| abstract |
Fluorine-containing elastomeric copolymers (I), comprising (a) 45-80 mole% tetrafluoroethylene (TFE), (b) 50-20 mole% perfluoro(vinyl ether) of formula CF2=CFO(CF2)2(OCF2)nOCF3 (II), in which n = 1-5, and (c) 0.2-5 mole% bromine-containing unsaturated monomer. Also claimed is (i) a process for the production of (I) by copolymerisation of the above comonomers, (ii) an elastomeric copolymer composition containing copolymer (I), a polyfunctional unsaturated crosslinker and an organic peroxide, and (iii) a mixture of copolymer (I) and a peroxide-crosslinkable substance. |