Patent ID: 6518380
Filing Date: 2003-02-11
Classification: C08F

Abstract:
Fluorocopolymers obtained by polymerization of a monomer mixture comprising:(a) from 50 to 92% by weight, of at least one polyfluoromonomer of formula: in whichRf represents a perfluorinated radical having a straight or branched chain, containing 2 to 20 carbon atoms, B represents a divalent linking which is linked to O by a carbon atom and comprises at least one oxygen, sulphur and/or nitrogen atom, and 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% by weight, of at least one monomer of formula: in whichBâ€² represents a linear or branched alkylene radical containing 1 to 4 carbon atoms, Râ€² represents a hydrogen atom or an alkyl radical containing 1 to 4 carbon atoms, and the symbols R1 and R2, which are identical or different, each represent a hydrogen atom, a linear or branched alkyl radical containing 1 to 18 carbon atoms or a hydroxyethyl or benzyl radical, or R1 and R2 together with the nitrogen atom to which they are linked form a morpholino, piperidino or pyrrolidin-1-yl radical; (c) from 0.5 to 20%, by weight of a monoolefinic compound of sulphonic acid, or an alkali or alkaline-earth metal salt thereof; (d) from 2 to 10% by weight of a vinyl compound of formula: Râ€³â€”CH&boxH;CH2â€ƒâ€ƒ(IV) in which Râ€³ is an alkyl carboxylate or alkyl ether group containing from 1 to 18 atoms; and(e) from 0 to 10% by weight, of any monomer other than the monomers of formulae I, II, and IV, and a compound of component (c); the said copolymerization comprising: the dissolving of the monomers in a distillable organic solvent; and then the diluting of the reaction mixture with water in the presence of a mineral or organic acid to salify the macromolecules.