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US 4,463,144 AGranted
Process for producing propylene-tetrafluoroethylene copolymer
AssigneeAsahi Glass Company, Limited
InventorsGen Kojima, Michio Hisasue
Life of this patent
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Abstract
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.
Claims12
A process for preparing a propylene-tetrafluoroethylene copolymer, comprising;
- copolymerizing tetrafluoroethylene and propylene 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 system of (1) a water soluble persulfate, (2) a water soluble iron salt, (3) a hydroxymethanesulfinate and (4) ethylenediamine-tetraacetic acid or salt thereof at a pH of 8 to 10.5 and at a temperature of 0.degree. to 50.degree. C.
Dependencies are inferred from the claim text.