| abstract |
Couplers having the general formula (I): <IMAGE> or the acid salts thereof in which formula R is either (a) hydrogen or (b) a C1-C3 alkyl or (c) a C1-C3 hydroxyalkyl, and Z is either (a) hydroxyalkyl, or (b) alkoxyalkyl in which the alkoxy group contains 1 to 2 carbon atoms, or (c) mesylaminopropyl, or (d) acetylaminoalkyl, or (e) ureidoalkyl, or (f) carbethoxyaminoalkyl the alkyl groups in the radicals constituting z comprising 2 or 3 carbon atoms and Z is not hydroxyethyl when R is hydrogen. These couplers form dyeing compositions when mixed with an oxidation base consisting of a paraphenylenediamine having the general formula: <IMAGE> |