JP6645025B2 - Decorative sheet and decorative board - Google Patents

Description

  The present invention relates to a decorative sheet and a decorative plate.

  2. Description of the Related Art Conventionally, a decorative sheet using an olefin resin having excellent weather resistance for a base material layer has been used for an exterior member such as an entrance door, the frame material, and a window frame (see Patent Document 1).

JP 2013-22836 A

However, the olefin-based resin is excellent in weather resistance, but has a heat storage effect of storing heat of infrared light included in sunlight. Therefore, in the decorative sheet using the olefin-based resin for the base layer, a temperature difference occurs between the front surface and the back surface to which sunlight is applied, and the thermal expansion amount of the front surface is larger than the thermal expansion amount of the back surface due to the temperature difference. And warping may occur.
The present invention focuses on the above points, and an object of the present invention is to provide a decorative sheet and a decorative sheet which are excellent in weather resistance and can suppress occurrence of warpage due to sunlight.

In order to solve the above problems, a decorative sheet according to one embodiment of the present invention is configured such that a pattern printing layer formed by printing and an overlay film layer are laminated in this order on one surface side of a colored base layer. The colored base layer is made of a polyolefin resin, and at least the surface side of the overlay film layer is made of an acrylic urethane resin containing a triazine ultraviolet absorber, and the solid content of the acrylic urethane resin is 5 g / m ^2. 10 g / m ² or less, and the pattern printing layer has an infrared light transmittance of 80% or more and prints an ink containing titanium oxide as a pigment in a range of more than 0% by mass and 50 % by mass or less. The ink is characterized in that the coloring base material layer contains titanium oxide as a pigment in a range of 23 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the polyolefin resin.

  According to one embodiment of the present invention, since the overlay film layer is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, precipitation of the ultraviolet absorber over time is suppressed, and the effect of ultraviolet shielding performance continues for a long time. And excellent weather resistance. In addition, since the pattern printing layer transmits infrared light, and the colored base layer reflects the transmitted infrared light, the heat storage effect of infrared light can be reduced, and the surface exposed to infrared light (sunlight) can be reduced. The temperature difference between the back surface and the back surface can be reduced, and the occurrence of warpage due to sunlight can be suppressed. Thus, according to one embodiment of the present invention, it is possible to provide a decorative sheet having excellent weather resistance and capable of suppressing occurrence of warpage due to sunlight.

It is sectional drawing which shows the decorative board which concerns on embodiment based on 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 dimension, the ratio of the thickness of each layer, and the like are different from actual ones. Further, the embodiments described below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is as follows. It is not something specific to the thing. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Decorative board 10)
As shown in FIG. 1, the decorative plate 10 of the present embodiment has a pattern printing layer 2, a transparent pressure-sensitive adhesive layer 3, and an overlay film layer 4 laminated in this order on one surface side of a colored base material layer 1. The decorative sheet 20 is formed, and the base material 7 is attached to the other surface side of the colored base material layer 1 via the adhesive layer 6. The decorative board 10 of the present embodiment is particularly suitable for exterior uses such as entrance doors, roofs, outer walls, and louvers.

(Colored base material layer 1)
The coloring base material layer 1 is a sheet-like layer made of a polyolefin-based resin. As described above, by using the polyolefin-based resin, unlike the case of using the fluorine-based resin, no hydrogen fluoride gas is generated even when the decorative sheet 20 is incinerated. As the polyolefin resin, for example, any one of a polypropylene resin such as a homopolypropylene resin and a random polypropylene resin, and a polyethylene resin, or a modified resin thereof can be used. In particular, in consideration of the surface hardness and heat resistance, a polypropylene-based resin is preferable. In addition, an ultraviolet absorber (benzotriazole-based, triazine-based, benzophenone-based, etc.) may be added to the colored base material layer 1 in consideration of weather resistance. The amount of addition may be in accordance with the desired weather resistance, but is 0.1% to 10%, preferably 1% to 5% based on the resin solid content. Among ultraviolet absorbers, benzotriazoles include 2- (2-hydroxy-5-t-butylphenyl) -2H-benzotriazole, 2- (5-methyl-2-hydroxyphenyl) benzotriazole, and 2- [ 2-hydroxy-3,5-bis (α, α-dimethylbenzyl) phenyl] -2H-benzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) benzotriazole, 2- (3 -T-butyl-5-methyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3,5-di-t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole, 2- (3 , 5-Di-t-amyl-2-hydroxyphenyl) benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) benzo Riazor like, or mixtures thereof, modified products, polymers can be used derivatives. Examples of triazines include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol and 2- [4-[(2-hydroxy -3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3 -Tridecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4 dimethylphenyl) -1,3,5-triazine, 2,4-bis (2,4-dimethylphenyl)- For example, 6- (2-hydroxy-4-iso-octyloxyphenyl) -s-triazine, or a mixture, modified product, polymer, or derivative thereof can be used. Further, as the benzophenone type, octabenzone, a modified product, a polymer, and a derivative can be used.

  Further, a hindered amine-based light stabilizer may be added to the colored base material layer 1 in consideration of prevention of deterioration of the polyolefin-based resin itself due to light, heat, water and the like. The number of parts to be added may be set according to the desired weather resistance, and is set to 0.1% by mass to 10% by mass, preferably 1% by mass to 5% by mass with respect to the resin solid content. Examples of the hindered amine light stabilizer include bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl]. Methyl] butylmalonate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-poperidinyl) sebacate, bisdecanediacid (2,2,6,6-tetramethyl-1 (octyloxy) -4-piperidinyl) ester or the like, or a mixture, modified product, polymer, derivative or the like thereof can be used.

The polyolefin-based resin constituting the colored base material layer 1 contains titanium oxide as a pigment (white). Thereby, when the infrared light passes through the picture print layer 2, the colored base material layer 1 reflects the transmitted infrared light. Further, titanium oxide is contained within a range of 23 parts by mass or more and 50 parts by mass or less based on 100 parts by mass of the polyolefin-based resin. Thereby, the infrared light transmitted by the pattern printing layer 2 can be more appropriately reflected, and the colored base material layer 1 can be formed more appropriately.
Note that, in the present embodiment, an example has been described in which titanium oxide (white pigment) as a pigment is included in the resin of the coloring base material layer 1; however, other configurations may be employed. For example, a configuration may be adopted in which a paint using titanium oxide as a pigment is applied to the surface of the colored base material layer 1 on the side of the pattern printing layer 2.
Moreover, it is preferable that the thickness of the base material layer 1 is 30 μm or more and 120 μm or less.

(Picture print layer 2)
The picture printing layer 2 is a layer formed by printing a picture for imparting a design property. As the picture, for example, a picture suitable for a place where the decorative sheet 20 is used, such as a grain of wood, a grain of wood, a tile, and an abstract pattern, can be selected. Further, the printing ink contains, for example, any of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide, or a mixture thereof as a pigment. As a result, the printing ink has a transmittance of infrared light of 80% or more. Therefore, the pattern printing layer 2 transmits the infrared light, and the colored base layer 1 reflects the transmitted infrared light, so that the heat storage effect due to the heat of the infrared light is reduced.

Here, as the method for measuring the transmittance of the printing ink, to a biaxially stretched PET film Thickness 25 [mu] m (Toray Co. Lumirror S50), printed with inks containing dispersed pigment so that the weight 1 g / m ² , Using a spectrophotometer UV3600 manufactured by Shimadzu Corporation to measure the transmittance at 860 measurement points in the wavelength range from 782 nm to 2500 nm at every 2 nm, and divide the total value of the transmittance (% T) at each wavelength by the number of measurement points. A method of using the divided result as the transmittance of infrared light is used . That is, it is calculated by the formula “infrared light transmittance = total value of measured transmittance (% T) at each infrared wavelength (782 nm or more and 2500 nm or less) / number of measurement points (860)”.
The thickness of the pattern printing layer 2 is preferably 5 μm or more and 10 μm or less. Further, it is preferable that the ratio of titanium oxide in the resin constituting the pattern printing layer 2 is 50% or less.

(Transparent adhesive layer 3)
The transparent pressure-sensitive adhesive layer 3 is a sheet-like layer made of a urethane-based adhesive having a polyester-based resin as a main chain. As the urethane-based adhesive having a polyester-based resin as a main chain, for example, a two-pack urethane resin-based adhesive composed of a polyester polyol-based resin and the like and hexamethylene diisocyanate, tolylene diisocyanate, or a mixture thereof can be used.
The urethane-based adhesive constituting the transparent pressure-sensitive adhesive layer 3 includes an antioxidant, an ultraviolet absorber, a light stabilizer, a heat stabilizer, a plasticizer, a lubricant, and an antistatic agent according to the use of the decorative sheet 20. Further, additives such as a flame retardant and a filler may be added.

(Overlay film layer 4)
The overlay film layer 4 is a transparent sheet-like layer made of a predetermined resin. As the predetermined resin, for example, when the coloring base material layer 1 is made of a polypropylene resin (homopolypropylene resin, random polypropylene resin) or a polyethylene resin, the same polypropylene resin (homopolypropylene resin, random polypropylene resin) is used. It is preferable to use a polypropylene resin) or a polyethylene resin. Further, an ultraviolet absorber and a hindered amine light stabilizer may be added to the resin constituting the overlay film layer 4.

A hard resin for protecting the surface of the decorative sheet 20 is coated on the surface of the overlay film layer 4 to form a transparent sheet-like layer (hereinafter, also referred to as “surface protective layer 5”). As the hard resin, for example, an acrylic urethane resin cured by adding isocyanate to acrylic polyol can be used. The coating amount of the solid content of the acrylic urethane resin is 5 g / m ² or more and 10 g / m ² or less, preferably 6 g / m ² or more and 9 g / m ² or less. Thereby, coating property and storage property can be improved.

  As the acrylic polyol, for example, those obtained by polymerizing a plurality of monomers from monomers such as methacrylic acid, methacrylic acid ester, acrylic acid, and acrylic acid ester can be used. For example, methyl methacrylate, butyl methacrylate, methyl acrylate, butyl acrylate and modified products thereof can be used. Here, in the acrylic resin, a plurality of monomers are often polymerized from monomers such as methacrylic acid, methacrylic acid ester, acrylic acid, and acrylic acid ester. Specifically, it includes methyl methacrylate, butyl methacrylate, methyl acrylate, butyl acrylate and modified products thereof. At the stage of the monomer, an acrylic resin having a hydroxyl group can be formed by appropriately adding a hydroxy group-introduced hydroxyethyl methacrylate, hydroxybutyl methacrylate, or the like together with the monomer during polymerization. For example, 4-hydroxybutyl acrylate (HBA), 2-hydroxyethyl acrylate (HEA), 2-hydroxypropyl acrylate (HPA), 2-hydroxyethyl methacrylate (2-HEMA), and the like, modified products, polymers, and derivatives thereof And the like.

  In addition, a triazine-based ultraviolet absorber is added to the acrylic urethane-based resin constituting the surface protective layer 5 in order to perform a weather-resistant formulation. The number of parts added may be in accordance with the desired weather resistance, but is 0.1% to 50%, preferably 1% to 30%, based on the resin solid content. Examples of the triazine-based ultraviolet absorber include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol and 2- [4-[( 2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2 -Hydroxy-3-tridecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4dimethylphenyl) -1,3,5-triazine, 2,4-bis (2,4- Dimethylphenyl) -6- (2-hydroxy-4-iso-octyloxyphenyl) -s-triazine and the like, and mixtures, modified products, polymers and derivatives thereof can be used. In addition, a resin component having a hydroxyl group is suitable as the ultraviolet absorber since crosslinking with a resin component can be expected by crosslinking by adding isocyanate.

Here, a benzotriazole-based or benzophenone-based ultraviolet absorber cannot be selected as an ultraviolet absorber to be added to the surface protective layer 5. Since the triazine-based UV absorber has good compatibility with the acrylic urethane-based resin used for the surface protective layer 5, the precipitation of the UV absorber over time is suppressed, the effect of the UV shielding performance is maintained for a long time, and the weather resistance is improved. Is good.
Further, a hindered amine light stabilizer may be appropriately added to the surface protective layer 5 as another additive in order to prevent deterioration of the resin itself due to light, heat, water, and the like. The number of parts to be added may be in accordance with the desired weather resistance, but is 0.1% by mass to 50% by mass, preferably 1% by mass to 30% by mass with respect to the resin solid content. Examples of the hindered amine light stabilizer include bis (1,2,2,6,6-pentamethyl-4-piperidyl) [[3,5-bis (1,1-dimethylethyl) -4-hydroxyphenyl]. Methyl] butylmalonate, bis (1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, methyl (1,2,2,6,6-pentamethyl-4-poperidinyl) sebacate, bisdecanediacid (2,2,6,6-tetramethyl-1 (octyloxy) -4-piperidinyl) ester and the like, a mixture thereof, a modified product, a polymer, a derivative and the like can be used.

  When an ultraviolet absorber having a hydroxyl group is used, the polymerized acrylic resin has insufficient adhesion with a polyester resin film, particularly, a stretched crystalline high polyester film, and reinforces it. Therefore, it is preferable to add an isocyanate. As the isocyanate compound, an aliphatic compound is preferable in consideration of weather resistance. The aromatic system may be yellowed, and is appropriately selected depending on the intended use. Examples of the aliphatic system include hexamethylene diisocyanate and isophorone diisocyanate.

In the present embodiment, the surface protective layer 5 coated on the surface of the overlay film layer 4 is made of an acrylic urethane resin containing a triazine-based ultraviolet absorber, and the solid applied amount of this acrylic urethane resin is 5 g / m 2. ^Although an example in which the pressure is set to ² or more and 10 g / m ² or less is shown, other configurations can be adopted. For example, the overlay film layer 4 itself may be composed of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, and the solid content of the acrylic urethane-based resin may be 5 g / m ² or more and 10 g / m ² or less. Good.

(Adhesive layer 6)
The pressure-sensitive adhesive layer 6 is a sheet-like layer made of a pressure-sensitive adhesive. The pressure-sensitive adhesive is not particularly limited, and a known pressure-sensitive adhesive can be used. As the adhesive, for example, an acrylic adhesive, a styrene-butadiene rubber-based adhesive, a chloroprene rubber-based adhesive, an olefin rubber-based adhesive, a urethane-based adhesive, and a silicone-based adhesive can be used. In particular, an acrylic pressure-sensitive adhesive is preferable in consideration of weather resistance. An ultraviolet absorber, a light stabilizer, or the like may be added to the adhesive constituting the adhesive layer 6. The thickness of the adhesive layer is about 5 μm or more and about 50 μm or less.

(Base material 7)
The base material 7 is a plate-shaped member made of a metal or wood. As the metal system, for example, aluminum, steel, stainless steel, and composite panel can be used. As a composite panel, for example, there is a panel including a resin layer serving as a core material and metal plates (aluminum, galvalume, stainless steel, etc.) attached to both surfaces of the resin layer. In addition, as the wood system, MDF (medium density fiberboard), plywood, and particle board can be used.

(Effect of this embodiment)
The invention according to the present embodiment has the following effects.
(1) The decorative sheet 20 according to the present embodiment is configured such that a picture printing layer 2 formed by printing and an overlay film layer 4 are laminated in this order on one surface side of the coloring base material layer 1. The colored base material layer 1 is made of a polyolefin-based resin, and at least the surface side of the overlay film layer 4 is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, and the layer thickness is 5 g / solid content. m ² or more and 10 g / m ² or less, the coloring base layer 1 uses titanium oxide as a pigment, and the picture printing layer 2 uses printing ink having an infrared light transmittance of 80% or more.

  According to such a configuration, since the overlay film layer 4 is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, precipitation of the ultraviolet absorber over time is suppressed, and the effect of the ultraviolet shielding performance continues for a long time. And excellent weather resistance. In addition, since the pattern printing layer 2 transmits infrared light and the colored base layer 1 reflects the transmitted infrared light, the heat storage effect of the heat of infrared light can be reduced, and infrared light (sunlight) is reduced. The temperature difference between the front surface and the rear surface can be reduced, and the occurrence of warpage due to sunlight can be suppressed. Thereby, it is possible to provide the decorative sheet 20 having excellent weather resistance and capable of suppressing occurrence of warpage due to sunlight.

(2) In the decorative sheet 20 according to the present embodiment, the printing ink of the pattern printing layer 2 is any one of isoindolinone, disazo, polyazo, diketopyrrolopyrrole, quinacridone, phthalocyanine, and titanium oxide, or a mixture thereof. As a pigment.
According to such a configuration, the coloring base material layer 1 and the picture printing layer 2 can be appropriately formed.

(3) In the decorative sheet 20 according to the present embodiment, the colored base material layer 1 contains titanium oxide in a range of 23 parts by mass to 50 parts by mass with respect to 100 parts by mass of the polyolefin-based resin.
According to such a configuration, the infrared light transmitted by the picture print layer 2 can be more appropriately reflected, and the colored base material layer 1 can be appropriately formed (formed).
(4) The decorative board 10 according to the present embodiment is obtained by bonding the decorative sheet 20 to the base 7.
According to such a configuration, occurrence of warpage of the decorative sheet 20 due to infrared light can be suppressed.

Next, examples based on the present invention will be described.
(Example 1)
In Example 1, 3 parts by mass of a hindered phenolic antioxidant, 1 part by mass of an ultraviolet absorber, 1 part by mass of a hindered amine light stabilizer, 1 part by mass of titanium oxide (pigment, white ) Was used to provide the colored base material layer 1. The thickness of the colored base material layer 1 was 70 μm. Subsequently, hexamethylene diisocyanate and isophorone diisocyanate were added in a ratio of 2: 8 to 100 parts by mass of a mixture of a urethane resin and a vinyl chloride = vinyl acetate copolymer resin in a ratio of 7: 3 on the surface of the colored base material layer 1. A pattern (grain pattern) was printed by gravure printing using an ink containing 3 parts by mass of the mixed curing agent and 3 parts by mass of a pigment composed of isoindolinone, polyazo, and phthalocyanine, and the pattern printing layer 2 was provided. . The transmittance of the printing ink of the picture printing layer 2 for infrared light was 80%.

Subsequently, on the pattern printing layer 2, a mixture obtained by adding 0.5 parts by mass of a benzotriazole-based ultraviolet absorber and 0.3 parts by mass of a hindered amine-based light stabilizer to 100 parts by mass of a random polypropylene-based resin was melted. The overlay film layer 4 was provided by extrusion molding. The thickness (thickness after drying) of the overlay film layer 4 was 70 μm.
Subsequently, on the overlay film layer 4, an acrylic urethane-based resin obtained by adding 10 parts by weight of hexamethylene diisocyanate, 5 parts by weight of a triazine-based ultraviolet absorber and 5 parts by weight of a hindered amine-based light stabilizer to 100 parts by weight of an acrylic polyol. The decorative sheet 20 was provided by coating the surface protective layer 5. The thickness of the surface protective layer 5 was 9 μm. The coating amount of the solid content of the acrylic urethane resin was 5 g / m ² or more and 10 g / m ² or less.

(Example 2)
In Example 2, the colored base material layer 1 was provided using a polyethylene resin instead of the polypropylene resin. Except for this, the decorative sheet 20 of Example 2 was manufactured in the same procedure as in Example 1.
(Comparative example)
In the comparative example, the pigment used for the picture print layer 2 was carbon black. Other than that, the decorative sheet 20 of the comparative example was produced in the same procedure as in Example 1.

(Evaluation judgment)
The following evaluation was performed about the decorative sheet 20 of each of the above Examples and Comparative Examples.
(Weatherability)
Using a metal halide lamp type ultra-accelerated weather resistance tester (manufactured by Daipla Wintes Co., Ltd.), the test was conducted at an illuminance of 650 W / m ² and a black panel temperature of 53 ° C., and then visually checked for cracks or peeling of the appearance. It was confirmed. At that time, the case where there was no crack or peeling in the appearance was evaluated as “good”, and the case where there was cracks or peeling in the external appearance was “bad”.

(Heat insulation)
According to JISK5602, the sunlight reflectance of the coating film was measured. The measurement was performed using a spectrophotometer UV3600 manufactured by Shimadzu Corporation. At that time, the case where the solar reflectance of the coating film was 40% or more was evaluated as “good”, and the case where it was 40% or less was evaluated as “bad”.
(Heat storage)
The decorative sheet 20 was bonded to one side of an uncoated steel plate having a length of 21 cm, a width of 29.7 cm, and a thickness of 0.5 mm using an adhesive. Then, a halogen bulb is placed at a position 15 cm directly above the decorative sheet 20 and the decorative sheet 20 is continuously irradiated with light from the halogen bulb for 120 minutes, and the temperatures of the front and back surfaces of the steel sheet are recorded every minute. And measured the maximum value.

  Table 1 shows the evaluation results.

  From Table 1, at least the surface side (surface protective layer 5) of the overlay film layer 4 is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, the colored base layer 1 is made of titanium oxide as a pigment, In Example 1 and Example 2, which satisfy the scope of the present invention, using ink having a transmittance of infrared light of 80% or more as a printing ink in Example 2, the weather resistance, heat shielding properties, and heat storage properties may be good. Do you get it. That is, it turned out that it is excellent in weather resistance and can suppress generation of warpage due to sunlight.

On the other hand, in the comparative example, the weather resistance was acceptable “O”, but the heat insulation was unacceptable “X”, and the temperature of the steel sheet represented by the heat storage was about 10 ° C. higher than in Examples 1 and 2. It has become high.
In Example 1, at least the surface side (surface protective layer 5) of the overlay film layer 4 is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, and the coloring base material layer 1 is made of titanium oxide as a pigment. When the pattern printing layer 2 was adjusted to be an ink having a transmittance of infrared light of 80% or more as a printing ink within the scope of the present invention, the same effect as in Examples 1 and 2 was obtained. Was.

DESCRIPTION OF SYMBOLS 1 Colored base material layer 2 Picture printing layer 3 Transparent adhesive layer 4 Overlay film layer 5 Surface protection layer 6 Adhesive layer 7 Base material 10 Decorative board 20 Decorative sheet

Claims (3)

On one surface side of the colored base material layer, a pattern printing layer formed by printing, and an overlay film layer are laminated in this order,
The colored base layer is made of a polyolefin resin,
At least the surface side of the overlay film layer is made of an acrylic urethane-based resin containing a triazine-based ultraviolet absorber, and the solid applied amount of the acrylic urethane-based resin is 5 g / m ² or more and 10 g / m ² or less,
The pattern printing layer has a transmittance of infrared light of 80% or more and a printing ink containing an ink containing titanium oxide as a pigment in a range of more than 0% by mass and 50 % by mass or less,
The decorative sheet is characterized in that the colored base material layer contains titanium oxide as a pigment in a range of 23 parts by mass to 50 parts by mass with respect to 100 parts by mass of the polyolefin-based resin. The printing ink, in addition to titanium oxide, isoindolinone, disazo, polyazo, diketopyrrolopyrrole, either Kiinakuridon and phthalocyanine down, or wherein a mixture thereof in claim 1, characterized in that it comprises as a pigment Decorative sheet.   A decorative plate comprising the decorative sheet according to claim 1 and a base material attached thereto.

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