Process for preparing selective permeable membrane

Details Process for preparing selective permeable membrane Process for preparing selective permeable membrane

1980-10-08

1983-10-18

Lawrence, Evan K.

Coating processes

Foraminous product produced

Filter, sponge, or foam

264 41, 427246, 427352, 427353, B05D 500

Patent

active

044105681

ABSTRACT:
A process for preparing a selective permeable membrane having self-supporting property, which comprises coating on a supporting substrate a dope comprising a polyimide polymer consisting essentially of a repeating unit of the formula: ##STR1## wherein R is a divalent organic group, an inorganic salt and an organic solvent, as a dope solvent, which dissolves a mixture of the polymer and the inorganic salt to form a homogeneous system, to prepare a dope coated supporting substrate, heat treating the substrate at a temperature which does not cause the organic solvent in the dope to boil, and then coagulating the substrate.

REFERENCES:
patent: 3567810 (1971-03-01), Baker
patent: 3816303 (1974-06-01), Wrasudlo
patent: 3899309 (1975-08-01), Hoehn et al.
patent: 3925211 (1975-12-01), Schumann et al.

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