Method for producing an essentially gas and liquid impermeable l

Details Method for producing an essentially gas and liquid impermeable l Method for producing an essentially gas and liquid impermeable l

1978-01-03

1981-06-09

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264216, 26433112, 521 61, 521 64, 521179, B29D 2700

Patent

active

042724678

ABSTRACT:
Highly useful novel microcellular polymeric structures, especially films and fibers, are prepared from certain solid polymers. Aromatic polysulfones, polyimides, polyhydantoins, polyamides and polyparabanic acid are the preferred ones for the novel structures of the invention.

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patent: 3661859 (1972-05-01), Patton
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patent: 3936584 (1976-02-01), Patton
patent: 4020142 (1977-04-01), Davis et al.
patent: 4026977 (1977-05-01), Bourganel
patent: 4029582 (1977-06-01), Ishii et al.
patent: 4045337 (1977-08-01), Knickel et al.
patent: 4071590 (1978-01-01), Strathmann
patent: 4105616 (1978-08-01), Patton

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