JP6819419B2 - A decorative sheet and a decorative member provided with the decorative sheet - Google Patents

Description

The present invention relates to a decorative sheet and a decorative member provided with the decorative sheet.

Interior / exterior materials for buildings such as walls, ceilings, and floors, window frames, doors, handrails, skirting boards, surrounding edges, fittings such as moldings, kitchens, furniture or light electric appliances, cabinet surface veneers for OA equipment, etc. As the interior / exterior member of a vehicle, a decorative member is generally used in which a metal member such as a steel plate, a resin member, or a wooden member is used as an adherend, and a decorative sheet is attached thereto.

In recent years, there has been an increasing demand for dark-colored decorative sheets or decorative members. As the dark-colored decorative sheet or decorative member, the decorative sheet or decorative member contains carbon black as a black pigment in any of the layers (for example, the adherend, the base material, the decorative layer) constituting the decorative sheet or the decorative member. It has been known. However, when the decorative sheet or decorative member containing carbon black is used in an environment exposed to direct sunlight, the carbon black absorbs heat (infrared rays), causing a temperature difference between the layers constituting the decorative sheet or decorative member. , There is a problem that the decorative sheet or the decorative member is warped. There is also a problem that the heat absorbed by carbon black propagates inside the building and the temperature inside the building rises.

Therefore, a decorative sheet or a decorative member that does not contain carbon black as a black pigment has been studied. For example, Patent Document 1 (Japanese Unexamined Patent Publication No. 2016-168713) provides a decorative sheet that reproduces black by mixing an isoindolinone pigment (yellow), a diketopyrrolopyrrole pigment (red), and a phthalocyanine pigment (blue). Has been described. Further, in Patent Document 2 (Japanese Unexamined Patent Publication No. 2014-43066), a decorative sheet having improved heat-shielding performance by using an azomethine-azo pigment having high infrared transmittance (low infrared absorption) as a black pigment. Is described. Further, Patent Document 3 (Japanese Unexamined Patent Publication No. 2007-168176) describes a laminate whose heat storage property is reduced by using an inorganic pigment having infrared reflection characteristics.

Japanese Unexamined Patent Publication No. 2016-168713 JP-A-2014-043066 JP-A-2007-168176

However, in Patent Document 1, the three types of pigments required to reproduce black color have infrared absorption. When the content of the three kinds of pigments is large, the black color exhibited by the decorative sheet becomes sufficient, but the infrared absorption of the decorative sheet becomes high. When the content of the three types of pigments is low, the infrared absorption of the decorative sheet is low, but the black color exhibited by the decorative sheet is insufficient. Further, in Patent Document 1, the three types of pigments required to reproduce black color have different weather resistance. Therefore, as the period of use of the decorative sheet becomes longer, the color of the pigment having weak weather resistance fades, and the color produced by the mixing of the three types of pigments changes. Therefore, it is difficult to realize a decorative sheet or a decorative member that continuously exhibits a dark color and exhibits heat-shielding performance according to Patent Document 1.

Further, since the azomethine azo pigment used in Patent Document 2 is an organic pigment, its weather resistance is lower than that of an inorganic pigment, and discoloration is likely to occur. Therefore, it is difficult to realize a decorative sheet or a decorative member that continuously exhibits a dark color and exhibits heat shielding performance according to Patent Document 2.

Further, the inorganic pigment used in Patent Document 3 exhibits sufficient infrared reflection characteristics if it is a high-brightness product such as white, but it has sufficient infrared reflection characteristics if it is a dark-colored low-brightness product such as black. Does not show. Therefore, it is difficult to realize a decorative sheet or a decorative member that continuously exhibits a dark color and exhibits heat-shielding performance according to Patent Document 3.

Therefore, it is an object of the present invention to provide a decorative sheet and a decorative member that continuously exhibit black color and exhibit heat shielding performance.

In order to solve the above problems, the present invention provides the following decorative sheets and decorative members.
[1] It has a first main surface and a second main surface located on the opposite side of the first main surface.
A decorative sheet comprising a base sheet, a first dark color layer, and a second dark color layer in order from the second main surface side.
The first dark color layer contains an iron oxide pigment and a blue pigment,
The second dark layer contains a black pigment and
L * a * b * color system L * , a * and b * measured by irradiating the first main surface of the decorative sheet with light are designated as L 1 * , a 1 * and b 1 * , respectively. After performing a weather resistance test on the decorative sheet under the following conditions, the first main surface of the decorative sheet after the weather resistance test is irradiated with light and measured. L * a * b * Color system L *, a * and b *, respectively L 2 *, when the a 2 * and b 2 *, L 1 * is 30 or less, a 1 * is -1.5 to 1.5, b 1 * is - 2.0 or more and 1.3 or less, and ΔE = ((L 2 * −L 1 * ) 2 + (a 2 * −a 1 * ) 2 + (b 2 * −b 1 * ) 2 ) 1/2 The color difference ΔE defined by is less than 4,
The decorative sheet having an average spectral reflectance of 35% or more in a wavelength range of 781 nm or more and 2500 nm or less, which is measured by irradiating the first main surface of the decorative sheet with light having a wavelength range of 781 nm or more and 2500 nm or less.
[Conditions for weather resistance test]
Weather resistance tester: Suga Test Instruments Co., Ltd. Sunshine Weather Ometer S300
Test time: 4000 hours Discharge voltage: 50 ± 2V
Discharge current: 60 ± 2A
Glass filter: A type Black panel temperature: 63 ± 3 ° C
Water injection conditions:
Pressure: 0.08 to 0.13 MPa
Water volume: 2100 + 100 mL / min Injection time: 18 minutes / 120 minutes Irradiation Water quality: pH 6.8
Water temperature: 16 ± 5 ° C
Relative humidity: 90 ± 5% (during condensation), 50 ± 5% (during irradiation)
Sample surface irradiance: 255 W / m 2 (continuous irradiation at 300 to 400 nm)
1 cycle: 120 minutes (102 minutes of irradiation followed by 18 minutes of irradiation and injection)
Number of cycles: 2000 cycles [2] L 2 * is 30 or less, a 2 * is 0 or more and 2.5 or less, and b 2 * is -2.5 or more and 0.5 or less, according to [1]. Decorative sheet.
[3] The average spectral reflectance of the wavelength range of 360 nm or more and 780 nm or less measured by irradiating the first main surface of the decorative sheet with light having a wavelength range of 360 nm or more and 780 nm or less is 10% or less, [1] or [ 2] The decorative sheet described in.
[4] The spectral reflectance at a wavelength of 750 nm measured by irradiating the first main surface of the decorative sheet with light having a wavelength of 750 nm is 30% or less, and light having a wavelength of 800 nm is emitted to the first main surface of the decorative sheet. The decorative sheet according to [3], wherein the spectral reflectance at a wavelength of 800 nm measured by irradiation is 55% or more.
[5] The decorative sheet according to any one of [1] to [4], wherein the black pigment is an infrared transmissive pigment.
[6] The decorative sheet according to [5], wherein the infrared transmissive pigment is selected from an azomethine azo pigment and a perylene black pigment.
[7] The decorative sheet according to any one of [1] to [6], wherein the blue pigment is a phthalocyanine pigment.
[8] In a state where the base sheet is present alone, the average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the surface of the base sheet with light having a wavelength range of 781 nm or more and 2500 nm or less is 30. The decorative sheet according to any one of [1] to [7], which is% or more.
[9] The decorative sheet according to any one of [1] to [8], wherein the base material sheet is a colored resin sheet.
[10] A transparent resin layer provided on the first main surface side of the second dark color layer and a surface protective layer provided on the first main surface side of the transparent resin layer are further provided [1]. The decorative sheet according to any one of [9].
[11] The decorative sheet according to [10], wherein the surface protective layer is a cured product of an ionizing radiation curable resin composition.
[12] A decorative member comprising an adherend and the decorative sheet according to any one of [1] to [11] so that the adherend and the base sheet of the decorative sheet face each other.
[13] The decorative member according to [12], wherein the adherend is at least one member selected from a wood member, a metal member, and a resin member.
[14] The average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the surface of the decorative member on the decorative sheet side with light having a wavelength range of 781 nm or more and 2500 nm or less is 50% or more, [12] or [ 13] The decorative member.

According to the present invention, there is provided a decorative sheet or a decorative member that continuously exhibits black color and exhibits heat shielding performance.

FIG. 1 is a side view schematically showing a configuration of a decorative sheet according to an embodiment of the present invention. FIG. 2 is a side view schematically showing a configuration of a decorative member according to an embodiment of the present invention. FIG. 3 is a diagram showing a spectral reflectance curve having a wavelength range of 300 nm or more and 2500 nm or less in the base material sheet used in the examples.

[Definition]
The parameters used in the present invention are defined as follows.

"L ^* a ^* b ^* color system" means a color system standardized by the CIE (International Commission on Illumination) and adopted in JIS Z 8781-4: 2013. In the L ^* a ^* b ^* color system, the lightness is represented by L ^* , and the chromaticity indicating hue and saturation is represented by a ^* and b ^* .

“L ^* a ^* b ^* color-based L ^* , a ^* and b ^* ” for decorative sheets are specular colorimeters (manufactured by Nippon Denshoku Industries Co., Ltd.) before or after the weather resistance test for decorative sheets. SE6000) is used to irradiate the first main surface of the decorative sheet with light (D65 light source) at an incident angle of 10 degrees (the normal direction of the first main surface of the decorative sheet is 0 degrees) to reflect all light. Measure based on light (specular reflected light + diffuse reflected light).

The weather resistance test for the decorative sheet is performed by JIS K 5600-7-7 using a sunshine carbon arc lamp type weather resistance tester (Suga Test Instruments Co., Ltd. Sunshine Weatherometer S300) conforming to JIS B 7753: 2007. : Conducted for 4000 hours under the conditions according to 2008. The conditions of the weather resistance test are as follows.
Discharge voltage: 50 ± 2V
Discharge current: 60 ± 2A
Glass filter: A type Black panel temperature: 63 ± 3 ° C
Water injection conditions:
Pressure: 0.08 to 0.13 MPa
Water volume: 2100 + 100 mL / min Injection time: 18 minutes / 120 minutes Irradiation Water quality: pH about 6.8
Water temperature: 16 ± 5 ° C
Relative humidity: 90 ± 5% (during condensation), 50 ± 5% (during irradiation)
Sample surface irradiance: 255 W / m ² (continuous irradiation at 300 to 400 nm)
1 cycle: 120 minutes (102 minutes of irradiation followed by 18 minutes of irradiation and injection)
Number of cycles: 2000 cycles

In the present specification, the decorative sheet after the weather resistance test is referred to as "cosmetic sheet after the weather resistance test", but the decorative sheet before the weather resistance test (initial state) is "makeup before the weather resistance test". Instead of writing "sheet", simply write "decorative sheet".

The "average spectral reflectance (%) in the wavelength range of 781 nm or more and 2500 nm or less" for the decorative sheet, the decorative member, or the base material sheet is such that each wavelength (that is, the wavelength 781 nm) is changed from the wavelength 781 nm to the wavelength 2500 nm by 1 nm. The spectral reflectance (%) of 782 nm, 783 nm, ... 2498 nm, 2499 nm, 2500 nm) is measured, and the sum of the measured 1720 spectral reflectances is divided by 1720 to calculate. "Spectral reflectance (%) of each wavelength" is measured on the surface of a decorative sheet, decorative member or base sheet using a spectrophotometer (V-670 manufactured by JASCO Corporation) conforming to JIS K 0115: 2004. Light of each wavelength is irradiated at an incident angle of 5 degrees (the normal direction of the surface of the decorative sheet, decorative member, or base sheet is 0 degrees), and the ratio of the total reflected light to the parallel incident light (that is, the total light reflectance). ). The method for measuring the total light reflectance conforms to JIS K 7375: 2008. The surface irradiated with light of each wavelength is the first main surface of the decorative sheet for the decorative sheet and the decorative member, and the surface on the first main surface side of the base sheet in principle.

The "average spectral reflectance (%) in the wavelength range of 360 nm or more and 780 nm or less" for the decorative sheet, the decorative member or the base material sheet is determined by changing the wavelength from the wavelength of 360 nm to the wavelength of 780 nm by 1 nm and each wavelength (that is, the wavelength of 360 nm, The spectral reflectance (%) of 361 nm, 362 nm, ..., 778 nm, 779 nm, 780 nm) is measured, and the sum of the measured 421 spectral reflectances is divided by 421 to calculate. "Spectral reflectance (%) of each wavelength" is measured on the surface of a decorative sheet, decorative member or base sheet using a spectrophotometer (V-670 manufactured by JASCO Corporation) conforming to JIS K 0115: 2004. Light of each wavelength is irradiated at an incident angle of 5 degrees (the normal direction of the surface of the decorative sheet, decorative member, or base sheet is 0 degrees), and the ratio of the total reflected light to the parallel incident light (that is, the total light reflectance). ). The method for measuring the total light reflectance conforms to JIS K 7375: 2008. The surface irradiated with light of each wavelength is the first main surface of the decorative sheet for the decorative sheet and the decorative member, and the surface on the first main surface side of the base sheet in principle.

The "spectral reflectance (%) at a wavelength of 750 nm" or the "spectral reflectance (%) at a wavelength of 800 nm" for a decorative sheet, a decorative member, or a base sheet is a spectrophotometer based on JIS K 0115: 2004 (Nippon Spectral Co., Ltd.). Wavelength at an incident angle of 5 degrees (the normal direction of the surface of the decorative sheet, decorative member or base sheet is 0 degree) on the surface of the decorative sheet, decorative member or base sheet using a company-made V-670). Light with a wavelength of 750 nm or a wavelength of 800 nm is irradiated, and the ratio of the total reflected light beam to the parallel incident light beam (that is, the total light reflectance) is measured. The method for measuring the total light reflectance conforms to JIS K 7375: 2008. The surface irradiated with light of each wavelength is the first main surface of the decorative sheet for the decorative sheet and the decorative member, and the surface on the first main surface side of the base sheet in principle.

"Average spectral reflectance (%) in the wavelength range of 781 nm or more and 2500 nm or less", "Average spectral reflectance (%) in the wavelength range of 360 nm or more and 780 nm or less", "Spectral reflectance (%) in the wavelength range of 750 nm" or The "spectral reflectance (%) at a wavelength of 800 nm" is a state in which the base sheet is present alone (that is, a state in which no layer is laminated on both sides of the base sheet), as described above. The surface on the first main surface side of the above is irradiated with light of each wavelength for measurement. Therefore, when measuring the spectral reflectance of the base sheet from the form of the decorative sheet in which the first dark color layer, the second dark color layer, the transparent resin layer and the surface protective layer are laminated on the base sheet, the decorative sheet is used. All layers (first dark color layer, second dark color layer, transparent resin layer and surface protective layer) laminated on the first main surface side of the base sheet are removed by cutting or peeling, and the first main of the base sheet is removed. The spectral reflectance of the base sheet is measured with the surface on the surface side exposed. However, when the spectral reflectances of both the front and back surfaces of the base sheet are the same, the spectral reflectance of the surface on the second main surface side of the base sheet forming the second main surface of the decorative sheet is measured. Is the spectral reflectance of the base sheet.

“L ^* a ^* b ^* color-based L ^* , a ^* and b ^* ” relating to the transparent resin layer means that the transparent resin layer exists alone (that is, any layer is formed on both sides of the transparent resin layer). Using a spectrocolorimeter (SE6000 manufactured by Nippon Denshoku Kogyo Co., Ltd.), the angle of incidence on the surface of the transparent resin layer on the first main surface side is 10 degrees (the first main surface side of the transparent resin layer). Light (D65 light source) is irradiated with light (with the normal direction of the surface set to 0 degrees), and measurement is performed based on total light reflected light (mirror surface reflected light + diffuse reflected light). Therefore, when measuring L ^* , a ^*, and b ^* of the transparent resin layer from the form of the decorative sheet in which the first dark color layer, the second dark color layer, the transparent resin layer, and the surface protective layer are laminated on the base sheet. Cuts or peels off all the layers (base sheet, first dark color layer, second dark color layer, and surface protection layer) laminated on the first main surface side and the second main surface side of the transparent resin layer from the decorative sheet. L ^* , a ^*, and b ^* of the transparent resin layer are measured in a state where the surface of the transparent resin layer is exposed.

In the present specification, the numerical range expressed as "numerical value A to numerical value B" has a numerical value A as an upper limit value and a numerical value B as a lower limit value (that is, a numerical value) unless otherwise specified. (Numerical range including A and numerical value B).

[Cosmetic sheet]
Hereinafter, the decorative sheet according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a side view schematically showing the configuration of the decorative sheet 10 according to the embodiment of the present invention.

As shown in FIG. 1, the decorative sheet 10 has a first main surface S1 and a second main surface S2 located on the opposite side of the first main surface S1. In the present embodiment, the first main surface S1 is formed by the surface protective layer 15, and the second main surface S2 is formed by the base material sheet 11.

As shown in FIG. 1, the decorative sheet 10 includes a base sheet 11, a first dark color layer 12, and a second dark color layer 13 in this order from the second main surface S2 side.

As shown in FIG. 1, the decorative sheet 10 has a transparent resin layer 14 provided on the first main surface S1 side of the second dark color layer 13 and a surface provided on the first main surface S1 side of the transparent resin layer 14. A protective layer 15 is further provided.

L * a * b * color system L * , a * and b * measured by irradiating the first main surface S1 of the decorative sheet 10 with light are designated as L 1 * , a 1 * and b 1 * , respectively. After performing a weather resistance test on the decorative sheet 10, the first main surface S1 of the decorative sheet 10 after the weather resistance test is irradiated with light and measured. L * a * b * Color system L * , a * and b *, respectively L 2 *, when the a 2 * and b 2 *, L 1 * is 30 or less, a 1 * is -1.5 to 1.5, b 1 * -2 .0 or more and 1.3 or less, and ΔE = ((L 2 * -L 1 * ) 2 + (a 2 * -a 1 * ) 2 + (b 2 * -b 1 * ) 2 ) 1/2 The defined color difference ΔE is less than 4.

When L ₁ ^* is 30 or less, a ₁ ^* is -1.5 or more and 1.5 or less, and b ₁ ^* is -2.0 or more and 1.3 or less, the decorative sheet 10 may exhibit a dark color. it can. Further, when the color difference ΔE is less than 4, the decorative sheet 10 can continuously exhibit a dark color even when used outdoors. The "dark color" means that the color tone is a low-brightness chromatic color or an achromatic color. For example, achromatic colors such as black and dark gray, and chromatic colors such as dark blue, brown, yellowish brown, dark green, dark purple, and fat color correspond to dark colors. Whether or not the decorative sheet 10 exhibits a dark color is determined by visually recognizing the decorative sheet 10 from the first main surface S1 side.

The visible light applied to the first main surface S1 of the decorative sheet 10 is absorbed by the second dark color layer 13. Visible light that has passed through the second dark color layer 13 without being absorbed by the second dark color layer 13 is absorbed by the first dark color layer 12. As the period of use of the decorative sheet 10 becomes longer, the visible light absorption action of the black pigment contained in the second dark color layer 13 weakens. In particular, when the decorative sheet 10 is used outdoors, the visible light absorption action of such a black pigment is significantly weakened. When the visible light absorption action of the black pigment contained in the second dark color layer 13 is weakened, the visible light transmitted through the second dark color layer 13 without being absorbed by the second dark color layer 13 increases. However, the iron oxide pigment contained in the first dark color layer 12 has high weather resistance. Further, since the first dark color layer 12 is protected by the second dark color layer 13, the visible light absorption action of the blue pigment contained in the first dark color layer 12 is that of the black pigment contained in the second dark color layer 13. It is less likely to be weakened than the visible light absorption effect. Therefore, even if the visible light absorption action of the black pigment contained in the second dark color layer 13 is weakened and the visible light transmitted through the second dark color layer 13 without being absorbed by the second dark color layer 13 increases, the first The iron oxide pigment and the blue pigment contained in the dark color layer 12 can absorb visible light transmitted through the second dark color layer 13 without being absorbed by the second dark color layer 13. As a result, the decorative sheet 10 can continuously exhibit a dark color even when used outdoors.

L ₁ ^* is not particularly limited as long as it is 30 or less, but is preferably 28 or less, and more preferably 25 or less. The lower limit of the L ₁ ^* value is not particularly limited, but is, for example, 20, 21, 22 or 23. a ₁ ^* is not particularly limited as long as it is −1.5 or more and 1.5 or less, but is preferably −1.3 or more and 1.3 or less, and more preferably −1.0 or more and 1.2 or less. b ₁ ^* is not particularly limited as long as it is −2.0 or more and 1.3 or less, but is preferably -1.8 or more and 1.0 or less, and more preferably -1.5 or more and 0.8 or less. ΔE is not particularly limited as long as it is less than 4, but is preferably 3.8 or less, more preferably 3.5 or less, and even more preferably 3.3 or less. The lower limit of ΔE is not particularly limited, but is, for example, 0.1, 0.2, 0.3, 0.4 or 0.5.

L ₂ ^* is preferably 30 or less, more preferably 29 or less, and even more preferably 28 or less. The lower limit of the L ₂ ^* value is not particularly limited, but is, for example, 20, 21, 22 or 23. a ₂ ^* is preferably 0 or more and 2.5 or less, more preferably 0.2 or more and 2.3 or less, and even more preferably 0.4 or more and 2.0 or less. b ₂ ^* is preferably −2.5 or more and 0.5 or less, more preferably -2.2 or more and 0.25 or less, and even more preferably -2.0 or more and 0 or less.

The average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the first main surface S1 of the decorative sheet 10 with light having a wavelength range of 781 nm or more and 2500 nm or less is 35% or more. As a result, the decorative sheet 10 can exhibit heat shielding performance based on near infrared reflection performance. The average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the decorative sheet 10 is not particularly limited as long as it is 35% or more, but is preferably 37% or more, more preferably 40% or more, and even more preferably 43% or more. The upper limit of the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the decorative sheet 10 is not particularly limited, but is, for example, 90%, 85% or 80%.

The average spectral reflectance of the decorative sheet 10 of 781 nm or more and 2500 nm or less is, for example, the near infrared rays that are irradiated to the first main surface S1 and transmitted through the second dark color layer 13 and the first dark color layer 12 are reflected by the base sheet 11. Thereby, it can be adjusted to a desired range. From the viewpoint of improving the near-infrared transmissivity of the second dark color layer 13, the black pigment contained in the second dark color layer 13 is preferably an infrared transmissive pigment. Further, from the viewpoint of improving the near-infrared transmissivity of the first dark color layer 12, the thickness of the first dark color layer 12 and the amount of the iron oxide pigment and the blue pigment contained in the first dark color layer 12 can be reduced. preferable. Even if the amount of the iron oxide pigment and the blue pigment contained in the first dark color layer 12 is reduced, the first dark color layer 12 gives a dark color to the decorative sheet 10 in cooperation with the second dark color layer 13, so that the makeup is made up. The sheet 10 can exhibit a dark color.

The average spectral reflectance of the wavelength range of 360 nm or more and 780 nm or less measured by irradiating the first main surface S1 of the decorative sheet 10 with light having a wavelength range of 360 nm or more and 780 nm or less is preferably 10% or less. As a result, the decorative sheet 10 can more effectively exhibit a dark color. The average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less in the decorative sheet 10 is preferably 10% or less, more preferably 9% or less, and even more preferably 8% or less. The lower limit of the average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less in the decorative sheet 10 is not particularly limited, but is, for example, 1%, 3% or 5%.

The average spectral reflectance of the decorative sheet 10 of 360 nm or more and 780 nm or less is, for example, the amount of the black pigment contained in the second dark color layer 13 and the amount of the iron oxide pigment and the blue pigment contained in the first dark color layer 12. By adjusting the visible light absorption of the second dark color layer 13 and the visible light absorption of the first dark color layer 12, it can be adjusted to a desired range.

The spectral reflectance at a wavelength of 750 nm measured by irradiating the first main surface S1 of the decorative sheet 10 with light having a wavelength of 750 nm is preferably 30% or less. The spectral reflectance of the decorative sheet 10 at a wavelength of 750 nm is preferably 30% or less, more preferably 28% or less, and even more preferably 25% or less. The lower limit of the spectral reflectance at a wavelength of 750 nm in the decorative sheet 10 is not particularly limited, but is, for example, 1%, 3%, or 5%.

The spectral reflectance at a wavelength of 800 nm measured by irradiating the first main surface S1 of the decorative sheet 10 with light having a wavelength of 800 nm is preferably 55% or more. The spectral reflectance at a wavelength of 800 nm in the decorative sheet 10 is preferably 55% or more, more preferably 58% or more, and even more preferably 60% or more. The upper limit of the spectral reflectance at a wavelength of 800 nm in the decorative sheet 10 is not particularly limited, but is, for example, 95%, 90%, or 85%.

The decorative sheet 10 has a feature that the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less is 35% or more, a feature that the average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less is 10% or less, and a wavelength range of 750 nm. It is preferable to have a feature that the spectral reflectance is 30% or less and a feature that the spectral reflectance at a wavelength of 800 nm is 55% or more. As a result, the spectral reflectance of the decorative sheet 10 has a sharp rise in the wavelength range of 700 nm or more and 800 nm or less, and the decorative sheet 10 has a dark color based on a low spectral reflectance in the visible light region and a near infrared region. It is possible to more effectively achieve both the performance of heat shielding performance based on the high spectral reflectance of.

(Base sheet)
The base sheet 11 plays a role of supporting the layer provided on the first main surface S1 side of the base sheet 11.

The spectral reflectance of the base sheet 11 affects the spectral reflectance of the decorative sheet 10. Therefore, the spectral reflectance of the decorative sheet 10 can be adjusted by adjusting the spectral reflectance of the base sheet 11.

The average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the base sheet 11 is preferably 30% or more, more preferably 35% or more, and even more preferably 40% or more. The upper limit of the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the base sheet 11 is not particularly limited, but is, for example, 90%, 85% or 80%.

The average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less in the base sheet 11 is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more. The upper limit of the average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less in the base sheet 11 is not particularly limited, but is, for example, 95%, 90%, or 85%.

The spectral reflectance of the base sheet 11 at a wavelength of 750 nm is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more. The upper limit of the spectral reflectance at a wavelength of 750 nm on the base sheet 11 is not particularly limited, but is, for example, 95%, 90%, or 85%.

The spectral reflectance of the base sheet 11 at a wavelength of 800 nm is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more. The upper limit of the spectral reflectance at a wavelength of 800 nm on the base sheet 11 is not particularly limited, but is, for example, 95%, 90%, or 85%.

For the spectral reflectance of the base sheet 11, the type of resin constituting the base sheet 11, the thickness of the base sheet 11, the type and amount of the colorant when the base sheet 11 contains a colorant, and the like are appropriately used. It can be adjusted by adjusting.

Examples of the resin constituting the base sheet 11 include polyester resin, polyolefin resin and the like. The resin constituting the base sheet 11 may be a single type or a combination of two or more types.

Examples of the polyester resin constituting the base sheet 11 include polyethylene terephthalate (hereinafter sometimes referred to as “PET”), polybutylene terephthalate, polyethylene naphthalate, polyallylate, polycarbonate, ethylene terephthalate-isophthalate copolymer, and the like. Examples thereof include polyarylate, and among these, polyethylene terephthalate and polybutylene terephthalate are preferable, and polyethylene terephthalate is more preferable.

Examples of the polyolefin resin constituting the base sheet 11 include polyethylene (low density, medium density, high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer and the like. Of these, polyethylene and polypropylene are preferable.

The thickness of the base sheet 11 is preferably 20 μm or more and 200 μm or less, more preferably 40 μm or more and 150 μm or less, and even more preferably 60 μm or more and 100 μm or less.

The base sheet 11 is preferably a colored resin sheet composed of a colored resin. By using the colored resin sheet as the base sheet 11, the surface hue of the adherend can be well concealed even when the surface hue of the adherend to which the decorative sheet 10 is attached varies. Because it can be done, excellent design can be obtained. Further, the stability of the color tone of the first dark color layer 12 and the second dark color layer 13 provided on the base sheet 11 can be ensured. From the viewpoint of achieving the desired spectral reflectance of the base sheet 11, the colored resin sheet is preferably colored white (that is, contains a white pigment).

The colorant may be appropriately selected depending on the intended use. For example, the base sheet 11 can be colored transparent or colored opaque. Generally, from the viewpoint of hiding the surface of the adherend, it is preferable to make it colored and opaque.

Examples of the colorant include inorganic pigments such as iron black, titanium white, antimony white, yellow lead, titanium yellow, petals, cadmium red, ultramarine blue, and cobalt blue; and organic pigments such as quinacridone red, isoindolinone yellow, and phthalocyanine blue. Pigments or dyes; metal pigments made of scaly foil pieces such as aluminum and brass; titanium dioxide-coated mica, pearl pigments made of scaly foil pieces such as basic lead carbonate, and the like.

When the base sheet 11 contains carbon black (black) as a colorant, the content of carbon black is 100 mass of the resin forming the base sheet 11 from the viewpoint of realizing the excellent heat shielding performance of the decorative sheet 10. It is preferably 5.0 parts by mass or less, more preferably 1.0 part by mass or less, and most preferably zero (without adding carbon black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated.

When the base sheet 11 contains titanium oxide as a white pigment, the crystal form of titanium oxide is not particularly limited, and can be appropriately selected from known crystal forms such as rutile type, anatase type, and brookite type. The rutile type is preferable from the viewpoint of having excellent whiteness, weather resistance, heat shielding performance and the like. Further, since titanium oxide may deteriorate the resin by the photocatalytic action, it is preferable that the surface is treated with a surface coating agent for the purpose of stabilizing the photocatalytic action, and the composition of the surface coating agent is limited. Although not intended, examples thereof include inorganic oxides such as silicon oxide, alumina, and zinc oxide. The coating method of the surface coating agent is not particularly limited, and titanium oxide obtained by a known method can be used.

The amount of the colorant contained in the base sheet 11 is usually 1 part by mass or more with respect to 100 parts by mass of the resin constituting the base sheet 11 from the viewpoint of realizing the desired spectral reflectance in the base sheet 11. It is 70 parts by mass or less, preferably 1 part by mass or more and 50 parts by mass or less.

The base sheet 11 is physically formed on one or both sides by an oxidation method, an unevenness method, or the like in order to enhance the interlayer adhesion between the base sheet 11 and other layers and the adhesiveness with various adherends. Physical or chemical surface treatments can be applied. Examples of the oxidation method include a corona discharge treatment, a chromium oxidation treatment, a flame treatment, a hot air treatment, an ozone / ultraviolet treatment method, and the like, and examples of the unevenness method include a sandblast method and a solvent treatment method. These surface treatments are appropriately selected according to the type of the base material, but in general, the corona discharge treatment method is preferably used from the viewpoints of effectiveness and operability. In addition, treatments such as forming a primer layer and a back surface primer layer may be performed for the purpose of strengthening the interlayer adhesion between the base sheet 11 and each layer.

The base sheet 11 may contain an inorganic filler, if necessary. Examples of the inorganic filler include powders of calcium carbonate, barium sulfate, clay, talc, silica (silicon dioxide), alumina (aluminum oxide) and the like. The amount of the inorganic filler contained in the base sheet 11 is usually 1 part by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the resin forming the base sheet 11. The base sheet 11 may contain various other additives such as a foaming agent, a flame retardant, a lubricant, an antioxidant, an ultraviolet absorber, and a light stabilizer, if necessary.

(First dark color layer)
The first dark color layer 12 is provided on the first main surface S1 side of the base sheet 11.

The first dark color layer 12 contains an iron oxide pigment and a blue pigment. The first dark color layer 12 exhibits a dark color due to the visible light absorption action of the iron oxide pigment and the blue pigment. The first dark color layer 12 has an effect of imparting a dark color to the decorative sheet 10 in cooperation with the second dark color layer 13 to improve the design of the decorative sheet 10 and also has an effect of hiding the base sheet 11. The first dark color layer 12 may be partially formed on the upper surface of the lower layer (base sheet 11 in this embodiment) so as to be recognized as a pattern, but the entire surface of the decorative sheet 10 is recognized as a dark color. It is preferable that it is formed on the entire upper surface of the lower layer so as to be formed. That is, the first dark color layer 12 is preferably a solid layer formed on the entire upper surface of the lower layer.

Examples of the method for forming the first dark color layer 12 include a coating method and a printing method. Examples of the coating method include a roll coating method, a knife coating method, an air knife coating method, a die coating method, a lip coating method, a comma coating method, a kiss coating method, a flow coating method, and a dip coating method. Examples of the printing method include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, an inkjet printing method, and the like. The first dark color layer 12 is preferably a print layer.

The iron oxide-based pigment contained in the first dark color layer 12 can be appropriately selected from known iron oxide-based pigments widely used as inorganic pigments.

Examples of iron oxide pigments include red hematite (diiron trioxide, α-Fe ₂ O ₃ ), black magnetite (triiron tetroxide, Fe ₃ O ₄ ), and yellow gelatinite (ferred hydrated iron oxide). , Α-FeOOH), brown maghemite (γ-Fe ₂ O ₃ ), reddish brown lepidoclosite (γ-FeOOH) and the like. One type of iron oxide pigment may be used alone, or two or more types may be used alone. The iron oxide pigment is preferably Fe ₂ O ₃ . Fe ₂ O ₃ may be a part of the iron oxide-based pigment contained in the first dark color layer 12, or may be the entire iron oxide-based pigment contained in the first dark color layer 12. When Fe ₂ O ₃ is a part of the iron oxide-based pigment contained in the first dark color layer 12, the amount of Fe ₂ O ₃ is the total amount of the iron oxide-based pigment contained in the first dark color layer 12. On the other hand, it is preferably 80% by mass or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more.

The blue pigment contained in the first dark color layer 12 may be a blue organic pigment or a blue inorganic pigment. The first dark color layer 12 may contain either a blue organic pigment or a blue inorganic pigment, or may contain both a blue organic pigment and a blue inorganic pigment.

Examples of the blue organic pigment include phthalocyanine-based, indigo-based, anthraquinone-based, indophenol-based pigments, dioxazine-based and other blue organic pigments. One type of blue organic pigment may be used alone, or two or more types may be used in combination. The blue organic pigment is preferably a phthalocyanine type. Examples of the phthalocyanine-based blue organic pigment include copper phthalocyanine blue and cobalt phthalocyanine blue. The phthalocyanine-based blue organic pigment is preferably copper phthalocyanine blue. Copper phthalocyanine blue can exhibit sufficient dark color when combined with an iron oxide pigment such as Fe ₂ O ₃ . Further, copper phthalocyanine blue has relatively low infrared absorption. As copper phthalocyanine blue, C.I. I. Pigment Blue 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, and the like. In addition, "CI Pigment Blue 15: 1" and the like are color index names. The copper phthalocyanine blue may be a stable type (β type) or an unstable type (α type), but is preferably an α type having a stronger coloring power than the β type. The copper phthalocyanine blue may be a part of the blue pigment contained in the first dark color layer 12, or may be the entire blue pigment contained in the first dark color layer 12. When the copper phthalocyanine blue is a part of the blue pigment contained in the first dark color layer 12, the amount of the copper phthalocyanine blue is preferably 80 with respect to the total amount of the blue pigment contained in the first dark color layer 12. It is by mass% or more, more preferably 85% by mass or more, and even more preferably 90% by mass or more.

Examples of blue inorganic pigments include ultramarine blue (ultramarine), azurite, prusian blue (dark blue), cobalt blue (cobalt aluminate), cerulean blue (cobalt tinate), cobalt chromium blue, and cobalt-aluminum-silicon oxide. , Cobalt-zinc-silicon oxide, smalto, manganese blue and the like. One type of blue inorganic pigment may be used alone, or two or more types may be used in combination.

The first dark color layer 12 may be composed of only the iron oxide pigment and the blue pigment, or may contain other components. Examples of other components include a binder resin. The binder resin can be appropriately selected in consideration of the dispersibility of the iron oxide pigment and the blue pigment. Examples of the binder resin include curable resins such as thermoplastic resins, one-component curable resins, and two-component curable resins. Specifically, urethane resin, acrylic urethane resin, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / acrylic copolymer resin, chlorinated polypropylene resin, acrylic resin, polyester resin, polyamide resin, butyral resin. , Polystyrene resin, nitrocellulose resin (vitrified cotton), cellulose acetate resin and the like can be used alone or in combination of two or more. Examples of the components other than the binder resin include colorants other than iron oxide pigments and blue pigments, stabilizers, plasticizers, catalysts, and curing agents. Specific examples of the colorant are the same as those described above with respect to the colorant contained in the base sheet 11. The first dark color layer 12 preferably does not contain carbon black (black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated.

The amount of iron oxide pigment and blue pigment contained in the first dark color layer 12, the thickness of the first dark color layer 12, and the like are determined by the spectral reflectance of the decorative sheet 10 and the decorative sheet before and after the weather resistance test. It affects the L ^* value, a ^* value, and b ^* value of 10. Therefore, the amount of the iron oxide pigment and the blue pigment contained in the first dark color layer 12, the thickness of the first dark color layer 12, and the like are determined by the spectral reflectance of the decorative sheet 10 and before and after the weather resistance test. It is preferable that the L ^* value, a ^* value and b ^* value of the decorative sheet 10 are adjusted so as to be in a desired range.

The amount of the iron oxide-based pigment contained in the first dark color layer 12 is preferably 1% by mass or more and 40% by mass or less, more preferably 3% by mass, based on the total amount of solids contained in the first dark color layer 12. It is 35% by mass or less, and even more preferably 5% by mass or more and 30% by mass or less.

The amount of the blue pigment contained in the first dark color layer 12 is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1% by mass, based on the total amount of solids contained in the first dark color layer 12. It is 8% by mass or less, and even more preferably 1.5% by mass or more and 5% by mass or less.

The mass ratio of the iron oxide-based pigment and the blue pigment (mass of the iron oxide-based pigment: mass of the blue pigment) contained in the first dark color layer 12 is preferably 2: 8 to 8: 2, and more preferably 3: It is 7 to 7: 3, and even more preferably 4: 6 to 6: 4.

The thickness of the first dark color layer 12 is preferably 0.1 μm or more and 10 μm or less, more preferably 0.3 μm or more and 8 μm or less, and even more preferably 0.5 μm or more and 5 μm or less.

Examples of the ink used for forming the first dark color layer 12 include a binder resin mixed with an iron oxide pigment and a blue pigment. The ink may contain a colorant other than the iron oxide pigment and the blue pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent and the like. Specific examples of the colorant contained in the ink are the same as those described above with respect to the colorant contained in the base sheet 11. The ink preferably does not contain carbon black (black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated. Since the solvent in the ink evaporates, the amounts of the iron oxide-based black pigment, the blue pigment, and the binder resin (based on the solid content) contained in the ink are each iron oxide-based contained in the first dark color layer 12. It corresponds to the amount of pigment, blue pigment and binder resin (based on solid content).

When forming the first dark color layer 12, the amount of ink applied per unit area (for example, one surface of the base sheet 11) to which ink is applied (based on solid content) is preferably 0. It is 1 g / m ² or more and 10 g / m ² or less, more preferably 0.3 g / m ² or more and 8 g / m ² or less, and even more preferably 0.5 g / m ² or more and 5 g / m ² or less.

The first dark color layer 12 may be composed of a single layer or may be composed of a plurality of layers.

(Second dark color layer)
The second dark color layer 13 is provided on the first main surface S1 side of the first dark color layer 12. The boundary between the first dark color layer 12 and the second dark color layer 13 is not always clear. For example, at the boundary between the first dark color layer 12 and the second dark color layer 13, a region in which the components constituting the first dark color layer 12 and the components constituting the second dark color layer 13 are mixed may be formed. ..

The second dark color layer 13 contains a black pigment. The second dark color layer 13 exhibits a dark color due to the visible light absorption action of the black pigment. The second dark color layer 13 has an effect of imparting a dark color to the decorative sheet 10 and improving the design of the decorative sheet 10, as well as an effect of concealing the base sheet 11. The second dark color layer 13 may be partially formed on the upper surface of the lower layer (in the present embodiment, the first dark color layer 12) so as to be recognized as a pattern, but the entire surface of the decorative sheet 10 is dark. As will be recognized, it is preferably formed over the entire upper surface of the lower layer. That is, the second dark color layer 13 is preferably a solid layer formed on the entire upper surface of the lower layer.

Examples of the method for forming the second dark color layer 13 include a coating method and a printing method. Examples of the coating method include a roll coating method, a knife coating method, an air knife coating method, a die coating method, a lip coating method, a comma coating method, a kiss coating method, a flow coating method, and a dip coating method. Examples of the printing method include a gravure printing method, an offset printing method, a screen printing method, a flexographic printing method, an electrostatic printing method, an inkjet printing method, and the like. The second dark color layer 13 is preferably a print layer.

The black pigment contained in the second dark color layer 13 may be an organic black pigment or an inorganic black pigment. The second dark color layer 13 may contain either an organic black pigment or an inorganic black pigment, or may contain both an organic black pigment and an inorganic black pigment.

Examples of organic black pigments include azomethine azo black pigment, perylene black pigment, azo black pigment, aniline black, acetylene black, carbon black, lamp black, benzimidazolone pigment brown 25 (brown) and phthalocyanine blue (blue). Examples include mixed pigments with. One type of organic black pigment may be used alone, or two or more types may be used in combination. The organic black pigment is preferably one or more organic black pigments selected from azomethine azo pigments and perylene black pigments.

Azomethine The azo-based black pigment is not particularly limited as long as it has a methine group and an azomethine group. For example, Japanese Patent Application Laid-Open No. 62-30202 and Japanese Patent Application Laid-Open No. 62-32149 (Japanese Patent Application Laid-Open No. 4-15265). ), JP-A-2002-256165 (Patent No. 4084022), JP-A-2002-348491 (Patent No. 4084023), and the like.

Examples of the azomethine azo black pigment include compounds represented by the following formulas.

を表し、
ｎが２を表す場合、メチル基、エチル基、メトキシ基及びアニリノカルボニル基からなる群より選択される１又は２以上の置換基を有していてもよいフェニレン基、ナフチレン基又はビフェニレン基を表す。 In the above formula,
X represents a hydrogen atom or a halogen atom,
m represents an integer of 1 to 4
R ₁ represents a phenylene group, a naphthylene group or a biphenylene group which may have one or more substituents selected from the group consisting of a halogen atom, a methyl group, a methoxy group and a nitro group.
n represents 1 or 2
When n represents 1, R ₂ may have one or more substituents selected from the group consisting of a methyl group, an ethyl group, a methoxy group and an anilinocarbonyl group.

Represents
When n represents 2, a phenylene group, a naphthylene group or a biphenylene group which may have 1 or 2 or more substituents selected from the group consisting of a methyl group, an ethyl group, a methoxy group and an anirinocarbonyl group is used. Represent.

Examples of the azomethine azo black pigment include compounds represented by the following formulas.

In the above formula,
R represents a group selected from the group consisting of a lower alkyl group having 1 to 3 carbon atoms and a lower alkoxy group having 1 to 3 carbon atoms.
n represents an integer of 1-5
When n represents an integer of 2 or more, R may be the same or different.

Specific examples of the azomethine azo-based black pigment include 1-[[4-[(4,5,6,7-tetrachloro-3-oxo-isoindoline-1-iriden) amino] phenyl] azo] -2-hydroxy. -N- (4-Methyl-2-methylphenyl) -11H-benzo [a] carbazole-3-carboxyamide, (2-hydroxy-N- (2'-methyl-4'-methoxyphenyl) -1- { [4-[(4,5,6,7-tetrachloro-1-oxo-2,3-dihydro-1H-isoindol-3-idene) amino] phenyl] azo} -11H-benzo [a] -carbazole -3-carboxyamide) and the like.

Examples of the perylene-based black pigment include compounds represented by the following formulas.

を表す。 In the above formula,
R is the same or different,-(CH ₂ ) _2- OH, -CH _2- CH _2- Y (Y represents a phenyl group, a methyl group or a hydroxymethyl group), or

Represents.

Specific examples of the perylene-based black pigment include perylene-3,4,9,10-tetracarboxylic acid diimide represented by the following formula.

Examples of the inorganic black pigment include composite oxides, iron black, titanium black and the like. As the inorganic black pigment, one type may be used alone, or two or more types may be used in combination.

A composite oxide is an oxide containing at least two metal elements. The composite oxide is preferably a composite oxide containing at least a manganese element, that is, an oxide containing a manganese element and at least one metal element other than the manganese element. The metal element other than the manganese element contained in the composite oxide is not particularly limited, and can be appropriately selected from the viewpoint of obtaining a calm design with lower brightness, obtaining heat shielding performance, and the like. The metal element other than the manganese element contained in the composite oxide may be one kind alone or a combination of two or more kinds. Examples of metal elements other than manganese elements contained in the composite oxide include Group 2 elements such as calcium element and barium element; Yttrium element, lanthanum element, placeodium element; Group 3 element such as neodymium element, titanium element, and the like. Group 4 elements such as zirconium element; Group 13 element such as boron element, aluminum element, gallium element and indium element; metal element such as Group 15 element such as antimony element and bismuth element can be mentioned. Among these, Group 2 elements, Group 4 elements, and Group 15 elements are preferable, calcium element, titanium element, and bismuth element are more preferable, and calcium element and titanium element are further preferable. Particularly preferable specific examples of the composite oxide include a composite oxide containing a manganese element, a calcium element and a titanium element.

The structure of the composite oxide is not particularly limited, but from the viewpoint of being stable as a structure, obtaining excellent heat shielding performance and designability, etc., a perovskite structure, an orthorhombic structure, a hexagonal structure, etc. It is preferable that the structure is perovskite, and the perovskite structure is more preferable.

The black pigment contained in the second dark color layer 13 is preferably an infrared transmissive pigment. As a result, the near-infrared ray transmission of the second dark color layer 13 is improved, and the near-infrared absorption of the second dark color layer 13 is lowered, so that the heat shielding performance of the decorative sheet 10 can be improved. For example, the heat shielding performance of the decorative sheet 10 can be improved by reflecting the near infrared rays transmitted through the second dark color layer 13 on the base sheet 11. The "infrared transmissive pigment" means a pigment that transmits near infrared rays having a wavelength range of 781 nm or more and 2500 nm or less, preferably 60% or more, more preferably 65% or more, and even more preferably 70% or more.

The infrared transmissive pigment is preferably one or more pigments selected from azomethine azo pigments and perylene black pigments. The infrared transmissive pigment may be a part of the black pigment contained in the second dark color layer 13 or may be the entire black pigment contained in the second dark color layer 13. When the infrared transmissive pigment is a part of the black pigment contained in the second dark color layer 13, the amount of the infrared transmissive pigment is preferable with respect to the total amount of the black pigment contained in the second dark color layer 13. Is 5% by mass or more, more preferably 8% by mass or more, and even more preferably 10% by mass or more.

The second dark color layer 13 may be composed of only the black pigment, or may contain a component other than the black pigment. Examples of the components other than the black pigment include a binder resin. The binder resin can be appropriately selected in consideration of the dispersibility of the black pigment and the like. Examples of the binder resin include curable resins such as thermoplastic resins, one-component curable resins, and two-component curable resins. Specifically, urethane resin, acrylic urethane resin, vinyl chloride / vinyl acetate copolymer resin, vinyl chloride / vinyl acetate / acrylic copolymer resin, chlorinated polypropylene resin, acrylic resin, polyester resin, polyamide resin, butyral resin. , Polystyrene resin, nitrocellulose resin (vitrified cotton), cellulose acetate resin and the like can be used alone or in combination of two or more. In addition, examples of the components other than the binder resin include colorants other than black pigments, stabilizers, plasticizers, catalysts, curing agents and the like. Specific examples of the colorant are the same as those described above with respect to the colorant contained in the base sheet 11. The second dark color layer 13 preferably does not contain carbon black (black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated.

The amount of black pigment contained in the second dark color layer 13, the thickness of the second dark color layer 13, and the like are the spectral reflectance of the decorative sheet 10 and the L ^* value of the decorative sheet 10 before and after the weather resistance test. , A ^* and b ^* values are affected. Therefore, the amount of the black pigment contained in the second dark color layer 13, the thickness of the second dark color layer 13, and the like are determined by the spectral reflectance of the decorative sheet 10 and the L of the decorative sheet 10 before and after the weather resistance test. It is preferable that the ^* value, the a ^* value and the b ^* value are adjusted so as to be in a desired range.

When the organic black pigment is used alone as the black pigment contained in the second dark color layer 13, the amount of the organic black pigment contained in the second dark color layer 13 is the solid content contained in the second dark color layer 13. It is preferably 1% by mass or more and 100% by mass or less, more preferably 10% by mass or more and 50% by mass or less, and even more preferably 20% by mass or more and 40% by mass or less with respect to the total amount.

When the inorganic black pigment is used alone as the black pigment contained in the second dark color layer 13, the amount of the inorganic black pigment contained in the second dark color layer 13 is the solid content contained in the second dark color layer 13. It is preferably 1% by mass or more and 50% by mass or less, more preferably 3% by mass or more and 40% by mass or less, and even more preferably 5% by mass or more and 30% by mass or less with respect to the total amount.

When both an organic black pigment and an inorganic black pigment are used as the black pigment contained in the second dark color layer 13, the amount of the organic black pigment and the inorganic black pigment contained in the second dark color layer 13 is the second dark color. It is preferably 1% by mass or more and 100% by mass or less, more preferably 3% by mass or more and 50% by mass or less, and even more preferably 5% by mass or more and 40% by mass or less, based on the total amount of solids contained in the layer 13. .. The mass ratio of the inorganic black pigment to the organic black pigment (mass of the inorganic black pigment: mass of the organic black pigment) contained in the second dark color layer 13 is preferably 0.1: 1 to 3: 1. It is preferably 0.1: 1 to 2.5: 1.

The thickness of the second dark color layer 13 is preferably 0.1 μm or more and 10 μm or less, more preferably 0.3 μm or more and 8 μm or less, and even more preferably 0.5 μm or more and 5 μm or less.

Examples of the ink used for forming the second dark color layer 13 include a binder resin mixed with a black pigment. The ink may contain a colorant other than the black pigment, a solvent, a stabilizer, a plasticizer, a catalyst, a curing agent and the like. Specific examples of the colorant contained in the ink are the same as those described above with respect to the colorant contained in the base sheet 11. The ink preferably does not contain carbon black (black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated. Since the solvent in the ink evaporates, the amount of the black pigment and the binder resin (based on the solid content) contained in the ink is the amount of the black pigment and the binder resin (solid) contained in the second dark color layer 13, respectively. It corresponds to the minute standard).

When forming the second dark color layer 13, the amount of ink applied per unit area of the surface to which the ink is applied (for example, the surface of the first dark color layer 12 on the first main surface S1 side) (based on solid content). Is preferably 0.1 g / m ² or more and 10 g / m ² or less, more preferably 0.3 g / m ² or more and 8 g / m ² or less, and even more preferably 0.5 g / m ² or more and 5 g / m ² or less. is there.

The second dark color layer 13 may be composed of a single layer or may be composed of a plurality of layers.

(Transparent resin layer)
The transparent resin layer 14 is provided on the first main surface S1 side of the second dark color layer 13. The transparent resin layer 14 may also have a function as a color correction layer that corrects the L ^* a ^* b ^* color system L ^* value, a ^* value, and b ^* value in the decorative sheet 10. Accordingly, ^{the L} * ^a * ^{b *} color system of ^{L *} value in the transparent resin layer 14, ^{a *} by adjusting the value and ^{b *} value, the ^L * ^a * ^{b *} color system in the decorative sheet 10 ^{L *} The value, a ^* value and b ^* value can be adjusted. The transparent resin layer 14 also has an effect of protecting the first dark color layer 12 and the second dark color layer 13 and improving the scratch resistance. The transparent resin layer 14 is a layer provided as needed and can be omitted. Therefore, the present invention also includes an embodiment in which the transparent resin layer 14 is omitted.

The a ^* value and b ^* value of the L ^* a ^* b ^* color system in the transparent resin layer 14 shall be a ^* value: -1 or more and 0 or less, and b ^* value: -3 or more and -2 or less. preferable. Further, the L ^* value of the L ^* a ^* b ^* color system in the transparent resin layer 14 is preferably 30 to 50.

The L ^* a ^* b ^* color system L ^* value, a ^* value, and b ^* value of the transparent resin layer 14 are the type of resin constituting the transparent resin layer 14, the thickness of the transparent resin layer 14, and the transparent resin layer 14. When the plastic contains a colorant, it can be adjusted by appropriately adjusting the type and amount of the colorant.

The transparent resin layer 14 can be made of, for example, a thermoplastic resin. As the resin constituting the transparent resin layer 14, in addition to the above-mentioned specific examples (polyester resin, polyolefin resin) regarding the resin constituting the base material sheet 11, acrylic resin, polycarbonate resin, polyurethane resin, polystyrene resin, vinyl chloride resin, etc. Examples include vinyl acetate resin. From the viewpoint of improving moldability and scratch resistance, polyester resin and polyolefin resin are preferable, and polyolefin resin is more preferable. From the same viewpoint as this, it is preferable that both the base sheet 11 and the resin constituting the transparent resin layer 14 are polyolefin resins.

The transparent resin layer 14 may have transparency enough to allow the first dark color layer 12 and the second dark color layer 13 to be visually recognized, and may be colorless and transparent, as well as colored transparent or translucent. When the resin layer constituting the transparent resin layer 14 is colored, specific examples of the colorant contained in the resin layer are the same as those described above with respect to the colorant contained in the base sheet 11. The resin layer constituting the transparent resin layer 14 preferably does not contain carbon black (black). This is because carbon black has a property of easily absorbing heat, and therefore, when carbon black is used for the decorative sheet 10, the decorative sheet 10 easily absorbs heat and the heat shielding performance is deteriorated.

The thickness of the transparent resin layer 14 is preferably 20 μm or more and 130 μm or less, more preferably 30 μm or more and 100 μm or less, and even more preferably, from the viewpoint of realizing the desired L ^* value, a ^* value and b ^* value in the decorative sheet 10. Is 40 μm or more and 90 μm or less. When the thickness of the transparent resin layer 14 is within the above range, the protective function and scratch resistance of the first dark color layer 12 and the second dark color layer 13 can be expected to be improved.

From the viewpoint of improving the adhesiveness with each layer, the transparent resin layer 14 can be subjected to physical or chemical surface treatment such as an oxidation method or an unevenness method on one side or both sides. Examples of these physical or chemical surface treatments include the same methods as the surface treatment of the base sheet 11. Further, the transparent resin layer 14 can be subjected to a treatment such as forming a primer layer or a back surface primer layer from the viewpoint of improving the adhesiveness with each layer.

(Surface protective layer)
The surface protective layer 15 is provided on the first main surface S1 side of the transparent resin layer 14. The surface protective layer 15 is a layer located on the outermost surface of the decorative sheet 10, and is a layer that imparts surface characteristics such as scratch resistance, abrasion resistance, and chemical resistance to the decorative sheet 10. The surface protective layer 15 is preferably composed of a cured product of a resin composition containing a curable resin. The surface characteristics of the decorative sheet 10 can be improved by being composed of a cured product of the curable resin composition. The surface protective layer 15 is a layer provided as needed and can be omitted. Therefore, the present invention also includes an embodiment in which the surface protective layer 15 is omitted.

Examples of the curable resin used for forming the surface protective layer 15 include a thermosetting resin such as a two-component curable resin and an ionizing radiation curable resin, and a plurality of these are used, for example, ionizing radiation. It may be a so-called hybrid type in which a curable resin and a thermosetting resin are used in combination, or a curable resin and a thermoplastic resin are used in combination.

An ionizing radiation curable resin is preferable from the viewpoint of increasing the crosslink density of the resin forming the surface protective layer 15 and improving the scratch resistance and abrasion resistance of the surface, and it can be applied without a solvent. An electron beam curable resin is more preferable from the viewpoint of easy handling.

(Ionizing radiation curable resin)
The ionizing radiation curable resin is a resin having an energy quantum capable of cross-linking and polymerizing molecules in an electromagnetic wave or a charged particle beam, that is, a resin that is cross-linked and cured by irradiating with ultraviolet rays or an electron beam. is there. Specifically, it can be appropriately selected and used from the polymerizable monomer and the polymerizable oligomer or prepolymer conventionally used as an ionizing radiation curable resin.

Typically, as the polymerizable monomer, a (meth) acrylate-based monomer having a radically polymerizable unsaturated group in the molecule is preferable, and among them, a polyfunctional (meth) acrylate is preferable. Here, "(meth) acrylate" means "acrylate or methacrylate". The polyfunctional (meth) acrylate may be any (meth) acrylate having two or more ethylenically unsaturated bonds in the molecule, and is not particularly limited. One of these polyfunctional (meth) acrylates may be used alone, or two or more thereof may be used in combination.

Next, as the polymerizable oligomer, an oligomer having a radically polymerizable unsaturated group in the molecule, for example, epoxy (meth) acrylate-based, urethane (meth) acrylate-based, polyester (meth) acrylate-based, or polyether (meth) acrylate. The system etc. can be mentioned. Further, as the polymerizable oligomer, a highly hydrophobic polybutadiene (meth) acrylate-based oligomer having a (meth) acrylate group on the side chain of the polybutadiene oligomer, and a silicone (meth) acrylate-based oligomer having a polysiloxane bond on the main chain. In molecules such as aminoplast resin (meth) acrylate-based oligomers modified from aminoplast resins having many reactive groups in small molecules, novolak type epoxy resins, bisphenol type epoxy resins, aliphatic vinyl ethers, aromatic vinyl ethers, etc. There are oligomers and the like having cationically polymerizable functional groups.

Along with the polyfunctional (meth) acrylate and the like, a monofunctional (meth) acrylate can be appropriately used in combination as long as the object of the present invention is not impaired for the purpose of reducing the viscosity thereof. One of these monofunctional (meth) acrylates may be used alone, or two or more thereof may be used in combination.

The thickness of the surface protective layer 15 is preferably 2 μm or more and 25 μm or less, more preferably 2 μm or more and 15 μm or less, from the viewpoint of obtaining excellent scratch resistance and its durability, as well as surface characteristics such as abrasion resistance and chemical resistance. , Even more preferably 2 μm or more and 10 μm or less.

Various additives other than the above can be contained in the resin composition forming the surface protective layer 15 as long as the performance is not impaired. Examples of various additives include polymerization inhibitors, cross-linking agents, antistatic agents, adhesive improvers, antioxidants, leveling agents, tixogenic agents, coupling agents, plasticizers, defoamers, fillers, and solvents. And so on.

(Adhesive layer)
The decorative sheet 10 can have an adhesive layer, if necessary. For example, in order to improve the adhesiveness between the second dark color layer 13 and the transparent resin layer 14, an adhesive layer can be provided between the second dark color layer 13 and the transparent resin layer 14. As the adhesive constituting the adhesive layer, an adhesive generally used in a decorative sheet can be appropriately selected and used, and the thickness thereof is usually 0.1 μm or more and 50 μm or less, which is sufficient. From the viewpoint of obtaining adhesiveness, it is preferably 1 μm or more and 30 μm or less.

The adhesive is not particularly limited, and examples thereof include urethane-based adhesives, acrylic-based adhesives, epoxy-based adhesives, and rubber-based adhesives. Among them, urethane-based adhesives have adhesive strength. It is preferable in that. As such a urethane-based adhesive, for example, a two-component curable type containing various polyol compounds such as polyether polyol, polyester polyol, and acrylic polyol and various polyisocyanate compounds such as tolylene diisocyanate and hexamethylene diisocyanate. An adhesive using a urethane resin can be mentioned. Acrylic-polyester-vinyl acetate resin and the like are also suitable adhesives that easily develop adhesiveness by heating and can maintain adhesive strength even when used at high temperatures. The adhesive layer can be formed by a known layer forming method such as a coating method using an adhesive composition made of these resins or the like.

(Primer layer)
The decorative sheet 10 may have a primer layer and a back surface primer layer in either of the layers in order to improve the adhesion between the layers, if necessary. For example, by providing a primer layer as a back surface primer layer on the base sheet 11 side between the adherend and the base sheet 11, a decorative member having excellent interlayer adhesion can be obtained. Further, by providing the primer layer between the transparent resin layer 14 and the surface protective layer 15, excellent scratch resistance of the decorative member can be obtained.

The primer layer is a transparent or translucent layer, and can be formed by using, for example, a resin exemplified as a binder resin for ink. The thickness of the primer layer is usually 0.5 μm or more and 20 μm or less, preferably 0.5 μm or more and 5 μm or less, and more preferably 0.5 μm or more and 3 μm or less.

(Concave shape)
The decorative sheet 10 preferably has a concave shape at least on the surface protective layer 15. Since the decorative sheet 10 has a concave shape, the texture (tactile sensation) is particularly excellent. This concave shape may be present at least in the surface protective layer 15, and may reach the base sheet 11. From the viewpoint of obtaining an excellent texture (tactile sensation), not only those that stay in the surface protective layer 15, but also those that reach the transparent resin layer 14, those that reach the first dark layer 12 and the second dark layer 13, and the base sheet 11 It is preferable that all of them are combined. In the present specification, when the surface protective layer 15 or the like has the concave shape, the thickness of the surface protective layer 15 or the like means the thickness measured at a place having no concave shape.

The maximum depth of the concave shape is preferably 15% or more and less than 100%, more preferably 15% or more and 80% or less, and even more preferably 25% or more and 80% or less with respect to the total thickness of the decorative sheet 10. The maximum depth of the concave shape is preferably 15 μm or more, more preferably 20 μm or more, and further preferably 30 μm or more. By having such a maximum depth, the decorative sheet 10 is not broken during concave shape processing, for example, embossing, and the concave shape is not finished as if it is crushed, which is excellent. A texture (tactile sensation) is obtained, and as a result, excellent designability is obtained.

Here, the maximum depth of the concave shape is measured by using a surface roughness shape measuring machine to measure the height from the lowest point of the concave shape to the surface of the surface protection layer 15 for any 30 concave shapes. Then, the cutoff value was 2.50 mm, the type of cutoff filter was 2RC, and the inclination correction method was measured under straight line measurement conditions, and the deepest one was taken as the maximum depth.

There is no particular limitation on the method of forming the concave shape on the surface protective layer 15, and for example, considering the ease of work, it is preferable to adopt embossing. The embossing may be performed by a usual method using a known single-wafer or rotary embossing machine.

(Manufacturing method of decorative sheet)
The method for producing a decorative sheet of the present invention will be described by taking the decorative sheet 10 according to the embodiment of the present invention as an example. The decorative sheet 10 includes, for example, (a) a step of forming a first dark color layer 12 on the base material sheet 11, (b) a step of forming a second dark color layer 13 on the first dark color layer 12, and (c) a first step. 2 By sequentially going through a step of forming a transparent resin layer 14 on the dark color layer 13 and a step of (d) applying a curable resin composition on the transparent resin layer 14 and curing it to form a surface protective layer 15. Can be manufactured.

The step (a) is a step of providing the first dark color layer 12 on the base sheet 11. The first dark color layer 12 can be formed, for example, by applying ink on the base sheet 11 and drying it. The ink is preferably applied by a gravure printing method.

When the base sheet 11 is surface-treated, the base sheet 11 may be surface-treated before the first dark color layer 12 is formed. When the primer layer is provided between the base sheet 11 and the first dark color layer 12, the plasticer layer may be provided before forming the first dark color layer 12. When the back surface primer layer is provided on the surface of the base sheet 11 on the second main surface S2 side, the back surface primer layer may be provided before, during, or after the formation of the first dark color layer 12. The primer layer is formed by applying a resin composition for forming a primer layer by a known method such as a gravure printing method, a bar coating method, a roll coating method, a reverse roll coating method, or a comma coating method. Can be done.

The step (b) is a step of forming the second dark color layer 13 on the first dark color layer 12. The second dark color layer 13 can be formed, for example, by applying ink on the first dark color layer 12 and drying it. The ink is preferably applied by a gravure printing method.

The step (c) is a step of providing the transparent resin layer 14 on the second dark color layer 13. The transparent resin layer 14 has a resin composition that forms the transparent resin layer 14 after the base sheet 11 having the first dark color layer 12 and the second dark color layer 13 is coated with an adhesive as necessary to form an adhesive layer. The transparent resin layer 14 can be formed by adhering and crimping the transparent resin layer 14 by a method such as extrusion lamination, dry lamination, wet lamination, thermal lamination, or the like, and laminating them.

The step (d) is a step of applying the curable resin composition on the transparent resin layer 14 and curing it to form the surface protective layer 15. The surface protective layer 15 is cured by applying an ionizing radiation curable resin composition containing an ionizing radiation curable resin onto the transparent resin layer 14 or a primer layer provided on the transparent resin layer 14 as desired. You can get it.

The resin composition for forming the surface protective layer 15 is preferably applied with a gravure coat, a bar coat, a roll coat, a reverse roll coat, and a comma coat so that the thickness after curing is usually 1 μm or more and 20 μm or less. It is performed by a known method such as, more preferably by a gravure coat.

When an ionizing radiation resin composition is used to form the surface protective layer 15, the uncured resin layer formed by applying the resin composition is made into a cured product by irradiating ionizing radiation such as electron beam and ultraviolet rays. , The surface protective layer 15. Here, when an electron beam is used as ionizing radiation, the acceleration voltage thereof can be appropriately selected according to the resin to be used and the thickness of the layer, but the uncured resin layer is usually cured at an acceleration voltage of about 70 to 300 kV. Is preferable.

The irradiation dose is preferably an amount at which the crosslink density of the ionizing radiation curable resin is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 50 kGy (1 to 5 Mrad). The electron beam source is not particularly limited, and for example, various electron beam accelerators such as cockloft Walton type, bandegraft type, resonance transformer type, insulated core transformer type, linear type, dynamitron type, and high frequency type are used. can do. When ultraviolet rays are used as ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. The ultraviolet source is not particularly limited, and for example, a high-pressure mercury lamp, a low-pressure mercury lamp, a metal halide lamp, a carbon arc lamp, or the like is used.

When a thermosetting resin composition is used for forming the surface protective layer 15, the surface protective layer 15 may be formed by performing a heat treatment according to the resin composition to be used and curing the surface protective layer 15.

The decorative sheet obtained as described above can exhibit a dark color and exhibit heat shielding performance. Therefore, for example, in a form laminated with an adherend, a wall, a ceiling, a floor, a balcony, a veranda, etc. Surface decorative boards for interior or exterior members of buildings such as; window frames, doors, handrails, pavements, surrounding edges, surface decorative boards for fittings such as moldings; kitchens, furniture, light electrical equipment, OA equipment, etc. Surface veneer for cabinets; Surface veneer for interior or exterior of vehicles; Surface veneer for communication devices such as mobile phones; Surface veneer for paved roads such as roadways and sidewalks (laminated on the paved surface of paved roads) It can be suitably used as a decorative member for various purposes such as a surface decorative board for imparting color, pattern, etc.).

[Cosmetic material]
Hereinafter, the decorative member according to the embodiment of the present invention will be described with reference to FIG. FIG. 2 is a side view schematically showing a configuration of a decorative member according to an embodiment of the present invention.

As shown in FIG. 2, in the decorative member 20 according to the embodiment of the present invention, the adherend 21 and the decorative sheet 10 are opposed to each other so that the adherend 21 and the base sheet 11 of the decorative sheet 10 face each other. Be prepared.

The average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the surface of the decorative member 20 on the decorative sheet 10 side (that is, the first main surface S1 of the decorative sheet 10) with light having a wavelength range of 781 nm or more and 2500 nm or less is It is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more. As a result, the decorative member 20 can more effectively exhibit the heat shielding performance based on the near infrared reflection performance. The upper limit of the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the decorative member 20 is not particularly limited, but is, for example, 95%, 90% or 85%.

The average spectral reflectance of the wavelength range of 360 nm or more and 780 nm or less measured by irradiating the surface of the decorative member 20 on the decorative sheet 10 side (that is, the first main surface S1 of the decorative sheet 10) with light having a wavelength range of 360 nm or more and 780 nm or less is It is preferably 10% or less, more preferably 9% or less, and even more preferably 8% or less. As a result, the decorative member 20 can more effectively exhibit a dark color. The lower limit of the average spectral reflectance in the wavelength range of 360 nm or more and 780 nm or less in the decorative member 20 is not particularly limited, but is, for example, 1%, 2%, or 3%.

(Adhesion material)
Examples of the adherend 21 include flat plates of various materials, plate materials such as curved plates, three-dimensional articles, sheets (or films), and the like. Specifically, board materials such as wood single board, wood plywood, particle board, MDF (medium density fiberboard) and other wood fiber boards and wood members used as three-dimensional articles; board materials such as iron and aluminum and steel plates , Three-dimensional shaped articles, metal members used as sheets, etc .; ceramics such as glass and ceramics, non-cement ceramic materials such as gypsum, non-ceramic ceramic materials such as ALC (lightweight cellular concrete) plates and solids Ceramic members used as shape articles, etc .; polyolefin resins such as acrylic resin, polyester resin, polystyrene resin, polypropylene, ABS (acrylonitrile-butadiene-styrene copolymer) resin, phenol resin, vinyl chloride resin, cellulose resin, Examples thereof include plate materials such as rubber, three-dimensional articles, resin members used as sheets and the like. In addition, these members may be used alone or in combination of two or more.

The adherend 21 may be appropriately selected from the above depending on the intended use, and may be used for interior / exterior members of buildings such as walls, ceilings, and floors, window frames, doors, handrails, skirting boards, peripheral edges, moldings, and the like. When the fitting is used, a wooden member, a metal member, a resin member, and a member in which these are combined are preferable.

As the adherend 21, it is preferable to use an adherend having a wavelength range of 781 nm or more and 2500 nm or less and having a high average spectral reflectance. When the average spectral reflectance in the near infrared region of the adherend 21 is high, the decorative member 20 can more effectively exhibit the heat shielding performance based on the near infrared reflection performance. The average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the adherend 21 is preferably 50% or more, more preferably 55% or more, and even more preferably 60% or more. The upper limit of the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the adherend 21 is not particularly limited, but is, for example, 95%, 90% or 85%. The measurement of the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the adherend 21 is performed in the same manner as the average spectral reflectance in the wavelength range of 781 nm or more and 2500 nm or less in the base material sheet.

The spectral reflectance of the adherend 21 can be adjusted, for example, by coating the surface of the adherend 21 with a colorant. When the adherend 21 is made of resin, it can be adjusted by appropriately selecting the type of resin, the thickness of the adherend, the type and amount of the colorant contained in the adherend, and the like. it can.

The colorant may be appropriately selected depending on the intended use. For example, the adherend 21 can be colored transparent or colored opaque. Generally, from the viewpoint of hiding the surface of the adherend 21, it is preferable to make it colored and opaque. Specific examples of the colorant used in the adherend 21 are the same as those described above with respect to the colorant contained in the base sheet 11. From the viewpoint of realizing the excellent heat shielding performance of the decorative member 20, the adherend 21 is preferably colored white (that is, contains a white pigment or is coated with a white pigment).

The thickness of the adherend 21 can be appropriately adjusted according to the application and the material, but is preferably 0.1 mm or more and 5 mm or less, and more preferably 0.1 mm or more and 3 mm or less.

(Adhesive layer)
The decorative member 20 has an adhesive layer 22 between the adherend 21 and the decorative sheet 10. The adhesive layer 22 is a layer provided as needed and can be omitted, but in order to obtain excellent adhesiveness, the adherend 21 and the decorative sheet 10 are bonded to each other via the adhesive layer 22. Is preferable.

The adhesive contained in the adhesive layer 22 is not particularly limited, and examples thereof include adhesives such as heat-sensitive adhesives and pressure-sensitive adhesives. Examples of the resin constituting the adhesive include acrylic resin, polyurethane resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, styrene-acrylic copolymer resin, and polyester resin. , Polyamide-based resin and the like. A two-component curable polyurethane-based adhesive or polyester-based adhesive using isocyanate or the like as a curing agent can also be applied. An adhesive may also be used for the adhesive layer 22. Examples of the pressure-sensitive adhesive include acrylic-based, urethane-based, silicone-based, and rubber-based pressure-sensitive adhesives.

The adhesive layer 22 is formed by applying and drying the resin in a form that can be applied such as a solution or an emulsion by a means such as a gravure printing method, a screen printing method, or a reverse coating method using a gravure plate. be able to. The thickness of the adhesive layer is not particularly limited, but is usually 1 μm or more and 100 μm or less. Within this range, excellent adhesiveness can be obtained.

(Manufacturing method of decorative parts)
The method for manufacturing the decorative member of the present invention will be described by taking the decorative member 20 according to the embodiment of the present invention as an example. The decorative member 20 can be manufactured through a step of laminating the decorative sheet 10 and the adherend 21 with the base sheet 11 of the decorative sheet 10 and the adherend 21 facing each other (d).

Examples of the method of laminating the adherend 21 and the decorative sheet 10 include a laminating method of laminating the decorative sheet 10 on a plate-shaped adherend with a pressure roller with an adhesive in between, and an adhesive. A wrapping process in which the decorative sheet 10 is sequentially pressure-bonded and laminated on a plurality of side surfaces constituting the adherend 21 by a plurality of rollers having different orientations while supplying the decorative sheet 10 through the space. , The decorative sheet 10 fixed to the fixed frame is heated by a heater via a silicone rubber sheet until it reaches a predetermined temperature at which it softens, and the vacuum forming die is pressed against the heated and softened decorative sheet 10 at the same time from the vacuum forming die. A vacuum forming process or the like in which air is sucked by a vacuum pump or the like and the decorative sheet 10 is firmly adhered to the vacuum forming die is preferably mentioned.

When a hot melt adhesive (heat-sensitive adhesive) is used in laminating or wrapping, the heating temperature is usually 160 ° C or higher and 200 ° C or lower, depending on the type of resin that composes the adhesive, and is reactive. When a hot melt adhesive is used, the heating temperature is usually 100 ° C. or higher and 130 ° C. or lower. Further, in the case of vacuum forming, it is generally performed while heating, and the heating temperature is usually 80 ° C. or higher and 130 ° C. or lower, preferably 90 ° C. or higher and 120 ° C. or lower.

The decorative member obtained as described above can be further arbitrarily cut, and the surface and the end of the wood can be arbitrarily decorated by grooving, chamfering, etc. using a cutting machine such as a router or a cutter. And various uses, for example, surface decorative boards of interior members or exterior members of buildings such as walls, ceilings, floors, balconies, verandas; fittings such as window frames, doors, door frames, handrails, pavements, and surroundings. Surface veneer for edges, moldings, fences, fences, etc .; Cabinet surface veneer for kitchen equipment, furniture, light electrical equipment, OA equipment, etc.; Surface veneer for vehicle interior or exterior; mobile phones, etc. Surface decorative board of communication equipment; It can be used as a surface decorative board for paved roads such as roads and sideways (a surface decorative board for laminating on the paved surface of a paved road to give color, pattern, etc.).

Hereinafter, the present invention will be described in more detail based on examples.

[Example 1] Manufacture and evaluation of decorative sheet 1. Preparation of base sheet As the base sheet, a polypropylene (PP) resin sheet having been subjected to corona discharge treatment on both sides was prepared. This PP resin sheet is a colored resin sheet (thickness: 60 μm) colored white, which contains only 10 parts by mass of titanium oxide as a pigment with respect to 100 parts by mass of PP resin.

In the state where the base sheet is present alone (that is, no layer is laminated on both sides of the base sheet), each wavelength in the base sheet has a wavelength range of 360 nm or more and 2500 nm or less (that is, wavelengths 360 nm and 361 nm). , 362 nm, ... 2498 nm, 2499 nm, 2500 nm) spectral reflectance (%) was measured. For the spectral reflectance (%) of each wavelength, a spectrophotometer (V-670 manufactured by Nippon Spectral Co., Ltd.) conforming to JIS K 0115: 2004 was used, and the light of each wavelength was incident on the surface of the base sheet at an incident angle of 5. The light was irradiated at a degree (the normal direction of the surface of the base sheet was 0 degree), and the ratio of the total reflected light beam to the parallel incident light beam (that is, the total light reflectance) was measured. The method for measuring the total light reflectance was based on JIS K 7375: 2008.

The spectral reflectance curve in the wavelength range of 360 nm or more and 2500 nm or less in the base sheet is shown in FIG.
The average spectral reflectance of the base sheet in the wavelength range of 781 nm or more and 2500 nm or less is 52.7%, the average spectral reflectance of the wavelength range of 360 nm or more and 780 nm or less is 78.5%, and the spectral reflectance of the wavelength range of 750 nm is 82.0%. The spectral reflectance at a wavelength of 800 nm was 80.5%.

2. 2. Formation of the first dark color layer As the first printing ink, an ink containing a binder resin (two-component curable acrylic-urethane resin), iron oxide pigment (Fe ₂ O ₃ , brown pigment) and copper phthalocyanine blue (blue pigment) is used. Got ready. In the first printing ink, the total concentration of solid content is 30% by mass, the total concentration of iron oxide pigment and copper phthalocyanine blue is 11.5% by mass, and the mass ratio of iron oxide pigment to copper phthalocyanine blue (iron oxide type). Pigment mass: mass of copper phthalocyanine blue) was 1: 0.25.
The first printing ink is applied to one surface of the base sheet by a gravure printing method (coating amount: about 2 g / m ^{2 based} on solid content), cured, and the first dark color layer (thickness after curing: about 2 μm). ) Was formed.

3. 3. Formation of the second dark color layer As the second printing ink, a binder resin (one-component curable acrylic-urethane resin) and an azomethine azo black pigment having an average particle size of 0.2 μm (Chromofine Black A-1103 manufactured by Dainichi Seika Kogyo Co., Ltd.) ) Is included in the printing ink. The content of the azomethine azo black pigment in the second printing ink is 25% by mass based on the solid content. The P / V ratio (mass of azomethine azo black pigment / mass of binder resin) in the second printing layer is 0.25.
The second printing ink is applied to the upper surface of the first dark color layer by a gravure printing method (coating amount: about 2 g / m ^{2 based} on solid content), cured, and the second dark color layer (thickness after curing: about 2 μm). Was formed.

4. Formation of Backside Primer Layer A two-component curable urethane-nitrocellulose mixed resin composition was applied to the other surface of the base sheet and dried to form a backside primer layer (thickness after drying: about 2 μm).

5. Formation of Adhesive Layer A transparent polyurethane resin-based adhesive was applied onto the second dark-colored layer and dried to form an adhesive layer (thickness after drying: 3 μm).

6. Formation of transparent resin layer A transparent polypropylene resin was heated, melted and extruded on the adhesive layer by a T-die extruder to form a transparent resin layer (thickness: about 80 μm) as a transparent resin layer.

In the same manner as above, the transparent resin layer is formed independently, and in a state where the transparent resin layer is present alone (that is, no layer is laminated on both sides of the transparent resin layer), L ^* a ^*. L ^* , a ^* and b ^* in the b ^* color system were measured. L ^* a ^* b ^* L ^* , a ^* and b ^* in the color system use a spectrophotometer (SE6000 manufactured by Nippon Denshoku Industries Co., Ltd.) to incident on the surface of the transparent resin layer at an angle of 10 degrees (10 degrees). Light (D65 light source) was irradiated with light (with the normal direction of the surface of the transparent resin layer set to 0 degrees), and measurement was performed based on total light reflected light (specular reflected light + diffuse reflected light). The measurement was performed at three points on the surface of the transparent resin layer. The measurement results are shown in Table 1.

7. Formation of Primer Layer After corona discharge treatment is applied to the surface of the transparent resin layer, a two-component curable acrylic-urethane resin composition is applied to the surface of the corona discharge treatment by a gravure printing method, dried, and the primer layer (after drying) is applied. Thickness: about 1 μm) was formed.

8. Formation of surface protective layer A transparent electron beam curable resin composition (electron beam curable resin: trifunctional urethane acrylate) is applied to the surface of the primer layer by a gravure coating method (solid content: about 3 g / m ² ) and dried. The uncured resin layer is formed, and the uncured resin layer is cured by irradiating an electron beam (pressurized voltage: 125 KeV, 5Mrad) in an environment with an oxygen concentration of 200 ppm to cure the surface protective layer (thickness: about: about). 3 μm) was formed.

9. Embossing The decorative sheet of Example 1 was obtained by embossing from the surface protective layer side to form an uneven pattern of a wood grain conduit pattern having a concave shape with a maximum depth of 30 μm. The features of the decorative sheet of Example 1 are shown in Table 2.

10. Evaluation of Decorative Sheet The following evaluation was performed on the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Example 1.

[Measurement of L ^* , a ^* and b ^* ]
Before or after performing a weather resistance test on a decorative sheet, a spectrocolorimeter (SE6000 manufactured by Nippon Denshoku Industries Co., Ltd.) was used to enter an angle of 10 degrees on the surface of the decorative sheet on the surface protective layer side (the surface of the decorative sheet). Light (D65 light source) was irradiated with light (the normal direction of the surface on the protective layer side is 0 degrees), and measurement was performed based on total light reflected light (specular reflected light + diffuse reflected light).

[Calculation of color difference ΔE]
L ^* a ^* b ^* color system L ^* , a ^* and b ^* measured by irradiating the surface of the decorative sheet on the surface protective layer side before the weather resistance test with L ₁ ^* , a ₁ ^* and b ^* , respectively. Let b ₁ ^*, and L ^* a ^* b ^* color-based L ^* , a ^*, and b ^* measured by irradiating the surface of the decorative sheet after the weather resistance test with light to L ₂ ^* , respectively ^. , A ₂ ^* and b ₂ ^* , ΔE = ((L ₂ ^* −L ₁ ^* ) ² + (a ₂ ^* −a ₁ ^* ) ² + (b ₂ ^* −b ₁ ^* ) ² ) ^{1 / The} color difference ΔE defined in ² was calculated.

[Measurement of spectral absorption rate]
The spectral reflectance (%) of each wavelength in the wavelength range of 360 nm or more and 2500 nm or less (that is, wavelengths of 360 nm, 361 nm, 362 nm, ... 2498 nm, 2499 nm, 2500 nm) is determined before or after performing a weather resistance test on a decorative sheet. , JIS K 0115: 2004 using a spectrophotometer (V-670 manufactured by JASCO Corporation) to the surface of the decorative sheet with an incident angle of 5 degrees (the normal direction of the surface of the decorative sheet is 0). Light of each wavelength was irradiated at (degree), and the ratio of the total reflected light beam to the parallel incident light beam (that is, the total light reflectance) was measured. The method for measuring the total light reflectance was based on JIS K 7375: 2008. The spectral reflectance (%) of each wavelength was measured in a state where no layer was laminated on both sides of the decorative sheet.

The average spectral reflectance (%) in the wavelength range of 360 nm or more and 780 nm or less is the spectral reflectance (%) of each wavelength in the wavelength range of 360 nm or more and 780 nm or less (that is, wavelengths 360 nm, 361 nm, 362 nm, ... 778 nm, 779 nm, 780 nm). ) Was measured, and the sum of the measured spectral reflectances of the 421 pieces was calculated by dividing by 421.

The average spectral reflectance (%) in the wavelength range of 781 nm or more and 2500 nm or less is the spectral reflectance (that is, wavelengths of 781 nm, 782 nm, 783 nm, ... 2498 nm, 2499 nm, 2500 nm) of each wavelength in the wavelength range of 781 nm or more and 2500 nm or less. %) Was measured, and it was calculated by dividing the sum of the measured 1720 spectral reflectances by 1720.

The weather resistance test for the decorative sheet is performed using a sunshine carbon arc lamp type weather resistance tester (Sunshine Weatherometer S300 manufactured by Suga Test Instruments Co., Ltd.) conforming to JIS B 7753: 2007, JIS K 5600-7- It was carried out for 4000 hours under the conditions according to 7:2008. The conditions of the weather resistance test are as follows.
Discharge voltage: 50 ± 2V
Discharge current: 60 ± 2A
Glass filter: A type Black panel temperature: 63 ± 3 ° C
Water injection conditions:
Pressure: 0.08 to 0.13 MPa
Water volume: 2100 + 100 mL / min Injection time: 18 minutes / 120 minutes Irradiation Water quality: pH 6.8
Water temperature: 16 ± 5 ° C
Relative humidity: 90 ± 5% (during condensation), 50 ± 5% (during irradiation)
Sample surface irradiance: 255 W / m ² (continuous irradiation at 300 to 400 nm)
1 cycle: 120 minutes (102 minutes of irradiation followed by 18 minutes of irradiation and injection)
Number of cycles: 2000 cycles

[Example 2]
Same as Example 1 except that the mass ratio of the iron oxide pigment to the copper phthalocyanine blue (mass of the iron oxide pigment: mass of the copper phthalocyanine blue) was adjusted to 1: 0.58 in the first printing ink. The cosmetic sheet of Example 2 was obtained. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Example 2. The decorative sheet of Example 2 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Example 2.

[Example 3]
The same as in Example 1 except that the mass ratio of the iron oxide pigment to the copper phthalocyanine blue (mass of the iron oxide pigment: mass of the copper phthalocyanine blue) was adjusted to 1: 0.11. The cosmetic sheet of Example 3 was obtained. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Example 3. The decorative sheet of Example 3 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Example 3.

[Example 4]
In the second printing ink, the same operation as in Example 1 was performed except that a perylene-based black pigment (manufacturer: Pariogen Black FK4280 manufactured by BASF) was used instead of the azomethine-azo black pigment, and the makeup of Example 4 was applied. I got a sheet. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Example 4. The decorative sheet of Example 4 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Example 4.

[Comparative Example 1]
The same operation as in Example 1 was performed except that the same ink as the first printing ink was used as the second printing ink to obtain a decorative sheet of Comparative Example 1. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 1. The decorative sheet of Comparative Example 1 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 1.

[Comparative Example 2]
In the first printing ink, azomethine azo black pigment was used instead of copper phthalocyanine blue (blue pigment) and iron oxide pigment (brown pigment), and in the first printing ink, the total solid content was 25. The same operation as in Example 1 was carried out except that the concentrations of mass% and azomethine azo black pigment were adjusted to 7.0 mass% to obtain a decorative sheet of Comparative Example 2. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 2. The decorative sheet of Comparative Example 2 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 2.

[Comparative Example 3]
In the first printing ink, azomethine azo black pigment and composite oxide black pigment were used instead of copper phthalocyanine blue (blue pigment) and iron oxide pigment (brown pigment), and in the first printing ink, The total concentration of solid content is 32.5% by mass, the total concentration of azomethine azo black pigment and composite oxide black pigment is 14.1% by mass, and the mass ratio of azomethin azo black pigment to composite oxide black pigment (azomethin azo). The same operation as in Example 1 was carried out except that the mass of the black pigment based on the pigment: the mass of the black pigment based on the composite oxide was adjusted to 1: 1 to obtain a decorative sheet of Comparative Example 3. The composite oxide-based black pigment used is a composite oxide-based black pigment containing manganese element, calcium element and titanium element (MPT-370 manufactured by Ishihara Sangyo Co., Ltd.). Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 3. The decorative sheet of Comparative Example 3 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 3.

[Comparative Example 4]
In the first printing ink, benzimidazolone (brown pigment) was used instead of the iron oxide pigment (brown pigment), and in the first printing ink, the mass ratio of benzimidazolone to copper phthalocyanine blue ( The same operation as in Example 1 was carried out except that the mass of benzimidazolone: mass of copper phthalocyanine blue) was adjusted to 1: 1 to obtain a decorative sheet of Comparative Example 4. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 4. The decorative sheet of Comparative Example 4 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 4.

[Comparative Example 5]
The same operation as in Example 1 was performed except that the first printing ink did not contain copper phthalocyanine blue (blue pigment) but only iron oxide pigment (brown pigment), and the cosmetic of Comparative Example 5 was used. I got a sheet. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 5. The decorative sheet of Comparative Example 5 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 5.

[Comparative Example 6]
The same operation as in Example 1 was performed except that the first printing ink contained only copper phthalocyanine blue (blue pigment) without containing an iron oxide pigment (brown pigment), and Comparative Example 6 I got a decorative sheet. Table 2 shows the characteristics of the first dark color layer and the second dark color layer of the decorative sheet of Comparative Example 6. The decorative sheet of Comparative Example 6 was evaluated in the same manner as the decorative sheet of Example 1. Table 3 shows the evaluation results of the decorative sheet of Comparative Example 6.

As shown in Table 3, the decorative sheets of Examples 1 to 4 are
(A) L ^* a ^* b ^* color-based L ^* , a ^* and b ^* measured by irradiating the surface of the decorative sheet on the surface protective layer side with light are L ₁ ^* , a ₁ ^* and b _{1 respectively.} ^* , After performing a weather resistance test on the decorative sheet, the surface of the decorative sheet after the weather resistance test is irradiated with light to measure L ^* a ^* b ^* color-based L ^*. , A ^* and b ^* are L ₂ ^* , a ₂ ^* and b ₂ ^* , respectively.
(A1) L ₁ ^* is 30 or less,
(A2) a ₁ ^* is -1.5 or more and 1.5 or less,
(A3) b ₁ ^* is −2.0 or more and 1.3 or less, and (A4) ΔE = ((L ₂ ^* −L ₁ ^* ) ² + (a ₂ ^* −a ₁ ^* ) ² + (b ₂ ^*) −B ₁ ^* ) ² ) The color difference ΔE defined by ^1/2 is less than 4.
(B) The average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the first main surface of the decorative sheet with light having a wavelength range of 781 nm or more and 2500 nm or less is 35% or more.
Satisfy the condition. Therefore, the decorative sheets of Examples 1 to 4 can continuously exhibit black color and can exhibit heat shielding performance.

As shown in Table 3, the decorative sheets of Comparative Examples 1 to 6 do not satisfy the condition of any one or more of (A1) to (A4) and (B). Therefore, the decorative sheets of Comparative Examples 1 to 6 cannot continuously exhibit black color or exhibit heat shielding performance.

10 ... Decorative sheet S1 ... First main surface of the decorative sheet S2 ... Second main surface of the decorative sheet 11 ... Base sheet 12 ... First dark color layer 13 ... Second dark color Layer 14 ... Transparent resin layer 15 ... Surface protection layer 20 ... Decorative member 21 ... Adhesive material 22 ... Adhesive layer

Claims (14)

It has a first main surface and a second main surface located on the opposite side of the first main surface.
A decorative sheet comprising a base sheet, a first dark color layer, and a second dark color layer in order from the second main surface side.
The first dark color layer contains an iron oxide pigment and a blue pigment,
The second dark layer contains a black pigment and
L * a * b * color system L * , a * and b * measured by irradiating the first main surface of the decorative sheet with light are designated as L 1 * , a 1 * and b 1 * , respectively. After performing a weather resistance test on the decorative sheet under the following conditions, the first main surface of the decorative sheet after the weather resistance test is irradiated with light and measured. L * a * b * Color system L *, a * and b *, respectively L 2 *, when the a 2 * and b 2 *, L 1 * is 30 or less, a 1 * is -1.5 to 1.5, b 1 * is - 2.0 or more and 1.3 or less, and ΔE = ((L 2 * −L 1 * ) 2 + (a 2 * −a 1 * ) 2 + (b 2 * −b 1 * ) 2 ) 1/2 The color difference ΔE defined by is less than 4,
The decorative sheet having an average spectral reflectance of 35% or more in a wavelength range of 781 nm or more and 2500 nm or less, which is measured by irradiating the first main surface of the decorative sheet with light having a wavelength range of 781 nm or more and 2500 nm or less.
[Conditions for weather resistance test]
Weather resistance tester: Suga Test Instruments Co., Ltd. Sunshine Weather Ometer S300
Test time: 4000 hours Discharge voltage: 50 ± 2V
Discharge current: 60 ± 2A
Glass filter: A type Black panel temperature: 63 ± 3 ° C
Water injection conditions:
Pressure: 0.08 to 0.13 MPa
Water volume: 2100 + 100 mL / min Injection time: 18 minutes / 120 minutes Irradiation Water quality: pH 6.8
Water temperature: 16 ± 5 ° C
Relative humidity: 90 ± 5% (during condensation), 50 ± 5% (during irradiation)
Sample surface irradiance: 255 W / m 2 (continuous irradiation at 300 to 400 nm)
1 cycle: 120 minutes (102 minutes of irradiation followed by 18 minutes of irradiation and injection)
Number of cycles: 2000 cycles The decorative sheet according to claim 1, wherein L 2 * is 30 or less, a 2 * is 0 or more and 2.5 or less, and b 2 * is -2.5 or more and 0.5 or less. The invention according to claim 1 or 2, wherein the average spectral reflectance of the wavelength range of 360 nm or more and 780 nm or less measured by irradiating the first main surface of the decorative sheet with light having a wavelength range of 360 nm or more and 780 nm or less is 10% or less. Cosmetic sheet. The spectral reflectance at a wavelength of 750 nm measured by irradiating the first main surface of the decorative sheet with light having a wavelength of 750 nm is 30% or less, and the first main surface of the decorative sheet is irradiated with light having a wavelength of 800 nm. The decorative sheet according to claim 3, wherein the measured spectral reflectance at a wavelength of 800 nm is 55% or more. The decorative sheet according to any one of claims 1 to 4, wherein the black pigment is an infrared transmissive pigment. The decorative sheet according to claim 5, wherein the infrared transmissive pigment is selected from an azomethine azo pigment and a perylene black pigment. The decorative sheet according to any one of claims 1 to 6, wherein the blue pigment is a phthalocyanine pigment. In a state where the base sheet is present alone, the average spectral reflectance of the wavelength range of 781 nm or more and 2500 nm or less measured by irradiating the surface of the base sheet with light having a wavelength range of 781 nm or more and 2500 nm or less is 30% or more. The decorative sheet according to any one of claims 1 to 7. The decorative sheet according to any one of claims 1 to 8, wherein the base sheet is a colored resin sheet. Claims 1 to 9, further comprising a transparent resin layer provided on the first main surface side of the second dark color layer and a surface protective layer provided on the first main surface side of the transparent resin layer. The cosmetic sheet according to any one item. The decorative sheet according to claim 10, wherein the surface protective layer is a cured product of an ionizing radiation curable resin composition. A decorative member comprising an adherend and a decorative sheet according to any one of claims 1 to 11 so that the adherend and the base sheet of the decorative sheet face each other. The decorative member according to claim 12, wherein the adherend is at least one member selected from a wood member, a metal member, and a resin member. 12. Decorative material.

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