# US 5,350,422 A · Process for improving the fixation of dyes on materials containing amide groups

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- Number: US 5,350,422 A
- Document ID: US5350422A
- Status: Granted
- Kind: A
- Application number: 08/013,318
- Filed: 1993-02-04
- Granted: 1994-09-27
- Earliest claimed: 1992-02-05
- Assignees: Imperial Chemical Industries PLC
- Inventors: Steven M. Burkinshaw; Roy Gordon; David J. Marfell; Kakoma D. Maseka
- Web page: https://patentgrep.com/patent/US5350422A

## CPC

- D06P 5/06: containing nitrogen
- D06P 3/241: {using acid dyes}
- D06P 5/08: macromolecular
- Y10S 8/924: Polyamide fiber
- D06P: DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A process which comprises submitting a polyamide textile material, which has been dyed with an acid dye and subsequently treated with an acidic syntan, to treatment with a cationic agent having a plurality of cationic centers.

## Claims

### Claim 1

A process which comprises submitting a polyamide microfibre textile material, which has been dyed with an acid dye and subsequently treated with an acidic syntan, to treatment at a pH of from 1.5 to 5 with a cationic agent having a plurality of groups selected from the class consisting of amino groups and quaternary ammonium groups, wherein the cationic agent is a polymer of a cationic monomer or copolymer of a cationic monomer and another comonomer.

### Claim 2 (depends on 1)

A process according to claim 1 wherein the polyamide textile material contains micro-fibre yarn.

### Claim 3 (depends on 1)

A process according to claim 1, wherein the treatment with the cationic agent carried out at a temperature of 20.degree. C. to 60.degree. C. for 15 minutes to one hour.

### Claim 4 (depends on 1)

A process according to claim 1, wherein the polyamide textile material is treated with 0.1 to 8% of the cationic agent based on the weight of dyed, syntanned polyamide textile material.

### Claim 5 (depends on 1)

A process according to claim 1, wherein the cationic agent is a copolymer of formaldehyde and dicyandiamide, a poly(dimethyldialkylammonium halide), a copolymer of N,N-dimethylbenzylamine, 2,2'dichloro-diethylether and at least one of dimethylamine and N-methylbenzylamine, a polymeric biguanide, or a poly(hydroxyalkylammonium halide).

### Claim 6 (depends on 5)

A process according to claim 5 wherein the cationic agent is poly(2-hydroxypropylammonium chloride).