Method of producing microfiltration membranes from aromatic poly

Details Method of producing microfiltration membranes from aromatic poly Method of producing microfiltration membranes from aromatic poly

1991-01-22

1992-08-18

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264216, 264232, 264340, 21050038, B29C 6720

Patent

active

051397129

ABSTRACT:
A process for the manufacture of microfiltration membranes from aromatic polyamides, of which the pore sizes are between 0.05 and 10 .mu.m. A copolymer of isophthalic acid and m-phenylenediamine is dissolved in a solvent mixture of dimethylacetamide and dimethylformamide in the presence of alkali or alkaline earth chlorides and polyethyleneglycol. This solution is produced without the addition of water and is subsequently poured out onto a smooth surface formed of chemically inert material with the formation of the membranes. The water that is required as the precipitation agent, is only added to the poured-out solution by means of the air humidity. The relative air humidity is increased from 30% to 100% during formation of the membranes.

REFERENCES:
patent: 3993625 (1976-11-01), Kurihara et al.
patent: 4229291 (1980-10-01), Walch et al.
patent: 4567009 (1986-01-01), Badenhop et al.

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