Process for producing propylene-tetrafluoroethylene copolymer
US4463144A · kind A · utility
25Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1982 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Mar 15, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/915
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.