High-hardness interior film with excellent elongation and method of manufacturing same

Abstract

Disclosed are a high-hardness interior film having excellent elongation and a method for manufacturing same. The high-hardness interior film according to the present invention comprises: a substrate layer; and a coating layer formed on one surface of the substrate layer and including a resin and a plurality of hard particles. In the coating layer, at least a part of the plurality of hard particles protrudes from the surface of the resin, and the plurality of hard particles has an average particle diameter of 5-10 ㎛. Through control of the average particle diameter of the plurality of hard particles, the high-hardness interior film can reach a pencil hardness of 5H or higher while also having elongation of 150% or more.

Description

High-hardness interior film with excellent elongation and method for manufacturing the same

[0001] The present invention relates to an interior film, and more particularly, to a high-hardness interior film with excellent elongation.

[0002] In addition, the present invention relates to a method for manufacturing a high-hardness interior film having excellent elongation.

[0003] Interior films are used for the interior or exterior of buildings, home appliances, electronic products, automobile interior / exterior materials, furniture, doors, and advertising materials, and can provide decorative beauty such as various patterns or three-dimensional shapes.

[0004] Meanwhile, when interior films are used in spaces with high foot traffic or vulnerable to scratches, such as the lower part of walls or walls inside elevator / lift cars, there is a problem that scratches and wear can easily occur.

[0005] Korean Patent Publication No. 10-2022-0092703 (published on July 4, 2022; hereinafter, "Patent Document 1") discloses a high-hardness interior film. The high-hardness interior film disclosed in Patent Document 1 includes a surface layer in which aluminum oxide particles are dispersed as hard particles. However, the aluminum oxide particles do not protrude from the surface. However, if the hard particles are not exposed to the surface, it is difficult to sufficiently enhance the hardness of the interior film, and the film also has texture-related disadvantages.

[0006] Accordingly, a method has been proposed to increase hardness by protruding hard particles, such as silica, onto the surface of an interior film. By protruding hard particles onto the surface of an interior film in this manner, hardness can be improved.

[0007] However, high-hardness interior films with hard particles protruding from the surface generally have low elongation. This poses challenges to the formability of high-hardness interior films. Specifically, low elongation can lead to lifting at 90-degree bends during installation. Furthermore, low elongation can lead to construction defects or bursting when the film is pulled during installation.

[0008] Therefore, a high-hardness interior film with excellent elongation is required.

[0009] The problem to be solved by the present invention is to provide a high-hardness interior film having high hardness and excellent elongation.

[0010] In addition, the problem to be solved by the present invention is to provide a method for manufacturing an interior film that can secure both surface hardness and elongation.

[0011] The objectives of the present invention are not limited to those mentioned above. Other objectives and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through the embodiments of the present invention. Furthermore, it will be readily apparent that the objectives and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0012] A high-hardness interior film according to an embodiment of the present invention for solving the above problem comprises: a base layer; and a coating layer formed on one surface of the base layer and containing a resin and a plurality of hard particles, wherein at least some of the plurality of hard particles protrude from the surface of the resin, and the average particle diameter (D50) of the plurality of hard particles is 5 to 10 µm, an elongation is 150% or more, and a pencil hardness is 5H or more.

[0013] Preferably, the plurality of hard particles may include first hard particles having an average particle diameter (D50) of 3 to 6 μm and second hard particles having an average particle diameter (D50) of 8 to 12 μm.

[0014] Preferably, the plurality of hard particles may include the first hard particles and the second hard particles in a weight ratio of 2:8 to 8:2.

[0015] Preferably, the average particle diameter (D50) of the plurality of hard particles may be 7 to 8 μm.

[0016] Preferably, the plurality of hard particles may contain alumina as a main component. For example, the plurality of hard particles may be composed of at least 50 wt% alumina and up to 50 wt% additional hard particles composed of silica, calcium carbonate, chromium oxide, iron oxide, zirconium, titanium, and combinations thereof. As another example, the plurality of hard particles may be composed of 100 wt% alumina.

[0017] Preferably, the plurality of hard particles may be included in an amount of 50 to 120 parts by weight based on 100 parts by weight of the resin. If the content of the plurality of hard particles is less than 50 parts by weight based on 100 parts by weight of the resin, it is difficult to secure a hardness of 5H or higher. Conversely, if the content of the plurality of hard particles exceeds 120 parts by weight based on 100 parts by weight of the resin, it is difficult to secure an elongation of 150% or higher.

[0018] Preferably, the resin of the coating layer may include a thermosetting resin.

[0019] Preferably, the resin of the coating layer may be a resin in which an acrylic resin and a urethane resin are blended.

[0020] Preferably, the substrate layer may be selected from the group consisting of polyethyleneterephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC), and polymethylmethacrylate (PMMA), and combinations thereof.

[0021] Preferably, the interior film may have a pencil hardness of 7H or less.

[0022] A method for manufacturing a high-hardness interior according to an embodiment of the present invention for solving the above problem includes the steps of: applying a coating layer-forming composition comprising a solvent, a resin, and a plurality of hard particles having an average particle diameter (D50) of 5 to 10 μm on a substrate layer; and applying heat to the applied coating layer-forming composition to thermally cure the resin while evaporating the solvent, thereby causing some of the plurality of hard particles to protrude from the surface of the thermally cured resin.

[0023] Preferably, the plurality of hard particles may include first hard particles having an average particle diameter (D50) of 3 to 6 μm and second hard particles having an average particle diameter (D50) of 8 to 12 μm.

[0024] Preferably, the plurality of hard particles may include the first hard particles and the second hard particles in a weight ratio of 2:8 to 8:2.

[0025] Preferably, the average particle diameter (D50) of the plurality of hard particles may be 7 to 8 μm.

[0026] Preferably, the plurality of hard particles may contain alumina as a main component.

[0027] Preferably, the plurality of hard particles may be included in an amount of 50 to 120 parts by weight per 100 parts by weight of the resin.

[0028] Preferably, the resin of the coating layer may be a resin in which an acrylic resin and a urethane resin are blended.

[0029] The above application can be performed by microgravure printing.

[0030] According to the high-hardness interior film and its manufacturing method according to the present invention, high hardness and elongation can be secured through controlling the average particle diameter of hard particles, etc.

[0031] Through this, the interior film according to the present invention can have the advantages of excellent formability along with scratch resistance.

[0032] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0033] Figure 1 schematically illustrates a cross-section of an interior film according to an embodiment of the present invention.

[0034] Figure 2 shows the results of measuring the mechanical properties of interior film specimens manufactured by the methods according to Example 1 and Comparative Example 7.

[0035] <Explanation of symbols>

[0036] 110: Base layer

[0037] 120: Coating layer

[0038] 122: Thermosetting resin

[0039] 124: Hard particles

[0040] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical idea of ​​the present invention. In describing the present invention, if it is determined that a detailed description of known technologies related to the present invention may unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0041] Hereinafter, the phrase "any configuration is placed on (or below)" a component or "on (or below)" a component may mean that any configuration is placed in contact with the upper surface (or lower surface) of said component, and that other configurations may be interposed between said component and any configuration placed on (or below) said component.

[0042] Hereinafter, high-hardness interior films with excellent elongation according to some embodiments of the present invention will be described.

[0043] Figure 1 schematically illustrates a cross-section of an interior film according to an embodiment of the present invention.

[0044] Referring to FIG. 1, the interior film according to the present invention includes a substrate layer (110) and a coating layer (120).

[0045] The substrate layer (110) imparts mechanical properties to the interior film. Specifically, the substrate layer (110) can support the surface layer (120) to maintain the film shape, and can also protect the surface layer (120) to enhance weather resistance and durability.

[0046] The thickness of the substrate layer (110) may be approximately 0.5 to 5 mm. The thickness of the substrate layer (110) is not particularly limited, but if it satisfies the above range, it may be advantageous for maintaining the shape of the interior film and enhancing weather resistance and durability.

[0047] The substrate layer (110) may be selected from the group consisting of polyethyleneterephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), polycarbonate (PC), polymethylmethacrylate (PMMA), and combinations thereof.

[0048] The interior film according to the present invention may further include an adhesive layer (not shown) and a release layer (not shown) on the lower surface of the substrate layer (110). The release layer is a layer that is peeled and removed before applying the interior film to a specific item, and protects the adhesive layer in the product state of the interior film, thereby facilitating the distribution of the interior film, and maintaining and protecting the shape and physical properties of the interior film from its manufacture until construction. The adhesive layer may allow the interior film to adhere to the portion to which the interior film is to be applied.

[0049] A coating layer (120) is formed on one surface of the substrate layer (110).

[0050] The coating layer (120) includes a resin (122) and a plurality of hard particles (124).

[0051] As shown in the example in Fig. 1, the coating layer (120) has at least some of the plurality of hard particles protruding from the surface of the resin (122). The area ratio of the hard particles exposed from the surface of the resin (122) may be about 15 to 30%.

[0052] The coating layer (120) may be located at the outermost edge of the interior film. A printing layer or the like may be additionally included between the coating layer (120) and the substrate layer (110).

[0053] The above coating layer (120) includes hard particles, has a rough surface, and can exhibit excellent hardness. The thickness, size, and protrusion shape of the interior film of Fig. 1 are merely examples, and the interior film of the present invention is not limited thereto.

[0054] The coating layer of the interior film according to the present invention comprises a plurality of hard particles, at least some of which protrude from the surface of the resin, and the average particle diameter (D50) of the plurality of hard particles is 5 to 10 μm. The inventors of the present invention have found, through extensive research, that when a coating layer is formed using hard particles having an average particle diameter of 5 to 10 μm, it can exhibit a high hardness of 5H or higher, more preferably 6H or higher, and a high elongation of 150% or higher. When the average particle diameter of the hard particles exceeds 10 μm, the scratch resistance and pencil hardness are excellent, but there is a problem that the elongation is significantly reduced to less than 100%. However, when the average particle diameter of the hard particles is 10 μm or less, the pencil hardness is slightly reduced, but the elongation can be significantly increased to 150% or higher. However, when the average particle diameter of the hard particles is less than 5 μm, there is a problem that the pencil hardness is excessively reduced compared to the degree of improvement in elongation.

[0055] Preferably, a plurality of hard particles can be formed by using first hard particles having an average particle diameter (D50) of 3 to 6 μm and second hard particles having an average particle diameter (D50) of 8 to 12 μm. As a result of using a mixture of relatively large hard particles and relatively small hard particles, higher hardness and elongation were exhibited compared to the case where hard particles of uniform size were used. This can be seen as the first hard particles and the second hard particles having a complementary effect in terms of hardness and elongation.

[0056] Among the plurality of hard particles, the weight ratio of the first hard particles and the second hard particles is preferably 2:8 to 8:2, and the weight ratio of the second hard particles having a relatively large size is more preferably 3:7 to 5:5, which is slightly higher. In this range, a hardness of 5H or higher and an elongation of 150% or higher can be stably secured. If the weight ratio of the first hard particles is less than 20%, it may be difficult to secure an elongation of 150% or higher. Conversely, if the weight ratio of the second hard particles is less than 20%, it may be difficult to secure a hardness of 5H or higher.

[0057] The shape of the plurality of hard particles (124) may be spherical, plume-shaped, prolate spheroidal, needle-shaped, polyhedral, cylindrical, or amorphous, but is more preferably spherical. For example, by including spherical alumina particles in the coating layer (120), high scratch resistance can be imparted to the interior film. In the present invention, the average particle diameter of the hard particles means the average diameter equivalent to a circle, and the D50 value in the particle size analysis was used as the average particle diameter.

[0058] As described above, the average particle diameter (D50) of the plurality of hard particles in the present invention is 5 to 10 μm. Preferably, the average particle diameter (D50) of the plurality of hard particles may be 7 to 8 μm. In terms of exhibiting uniform physical properties throughout the film, the maximum particle diameter of the plurality of hard particles is preferably 18 μm or less, more preferably 15 μm or less, and the minimum particle diameter is preferably 1 μm or more, more preferably 3 μm or more.

[0059] Meanwhile, when the weight ratio of the first hard particles to the second hard particles is 2:8 to 8:2 as described above, the average particle diameter (D50) of the plurality of hard particles can be easily controlled to 5 to 10 μm. Furthermore, when the weight ratio of the first hard particles to the second hard particles is 3:7 to 5:5, the average particle diameter (D50) of the plurality of hard particles can be easily controlled to 7 to 8 μm.

[0060] The plurality of hard particles may contain alumina as a main component. That is, the plurality of hard particles may contain alumina in an amount of 50% or more of the total weight of the hard particles.

[0061] The plurality of hard particles may be used alone or in combination with other hard particles. For example, the plurality of hard particles may comprise at least 50 wt% alumina and up to 50 wt% additional hard particles comprising silica, calcium carbonate, chromium oxide, iron oxide, zirconium, titanium, or combinations thereof. In another example, the plurality of hard particles may comprise 100 wt% alumina.

[0062] The above alumina hard particles may be alumina itself or may be surface-treated. For example, surface treatment of alumina with a silane group or the like can increase the compatibility or adhesion between the particles and acrylic resin.

[0063] The above-described plurality of hard particles may be included in an amount of 50 to 120 parts by weight, more preferably 60 to 110 parts by weight, and even more preferably 80 to 100 parts by weight, relative to 100 parts by weight of the resin. If the content of the plurality of hard particles is less than 50 parts by weight relative to 100 parts by weight of the resin, it is difficult to secure a hardness of 5H or higher. Conversely, if the content of the plurality of hard particles exceeds 120 parts by weight relative to 100 parts by weight of the resin, not only is it difficult to secure an elongation of 150% or higher, but the haze value may increase excessively, which may cause a problem in that decorations such as colors, prints, or patterns cannot be clearly seen under the surface layer. In addition, a clumping phenomenon may occur between the particles.

[0064] The resin of the coating layer may include a thermosetting resin. Preferably, the resin of the coating layer may be a blend of an acrylic resin and a urethane resin. Acrylic resins are advantageous in demonstrating high hardness, and urethane resins are advantageous in demonstrating high elongation. Therefore, by using a blend of acrylic resin and urethane resin, both high hardness and high elongation can be simultaneously achieved.

[0065] As a result, the interior film according to the present invention can exhibit excellent elongation along with high hardness. Based on the control of the average particle diameter, content, etc. of the hard particles, the interior film according to the present invention can exhibit an elongation of 150% or more, more preferably 170% or more, and even more preferably 190% or more. In addition, the interior film according to the present invention can exhibit 5H or more in a pencil hardness test according to KS M ISO 15184. Pencil hardness can refer to a hardness value obtained through a scratch test using a pencil. Meanwhile, the interior film according to the present invention can exhibit a pencil hardness of 7H or less. When the pencil hardness exceeds 7H, it is difficult to secure an elongation of 150% or more.

[0066] The thickness of the coating layer (120) may be approximately 4 to 12 μm, and is more preferably 7 to 10 μm. When the thickness of the coating layer (120) is in the range of 12 μm or less, at least a portion of the plurality of hard particles can be exposed to the surface of the coating layer without a separate exposure process. In addition, sufficient elongation can be obtained when the thickness of the coating layer (120) is in the range of 4 μm or more.

[0067] The composition for forming the coating layer (120) may include a thermosetting resin such as a thermosetting urethane acrylate resin and one or more solvents. The thermosetting resin may be included in the composition in an amount of about 20 to 40 wt%. The solvent may be any known solvent, such as methyl isobutyl ketone (MIBK), ethyl acetate (EA), methyl ethyl ketone (MEK), isopropyl alcohol (IPA), etc., without limitation. The composition may further include additives such as a dispersant, an antifoaming agent, and a leveling agent in an amount of 5 wt% or less based on 100 wt% of the total composition.

[0068] A method for manufacturing an interior film according to the present invention comprises the steps of applying a composition for forming a coating layer, which composition comprises a solvent, a thermosetting resin, and a plurality of hard particles, onto a substrate layer, and applying heat to the applied composition to thermally cure the thermosetting resin while evaporating the solvent. By causing the solvent to vaporize during thermal curing of the thermosetting resin, some of the plurality of hard particles protrude from the surface of the thermosetting resin.

[0069] At this time, the coating can be performed by micro-gravure printing. Micro-gravure coating has reverse roll rotation and a relatively small roll size (diameter). For this reason, the micro-gravure coating method is a method suitable for use in a precision coating process. However, in the interior film manufacturing method according to the present invention, the coating process is not limited to the micro-gravure printing method, and the coating process can be performed by various known coating methods such as roll coating, comma coating, slot die coating, inkjet printing, gravure printing, and micro-gravure printing.

[0070] Example

[0071] Hereinafter, the structure and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, these are presented as preferred examples of the present invention and should not be construed as limiting the present invention in any way.

[0072] Anything not described here will be omitted as it is technically feasible for those skilled in this field to infer.

[0073] Examples 1-3

[0074] A coating composition was prepared by adding 100 parts by weight of alumina particles based on 100 parts by weight of the resin to a coating solution composed of 30 wt% of a resin blended with acrylic and urethane in a 1:1 weight ratio, 50 wt% of EA (ethyl acetate) and 18 wt% of MEK (methyl ethyl ketone) as solvents, and 2 wt% of BYK's DISPERBYK-110 (dispersant) as an additive. Using a micro gravure printing device (13C-OI-IDV-1600, manufactured by PNT), the prepared coating composition was applied onto a PVC film and heat-cured at 90°C for 1 hour to form a final coating layer having a thickness of 5.0 μm, thereby preparing an interior film specimen.

[0075] The alumina particles were prepared by mixing first alumina having an average particle diameter (D50) of 5.60 ㎛ and second alumina having an average particle diameter (D50) of 9.34 ㎛ in a weight ratio of 3:7 (Example 1), 4:6 (Example 2), and 5:5 (Example 3).

[0076] Example 4

[0077] An interior film specimen was manufactured in the same manner as in Example 1, except that only the first alumina having an average particle diameter (D50) of approximately 5.6 ㎛ was used as the alumina particles.

[0078] Example 5

[0079] An interior film specimen was manufactured in the same manner as in Example 1, except that only second alumina having an average particle diameter (D50) of approximately 9.34 ㎛ was used as the alumina particles.

[0080] Comparative Example 1

[0081] An interior film specimen was manufactured in the same manner as in Example 1, except that only the first alumina having an average particle diameter (D50) of approximately 2.0 ㎛ was used as the alumina particles.

[0082] Comparative Example 2

[0083] An interior film specimen was manufactured in the same manner as in Example 1, except that the content of alumina particles was 20 parts by weight based on 100 parts by weight of resin.

[0084] Comparative Example 3

[0085] An interior film specimen was manufactured in the same manner as Example 1, except that only second alumina having an average particle diameter (D50) of approximately 40.0 ㎛ was used as alumina particles, and the content of the alumina particles was 20 parts by weight based on 100 parts by weight of the resin.

[0086] Comparative Example 4

[0087] An interior film specimen was manufactured in the same manner as Example 1, except that only second alumina having an average particle diameter (D50) of approximately 40.0 ㎛ was used as alumina particles, and the content of the alumina particles was 200 parts by weight based on 100 parts by weight of the resin.

[0088] Comparative Example 5

[0089] An interior film specimen was manufactured in the same manner as Example 1, except that only first alumina having an average particle diameter (D50) of approximately 2.0 ㎛ was used as alumina particles, and the content of the alumina particles was 200 parts by weight based on 100 parts by weight of the resin.

[0090] Comparative Example 6

[0091] An interior film specimen was manufactured in the same manner as Example 1, except that only first alumina having an average particle diameter (D50) of approximately 2.0 ㎛ was used as alumina particles, and the content of the alumina particles was 20 parts by weight based on 100 parts by weight of the resin.

[0092] Comparative Example 7

[0093] An interior film specimen was manufactured in the same manner as in Example 1, except that only second alumina having an average particle diameter (D50) of approximately 40.0 ㎛ was used as the alumina particles.

[0094] Comparative Example 8

[0095] An interior film specimen was manufactured in the same manner as in Example 1, except that only second alumina having an average particle diameter (D50) of approximately 15.0 ㎛ was used as the alumina particles.

[0096] Mechanical properties evaluation

[0097] In addition, the results of measuring the mechanical properties of the interior film specimens according to Examples 1 and 4 and Comparative Example 7 are shown in Table 1 and Fig. 2.

[0098] The method for measuring mechanical properties is as follows.

[0099] 1) Tensile strength and elongation were measured according to ASTM D638. Specifically, tensile strength and elongation were measured under the conditions of a specimen length of 120 mm, measurement temperature of room temperature, and test speed of 200±2 mm / min.

[0100] The yield was calculated according to the following formula.

[0101] Elongation (%) = ((BA) / A)×100

[0102] A: Distance from the center of the specimen to the mark before the tensile test (mm)

[0103] B: Distance from the center of the specimen to the mark at the time of specimen fracture (mm)

[0104] 2) Pencil hardness was measured according to KS M ISO 15184. Specifically, pencil hardness was measured under the conditions of a 45-degree angle with the specimen and a pressure load of 200 gf.

[0105] [Table 1]

[0106]

[0107] Referring to Table 1 and Figure 2, it can be seen that the interior specimen according to Example 1 has a slightly lower tensile strength than the interior specimen according to Comparative Example 1, but a significantly higher elongation.

[0108] Additionally, the results of measuring the mechanical properties of the interior film specimens according to Examples 2 to 3 and Comparative Examples 1 to 6 are shown in Table 2.

[0109] [Table 2]

[0110]

[0111] Referring to Table 2, the specimens according to Examples 1 to 5, which satisfy the average particle diameter of the hard particles presented in the present invention of 5 to 10 ㎛ and the content of 50 to 120 parts by weight relative to the resin, all exhibited a pencil hardness of 5H or higher and a high elongation of 150% or higher.

[0112] Meanwhile, in the case of Comparative Example 1, where the average particle size of the hard particles was too small, it was difficult to secure a pencil hardness of 5H or higher, and in the case of Comparative Example 2, where the content of the hard particles was too low, it was difficult to secure a pencil hardness of 5H or higher. In the case of Comparative Examples 3, 4, and 7, where the size of the hard particles was too large, the elongation was poor regardless of the content. In the case of Comparative Examples 4 and 5, where the content of the hard particles was too high, the elongation was poor regardless of the average particle size. In the case of Comparative Example 6, where the average particle size of the hard particles was too small and the content was too low, the pencil hardness was too low because the hard particle content was too low. In addition, in the case of Comparative Example 8, where the average particle size of the hard particles slightly exceeded 10㎛, the pencil hardness was good, but the elongation was significantly lower than that of Example 1.

[0113] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. Base layer; and A coating layer formed on one surface of the above substrate layer and including a resin and a plurality of hard particles, The coating layer has at least some of the plurality of hard particles protruding from the surface of the resin, The average particle diameter of the above plurality of hard particles is 5 to 10 μm, Interior film with an elongation of 150% or more and a pencil hardness of 5H or more.

2. In paragraph 1, An interior film, wherein the plurality of hard particles include first hard particles having an average particle diameter of 3 to 6 μm and second hard particles having an average particle diameter of 8 to 12 μm.

3. In paragraph 2, An interior film wherein the plurality of hard particles include the first hard particles and the second hard particles in a weight ratio of 2:8 to 8:

2.

4. In paragraph 2, An interior film wherein the average particle diameter (D50) of the above plurality of hard particles is 7 to 8 μm.

5. In paragraph 1, An interior film wherein the plurality of hard particles contain alumina in an amount of 50% by weight or more of the total weight of the hard particles.

6. In paragraph 1, An interior film, wherein the above-mentioned plurality of hard particles are included in an amount of 50 to 120 parts by weight per 100 parts by weight of the above-mentioned resin.

7. In paragraph 1, An interior film in which the resin of the above coating layer includes a thermosetting resin.

8. In paragraph 1, An interior film in which the resin of the above coating layer is a blend of acrylic resin and urethane resin.

9. In paragraph 1, The above interior film is an interior film having a pencil hardness of 7H or less.

10. A step of applying a composition for forming a coating layer including a solvent, a resin, and a plurality of hard particles having an average particle diameter of 5 to 10 ㎛ on a substrate layer; and A method for manufacturing an interior film, comprising: a step of applying heat to the composition for forming the applied coating layer, thermally curing the resin while evaporating the solvent, thereby causing some of the plurality of hard particles to protrude from the surface of the thermally cured resin.

11. In paragraph 10, A method for manufacturing an interior film, wherein the plurality of hard particles include first hard particles having an average particle diameter of 3 to 6 μm and second hard particles having an average particle diameter of 8 to 12 μm.

12. In paragraph 11, A method for manufacturing an interior film, wherein the plurality of hard particles include the first hard particles and the second hard particles in a weight ratio of 2:8 to 8:

2.

13. In paragraph 11, A method for manufacturing an interior film, wherein the average particle diameter (D50) of the above plurality of hard particles is 7 to 8 μm.

14. In paragraph 10, A method for manufacturing an interior film, wherein the plurality of hard particles contain alumina in an amount of 50% by weight or more of the total weight of the hard particles.

15. In paragraph 10, The above multiple hard particles A method for manufacturing an interior film, comprising 50 to 120 parts by weight per 100 parts by weight of the above resin.

16. In paragraph 10, A method for manufacturing an interior film, wherein the resin of the above coating layer is a blended resin of an acrylic resin and a urethane resin.

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