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US 2023/0416982 A1Published application
Leather-like sheet and backpack using the same as a back surface material
AssigneeKuraray Co., Ltd.
InventorsTetsuya ASHIDA, Kansai Hara
Life of this patent
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Abstract
Disclosed is a leather-dike sheet including a fiber base material and a colored resin layer laminated on the fiber base material, wherein the colored resin layer includes an intermediate layer and a skin layer laminated on the intermediate layer, wherein the skin layer is a layer containing polyurethane and a black pigment of 3 g/m2 or more, and the intermediate layer is a layer containing polyurethane and a black pigment, and in the L*a*b* color system, a leather-like sheet having a lightness value of L*≤30 is used.
Claims18
1:
- A leather-like sheet, comprising
- a fiber base material, and
- a colored resin layer laminated on the fiber base material,
- wherein the colored resin layer comprises an intermediate layer and a skin layer laminated on the intermediate layer,
- the skin layer is a layer containing polyurethane and 3 g/m2 or more of an infrared-reflective black pigment,
- the intermediate layer is a layer containing polyurethane and a black pigment, and
- the leather-like sheet has a surface having a lightness value of L*≤30 in the L*a*b* color system.
4 more elements
2:
- The leather-like sheet according to claim 1,
- wherein the reflectance with respect to a near-infrared ray of the wavelength of 905 nm is 10% or more, and a reflectance with respect to a near-infrared ray of the wavelength of 1550 nm is 10% or more.
3:
- The leather-like sheet according to claim 1,
- wherein the solar reflectance in the wavelength-range from 250 to 2500 nm is 10% or more on the average.
4:
- The leather-like sheet according to claim 1.
- wherein the infrared-reflective black pigment has a reflectance of 25% or more with respect to a near-infrared ray of the wavelength of 905 nm,
- a reflectance of 50% or more with respect to a near-infrared ray of the wavelength of 1550 nm, and
- a transmittance of less than 50% with respect to a near-infrared ray of the wavelength of 905 nm.
1 more element
5:
- The leather-like sheet according to claim 1,
- wherein the infrared-reflective black pigment is a titanium-based black pigment that is a CaO—TiO2—MnO2 base.
6:
- The leather-like sheet according to claim 1,
- wherein the skin layer contains 0 to 0.5 g/m2 of carbon black.
7:
- The leather-like sheet according to claim 1,
- wherein a reflection intensity of the surface is 30 or more, measured at the wavelength of 905 nm and the measurement distance 10 m, using a HORIZON manufactured by Livox Technology Company Limited.
8:
- A backpack, comprising the leather-like sheet according to claim 1 as a back surface material.
9:
- The leather-like sheet according to claim 1,
- wherein the skin layer contains 0 to 0.5 g/m2 of carbon black.
10:
- The leather-like sheet according to claim 1,
- wherein the skin layer does not contain carbon black.
11:
- The leather-like sheet according to claim 1,
- wherein the intermediate layer contains carbon black as the black pigment.
12:
- The leather-like sheet according to claim 1,
- wherein the thickness of the skin layer is from 10 to 30 μm.
13:
- The leather-like sheet according to claim 1,
- wherein the thickness of the intermediate layer is from 10 to 50 μm.
14:
- The leather-like sheet according to claim 1,
- further comprising a porous layer mainly composed of polyurethane having the thickness of 100 to 600 μm between the fiber base material and the colored resin layer.
15:
- A leather-like sheet, comprising:
- a fiber base material, and
- a colored resin layer laminated on the fiber base material,
- wherein the colored resin layer comprises an intermediate layer and a skin layer laminated on the intermediate layer,
- the skin layer is a layer containing poly urethane, 3 g/m2 or more of an infrared-reflective black pigment and 0 to 0.5 g/m2 of carbon black,
- the intermediate layer is a layer containing polyurethane and 0.2 g/m2 or more of carbon black, and
- the leather-like sheet has a surface having a lightness value of L*≤30 in the L*a*b* color system.
4 more elements
16:
- The leather-like sheet according to claim 15,
- wherein the infrared-reflective black pigment is a titanium-based black pigment that is a CaO—TiO2—MnO2 base.
17:
- The leather-like sheet according to claim 15,
- wherein the thickness of the skin layer is from 10 to 30 μm and the thickness of the intermediate layer is from 10 to 50 μm.
18:
- The leather-like sheet according to claim 15,
- wherein the skin layer does not contain carbon black.