| abstract |
An elastic fluorocopolymer comprises repeating units (1) based on a fluoromonomer such as tetrafluoroethylene, hexafluoropropylene, vinylidene fluoride or CF 2 ═CF—O—R f (wherein R f is a C 1-8 saturated perfluoroalkyl group or a perfluoro(alkoxyalkyl) group) and repeating units (m) based on the formula CR 1 R 2 ═CR 3 COOCH═CH 2 (wherein each of R 1 and R 2 is a hydrogen atom, a C 1-10 alkyl group or a C 1-10 alkoxyalkyl group containing an etheric oxygen atom, and R 3 is a hydrogen atom, a fluorine atom or a methyl group) in a molar ratio of (m)/((1)=0.0001 to 0.1. Further, an elastic fluorocopolymer composition comprises (A) the above elastic fluorocopolymer, (B) an unsaturated multifunctional compound and (C) a bivalent metal oxide and/or hydroxide. The elastic fluorocopolymer and the elastic fluorocopolymer composition are excellent in the crosslinkability and can provide a crosslinked rubber thereof excellent in crosslinked rubber properties. |