Composition for the oxidation dyeing of keratinous fibres, and dyeing process using this composition

摘要

Compsn. comprises (A) an oxidn. base chosen from p-phenylenediamine derivs. of formula (I) or (II) and addn. salts of these with an acid; (B) 4-hydroxyindole as coupler; and (C) at least one oxidising agent. The compsn. has pH of greater than or equal to 7. In the formulae, R1 is 1-4C alkyl or 2-4C monohydroxyalkoxy; R2 is H or 1-4C alkyl; provided that (i) if R2 is 1-4C alkyl then R1 = R2 (ii) if R1 is in the meta position w.r.t. R2 then R1 and R2 may not both be Et, (iii) if R1 is in ortho position w.r.t. R2 then R1 and R2 may not both be Me and (iv) if R2 is H then R1 may not be Me; R3 is H, 1-4C monohydroxyalkyl or 2-4C polyhydroxyalkyl and R4 is 1-4C monohydroxyalkyl, 2-4C polyhydroxyalkyl or 1-4C alkoxyalkyl; provided that if R4 is 1-4C alkoxyalkyl then R3 is H.