Agent comprising hydrogen peroxide having improved viscosity adjustment

1. An agent, comprising in a cosmetically suitable carrier at least hydrogen peroxide, at least one homo- or copolymer of acrylic acid and/or methacrylic acid and at least one polyurethane, characterized in that the polyurethane is a polycondensation product of polyethylene glycol(s), diisocyanate(s) and optionally ethoxylated fatty alcohol(s).

2. The agent according to claim 1 , wherein the polyurethane is a polycondensation product of polyethylene glycol with 50 to 250 ethylene glycol units (PEG-50 to PEG-250), a diisocyanate and ethoxylated C 12 -C 20 fatty alcohols with a degree of ethoxylation of 6 to 25.

3. The agent according to claim 1 , wherein the polyurethane is a polycondensation product of PEG-140, hexamethylene diisocyanate and a mixture of C 12 -C 14 Pareth-10, C 16 -C 18 Pareth-11 and C 18 -C 20 Pareth-11.

4. The agent according to claim 1 , wherein the agent comprises at least one copolymer of ethyl acrylate and methacrylic acid and/or acrylic acid as the homo- and/or copolymer of acrylic acid and/or methacrylic acid.

5. The agent according to claim 1 , wherein the polyurethane is present in a proportion by weight of 0.01 to 5 wt. % relative to the total weight of the agent.

6. The agent according to claim 1 , wherein the homo- and/or copolymer(s) of acrylic acid and/or methacrylic acid is/are present in a proportion by weight of 0.001 to 2.0 wt. % relative to the total weight of the agent.

7. A preparation for modifying the color of keratinic fibers, in particular human hair, characterized in that the preparation is produced immediately prior to use by mixing at least one agent according claim 1 and at least one alkalizing preparation comprising in a cosmetically suitable carrier at least one alkalizing agent and additionally

(i) at least one fatty alcohol and/or

(ii) at least one anionic, amphoteric and/or zwitterionic surfactant and/or

(iii) at least one amino acid and/or

(iv) at least one ethoxylated fatty alcohol and/or

(v) at least one cationic and/or amphoteric polymer.

8. The preparation according to claim 7 , wherein the alkalizing preparation additionally includes at least one oxidation dye precursor.

9. A method for modifying the color of keratinic fibers, in particular human hair, comprising:

i) producing a preparation for modifying the color of keratinic fibers immediately prior to use by mixing at least one agent according to claim 1 and at least one alkalizing preparation, comprising in a cosmetically suitable carrier at least one alkalizing agent and additionally

(i) at least one fatty alcohol and/or

(ii) at least one anionic, amphoteric and/or zwitterionic surfactant and/or

(iii) at least one amino acid and/or

(iv) at least one ethoxylated fatty alcohol and/or

(v) at least one cationic and/or amphoteric polymer;

ii) applying the ready-to-use preparation from method step i) onto the keratin fibers to be treated and leaving the preparation on the fibers for a period of exposure of 5 to 60 minutes; and

iii) rinsing the fibers.

10. A multicomponent packaging unit (kit of parts) for modifying the color of keratinic fibers, in particular human hair, comprising at least two components packaged separately from one another, characterized in that

the first component is an agent according to claim 1 and further characterized in that

the second component is an alkalizing preparation comprising in a cosmetically suitable carrier at least one alkalizing agent and additionally

(i) at least one fatty alcohol and/or

(ii) at least one anionic, amphoteric and/or zwitterionic surfactant and/or

(iii) at least one amino acid and/or

(iv) at least one ethoxylated fatty alcohol and/or

(v) at least one cationic and/or amphoteric polymer.