KR20220092703A - Interior film and method for preparing the same - Google Patents

Abstract

The present invention relates to an interior film. More specifically, the present invention comprises the base layer and a scratch resistance layer formed on the base layer, wherein the scratch resistance layer comprises aluminum oxide particles, and shows an effect of further strengthening the scratch resistance and abrasion resistance of the interior film by enabling the aluminum oxide particles from not protruding on a surface of the scratch resistance layer.

Description

Interior film and manufacturing method thereof

The present invention relates to an interior film used as a finishing material for the interior or exterior of buildings, home appliances, electronic products, interior/exterior materials for automobiles, furniture, doors, and advertising materials.

The interior film is an interior means that imparts decorative beauty such as various patterns or three-dimensional shapes to the interior or exterior of a building, home appliances, electronic products, interior/exterior materials for automobiles, furniture, doors, and advertisement materials.

When an interior film is used in a space with a large flow of people or a scratch is vulnerable, there is a problem that scratches or abrasion easily occur, so research and development to improve the scratch resistance and abrasion resistance of the interior film is continuing.

Korean Patent Registration No. 10-1571189 relates to a decorative sheet including a substrate layer and a scratch-resistant layer. The scratch-resistant layer includes hard particles uniformly dispersed in a transparent resin. However, since the hard particles protrude on the surface of the scratch-resistant layer, there may be a problem in that the protruding hard particles are easily abraded, thereby reducing the decorative effect.

Korean Patent Application Laid-Open No. 10-2016-0140817 relates to articles that can be used as decorative laminates and films. The article includes a polymer layer and a first layer formed on the polymer layer, and has a structure with microspheres disposed along a surface of the first layer. It is described that the microspheres serve to impart aesthetics and improve abrasion resistance due to a low coefficient of friction, but since they are formed to protrude to the surface of the first layer, there is a problem that there is still a high probability of scratches or wear. .

As described above, since scratch resistance and abrasion resistance of the conventional interior film are still recognized as areas to be improved, it is necessary to develop a high hardness interior film in order to solve this problem.

Korean Patent Registration No. 10-1571189 Korean Patent Publication No. 10-2016-0140817

It is an object of the present invention to provide a high hardness interior film having improved scratch resistance and abrasion resistance.

Another object of the present invention is to provide a method for manufacturing a high hardness interior film having improved scratch resistance and abrasion resistance.

In order to achieve the above object, the present invention provides a base layer; and a scratch-resistant layer formed on one surface of the base layer, wherein the scratch-resistant layer includes a transparent resin layer and a surface layer formed on the transparent resin layer, wherein the surface layer includes aluminum oxide particles dispersed in the surface treatment agent provides interior films that

The surface layer may further include organic particles, and the aluminum oxide particles and organic particles included in the surface layer may not protrude to the surface of the surface layer.

The interior film according to the present invention exhibits improved scratch resistance and abrasion resistance by preventing aluminum oxide particles capable of improving hardness from protruding on the surface.

1A and 1B are longitudinal cross-sectional views of an interior film according to an exemplary embodiment of the present invention.
2A and 2B are longitudinal cross-sectional views of an interior film according to another exemplary embodiment of the present invention.
3A and 3B are longitudinal cross-sectional views of an interior film according to another exemplary embodiment of the present invention.

The embodiments provided according to the present invention can all be achieved by the following description. It is to be understood that the following description is to be understood as describing preferred embodiments of the present invention, and the present invention is not necessarily limited thereto.

As used herein, the term “interior film” refers to a film or sheet that can be attached to a part to be decorated or to give aesthetics. The application use of the interior film may be a finishing material for the interior or exterior of a building, home appliances, electronic products, interior/exterior materials for automobiles, furniture, doors, and advertisement materials, but is not limited thereto.

interior film

The present invention relates to an interior film having improved scratch resistance and abrasion resistance.

1A and 1B are longitudinal cross-sectional views of an interior film according to an exemplary embodiment of the present invention.

1A and 1B , an interior film 1 according to an exemplary embodiment of the present invention includes a base layer 10; and a scratch-resistant layer 20 formed on the base layer 10, wherein the scratch-resistant layer 20 includes a transparent resin layer 21 and a surface layer 22 formed on the transparent resin layer 21. Including, the surface layer 22 may include aluminum oxide particles (P1) dispersed in the surface treatment agent, and additionally, organic particles (P2).

The particle diameters of the aluminum oxide particles (P1) and the organic particles (P2) are smaller than the thickness of the surface layer 32, and the particles do not protrude from the surface of the surface layer 32 and are dispersed inside the surface layer 32. . Accordingly, the surface of the surface layer 32 is formed so that particles do not protrude, and thus has excellent wear resistance.

In the present invention, the base layer may impart mechanical properties to the interior film. Specifically, the base layer can support the scratch-resistant layer so that the film shape can be maintained, and also protect the scratch-resistant layer to enhance weather resistance and durability.

The base layer is polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (polypropylene, PP), polyethylene (polyethylene, PE), acrylonitrile-butadiene-styrene (acrylonitrile-butadiene- It may include one or more plastic resins selected from the group consisting of styrene, ABS), polycarbonate (PC), and polymethylmethacrylate (PMMA), and preferably includes polyvinyl chloride. have.

The thickness of the base layer may be 0.01 mm to 0.3 mm. Specifically, the thickness of the base layer may be 0.01 mm or more, 0.05 mm or more, or 0.08 mm or more, and may be 0.15 mm or less, 0.2 mm or less, or 0.3 mm or less. The thickness of the base layer is not particularly limited, but when it satisfies the above range, it may be advantageous for maintaining the shape of the interior film, enhancing weather resistance and durability. If the thickness of the base layer is less than 0.01 mm, weather resistance and durability may be deteriorated, and it may be difficult to maintain in the form of a film, and if it exceeds 0.3 mm, the overall thickness of the interior film may be thickened, thus limiting the application use, handling This can be difficult.

In the present invention, the scratch-resistant layer may include a transparent resin layer and a surface layer formed on the transparent resin layer.

The transparent resin layer may protect the printing layer from scratches or external contamination.

In addition, the transparent resin layer may include a transparent thermoplastic resin. The transparent thermoplastic resin is polyvinyl chloride (polyvinyl chloride, PVC), acrylonitrile-butadiene-styrene (ABS), polycarbonate (polycarbonate, PC), styrene-acrylonitrile (styrene-acrylonitrile, SAN) and polymethylmethacrylate (PMMA) may include at least one selected from the group consisting of.

The thickness of the transparent resin layer may be 0.01 mm to 0.1 mm. Specifically, the thickness of the base layer may be 0.01 mm or more, 0.02 mm or more, or 0.03 mm or more, and may be 0.08 mm or less, 0.09 mm or less, or 0.1 mm or less. The thickness of the transparent resin layer is not particularly limited, but when it satisfies the above range, it may be advantageous for maintaining the shape of the interior film, enhancing weather resistance and durability. If the thickness of the transparent resin layer is less than 0.01 mm, it is difficult to manage the thickness of the transparent resin layer, so the thickness deviation increases. If it is more than 0.3 mm, the overall thickness of the interior film may be thick, so that the application use may be limited, and handling may become difficult.

The surface layer is an outermost layer of the interior film formed on one surface of the transparent resin layer. Since the surface layer has a shape in which the surface is not protruded by the aluminum oxide particles and/or organic particles, scratch resistance and abrasion resistance of the interior film may be enhanced.

The surface layer having a surface that does not protrude by the particles can be controlled by the viscosity of the surface treatment agent included in the surface layer, the smoothness of the transparent resin layer and the control of the coating equipment when coating the surface layer.

In addition, by controlling the viscosity of the surface treatment agent, it is possible to prevent particles included in the surface layer from protruding through the surface layer interface.

In addition, it is possible to prevent the particles from protruding from the surface of the surface layer by (a) the constituent material of the surface layer and (b) the coating and curing method.

In the aspect of the (a) constituent material, the surface layer includes a surface treatment agent, aluminum oxide particles and organic particles. In the surface layer, the aluminum oxide particles and organic particles are dispersed in the surface treatment agent, so that the particles do not protrude to the surface of the surface layer.

The aluminum oxide particles and the organic particles have a higher specific gravity than the surface treatment agent, and tend to sink in the surface treatment agent, so that they do not protrude to the surface.

The specific gravity of the surface treatment agent is 0.4 to 1.2, the specific gravity of the aluminum oxide particles is more than 1.2 to 5.0, and the specific gravity of the organic particles is 0.6 to 1.5. At this time, the specific gravity may be measured using a conventional hydrometer, for example, may be measured using a digital electronic hydrometer (ALFA MIRAGE, MD300S). When the surface treatment agent, the aluminum oxide particles, and the organic particles all satisfy the specific gravity range, the particles do not protrude to the surface of the surface layer and may be uniformly dispersed in the treatment agent. In addition, the specific gravity may be measured under constant temperature and constant humidity conditions, for example, may be measured under 25 ℃ and 50% humidity.

The surface treatment agent may include a material capable of enhancing the strength of the surface layer, methyl ethyl ketone, amorphous silica, N,N-dimethylacrylamide (N,N-dimethylacrylamide), It may include urethane acrylate oligomer and (1-hydroxycyclohexyl)phenylmethanone).

Specifically, the surface treatment agent is amorphous silica 0.1 to 20% by weight; 20 to 40 wt% of N,N-dimethylacrylamide; 20 to 40 wt% of urethane acrylic acid oligomer; and 1 to 20 wt% of (1-hydroxycyclohexyl)phenylmethanone; it may include. In addition, the surface treatment agent may further include methyl ethyl ketone, and the methyl ethyl ketone may be included in an amount of greater than 0% by weight and not more than 53% by weight based on the total weight of the surface treatment agent. If even one of the components included in the surface treatment agent is not included in the weight range, the specific gravity of the surface treatment agent is excessively decreased or increased. Accordingly, the strength of the surface layer is lowered, and scratch resistance is not good, and the aluminum oxide particles and organic particles protrude to the surface of the surface layer, so that the abrasion resistance may not be good.

In addition, the surface treatment agent may be included in an amount of 50 to 99% by weight based on the total weight of the surface layer. Specifically, the content of the surface treatment agent may be 55 wt% or more, 75 wt% or more, 85 wt% or more, or 95 wt% or more, and may be 97 wt% or less, 90 wt% or less, or 85 wt% or less.

The aluminum oxide particles may be hard particles having a strong strength compared to the surface treatment agent, a specific gravity of 1.0 to 5.0, and a particle diameter of 1 μm to 12 μm. Specifically, the particle diameter of the aluminum oxide particles may be 1 μm or more, 5 μm or more, or 10 μm or more, or 5 μm or less, 12 μm or less, or 7 μm or less. If the particle diameter of the aluminum oxide particles is less than 1 μm, the degree of improvement in strength of the surface layer may be insignificant, so that the effect of strengthening scratch resistance may be insignificant, and if it exceeds 10 μm, it may protrude to the surface of the surface layer.

In addition, the aluminum oxide particles may be included in an amount of 1 to 5% by weight based on the total weight of the surface layer. Specifically, the content of the aluminum oxide particles may be 1 wt% or more, 1.5 wt% or more, or 2 wt% or more, and may be 4 wt% or less, 4.5 wt% or less, or 5 wt% or less. If the content of the aluminum oxide particles is less than 1% by weight, scratch resistance may not be improved due to insignificant improvement in strength of the surface layer, and if it exceeds 5% by weight, the hardness of the interior film is excessive and it may be difficult to handle .

The organic particles may further enhance the hardness of the surface layer to improve scratch resistance of the interior film.

The organic particles may include at least one selected from the group consisting of acrylic beads, polyurethane beads, and polystyrene beads. Considering the compatibility with the surface treatment agent and the effect of strengthening the hardness of the surface layer, the organic particles may include acrylic beads.

In addition, the organic particles may be coated with silica. When the silica-coated organic particles are used, hardness, slip properties and adhesion may be improved. Silica coated on the surface of the organic particles may improve slip properties while floating to the surface.

In addition, the organic particles may have a specific gravity of 0.6 to 1.5 and a particle diameter of 1 μm to 12 μm. Specifically, the particle diameter of the organic particles may be 1 μm or more, 2 μm or more, or 3 μm or more, or 5 μm or less, 7 μm or less, or 12 μm or less. If the particle diameter of the organic particles is less than 1 μm, the degree of improvement in strength of the surface layer may be insignificant, so that the scratch resistance strengthening effect may be insignificant, and if it exceeds 10 μm, it may protrude to the surface of the surface layer. If the organic particles are coated with silica, the particle diameter of the organic particles is meant to include all the parts coated with silica.

In addition, the organic particles may be included in an amount of 1 to 5% by weight based on the total weight of the surface layer. Specifically, the content of the organic particles may be 1 wt% or more, 1.5 wt% or more, or 2 wt% or more, and may be 4 wt% or less, 4.5 wt% or less, or 5 wt% or less. If the content of the organic particles is less than 1% by weight, the degree of improvement in strength of the surface layer may not be improved, and if it exceeds 5% by weight, the hardness of the interior film may be excessive and difficult to handle.

In addition, in the aspect of the curing method (b), it is possible to form a surface layer in which the surface is not protruded by particles by UV curing, thermal curing, or electron beam (EB) curing, and in terms of strength or commercialization UV curing can be applied. When the heat curing is applied, the strength may be somewhat lowered, and if the electron beam curing is applied, there may be a problem of an increase in cost.

The UV curing refers to a method of curing within a short time of seconds (sec) by applying a UV treatment agent to the object to be coated and irradiating ultraviolet rays.

In order to form the surface layer, by applying a composition for forming a surface layer comprising the surface treatment agent, aluminum oxide particles and organic particles on the transparent resin layer and performing UV curing, the aluminum oxide particles and organic particles do not protrude A surface layer having a shape surface may be formed. At this time, the application may be a gravure coating method, for example, may be micro-gravure, and in addition, the application may be performed using a comma corner method.

The thickness of the surface layer thus formed may be 1 μm to 20 μm. Specifically, the thickness of the surface layer may be 1 μm or more, 3 μm or more, or 7 μm or more, and may be 10 μm or less, 12 μm or less, 15 μm or less, or 20 μm or less. When the thickness of the surface layer is less than 1 μm, the aluminum oxide particles and organic particles may protrude to the surface. If the thickness of the surface layer is more than 20 μm, the overall thickness of the interior film may be thickened, and thus use may be limited.

In the present invention, the interior film may further include an adhesive layer and a release layer at the lower end of the base layer.

2A and 2B are longitudinal cross-sectional views of an interior film according to another exemplary embodiment of the present invention.

2A and 2B , the interior film 1 according to another embodiment of the present invention includes a base layer 10; and a scratch-resistant layer 20 formed on the base layer 10 , wherein an adhesive layer 30 and a release layer 40 are sequentially formed on a lower surface of the base layer 10 .

In the present invention, the adhesive layer may allow the interior film to be adhered to a portion to which the interior film is to be applied. In addition, the adhesive layer provides excellent interfacial adhesion and moisture resistance to the interior film, so that the interior film exhibits excellent durability even when exposed to an external environment for a long time.

The pressure-sensitive adhesive layer may include at least one selected from the group consisting of an acrylic pressure-sensitive adhesive, a vinyl-based pressure-sensitive adhesive, a polyurethane-based pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive, but is not limited thereto as long as it is a pressure-sensitive adhesive commonly used in the art.

In addition, the thickness of the adhesive layer may be 20 μm to 60 μm. Specifically, the thickness of the adhesive layer may be 20 μm or more, 25 μm or more, or 30 μm or more, and may be 50 μm or less, 55 μm or less, or 60 μm or less. If the thickness of the adhesive layer is less than 20 μm, the adhesive force may be reduced, and if it exceeds 60 μm, the attached interior film may be pushed and its shape may be distorted.

In the present invention, the release layer is a layer that is peeled off and removed before the interior film is applied to a specific object, and protects the adhesive layer in the product state of the interior film to facilitate distribution of the interior film, and It plays a role in maintaining shape and physical properties from manufacturing to construction.

The release layer may include a wide range of release agents, release films, release sheets, etc. commonly used in the art, and is not particularly limited. For example, the release layer includes one or more release agents selected from the group consisting of epoxy-based, epoxy-melamine-based, amino alkyd-based, acrylic-based, melamine-based, silicone-based, fluorine-based, cellulose-based, urea resin-based, polyolefin-based, and paraffin-based release agents. can do.

In addition, the thickness of the release layer may be 0.1 to 5 ㎛. Specifically, the thickness of the release layer may be 0.1 μm or more, 0.5 μm or more, or 1 μm or more, and may be 3 μm or less, 4 μm or less, or 5 μm or less. When the thickness of the release layer is included in the above range, peeling from the adhesive layer is easy and excellent processability can be secured in the process of forming the adhesive layer thereon. If the thickness of the release layer is less than 0.1 μm, the release layer may be torn when peeled from the adhesive layer, and the release layer may be damaged or difficult to form the adhesive layer in the process of forming the adhesive layer on the release layer. If the thickness of the release layer is more than 5 μm, peeling from the adhesive layer may not be easy, and the thickness of the interior film may be thick, so transportation may be difficult in the distribution process.

The interior film as described above may have pencil hardness (test standard: KS M ISO 15184) of 8H or more, abrasion resistance (test standard: JIS K 7204) may be (5,000 times) or more, and adhesive strength may be 1000 g/in or more and dimensional stability may be less than 0.4 mm.

In the present invention, the interior film may further include a printed layer on the base layer.

3A and 3B are longitudinal cross-sectional views of an interior film according to another exemplary embodiment of the present invention.

3A and 3B , the interior film 1 according to another embodiment of the present invention includes a base layer 10; It includes a printed layer 50 formed on the base layer 10 and a scratch-resistant layer 20 formed on the printed layer 50 .

The print layer 50 is an optional component that may be additionally formed when it is necessary to impart various colors or patterns to the interior film. A material or method for forming the printed layer 50 may be a known material or method without limitation.

By forming a color or pattern on the print layer 50 , the interior film may exhibit a color or pattern. For example, by printing with ink and laminating the printed layer 50 and the base layer 10 having a color or pattern formed thereon, the scratch-resistant layer 20 is formed to form the scratch-resistant layer 20 to form the interior film can be manufactured.

For example, by forming a pattern on the print layer 50 , the surface of the interior film may be embossed. The embossing refers to a shape in which the surface has a convex shape.

Manufacturing method of interior film

The present invention also provides a method for manufacturing the interior film. The structure and constituent materials of the interior film are the same as described above.

The manufacturing method of the interior film,

(S1) forming a scratch-resistant layer by forming a surface layer containing aluminum oxide particles on the transparent resin layer; and

(S2) making the transparent resin layer in contact with one surface of the base layer, and laminating a scratch-resistant layer on the base layer;

In addition, (S3) after forming a release layer on one surface of the adhesive layer, the step of laminating the other surface of the adhesive layer on the other surface of the base layer; includes.

Hereinafter, the manufacturing method of the interior film of the present invention for each step will be described in more detail.

In the step (S1), a scratch-resistant layer may be formed by forming a surface layer on the transparent resin layer.

A surface layer may be formed by coating the composition for forming a surface layer on the transparent resin layer and then curing it. In this case, as the coating method, a gravure coating method may be used, and by curing by UV curing, the surface layer may be formed so that the particles included in the composition for forming the surface layer do not protrude to the surface.

The composition for forming the surface layer may be formed by mixing aluminum oxide particles with a surface treatment agent or additionally mixing organic particles.

In the step (S2), the transparent resin layer may be in contact with one surface of the base layer, and a scratch resistant layer may be laminated on the base layer. In this case, durability may be improved by pressing using a roll press.

In the step (S3), after forming a release layer on one side of the adhesive layer, the other side of the adhesive layer is laminated on the other side of the base layer, or coated for forming an adhesive layer, to prepare an interior film. can In this case, the coating may be performed by applying a comma coating method using an adhesive such as polyester. In addition, by forming the adhesive layer as an opaque layer, it is possible to produce a clearer three-dimensional effect. When the adhesive layer is formed as an opaque layer, a pigment may be added to the adhesive.

In addition, the pressure-sensitive adhesive composition may include at least one selected from the group consisting of a hydroxyl group-containing acrylic pressure-sensitive adhesive, a saturated polyester-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and combinations thereof, and as a curing agent, xylene diisocyanate (XDI), hexamethylene die Isocyanate-based curing agents such as sonate (HDI), methylenediphenyl diisocyanate (MDI), and toluene diisocyanate (TDI) may be included, and the solvent includes methyl ethyl ketone, toluene, ethyl acetate, methyl isobutyl ketone, and the like. can do.

In addition, the method of forming the release layer on one surface of the pressure-sensitive adhesive layer may be formed by coating a release agent or attaching a release film or a release sheet.

The interior film manufactured in this way may be attached to the adherend by the adhesive layer after the release layer is removed. Specifically, the interior film may be applied to the interior or exterior of a building, home appliances, electronic products, and automobile interior/exterior materials. , can be applied as a finishing material for furniture, doors, and advertising materials.

Hereinafter, preferred examples are presented to help the understanding of the present invention, but the following examples are provided for easier understanding of the present invention, and the present invention is not limited thereto.

production example 1: Preparation of a composition for forming a surface layer (1)

A composition for forming a surface layer was prepared by mixing 2 wt% of aluminum oxide particles having a particle diameter of 3 μm with 98 wt% of a surface treatment agent.

The surface treatment agent contains 50% by weight of methyl ethyl ketone, 0.5% by weight of amorphous silica, 22.5% by weight of N,N-dimethylacrylamide, 22.5% by weight of urethane acrylic acid oligomer, and 2.5% by weight of (1-hydroxycyclohexyl)phenylmethanone. It is prepared by mixing.

production example 2: Preparation of a composition for forming a surface layer (2)

A composition for forming a surface layer was prepared in the same manner as in Preparation Example 1, except that acrylic beads having a particle diameter of 2 μm were additionally used. In this case, 1 wt% of the aluminum oxide particles and 1 wt% of the acrylic beads were used.

production example 3: Preparation of a composition for forming a surface layer (2)

A composition for forming a surface layer was prepared in the same manner as in Preparation Example 2, except that acrylic beads coated with silica having a particle diameter of 2 μm were additionally used. In this case, 1 wt% of the aluminum oxide particles and 1 wt% of the silica-coated acrylic beads were used.

Example One

A 0.1 mm thick base film (LG Chem, LS100S (K-value 70)) containing polyvinyl chloride resin (PVC) was prepared as a base layer.

The composition for forming a surface layer obtained in Preparation Example 1 was coated on one surface of a 0.05 mm thick transparent PVC film (LG Chem, LS100S) by micro-gravure coating method and UV cured to form a surface layer having a thickness of 5 μm.

The surface layer was laminated on one surface of the base layer so that the transparent PVC film of the surface layer was in contact with one surface of the base layer.

Example 2

An interior film was prepared in the same manner as in Example 1, except that the surface layer was prepared using the composition for forming a surface layer obtained in Preparation Example 2.

Example 3

An interior film was prepared in the same manner as in Example 1, except that the surface layer was prepared using the composition for forming a surface layer obtained in Preparation Example 3.

Example 4

An interior film was prepared in the same manner as in Example 1, except that aluminum oxide particles having a particle diameter of 5 μm were used.

Example 5

An interior film was prepared in the same manner as in Example 1, except that aluminum oxide particles having a particle diameter of 5 μm and acrylic beads having a particle diameter of 5 μm were used.

comparative example One

An interior film was prepared in the same manner as in Example 1, except that the thickness of the surface layer was 5 μm, and 70% of the aluminum oxide particles were protruded to the surface.

1: interior film
10: base layer
20: scratch resistant layer
21: transparent resin layer, 22: surface layer
30: adhesive layer
40: release layer
50: printed layer
P1: aluminum oxide particles
P2: organic particles

Claims (15)

base layer; and a scratch-resistant layer formed on one surface of the base layer,
The scratch-resistant layer includes a transparent resin layer and a surface layer formed on the transparent resin layer,
The surface layer will include aluminum oxide particles dispersed inside the surface treatment agent, the interior film. According to claim 1,
The surface layer will further include organic particles, the interior film. 3. The method of claim 1 or 2,
The aluminum oxide particles and organic particles included in the surface layer do not protrude to the interface of the surface layer, the interior film. The method of claim 1,
The surface treatment agent is amorphous silica 0.1 to 20% by weight; 20 to 40 wt% of N,N-dimethylacrylamide; 20 to 40 wt% of urethane acrylic acid oligomer; And (1-hydroxycyclohexyl) phenylmethanone 1 to 20% by weight; will contain; interior film. 5. The method of claim 4,
The surface treatment agent further comprises methyl ethyl ketone,
The methyl ethyl ketone is included in an amount of greater than 0 wt% and 53 wt% or less based on the total weight of the surface treatment agent, the interior film. The method of claim 1,
The aluminum oxide particles are contained in an amount of 1 to 5% by weight based on the total weight of the surface layer, the interior film. According to claim 1,
The particle diameter of the aluminum oxide particles is 1㎛ to 12㎛, interior film. 3. The method of claim 2,
The organic particles will include at least one selected from the group consisting of acrylic beads, urethane beads, and silicone beads, interior film. 3. The method of claim 2,
The surface of the organic particles will be coated with silica, the interior film. According to claim 1,
The transparent resin layer will include at least one selected from the group consisting of polyvinyl chloride (PVC), a plasticizer and a stabilizer, the interior film. 10. The method of claim 9,
The thickness of the transparent resin layer is 0.01 to 0.2 mm, the interior film. According to claim 1,
The base layer is polyethyleneterephthalate (PET), polyvinyl chloride (PVC), polypropylene (polypropylene, PP), polyethylene (polyethylene, PE), acrylonitrile-butadiene-styrene (acrylonitrile-butadiene- The interior film comprising at least one selected from the group consisting of styrene, ABS), polycarbonate (PC), and polymethylmethacrylate (PMMA). According to claim 1,
The interior film that further comprises an adhesive layer formed on the other side of the base layer. 14. The method of claim 13,
The adhesive layer will include at least one selected from the group consisting of an acrylic pressure-sensitive adhesive, a vinyl-based pressure-sensitive adhesive, a polyurethane-based pressure-sensitive adhesive, and a polyester-based pressure-sensitive adhesive, interior film. 14. The method of claim 13,
The interior film that further comprises a release layer formed on the lower surface of the adhesive layer.

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