METHOD FOR PRODUCING VULCANIZABLE FLUORINE-CONTAINING ELASTOMER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a fluorine-containing elastomer by which the polymerization rate is extremely increased regardless of a small amount of a polymerization initiator by carrying out an iodine transfer polymerization under high pressure, and which has high productivity equal to a method not using the iodine transfer polymerization; and to provide the fluorine-containing elastomer produced by the method.

SOLUTION: The method for producing the fluorine-containing elastomer by a batch-type copolymerization method carried out under a condition of ≥0.95 reduced temperature and ≥0.80 reduced pressure of critical constants calculated by using a Peng-Robinson equation from the critical temperature and the critical pressure of each monomer in the vapor phase part in a reaction vessel, and a composition ratio thereof involves copolymerizing an ethylenically unsaturated compound containing at least one kind of a fluoroolefin and a compound represented by general formula (2) and/or a compound represented by general formula (3): CF2=CF(CX1X2)p(CX3X4)qI in the presence of an iodine compound represented by general formula (1): Rf1×IX.

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