Method for the production of a dye preparation based on madder root
US6596036B2 · kind B2 · utility
0Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Sep 25, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B61/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method for the production of a dye preparation from madder root, comprising extraction of madder root in water at a temperature below 70-75° C., preferably below 65° C., while providing oxygen to the reaction mixture of madder root in water to obtain the dye preparation and to the dye preparation thus obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.