Process for producing porous products

Details Process for producing porous products Process for producing porous products

1973-07-03

1976-04-27

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Reshaping running or indefinite-length work

264175, 264210R, 264290R, B29D 724

Patent

active

039535665

ABSTRACT:
This invention provides a tetrafluoroethylene polymer in a porous form which has an amorphous content exceeding about 5% and which has a micro-structure characterized by nodes interconnected by fibrils. The material has high porosity and high strength. It can be used to produce all kinds of shaped articles such as films, tubes, rods, and continuous filaments. Laminations can be employed and impregnation and bonding can readily be used to produce a large variety of articles. Compressed articles of very high strength can also be produced from these porous forms.

REFERENCES:
patent: 2915786 (1959-12-01), Haroldson et al.
patent: 2953428 (1960-09-01), Hunt et al.
patent: 3054761 (1962-09-01), Moore et al.
patent: 3544671 (1970-12-01), Sandiford
patent: 3634564 (1972-01-01), Okamoto et al.
patent: 3637906 (1972-01-01), Parathoen
patent: 3664915 (1972-05-01), Gore
patent: 3813461 (1974-05-01), Murayama et al.
"Unsintered Tape Manufacture Calendering Round Rods" DuPont Co. Plastics Dept., TR No. 148, 2-16-1973.

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