Method for dyeing fibrous materials and dye assistant relating to the same
US5437690A · kind A · utility
5Cited by
43References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | May 25, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S8/925
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for dyeing fibrous material is provided. The method includes contacting a fibrous material with a dyebath comprising a mixture of a dye assistant and a dye soluble or dispersed with the dye assistant in the dyebath. The dye assistant comprises a N-alkyl substituted aromatic sulfonamide. The dye assistant of the present invention can be advantageously utilized for dyeing difficult to dye fibers such as aromatic polyamide fibers, polybenzimidazole fibers and aromatic polyimide fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.