Aqueous preparations comprising at least one water-soluble or water-dispersible copolymer with cationgenic groups

1. An aqueous hair preparation comprising:

A) 2 to 20% by weight of at least one water-soluble or water-dispersible copolymer A) with cationogenic groups, which consists essentially of:

a) 3 to 15% by weight of N-vinylimidazole,

b1) 30 to 70% by weight of N-vinylpyrrolidone,

b2) 20 to 35% by weight of methacrylamide, and

b3) at least one monomer b3) which is a quaternization product of N-vinylimidazole, whereby the amount of monomer b3) is at most 10% by weight, in copolymerized form;

with the proviso that the sum of the amounts of components a) to b3) is 100% by weight; and

B) at least one cosmetically acceptable carrier,

wherein the pH of the aqueous preparation has a value in the range from pH 4 to pH 6.

2. The aqueous hair preparation according to claim 1 , wherein the component B) is selected from the group consisting of:

i water;

ii water-miscible organic solvents;

iii oils, fats, and waxes;

iv esters of C 6 -C 30 -monocarboxylic acids with mono-, di- or trihydric alcohols which are different from iii);

v saturated acyclic and cyclic hydrocarbons;

vi fatty acids;

vii fatty alcohols;

viii propellant gases;

and mixtures thereof.

3. The aqueous hair preparation according to claim 1 , further comprising at least one additive different from components A) and B), wherein the additive is selected from the group consisting of cosmetically active ingredients, emulsifiers, surfactants, preservatives, perfume oils, thickeners, hair polymers, hair and skin conditioners, graft polymers, water-soluble or dispersible silicone-containing polymers, light protection agents, bleaches, gel formers, care agents, colorants, tinting agents, tanning agents, dyes, pigments, consistency-imparting agents, humectants, refatting agents, collagen, protein hydrolyzates, lipids, antioxidants, antifoams, antistats, emollients and softeners.

4. The aqueous hair preparation according to claim 1 , further comprising at least one additional water-soluble polymer.

5. The aqueous hair preparation according to claim 4 , wherein the additional water-soluble polymer is chitosan and/or a chitosan derivative.

6. The aqueous hair preparation according to claim 1 , further comprising at least one non-ionic thickener.

7. The aqueous hair preparation according to claim 1 , wherein the pH has a value in the range from pH 5 to pH 6.

8. The aqueous hair preparation according to claim 1 , wherein the pH is adjusted by adding hydroxycarboxylic acid.

9. The aqueous hair preparation according to claim 1 , wherein the pH is adjusted by adding inorganic acid.

10. A method of preparing an aqueous hair preparation according to claim 1 , comprising:

adding the at least one water-soluble or water-dispersible copolymer A) to at least one cosmetically acceptable carrier B),

wherein the pH adjustment takes place after the preparation of copolymer A) is complete.

11. A cosmetic composition comprising the aqueous hair preparation of claim 1 , wherein the cosmetic composition is a skin-cleansing composition, a composition for the care and protection of skin, a nailcare composition, a preparation for decorative cosmetics or a hair-treatment composition.

12. A setting agent or conditioner comprising the aqueous hair preparation according to claim 1 .

13. The composition according to claim 11 , in the form of a hair gel, shampoo, setting foam, hair tonic, hairspray or hair foam.

14. The aqueous hair preparation according to claim 1 , wherein the pH has a value of from 4.5 to 6.

15. A foam comprising the aqueous hair preparation according to claim 1 .

16. A mousse comprising the aqueous hair preparation according to claim 1 .