Process for the manufacture of asymmetric, porous membranes, and

Details Process for the manufacture of asymmetric, porous membranes, and Process for the manufacture of asymmetric, porous membranes, and

1986-03-24

1989-09-12

Spear, Frank

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Including surface treatment of porous body

21050035, 21050041, 21050043, 264146, 2642095, B01D 1300

Patent

active

048657859

ABSTRACT:
A process for the production of asymmetric, porous membranes is disclosed which comprises extruding liquified polymer in tubular form and while expanding said film during processing, subjecting it to conditions such that the inside and outside surfaces of the film receive distinct treatments.

REFERENCES:
patent: 3121762 (1964-02-01), Hafstad et al.
patent: 4034055 (1977-07-01), Strutzel et al.
patent: 4066731 (1978-01-01), Hungerford
patent: 4364759 (1982-12-01), Brooks et al.
patent: 4454085 (1984-06-01), Schindler et al.
patent: 4545910 (1985-10-01), Marze
patent: 4594207 (1986-06-01), Josefiak et al.
patent: 4629563 (1986-12-01), Wrasidlo

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