# US 5,344,708 A · Bulked random copolyamide yarns of nylon 6 and nylon 6,6 having enhanced dyeability

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- Number: US 5,344,708 A
- Document ID: US5344708A
- Status: Granted
- Kind: A
- Application number: 08/156,610
- Filed: 1993-11-23
- Granted: 1994-09-06
- Earliest claimed: 1992-05-12
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: William T. Windley
- Web page: https://patentgrep.com/patent/US5344708A

## CPC

- D02G 3/445: {Yarns or threads for use in floor fabrics (floor fabrics A47G27/00; floor coverings on textile basis D06N7/0005)}
- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence)
- D01F 6/80: from copolyamides
- D02G 3/24: Bulked yarns or threads, e.g. formed from staple fibre components with different relaxation characteristics
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 428/2969: Polyamide, polyimide or polyester
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Bulked random copolyamide yarns having enhanced dyeability as compared to comparable nylon 6 fibers are disclosed. The random copolyamides contain from 80 to 96% by weight of nylon 6 units and 4 to 20% by weight of nylon 6,6 units with from 90 to 94% nylon 6 and 6 to 10% nylon 6,6 being the preferred range. Further increases in dyeability are obtained by steam heat-setting the yarns.

## Claims

### Claim 1

A bulked random copolyamide yarn comprising 4 to 20 weight percent repeating units of the structure ##STR3## and 80 to 96 weight percent repeating units of the structure ##STR4## said yarn before heat-setting having a cold dye rate of at least 1000.times.10.sup.-5 sec.sup.-1.

### Claim 2 (depends on 1)

The yarn of claim 1 wherein the random copolyamide contains 6 to 10 weight percent repeating units of the structure ##STR5## and 90 to 94 weight percent repeating units of the structure ##STR6##