| abstract |
PROBLEM TO BE SOLVED: To provide a fluorine-containing elastomeric material excellent in processability and crosslinkability and a composition for crosslinking while maintaining mechanical properties and heat resistance. (A) Formula (I): (Wherein, Rf is a perfluoroalkylidene group or a perfluorooxyalkylidene group; X is a CN group, COOH A fluorine-containing vinyl ether monomer (Ia) having a peak at -143 ppm to -145 ppm in 19 F-NMR and a structural isomer of the fluorine-containing vinyl ether monomer (Ia) And 19 F-NM R is a mixture with a fluorinated vinyl ether monomer (Ib) having a peak at -141 ppm to -142 ppm, wherein the mixing ratio of the fluorinated vinyl ether monomer (Ib) / (Ia) is -141 ppm to -142 ppm. Peak intensity / 0.1 at a peak intensity ratio of -143 ppm to -145 ppm. 02 or more fluorine-containing vinyl ether monomer mixture, (B) a process for producing a fluorine-containing elastomeric copolymer obtained by copolymerizing the fluorine-containing vinyl monomer except for the fluorine-containing vinyl ethers (Ia) and (Ib), and (C) optionally, a non-fluorine-based monomer . |