Patent ID: 7559957

Claim:
A composition for the oxidation dyeing of keratin fibers, comprising, in a medium that is suitable for dyeing, at least one oxidation dye and at least one amphoteric polymer comprising a repetition of: (i) from 45 mol % to 60 mol % of at least one unit derived from a monomer of acrylamide type, (ii) at least one unit derived from a monomer of dialkyldiallylammonium halide type, and (iii) at least one unit derived from a monomer of vinylcarboxylic acid type, wherein the mole ratio of the amount of the at least one unit derived from a monomer of dialkyldiallylammonium halide type to the amount of the at least one unit derived from a monomer of vinylcarboxylic acid type is greater than or equal to 1.