Method of producing microfiltration membranes from aromatic polyamides
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
Jan 22, 1991
filing date -
Jan 27, 1990
priority date (Note) -
Expired
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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.
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