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US 5,294,231 AGranted
Dyeing process
AssigneeSandoz Ltd.
InventorFrancis Palacin
Life of this patent
Estimating the term…
Abstract
A process for dyeing a mixed fibre substrate with at least one disperse dye and at least one metal complex dye selected from direct dyes and reactive dyes characterized in that dyeing is carried out in the presence of a compound of formula I ##STR1## in which X is --S--, --O--, or --NH--; R.sub.1 is hydrogen, --OH or C.sub.1-4 alkyl; and R.sub.2 is hydrogen, NH.sub.4 or an alkali metal (such as Na or K).
Claims10
A process for dyeing a polyester/cellulose or polyamide/cellulose substrate with at least one disperse dye and at least one metal complex dye selected from direct dyes and reactive dyes, characterized in that,
- dyeing is carried out in the presence of a compound of formula I in the dye bath ##STR3## in which X is --S--, --O--, or --NH--;
- R.sub.1 is hydrogen, --OH, or C.sub.1-4 alkyl;
- and
- R.sub.2 is hydrogen, NH.sub.4, or an alkali metal.
1 more element
Dependencies are inferred from the claim text.