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US 4,225,523 AGranted
Anthraquinone dyestuffs
AssigneeImperial Chemical Industries PLC
InventorDennis Eckersley
Life of this patent
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Abstract
Anthraquinone dyestuffs which in the free acid form are of the formula: ##STR1## where Z is H or SO.sub.3 H, R is H, C.sub.1-4 alkyl or hydroxy C.sub.1-4 alkyl, the ring A may optionally be additionally substituted by OCH.sub.3 and/or SO.sub.3 H. These dyes are especially valuable for application to cellulose and fixation by heating with a carbodiimide such as dicyandiamide.
Claims9
An anthraquinone dyestuff which in the free acid form is of the formula:
- ##STR11## where Z is H or SO.sub.3 H,
- R is H, C.sub.1-4 alkyl or hydroxy C.sub.1-4 alkyl,
- the ring A may optionally be additionally substituted by OCH.sub.3 and/or SO.sub.3 H.
Dependencies are inferred from the claim text.