Porous PTFE structures

Details Porous PTFE structures Porous PTFE structures

1995-05-02

1997-10-14

Watkins, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428402, 428323, 428327, 4283084, 4283157, 4283179, 4283184, 4283044, 428240, 428245, 428256, 428283, 428290, 428463, 428520, 428522, 428516, 428332, 428218, 428215, 55522, 55524, 210503, 210506, 2105101, 521145, 521919, C08J 924, B32B 326

Patent

active

056770316

ABSTRACT:
A porous polytetrafluoroethylene (PTFE) structure particularly for use as a liquid filter comprises particles of granular-type PTFE fused together to form a porous integral network. The structure is formed by spraying an aqueous suspension of granular PTFE particles and baking at a temperature of 335.degree.-350.degree. C. Typically the specific gravity is 0.8 to 1.54. The crystallinity is less than 95%. The structure may be supported on a perforate substrate such as stainless steel mesh.

REFERENCES:
patent: 2936301 (1960-05-01), Thomas et al.
patent: 3087921 (1963-04-01), Mathews et al.
patent: 3558583 (1971-01-01), Alsup et al.
patent: 3968297 (1976-07-01), Sauer
patent: 3981852 (1976-09-01), Manwiller et al.
patent: 3986851 (1976-10-01), Grodek
patent: 4766188 (1988-08-01), Attwood et al.
patent: 4834847 (1989-05-01), McIntyre
Chemical Abstracts, vol. 92, 1980, p. 38, 92:95225p.

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