Purification process of PTFE using fiber bed and heated air
US5391709A · kind A · utility
14Cited by
1References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1993 |
| Grant date | Feb 21, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F6/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polytetrafluoroethylene coagulate obtained from aqueous dispersion polymerization of tetrafluoroethylene in the presence of volatile initiator, surfactant, and possibly wax, is purified of these contaminants by exposing the coagulate to heated air with the coagulate being formed as a shallow bed on a fabric of polymer filament, the heated air passing through the bed from top to bottom to volatilize the contaminants including the water content of the coagulate and thereby cause them to leave the bed through openings in the fabric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.