Imperial Chemical Industries Limited

Dennis Eckersley

David F Newton

Colin William Greenhalgh

Duncan Adrian Phillips

Gerald Williams

Kenneth Dunkerley

Ian Cheetham

Vibhas Chokshi

Anthraquinone dyestuffs which in the free acid form are of the formula: ##STR1## where Z is H or SO.sub.3 H,

Anthraquinone dyestuffs

Dyeing nylon by applying sulphonated or unsulphonated dyestuffs containing cyclic anhydride groups, anhydride forming dicarboxylic acid groups or half-esters or half-amides thereof, as free acids or as salts with ammonia or volatile amines, and heating the fibre until dyestuff fixation takes place.

Dyeing process

Dyeing cellulose or cellulose/polyester blends by applying unsulphonated dyestuffs containing cyclic anhydride groups, anhydride-forming dicarboxylic acid groups or half-esters or half-amides thereof, as free acids or as salts with ammonia or volatile amines, and heating the fibre until dyestuff fixation takes place.

Growing community of inventors

Manchester, United Kingdom

Dennis Eckersley