Monoaxially stretched shaped article of polytetrafluoroethylene and process for producing the same
US5167890A · kind A · utility
41Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1990 |
| Grant date | Dec 1, 1992 |
| Priority date | — |
| Expiry date | Mar 26, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2327/18
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
To produce a monoaxially stretched shaped article of polytetrafluoroethylene (PTFE), a pasty mass containing PTFE powder is continuously shaped to a shaped body, which is fed over a plurality of rollers or rolls, heated and stretched. The shaped body is heated to a temperature of between 327.degree. and 450.degree. C. prior to stretching strain, it is sintered simultaneously and is then stretched. This process allows for the production of a monoaxially stretched shaped article of PTFE which has strength values in the stretching direction of at least 500 N/mm.sup.2 and a delivery of between 1.80 and 2.30 g/cm.sup.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.