Process film and method for producing matte film using the process film

Abstract

To provide a process film which, when a matte film is produced using the process film, can suppress unevenness in the matte film caused by uneven matte or moire in the matte film, thereby improving the appearance of the matte film, and a method for producing the matte film using the process film. [Solution] The substrate (11) has a matte coating layer (12) laminated on the substrate (11), the matte coating layer (12) contains a resin and a matting agent, and the surface roughness (Spk) of the surface (12a) of the matte coating layer (12) opposite the substrate (11) is 1.5 μm or more when measured at a magnification of 50 times in accordance with ISO25178.

Description

[Technical Field]

[0001] The present invention relates to a process film having a matte coating layer with an uneven surface, for producing a matte film with the unevenness transferred by forming a film on the matte coating layer, and a method for producing a matte film using the process film. [Background technology]

[0002] Conventionally, when producing a matte film with a matte surface, it has been disclosed that a process film having a matte coating layer with an uneven surface is used, and a matte film material is applied to the uneven surface of this process film and cured, thereby producing a matte film with an uneven surface and a matte finish (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7245687 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when producing a matte coat layer for a process film, if a large amount of resin that will form the matte coat layer is applied at once, unevenness of concaves and convexes (hereinafter referred to as matte unevenness) may occur in the formed matte coat layer. On the other hand, if a small amount of resin that will form the matte coat layer is applied in multiple layers, the oblique line shape of the printing plate used for application may interfere, causing a moire pattern like a stripe (also called moire; hereinafter referred to as "moire"). Furthermore, when a matte film is produced using a process film that has matte unevenness or moire, the unevenness of the process film is transferred to the matte film, and the produced matte film has specific unevenness of concaves and convexes caused by the matte unevenness or moire of the process film, which may impair the appearance of the matte film and reduce the quality of the matte film.

[0005] The present invention aims to provide a process film that, when a matte film is manufactured using the process film, can suppress unevenness in the matte film caused by uneven matting and moire in the matte film, thereby improving the appearance of the matte film, and a method for manufacturing a matte film using the process film. [Means for solving the problem]

[0006] A cast film according to a first aspect of the present invention comprises a substrate and a matte coating layer laminated on the substrate, the matte coating layer containing a resin and a matting agent, and the surface of the matte coating layer opposite the substrate has a surface roughness (Spk) of 1.5 μm or more when measured at a magnification of 50 times in accordance with ISO 25178. The casting film further comprises a release layer laminated on the matte coating layer, and the thickness of the release layer is 0.5 g / m2 in terms of solid content. 2 The following configuration can be adopted. In the casting film, the matte coating layer may contain a release component and function as a release layer. A second aspect of the present invention provides a casting film having a substrate, a matte coating layer laminated on the substrate, and a release layer laminated on the matte coating layer, wherein the matte coating layer contains a resin and a matting agent, and the surface roughness Spk of the release layer opposite the matte coating layer is 1.5 μm or more when measured at a magnification of 50 times in accordance with ISO 25178. In the casting film, the matting agent may have a primary particle size of 1 to 10 μm. In the casting film, the matte coating layer may contain the matting agent in an amount of 5 to 50% by weight of the entire matte coating layer. The method for manufacturing a matte film according to the present invention uses a process film having a substrate, a matte coating layer laminated on the substrate, and a release layer laminated on the matte coating layer, and produces a matte film by applying a resin raw material onto the release layer and curing it, wherein the matte coating layer or the release layer has a surface roughness Spk of 1.5 μm or more on the surface opposite the substrate when measured at a magnification of 50 times in accordance with ISO25178. [Effects of the Invention]

[0007] According to the present invention, when a matte film is produced, the occurrence of matte unevenness and moire in the matte film can be suppressed, and the appearance of the matte film can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram illustrating the configuration of a process film according to the present embodiment. [Figure 2] 3A to 3C are diagrams illustrating a method for manufacturing a process film according to the present embodiment. [Figure 3] 1 is a table showing the results of verifying the relationship between surface roughness and appearance in the casting film according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The casting film of the present invention will be described with reference to the drawings. The casting film of the present invention has a textured surface, and by forming a film on the casting film, a matte film with a matte finish to which the textured surface is transferred can be produced. Matte films produced in this way include resin sheets and adhesive sheets.

[0010] Fig. 1 is a structural diagram of a casting film 1 according to this embodiment. As shown in Fig. 1, the casting film 1 according to this embodiment has a structure in which a substrate 11, a matte coating layer 12, and a release layer 13 are laminated in this order. Each layer will be described below.

[0011] (base material) The substrate 11 is made of a material such as PET (polyethylene terephthalate), polyimide, PEN (polyethylene naphthalate), polyester, polypropylene, polyethylene, etc. The thickness of the substrate 11 is not particularly limited and can be, for example, 10 to 300 μm, and more preferably 25 to 100 μm.

[0012] (Matte coat layer) The matte coat layer 12 is a layer laminated on the substrate 11 and has an uneven surface. The matte coat layer 12 is mainly made of a resin material, such as an acrylic resin, a melamine resin, a vinyl resin, or a polyurethane resin, which can be used alone or in a polymer blend. In this embodiment, an acrylic resin is used as the main component of the matte coat layer 12.

[0013] The matte coat layer 12 has an uneven surface 12a (also referred to as the surface 12a) opposite the substrate 11. The matte coat layer 12 contains a matting agent to form the uneven surface 12a. The matting agent is solid particles and may be inorganic, such as silica, or organic, such as acrylic beads. The matting agent may contain two or more types of particles, or may contain a mixture of inorganic and organic particles. In particular, the use of matting agents with different particle sizes can increase the spk value compared to using only matting agents with the same particle size. The matting agent may have a primary particle size in the range of 10 nm to 50 μm, more preferably in the range of 1 to 10 μm. In this embodiment, the matting agent is a mixture of silica with a primary particle size of 3 to 4 μm and acrylic beads with a primary particle size of 6 μm. The content of the matting agent is not particularly limited and may be 5 to 50 wt %, more preferably 10 to 35 wt %, of the total matte coat layer 12.

[0014] Furthermore, the matte coat layer 12 may contain a curing agent (or a cross-linking agent). For example, isocyanate may be used as the curing agent (or the cross-linking agent). Furthermore, the matte coat layer 12 may contain a wax component, an antioxidant, etc.

[0015] The matte coat layer 12 is formed by applying a coating material that will form the matte coat layer 12 onto the substrate 11, drying it, and then curing it. The method for applying the coating material is not particularly limited, and it can be applied by gravure printing or offset printing, or by using a comma coater or bar coater. The matte coat layer 12 can also be formed by heating and drying the applied coating material, for example, at 40 to 120 degrees, and then leaving it to harden (cure) for 8 to 168 hours, for example, at room temperature to 80 degrees.

[0016] The matte coating layer 12 can also be formed to a predetermined thickness by applying the coating material multiple times. When applying the coating material multiple times, the first application is dried, as in the case of general multi-layer (multi-color) gravure printing, and then the application and drying of the coating material are repeated in the same manner, thereby forming a matte coating layer 12 having a thickness of two or more layers.

[0017] (Surface roughness of matte coating layer 12) In this embodiment, by manufacturing the matte coating layer 12 as described above, the Sa value (magnification: 50x) indicating the surface roughness of the matte coating layer 12 can be set to a range of 0.1 to 2.0 μm, and the Spk value (magnification: 50x) can be set to 1.5 μm or more. In particular, in the cast film 1 according to this embodiment, by setting the Spk value on the surface of the matte coating layer 12 to 1.5 μm or more when measured at 50x magnification in accordance with ISO 25178, a matte coating layer with good surface appearance can be obtained over a relatively wide area of ​​the matte coating layer 12. Here, the Spk value is an index indicating the height of protrusions in the surface roughness of the matte coating layer 12. Generally, the lower the Spk value, the smoother the surface. Therefore, the inventors initially expected that the lower the Spk value, the more likely it would be to suppress the occurrence of matte unevenness and moire. However, as described below, we investigated the relationship between surface roughness (including Sa and Spk values) and appearance due to the occurrence of matte unevenness and moiré. We found that a large Sa increases the likelihood of matte unevenness and moiré occurring during the manufacturing and design process, while a high Spk value of 1.5 μm or greater reduces the occurrence of matte unevenness and moiré. The casting film 1 of the present invention was created based on this knowledge, and as described above, is characterized in that the Spk value of the surface 12a of the matte coating layer 12 is 1.5 μm or greater when measured at a magnification of 50 times in accordance with ISO 25178. The upper limit of the Spk value is not particularly limited, but is preferably 5 μm or less, and more preferably 4 μm or less.

[0018] (Release layer 13) The release layer 13 is a layer laminated on the matte coat layer 12. In this embodiment, the release layer 13 contains a resin as a main component. Examples of resins used for the release layer 13 include thermosetting silicone resins and UV-curable silicones. The release layer 13 may also contain a catalyst that promotes the curing of the resin. Platinum and antimony may be used as such a catalyst. The release layer 13 is formed on the matte coat layer 12, which has an uneven surface 12a, and therefore the surface 13a of the release layer 13 opposite the matte coat layer 12 (hereinafter also referred to as the surface 13a) also has unevenness.

[0019] In this embodiment, the release layer 13 is formed by laminating a coating material for forming the release layer 13 on the matte coat layer 12. Specifically, the coating material for forming the release layer 13 is applied by, for example, gravure coating, and is left to stand at room temperature to 80°C for 1 to 7 days for curing, thereby hardening the coating material and forming the release layer 13. The thickness of the release layer 13 is not particularly limited, but is preferably 0.01 g / m2 in terms of solid content. 2 or more, preferably 0.05 g / m 2 More preferably, 0.08 g / m 2 The thickness of the release layer 13 is 2.0 g / m or more. 2 or less, more preferably 1.0 g / m 2 , and more preferably 0.5 g / m 2 Below 0.3 g / m, particularly preferably 2 It can be formed as follows:

[0020] (Surface roughness of release layer 13) By forming the release layer 13 as described above, the casting film 1 according to this embodiment can improve the appearance of the matte film 2 produced using the casting film 1, even when the release layer 13 is formed. In particular, in this embodiment, the release layer 13 is formed at a density of 0.5 g / m 2 Less than or equal to 0.3 g / m 2By forming the release layer 13 so as to satisfy the following conditions, the Spk value (magnification: 50x) of the surface 13a of the release layer 13 can be set to 1.5 μm or more, or 1.6 μm or more. By setting the Spk value of the surface 13a of the release layer 13 to 1.5 μm or 1.6 μm or more under measurement conditions of 50x magnification in accordance with ISO 25178, uneven matte patterns and unevenness in the unevenness of the process film 1 due to moire patterns can be suppressed, and a matte film 2 with excellent appearance can be obtained.

[0021] (Matte film manufacturing method using process film) Next, a method for manufacturing a matte film 2 using the processing film 1 according to this embodiment will be described. FIG. 2 is a diagram illustrating a method for manufacturing a matte film 2 using the processing film 1 according to this embodiment. First, as shown in FIG. 2(A), a processing film 1 is prepared. The processing film 1 is generally in the form of a rolled film when used, and is pulled out from the roll. Next, as shown in FIG. 2(B), a material for the matte film 2 is applied to the surface 13a of the release layer 13. After heating and drying for a certain period of time, the material for the matte film 2 is cured, thereby forming the matte film 2 on the release layer 13. The thickness of the matte film 2 is not particularly limited. For example, the material for the matte film 2 can be applied using a gravure printing plate or the like to a thickness of 1 to 5,000 μm, preferably 10 to 300 μm. Then, as shown in FIG. 2(C), the matte film 2 is peeled off from the processing film 1 to produce the matte film 2. The raw material of the matte film 2 is not particularly limited, but for example, epoxy resin, acrylic resin, urethane resin, vinyl acetate resin, silicone resin, rubber resin, or the like can be used as the main component.

[0022] In this embodiment, by setting the surface 12a of the matte coating layer 12 to an Spk value of 1.5 μm or more under measurement conditions of 50x magnification in accordance with ISO 25178, the surface 13a of the thin release layer 13 also has corresponding unevenness. As a result, the matte film 2 formed on the surface 13a of the release layer 13 has an uneven configuration in which the unevenness of the surface 13a of the release layer 13 is transferred. This allows the matte film 2 to have a matte appearance by diffusely reflecting light on the surface. Furthermore, as the Sa of the matte film 2 increases, unevenness and moiré tend to occur. However, even when the Sa of the matte film 2 is large, by forming the matte film 2 on the thin release layer 13 on the surface 12a having an Spk value of 1.5 μm or more, unevenness of the matte film 2 due to the unevenness of the process film 1 and moiré is suppressed, resulting in excellent appearance.

[0023] (Example) Next, examples of the casting film 1 according to this embodiment will be described. In these examples, casting films for Test Examples 1 to 6 and Comparative Examples 1 to 3 were produced to verify the relationship between the surface roughness and appearance of the casting film. In Test Examples 1 to 6, the composition of each layer of the casting film (components and their blending ratios) was the same. The surface roughness of the casting films was measured, and the appearance of the casting films was evaluated. If the appearance of the casting film is evaluated and the occurrence of matte unevenness and moire is suppressed, the unevenness will be transferred as is to a matte film produced using the casting film, and it can be determined that the occurrence of matte unevenness and moire is suppressed. This example will be described below with reference to FIG. 3. FIG. 3 shows the results of verifying the relationship between the surface roughness and appearance of the casting film in this example.

[0024] Test Examples 1 to 4 and Test Examples 7 and 8 are examples of process films 1 prepared by manually applying the coating material that constitutes the matte coating layer 12 using a bar coater. Specifically, in Test Examples 1 and 3, a wet amount of 8 g / m was applied using a bar coater. 2In Test Examples 2 and 4, the coating material was applied at a wet amount of 13.8 g / m using a bar coater to form a matte coating layer 12. 2 In Test Examples 7 and 8, a coating material was applied to form a matte coating layer 12, and in Test Examples 7 and 8, a wet amount of 11 g / m was applied using a bar coater. 2 The coating material was applied to form the matte coating layer 12. Test Examples 1, 2, 7, and 8 are examples of cast films 1 in which the coating material that constitutes the matte coating layer 12 was applied only once to form the matte coating layer 12, while Test Examples 3 and 4 are examples of cast films 1 in which the coating material that constitutes the matte coating layer 12 was applied twice to form the matte coating layer 12. Test Example 5 is an example of cast film 1 in which the coating material that constitutes the matte coating layer 12 was applied twice using a gravure plate with a cell capacity of 17 cc to form the matte coating layer 12. Test Example 6 is an example of cast film 1 in which the coating material that constitutes the matte coating layer 12 was applied twice using a gravure plate with a cell capacity of 5.5 cc to form the matte coating layer 12.

[0025] Furthermore, in this example, comparative examples were prepared for the casting films of Comparative Examples 1 to 8. Specifically, Comparative Examples 1 to 4 are examples of casting films 1 in which the matte coating layer 12 was formed by applying the coating material constituting the matte coating layer 12 in two separate applications using a gravure plate with a cell capacity of 8 cc. Furthermore, in Comparative Examples 1 to 4, the content of the matting agent in the matte coating layer 12 was varied. Specifically, 0 to 15 parts by weight of matting agent and 8 parts by weight of curing agent were added to a resin base containing the matting agent (XGS5011 Matte Medium NT manufactured by Sakata Inx Corporation, containing 16.7% matting agent). More specifically, in Comparative Example 1, 15 parts by weight of matting agent was added per 100 parts by weight of the resin base; in Comparative Example 2, 10 parts by weight of matting agent was added per 100 parts by weight of the resin base; in Comparative Example 3, 5 parts by weight of matting agent was added per 100 parts by weight of the resin base; and in Comparative Example 4, 0 parts by weight of matting agent was added per 100 parts by weight of the resin base. In Comparative Examples 5, 7, and 8, a bar coater was used to coat the coated paper with a wet amount of 7.5 g / m 2In Test Example 6, the coating material was applied once to form a matte coating layer 12 using a bar coater. 2 The coating material was applied once to form a matte coating layer 12. Furthermore, in this example, two types of matting agents were used: a matting agent with a normal diameter and a matting agent with a large diameter. In Examples 1-6 and Comparative Examples 1-4, only a matting agent with a normal diameter was used, in Comparative Examples 5 and 6, only a matting agent with a large diameter was used, in Comparative Example 7 and Example 7, some of the matting agents with a normal diameter were replaced with a matting agent with a large diameter, and in Comparative Example 8 and Example 8, the proportion of the matting agent with a large diameter was increased compared to Comparative Example 7 and Example 7. The spk value can be adjusted by using matting agents with different particle sizes.

[0026] In this example, first, the process films of Test Examples 1 to 8 and Comparative Examples 1 to 8 were prepared, and the surface roughness of the prepared process films was measured. Specifically, using a contact-type measuring device (manufactured by Mitutoyo Corporation, product name "SJ-400"), the MD (machine direction) Ra and Rz and the TD (transverse direction) Ra and Rz were measured for the process films of Test Examples 1 to 6 and Comparative Examples 1 to 4 according to a method in accordance with JIS B 0601, as shown in FIG. 3. Furthermore, using a non-contact measuring device (manufactured by Keyence Corporation, product name "VK-X1000"), the Sa, Svk, and Spk were also measured for the process films of Test Examples 1 to 8 and Comparative Examples 1 to 8 according to a method in accordance with ISO 25178. Note that Sa, Svk, and Spk were measured at 50x magnification.

[0027] Furthermore, in this example, five panelists who are experts on the processing film according to this embodiment visually evaluated the occurrence of matte unevenness and moire for the processing films of Test Examples 1 to 8 and Comparative Examples 1 to 8. Specifically, the appearance of the processing film was rated on a four-point scale, with "1" indicating no matte unevenness or moire, "2" indicating almost no matte unevenness or moire, "3" indicating some matte unevenness or moire, and "4" indicating significant matte unevenness or moire. The average of the evaluation results of the five panelists was then calculated.

[0028] In addition, in this example, in the casting films of Test Examples 1, 4, and 6 and Comparative Examples 2 to 4, the release layer 13 was formed on the surface 12a of the matte coating layer 12 at a solid content of 0.1 g / m 2 or 0.4g / m2 solid content 2 The surface roughness spk of the surface 13a of the release layer 13 at each thickness was measured and the appearance was evaluated. The method for measuring the surface roughness spk and the method for evaluating the appearance were the same as when there was no release layer 13.

[0029] 3, without the release layer 13, the processing films 1 of Test Examples 1 to 8 were rated as "1" or "2" for appearance, indicating that the occurrence of matte unevenness and moiré was suppressed. This suggests that the occurrence of matte unevenness and moiré can also be suppressed in the matte films 2 to which texture was imparted by transfer using the processing films 1 of Test Examples 1 to 8. On the other hand, the processing films of Comparative Examples 1 to 8 were rated as "3" or "4" for appearance, indicating that matte unevenness and moiré occurred. This suggests that the matte films to which texture was imparted by transfer using the processing films of Comparative Examples 1 to 8 also exhibit specific unevenness due to matte unevenness and moiré.

[0030] 3, when the casting films 1 of Test Examples 1 to 8 were compared with the casting films of Comparative Examples 1 to 8 without the release layer 13, it was found that the casting films 1 of Test Examples 1 to 8 tended to have a higher Spk value, which is the surface roughness of the matte coating layer 12. Specifically, the casting films 1 of Test Examples 1 to 8 had a surface roughness Spk value of the surface 12a of the matte coating layer 12 opposite the substrate 11, measured at a magnification of 50 times in accordance with ISO 25178, of 1.5 μm or more, whereas the casting films of Comparative Examples 1 to 8 had Spk values ​​less than 1.5 μm.

[0031] 3, it was found that when the release layer 13 is not present, the occurrence of matte unevenness and moire tends to be suppressed when the index indicating the Spk value, among the indices indicating the surface roughness of the matte coating layer 12, is large. Specifically, it was found that the occurrence of matte unevenness and moire is suppressed when the Spk value of the surface 12a of the matte coating layer 12 is 1.5 μm or more under measurement conditions at a magnification of 50 times in accordance with ISO 25178. Furthermore, it was found that in Examples 2 to 4, where the Spk value was within the range of 1.75 to 2.0 μm, the occurrence of matte unevenness and moire was further suppressed and the appearance was more excellent.

[0032] In addition, a release layer 13 was formed on the surface 12a of the matte coating layer 12 with a solid content of 0.1 g / m 2 3, the results of the casting films 1 of Test Examples 1, 4, and 6 and the casting films of Comparative Examples 2 to 4 show that, as in the case where no release layer 13 is formed, the occurrence of matte unevenness and moire can be suppressed when the index indicating the Spk value is large, more specifically, when the Spk value of the surface 13a of the release layer 13 is 1.5 μm or more under measurement conditions of 50x magnification in accordance with ISO 25178. Furthermore, when the release layer 13 is formed on the surface 12a of the matte coating layer 12 with a solid content of 0.4 g / m 2 As with the case where the release layer 13 is not formed, it was found that even when the release layer 13 is formed to a thickness of 1.5 μm or more, the occurrence of matte unevenness and moire tends to be suppressed when the index indicating the Spk value is large, more specifically, when the Spk value of the surface 13a of the release layer 13 is 1.5 μm or more under measurement conditions of 50x magnification in accordance with ISO25178.

[0033] As described above, the processing film 1 according to this embodiment includes a substrate 11 and a matte coating layer 12 laminated on the substrate 11. The matte coating layer 12 contains a resin and a matting agent. The surface roughness Spk of the surface 12a opposite the substrate 11 is 1.5 μm or greater when measured at a magnification of 50 times in accordance with ISO 25178. The processing film 1 according to this embodiment also includes a release layer 13 laminated on the matte coating layer 12. The surface roughness Spk of the surface of the release layer 13 opposite the matte coating layer 12 is 1.5 μm or greater when measured at a magnification of 50 times in accordance with ISO 25178. This processing film 1, as shown in the example in FIG. 3, can suppress the occurrence of matte unevenness and moire patterns in the processing film 1. As a result, the occurrence of specific unevenness due to matte unevenness and moire patterns in the processing film 1 can be suppressed in the matte coating layer 2 produced using the processing film 1. In particular, in the process film 1 according to the first embodiment, the matte coating layer 12 contains a matting agent having a primary particle diameter of 1 to 10 μm, and a first matting agent which is organic is mixed with a second matting agent which is inorganic, with the first matting agent having a larger primary particle diameter than the second matting agent. Furthermore, by containing the first matting agent at 5 to 50% by weight of the entire matte coating layer, the occurrence of matte unevenness and moire in the matte film 2 produced using the process film 1 can be more effectively suppressed.

[0034] Although the preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above-described embodiments. Various modifications and improvements can be made to the above-described embodiments, and such modifications and improvements are also included in the technical scope of the present invention.

[0035] For example, in the above-described embodiment, the process film 1 is described as a laminate having three layers: a substrate 11, a matte coating layer 12, and a release layer 13. However, the present invention is not limited to this configuration and may also be configured as a laminate having two layers: a substrate 11 and a matte coating layer 12. In this case, it is preferable that the matte coating layer 12 contains a release component and functions as a release layer. The release component is selected based on its incompatibility with the matte film 2. For example, if the matte film 2 is an epoxy resin or urethane resin, modified melamine resin beads or the like can be used as the release component. If the matte film 2 is a resin other than silicone, silicone beads or the like can be used as the matting agent.

[0036] Furthermore, in the above-described embodiment, a configuration in which the matte coat layer 12 is laminated on the substrate 11 has been exemplified. However, to improve adhesion between the substrate 11 and the matte coat layer 12, the portion of the matte coat layer 12 that contacts the substrate 11 can be made of only the main agent of the matte coat layer 12 (a resin that does not contain a matting agent). That is, in this case, the matte coat layer 12 can be made by applying a coating material multiple times, with the first application being an application of only the main agent (a resin that does not contain a matting agent), and the second and subsequent applications being application of a resin that contains a matting agent. By using a main agent that does not contain a matting agent (or a coating material with a small amount of matting agent) as the first coating material that contacts the substrate 11, adhesion between the substrate 11 and the coating material can be improved compared to when a coating material that normally contains a matting agent is applied first, and as a result, adhesion between the substrate 11 and the matte coat layer 12 can be improved. [Explanation of symbols]

[0037] 1...Process film 11...Base material 12...Matte coat layer 12a…Surface (surface) 13...Release layer 13a…Surface (surface) 2...Matte film

Claims

1. A substrate and a matte coating layer laminated on the substrate, the matte coating layer contains a resin and a matting agent, A casting film, wherein the surface of the matte coating layer opposite to the substrate has a surface roughness Spk of 1.5 μm or more when measured at a magnification of 50 times in accordance with ISO 25178.

2. Further, a release layer is laminated on the matte coating layer, The thickness of the release layer is 0.5 g / m in terms of solid content. ２ 2. The process film of claim 1, wherein:

3. The casting film according to claim 1 , wherein the matte coating layer contains a release component and also functions as a release layer.

4. A substrate, a matte coating layer laminated on the substrate, and a release layer laminated on the matte coating layer, the matte coating layer contains a resin and a matting agent, A casting film, wherein the surface of the release layer opposite to the matte coating layer has a surface roughness Spk of 1.5 μm or more when measured at a magnification of 50 times in accordance with ISO 25178.

5. 5. The casting film according to claim 1, wherein the matting agent has a primary particle size of 1 to 10 μm.

6. 5. The casting film according to claim 1, wherein the matte coating layer contains the matting agent in an amount of 5 to 50% by weight of the entire matte coating layer.

7. A method for producing a matte film using a process film having a substrate, a matte coating layer laminated on the substrate, and a release layer laminated on the matte coating layer, by applying a resin raw material onto the release layer and curing the resin raw material, The method for producing a matte film, wherein the matte coating layer or the release layer has a surface roughness Spk of 1.5 μm or more on the surface opposite to the substrate, as measured at a magnification of 50 times in accordance with ISO 25178.

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