JP2021084242A - Decorative paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative paper having excellent processing suitability and abrasion resistance. SOLUTION: An ink layer 3 and a surface protective layer 4 are provided in this order on one surface side of a paper base material 2, and the ink layer 3 contains a mixed resin of a polyurethane resin and a nitrocellulose resin and has a surface. The protective layer 4 is a decorative paper 1 containing a thermosetting resin containing an acrylic polyol and an isocyanate compound and inorganic particles 9 and 10. [Selection diagram] Fig. 1

Description

The present invention relates to decorative paper.

Conventionally, a decorative paper having an ink layer and a surface protective layer in this order on one surface of a paper base material has been proposed (see, for example, Patent Document 1). In the decorative paper described in Patent Document 1, the ink layer contains a binder made of a mixed resin of nitrocellulose and an alkyd resin, and the surface protective layer contains an ionizing radiation curable resin.

JP-A-2002-36484

By the way, decorative paper used for shelves for storing building materials is required to have abrasion resistance because objects are placed on it. The decorative paper described in Patent Document 1 has excellent abrasion resistance, but there is a possibility that curling, paper breakage, and cracks on the coating film surface may occur during processing such as V-cutting and wrapping.
The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide a decorative paper having excellent processability and abrasion resistance.

In one aspect of the present invention, (a) an ink layer and a surface protective layer are provided in this order on one surface side of a paper base material, and (b) the ink layer is a mixed resin of a polyurethane resin and a nitrocellulose resin. The gist is that the surface protective layer (c) is a decorative paper containing a thermosetting resin containing an acrylic polyol and an isocyanate compound and inorganic particles.

According to one aspect of the present invention, the flexibility of the ink layer can be improved by the mixed resin of the ink layer, and cracking of the ink layer during processing can be prevented. Further, the abrasion resistance can be improved by the inorganic particles contained in the surface protective layer. Therefore, it is possible to provide a decorative paper having excellent processability and abrasion resistance.

It is sectional drawing which shows the decorative paper which concerns on embodiment of this invention.

Next, an embodiment of the present invention will be described with reference to the drawings.
Here, the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the materials, shapes, structures, etc. of the constituent parts as follows. It is not something that is specific to something. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.

(Constitution)
As shown in FIG. 1, the decorative paper 1 has an ink layer 3 and a surface protective layer 4 in this order on one surface (hereinafter, also referred to as “upper surface 2a”) side of the paper base material 2. ..
(Paper base material)
The paper base material 2 is a base material that is the base of the decorative paper 1. As the paper base material 2, for example, thin paper, inter-paper reinforced paper, kraft paper, high-quality paper, linter paper, baryta paper, sulfate paper, Japanese paper and the like can be adopted. In particular, inter-paper reinforced paper is suitable. The basis weight of the paper substrate 2, and 20g / m ² ~150g / m ² approximately. The thickness of the paper base material 2 is about 20 μm to 200 μm.

(Ink layer)
The ink layer 3 includes a solid ink layer 5 and a pattern ink layer 6 provided on the surface 5a side of the solid ink layer 5 facing the surface protective layer 4.
The solid ink layer 5 is a monochromatic layer that forms the background of the pattern ink layer 6 in order to improve the design of the pattern ink layer 6. The solid ink layer 5 is formed by using a printing ink obtained by dissolving or dispersing a colorant such as a dye or a pigment in a diluting solvent together with a binder resin. For the application of the printing ink, for example, various printing methods such as a gravure printing method, an offset printing method and an inkjet printing, or various coating methods such as a gravure coating method and a roll coating method are used. As the pigment, for example, known pigments such as titanium oxide, zinc oxide, carbon black, iron oxide, organic pigments and metallic pigments can be adopted. Further, as the binder resin, a mixed resin of a polyurethane resin and a nitrocellulose resin is used. That is, the resin constituting the solid ink layer 5 is a mixed resin of a polyurethane resin and a nitrocellulose resin.

The ratio of the polyurethane resin and the nitrocellulose resin in the solid ink layer 5 is 60% by mass or more and 80% by mass or less for the polyurethane resin and 20% by mass or more and 40% by mass or less for the nitrocellulose resin with respect to the total mass of the solid ink layer 5. Is preferable. When the polyurethane resin is less than 60% by mass, the solid ink layer 5 becomes soft, so that the performance of dented scratches such as pencil hardness (the surface performance of the scratches pushed in) deteriorates. Further, when the polyurethane resin is larger than 80% by mass, cracks are likely to occur during the V-cut processing. On the other hand, when the nitrocellulose resin is less than 20% by mass, cracks are likely to occur during the V-cut processing. When the nitrocellulose resin is larger than 40% by mass, the solid ink layer 5 becomes soft, so that the performance of dented scratches such as pencil hardness (surface performance of the scratches pushed in) deteriorates.
The thickness of the solid ink layer 5 is about 0.1 μm or more and 0.2 μm or less.

The pattern ink layer 6 is a layer for imparting a design property to the decorative paper 1 by a pattern. As the pattern, for example, a wood grain pattern, a stone grain pattern, a cloth grain pattern, a tile-like pattern, a brick-like pattern, a leather squeezing pattern, and characters can be adopted. Similar to the solid ink layer 5, the pattern ink layer 6 is formed by using a printing ink obtained by dissolving or dispersing a colorant such as a dye or a pigment in a diluting solvent together with a binder resin. For the application of the printing ink, for example, various printing methods such as a gravure printing method, an offset printing method, and an inkjet printing are used. As the pigment and the binder resin, a known mixed resin of a pigment, a polyurethane resin and a nitrocellulose resin is used as in the case of the solid ink layer 5. Similar to the solid ink layer 5, the ratio of the polyurethane resin and the nitrocellulose resin in the pattern ink layer 6 is 60% by mass or more and 80% by mass or less of the polyurethane resin and 20% by mass of the nitrocellulose resin with respect to the total mass of the pattern ink layer 6. It is preferably mass% or more and 40 mass% or less. The thickness of the pattern ink layer 6 is about 0.1 μm or more and 0.2 μm or less.

(Surface protective layer)
The surface protective layer 4 includes a first surface protective layer 7 and a second surface protective layer 8 provided on the surface 7a side of the first surface protective layer 7 opposite to the surface facing the ink layer 3.
The first surface protective layer 7 is a layer for covering the ink layer 3. The first surface protective layer 7 is formed by using a thermosetting resin containing an acrylic polyol and an isocyanate compound (curing agent). As the acrylic polyol, an acrylic polymer having two or more hydroxyl groups in the molecule can be used. Specifically, a copolymer obtained by copolymerizing a hydroxyl group-containing acrylate and a copolymerizable vinyl monomer copolymerizable with the hydroxyl group-containing acrylate is preferable. Further, as the isocyanate compound, for example, various aromatic and aliphatic isocyanate compounds can be used. Specifically, it is preferably one or more selected from tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), xylylene diisocyanate (XDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI). In particular, TDI is most preferred. For coating the thermosetting resin, for example, various printing methods such as a gravure printing method, an offset printing method, and an inkjet printing, or various coating methods such as a gravure coating method and a roll coating method are used.

Further, the first surface protective layer 7 contains inorganic particles 9. As the inorganic particles 9, for example, alumina (α-alumina or the like), aluminosilicate, silica, glass, silicon carbide, boron nitride, diamond or the like can be adopted. Abrasion resistance can be improved by containing the inorganic particles 9. In particular, as the inorganic particles 9, alumina having an average particle size of 5 μm or more and 30 μm or less is preferable. Here, the average particle size is the average particle size obtained by microscopic observation. For the average particle size by microscopic observation, for example, the inorganic particle 9 (alumina) is observed under a microscope, and 100 particle sizes of the inorganic particle 9 (alumina) observed under a microscope are measured with image processing software or the like, and the number of measurement results is obtained. Obtained by averaging. As the particle size of the inorganic particles 9 (alumina), the average value of the major axis diameter and the minor axis diameter of the particles of the inorganic particles 9 (alumina) can be adopted. When the average particle size of the inorganic particles 9 (alumina) is smaller than 5 μm, dents such as pencil hardness and wear resistance performance deteriorate. On the other hand, if it is larger than 30 μm, the smoothness of the surface is lost and the stain resistance is lowered. The content of the inorganic particles 9 (alumina) is 30% by mass or more and 60% by mass or less with respect to the total mass of the first surface protective layer 7. If it is less than 30% by mass, the surface performance such as scratch resistance and wear resistance deteriorates. If it is larger than 60% by mass, it becomes difficult to form a coating film, so that the purpose of the surface protective layer itself (the first surface protective layer 7 itself) is lost.

Further, the thickness of the first surface protective layer 7 is preferably 0.5 times or more and 2 times or less the average particle size of the inorganic particles 9 (alumina). If it is less than 0.5 times, the inorganic particles 9 (alumina) may protrude from the first surface protective layer 7, so that the coating film is likely to be cracked during the V-cut process. If it is larger than twice, the coating thickness becomes thicker and the inorganic particles 9 (alumina) are buried in the first surface protective layer 7, so that the pencil hardness and abrasion resistance are deteriorated.
The phrase "the first surface protective layer 7 contains the inorganic particles 9" means that more than half of the volume of the inorganic particles 9 is contained in the first surface protective layer 1. In FIG. 1, a part of each inorganic particle 9 is contained in the second surface protective layer 8, but since the volume of the inorganic particle 9 contained in the second surface protective layer 8 is smaller than half, the first The surface protective layer 8 is contained only in the inorganic particles 9.

The second surface protective layer 8 is a layer for covering the first surface protective layer 7. The second surface protective layer 8 is also formed by using a thermosetting resin containing an acrylic polyol and an isocyanate compound (curing agent), similarly to the first surface protective layer 7. As a method for applying the acrylic polyol, the isocyanate compound, and the thermosetting resin, the same method as that for the first surface protective layer 7 can be adopted.
Further, the second surface protective layer 8 contains the inorganic particles 10. As the inorganic particles 10, for example, alumina (α-alumina or the like), aluminosilicate, silica, glass, silicon carbide, boron nitride, diamond or the like can be adopted. Abrasion resistance can be improved by containing the inorganic particles 10. In particular, as the inorganic particles 10, silica having an average particle size of 1 μm or more and 10 μm or less is preferable. When the average particle size of the inorganic particles 10 (silica) is smaller than 1 μm, the performance such as pencil hardness and abrasion resistance deteriorates. On the other hand, if it is larger than 10 μm, the inorganic particles 10 (silica) may protrude from the second surface protective layer 8, so that the coating film is likely to be cracked during the V-cut process. The content of the inorganic particles 10 (silica) is 10% by mass or more and 50% by mass or less with respect to the total mass of the second surface protective layer 8. If it is less than 10% by mass, the surface performance such as scratch resistance and wear resistance deteriorates. If it is larger than 50% by mass, it becomes difficult to form a coating film, so that the purpose of the second surface protective layer 8 itself is lost.

Further, the thickness of the second surface protective layer 8 is preferably 1 to 3 times or less the average particle size of the inorganic particles 10 (silica). If it is less than 1 times, the inorganic particles 9 (alumina) of the first surface protective layer 7 protrude from the second surface protective layer 8, so that the coating film is likely to be cracked during the V-cut process. If it is larger than 3 times, the coating thickness becomes thick and the inorganic particles 10 and the inorganic particles 9 (alumina) are buried, so that the pencil hardness and the wear resistance are deteriorated.
If necessary, various additives may be added to the thermosetting resins of the first surface protective layer 7 and the second surface protective layer 8. Examples of the additive include a vinyl chloride-vinyl acetate copolymer, a thermoplastic resin such as a vinyl acetate resin, an acrylic resin and a cellulose resin, and an extender pigment (filler) composed of fine powders such as calcium carbonate and barium sulfate. Lubricants such as silicone resins and waxes, and colorants such as dyes and pigments can be used.

As described above, the decorative paper 1 according to the present embodiment has the ink layer 3 and the surface protective layer 4 in this order on one surface (upper surface 2a) side of the paper base material 2. Further, the ink layer 3 is made to contain a mixed resin of a polyurethane resin and a nitrocellulose resin. Further, the surface protective layer 4 is made to contain a thermosetting resin containing an acrylic polyol and an isocyanate compound, and inorganic particles (at least one of the inorganic particles 9 and the inorganic particles 10). Therefore, the flexibility of the ink layer 3 can be improved by the mixed resin of the ink layer 3, and cracking of the ink layer 3 during processing can be prevented. Further, the abrasion resistance can be improved by the inorganic particles contained in the surface protective layer 4. Therefore, it is possible to provide the decorative paper 1 having excellent processability and abrasion resistance.

Further, in the decorative paper 1 according to the present embodiment, the surface protective layer 4 is provided on the surface 7a side of the first surface protective layer 7 and the surface of the first surface protective layer 7 opposite to the surface facing the ink layer 3. A second surface protective layer 8 is provided. Further, the inorganic particles 9 contained in the first surface protective layer 7 were made of alumina having an average particle size of 5 μm or more and 30 μm or less. Therefore, scratch resistance can be improved. Further, since the inorganic particles 9 (alumina) having a large particle size are contained in the first surface protective layer 7, that is, the layer inside the outermost layer, the inorganic particles 9 (alumina) are contained on the surface of the decorative paper 1. The possibility of protrusion can be reduced, and the possibility of cracking from this portion during V-cut processing can be reduced.

Further, in the decorative paper 1 according to the present embodiment, the inorganic particles 10 contained in the second surface protective layer 8 are made of silica having an average particle size of 1 μm or more and 10 μm or less. That is, the inorganic particles 10 (silica) having a small particle size are contained in the second surface protective layer 8, that is, the outermost layer. Therefore, it is possible to compensate for the decrease in scratch resistance due to the fact that the inorganic particles 9 (alumina) do not protrude.
Further, in the decorative paper 1 according to the present embodiment, the ink layer 3 includes a solid ink layer 5 and a pattern ink layer 6 provided on the surface 5a side of the solid ink layer 5 facing the surface protective layer 4. .. Therefore, the design of the decorative paper 1 can be further improved.

(Example)
Hereinafter, examples and comparative examples of the decorative paper 1 according to the above embodiment will be described.
(Example 1)
^{First, as the paper base material 2,} an inter-paper reinforced paper having a basis weight of 30 g / m 2 was prepared. Subsequently, a printing ink using a mixed resin of a polyurethane resin and a nitrocellulose resin as a binder resin and titanium dioxide as a pigment is applied onto one surface 2a of the paper substrate 2 by a gravure printing method, and the solid ink layer 5 is applied. Was formed. Subsequently, a printing ink using a mixed resin of a polyurethane resin and a nitrocellulose resin as a binder resin was applied onto the solid ink layer 5 by a gravure printing method to form a pattern ink layer 6. The binder resin of the printing ink of the solid ink layer 5 and the pattern ink layer 6 was 80% by mass of the polyurethane resin and 20% by mass of the nitrocellulose resin with respect to the total mass of each layer. Subsequently, a resin for forming the first surface protective layer 7 containing the inorganic particles 9 was applied onto the pattern ink layer 6 by gravure printing to form the first surface protective layer 7.

As the resin for forming the first surface protective layer 7, a thermosetting resin containing an acrylic polyol and hexamethylene diisocyanate (isocyanate compound) was used. As the inorganic particles 9, alumina having an average particle size of 25 μm was used. 20 parts by mass of alumina was added to 100 parts by mass of the resin constituting the first surface protective layer 7. The resin for forming the first surface protective layer 7 contains 20 parts by mass of a hexamethylene diisocyanate-based curing agent with respect to 100 parts by mass of the resin (resin for forming the first surface protective layer 7), and a silicone acrylate-based additive (resin). 2 parts by mass was added to 100 parts by mass of the first surface protective layer 7 forming resin). The coating amount was 7 g / m ² .

Subsequently, a resin for forming the second surface protective layer 8 containing the inorganic particles 10 was applied onto the first surface protective layer 7 by gravure printing to form the second surface protective layer 8. As the resin for forming the second surface protective layer 8, a thermosetting resin containing an acrylic polyol and hexamethylene diisocyanate (isocyanate compound) was used. As the inorganic particles 10, silica having an average particle size of 3 μm was used. 15 parts by mass of silica was added to 100 parts by mass of the resin constituting the second surface protective layer 8. The coating amount was 3 g / m ² . The resin for forming the first surface protective layer 7 and the resin for forming the second surface protective layer 8 contain 20 parts by mass of a hexamethylene diisocyanate-based curing agent with respect to 100 parts by mass of the resin (resin for forming the second surface protective layer 8). 2 parts by mass of a silicone acrylate-based additive was added to 100 parts by mass of the resin (resin for forming the second surface protective layer 8).

(Example 2)
In Example 2, the binder resin of the printing ink of the solid ink layer 5 and the pattern ink layer 6 was 60% by mass of the polyurethane resin and 40% by mass of the nitrocellulose resin with respect to the total mass of each of the layers 5 and 6. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 3)
In Example 3, the inorganic particles 9 (alumina) of the first surface protective layer 7 were omitted. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Example 4)
In Example 4, the inorganic particles 10 (silica) of the second surface protective layer 8 were omitted. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 5)
In Example 5, the average particle size of the inorganic particles 9 (alumina) of the first surface protective layer 7 was set to 5 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Example 6)
In Example 6, the average particle size of the inorganic particles 9 (alumina) of the first surface protective layer 7 was set to 30 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 7)
In Example 7, the average particle size of the inorganic particles 9 (alumina) of the first surface protective layer 7 was set to 3 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Example 8)
In Example 8, the average particle size of the inorganic particles 9 (alumina) of the first surface protective layer 7 was set to 32 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 9)
In Example 9, the average particle size of the inorganic particles 10 (silica) of the second surface protective layer 8 was set to 1 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Example 10)
In Example 10, the average particle size of the inorganic particles 10 (silica) of the second surface protective layer 8 was set to 10 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 11)
In Example 11, the average particle size of the inorganic particles 10 (silica) of the second surface protective layer 8 was set to 0.5 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Example 12)
In Example 12, the average particle size of the inorganic particles 10 (silica) of the second surface protective layer 8 was set to 12 μm. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Comparative Example 1)
In Comparative Example 1, both the inorganic particles 9 (alumina) of the first surface protective layer 7 and the inorganic particles 10 (silica) of the second surface protective layer 8 were omitted. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.
(Comparative Example 2)
In Comparative Example 2, the binder resin of the printing ink of the solid ink layer 5 and the pattern ink layer 6 was a mixed resin containing a polyurethane resin and an alkyd resin. The binder resin was 80% by mass of polyurethane resin and 20% by mass of alkyd resin with respect to the total mass of each of the layers 5 and 6. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Example 1.

(Comparative Example 3)
In Comparative Example 3, the resin constituting the first surface protective layer 7 and the second surface protective layer 8 was an ultraviolet curable resin. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Comparative Example 2.
(Comparative Example 4)
In Comparative Example 4, the resin constituting the first surface protective layer 7 and the second surface protective layer 8 was an electron beam curable resin. Other than that, decorative paper 1 was prepared using the same materials and procedures as in Comparative Example 2.

(Performance evaluation)
The following performance evaluations were performed on the decorative papers 1 of Examples 1 to 12 and Comparative Examples 1 to 4.
(Processing aptitude evaluation)
In the processing suitability evaluation, a V-cut test was performed. In the V-cut test, first, the decorative paper 1 is laminated on MDF (medium density fiberboard) having a thickness of 3 mm using an adhesive (manufactured by Japan Coating, BA-10, BA-11B, coating amount 7 g / scale). After forming the decorative board, the formed decorative board was allowed to stand for 24 hours. The scale angle is an area of 303 mm in length × 303 mm in width. Subsequently, a V-groove portion was formed in the MDF of the decorative board, and the decorative board having the V-groove portion formed was allowed to stand at an ambient temperature of 5 ° C. for 4 hours. Subsequently, the decorative plate was bent at the V-groove portion by hand bending, and the 90 ° portion (corner portion) of the bent portion was visually observed. When cracks were visually observed, the place where the cracks were observed (decorative paper 1 surface, cross section) was observed with an electron microscope in order to confirm in detail how far the cracks were. Then, when it is judged that there is no significant crack, it is judged as a pass "○", when it is judged that there is a crack in a part of the corner part, it is regarded as a fail "△", and when it is judged that there is a crack in the entire corner part. Was rejected as "x".

(Abrasion resistance evaluation)
In the wear resistance evaluation, two soft wear wheels were attached to the test device and rotated 500 times on the decorative paper 1 in accordance with the JAS plywood wear C test. Then, the case where the pattern ink layer 6 did not remove the pattern was evaluated as "○", and the case where the pattern ink layer 6 did not remove the pattern was evaluated as "x".
(Scratch resistance evaluation)
In the scratch resistance evaluation, a pencil hardness test was performed. In the pencil hardness test, various pencils were attached to the test device and scratched twice on the decorative paper 1 at a load of 750 g and a 45 ° angle in accordance with JIS K 5600. Then, the hardness of the pencil when the decorative paper 1 was damaged was investigated.

(Evaluation results)
The evaluation results are shown in Table 1 below.

(Evaluation results)
As shown in Table 1, the decorative papers 1 of Examples 1 to 12 passed "○" in "processability" and "wear resistance".
On the other hand, in the decorative papers 1 of Comparative Examples 1 to 4, either "processability" or "wear resistance" was rejected as "Δ" or "x". Specifically, in Comparative Example 1, since the first surface protective layer 7 and the second surface protective layer 8 did not contain the inorganic particles 9 and 10, the "wear resistance" was rejected as "x". Further, in Comparative Example 2, since the resin constituting the solid ink layer 5 and the pattern ink layer 6 was a resin harder than the mixed resin containing the polyurethane resin and the nitrocellulose resin, the “processability” was rejected as “Δ”. became. Further, in Comparative Examples 3 and 4, since the resins constituting the first surface protective layer 7 and the second surface protective layer 8 were harder than the thermosetting resin containing the acrylic polyol and the isocyanate compound, the "processability" was improved. The "x" was rejected.

Therefore, the decorative paper 1 of Examples 1 to 12, that is, the ink layer 3 contains a mixed resin of a polyurethane resin and a nitrocellulose resin, and the surface protective layer 4 contains a thermosetting resin containing an acrylic polyol and an isocyanate compound, and inorganic particles (9). And at least one of 10), according to the decorative paper 1 which does not satisfy the condition, unlike the decorative paper 1 (the decorative paper 1 of Comparative Examples 1 to 4), the processing suitability and the abrasion resistance are excellent. It was confirmed that the decorative paper 1 could be obtained.
Further, according to the decorative paper 1 of Examples 3 and 7, that is, the decorative paper 1 that does not satisfy the condition that the first surface protective layer 7 contains alumina having an average particle size of 5 μm or more and 30 μm or less, the scratch resistance is “1”. It was confirmed that it was lower than "3H".

In addition, the condition that the decorative paper 1 of Examples 1, 5, 6, 9, and 10, that is, the first surface protective layer 7 contains alumina having an average particle size of 5 μm or more and 30 μm or less is satisfied, and the second surface protection is performed. According to the decorative paper 1 that satisfies the condition that the layer 8 contains silica having an average particle size of 1 μm or more and 10 μm or less, the decorative paper 1 that does not satisfy the condition (the cosmetics of Examples 3, 4, 7, 8, 11, and 12). It was confirmed that, unlike the paper 1), the decorative paper 1 having a scratch resistance of "3H" or more can be obtained.

1 ... decorative paper, 2 ... paper base material, 3 ... ink layer, 4 ... surface protective layer, 5 ... solid ink layer, 6 ... pattern ink layer, 7 ... first surface protective layer, 8 ... second surface protective layer, 9 ... inorganic particles, 10 ... inorganic particles

Claims (4)

An ink layer and a surface protective layer are provided in this order on one surface side of the paper substrate.
The ink layer contains a mixed resin of polyurethane resin and nitrocellulose resin, and contains
The surface protective layer is a decorative paper containing a thermosetting resin containing an acrylic polyol and an isocyanate compound and inorganic particles. The surface protective layer includes a first surface protective layer and a second surface protective layer provided on the surface side of the first surface protective layer opposite to the surface facing the ink layer.
The decorative paper according to claim 1, wherein the inorganic particles contained in the first surface protective layer are alumina having an average particle size of 5 μm or more and 30 μm or less. The decorative paper according to claim 2, wherein the inorganic particles contained in the second surface protective layer are silica having an average particle size of 1 μm or more and 10 μm or less. The invention according to any one of claims 1 to 3, wherein the ink layer includes a solid ink layer and a pattern ink layer provided on the surface side of the solid ink layer facing the surface protective layer. Decorative paper.

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