Napped artificial leather, polyester fiber, and non-woven fabric

Patent metadata

Field	Value
Publication number	US-11339530-B2
Application number	US-201716346742-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Dec 13, 2016
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

Disclosed is a napped artificial leather including: an artificial leather base material that includes a non-woven fabric of polyester fibers having a Young's modulus of 1 to 6 GPa, an average fiber-toughness of 8 to 40 cN·%, and a crystallinity of 35% or less, and an elastic polymer, the artificial leather base material having, on at least one surface thereof, a napped surface on which the polyester fibers are napped. Also disclosed are polyester fibers having a Young's modulus of 1 to 6 GPa, an average fiber-toughness of 8 to 40 cN·%, and a crystallinity of 35% or less, and a non-woven fabric including the polyester fibers.

First claim

The invention claimed is:

1. A napped artificial leather, comprising:
an artificial leather base material that comprises a non-woven fabric comprising polyester fibers having a Young's modulus of 1.4 to 6 GPa, and average fiber-toughness of 8 to 40 cN %, and a crystallinity of 35% or less, and an elastic polymer contained in the voids of the non-woven fabric,
wherein the polyester fibers comprise a polymer alloy resin of two or more polyesters having copolymer compositions different from each other, wherein the polymer alloy resin comprises a modified polyester comprising an isophthalic acid unit and a terephthalic acid unit as acid-based monomer units, and a butane diol unit and a hexane diol unit as diol-based monomer units, and
the artificial base material has, on at least one surface thereof, a napped surface on which the polyester fibers are napped.

2. The napped artificial leather of claim 1 ,
wherein the polyester fibers have a compressive force, as determined when 69120 fibers of the polyester fibers are compressively deformed by 1.0 mm in a compressive force measurement using a digital force gage, of 15 N or less.

3. The napped artificial leather of claim 1 ,
wherein the napped surface has an arithmetic mean height, as determined in a surface roughness measurement in accordance with ISO 25178, of 30 μm or less in a grain direction.

4. Polyester fibers having a Young's modulus of 1.4 to 6 GPa, an average fiber-toughness of 8 to 40 cN %, and a crystallinity of 35% or less,
wherein the polyester fibers comprise a polymer alloy resin of two or more polyester having copolymer compositions different from each other, wherein the polymer alloy resin comprises a modified polyester comprising an isophthalic acid unit and a terephthalic acid unit as acid-based monomer units, and a butane diol unit and a hexane diol unit as diol-based monomer units.

5. The polyester fibers of claim 4 ,
wherein the polyester fibers have a compressive force, as determined when 69120 fibers of the polyester fibers are compressively deformed by 1.0 mm in a compressive force measurement using a digital force gage, of 15 N or less.

6. A non-woven fabric, comprising the polyester fibers of claim 4 .

Assignees

• Kuraray Co

Inventors

• Meguro Masashi
• Nakatsuka Hitoshi

Classifications

• D06N3/0075 Primary

  Napping, teasing, raising or abrading of the resin coating (raising, napping of the web before coating D06N3/004) · CPC title

• D01F8/14

  with at least one polyester as constituent · CPC title

• D06N3/0011

  using non-woven fabrics · CPC title

• D06N3/14

  with polyurethanes · CPC title

• D04H1/488

  in combination with bonding agents · CPC title