Patent ID: 7087694

Claim:
Fluorinated cationic acrylic copolymers obtained by polymerizing a mixture of monomers comprising, by weight: (a) from 50 to 92% of one or more polyfluorinated monomers of general formula: Rf—B—O—C(O)—C(R)═CH—R (I) in which: Rf represents a linear or branched chain perfluorinated radical containing 2 to 20 carbon atoms, preferably 4 to 16 carbon atoms, B represents a bivalent group bonded to O via a carbon atom which may comprise one or more atoms of oxygen, sulphur and/or nitrogen, one of the symbols R represents a hydrogen atom and the other a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms; (b) from 1 to 25% of one or more monomers of general formula: in which B′ represents a linear or branched alkylene radical containing 1 to 4 carbon atoms, R′ represents a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, the symbols R 1 and R 2 , identical or different, each represent a hydrogen atom, a linear or branched alkyl radical containing from 1 to 18 carbon atoms or a hydroxyethyl or benzyl radical, or R 1 and R 2 together with the nitrogen atom to which they are attached form a morpholino, piperidino or 1-pyrrolidino radical; (c) from 0 to 25% of a vinyl derivative of general formula: R″—CH═CH 2 (III) in which R″ can be an alkylcarboxylate or alkylether group containing 1 to 18 carbon atoms, preferably from 1 to 4 carbon atoms; (d) from 0.5 to 20% of a monomer of general formula: in which: R′ is as defined previously, B″ represents B′ as defined previously or a single bond, X represents an oxygen, nitrogen or sulfur atom, R 3 represents a linear or branched alkyl radical comprising 1 to 10 carbon atoms; and (e) from 0 to 10% of any monomer other than the monomers of formulae (I), (II), (III) and (IV); said polymerization comprising: dissolving the monomers in a distillable organic solvent; then diluting the reaction mixture with water in the presence of an inorganic or organic acid in order to form a salt with the macromolecules.