Plastering materials, coating methods, and coated products

Abstract

To provide a novel plastering material that can be used in the same way as conventional plastering materials and yields a coated article with a smooth surface, dense shading patterns, and novel design quality, making it suitable for interior and exterior walls, floors, ceilings, and other construction parts, as well as furniture, tables, desks, chairs, and other interior products.SOLUTION: A coated article is obtained by applying a plasterer material mainly composed of a synthetic resin emulsion containing a specific amount of short fibers having a specific fiber length to a substrate using a trowel and then applying a plasterer material mainly composed of a synthetic resin emulsion containing a specific amount of short fibers.

Description

Technical Field

[0001] The present invention relates to plaster materials, a coating method using the plaster materials, and a coated object obtained by the coating method. Specifically, it relates to a plaster material containing a specific amount of short fibers of a specific length in a plaster material mainly composed of a synthetic resin emulsion, a coating method of providing a topcoat layer after applying the plaster material with a trowel, and a coated object having a smooth surface and a shading pattern obtained by the coating method.

Background Art

[0002] Conventionally, plaster materials have been widely used in the fields of architecture and civil engineering, and many devices and inventions have been made to improve workability, durability, water resistance, and designability. For example, for the purpose of good dispersibility in the plaster material and preventing cracks after plaster construction, a reinforcing fiber for plaster materials made of polyamide fibers having a specific fineness, fiber length, elongation, and strength, a plaster material, and a plaster construction method have been proposed (see Patent Document 1).

[0003] As a coating method using a plaster material, a method of applying multiple layers of coating to create a specific pattern or decorative surface is known. For example, a step of forming a base layer by adjusting an aggregate-containing base material and applying it to the substrate so as to have unevenness, and a step of applying a semi-fluid paint one or more layers while troweling so that the uneven surface becomes substantially smooth to create a pattern, and a method for forming a decorative surface in which this troweled layer has a shadow or shading pattern has been proposed (see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The prior art described in Patent Document 1 includes a plastering material and a plastering method to which specific polyamide reinforcing fibers are added to an inorganic plastering material. However, the fibers are added solely for reinforcement and not to enhance the aesthetic appearance. Furthermore, the prior art described in Patent Document 2 requires a process of applying a semi-fluid paint in layers or more with a trowel to create a decorative surface with shading or gradation patterns. This presents the problem that only plasterers with troweling skills can create a decorative surface with shading or gradation patterns.

[0006] Therefore, the present invention aims to solve the problems of the prior art by providing a coating method in which a plastering material, mainly composed of a synthetic resin emulsion, is mixed with a specific amount of a coloring material and short fibers of a specific fiber length, and then applied with a trowel followed by a top coat layer. [Means for solving the problem]

[0007] The plastering material of the present invention is characterized by comprising a plastering material mainly composed of a synthetic resin emulsion, short fibers with a fiber length of 1 to 30 mm, and a coloring material, wherein the content (A) of the short fibers per unit of solids is 0.1 to 9% by weight.

[0008] The present invention relates to a plastering material characterized in that the short fibers are cellulose-based fibers such as cotton, hemp, and rayon, and at least a portion of them are colored.

[0009] Furthermore, the plastering material of the present invention is characterized in that the short fibers are obtained by crushing woven or knitted fabrics.

[0010] The present invention provides a method for applying plastering materials, comprising the steps of: applying the plastering material with a trowel to form a base layer having irregularities on a substrate; and applying one or more layers of plastering material with a trowel onto the obtained base layer, the plastering material containing a synthetic resin emulsion and a coloring material, wherein the ratio of the total weight parts of short fibers in the topcoat layer (D) to the weight parts of short fibers in the undercoat layer (C) ((D) / (C)) is 0.15 or less, and the content of short fibers per unit solid content of the topcoat layer (B) is less than 1% by weight, thereby smoothing the surface, and forming a pattern of light and dark shades on the painted surface.

[0011] Furthermore, the plastering material application method of the present invention is characterized by including an intermediate layer between the undercoat layer and the topcoat layer.

[0012] The present invention relates to a coated product having a base coat layer and a top coat layer formed on a substrate, wherein the base coat layer is a cured plastering material containing short fibers with a fiber length of 1 to 30 mm and a coloring material in a cured synthetic resin emulsion, the top coat layer is a cured plastering material containing a coloring material in a cured synthetic resin emulsion, the content of short fibers per unit solid content (B) is less than 1% by weight, the ratio ((D) / (C)) of the total weight parts of short fibers in the top coat layer (D) to the weight parts of short fibers in the base coat layer (C) is 0.15 or less, the interface between the top coat layer and the layer adjacent to it below it has irregularities, the surface of the coated product is smooth, and the surface of the coated product has a shading pattern. [Effects of the Invention]

[0013] The plastering material for coating containing short fibers of a specific fiber length according to the present invention exhibits good dispersion of short fibers in the plastering material, resulting in a uniform plastering material with excellent preservation properties and trowel application properties. According to the plastering material coating method of the present invention, a smooth pattern of varying shades can be easily formed on the painted surface. The coated material of the present invention has a smooth surface and a highly aesthetically pleasing pattern of varying shades on its surface. [Modes for carrying out the invention]

[0014] The present invention will be described in detail below. The plastering material of the present invention consists of a plastering material mainly composed of a synthetic resin emulsion, short fibers, and a coloring material.

[0015] Plastering materials are used to create walls, interior walls (such as those in Japanese-style rooms), and floors of buildings, using trowel-based application techniques. They harden through chemical reactions with water and air. Representative plastering materials include lime plaster, diatomaceous earth, Juraku plaster, mortar, and cement mortar, and materials mixed with polymers are also used. The plastering material of the present invention is not particularly limited as long as it is mainly composed of a synthetic resin emulsion, and any such material can be used.

[0016] There are no particular restrictions on the synthetic resin emulsion, and any known commercially available product can be used. Specifically, examples include acrylic acid, acrylic acid derivatives such as 2-ethylhexyl acrylate, methacrylic acid, methacrylic acid derivatives such as 2-ethylhexyl methacrylate, vinyl acetate, butadiene, styrene-butadiene copolymer, methyl methacrylate, and acrylonitrile.

[0017] Short fibers are the most important material for exhibiting the effects of the present invention. While there are no particular restrictions on the material of the short fibers as long as the fiber length is 1 to 30 mm, cellulose fibers such as cotton, linen, and rayon are preferred due to their good compatibility with plastering materials, ease of dispersion, and miscibility with plastering materials. The fiber length is in the range of 1 to 30 mm, but the range of 2 to 20 mm is preferred, and the range of 3 to 15 mm is even more preferred. Fibers with a length of less than 1 mm cannot be produced industrially stably. On the other hand, if the length exceeds 30 mm, aggregation of short fibers occurs in the plastering material, making it impossible to obtain a uniform plastering material.

[0018] The content per solid content of the short fibers in the plaster material (A) is 0.1 to 9% by weight. 0.15 to 8% by weight is preferable, and 0.5 to 5% by weight is more preferable. When the content per solid content of the short fibers in the plaster material is less than 0.1% by weight, the dispersion of the short fibers in the plaster material is good, the plaster material is uniform, and the trowel coating property is also good. However, the obtained coated product has no shading pattern and lacks designability. On the other hand, when it exceeds 9% by weight, the plaster material has the short fibers dispersed and is uniform, but the trowel coating property is not good. Further, aggregates like short fiber aggregates were seen in the obtained coated product and the designability was not good.

[0019] There are no particular restrictions on the fiber physical properties of the short fibers such as fineness and strength. It is preferable that at least a part of the short fibers is colored from the viewpoint of enhancing the designability of the coated product of the present invention. Furthermore, short fibers obtained by pulverizing woven or knitted fabrics are preferable from the viewpoint of ecology, and short fibers obtained from cut scraps, sewing scraps, and discarded clothes, woven or knitted fabrics such as trousers and skirts during apparel production are particularly preferable.

[0020] There are no particular restrictions on the coloring material, and dyes and pigments can be used. However, pigments with small particle sizes are preferable. The color is also not particularly restricted, and a preferred color can be appropriately selected.

[0021] Subsequently, the coating method of the plaster material of the present invention will be described. First, a plaster material composed of a synthetic resin emulsion as the main material, short fibers, and a coloring material is trowel-coated on a substrate and then dried for one day or more to form an undercoat layer having unevenness. Then, after polishing the surface of the obtained undercoat layer, a plaster material containing a synthetic resin emulsion and a coloring material and having a short fiber content of less than 1% by weight is trowel-coated on the obtained undercoat layer to form a topcoat layer. Then, after drying for one day or more, the surface of the topcoat layer is polished. Further, if necessary, a topcoat layer is formed in the same manner as described above, and after drying, it is polished to obtain a smooth surface.

[0022] The content (B) of the short fibers per solid content in the plaster material used for the top coat layer is less than 1% by weight. If the content of the short fibers per solid content is 1% by weight or more, the shading pattern obtained in the bottom coat layer may be impaired, which is not preferable.

[0023] The weight part (D) of the short fibers in the top coat layer is such that the ratio ((D) / (C)) of the weight part (C) of the short fibers contained in the bottom coat layer is 0.15 or less, and ((D) / (C)) is preferably 0.1 or less. If ((D) / (C)) exceeds 0.15, the shading pattern obtained in the bottom coat layer may be impaired, which is not preferable from the viewpoint of designability.

[0024] Also, an intermediate layer can be provided between the bottom coat layer and the top coat layer as necessary. Specifically, after applying the plaster material on the bottom coat layer with a trowel and drying for one day or more to form the intermediate layer, the surface of the intermediate layer is polished. Then, the top coat layer is formed. The plaster material used for the intermediate layer may or may not contain short fibers.

[0025] The coated article obtained by the coating method using the plaster material has a smooth surface and a shading pattern on the surface of the coated article.

[0026] Such a coated article is applied to building parts such as interior and exterior walls, floors, and ceilings, which are the uses of conventional plaster materials. However, since the coated article of the present invention is excellent in designability, it is preferably applied to interior goods such as furniture, tables, desks, chairs, and picture frames.

Examples

[0027] Examples of the present invention are shown below, but the present invention is not limited thereto. Evaluation criteria for examples

[0028] The physical property results of the examples and comparative examples are shown in the table below, and the evaluation criteria for the determination are as follows. Evaluation criteria: ◎ = very excellent, ○ = excellent, △ = slightly bad, × = bad

[0029] Example 1 A plastering material for coating was prepared by mixing 50 parts by weight of an acrylic resin emulsion with a resin solids content of approximately 50% by weight, 20 parts by weight of sunflower oil, and 30 parts by weight of quartz. To this mixture, 1 part by weight of blue cotton short fibers crushed from jeans and cut to approximately 5 mm, and 0.1 parts by weight of indigo dye (Urakami Dye Shop) were added and stirred to create a uniform mixture. The short fibers in the prepared plastering material were well dispersed, the material was uniform, and the short fiber content per solids in the plastering material was 0.99% by weight.

[0030] This was applied to the substrate with a trowel and then dried for one day to obtain a base coat layer. The trowel-applied properties of the applied plastering material were very good. The amount of base coat layer applied was 2 kg / m2.

[0031] Next, the obtained undercoat layer was sanded using 120-grit wood sandpaper attached to a random orbital sander. Then, a plastering material was prepared by mixing 50 parts by weight of acrylic resin emulsion with approximately 50% resin solids by weight and 20 parts by weight of sunflower oil, adding 0.4 parts by weight of indigo dye, stirring to make it uniform, and applying this plastering material to the undercoat layer prepared above with a trowel, followed by drying for one day to obtain topcoat layer 1. The application rate of the obtained topcoat layer 1 was 0.5 kg / m2.

[0032] Next, the obtained topcoat layer 1 was polished in the same manner as described above. Then, the plastering material used for topcoat layer 1 was troweled onto the prepared topcoat layer 1 and dried for one day to obtain topcoat layer 2. The application amount of the obtained topcoat layer 2 was 0.2 kg / m2. After that, the obtained topcoat layer 2 was polished in the same manner, and then the water-based coating agent EcoPico (Oltre Material Co., Ltd.) was applied twice to obtain the coated product.

[0033] The ratio ((D) / (C)) of the total weight parts of short fibers in the topcoat layer (D) to the weight parts of short fibers in the undercoat layer (C) of the obtained coated material was 0. The coated material had a dense and uniform shading pattern that appeared to originate from the short fibers, and was extremely aesthetically pleasing. The test results are shown in Table 1.

[0034] Example 2 A primer layer was obtained in the same manner as in Example 1, except that the weight of the indigo dye and cotton short fibers used was changed. The dispersibility of the plastering material was good and uniform, and the short fiber content (per solids) was 0.2% by weight. The trowelability of the applied plastering material was very good.

[0035] Next, a plastering material for coating was prepared by mixing 50 parts by weight of the acrylic resin emulsion with a resin solid content of approximately 50% by weight used above, 20 parts by weight of sunflower oil, and 30 parts by weight of quartz. To this mixture, 1 part by weight of the short cotton fibers used in Example 1 and 0.4 parts by weight of indigo dye were added and stirred to create a uniform mixture. After polishing the base coat obtained above in the same manner as described above, the prepared plastering material for coating was applied with a trowel onto the polished base coat and dried for one day to obtain an intermediate layer. The trowelability of the applied intermediate layer plastering material was very good. The amount of the obtained intermediate layer applied was 0.5 kg / m2.

[0036] Next, after obtaining a topcoat layer 1 in the same manner as in Example 1, the water-based coating agent EcoPico was applied twice to obtain a coated object. The ratio ((D) / (C)) of the parts by weight of short fibers in the topcoat layer (D) to the parts by weight of short fibers in the undercoat layer (C) of the obtained coated object was 0. The coated object had a uniform shading pattern and good aesthetic appeal. The test results are shown in Table 1.

[0037] Example 3 A coated product was obtained in the same manner as in Example 1, except that the acrylic resin emulsion used in the example was replaced with a styrene-butadiene resin emulsion with a resin solids content of approximately 50% by weight, the indigo dye was replaced with Mine Blue Pigment (manufactured by Yabuhara Co., Ltd.), and the weights of sunflower oil, quartz, and cotton short fibers used were changed.

[0038] The short fibers in the plastering material used for the undercoat layer exhibited good dispersion, resulting in a uniform plastering material. The trowel application properties were excellent, with a short fiber content (per solid content) of 4.16% by weight. Furthermore, the pattern of the coated material was dense and uniform in shades, demonstrating excellent aesthetic appeal. The test results are shown in Table 1.

[0039] Example 4 A coated material was obtained in the same manner as in Example 1, except that the weights of sunflower oil, quartz, and cotton short fibers used in Example 1 were changed.

[0040] The short fibers in the plastering material used for the undercoat layer exhibited good dispersion, the plastering material was uniform, and the trowel application properties were very good. The short fiber content (per solid content) was 8.59% by weight. Furthermore, the pattern of the coated material was uniform in shades of gray, and the aesthetic appeal of the coated material was good. The test results are shown in Table 1.

[0041] Example 5 After obtaining a base coat layer in the same manner as in Example 1, an intermediate layer was obtained in the same manner as in Example 2, except that the short fibers of the plastering material used for the intermediate layer in Example 2 were removed. The trowel-applied properties of the applied intermediate layer plastering material were very good. Next, a coated object was obtained in the same manner as in Example 1. The pattern of the coated object was uniform in shades of gray, and the aesthetic appeal of the coated object was excellent. The test results are shown in Table 1.

[0042] Comparative Example 1 A coated product was obtained in the same manner as in Example 1, except that the weight of the short cotton fibers used in the plastering material for coating used in the undercoat layer in Example 1 was changed.

[0043] The plastering material used for the undercoat layer exhibited good and uniform dispersibility, and its trowel application properties were excellent. The short fiber content (per solid content) was 0.06% by weight. The resulting coating lacked color variation and aesthetic appeal. The test results are shown in Table 1.

[0044] Comparative Example 2 A coated product was obtained in the same manner as in Example 2, except that the weight of the short cotton fibers used was changed.

[0045] The plastering material used for the undercoat layer had uniformly dispersed short fibers, but its trowel application properties were poor. The short fiber content (per solid content) was 9.08% by weight. The resulting coating showed aggregates of short fibers, resulting in poor aesthetic quality. The test results are shown in Table 1.

[0046] Comparative Example 3 A coated product was obtained in the same manner as in Example 1, except that the weight of the short cotton fibers used was changed.

[0047] The plastering material used for the undercoat layer had uniformly dispersed short fibers, but it was difficult to spread the material evenly, resulting in poor trowel application. The short fiber content (per solid content) was 10.7% by weight. The resulting coating showed aggregates of short fibers and uneven patterns, resulting in poor aesthetic quality. The test results are shown in Table 1.

[0048] Example 6 After obtaining a base coat layer in the same manner as in Example 1, a plastering material was applied to the base coat layer using a trowel. This material was made by adding 0.1 parts by weight of cotton short fibers cut to approximately 5 mm to the plastering material used for the top coat layer 1 in Example 1. The short fiber content (per solids) of the top coat layer 1 was 0.14% by weight. A coated product was then obtained in the same manner as in Example 1. The ratio ((D) / (C)) of the short fibers in the top coat layer 1 to the short fibers in the base coat layer ((D)) of the obtained coated product was 0.042. The coated product had a dense and uniform shading pattern similar to that of Example 1, and its aesthetic appeal was excellent. The test results are shown in Table 2.

[0049] Example 7 After obtaining a base coat layer in the same manner as in Example 1, an intermediate layer was obtained in the same manner as in Example 2, except that the amount of short fibers in the plastering material for the intermediate layer used in Example 2 was changed to 0.3 parts by weight. The trowelability of the applied intermediate layer plastering material was very good. Next, a coated product was obtained in the same manner as in Example 1, except that the amount of short fibers in the plastering materials for top coat layer 1 and top coat layer 2 used in Example 1 was changed. The short fiber content (per solid content) of top coat layer 1 was 0.42% by weight. The short fiber content (per solid content) of top coat layer 2 was 0.14% by weight. The parts by weight of short fibers in the base coat layer of the obtained coated product (C) was 0.026 kg / m2, and the total parts by weight of short fibers in the top coat layer (D) was 0.004 kg / m2. The ratio ((D) / (C)) of the total parts by weight of short fibers in the top coat layer (D) to the parts by weight of short fibers in the base coat layer (C) of the obtained coated product (D) was 0.142. The aforementioned coated material had a uniform pattern of varying shades and exhibited good aesthetic appeal. The test results are shown in Table 2.

[0050] Comparative Example 4 A primer layer was obtained in the same manner as in Example 1. Without applying a topcoat layer on top of the obtained primer layer, the primer layer obtained in the same manner as in Example 1 was polished, and then the water-based coating agent EcoPico was applied twice to obtain a coated product. The obtained coated product lacked shading patterns and had poor aesthetic appeal. The test results are shown in Table 2.

[0051] Comparative Example 5 Without applying the undercoat layer used in Example 1, the plastering material of topcoat layer 1 used in Example 1 was applied to the substrate, and the coated product was obtained in the same manner as in Example 1 thereafter. The obtained coated product lacked shading patterns and had poor aesthetic appeal. The test results are shown in Table 2.

[0052] Comparative Example 6 In Example 7, a coated product was obtained in the same manner as in Example 7, except that the amount of cotton short fibers used in the intermediate layer of the plastering material was changed to 0.4 parts by weight, the amount of cotton short fibers used in the topcoat layer 1 was changed to 0.4 parts by weight, and the cotton short fibers used in the topcoat layer 2 were omitted. The trowel application properties of the applied intermediate layer plastering material were very good. The short fiber content (per solid content) of topcoat layer 1 was 0.57% by weight. The ratio ((D) / (C)) of the total parts by weight of short fibers in the topcoat layer (D) to the parts by weight of short fibers in the undercoat layer (C) of the obtained coated product was 0.166. The obtained coated product showed some unevenness in the pattern and had poor aesthetic appeal. The test results are shown in Table 2.

[0053] Comparative Example 7 A coated product was obtained in the same manner as in Comparative Example 6, except that the amount of cotton short fibers used in the intermediate layer of the plastering material was changed to 0.6 parts by weight, and the amount of cotton short fibers used in the topcoat layer 1 was also changed to 0.6 parts by weight. The trowel application properties of the applied intermediate layer plastering material were very good. The short fiber content (per solid content) of topcoat layer 1 was 0.85% by weight. The ratio ((D) / (C)) of the total parts by weight of short fibers in the topcoat layer (D) to the parts by weight of short fibers in the undercoat layer (C) of the obtained coated product was 0.248. The obtained coated product showed some unevenness in the pattern and had poor aesthetic appeal. The test results are shown in Table 2.

[0054] Comparative Example 8 A coated material was obtained in the same manner as in Example 1, except that the weight of the cotton short fibers used in the topcoat layer 1 of the plastering material was changed. The short fiber content (per solid content) of topcoat layer 1 was 1.12% by weight. The ratio ((D) / (C)) of the total weight parts of short fibers in the topcoat layer (D) to the weight parts of short fibers in the undercoat layer (C) of the obtained coated material was 0.329. The obtained coated material showed unevenness in the pattern and had poor aesthetic appeal. The test results are shown in Table 2.

[0055] Examples 8-10 The blue short cotton fibers cut to approximately 5 mm for the undercoat layer used in Example 1 were varied in fiber type, fiber length, and color, and coated materials were obtained in the same manner as in Example 1. In all of the plastering materials used for coating, the dispersion of short fibers in the material was good, and the plastering material was uniform. The results of the troweling properties of the plastering materials and the aesthetic properties of the obtained coated materials are shown in Table 3.

[0056] Comparative Example 9 We attempted to produce 0.5 mm short fibers from blue-dyed cotton, but we were unable to obtain consistently cut short fibers using industrial equipment. The test results are shown in Table 3.

[0057] Comparative Example 10 In this experiment, a coated material was obtained in the same manner as in Example 1, except that the length of the blue cotton short fibers, cut to approximately 5 mm for the undercoat layer used in Example 1, was changed to 35 mm. Due to the larger fiber length, the dispersion of the short fibers in the material was poor, resulting in an uneven plastering material. Consequently, the trowel application of the plastering material was poor, and the resulting coated material exhibited uneven patterns, resulting in poor aesthetic appeal. The test results are shown in Table 3.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3] [Industrial applicability]

[0061] The plastering material of the present invention can be used in the same way as conventional plastering materials, and is best applied with a trowel. The coated material obtained by the coating method of the present invention has a smooth surface and a fine, nuanced pattern with excellent design. For this reason, it is readily applied to building components such as interior and exterior walls, floors, and ceilings, as well as interior furnishings such as furniture, tables, desks, and chairs.

Claims

1. A plastering material primarily composed of synthetic resin emulsion, consisting of short fibers with a fiber length of 1 to 30 mm and coloring materials. A plastering material for undercoating in which the content (A) of the short fibers per unit of solids is 0.1 to 9% by weight, The synthetic resin emulsion, the coloring material, and the short fibers are comprised of the above, A plastering material for topcoating, wherein the content (B) of the short fibers per unit of solids is less than 1% by weight, A plastering material characterized in that the ratio (D) / C (total weight parts of short fibers in the topcoat plastering material to weight parts of short fibers in the undercoat plastering material) is 0.15 or less.

2. The plastering material according to claim 1, characterized in that the short fibers are cellulose fibers of cotton, linen, or rayon, and at least a portion of them are colored.

3. The plastering material according to claim 2, characterized in that the short fibers are obtained by crushing a woven or knitted fabric.

4. A method for applying plastering materials, characterized by comprising the steps of: applying a plastering material according to any one of claims 1 to 3 with a trowel to form an undercoat layer having irregularities on a substrate; and applying one or more layers of a plastering material on the obtained undercoat layer with a trowel, wherein the material contains a synthetic resin emulsion and a coloring material, the ratio of the total weight parts (D) of short fibers in the topcoat layer to the weight parts (C) of short fibers in the undercoat layer ((D) / (C)) is 0.15 or less, and the content (B) of short fibers per solid content of the topcoat layer is less than 1% by weight, to smooth the surface, thereby forming a pattern of light and dark shades on the painted surface.

5. A method for applying plastering materials according to claim 4, characterized in that it includes an intermediate layer between the undercoat layer and the topcoat layer.

6. A coated product having a base coat layer and a top coat layer formed on a substrate, wherein the base coat layer is a plastering material cured product containing short fibers with a fiber length of 1 to 30 mm and a coloring material in a synthetic resin emulsion cured product, the top coat layer is a plastering material cured product containing a coloring material in a synthetic resin emulsion cured product, the content of short fibers per unit solid content (B) is less than 1% by weight, the ratio ((D) / (C)) of the total weight parts of short fibers in the top coat layer (D) to the weight parts of short fibers in the base coat layer (C) is 0.15 or less, the interface between the top coat layer and the layer adjacent to it below it has irregularities, the surface of the coated product is smooth, and the surface of the coated product has a pattern of light and dark shades.

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