Fluorine containing copolymers and aqueous dispersions prepared therefrom

Fluorine-containing copolymers and aqueous dispersions prepared therefrom containing 5 to 50% by weight relative to the total weight of the dispersions, of ingredients other than water (solid content), wherein the copolymers contain copolymerized comonomers in the following percentages by weight, relative to the total weight of the copolymers:

• a) 45-75% by weight of (meth)acrylates containing perfluoroalkyl groups, of the formula
• C.sub.n F.sub.2n+1 --X--OCO--CR.sup.1 .dbd.CH.sub.2 (I)
• in which
• n represents a number from 4-12,
• R.sup.1 denotes hydrogen or methyl and
• X represents --(--CH.sub.2 --).sub.m --, --SO.sub.2 --NR.sup.2 --CH.sub.2 --CHR.sup.3 or --O--(--CH.sub.2 --).sub.m --, where m denotes a number from 1 to 4, R.sup.2 represents C.sub.1 -C.sub.4 -alkyl and R.sup.3 represents hydrogen or methyl,
• b) 10 to 50% of monomers of the formulae
• CH.sub.2 .dbd.CH--CO--OR.sup.4 (IIa)
• and/or
• CH.sub.2 .dbd.C(CH.sub.3)--CO--OR.sup.12 (IIb),
• in which
• R.sup.4 represents a C.sub.1 -C.sub.22 -alkyl radical and
• R.sup.12 denotes C.sub.2 -C.sub.22 -alkyl
• wherein the monomers (IIa) and/or (IIb) can be completely or partially replaced by one or more monomers of the group consisting of styrene, acrylonitrile, vinyl acetate, vinyl propionate and methyl methacrylate,
• c) 4-30% of monomers of the formula ##STR6## R.sup.5 and R.sup.6 independently represent hydrogen or methyl and R.sup.7 denotes hydrogen or C.sub.1 -C.sub.8 -alkyl and
• p represents a number from 1 to 50, and
• d) 1 to 15% of monomers of the formula
• CH.sub.2 .dbd.CR.sup.11 COO--CH.sub.2 CH.sub.2 --N(R.sup.8,R.sup.9)(IVa)
• in which
• R.sup.8 and R.sup.9 independently of one another denote C.sub.1 -C.sub.4 -alkyl and
• R.sup.11 represents hydrogen or methyl,
• or of monomers of the formula (IVa) in their quaternised form of the formula
• [CH.sub.2 .dbd.CR.sup.11 --COO--CH.sub.2 CH.sub.2 --N(R.sup.8,R.sup.9,R.sup.10).sup..sym. Y.sup..crclbar. (IVb),
• in which additionally
• R.sup.10 denotes C.sub.1 -C.sub.4 -alkyl and
• Y represents an equivalent of a mono- to tri-valent anion,
• or of monomers of the formula (IVa) in their N-oxidised form of the formula ##STR7##