Process for dyeing and printing cellulose fibres
AssigneeBayer Aktiengesellschaft
InventorsGunter Gehrke, Werner Kuhnel, Robert Kuth
Life of this patent
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Abstract
For dyeing and printing cellulose fibres which have been swollen with water-miscible swelling agents or mixed fibres containing these fibres, the fibres are treated with dyestuffs which are free from sulphonic acid groups and carboxylic acid groups, of the general formula ##STR1## wherein R represents optionally substituted C.sub.1 -C.sub.6 -alkyl, cyclohexyl, C.sub.1 -C.sub.4 -alkoxy, phenyl, benzyl, phenylethyl, phenylpropyl or phenoxy, or chlorine or bromine, n represents 0, 1 or 2, one X represents OH and the other X represents NO.sub.2, NH.sub.2 or R'-CONH and R' represents optionally substituted C.sub.1 -C.sub.4 -alkyl or phenyl, and the dyestuffs are fixed by heat treatment.
Claims4
In the dyeing and printing of cellulose fibres alone or admixed with other fibers by swelling said fibres with a water-miscible swelling agent capable of maintaining the fibers in swollen condition after removal of water, boiling above 150.degree. C. and, treating the swollen fibres with a dyestuff, and fixing the dyestuff by heat treatment, the improvement which comprises employing as said dyestuff a compound of the formula ##STR10## wherein R is optionally substituted C.sub.1 -C.sub.6 -alkyl, cyclohexyl, C.sub.1 -C.sub.4 -alkoxy, phenyl, benzyl, phenylethyl, phenylpropyl or phenoxy, or chlorine or bromine,
- n is 0, 1 or 2,
- one X is OH and
- the other X is NO.sub.2, NH.sub.2 or R'-COHN, and
- R' is optionally substituted C.sub.1 -C.sub.4 -alkyl or phenyl.
Dependencies are inferred from the claim text.