Process for producing a high strength porous polytetrafluoroethylene product having a coarse microstructure
US4482516A · kind A · utility
259Cited by
13References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 1982 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Sep 10, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Porous polytetrafluoroethylene materials having high strength and coarse microstructure are produced by densifying the materials after removal of lubricant and then stretching. The term, "coarse," is used to indicate that the nodes are larger, the fibrils are longer, and the effective pore size is larger than conventional materials of the same matrix tensile strength. Densification can be achieved through the use of such devices as a densification die, a calender machine, or a press. This invention can be used to produce all kinds of shaped articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.