Porous membrane and production process thereof

Details Porous membrane and production process thereof Porous membrane and production process thereof

1990-05-29

1992-05-12

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050028, 427245, B01D 6700

Patent

active

051124874

ABSTRACT:
The present invention relates to a porous membrane which has excellent durability and is useful for ultrafiltration. The porous membrane of the present invention has heterogeneous structure, which consists essentially of a phenylenesulfide-based copolymer of the formula:
(Ph--S--Ph--X--).sub.q --
(wherein Ph represents phenylene group, X represents --SO.sub.2 -- or --CO--, and g represents an integer from 80-400 which membrane has a dense layer on one or both surfaces of the membrane, the dense layer controlling the separation performance of the membrane, and a porous layer next to the dense layer, which porous layer has a porosity higher than that of the dense layer.

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