Composite membrane and process for producing the same

Details Composite membrane and process for producing the same Composite membrane and process for producing the same

1984-10-23

1986-10-21

Schofer, Joseph L.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

4283155, 4283157, 521 27, 525431, B32B 326, C08D 520

Patent

active

046185348

ABSTRACT:
A composite membrane and a process for producing the same are described. This composite membrane comprises a polyimide resin anisotropic membrane and a cross-linked silicone resin thin film formed on the anisotropic membrane, the anisotropic membrane comprising a dense surface layer and a porous layer continuously connected thereto and the polyimide resin consisting essentially of a repeating unit of the formula: ##STR1## wherein A and R.sup.1 are the same as defined hereinbefore. This composite membrane is useful for separation of organic solutions containing relatively small solutes of molecular weight of the order of 10 to 1,000 liquid/liquid separation, and concentration and separation of gases.

REFERENCES:
patent: 3781237 (1973-12-01), Alvino et al.
patent: 4240914 (1980-12-01), Iwama et al.
patent: 4393113 (1983-07-01), Sugie et al.
patent: 4483901 (1984-11-01), Okita et al.

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