Process for dyeing leather with dye mixtures
US5354341A · kind A · utility
6Cited by
10References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Mar 26, 2013 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P3/3226
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Leather is dyed using dye mixtures comprising at least two metal-free dyes each carrying a single sulfo or carboxyl group and having a molecular weight in the range from 450 to 700. It is preferred to use a trichromatic dyeing formulation comprising at least one yellow dye of formula (1), at least one red dye of formula (2) and at least one blue dye of formula (3) according to claim 2. Leather is dyed in brilliant shades with these dye mixtures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.