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US 2020/0071879 A1Published application
Napped artificial leather
AssigneeKuraray Co., Ltd.
InventorMasashi MEGURO
Life of this patent
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Abstract
A napped artificial leather including a non-woven fabric including ultrafine fibers and a polyurethane, the napped artificial leather including a napped surface formed by napping the ultrafine fibers on a surface thereof, wherein the napped surface has, after a Martindale abrasion test in accordance with JIS L 1096 (6.17.5E method, Martindale method) under a pressing load of 12 kPa and 50000 times of abrasions, a ratio of the polyurethane observed by a surface observation using an electron microscope in a portion that has been subjected to the Martindale abrasion test, of 4.0% or less.
Claims17
1:
- A napped artificial leather comprising a non-woven fabric comprising ultrafine fibers and a polyurethane, the napped artificial leather comprising a napped surface formed by napping the ultrafine fibers on a surface thereof,
- wherein the napped surface has, after a Martindale abrasion test in accordance with JIS L 1096 (6.17.5E method, Martindale method) under a pressing load of 12 kPa and 50000 times of abrasions, a ratio of the polyurethane observed by a surface observation using an electron microscope in a portion that has been subjected to the Martindale abrasion test, of 4.0% or less.
2:
- The napped artificial leather according to claim 1, wherein the napped surface has a density of peaks (Spd) having a height of 100 μm or more from an average height, of 25/432 mm2 or more, as measured in a surface roughness measurement in accordance with ISO 25178.
3:
- The napped artificial leather according to claim 1, wherein the ultrafine fibers have an average yarn toughness of 25.0 cN·dtex or less.
4:
- The napped artificial leather according to claim 1, wherein the ultrafine fibers comprise 0.1 to 10 mass % of a pigment.
5:
- The napped artificial leather according to claim 1, wherein the napped surface has an L* value (lightness) based on an L*a*b* color system, of 35 or less.
6:
- The napped artificial leather according to claim 1, wherein a difference ΔL* in an L* value (lightness) based on an L*a*b* color system in a portion of the napped surface that has been subjected to the Martindale abrasion test before and after the Martindale abrasion test is 6.0 or less.
7:
- The napped artificial leather according to claim 1, wherein the polyurethane comprises a first polyurethane impregnated into the non-woven fabric, and the first polyurethane has a content ratio of 15 mass % or less relative to a total amount of the non-woven fabric and the first polyurethane.
8:
- The napped artificial leather according to claim 7, wherein the first polyurethane is an aqueous polyurethane.
9:
- The napped artificial leather according to claim 7, wherein the polyurethane further comprises a second polyurethane unevenly distributed on the napped surface, and the second polyurethane has a 100% modulus of 4.5 to 12.5 MPa.
10:
- The napped artificial leather according to claim 9, wherein the second polyurethane is a solvent-based polyurethane.
11:
- A napped artificial leather comprising a non-woven fabric including ultrafine fibers and a polyurethane, the napped artificial leather including a napped surface formed by napping the ultrafine fibers on a surface thereof,
- wherein the napped surface has, after a Martindale abrasion test in accordance with JIS L 1096 (6.17.5E method, Martindale method) under a pressing load of 12 kPa and 50000 times of abrasions, a ratio of the polyurethane observed by a surface observation using an electron microscope in a portion that has been subjected to the Martindale abrasion test, of 4.0% or less,
- wherein the ultrafine fibers have an average yarn toughness of 25.0 cN·dtex or less and contain 0.1 to 10 mass % of a pigment, and
- wherein the napped surface has an L* value (lightness) based on an L*a*b* color system, of 35 or less.
1 more element
12:
- The napped artificial leather according to claim 11, wherein a difference ΔL* in an L* value (lightness) based on an L*a*b* color system in a portion of the napped surface that has been subjected to the Martindale abrasion test before and after the Martindale abrasion test is 6.0 or less.
13:
- The napped artificial leather according to claim 11, wherein the napped surface has a density of peaks (Spd) having a height of 100 μm or more from an average height, of 25/432 mm2 or more, as measured in a surface roughness measurement in accordance with ISO 25178.
14:
- The napped artificial leather according to claim 11,
- wherein the polyurethane comprises a first polyurethane impregnated into the non-woven fabric, and the first polyurethane is an aqueous polyurethane having a content ratio of 15 mass % or less relative to a total amount of the non-woven fabric and the first polyurethane, and
- the polyurethane further comprises a second polyurethane unevenly distributed on the napped surface, and the second polyurethane is a solvent-based polyurethane having a 100% modulus of 4.5 to 12.5 MPa.
15:
- A napped artificial leather comprising a non-woven fabric including ultrafine fibers and a polyurethane, the napped artificial leather including a napped surface formed by napping the ultrafine fibers on a surface thereof,
- wherein the napped surface has, after a Martindale abrasion test in accordance with JIS L 1096 (6.17.5E method, Martindale method) under a pressing load of 12 kPa and 50000 times of abrasions, a ratio of the polyurethane observed by a surface observation using an electron microscope in a portion that has been subjected to the Martindale abrasion test, of 4.0% or less,
- wherein the polyurethane comprises a first polyurethane impregnated into the non-woven fabric, and the first polyurethane is an aqueous polyurethane having a content ratio of 15 mass % or less relative to a total amount of the non-woven fabric and the first polyurethane, and
- the polyurethane further comprises a second polyurethane unevenly distributed on the napped surface, and the second polyurethane is a solvent-based polyurethane having a 100% modulus of 4.5 to 12.5 MPa.
1 more element
16:
- The napped artificial leather according to claim 15,
- wherein the ultrafine fibers have an average yarn toughness of 25.0 cN·dtex or less and contain 0.1 to 10 mass % of a pigment, and
- wherein the napped surface has an L* value (lightness) based on an L*a*b* color system, of 35 or less.
17:
- The napped artificial leather according to claim 15, wherein the napped surface has a density of peaks (Spd) having a height of 100 μm or more from an average height, of 25/432 mm2 or more, as measured in a surface roughness measurement in accordance with ISO 25178.