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

Filed on

1989-02-17

Date issued

1989-12-05

Examiner

Spear, Frank

Patent Class

Liquid purification or separation

SubClass

Filter

SubSubClass

Material

Other Related Categories

21050043, B01D 1300

Type

Patent

Status

active

Patent number

048850926

Description

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: 3615024 (1971-10-01), Michaels
patent: 4409162 (1983-10-01), Takao
patent: 4545910 (1985-10-01), Marze
patent: 4629563 (1986-12-01), Wrasidlo

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