Liquid form of dyestuffs
AssigneeCiba-Geigy Corporation
InventorsBrian L. Yates, Malcolm C. Clark
Life of this patent
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Abstract
A liquid dyestuff composition, especially suitable for dyeing paper, comprises: (a) 5-40% by weight of a dyestuff having the formula: ##STR1## wherein X is hydrogen or an alkali metal cation, n represents an integer from 1 to 2, Q and Q.sub.1 together form a fused benzene or naphthalene residue, and Y is a residue having the formula ##STR2## whereby ring A, the fused residue formed by Q and Q.sub.1, or the residue Y can each be further substituted by one or more alkyl, alkoxy, hydroxy, carboxy or dehydrothio-p-toluidine groups or halogen atoms; (b) 1-10% by weight of an alkali metal hydroxide; (c) 45-75% by weight of a polyhydric alcohol or a water-soluble ether thereof; and (d) 0-40% by weight of water.
Claims10
A liquid dyestuff composition comprising
- (a) 5-40% by weight of a dyestuff having the formula ##STR10## wherein X is hydrogen or an alkali metal cation, n represents 1 or 2, R.sub.1 is a hydrogen atom and R is methyl or a dehydrothio-p-toluidine residue;
- or R and R.sub.1 together are the atoms required to form a fused benzene ring, and Y is a residue having the formula ##STR11## whereby ring A, the fused residue formed by R and R.sub.1, or the residue Y can each be further substituted by one or more alkyl, alkoxy, hydroxy, carboxy or dehydrothio-p-toluidine groups or halogen atoms;
- (b) 1-10% by weight of an alkali metal hydroxide;
- (c) 45-75% by weight of a polyhydric alcohol or a water-soluble ether thereof;
- and
- (d) 0-40% by weight of water.
The composition of claim 1 wherein the dyestuff has the formula ##STR12## wherein ring A and X are as defined in claim 11.
The composition of claim 1 wherein the dyestuff has the formula ##STR13## wherein ring A and X are as defined in claim 11, and R.sub.1 is a hydrogen atom and R is methyl or a dehydrothio-p-toluidine residue.
Dependencies are inferred from the claim text.