Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1986-02-10
1987-09-15
McCamish, Marion C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
427195, 427267, 428288, 428290, 428421, 428422, B32B 506
Patent
active
046939288
ABSTRACT:
A process for making a porous, fibrous structure coated with a fluorocarbon polymer comprising (1) preparing an aqueous slurry of inorganic fibers and fluorocarbon polymer; (2) precipitating the fluorocarbon polymer onto the inorganic fibers by lowering the pH of the slurry to an acidic value and adding a cationic flocculant; (e) forming a porous, fibrous structure from the resulting slurry; and (4) drying and heat treating the resulting structure. The porous, fibrous structure comprises inorganic fibers the surfaces of which are coated with a precipitated fluorocarbon polymer with the fibers secured to one another at cross-over points by the fluorocarbon polymer thereby providing structural integrity.
REFERENCES:
patent: 2712509 (1955-07-01), Biefeld
patent: 3928703 (1975-12-01), Cook
patent: 4131711 (1978-12-01), Attwood
patent: 4169754 (1979-10-01), Perrotta
patent: 4272294 (1981-06-01), Juanarajs
patent: 4507337 (1985-03-01), Yamaguchi et al.
patent: 4523995 (1985-06-01), Pall et al.
McCamish Marion C.
Pall Corporation
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