Process for producing microporous PTFE
US5514231A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1995 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Apr 14, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249978
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A substantially cylindrical bar of microporous PTFE is non-fibrillated and incorporates pores within any cylindrical surface within the bar centred about the central longitudinal axis of the bar that are of substantially uniform size and are substantially uniformly distributed within that surface. The process for producing such a bar includes the step of applying a substantially radial compressive force to pre-heated and cooled granules of PTFE and subsequently re-heating and cooling the compressed granules, while a film of non-fibrillated, microporous PTFE is formed from the cooled bar, the plane of the film being perpendicular to the direction of the radial compressive force whereby the pores within any plane substantially perpendicular to the thickness of the film are of substantially uniform size and are substantially uniformly distributed within that plane and all such parallel planes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.