Nippon Mektron Limited

Shin Okamoto

Masatoshi Abe

Akihiro Naraki

Jun Okabe

A crosslinkable, fluorine-containing elastomer composition containing an organic peroxide having a peroxy group --O--O--C (CH.sub.3).sub.2 R, where R is a lower alkyl group, in the molecule and an activation energy of not more than 34.0 Kcal/mole as a crosslinking agent for a fluorine-containing elastomer containing at least one of iodine and bromine. The organic peroxide reduces an amount of CH.sub.3 I or CH.sub.3 Br to be generated at its decomposition.

Crosslinkable, fluorine-containing elastomer composition

A fluorine-containing elastomer capable of giving a vulcanized product with a good permanent set through peroxide vulcanization is produced by homopolymerization or copolymerization of a fluorine-containing olefin having 2 to 8 carbon atoms in the pressence of an iodine and bromine-containing compound represented by the general formula RBrn Im, where R represents a fluorohydrocarbon group, a chorofluorohydrocarbon group, a chlorohydrocarbon group or a hydrocarbon group, and n and m are integers of 1 and 2, and a small amount of 1,1-difluoro-2-bromoethylene.

Process for producing peroxide-vulcanizable, fluorine-containing

A fluorine-containing elastic copolymer with distinguished low temperature characteristics, comprising (a) about 30 to about 80% by mole of tetrafluoroethylene, (b) about 5 to about 60% by mole of perfluoro(lower alkyl vinyl ether) and (c) a perfluoroether compound represented by following general formula:

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Kitaibaraki, Japan

Shin Okamoto