# US 12,215,442 B2 · Flame resistant fabric comprising a PTW fiber blend

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,215,442 B2
- Document ID: US12215442B2
- Status: Granted
- Kind: B2
- Application number: 17/708,592
- Filed: 2022-03-30
- Published: 2023-10-05
- Granted: 2025-02-04
- Earliest claimed: 2022-03-30
- Assignees: Ptw Holdings, LLC
- Applicants: Ptw Holdings, LLC
- Inventors: Paul Amaral; David Ronner
- Web page: https://patentgrep.com/patent/US12215442B2

## CPC

- D02G 3/047: {including aramid fibres}
- D02G 3/441: {Yarns or threads with antistatic, conductive or radiation-shielding properties (electroconductive, anti-static or radiation-shielding filaments D01F1/09, D01F1/106; anti-static fabrics D03D15/533; conducting, insulating or anti-static layers for floor coverings D06N7/0042)}
- D02G 3/443: {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)}
- D03D 1/0035: {Protective fabrics}
- D03D 15/513: heat-resistant or fireproof
- D10B 2201/20: Cellulose-derived artificial fibres
- D10B 2211/02: Wool
- D10B 2331/021: aromatic polyamides, e.g. aramides
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D03D: WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

A yarn is disclosed, which includes a blend of: 33-75 wt. % of a flame resistant fiber having a limit of oxygen index of 43%, a thermal conductivity of 0.0063 watt/meter/K and a moisture regain of 12%; 10-40 wt. % of an aramid fiber; and up to 36% of a wearability enhancing fiber selected from the group consisting of wool, flame resistant rayon and lyocell, wherein the yarn is free of thermoplastics and is sufficiently flame resistant such that a fabric consisting of the yarn is effective to limit a body burn percentage resulting from 4 seconds of flame exposure to less than 35% as measured by ASTM F1930. Fabrics and garments including the inventive yarn are also disclosed.

## Claims

### Claim 1

A yarn comprising a blend of:
50 wt. % of a flame resistant fiber having a limit of oxygen index of 43%, a thermal conductivity of 0.0063 watt/meter/K and a moisture regain of 12%;
30 wt. % of a para-aramid fiber; and
20 wt. % of wool,
wherein the yarn is free of thermoplastics and is sufficiently flame resistant such that a fabric consisting of the yarn is effective to limit a body burn percentage resulting from 4 seconds of flame exposure to less than 13% as measured by ASTM F1930.

### Claim 2 (depends on 1)

The yarn of claim 1, which is free of cellulosic fibers.

### Claim 3 (depends on 1)

The yarn of claim 1, further comprising an electrostatic dissipative fiber.

### Claim 4 (depends on 1)

A garment comprising the yarn of claim 1, which is effective to limit the body burn percentage resulting from 4 seconds of flame exposure to less than 13% as measured by ASTM F1930.

### Claim 5

A fabric comprising a blend of:
50 wt. % of a flame resistant fiber having a limit of oxygen index of 43%, a thermal conductivity of 0.0063 watt/meter/K and a moisture regain of 12%;
30 wt. % of a para-aramid fiber; and
20 wt. % of wool,
wherein the fabric is free of thermoplastics and is effective to limit a body burn percentage resulting from 4 seconds of flame exposure to less than 13% as measured by ASTM F1930.

### Claim 6 (depends on 5)

The fabric of claim 5, which is free of cellulosic fibers.

### Claim 7 (depends on 5)

The fabric of claim 5, further comprising an electrostatic dissipative fiber.

### Claim 8 (depends on 5)

The fabric of claim 5, which has a limit of oxygen index of 35.1.

### Claim 9 (depends on 1)

The yarn of claim 1, which has a limit of oxygen index of 35.1.