Asahi Glass Company, Limited

Michio Hisasue

Shun-ichi Kodama

Gen Kojima

Haruhisa Miyake

Masayuki Tamura

Hiroaki Kojima

Masahiko Ichimura

Tetsuya Uchino

A propylene-tetrafluoroethylene copolymer is produced by copolymerizing propylene and tetrafluoroethylene in a molar ratio ranging from 95/5 to 40/60 in an aqueous medium containing tertiary butanol ranging from 5 to 30 wt.%, an emulsifier ranging from 0.01 to 10 wt.% and a redox catalyst of a combination of (1) a water soluble persulfate, (2) a water soluble iron salt, (3) a hydroxymethanesulfinate and (4) ethylenediaminetetraacetic acid or a salt thereof at pH of 8 to 10.5 and at a temperature of 0.degree. to 50.degree. C.

Process for producing propylene-tetrafluoroethylene copolymer

Fluorine-containing elastomers comprise the grafted copolymer havig rubber-like elasticity and having chemical linkages at the reactive sites of fluorine-containing polymeric segments and organopolysiloxane segments.

Fluorine-containing elastomers

Terpolymers of tetrafluoroethylene and ethylene essentially consist of components of from 40 to 60 mole % of tetrafluoroethylene, 40 to 60 mole % of ethylene and 0.1 to 10 mole % of fluorovinyl ether component having the formula

Terpolymers of tetrafluoroethylene, ethylene and fluorovinyl ether and

A fluorocopolymer is produced by copolymerizing a fluoroolefin and cyclohexyl vinyl ether in the presence of a polymerization initiator at -30.degree. to +150.degree. C. at a molar ratio of the fluoroolefin to cyclohexyl vinyl ether in charge of 95:5 to 5:95.

Process for producing fluorocopolymer

A fluoroelastomer is produced by copolymerizing propylene, tetrafluoroethylene and glycidyl vinyl ether in the presence of a polymerization initiator.

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Yokohama, Japan

Michio Hisasue