Co-vulcanizable compositions of fluoroelastomers having improved chemical stability

Abstract From the Canadian patent

Co-vulcanizable compositions comprising (A) 55-85% by weight of a fluoroelastomeric copolymer of vinylidene fluoride with perfluoropropene and possibly tetrafluoroethylene; (B) 45- 15% by weight of a copolymer of tetrafluoroethylene and propylene; (C) 0.7-2.5 parts, per 100 parts of (A)+(s) blend of, a bisphenolic compound; (D) 0.3-1.5 parts per 100 parts of, (A)+(B) blend, of a quaternary ammonium phosphonium or, aminophosphonium organic compound; (E) 0.4-5 parts per 100 parts, of (A)+(B) blend, of an organic peroxide; (F) 1-5% by weight as, referred to (A)+(B), of a peroxidic cross-linking coagent. The compositions which are useful in the automobile and the oil receiving fields have …