Nippon Mektron Limited

E.i. Dupont De Nemours and Company

Yurii Vilovich Zeifman

Haruyoshi Tatsu

Satoru Saito

Sergei Rafailovich Sterlin

Sergei Anatol'evich Postovoi

Viacheslav Alexandrovich Petrov

Paul Raphael Resnick

Sergei Vasil'evich Sokolov

Sergei Arnol'Dovich Postovoi

Alexandre N Kollar

Gennadii Gerskovich Belen'Kii

A process is disclosed for producing (CF ) C&boxH;CH , CF CH&boxH;CF , CF &boxH;C(CF )OCF CHF and C H C(CF )&boxH;CF . The process involves contacting the corresponding fluorocarbon starting material selected from (CF ) CFCH F, (CF ) CHF, (CF ) CFOCF CHF and C H CF(CF ) , in the vapor phase, with a defluorination reagent selected from carbon, copper, iron nickel and zinc at an elevated temperature of at least 300 &deg; C.

Preparation of selected fluoroolefins

A fluorine-containing elastomer composition comprising a fluorine-containing elastomer having a cyano group as a cross-linking agent and a bisamidoxime compound represented by the following general formula as a vulcanizing agent: ##STR1## where n is an integer of 1 to 10, gives vulcanization products having a satisfactory compression set without any problem of processability such as roll kneadability, etc. during the heading or during the vulcanization of the fluorine-containing elastomer having a cyano group as a cross-linkable group.

Fluorine-containing elastomer composition

A fluorine-containing elastomer composition comprising a fluorine-containing elastomer having a cyano group as a cross-linkable group and a bisamidrazone compound represented by the following general formula as a vulcanizing agent: ##STR1## wherein Rf is one of the following groups:

Growing community of inventors

Moscow, Russia

Yurii Vilovich Zeifman