Composite asymmetrical membranes

Details Composite asymmetrical membranes Composite asymmetrical membranes

1975-10-31

1978-01-31

Spear, Jr., Frank A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 41, 260 78TF, 210500M, B01D 3904

Patent

active

040715906

ABSTRACT:
Novel composite asymmetrical membranes, comprising a support membrane and a filtration membrane, and process for making the same. The novel membranes are formed by making a sequence of two-stage membranes, one formed upon the other. The process makes possible the formation of both a support membrane and filtration membrane from the same material rather than, as was necessary in the prior art, formation of a filtration membrane only from a different polymer soluble in solvent media which would have no substantial effect on the support membrane.

REFERENCES:
patent: 3724672 (1973-04-01), Leonard et al.
patent: 3816303 (1974-06-01), Wrasidlo
patent: 3878109 (1975-04-01), Ikeda et al.
patent: 3925211 (1975-12-01), Schumann et al.

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