| abstract |
Dyeing shaped articles made of polyacrylonitrile, copolymers or blends thereof, with cationic dyestuffs characterised in that the dyeing is carried out in the presence of a quaternary ammonium compound of the formula: ##EQU1## wherein R 1 , R 2 and R 3 represent alkyl or alkenyl groups and R 4 represents an alkyl group or hydrogen, at least one of said groups R 1 , R 2 , R 3 and R 4 having at least eight and not more than eighteen carbon atoms and the remainder from 1 to 4 carbon atoms, X represents an anion, Y represents hydrogen or methyl and n is zero or an average of from 1-30. |