Patent ID: 7147672

Claim:
A composition for the oxidation dyeing of keratin fibers, comprising, in an appropriate dyeing medium: at least one oxidation dye, at least one fatty acid chosen from C 10 –C 14 fatty acids, and at least one cationic poly(vinyllactam) polymer comprising: at least one monomer (a) chosen from vinyllactam and alkylvinyllactam monomers and at least one monomer (b) chosen from monomers having the following structures (Ia) and (Ib): wherein: X is chosen from an oxygen atom and radicals NR 6 , R 1 and R 6 , which may be identical or different, are each chosen from a hydrogen atom and linear and branched C 1 –C 5 alkyl radicals, R 2 is chosen from linear and branched C 1 –C 4 alkyl radicals, R 3 , R 4 and R 5 , which may be identical or different, are each chosen from a hydrogen atom, linear and branched C 1 –C 30 alkyl radicals and radicals of formula (II): wherein Y, Y 1 and Y 2 , which may be identical or different, are each chosen from linear and branched C 2 –C 16 alkylene radicals, R 7 is chosen from a hydrogen atom, linear and branched C 1 –C 4 alkyl radicals and linear and branched C 1 –C 4 hydroxyalkyl radicals, R 8 is chosen from a hydrogen atom and linear and branched C 1 –C 30 alkyl radicals, p, q and r, which may be identical or different, are each integers equal to either the value zero, or the value 1, m and n, which may be identical or different, are each integers ranging from 0 to 100, x is an integer ranging from 1 to 100, and Z − is chosen from organic and inorganic acid anions, provided that: at least one of the substituents R 3 , R 4 , R 5 or R 8 , is chosen from linear and branched C 9 –C 30 alkyl radicals, if m or n is different from zero, then q is equal to 1, and if m or n are equal to zero, then p or q is equal to 0.