Oil-, water- and soil-repellent perfluoroalkylethyl methacrylate copolymers

1. A copolymer containing, based on the total weight of the copolymer:

a) 40 to 97 wt % of a perfluoroalkylethyl methacrylate mixture,

b) 1 to 50 wt % of a C 12 -C 22 alkyl (meth)acrylate and

c) 0.5 to 10 wt % of at least one thermally crosslinkable or isocyanate-reactive monomer, and

d) 1.5 to 50 wt % of vinyl chloride and/or vinylidene chloride;

wherein the perfluoroalkyl group of the perfluoroalkylethyl methacrylate conforming to the formula

R F CH 2 CH 2 OCOC(CH 3 )═CH 2

contains

1 to 10 wt % of 4 or fewer fluorinated carbon atoms and

90 to 99 wt % of 6 fluorinated carbon atoms.

2. A compound according to claim 1 , wherein the C 12 -C 22 alkyl (meth)acrylate is selected from the group consisting of cetyl acrylate, stearyl acrylate behenyl acrylate and mixtures thereof.

3. A process for water-, oil- and soil-repellent finishing of a fibrous substrate comprising the step of contacting the fibrous substrate with at least one copolymer according to claim 1 .

4. An aqueous mixture comprising the copolymer according to claim 1 and a mixture of protected isocyanates.

5. A process for water-, oil- and soil-repellent finishing of a fibrous substrate comprising the step of contacting the fibrous substrate with at least one aqueous mixture according to claim 4 .

6. A copolymer according to claim 1 containing, based on the total weight of the copolymer:

a) 45 to 90 wt % of a perfluoroalkylethyl methacrylate mixture,

b) 5 to 30 wt % of a C 12 -C 22 alkyl (meth)acrylate and

c) 1 to 5 wt % of at least one or more thermally crosslinkable or isocyanate-reactive monomer, and

d) 4 to 30 wt % of vinyl chloride and/or vinylidene chloride.