Imperial Chemical Industries Limited

John Alexander Bone

Denis Robert Ridyard

Kevin L Birkett

Water-soluble azo dye which, in the form of the free acid, has the formula ##STR1## WHEREIN A represents lower alkyl, hydroxy lower alkyl or phenyl and R represents hydrogen, lower alkyl or hydroxy lower alkyl and A, when phenyl, and ring B is unsubstituted or substituted by nitro, alkyl or alkoxy, m has a value of 0 or 1 and E represents a residue selected from: ##STR2## wherein R.sup.5 represents hydrogen, lower alkyl, hydroxy lower alkyl or benzyl, R.sup.6 represents lower alkyl or hydroxy lower alkyl and R.sup.7 and R.sup.8 each independently represent hydrogen, lower alkyl, lower alkoxy or acetylamino; and ##STR3## WHEREIN R.sup.9 represents lower alkyl, hydroxy lower alkyl, sulphato lower alkyl, phenyl or phenyl substituted by lower alkyl, lower alkoxy or hydroxy and p has a value of 0 or 1 with the proviso that there are no more than two sulpho groups in said dye. The dye is useful to color natural and synthetic polyamide textile materials.

Growing community of inventors

Manchester, United Kingdom

John Alexander Bone