JP2005239858A - Resin composition for decorative sheet, material for surface layer of decorative sheet, and decorative sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a resin composition usable for forming a surface layer having a high surface smoothness and surface glossiness, and enabling a desired color tone to be sufficiently exhibited without damaging conventional basic characteristics as a decorative sheet, on the decorative sheet; and to provide a material for the surface layer of the decorative sheet and the decorative sheet, using the resin composition. <P>SOLUTION: The resin composition for the decorative sheet, usable for forming the surface layer on a design face side of the decorative sheet contains a curable resin and an inorganic filler. The material for the surface layer of the decorative sheet is obtained by applying the resin composition to one or both of the surface of a paper fiber base material and the surface of a curable resin-impregnated paper fiber base material. The decorative sheet is obtained by laminating the material for the surface layer of the decorative sheet on the surface side of a material for the decorative sheet including a material for a core material, and subjecting the laminated product to a hot and pressure forming, and has the surface layer on the design face side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a resin composition for a decorative board, a material for a decorative board surface layer, and a decorative board.

  The decorative board has a hard surface, excellent heat resistance and contamination resistance, has a beautiful appearance in terms of design, and can be selected from abundant colors and patterns, so it can be used for furniture tables, conference tables, and office desks. It is widely used for top plates such as interior materials for houses and office buildings.

Among the decorative boards, for example, a thermosetting resin decorative board such as a melamine resin high-pressure decorative board is formed by sequentially laminating a prepreg in which a paper base is impregnated with a resin varnish in which a thermosetting resin is dissolved in a solvent. Using a press plate such as a plate, it is manufactured by heating and pressing with a flat plate press.
The design of the decorative board is determined by the color tone / pattern of the base material used on the surface side and the surface form of the press plate used at the time of molding.For example, when obtaining a plain white glossy decorative board, In general, white paper made of titanium is used as a base material and it is formed by a mirror-finished press plate. (For example, refer to Patent Document 1).

However, the decorative board obtained in this way has unevenness due to the unevenness of the thickness and basis weight of the surface-side substrate, and is not necessarily sufficient in terms of surface smoothness and surface gloss. It wasn't.
In addition, even if white paper as described above is used for the surface-side base material, it may transmit the color tone of the core layer laminated on the lower layer side of the surface-side base material. In some cases, the color tone is not fully developed.

JP 07-310417 A

  The present invention forms a surface layer of a decorative board having high surface smoothness and surface glossiness and capable of sufficiently expressing an intended color tone without impairing basic characteristics as a conventional decorative board. A decorative resin composition for decorative plates, a decorative plate surface layer material using the same, and a decorative plate are provided.

Such an object is achieved by the following present inventions (1) to (13).
(1) A resin composition for a decorative board, which is a resin composition used for forming a surface layer on the design surface side of a decorative board, and contains a curable resin and an inorganic pigment.
(2) The resin composition for decorative plates according to (1), wherein the curable resin is a melamine resin. (3) The resin composition for decorative plates according to (1) or (2), wherein the inorganic pigment contains titanium dioxide.
(4) The decorative resin composition according to any one of (1) to (3), wherein the inorganic pigment has an average particle diameter of 0.1 to 1 μm.
(5) The said resin composition is a resin composition for decorative plates as described in said (1) thru | or (4) containing 20-100 weight part of said inorganic pigments with respect to 100 weight part of said curable resins.
(6) The resin composition for decorative plates according to any one of (1) to (5), wherein the resin composition further contains a flexibility imparting agent.
(7) The decorative resin composition according to (6), wherein the flexibility imparting agent is a solvent-soluble modified fluororesin.
(8) The resin composition for decorative plates according to (7), wherein the resin composition contains 0.5 to 5 parts by weight of the solvent-soluble modified fluororesin with respect to 100 parts by weight of the curable resin. Stuff.
(9) One side or both sides of the resin composition for decorative plates according to any one of (1) to (8) above, either on the surface of a paper fiber base or on the surface of a curable resin-impregnated paper fiber base A decorative sheet surface layer material characterized by being supported on a surface.
(10) The decorative plate surface layer material described in (9) above is laminated on the surface side of the decorative plate material containing the core layer material, and this is heat-pressed to form a surface on the design surface side. A decorative board comprising a layer.
(11) The decorative sheet according to (10), wherein the surface layer has a thickness of 5 to 200 μm.
(12) The decorative sheet according to (10) or (11), wherein the surface layer has a substantially uniform thickness.
(13) The decorative board according to any one of (10) to (12), wherein the surface layer substantially conceals the color tone of the layer bonded to the surface layer from the design surface side.

The present invention is used for forming a surface layer on the design surface side of a decorative board and contains a curable resin and an inorganic pigment, and a decorative board using the same It is a surface layer material and a decorative board.
By using the resin composition for decorative board of the present invention and forming a surface layer on the design surface side of the decorative board, it has high surface smoothness and surface glossiness and can fully express the intended color tone. A decorative board can be obtained.

Hereinafter, the resin composition for a decorative board, the material for a decorative board surface layer, and the decorative board of the present invention will be described.
The resin composition for decorative plates of the present invention (hereinafter sometimes simply referred to as “resin composition”) is a resin composition used for forming a surface layer on the design surface side of a decorative plate, and is curable. It contains a resin and an inorganic pigment.
The decorative board surface layer material of the present invention comprises the resin composition of the present invention supported on one or both surfaces of a paper fiber substrate surface or a curable resin-impregnated paper fiber substrate surface. It is characterized by becoming.
And the decorative board of the present invention is formed by laminating the decorative board surface layer material of the present invention on the surface side of the decorative board material containing the core material, and heat-pressing it, and the design surface side And a surface layer.
First, the resin composition of the present invention will be described.

  The resin composition of the present invention is characterized by containing a curable resin and an inorganic pigment.

  Although it does not specifically limit as curable resin used for the resin composition of this invention, For example, phenol resin, such as a resol type and a novolak type, bisphenol type epoxy resins, such as a bisphenol A type and a bisphenol F type resin, a novolak type epoxy resin And epoxy resins such as biphenyl type epoxy resins, urea (urea) resins, melamine resins, unsaturated polyester resins, polyurethane resins, sialyl phthalate resins, and silicone resins. These can be used alone or in combination of two or more.

  Among these curable resins, it is preferable to use a melamine resin. The melamine resin is highly transparent and hardly changes color or yellow, so that the color tone expressed by the inorganic pigment is hardly impaired. Moreover, it can be set as a decorative board which is excellent in surface hardness and chemical resistance, and has high surface impact strength.

  In addition, when using the said curable resin, a hardening | curing agent and a hardening accelerator can be used together as needed.

  Although it does not specifically limit as an inorganic pigment used for the resin composition of this invention, As a white pigment, titanium dioxide (titanium white, titanium white), zinc oxide (zinc white), basic lead carbonate (lead white), Examples of colored pigments such as strontium titanate, antimony oxide, and lithopone (mixed crystal of zinc sulfide and barium sulfate) include petals, bitumen, county blue, cobalt blue, and chrome green. These can be used alone or in combination of two or more.

  Among these inorganic pigments, titanium dioxide is preferable as the white pigment. Titanium dioxide has excellent characteristics in whiteness, hiding power, coloring power, etc., and therefore can exhibit these characteristics even when used at a relatively low concentration.

The particle size of the inorganic pigment used in the resin composition of the present invention is not particularly limited, but it is preferable to use one having an average particle size of 0.1 to 1 μm. More preferably, it is 0.1-0.5 micrometer. Thereby, it can be excellent in the smoothness of the surface of a decorative board, and the capability to shield the color tone of the lower layer side of a surface layer.
If the average particle size is smaller than the lower limit, the ability to shield the color tone on the lower layer side of the surface layer may not be sufficient depending on the amount of inorganic pigment used. Moreover, when preparing a resin composition varnish using the resin composition of this invention, a viscosity tends to become high and workability | operativity may fall. On the other hand, when the above upper limit is exceeded, the surface smoothness of the decorative board may be lowered.

  In the resin composition of the present invention, the mixing ratio of the curable resin and the inorganic pigment is not particularly limited, but is preferably 20 to 100 parts by weight with respect to 100 parts by weight of the curable resin. More preferably, it is 40-80 weight part. When the blending ratio of the inorganic pigment is less than the above lower limit value, the ability to shield the color tone on the lower layer side of the surface layer may not be sufficient depending on the thickness of the surface layer formed on the decorative board surface. On the other hand, when the above upper limit is exceeded, the viscosity tends to increase when the resin composition varnish is prepared using the resin composition of the present invention, and workability may be lowered. Moreover, the surface smoothness of a decorative board may fall.

  The resin composition of the present invention preferably contains a flexibility imparting agent in addition to the curable resin and the inorganic pigment. Thereby, since the fluidity | liquidity of a resin composition can be improved at the time of decorative board manufacture, the smoothness of a surface layer can be improved more. Moreover, it can suppress that a crack arises in a surface layer.

  The flexibility-imparting agent used in the resin composition of the present invention is not particularly limited. Examples include phenoxy resin and fluororesin. These can be used alone or in combination of two or more.

  Among these flexibility imparting agents, a fluororesin is preferable, and a solvent-soluble modified fluororesin is more preferable. Thereby, the said effect can be expressed, without significantly reducing the hardness of the decorative board surface.

In the resin composition of the present invention, the blending amount of the flexibility imparting agent is not particularly limited because it varies depending on the type of the flexibility imparting agent to be used. For example, a solvent-soluble modified fluororesin is used as the flexibility imparting agent. Is preferably 0.5 to 5 parts by weight with respect to 100 parts by weight of the curable resin. More preferably, it is 0.5 to 2 parts by weight.
If the amount of the solvent-soluble modified fluororesin is less than the lower limit, the above effects may not be sufficiently exhibited. On the other hand, if the amount exceeds the above upper limit, the surface hardness of the decorative board may decrease.

  As such a solvent-soluble fluororesin, for example, “New Garmet” manufactured by Towpe Co., Ltd. can be used.

In addition, an organic pigment can be used for the resin composition of the present invention. As the organic pigment, any insoluble or soluble one in the solvent used when preparing the resin composition varnish can be used.
Further, in the resin composition of the present invention, a coupling agent, a surfactant or the like is used in order to improve the wettability between the curable resin and the inorganic pigment and the dispersibility of the inorganic pigment in the resin composition varnish. be able to.

Next, the decorative board surface layer material of the present invention will be described.
The decorative board surface layer material of the present invention comprises the above-mentioned resin composition of the present invention carried on one or both sides of the paper fiber substrate surface or the curable resin-impregnated paper fiber substrate surface. It is.

Although it does not specifically limit as a paper fiber base material used here, For example, the paper-making paper etc. which made the pigment (titanium white etc.) into cellulose, etc. can be used. In particular, it is preferable to use a papermaking paper obtained by making a pigment into cellulose. Thereby, the ability to shield the color tone on the lower layer side of the surface layer can be further improved.
The basis weight of the paper fiber substrate is not particularly limited, but those having a basis weight of 50 to 200 g / m ² can be usually used.

The curable resin-impregnated paper fiber base material is not particularly limited. For example, the paper fiber base material impregnated with a resin varnish mainly composed of a curable resin, or impregnated with a resin varnish. Then, what advanced reaction of curable resin to B stage etc. can be used.
As the curable resin, those used in the resin composition of the present invention can be suitably used.

Although it does not specifically limit as a method to carry | support the resin composition of this invention on either the paper fiber base-material surface or the curable resin impregnation paper fiber base-material surface, For example, using the resin composition of this invention , A method of preparing a resin composition varnish in which the resin composition varnish is dissolved or dispersed in water or a solvent, and immersing the paper fiber substrate or curable resin-impregnated paper fiber substrate in the resin composition varnish; Or the method of coating on the single side | surface or both surfaces of a curable resin impregnation paper fiber base material etc. are mentioned.
Among these, according to the method of coating the resin composition varnish on one side or both sides of the curable resin-impregnated paper fiber base material, the decorative board surface layer material can be produced by a simple method. And, when producing the decorative board surface layer material, it is possible to prevent contamination between the resin composition varnish using the resin composition of the present invention and the resin varnish used for producing the curable resin-impregnated paper fiber base material. it can.

The method for preparing the resin composition varnish using the resin composition of the present invention is not particularly limited, but a solvent that dissolves or disperses a predetermined amount of a curable resin, an inorganic pigment, a flexibility imparting agent, and the like. And mixed with stirring.
Although it does not specifically limit as a method of stirring and mixing here, For example, besides a stirrer equipped with a normal stirrer blade, a disperser, a homomixer, as a high-speed stirrer, for example, Claremix (M Technique Co., Ltd.), T.A. K. Filmix (made by Special Machine Industry Co., Ltd.) can be used. Among these, it is preferable to use the high-speed stirring device. Thereby, the dispersibility of an inorganic pigment can be improved and the uniform mixing property of curable resin and an inorganic pigment can be improved. Also, even when a flexibility imparting agent that is soluble in a solvent that does not have an affinity for a solvent that dissolves the curable resin is used, it should be finely dispersed and uniformly dispersed in the resin composition varnish. Can do.

Next, the decorative board of the present invention will be described.
The decorative board according to the present invention is obtained by laminating a decorative board surface layer material on the surface side of a decorative board material including a core layer material, and heat-pressing it, and having a surface layer on the design surface side. It is.

The decorative board of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an example of the form of the decorative board of the present invention.
The decorative board 1 includes a core material layer 11 and a surface layer 12 a laminated on the core material layer 11. Here, the core material layer 11 is formed from the material for the core material layer, and the surface layer 12a is formed from the material for the surface layer. In the form of FIG. 1, the surface layer 12a uses the resin composition of the present invention carried on one side of a curable resin-impregnated paper fiber base material, whereby the surface layer 13 is formed.
Moreover, FIG. 2 is an example of another form of the decorative board of this invention.
The decorative board 2 includes a core material layer 11 and a surface layer 12b laminated on the core material layer 11. Here, the core material layer 11 is formed from the material for the core material layer, and the surface layer 12b is formed from the material for the surface layer. In the form of FIG. 2, the surface layer 12b uses the resin composition of the present invention supported on both surfaces of a curable resin-impregnated paper fiber base material, whereby the surface layer 13 and the same resin as the surface layer 13 are used. A shielding layer 14 made of the composition is formed.
In addition, in the decorative board of this invention, it can also have a back layer formed from a back layer material on the surface of the core material layer 11 on the opposite side to the surface layer 12.

In the decorative board of the present invention, the base material used for the core material for forming the core material layer is not particularly limited. For example, natural organic fibers, inorganic fibers such as glass, synthetic fibers such as polyester, etc. Alternatively, paper, woven fabric, non-woven fabric, etc. used in plural kinds by blending and blending can be used.
Among these, kraft paper having a basis weight of 50 to 250 g / m ² can be usually used for a high-pressure melamine decorative board. Moreover, as a flame-retardant or non-flammable decorative board, a glass nonwoven fabric or glass woven fabric having a basis weight of 30 to 200 g / m ² can be used.
The core layer material used for the decorative board of the present invention is obtained by impregnating or carrying a curable resin, or a resin varnish mainly composed of a curable resin and an inorganic filler, on the base material. What advanced reaction to B stage can be used.

  Thus, the decorative board of the present invention can be obtained by laminating the core layer material, the surface layer material, and the like in a predetermined order, and heat-pressing them using a flat plate press or the like. Although it does not specifically limit as conditions of heat-press molding, For example, it can carry out by the temperature of 130-170 degreeC, the pressure of 4-10 MPa, and time 60-120 minutes.

In the decorative board of the present invention, the thickness of the surface layer formed on the surface is preferably 5 to 200 μm. More preferably, it is 5-100 micrometers. Thereby, it can be set as the decorative board which is excellent in surface smoothness and has high surface glossiness.
If the thickness of the surface layer is less than the above lower limit, the surface smoothness and surface glossiness may not be sufficiently improved. Further, depending on the blending amount of the inorganic pigment in the surface layer and the configuration of the decorative board, the surface layer may not have sufficient ability to shield the color tone on the lower layer side. On the other hand, exceeding the upper limit is basically no problem, but depending on the composition of the resin composition, the surface layer may easily crack. Moreover, the manufacturing cost of a decorative board becomes expensive.
In addition, the thickness of this surface layer can be measured by observing the cross section of the obtained decorative board with a microscope, for example.

This surface layer preferably has a substantially uniform thickness at any portion in the plane direction of the decorative board. Thereby, in addition to the above effect, the effect of shielding the lower color tone by the surface layer becomes uniform, and the uniformity of the design of the decorative board, that is, the uniformity of the color tone imparted by the pigment can be improved. it can.
And it is preferable that this surface layer shields the color tone which the layer joined to the surface layer, ie, the layer below the surface layer, has. Thereby, the designability of a decorative board can be formed with the color tone which a surface layer has.

  As described above, the decorative board of the present invention shields the color tone of the layer below the surface layer with the inorganic pigment blended in the resin composition forming the surface layer, and the color tone of the resin composition. Can be expressed as is. And by forming a surface layer on the surface of the decorative board, it has high surface smoothness and surface glossiness, and due to these effects, it has a design design with high brightness that has never existed in the past. It can be suitably used for office supplies, building interior materials, and the like.

  Hereinafter, the present invention will be described in detail with reference to examples.

1. Example 1
(1) Preparation of resin composition varnish The reaction molar ratio (F / M) of melamine (M) and formaldehyde (F) was 1.7, and this was mixed at a reaction temperature of 95 ° C. with water. Was reacted until it reached 16 ml / 5 ml to obtain a melamine resin solution. The melamine resin solid content in this melamine resin solution was 50% by weight, and the ratio of the solvent component was methanol: water = 5: 95.
With respect to 100 parts by weight of the melamine resin solution, 0.4 part by weight of Nitto Riken Kogyo Co., Ltd. “Catanit A” as a curing accelerator, and titanium dioxide A (Ishihara Sangyo Co., Ltd., “Titanium R-820” as an inorganic pigment. 30 parts by weight of an average particle size of 0.26 μm) As a flexibility imparting agent, a solvent-soluble modified fluororesin (“New Garmet # 2300” manufactured by Tope Co., Ltd., solid content 55% by weight, xylene solvent-soluble product ) Was mixed with 1 part by weight of the main agent and 0.2 part by weight of the curing agent.
This was stirred for 3 minutes at a rotational speed of 15000 rpm using a high-speed stirring device (manufactured by M Technique Co., Ltd. “CLEAMIX”) to obtain a resin composition varnish.

(2) Production of Surface Layer Material A melamine resin varnish was prepared by blending 1.0 part by weight of “Catanit A” manufactured by Nitto Riken Kogyo Co., Ltd. as a curing accelerator with respect to 100 parts by weight of the melamine resin solution. This was impregnated into white titanium paper having a weight of 150 g / m ² and then dried with a hot air dryer to obtain a melamine resin-impregnated paper fiber base material having a weight of 310 g / m ² and a volatile content of 8% by weight.
The resin composition varnish obtained above was applied to one side of the curable resin-impregnated paper fiber base material by applying 100 g / m ^{2 in} terms of solid content using a comma coater device. This was dried with a hot air drying device to obtain a surface layer material having a surface area of 410 g / m ² .

(3) Manufacture of material for core material layer It mix | blends so that the reaction molar ratio (F / P) of phenol (P) and formaldehyde (F) may be set to 1.5, and this is made to react at 95 degreeC for 210 minutes. A phenolic resin varnish was obtained. The varnish was immersed in a kraft paper having a basis weight of 180 g / m ² and then impregnated, and then dried with a hot air drying apparatus, and the core layer was adjusted to a basis weight of 280 g / m ² and a volatile content of 5 to 7% by weight. Material was obtained.

(4) Manufacture of decorative board 7 sheets of the core layer material obtained above are laminated, and one surface layer material obtained above is laminated on the surface coated with the resin composition varnish. And laminated. This is sandwiched between mirror-finished press plates, and heated and pressed at 160 ° C. and 10 MPa for 60 minutes using a flat plate press machine. The size is 1 m × 1 m, the thickness is about 1.5 mm, and the entire surface of the decorative plate surface. A melamine resin decorative board having a surface layer having a thickness of 43 μm was obtained.

2. Example 2
(1) Preparation of resin composition varnish A resin composition varnish was obtained in the same manner as in Example 1 (1) except that the amount of titanium dioxide A was 20 parts by weight with respect to 100 parts by weight of the melamine resin solution. It was.

(2) Production of surface layer material In the same manner as in Example 1 (2), a curable resin-impregnated paper fiber substrate was obtained.
The resin composition varnish obtained above was applied to one side of this curable resin-impregnated paper fiber base material by applying 130 g / m ^{2 in} terms of solid content using a comma coater device. This was dried with a hot air drying device to obtain a surface layer material having a surface area of 440 g / m ² .

(3) Manufacture of material for core material layer It carried out similarly to Example 1 (3) and obtained the material for core material layers.

(4) Manufacture of decorative board 7 sheets of the core layer material obtained above are laminated, and one surface layer material obtained above is laminated on the surface coated with the resin composition varnish. And laminated. A melamine resin decorative board in which a surface layer having a size of 1 m × 1 m, a thickness of about 1.5 mm, and a thickness of 62 μm is formed on the entire surface of the decorative board is formed by heating and pressing under the same conditions as in Example 1. Obtained.

3. Example 3
(1) Preparation of resin composition varnish In place of titanium dioxide A, titanium dioxide B (manufactured by Ishihara Sangyo Co., Ltd., “Titanium R-680”, average particle size 0.21 μm) was used, and the blended amount was determined as a melamine resin solution. A resin composition varnish was obtained in the same manner as in Example 1 (1) except that the amount was 40 parts by weight with respect to 100 parts by weight.

(2) Production of surface layer material In the same manner as in Example 1 (2), a curable resin-impregnated paper fiber substrate was obtained.
The resin composition varnish obtained above was applied to one side of the curable resin-impregnated paper fiber base material by 55 g / m ^{2 in} terms of solid content using a comma coater. This was dried with a hot air dryer to obtain a surface layer material having a surface area of 365 g / m ² .

(3) Manufacture of material for core material layer It carried out similarly to Example 1 (3) and obtained the material for core material layers.

(4) Manufacture of decorative board 7 sheets of the core layer material obtained above are laminated, and one surface layer material obtained above is laminated on the surface coated with the resin composition varnish. And laminated. This was heated and pressed under the same conditions as in Example 1 to obtain a melamine resin decorative board having a surface layer of 1 m × 1 m, a thickness of about 1.5 mm, and a surface layer of 22 μm on the entire surface of the decorative board. Obtained.

4). Comparative Example 1
(1) Production of surface layer material In the same manner as in Example 1 (2), a curable resin-impregnated paper fiber substrate was obtained. This was used as a surface layer material.

(2) Manufacture of core material layer material It carried out similarly to Example 1 (3) and obtained the material for core material layers.

(3) Manufacture of decorative board 7 sheets of the core layer material obtained above are laminated, and one surface layer material obtained above is laminated on the surface coated with the resin composition varnish. And laminated. This was heated and pressed under the same conditions as in Example 1 to obtain a melamine resin decorative board having a size of 1 m × 1 m and a thickness of about 1.5 mm.

  Table 1 shows the composition of the resin compositions in Examples and Comparative Examples and the characteristics of the resulting decorative board.

5). Evaluation method of decorative plate (1) Thickness of surface layer: The decorative plate (1 m × 1 m) obtained in the example was cut into 25 samples of 200 mm × 200 mm in size, and the substantially central portion of each sample in the planar direction The cross section of was observed with a microscope, and the thickness of 25 locations was measured. From this, the average value of thickness and R (maximum value-minimum value) were calculated.
(2) Surface glossiness: Image sharpness was measured using an image sharpness gloss meter “DGM-30” manufactured by Murakami Color Research Laboratory. The measurement conditions were a light incident angle of 30 degrees and a light receiving angle of 30 degrees. This measured value indicates the ratio of the measured light amount within a range of ± 0.3 degrees with respect to the axis with respect to the reflected light amount (100) of the regular reflection axis, and the surface smoothness is determined by the diffusivity of the reflected light. It is an index indicating surface glossiness.
(3) Whiteness: The whiteness of the decorative board surface was visually observed, and the whiteness of the decorative board obtained in the comparative example was marked as “◯” based on the decorative board.
(4) Surface hardness: Based on JIS K 6902, the scratch hardness of the decorative board was measured using a diamond needle. The test conditions were shown by the number of grams immediately before the scratches were confirmed, starting with 10 g of the load applied to the diamond needle, increasing this load by 10 g.
(5) Abrasion resistance: In accordance with JIS K 6902, the weight loss (g) of the decorative board when the decorative board surface was worn using a Taber type ablazer was measured. The measurement conditions were that the load exerted on the contact surface of the decorative plate by the wear wheel was 500 g, and the measurement was performed at the time when the wear wheel was rotated 200 times and 500 times.

  Examples 1 to 3 are decorative boards in which a surface layer is formed by using the resin composition of the present invention, which contains a curable resin and an inorganic pigment. Compared with the decorative board, a decorative board with excellent surface smoothness and surface gloss and whiteness can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, the resin composition for decorative boards, the material for decorative board surface layers, and a decorative board which can provide the decorative board which is excellent in surface smoothness, has high surface glossiness, and has a vivid color tone can be obtained.
The decorative board of the present invention can be suitably used for, for example, furniture, office supplies, architectural interior materials, and the like.

Side sectional view showing an example of the decorative board of the present invention Side sectional view showing an example of the decorative board of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Decorative plate 2 Decorative plate 11 Core material layer 12 Surface layer 13 Surface layer 14 Shielding layer

Claims (13)

A resin composition for a decorative board, which is a resin composition used for forming a surface layer on the design surface side of a decorative board, and contains a curable resin and an inorganic pigment. The resin composition for decorative plates according to claim 1, wherein the curable resin is a melamine resin. The resin composition for a decorative board according to claim 1 or 2, wherein the inorganic pigment contains titanium dioxide. The resin composition for a decorative board according to any one of claims 1 to 3, wherein the inorganic pigment has an average particle diameter of 0.1 to 1 µm. The decorative resin composition according to claim 1, wherein the resin composition contains 20 to 100 parts by weight of the inorganic pigment with respect to 100 parts by weight of the curable resin. The resin composition for a decorative board according to any one of claims 1 to 5, wherein the resin composition further contains a flexibility imparting agent. The decorative resin composition according to claim 6, wherein the flexibility-imparting agent is a solvent-soluble modified fluororesin. The resin composition for decorative plates according to claim 7, wherein the resin composition contains 0.5 to 5 parts by weight of the solvent-soluble modified fluororesin with respect to 100 parts by weight of the curable resin. The resin composition for decorative boards according to any one of claims 1 to 8 is carried on one side or both sides of either the paper fiber base surface or the curable resin-impregnated paper fiber base surface. A material for the decorative layer surface layer. The decorative board surface layer material according to claim 9 is laminated on the surface side of the decorative board material including the core layer material, and is heat-pressed to have a surface layer on the design surface side. A decorative board characterized by The decorative board according to claim 10, wherein the surface layer has a thickness of 5 to 200 μm. The decorative sheet according to claim 10 or 11, wherein the surface layer has a substantially uniform thickness. The decorative board according to any one of claims 10 to 12, wherein the surface layer substantially conceals the color tone of the layer bonded to the surface layer from the design surface side.

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