microns on the base layer 110. Within this thickness range, the desired coating can be ensured while providing good hardness, flexibility and reliability. Curing is performed to form a coating by curing a composition for a window film, and the curing may include photocuring. Photocuring can include irradiating the coated composition at a dose of 400 nanometers to less than 400 nanometers at a dose of 10 millijoules per square centimeter to 1,000 millijoules per square centimeter. Under these conditions, the composition for the window film can be sufficiently cured. As a result, the composition for a window film according to the present invention provides a window film having sufficient hardness by photocuring without additional heat treatment or aging after photocuring, thereby improving workability. The method may further comprise drying the composition prior to curing the composition for the window film applied to the substrate layer 110. When the curing is performed after drying, it is possible to prevent the surface roughness of the coating from being increased due to the photocuring for a long period of time. Drying can be carried out 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 is to be understood that the examples are provided for illustration only and are not intended to limit the invention in any way. Preparation Example 1 : First anthrone resin

Will contain 1.0 equivalent of 3-isocyanatepropyltriethoxydecane (KBE-9007, Shin-Etsu Co., Ltd.), 0.9 equivalent of 2-hydroxyethyl acrylate (锑希爱TCI Co., Ltd., and 0.1 equivalent of pentaerythritol triacrylate (Sigma-Aldrich Co., Ltd.) monomer mixture 100 g, 0.3 g of laurel Dibutyltin acid (Sigma-Aldrich Co., Ltd.) and 100 g of toluene were placed in a 500 ml 3-neck flask. The ingredients were stirred for 5 hours at room temperature and then 20 grams of a 0.1 N aqueous HCl solution was added to the mixture. The resulting mixture was stirred at 50 ° C for 8 hours. Next, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the aqueous layer was removed by stirring and sinking, and the process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Co., 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 fluorenone resin had 90% Solid content. Anthrone 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/mole as measured by gel permeation chromatography (GPC). Preparation Example 2 : First anthrone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatepropyltriethoxydecane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (锑希爱有限公司), 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Co., Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask. The ingredients were stirred for 5 hours at room temperature and then 20 grams of a 0.1 N aqueous HCl solution was added to the mixture. The resulting mixture was stirred at 50 ° C for 8 hours. Next, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the aqueous layer was removed by stirring and sinking, and the process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Co., 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 fluorenone resin had 90% Solid content. One silicone resin _{((X 1 -Ety-O- (} C = O) NH-Pry) SiO 3/2) having a weight of about 3,000 g / mole by gel permeation chromatography of (GPC) is measured in Average molecular weight. Preparation Example 3 : Second anthrone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatepropyltriethoxydecane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (锑希爱有限公司), 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Co., Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask. The components were stirred for 5 hours at room temperature, and then 0.05 equivalents of 1H, 1H, 2H, 2H-perfluorodecyltrimethoxydecane (Sigma-Aldrich Co., Ltd.) was added to the mixture. And 20 g of 0.1 N aqueous HCl solution. The resulting mixture was stirred at 50 ° C for 8 hours. Next, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the aqueous layer was removed by stirring and sinking, and the process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Co., 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 fluorenone resin had 90% Solid content. Anthrone 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) A weight average molecular weight of about 3,000 g/mole. Preparation Example 4 : Second fluorenone resin

100 g of a monomer mixture containing 1.0 equivalent of 3-isocyanatepropyltriethoxydecane (KBE-9007, Shin-Etsu Co., Ltd.) and 1.0 equivalent of 2-hydroxyethyl acrylate (锑希爱有限公司), 0.3 g of dibutyltin dilaurate (Sigma-Aldrich Co., Ltd.) and 100 g of toluene were placed in a 500 ml 3-necked flask, followed by stirring at room temperature for 5 hours, thereby preparing a reaction solution X.

In a 250 ml flask, 35 mM tris(ethylene glycol) divinyl ether (Aldrich), toluene and 150 ppm platinum catalyst (PT-CS-1.8CS, especially in a nitrogen atmosphere) Umicore was stirred. 70 mmol of triethoxydecane was added to the mixture, followed by stirring at 45 ° C for 2 hours. Next, the platinum catalyst is removed using activated carbon, whereby the reaction product Y is prepared.

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. Next, the mixture was cooled to room temperature and diluted with 400 g of toluene. After adding 200 grams of distilled water, the aqueous layer was removed by stirring and sinking, and the process was repeated four times. 0.04 g of 4-methoxyphenol (Sigma-Aldrich Co., 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 fluorenone resin had 90% Solid content. Anthrone 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/mol as measured by gel permeation chromatography (GPC).

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

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

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

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

(D) Nanoparticles: SST-550U (containing cerium oxide, solid content: 50% by weight, Ranco Co., Ltd.)

(E) Starting agent: Irgacure 184 (Ciba Co., Ltd.)

(F) Organic binder: ketone-free urethane acrylate resin (CHTU-9607, Chamton Co., Ltd.) Example 1

The first fluorenone resin, the second fluorenone resin, the crosslinking agent, and the starter were mixed to have a total weight of 5.0 g in parts by weight as listed in Table 1, and 5.0 g of the mixture was added to the mixture. Base ethyl ketone, thereby preparing a composition for a window film.

The prepared composition for the window film was applied to a polyimide film (PI film, thickness: 80 μm, Samsung SDI Co., Ltd.) at 80 ° C. It was dried for 4 minutes, and irradiated with ultraviolet light at 500 mJ/cm 2 under a nitrogen atmosphere, thereby forming a window film having a coating layer having a thickness of 10 μm. 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 fluorenone 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 fluorenone resin and the nanoparticles (in terms of solid content) were changed as listed in Table 1. Comparative Example 1 and Comparative Example 2

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

Table 1

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

(1) Scratch resistance (wear test): A tip (diameter: 11 mm) containing steel wool (Leebe steel wool #0000) was placed on the window coating of the window film, and the abrasion tester was at 1.5 kg. The load is moved at a speed of 60 mm/sec. This process was repeated 10 times and the number of scratches on the window coating was observed. The smaller the number of scratches, the better the scratch resistance is indicated. A window film having one scratch or less than one scratch is rated as a suitable window film.

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

(3) Reflected image quality: The quality of the reflected image was measured at 16 points on the window coating of the window film using Lopian IQ (Lopuan Co., Ltd.). An average is obtained by averaging the obtained values by excluding two minimum values and two maximum values, and the average value is 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: Pencil hardness was measured on a coating of a window film using a pencil hardness tester (Heidon) according to Japanese Industrial Standards (JIS) K5400. Using a 6B to 9H pencil (Mitsubishi Co., Ltd.) with a pencil load of 1 kg, a scratch angle of 45°, and a scratch rate of 60 mm/min on pencil hardness The measurement was carried out. When the coating had one or more scratches after 5 tests using a pencil, the pencil hardness was measured using another pencil whose pencil hardness was one grade lower than the previous pencil. The pencil hardness value for which no scratches were observed on all five times on the coating was regarded as the pencil hardness of the coating.

(5) Impact resistance (pen drop test): By adhering an adhesive film (thickness: 50 μm, OCA 8146, 3M Corporation) to each of the window films of the examples and the comparative examples, Make sure that the following window film is obtained, that is, the window coating is placed on the uppermost side of a polyethylene terephthalate (PET) film (thickness: 2,500 μm, Mitsubishi Co., Ltd.). Next, samples were prepared by sequentially stacking aluminum foil and stainless steel sheets (SUS sheets) on the lower surface of the polyethylene terephthalate film. Next, by making a pen having a weight of 5.8 g and a ball diameter of 0.7 mm fall at a predetermined height from the window coating of the sample, a mark visible to 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. The higher the initial height, the higher the impact resistance of the window film. In the pen fall test, an initial height of 4.5 cm or more than 4.5 cm means that the window film will not be damaged by the impact when the OLED panel is mounted on the window film.

Table 2

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 exhibits good flexibility when folded in the direction of the substrate layer. Sex. Further, the flexible window film of Example 6 including the film stack structure exhibited much better impact resistance than the flexible window film of Example 1.

On the contrary, the window films of Comparative Example 1 and Comparative Example 2, which did not include the first fluorenone resin of the present invention and the second fluorenone resin, exhibited poor properties in terms of scratch resistance, surface quality, and hardness. The window film of Reference Example 1 which does not contain the second fluorenone resin according to the present invention exhibits poor surface quality.

It will be appreciated that various modifications, changes, alterations and equivalents may be made by those skilled in the art without departing from the scope of the 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 Department

370‧‧‧Polarizer

380‧‧‧ touch screen panel

1 is a conceptual diagram of a composite of cerium oxide nanoparticles and an example of an fluorenone resin represented by Formula 1. 2 is a cross-sectional view of a flexible window film in accordance with one embodiment of the present invention. 3 is a cross-sectional view of a flexible window film in accordance with another embodiment of the present invention. 4 is a cross-sectional view of a flexible window film in accordance with yet another embodiment of the present invention. Figure 5 is a cross-sectional view of a flexible display in accordance with one embodiment of the present invention. 6 is a cross-sectional view of a flexible display in accordance with another embodiment of the present invention. 7 is a cross-sectional view of a flexible display in accordance with yet another embodiment of the present invention.

Claims (28)

A composition for a window film comprising: a first fluorenone resin represented by Formula 1; a second fluorenone 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 at least two (methyl group) a monovalent organic group of an acrylate group and at least one urethane group; R ³ is a non-carbamate-based monovalent organic group containing at least one (meth) acrylate group, 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 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 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). <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 contains one (meth)acrylic acid a monovalent organic group of an ester group and at least one urethane group or a non-urethane type monovalent organic group containing a (meth) acrylate group; R ¹² is an 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 Each independently being 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 naphthenic ring a C ₆ to C ₃₀ aryl group which is unsubstituted or substituted; A ³ is a substituted or unsubstituted C ₁ to C ₃₀ alkyl group containing at least one fluorine, substituted or not containing at least one fluorine unsubstituted C ₅ to C ₂₀ cycloalkyl containing at least one fluorine or a substituted or unsubstituted C ₆ to C ₂₀ aryl group; B An integer of 1 to 3; A ¹ and A ² are independently a single bond or a substituted or unsubstituted C ₁ to C ₅ alkylene group; T ¹ is a single alkylene oxide 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 claim 1, wherein the first fluorenone resin of the formula 1 comprises a T unit and a T unit as represented by the 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 according to claim 2, 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 claim 1, wherein the first fluorenone resin of the formula 1 comprises a T unit as represented by the formula 1-2: <Formula 1-2> (R ¹ SiO _3/2 ) _x (wherein R ¹ is the same as defined in Formula 1; and x is 1). The composition for a window film according to claim 1, wherein the first fluorenone resin is from the formula 1-1-1 to the formula 1-1-1 and the formula 1-2-1 to the formula 1. One of -2-3 indicates: <Form 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 an ethyl group, Pry is a propyl group, Buty is a butyl group, X is a (meth) acrylate group, Z is represented by the formula A, and W is a formula D means: <Formula A> (where * is the attachment site and X is the (meth) acrylate group), <Formula D> (where * is the attachment site; X is the (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 1-1-1> ((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 an ethyl group, Pry is a propyl group, and Buty is a butyl group) Base, X is a (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 the (meth) acrylate group) <Formula D> (where * is the attachment site, X is the (meth) acrylate group); and 0 < x1 < 1, 0 < x2 < 1, 0 < y < 1, and x1 + x 2 + y = 1)) 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 an ethyl group and Pry is a stretching The propyl group, Buty is a butyl group, and X is a (meth) acrylate group). The composition for a window film according to claim 1, wherein the second fluorenone resin comprises an fluorenone resin represented by Formula 2-1: <Form 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 (wherein 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 claim 6, wherein the second fluorenone resin comprises an fluorenone resin represented by Formula 2-1-1 to Formula 2-1-9: -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 2-6-1> ((X-Pry -O-(C=O)NH-Pry)SiO _3/2 ) _x (FoSiO _3/2 ) _y1 (where Ety is ethyl, Pry is propyl, Buty is butyl, X is (methyl) An acrylate group, 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 an ethyl group, Pry is a propyl group, Buty is a butyl group, and X is ( Methyl) acrylate group; and 0 < x < 1, 0 < y2 < 1, and x + y2 = 1). The composition for a window film according to claim 6, wherein in the formula 2-1, x, y1, and y2 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 claim 1, wherein the crosslinking agent comprises a (meth) acrylate monomer. The composition for a window film according to claim 8, wherein the first fluorenone resin of the formula 1, the second fluorenone resin of the formula 2, and the cross-linking are 100 parts by weight. The first fluorenone resin of the formula 1 is present in an amount of from 10 parts by weight to 80 parts by weight, and the second fluorenone resin of the formula 2 is present in an amount of from 0.1 part by weight to 50 parts by weight, and the presence of 1 The crosslinking agent is added in an amount of 50 parts by weight. The composition for a window film according to claim 1, further comprising: nano particles. The composition for a window film according to claim 11, wherein the nanoparticle is surface-treated with a (meth) acrylate group. The composition for a window film according to claim 11, wherein at least a portion of the first fluorenone resin of the formula 1 is coupled to the nanoparticle to form a composite. The composition for a window film according to claim 11, wherein the nanoparticle has an average particle diameter (D50) of 100 nm or less. The composition for a window film according to claim 11, wherein the nanoparticle comprises cerium oxide. The composition for a window film according to claim 1, further comprising: an alicyclic epoxy resin having an epoxy group. The composition for a window film according to claim 1, further comprising: at least one of the following: an ultraviolet absorber, a reaction inhibitor, an adhesion promoter, a thixotropic agent, a conductivity imparting agent, and a color Conditioning agents, stabilizers, antistatic agents, antioxidants, leveling agents, anti-fingerprint agents and surface energy regulators. A flexible window film comprising: a base layer; and a coating formed on the base layer, wherein the flexible window film has a pencil hardness of 3H or higher and 5.0 mm in a tensile direction Or a radius of curvature of less than 5.0 mm and having a reflected image quality (RIQ) value of 90 or greater. The flexible window film of claim 18, wherein the coating is formed from a composition for a window film as described in any one of claims 1 to 17. The flexible window film of claim 18, wherein the base layer comprises a film stack structure comprising at least two films stacked on top of one another via an adhesive layer. The flexible window film of claim 18, wherein the film stack structure comprises a first film, a second film, and the adhesive layer, the adhesive layer being sandwiched between the first film Between the second film and the second film, the first film is stacked on the second film via the adhesive layer. The flexible window film of claim 21, wherein each of the first film and the second film is selected from the group consisting of a polyester resin, a polycarbonate resin, and a polyimine. At least one of a resin, a poly(meth) acrylate resin, and a cyclic olefin polymer resin is formed. The flexible window film of claim 20, wherein the adhesive layer is formed of an adhesive composition comprising: a monomer mixture of a hydroxyl group-containing (meth)acrylic copolymer; An initiator; and at least one of a macromonomer and an organic nanoparticle. The flexible window film of claim 23, wherein the monomer mixture comprises a hydroxyl group-containing (meth) acrylate and an alkyl group-containing (meth) acrylate. The flexible window film of claim 24, wherein the monomer mixture further comprises a comonomer. The flexible window film according to claim 23, wherein the organic nanoparticle comprises a nanoparticle satisfying the core-shell structure of Equation 1: Tg(c) < Tg(s) (wherein Tg(c) ) is the glass transition temperature of the core (unit: ° C), and Tg (s) is the glass transition temperature (unit: ° C) of the shell. The flexible window film of claim 23, wherein the organic nanoparticle has an average particle diameter of from 10 nm to 400 nm. The flexible window film of claim 21, wherein each of the first film and the second film has a thickness of from 10 micrometers to 100 micrometers, and the adhesive layer has 10 Micron to a thickness of 75 microns.