Copolymers for cosmetic applications

1. An aqueous skin or hair cosmetic preparation comprising at least one polymer A which comprises, in copolymerized form:

a) methyl methacrylate;

b) acrylic acid and methacrylic acid;

c) at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer which comprises no silicone groups

wherein said at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer is a urethane (meth)acrylate monomer comprising, in incorporated form,

1) at least one monomer comprising at least one active hydrogen atom and at least one free-radically polymerizable α,β-ethylenically unsaturated double bond per molecule,

2) at least one diisocyanate, and

3) at least one compound comprising two active hydrogen atoms per molecule,

and salts thereof,

wherein said at least one compound comprising two active hydrogen atoms per molecule is a polyesterdiol III having a number-average molecular weight in the range from about 400 to about 5000; and

d) optionally further free-radically polymerizable compounds.

2. The aqueous skin or hair cosmetic preparation of claim 1 , wherein said at least one polymer A comprises, in copolymerized form,

a) 50-95% by weight of methyl methacrylate;

b) 4-30% by weight of acrylic acid and methacrylic acid;

c) 0.1-20% by weight of at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer which comprises no silicone groups

wherein said at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer is a urethane (meth)acrylate monomer comprising, in incorporated form,

1) at least one monomer comprising at least one active hydrogen atom and at least one free-radically polymerizable α,β-ethylenically unsaturated double bond per molecule,

2) at least one diisocyanate, and

3) at least one compound comprising two active hydrogen atoms per molecule,

and salts thereof,

wherein said at least one compound comprising two active hydrogen atoms per molecule is a polyesterdiol III having a number-average molecular weight in the range from about 400 to about 5000; and

d) 0-30% by weight of further free-radically polymerizable compounds; with the proviso that the amounts of a), b), c), and d) add up to 100% by weight.

3. The aqueous skin or hair cosmetic preparation of claim 2 , wherein said at least one polymer A comprises, in copolymerized form,

a) 65-85% by weight of methyl methacrylate;

b) 10-30% by weight of acrylic acid and methacrylic acid;

c) 0.5-10% by weight of at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer which comprises no silicone groups

wherein said at least one olefinically unsaturated free-radically polymerizable urethane-group-containing monomer is a urethane (meth)acrylate monomer comprising, in incorporated form,

1) at least one monomer comprising at least one active hydrogen atom and at least one free-radically polymerizable α,β-ethylenically unsaturated double bond per molecule,

2) at least one diisocyanate, and

3) at least one compound comprising two active hydrogen atoms per molecule,

and salts thereof,

wherein said at least one compound comprising two active hydrogen atoms per molecule is a polyesterdiol III having a number-average molecular weight in the range from about 400 to about 5000; and

d) 0-30% by weight of further free-radically polymerizable compounds;

with the proviso that the amounts of a), b), c), and d) add up to 100% by weight.

4. The aqueous skin or hair cosmetic preparation of claim 1 , wherein said at least one polymer A comprises, in copolymerized form,

a) 70-80% by weight of methyl methacrylate;

b) 15-28% by weight of acrylic acid and methacrylic acid;

c) 0.5-5% by weight of urethane-group-containing (meth)acrylates comprising, in incorporated form,

1) at least one monomer comprising at least one active hydrogen atom and at least one free-radically polymerizable α,β-ethylenically unsaturated double bond per molecule,

2) at least one diisocyanate, and

3) at least one compound comprising two active hydrogen atoms per molecule,

and salts thereof,

wherein said at least one compound comprising two active hydrogen atoms per molecule is a polyesterdiol III having a number-average molecular weight in the range from about 400 to about 5000;

d) 0-30% by weight of further free-radically polymerizable compounds;

with the proviso that the amounts of a), b), c), and d) add up to 100% by weight.

5. The aqueous skin or hair cosmetic preparation of claim 1 , wherein said preparation comprises, apart from water, at least one further cosmetically acceptable carrier B) which is selected from the group consisting of

i. water-miscible organic solvents;

ii. oils, fats, waxes;

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

iv. saturated acyclic and cyclic hydrocarbons;

v. fatty acids;

vi. fatty alcohols;

vii. propellants; and

viii. mixtures thereof.

6. The aqueous skin or hair cosmetic preparation of claim 5 , wherein i. is C 2 -C 4 -alkanols.

7. The aqueous skin or hair cosmetic preparation of claim 5 , wherein i. is ethanol.

8. The aqueous skin or hair cosmetic preparation of claim 1 , wherein said preparation is in the form of a spray product, wherein said preparation is present either in combination with a mechanical pump spray device or in combination with at least one propellant selected from the group consisting of propane, butane, dimethyl ether, fluorinated hydrocarbons, and mixtures thereof.