Patent · US Expired

Sulphur dyestuffs which are ready for dyeing, and processes for dyeing and printing with sulphur dyestuffs

US4252533A · kind A · utility

4Cited by

5References

10Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Christian Heid · San Mateo, US
Konrad Mix · Frankfurt, DE
Heinz Dickmanns · Frankfurt am Main, DE
Erwin Krusche

Key dates

Filing date	Feb 22, 1980
Grant date	Feb 24, 1981
Priority date	—
Expiry date	Feb 22, 2000

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD06P1/30
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Dyeing and printing with sulfur dyestuffs involves dissolving the dyestuff by reduction. The dissolved reduced dyestuff is applied to the material to be dyed or printed and the dyestuff is reconverted into in soluble dyestuff by oxidation. The present invention improves the prior art by using as the dyestuff reducing agent a compound of the formula ##STR1## or an alkali metal salt thereof, wherein R is --H or --OH and R' is --H, --CH.sub.3 or --CH.sub.2 OH.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.