Bleaching composition for keratinous fibers comprising an associate polyurethane

A ready-to-use composition for bleaching keratin fibers, comprising a mixture of at least one aqueous composition and at least one anhydrous composition comprising at least one oxidizing agent, wherein at least one of the anhydrous and aqueous compositions comprises at least one cationic associative polyurethane of formula (Ia):

• R—X—(P)n[L-(Y)m]r-L′-(P′)p—X′—R′ (Ia)
• wherein:
• R and R′, which may be identical or different, are chosen from hydrophobic groups and hydrogen;
• X and X′, which may be identical or different, are chosen from groups L″ and groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• L, L′, and L″, which may be identical or different, are chosen from groups derived from diisocyanates;
• P and P′, which may be identical or different, are chosen from groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• Y is chosen from hydrophilic groups;
• r is an integer ranging from 1 to 100;
• and
• n, m, and p, which may be identical or different, range from 0 to 1000;
• provided that the at least one cationic associative polyurethane comprises at least one amine functional group chosen from protonated and quaternized amine functional groups, and at least one hydrophobic group.

A process for bleaching keratin fibers, comprising applying to the keratin fibers a ready-to-use composition comprising, in a medium suitable for bleaching, at least one oxidizing agent and at least one cationic associative polyurethane, leaving the composition to act for an action time ranging from 1 to 60 minutes, rinsing the keratin fibers, optionally washing the keratin fibers with shampoo, and then rinsing the keratin fibers again and drying the keratin fibers,

• wherein the at least one cat ionic associative polyurethane is chosen from polyurethanes of formula (Ia):
• R—X—(P)n-[L-(Y)m]r-L′-(P′)p—X′—R′ (Ia)
• wherein:
• R and R′, which may be identical or different, are chosen from hydrophobic groups and hydrogen;
• X and X′, which may be identical or different, are chosen from groups L″ and groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• L, L′, and L″, which may be identical or different, are chosen from groups derived from diisocyanates;
• P and P′, which may be identical or different, are chosen from groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• Y is chosen from hydrophilic groups;
• r is an integer ranging from 1 to 100;
• and
• n, m, and p, which may be identical or different, range from 0 to 1000;
• provided that the at least one cationic associative polyurethane comprises at least one amine functional group chosen from protonated and quaternized amine functional groups, and at least one hydrophobic group.

A multi-compartment device or kit for bleaching human keratin fibers, comprising a first compartment comprising at least one composition chosen from powder compositions and aqueous compositions, and a second compartment comprising an aqueous composition,

• wherein at least one of the two compartments comprises at least one oxidizing agent and at least one of the two compartments comprises at least one cationic associative polyurethane;
• and
• wherein the at least one cationic associative polyurethane is chosen from polyurethanes of formula (Ia):
• R—X—(P)n-[L-(Y)m]r-L′-(P′)p—X′—R′ (Ia)
• wherein:
• R and R′, which may be identical or different, are chosen from hydrophobic groups and hydrogen;
• X and X′, which may be identical or different, are chosen from groups L″ and groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• L, L′, and L″, which may be identical or different, are chosen from groups derived from diisocyanates;
• P and P′, which may be identical or different, are chosen from groups comprising at least one amine functional group optionally bearing at least one hydrophobic group;
• Y is chosen from hydrophilic groups;
• r is an integer ranging from 1 to 100;
• and
• n, m, and p, which may be identical or different, range from 0 to 1000;
• provided that the at least one cationic associative polyurethane comprises at least one amine functional group chosen from protonated and quaternized amine functional groups, and at least one hydrophobic group.