Polytetrafluoroethylene porous film and preparation and use ther

Details Polytetrafluoroethylene porous film and preparation and use ther Polytetrafluoroethylene porous film and preparation and use ther

1992-07-22

1993-08-10

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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2642888, 264DIG73, 4283155, 4283157, 428422, 428286, B32B 310, D02J 106

Patent

active

052347397

ABSTRACT:
A polytetrafluoroethylene porous film, which is prepared by stretching a semisintered polytetrafluoroethylene material and heating the stretched material at a temperature higher than the melting point of sintered polytetrafluoroethylene, has an area ratio of fibrils to nodes of from 99:1 to 75:25, an average fibril diameter of from 0.05 to 0.2 .mu.m, a largest node area of not larger than 2 .mu.m.sup.2 and an average pore size of from 0.2 to 0.5 .mu.m and achieves low pressure loss.

REFERENCES:
patent: 3953566 (1976-04-01), Gore
patent: 4187390 (1980-02-01), Gore
patent: 4596837 (1986-06-01), Yamamoto et al.
patent: 4671754 (1987-06-01), Okita et al.
patent: 4743480 (1988-05-01), Campbell et al.
patent: 4877433 (1989-10-01), Oshitari
patent: 4877661 (1989-10-01), House et al.

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