Patent ID: 6140437
Filing Date: 2000-10-31
Classification: C08F

Abstract:
A fluorine-containing elastomeric copolymer comprising:(a) 55 to 62 mole % of repeating units obtained from tetrafluoroethylene monomer; and(b) 38 to 45 mole % of repeating units obtained from perfluoro(methyl vinyl ether) monomer; andwherein said copolymer is obtained by radically polymerizing said monomers in the presence of a diiodide compound of the formulaRI.sub.2,wherein R is a saturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, or R is a hydrocarbon group having 1 to 3 carbon atoms; andwherein said copolymer has a Mooney viscosity (ML.sub.1+10 100.degree. C.) in the range between 20 and 150.