Production of porous sintered PTFE products

Details Production of porous sintered PTFE products Production of porous sintered PTFE products

1976-12-17

1978-08-29

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Autogenously or by activation of dry coated particles

264 41, 264DIG47, B29D 724, B29D 2700

Patent

active

041103920

ABSTRACT:
The present invention provides porous polytetrafluoroethylene ("PTFE") products having fine pores and high porosity, the pore diameter being less than about 1,500A, generally ranging from about 100A to 1,000A. The process for the manufacture of these products comprises: (a) shaping of a lubricated PTFE mixture, by extrusion and/or rolling; (b) a first stretching of the shaped mass while in an unsintered state; (c) free sintering of the stretched mass at a temperature above 327.degree. C; and (d) a second stretching of the sintered mass. These porous PTFE products are suitable for use as gas separators, diaphragms, filters, and other applications.

REFERENCES:
patent: 2776465 (1957-01-01), Smith

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