Method for emulsion polymerization of tetrafluoroethylene and method for prevention of irregular polymerization thereof
US5814713A · kind A · utility
0Cited by
9References
21Claims
0Family size
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Key dates
| Filing date | Aug 6, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Aug 6, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F14/26
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
(i) A method for emulsion polymerization of tetrafluoroethylene, which comprises emulsion-polymerizing tetrafluoroethylene in the presence of a polymerization initiator, a paraffin wax containing not larger than 100 ppm of a reducing substance and an emulsifier, and (ii) a method for preventing irregular polymerization of tetrafluoroethylene, which comprises using the above method for emulsion polymerization give a constant polymerization time, and polytetrafluoroethylene having values of physical properties which meet the desired standard requirements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.