Porous film of polytetrafluoroethylene and preparation thereof
US5143783A · kind A · utility
14Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | Sep 1, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31544
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A polytetrafluoroethylene porous film obtainable by applying an aqueous dispersion of emulsion polymerized polytetrafluoroethylene particles having an average minor particle size of 1 to 500 nm and an average aspect ratio of at least 10 on a substrate, drying the applied dispersion and optionally sintering the dried polytetrafluoroethylene particles on the substrate to obtain the polytetrafluoroethylene porous film, which has a uniform thin thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.