Azoic dyeing of leather
US3933423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1973 |
| Grant date | Jan 20, 1976 |
| Priority date | — |
| Expiry date | May 15, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24438
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Dry leather is dyed with azoic dyes without wetting the leather with water by incorporating into the leather the required diazonium component and any required coupling component in a substantially non-aqueous volatile low-viscosity solvent and incorporating into the leather any other materials required for the coupling reaction in such a solvent or as a vapor. The coupling component can be a natural or synthetic phenolic tanning agent employed in tanning the leather. Dye patterns can be applied to the surface of the leather by using a light-sensitive diazonium component and photo-imaging the surface before effecting coupling. Dry leather is dyed by such processes without significant change in properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.