KR20200061113A - Adhesive sheet for window deco film and window deco film comprising the same - Google Patents

Abstract

The present invention relates to an adhesive sheet for a window decoration film, comprising a flexible layer and an adhesive layer, and to a window decoration film comprising the same and, more specifically, to an adhesive sheet for a window decoration film having excellent adhesion to a curved substrate, and to a window decoration film.

Description

Adhesive sheet for window decoration film and window decoration film including the same{ADHESIVE SHEET FOR WINDOW DECO FILM AND WINDOW DECO FILM COMPRISING THE SAME}

The present invention relates to an adhesive sheet and a window deco film comprising the same, specifically, to an adhesive sheet for a window deco film having excellent adhesive performance and to a window deco film comprising the same.

Recently, as the flexible display (Flexible Display) has been developed, a smart phone, a TV having a curved structure, a monitor of a laptop or computer, and the like have been developed. Accordingly, the glass used as an exterior material of a smartphone, a TV, a laptop or a computer monitor, etc. is being developed in a curved form, and a window deco film that can be attached to the upper part of the curved glass is also being developed. have.

On the other hand, the existing Window Deco Film (Window Deco Film) is a structure in which a release film, an adhesive sheet, a primer layer, a printing layer and a protective film are sequentially stacked. However, when the curvature of the glass used as the exterior material is high, there is a problem in that the adhesion performance of the window deco film attached to the glass in the form of an adherend is significantly reduced. That is, there is a problem in that the adhesive performance of the adhesive sheet included in the window deco film for glass is significantly reduced.

Therefore, there is a need for an adhesive sheet for a window deco film having excellent adhesion to a curved substrate.

Korea Open Publication: 10-2017-0116969 A

Technical problem to be achieved by the present invention is to provide an adhesive sheet for a window deco film having excellent adhesion to a curved substrate and a window deco film comprising the same.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

One embodiment of the present invention is an adhesive layer; And a flexible layer disposed on the adhesive layer, wherein the adhesive layer is a cured product of an adhesive layer composition comprising an acrylate-based resin having a glass transition temperature of -50°C to 30°C, and the acrylate-based resin. Is a polymer of a resin composition comprising an alkyl group-containing (meth)acrylate-based monomer, a heterocycloalkyl group-containing (meth)acrylate-based monomer, and a (meth)acrylic acid-based monomer, wherein the ratio of the thickness of the adhesive layer and the thickness of the flexible layer is It provides a pressure-sensitive adhesive sheet for a window decoration film of 2:3 to 1:2.

Another embodiment of the present invention, a release film; An adhesive sheet for a window deco film according to an exemplary embodiment of the present invention; Printed layer; And it provides a window deco film comprising a protective film sequentially laminated.

The adhesive sheet for window decoration films according to an exemplary embodiment of the present invention has excellent adhesive performance. Specifically, it has excellent adhesion to a curved substrate and adhesion to a printed layer.

The window deco film according to an exemplary embodiment of the present invention has excellent adhesion performance. Specifically, it has excellent adhesion to a curved substrate and adhesion to a printed layer.

In the present specification, when a part is to “include” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated.

In the present specification, "(meth)acrylate" means acrylate or methacrylate.

In the present specification, the unit “parts by weight” may mean a ratio of weights between components.

In the present specification, "monomer" may mean a substance capable of forming a covalent bond in a series of the same or different molecules additionally under the conditions of polymer formation reaction. That is, a "monomer" may be converted into a repeating unit of a polymer sequence, that is, a monomer unit during polymerization reaction to form a polymer.

In the present specification, when a member is said to be positioned “on” another member, this includes not only the case where one member is in contact with the other member but also another member between the two members.

Hereinafter, the present invention will be described in more detail.

One embodiment of the present invention, the adhesive layer; And a flexible layer disposed on the adhesive layer, wherein the adhesive layer is a cured product of an adhesive layer composition comprising an acrylate resin, and the acrylate resin is an alkyl group-containing (meth)acrylate monomer, hetero Provided is a pressure-sensitive adhesive sheet for a window decoration film, which is a polymer of a resin composition containing a cycloalkyl group-containing (meth)acrylate-based monomer and a (meth)acrylic acid-based monomer.

The acrylate-based resin has a glass transition temperature of -50°C to 30°C. Specifically, it may be -50°C or higher-35°C or lower, -50°C or higher-40°C or lower, and more specifically, -50°C or higher-45°C or lower. On the other hand, when the glass transition temperature of the adhesive layer is less than -50°C, the adhesive layer may be soft and may not have cohesive force of the adhesive layer itself. When the glass transition temperature of the adhesive layer is greater than -30°C, the adhesive layer may be hard and thus the adhesive performance of the adhesive sheet for a window decoration film including the adhesive layer may not be good. That is, when the glass transition temperature of the adhesive layer is within the above range, the adhesive sheet for a window deco film can realize excellent adhesive strength. In particular, adhesion to a curved substrate may be excellent.

The ratio of the thickness of the adhesive layer and the thickness of the flexible layer is 2:3 to 1:2. Specifically, the ratio of the thickness of the adhesive layer and the thickness of the flexible layer may be 3:5 to 1:2 or 4:7 to 1:2. When the ratio of the thickness of the adhesive layer and the thickness of the flexible layer is within the above range, the adhesive sheet for a window deco film including the adhesive layer may implement excellent adhesion and excellent adhesion. In particular, adhesion to a curved substrate and adhesion to a printed layer may be excellent.

According to an exemplary embodiment of the present invention, the heterocycloalkyl group-containing (meth)acrylate-based monomer may be 3 parts by weight or more and 15 parts by weight or less with respect to 100 parts by weight of the alkyl group-containing (meth)acrylate-based monomer. Specifically, it may be 5 parts by weight or more and 15 parts by weight or less, 5 parts by weight or more and 12 parts by weight or less, 10 parts by weight or more and 15 parts by weight or less, or 12 parts by weight or more and 15 parts by weight or less. When the content of the heterocycloalkyl group-containing (meth)acrylate-based monomer is within the above range, the acrylate-based resin can have a glass transition temperature within a certain range, so that the adhesive sheet for window deco film can realize excellent adhesion performance. have.

In addition, the heterocycloalkyl group-containing (meth)acrylate-based monomer can be combined with moisture, and the adhesive layer containing it in a content within the above range is excellent in durability under high temperature and high humidity conditions and may not cause cloudiness.

According to an exemplary embodiment of the present invention, the (meth) acrylic acid-based monomer may be 1 part by weight or more and 12 parts by weight or less with respect to 100 parts by weight of the resin composition. Specifically, it may be 1 part by weight or more and 8 parts by weight or less, and more specifically, 3 parts by weight or more and 6 parts by weight or less. When the content of the (meth)acrylic acid-based monomer is within the above range, the hardness of the adhesive layer may be improved, and cohesion may be improved. Further, it is possible to improve the adhesion of the adhesive layer.

The alkyl group-containing (meth)acrylate-based monomers are methyl (meth)acrylate monomer, ethyl (meth)acrylate monomer, n-propyl (meth)acrylate monomer, isopropyl (meth)acrylate monomer, n-butyl ( Meth)acrylate monomer, t-butyl (meth)acrylate monomer, sec-butyl (meth)acrylate monomer, pentyl (meth)acrylate monomer, 2-ethylhexyl (meth)acrylate monomer, 2-ethylbutyl ( It may be one or more selected from meth)acrylate monomers, n-octyl (meth)acrylate monomers, and isooctyl (meth)acrylate monomers.

According to an exemplary embodiment of the present invention, the heterocycloalkyl group-containing (meth)acrylate-based monomer may include a ring structure in which hetero bonds other than carbon are present without an unsaturated bond in the heterocycloalkyl group, and have 2 or more carbon atoms. It may include 20 or less monocyclic rings or polycyclic rings.

According to an exemplary embodiment of the present invention, the heterocycloalkyl group-containing (meth)acrylate-based monomer is a tetrahydrofurfuryl (meth)acrylate monomer, a tetrahydropyranyl (meth)acrylate monomer, an acryloylmorpholine monomer And it may be one or more selected from cyclic trimethylol propane foam acrylate monomer.

According to an exemplary embodiment of the present invention, the (meth)acrylic acid-based monomer is an acrylic acid monomer, a methacrylic acid monomer, a 2-carboxyethyl acrylic acid monomer, a 3-carboxypropyl acrylic acid monomer, and a 2-(meth)acryloyloxyacetic acid monomer , 3-(meth)acryloyloxypropyl acid monomer and 4-(meth)acryloyloxybutyl acid monomer.

The acrylate-based resin may be prepared by photopolymerization or thermal polymerization of a resin composition containing an alkyl group-containing (meth)acrylate-based monomer, a heterocycloalkyl group-containing (meth)acrylate-based monomer, and a (meth)acrylic acid-based monomer. The resin composition may further include a solvent, a photoinitiator or a thermal initiator, antioxidant, UV absorber, surfactant, etc., but is not limited thereto.

According to an exemplary embodiment of the present invention, the thickness of the adhesive layer may be 5 μm or more and 100 μm or less, and the thickness of the flexible layer may be 5 μm or more and 200 μm or less. When the thickness of the adhesive layer and the thickness of the flexible layer are within the above range, the adhesive sheet for a window deco film may realize excellent adhesion and at the same time excellent adhesion.

The flexible layer disposed on the adhesive layer is a cured product of a flexible layer composition comprising a polycarbonate-based urethane oligomer having a weight average molecular weight of 2,000 g/mol or more and 7,000 g/mol or less and a (meth)acrylate-based monomer containing a cycloalkyl group. The content of the cycloalkyl group-containing (meth)acrylate-based monomer may be 60 parts by weight or more and 80 parts by weight or less with respect to 100 parts by weight of the flexible layer composition. The adhesive sheet according to an exemplary embodiment of the present invention can implement excellent adhesion by including the flexible layer. Specifically, it is possible to implement excellent adhesion to the printed layer of the window decor film.

According to an exemplary embodiment of the present invention, the weight average molecular weight of the polycarbonate-based urethane oligomer included in the flexible layer composition is 2,000 g/mol or more and 7,000 g/mol or less. Specifically, the weight average molecular weight of the polycarbonate-based urethane oligomer may be 3000 g/mol or more and 6000 g/mol or less, 4000 g/mol or more, 5000 g/mol or 4500 g/mol or more and 5500 g/mol or less. On the other hand, when the weight average molecular weight of the polycarbonate-based urethane oligomer is less than 2,000 g/mol, the flexible layer may be soft and sticky components may be exposed. In addition, when the weight average molecular weight of the polycarbonate-based urethane oligomer is more than 7,000 g/mol, the adhesiveness may be deteriorated because the flexible layer is hard and the flexibility is poor. That is, when the weight average molecular weight of the polycarbonate-based urethane oligomer satisfies the above range, the adhesive sheet for window deco film can realize excellent adhesion. Specifically, it is possible to implement excellent adhesion to the printed layer.

According to an exemplary embodiment of the present invention, the content of the cycloalkyl group-containing (meth)acrylate-based monomer is 60 parts by weight or more and 80 parts by weight or less compared to 100 parts by weight of the flexible layer composition. Specifically, the content of the cycloalkyl group-containing (meth)acrylate-based monomer is 60 parts by weight or more and 70 parts by weight or less, 70 parts by weight or more, 80 parts by weight or less, or 65 parts by weight or more and 75 parts by weight or more, based on 100 parts by weight of the flexible layer composition It may be: On the other hand, when the content of the cycloalkyl group-containing (meth)acrylate-based monomer is less than 60 parts by weight, the flexibility of the flexible layer is poor and the adhesion to the curved substrate may deteriorate. In addition, when the content of the cycloalkyl group-containing (meth)acrylate-based monomer is more than 80 parts by weight, the flexible layer is too soft, so that a sticky component may be exposed because the monomer having a small weight average molecular weight is excessively included. That is, when the content of the cycloalkyl group-containing (meth)acrylate-based monomer is within the above range, the flexible layer is softened by softening the flexible layer by containing a large amount of monomers having a smaller weight average molecular weight than the polycarbonate-based urethane oligomer in the flexible layer composition. The adhesive sheet for the deco film can realize excellent adhesion. Specifically, it is possible to implement excellent adhesion to a curved substrate.

According to an exemplary embodiment of the present invention, the cycloalkyl group-containing (meth)acrylate-based monomer includes cyclohexyl (meth)acrylate, isobornyl (meth)acrylate, 3,3,5-trimethylcyclohexylacrylate, and It may be one or more selected from acryloyl morpholine. Further, instead of the cycloalkyl group-containing (meth)acrylate-based monomer, N-(2-hydroxypropyl) methacrylate or methyl methacrylate, which is a monomer having a high glass transition temperature, may be used.

According to an exemplary embodiment of the present invention, the glass transition temperature of the cycloalkyl group-containing (meth)acrylate-based monomer may be 60°C or more and 100°C or less. Specifically, it may be 60 °C or more and 90 °C or less, or 60 °C or more and 80 °C or less. When the glass transition temperature of the cycloalkyl group-containing (meth)acrylate-based monomer is within the above range, evaluation of the molding layer of the pressure-sensitive adhesive sheet for a window deco film can be achieved as well as excellent adhesion.

According to an exemplary embodiment of the present invention, the content of the polycarbonate-based urethane oligomer may be 20 parts by weight or more and 40 parts by weight or less compared to 100 parts by weight of the flexible layer composition. Specifically, the content of the polycarbonate-based urethane oligomer may be 30 parts by weight or more and 40 parts by weight or less, 20 parts by weight or more, 30 parts by weight or less, or 25 parts by weight or more and 35 parts by weight or less compared to 100 parts by weight of the flexible layer composition. When the content of the polycarbonate-based urethane oligomer is within the above range, the flexible layer is soft, so that the evaluation of the molding layer coating of the adhesive sheet for window deco film is not only good, but also excellent adhesion can be realized.

According to an exemplary embodiment of the present invention, the polycarbonate-based urethane oligomer may be a polymer of a composition comprising a polycarbonate diol and a diisocyanate-based compound. Specifically, the polycarbonate-based urethane oligomer may be a compound in which the components are copolymerized by a urethane bond.

Since the polycarbonate-based urethane oligomer used in one embodiment of the present invention has excellent heat and moisture resistance and can maintain the strength of the flexible layer constant, the adhesive sheet according to one embodiment of the present invention can implement excellent adhesion. .

According to an exemplary embodiment of the present invention, the polycarbonate diol can be obtained by reacting diols and carbonates. The diols are, for example, ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexane Diol, 1,9-nonanediol, 1,8-nonanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, bisphenol-A, etc. have. Further, the carbonates may be, for example, dimethyl carbonate, diphenyl carbonate, ethylene carbonate, or phosgene.

According to an exemplary embodiment of the present invention, the diisocyanate-based compound is, for example, 4,4-diphenylmethane diisocyanate, xylylene diisocyanate, isophorone diisocyanate (IPDI), 4,4-dicyclohexylmethane Diisocyanate, 1,3-cyclohexanebismethyl isocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, and the like.

Another embodiment of the present invention, a release film; An adhesive sheet for a window deco film according to an exemplary embodiment of the present invention; It is possible to provide a window decor film comprising a printed layer and a protective film sequentially stacked. The window decor film may not be peeled off even when attached to glass having a high curvature due to the excellent adhesion performance of the adhesive sheet for the window decor film.

The adhesive sheet may be prepared by sequentially applying the adhesive layer composition and the flexible layer composition on a release film and curing at a time.

The window decor film is coated with the adhesive sheet for the window decor film on top of the PET sheet corresponding to the release film, and after the adhesive sheet for the decor film is further laminated with another PET sheet corresponding to the printing layer, the irradiation energy is It can be formed by photocuring with light of 1000 mJ/cm ² for 3 to 7 minutes.

The window deco film may be attached to a glass substrate having a curved structure and a polyimide substrate of a flexible display.

Hereinafter, examples will be described in detail to specifically describe the present invention. However, the embodiments according to the present invention may be modified in various other forms, and the scope of the present invention is not interpreted to be limited to the embodiments described below. The embodiments of the present specification are provided to more fully describe the present invention to those skilled in the art.

Example  One

Irradiation energy of a composition comprising 100 parts by weight of 2-ethylhexyl acrylate (2-EHA) monomer, 14.3 parts by weight of tetrahydroperfuryl methacrylate (THFMA) monomer, 4.8 parts by weight of acrylic acid (AA) monomer, and 0.1 parts by weight of photoinitiator An acrylate-based resin was prepared by photopolymerizing with light of 1000 mJ/cm ² for 5 minutes. The glass transition temperature of the acrylate-based resin was-50 ℃

30 parts by weight of the acrylate-based resin, 2-EHA, THFMA, and AA as diluent monomers, each containing 58.8 parts by weight, 8.4, and 2.8 parts by weight, 0.2 parts by weight of HDDA as a curing agent, and 0.1 parts by weight of Irgacure 651 as a photoinitiator. An adhesive layer composition was prepared.

After adding 2 equivalents of isophorone diisocyanate (IPDI) to 1 equivalent of polycarbonate diol having a weight average molecular weight of about 1150 g/mol, heat-polymerizing at 70°C for 8 hours, polycarbonate having a weight average molecular weight of 5,000 g/mol Based urethane oligomer was prepared.

20 parts by weight of the polycarbonate-based urethane oligomer, 80 parts by weight of cyclohexyl methacrylate (CHMA) monomer, 0.2 parts by weight of 1,6-hexanediol diacrylate (HDDA) as a curing agent, and 0.1 weight of Irgacure 651 as a photoinitiator A flexible layer composition containing parts was prepared.

The flexible layer composition and the adhesive layer composition are sequentially applied on the release PET, and the release PET is placed on the adhesive layer composition, and then light-cured with light having an irradiation energy of 1000 mJ/cm ² at a time for 5 minutes to adhere to the window deco film. A release PET/flexible layer/adhesive layer/release PET containing sheet was prepared.

The adhesive layer had a thickness of 28 μm, and the flexible layer had a thickness of 52 μm.

Example  2

In Example 1, except for adjusting the thickness of the adhesive layer and the thickness of the flexible layer to 25 μm and 50 μm, respectively, an adhesive sheet for window deco film was prepared in the same manner as in Example 1.

Comparative example  One

In Example 1, except for adjusting the thickness of the adhesive layer and 37.5 μm and 37.5 μm of the flexible layer, an adhesive sheet for window deco film was prepared in the same manner as in Example 1.

Comparative example  2

In Example 1, a composition comprising 100 parts by weight of a 2-ethylhexyl acrylate (2-EHA) monomer, 13.3 parts by weight of a tetrahydrofurfuryl methacrylate (THFMA) monomer, 20 parts by weight of an acrylic acid (AA) monomer, and a photoinitiator An adhesive sheet for window decoration film was prepared in the same manner as in Example 1, except that an acrylate-based resin having a glass transition temperature of -20° C. was prepared by photopolymerization.

Adhesion  evaluation

A molding liquid (KDP1002D, KCC) was applied onto the flexible layer of the adhesive sheets of Example 1, 2 and Comparative Examples 1 and 2 (size: width * length = 20 cm * 20 cm), and photocured to 20 μm thick A molding layer was formed. Subsequently, the molding layer is a flexible layer through a cross-cut method of cutting a grid of 100 squares on a molding layer using a crosscutter as a cutting guide in accordance with ASTM D3359, and then removing the grid with Nichiban Tape. It was checked whether it falls off, and the adhesion was evaluated.

○: Molding layer does not fall

Ⅹ: The molding layer is completely separated from the flexible layer

Peeling force  evaluation

The adhesive layers of the adhesive sheets prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were attached using a 2 kg roller to adhere to a 1.1 T thick glass substrate, and 30 to an autoclave (60° C., 7 bar). After leaving for a minute, the peeling force was measured by ASTM D903 at a peeling angle of 180° at a constant temperature and humidity condition of 25° C. and 25 RH%.

When the peeling force was 2,000 gf/in or more, ○, and when it was 2,000 gf/in or less, it was represented by Ⅹ to evaluate the peeling force.

Cloudiness  Prevention performance evaluation

The adhesive layers of the adhesive sheets prepared in Examples 1 and 2 and Comparative Examples 1 and 2 were attached using a 2 kg roller to adhere to a 1.1 T-thick glass substrate, and 20 to an autoclave (40° C., 4 bar). After leaving for a minute, it was put into a thermo-hygrostat at 80°C and 85 RH%, and when it was taken out after 3 days, it was evaluated that the cloudiness prevention performance was ○ when no turbidity occurred and Ⅹ when it occurred.

To evaluate the physical properties of the adhesive sheet according to Examples 1 and 2 and Comparative Examples 1 and 2, it is shown in Table 1 below.

Thickness ratio of adhesive layer and flexible layer Glass transition temperature of acrylate resin
(℃) Adhesion Peeling force Cloudiness prevention performance Example 1 2:3 -50 ○ ○ ○ Example 2 1:2 -50 ○ ○ ○ Comparative Example 1 1:1 -50 Ⅹ ○ ○ Comparative Example 2 2:3 -20 ○ Ⅹ ○

As shown in Table 1, it was confirmed that the adhesive sheets of Examples 1 and 2 were excellent in adhesion and peel strength while maintaining anti-cloudiness performance.

On the other hand, in Comparative Example 1, since the thickness ratio of the adhesive layer and the flexible layer is outside the range of 2:3 to 1:2, that is, it is confirmed that the adhesiveness is not excellent because the thickness of the flexible layer is thinner than the adhesive layer. Could. In addition, in the case of Comparative Example 2 in which the glass transition temperature of the acrylate-based resin exceeded -30°C, it was confirmed that the adhesive layer was hard and the viscosity of the surface disappeared, so that peeling strength, that is, adhesion was not excellent.

Therefore, it can be seen that the adhesive sheet for a window deco film according to the present invention has excellent adhesive performance. Specifically, it can be seen that the adhesion to the curved substrate and the adhesion to the printed layer are excellent.

Claims (8)

Adhesive layer; And a flexible layer disposed on the adhesive layer,
The adhesive layer is a cured product of an adhesive layer composition comprising an acrylate-based resin having a glass transition temperature of -50°C to 30°C,
The acrylate-based resin is a polymer of a resin composition comprising an alkyl group-containing (meth)acrylate-based monomer, a heterocycloalkyl group-containing (meth)acrylate-based monomer, and a (meth)acrylic acid-based monomer,
The ratio of the thickness of the adhesive layer and the thickness of the flexible layer is a 2:3 to 1:2 adhesive sheet for window decoration films.
According to claim 1,
The heterocycloalkyl group-containing (meth)acrylate-based monomer is an adhesive sheet for a window deco film having 3 parts by weight or more and 15 parts by weight or less with respect to 100 parts by weight of the alkyl group-containing (meth)acrylate-based monomer.
According to claim 1,
The (meth)acrylic acid-based monomer is an adhesive sheet for a window deco film having 1 part by weight or more and 12 parts by weight or less with respect to 100 parts by weight of the (meth)acrylate-based monomer containing the alkyl group.
According to claim 1,
The alkyl group-containing (meth)acrylate-based monomers are methyl (meth)acrylate monomer, ethyl (meth)acrylate monomer, n-propyl (meth)acrylate monomer, isopropyl (meth)acrylate monomer, n-butyl ( Meth)acrylate monomer, t-butyl(meth)acrylate monomer, sec-butyl(meth)acrylate monomer, pentyl(meth)acrylate monomer, 2-ethylhexyl(meth)acrylate monomer, 2-ethylbutyl( A pressure-sensitive adhesive sheet for a window decoration film selected from at least one selected from meth)acrylate monomers, n-octyl (meth)acrylate monomers, and isooctyl (meth)acrylate monomers.
According to claim 1,
The heterocycloalkyl group-containing (meth)acrylate-based monomers are tetrahydrofurfuryl (meth)acrylate monomer, tetrahydropyranyl (meth)acrylate monomer, acryloylmorpholine monomer, and cyclic trimethylolpropane foam acrylate Adhesive sheet for window decoration film selected from monomers.
According to claim 1,
The (meth) acrylic acid-based monomers are acrylic acid monomers, methacrylic acid monomers, 2-carboxyethyl acrylic acid monomers, 3-carboxypropyl acrylic acid monomers, 2-(meth)acryloyloxyacetic acid monomers, 3-(meth)acryloyl A pressure-sensitive adhesive sheet for a window deco film of at least one selected from oxypropyl acid monomers and 4-(meth)acryloyloxybutyl acid monomers.
According to claim 1,
The adhesive layer has a thickness of 5 μm or more and 100 μm or less, and the flexible layer has a thickness of 5 μm or more and 200 μm or less.
Release film; The adhesive sheet for window decoration films according to any one of claims 1 to 7; Printed layer; And a protective film sequentially laminated.