Carbon-containing fiber blends including aramid and modacrylic fiber

Patent metadata

Field	Value
Publication number	US-10253435-B2
Application number	US-201715669058-A
Country	US
Kind code	B2
Filing date	Aug 4, 2017
Priority date	Sep 1, 2016
Publication date	Apr 9, 2019
Grant date	Apr 9, 2019

Abstract

An intimate blend of staple fibers, and a yarn, fabric, and article of clothing providing surprising arc performance; the intimate blend comprises 15 to 70 weight percent modacrylic fiber, 5 to 27 weight percent para-aramid fiber; and 3 to 80 weight percent meta-aramid fiber, wherein 25 to 100 parts of the meta-aramid fiber contains 0.5 to 20 weight percent discrete homogeneously dispersed carbon particles and 0 to 75 parts of the meta-aramid fiber free of discrete carbon particles, the intimate blend having a total content of 0.1 to 3 weight percent discrete carbon particles.

First claim

What is claimed is:

1. An intimate blend of staple fibers, comprising:
(a) 15 to 70 weight percent modacrylic fiber;
(b) 5 to 27 weight percent para-aramid fiber; and
(c) 3 to 80 weight percent meta-aramid fiber;
wherein,
i) 25 to 100 parts of the meta-aramid fiber present in the blend contains 0.5 to 20 weight percent carbon particles having an average particle size of 10 micrometers or less, based on the amount of carbon particles in an individual fiber, the carbon particles being homogeneously dispersed in that fiber; and
ii) 0 to 75 parts of the meta-aramid fiber present in the blend are free of carbon particles;

the intimate blend having a total content of 0.1 to 3 weight percent carbon particles.

2. The intimate blend of staple fibers of claim 1 , comprising:
(a) 40 to 70 weight percent modacrylic fiber;
(b) 5 to 20 weight percent para-aramid fiber; and
(c) 10 to 40 weight percent meta-aramid fiber;
wherein,
i) 25 to 100 parts of the meta-aramid fiber present in the blend contains 0.5 to 20 weight percent carbon particles having an average particle size of 10 micrometers or less, based on the amount of carbon particles in an individual fiber, the carbon particles being homogeneously dispersed in that fiber; and
ii) 0 to 75 parts of the meta-aramid fiber present in the blend are free of carbon particles;

the intimate blend having a total content of 0.1 to 3 weight percent carbon particles.

3. The intimate blend of staple fibers of claim 1 wherein the meta-aramid fiber in i) is present in an amount of 25 to 50 parts, and the meta-aramid fiber in ii) is present in an amount of 50 to 75 parts.

4. The intimate blend of staple fibers of claim 1 having a total content of 0.5 to 3 weight percent carbon particles.

5. The intimate blend of staple fibers of claim 1 wherein the meta-aramid fiber in i) comprises 0.5 to 6 weight percent carbon particles.

6. The intimate blend of staple fibers of claim 1 wherein the meta-aramid is poly(meta-phenylene isophthalamide).

7. A yarn comprising the intimate blend of staple fibers of claim 1 .

8. A fabric comprising the yarn of claim 7 .

9. An article of thermal protective clothing comprising the fabric of claim 8 .

10. A garment comprising the yarn of claim 7 .

Assignees

• Du Pont

Inventors

• Zhu Reiyao

Classifications

• D01F1/09 Primary

  for making electroconductive or anti-static filaments · CPC title

• D10B2331/021

  aromatic polyamides, e.g. aramides · CPC title

• C08L33/20

  Homopolymers or copolymers of acrylonitrile (C08L55/02 takes precedence) · CPC title

• A41D31/26

  Electrically protective, e.g. preventing static electricity or electric shock · CPC title

• D02G3/443

  Heat-resistant, fireproof or flame-retardant yarns or threads (fire- or flame-proof filaments D01F1/07; woven fabrics using heat-resistant or fireproof threads D03D15/513) · CPC title