Patent ID: 7597719

Claim:
A hair colouring or bleaching composition comprising at least one oxidizing agent and at least one cross-linked amphoteric polymer, wherein said polymer comprises 1) at least one first monomer of formula (I) R 1 —CH═CR 2 —CO—Y 1 (I) where R 1 is independently selected from the group consisting of a hydrogen atom, a methyl radical and a COOH group, R 2 is independently selected from the group consisting of a hydrogen atom, a methyl radical and a CH 2 COOH group, and Y 1 is independently selected from an OH group or a NHC(CH 3 ) 2 CH 2 SO 3 H group, 2) at least one second monomer selected from diallyldimethylammonium salt, 3-methyl-1-vinylimidazolium salt, or the monomers of formula (II) R 3 —CH═CR 4 —CO—Y 2 —(C n H 2n )—N + (R 5 R 6 R 7 )A − (II) wherein R 3 and R 4 , which are identical or different, are each selected from a hydrogen atom or a methyl radical; R 5 , R 6 and R 7 , which are identical or different, are each selected from a linear or branched alkyl radical having from 1 to 6 carbon atoms; Y 2 is selected from an NH group or an oxygen atom; n is an integer from 2 to 5; and A − is an anion selected from anions derived from organic or inorganic acids and 3) at least one cross-linking agent, wherein said polymer comprises from about 40 mol/% to about 80 mol/% of said first monomer, from about 20 mol/% to about 60 mol/% of said second monomer, and from about 0.01 mol/% to about 5 mol/% of said cross linking agent.