Process for preparing a propylene-tetrafluoroethylene copolymer

Details Process for preparing a propylene-tetrafluoroethylene copolymer Process for preparing a propylene-tetrafluoroethylene copolymer

1977-01-27

1981-07-07

Henderson, C. A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

2041592, 260 296F, 260 4227, 526255, C08F 226, C08F21426

Patent

active

042775868

ABSTRACT:
Propylene and tetrafluoroethylene are copolymerized at the low temperature of 0.degree.-50.degree. C. in an aqueous medium in the presence of a specific redox catalyst system. The specific redox catalyst system comprises (1) a water soluble inorganic persulfate, (2) a water soluble thiosulfate or bisulfite and (3) a water soluble iron salt, and preferably further comprises a reducing sugar and a water soluble pyrophosphate. The propylene-tetrafluoroethylene copolymer having high molecular weight and low Mooney viscosity can be prepared at high copolymerization reaction rates.

REFERENCES:
patent: 2720510 (1955-10-01), Rothlisberger
patent: 3467635 (1969-09-01), Brasen
patent: 3560466 (1971-02-01), Bjornson
patent: 3654245 (1972-04-01), Kometani
patent: 3726483 (1973-04-01), Kometani
patent: 3825510 (1974-07-01), Yamamoto
patent: 3892641 (1975-07-01), Tabata

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