Cosmetic product comprising at least one water-soluble copolymer which contains (meth)acrylamide units

1. A copolymer A), obtained by free-radical copolymerization of:

a) 20 to 40% by weight of methacrylamide,

b) 40 to 70% by weight of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 25% by weight of vinylimidazole and/or derivatives thereof,

in the presence of from 1 to 20% by weight of polymers d2) which have at least 50% by weight repeat units derived from vinyl alcohol and/or starch and starch derivatives d3),

wherein the copolymer provides a tack-free smooth film.

2. A cosmetic composition, comprising the copolymer of claim 1 and at least one at least one cosmetically acceptable carrier.

3. The cosmetic composition of claim 2 , which is a skin-cleansing composition, a composition for the care and protection of the skin, a nail care composition, a preparation for decorative cosmetics, a hair-treatment composition or a coating composition.

4. A copolymer A), obtained by free-radical copolymerization of:

a) 10 to 45% by weight, based on the total weight of components a) to d), of acrylamide and/or methacrylamide,

b) 60 to 90% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 25% by weight, based on the total weight of components a) to d), of vinylimidazole and/or derivatives thereof, optionally in the presence of up to 25% by weight, based on the total weight of components a) to d), of at least one water-soluble component d), which is selected from the group consisting of:

d1) polyether-containing compounds,

d2) polymers which have at least 50% by weight repeat units derived from vinyl alcohol,

d3) starch and starch derivatives,

and mixtures thereof,

wherein the copolymer provides a tack-free smooth film.

5. The copolymer A) as claimed in claim 4 obtained by free-radical copolymerization of:

a) 10 to 45% by weight, based on the total weight of components a) to d), of methacrylamide,

b) 60 to 90% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 25% by weight, based on the total weight of components a) to d), of vinylimidazole and/or derivatives thereof,

optionally, in the presence of up to 20% by weight, based on the total weight of components a) to d), of polymers d2) and/or starch and starch derivatives d3).

6. A copolymer A), obtained by free-radical copolymerization of:

a) 20 to 40% by weight, based on the total weight of components a) to d), of acrylamide and/or methacrylamide,

b) 40 to 70% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 25% by weight, based on the total weight of components a) to d), of vinylimidazole and derivatives thereof,

optionally in the presence of up to 25% by weight, based on the total weight of components a) to d), of at least one water-soluble component d), which is selected from the group consisting of:

d1) polyether-containing compounds,

d2) polymers which have at least 50% by weight repeat units derived from vinyl alcohol,

d3) starch and starch derivatives,

and mixtures thereof,

wherein the copolymer provides a tack-free smooth film.

7. The copolymer A) as claimed in claim 6 , obtained by free-radical polymerization of:

a) 20 to 40% by weight of methacrylamide,

b) 40 to 70% by weight of vinylpyrrolidone and/or vinylcaprolactam, and

c) 1 to 20% by weight of vinylimidazole and derivatives thereof.

8. A copolymer A), obtained by free-radical copolymerization of:

a) 5 to 50% by weight, based on the total weight of components a) to d), of acrylamide and/or methacrylamide,

b) 40 to 85% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 25% by weight, based on the total weight of components a) to d), of vinylimidazole and derivatives thereof,

optionally in the presence of up to 25% by weight, based on the total weight of components a) to d), of at least one water-soluble component d), which is selected from the group consisting of:

d1) polyether-containing compounds,

d2) polymers which have at least 50% by weight repeat units derived from vinyl alcohol,

d3) starch and starch derivatives,

and mixtures thereof,

wherein the copolymer provides a tack-free smooth film.

9. The copolymer A) as claimed in claim 8 , obtained by free-radical copolymerization of:

a) 5 to 50% by weight, based on the total weight of components a) to d), of methacrylamide,

b) 40 to 85% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.2 to 20% by weight, based on the total weight of components a) to d), of vinylimidazole and/or derivatives thereof,

optionally in the presence of up to 10% by weight, based on the total weight of components a) to d), of polymers d2), which are derived from vinyl alcohol, and optionally in the presence of up to 1% by weight, based on the total weight of components a) to d), of at least one crosslinker.

10. A copolymer A), obtained by free-radical copolymerization of:

a) 30 to 40% by weight, based on the total weight of components a) to d), of methacrylamide,

b) 20 to 60% by weight, based on the total weight of components a) to d), of vinylpyrrolidone and 1 to 20% by weight of vinylcaprolactam, and

c) 0.2 to 25% by weight, based on the total weight of components a) to d), of vinylimidazole and/or derivatives thereof,

optionally in the presence of up to 25% by weight, based on the total weight of components a) to d), of at least one water-soluble component d), which is selected from the group consisting of:

d1) polyether-containing compounds,

d2) polymers which have at least 50% by weight repeat units derived from vinyl alcohol,

d3) starch and starch derivatives,

and mixtures thereof,

wherein the copolymer provides a tack-free smooth film.

11. The copolymer A) as claimed in claim 8 , obtained by free-radical polymerization of:

a) 7 to 45% by weight of methacrylamide,

b) 50 to 80% by weight of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.3 to 10% by weight of vinylimidazole and/or derivatives thereof, in the presence of 0.1 to 10% by weight of polymers d2) which are derived from vinyl alcohol.

12. The copolymer A) as claimed in claim 8 , obtained by free-radical polymerization of:

a) 10 to 45% by weight of methacrylamide,

b) 50 to 80% by weight of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.3 to 10% by weight of vinylimidazole and/or a derivative thereof.

13. The copolymer A) as claimed in claim 8 , obtained by free-radical polymerization of:

a) 10 to 45% by weight of methacrylamide,

b) 50 to 80% by weight of vinylpyrrolidone and/or vinylcaprolactam, and

c) 0.5 to 5% by weight of vinylimidazole and/or derivatives thereof.

14. A process for the preparation of copolymer A), as claimed in claim 5 , by free-radical polymerization of the monomers a) with at least one further monomer chosen from the monomers b) and c), optionally in the presence of up to 25% by weight, based on the total weight of components a) to b), of a water-soluble component d), wherein the polymerization is carried out in an aqueous solvent.

15. The process as claimed in claim 14 , wherein the polymerization is carried out at a pH in the range from 6 to 8.

16. The process as claimed in claim 15 , wherein the polymerization is carried out at a pH in the range from 6.4 to 7.4.

17. A method of coating a substrate, comprising applying the copolymer as claimed in claim 5 to a substrate.

18. The method as claimed in claim 17 , wherein the substrate comprises a solid medicament, a textile, paper, a printable source or leather.

19. A method of making a pharmaceutical composition, comprising adding the copolymer, as claimed in claim 5 , as an auxiliary, to one or more pharmaceutical components.

20. A method of making a composition, comprising contacting the copolymer A), as claimed in claim 5 , with one or more additives.