Napped artificial leather

Patent metadata

Field	Value
Publication number	US-12043956-B2
Application number	US-201916964349-A
Country	US
Kind code	B2
Filing date	Feb 4, 2019
Priority date	Feb 19, 2018
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

Disclosed is a napped artificial leather including: a non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex; and an elastic polymer applied in the non-woven fabric, wherein the polyester fibers contain 0.5 to 10 mass % of a dark color pigment, the napped artificial leather has a napped surface on which the polyester fibers on at least one side thereof are napped, and the napped surface has a lightness L* value based on the L*a*b* color system, of ≤20, and the napped artificial leather has a peel strength of 3 kg/cm or more, and a grade of color difference, determined using a Grey scale for assessing staining in an evaluation of color migration to a multifiber adjacent fabric (co-woven fabric No. 1; the same applied to the following) during pressurization under heating in a wet state under a load of 4 kPa at 200° C. for 60 seconds, of 4 or more.

First claim

The invention claimed is:

1. A napped artificial leather comprising:
a non-woven fabric that is an entangled body of a fiber bundle of polyester fibers having an average fineness of from 0.07 to 0.5 dtex; and
an elastic polymer applied in the non-woven fabric,
wherein the polyester fibers comprise from more than 5 mass % to 10 mass % of a dark color pigment,
a content ratio of the elastic polymer is from 0.1 to 14 mass % in the napped artificial leather,
the elastic polymer comprises a first elastic polymer that is present outside the fiber bundle, and a second elastic polymer that is present inside the fiber bundle,
the napped artificial leather is not dyed, or is dyed with a metal complexed dye or a sulfur dye,
the napped artificial leather has a napped surface on which the polyester fibers on at least one side thereof are napped, and the napped surface has a lightness L* value based on the L*a*b* color system, of ≤20, and
the napped artificial leather has a peel strength of 3 kg/cm or more, and a grade of color difference, determined using a Grey scale for assessing staining in an evaluation of color migration to a multifiber adjacent fabric (co-woven fabric No. 1) during pressurization under heating in a wet state under a load of 4 kPa at 200° C. for 60 seconds, of 4 or more.

2. The napped artificial leather according to claim 1 ,
wherein a content ratio of the second elastic polymer is from 0.1 to 3 mass % in the napped artificial leather.

3. The napped artificial leather according to claim 1 ,
wherein the napped artificial leather is not dyed.

4. The napped artificial leather according to claim 1 ,
wherein the napped artificial leather is dyed with the metal complexed dye or the sulfur dye.

5. The napped artificial leather according to claim 1 ,
wherein the elastic polymer is free of a dark color pigment.

6. The napped artificial leather according to claim 1 ,
wherein the polyester fibers are isophthalic acid-modified polyester fibers.

7. The napped artificial leather according to claim 1 ,
wherein the napped artificial leather has a grade of color difference, determined using a Grey scale for assessing staining in an evaluation of color migration to a multifiber adjacent fabric (co-woven fabric No. 1) during pressurization under heating in a dry state under a load of 4 kPa at 200° C. for 60 seconds, of 4 or more.

8. The napped artificial leather according to claim 1 ,
wherein the napped artificial leather has a grade of color difference, determined using a Grey scale for assessing change in color in a test of lightfastness to ultraviolet carbon arc lamp light in accordance with JIS L 0842, of 4 or more.

9. The napped artificial leather according to claim 1 ,
wherein the napped artificial leather has a property of showing a color difference of a vinyl chloride film before and after color migration, determined in an evaluation of color migration to the vinyl chloride film under a load of 750 g/cm 2 at 50° C. for 16 hours, of ΔE*≤2.0.

10. The napped artificial leather according to claim 5 ,
wherein the dark color pigment comprises carbon black.

11. The napped artificial leather according to claim 1 ,
wherein the napped surface has the lightness L* value based on the L*a*b* color system, of ≤18.

Assignees

• Kuraray Co

Inventors

• Nakayama Kimio
• Hishida Hiroyuki

Classifications

• D06N2209/0823

  within the layer by addition of a colorant, e.g. pigments, dyes · CPC title

• D06N2211/28

  Artificial leather · CPC title

• D06N2209/1635

  Elasticity · CPC title

• D06N2203/068

  Polyurethanes · CPC title

• D06N3/14 Primary

  with polyurethanes · CPC title