Process for producing microporous PTFE

Details Process for producing microporous PTFE Process for producing microporous PTFE

1995-04-14

1996-05-07

Gallagher, John J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156 736, 156 77, 156 83, 156264, 264 41, 264 454, 264127, 4283155, 521 56, 521145, 521919, B27N 300

Patent

active

055142311

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.

REFERENCES:
patent: 3015855 (1962-01-01), Merkel
patent: 3953566 (1976-04-01), Gore

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