Fluorine-containing copolymer

Abstract

A fluorine-containing copolymer comprising: (a) from 0.05 to 20 mol % of polymer units based on at least one fluorinated comonomer selected from the group consisting of fluorinated comonomers of the following formulae (1), (2) and (3): X--R.sup.f --CY.dbd.CH.sub.2 (1) X--R.sup.f --O--CF.dbd.CF.sub.2 (2) CF.sub.3 --(CF.sub.2).sub.n --(O--CF(CF.sub.3)--CF.sub.2).sub.m --O--CF.dbd.CF.sub.2 (3) wherein Y is a fluorine atom or a hydrogen atom, R.sup.f is a C.sub.2-12 bivalent fluorinated organic group, X is a fluorine atom, a chlorine atom or a hydrogen atom, n is an integer of from 0 to 3, and m is an integer of from 1 to 4, (b) from 30 to 85 mol % of polymer units based on tetrafluoroethylene, (c) from 1 to 30 mol % of polymer units based on propylene, and (d) from 5 to 68.5 mol % of polymer units based on vinylidene fluoride.

Dependencies are inferred from the claim text.