Carboxylic acid type water-soluble sulfur dye
US9193696B2 · kind B2 · utility
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3References
6Claims
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Key dates
| Filing date | Nov 30, 2012 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Nov 30, 2032 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P1/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a group of water-soluble sulfur dye having carboxyl groups. For the kind of dye, a sulfur dye is first reduced to a leuco compound by sodium sulfide, and the leuco compound reacts with an active compound containing carboxyl groups to obtain a water-soluble sulfur dye containing the carboxyl group. The water-soluble sulfur dye provided by the present invention is applicable to dying of cotton, wool, silk, and leather. Being both water-soluble and carboxyl group reactive, the product has a simple application process and desirable color fastness, thereby having broad application prospects.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.