FLUORINE-CONTAINING ELASTIC COPOLYMER, PROCESS FOR THE PRODUCTION THEREOF, AND CROSSLINKED RUBBER ARTICLES

摘要

To provide a fluorinated elastic copolymer excellent in crosslinkability irrespective of the molecular weight and a process for its production, as well as a crosslinked rubber article. A fluorinated elastic copolymer which has iodine atoms, bromine atoms, or both iodine and bromine atoms, at its molecular terminals and which comprises repeating units (a) based on tetrafluoroethylene, repeating units (b) based on a fluorinated monomer having one polymerizable unsaturated bond (provided that tetrafluoroethylene is excluded), and repeating units (c) based on a fluorinated monomer having at least two polymerizable unsaturated bonds, wherein the ratio (molar ratio) of the repeating units (a) to the repeating units (b) is (a)/(b) = 40/60 to 90/10, and the proportion of the repeating units (c) based on the total amount of the repeating units (a) and the repeating units (b) is from 0.01 to 1 mol%.