Method of making membranes for gas separation and the composite membranes
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United States of America Patent
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Jul 29, 1986
Issued Date -
N/A
app pub date -
Mar 7, 1985
filing date -
Nov 9, 1984
priority date (Note) -
Expired
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Abstract
Composite membranes suitable for separating gas mixtures are made by in situ crosslinking of aminoorganofunctional polysiloxane, 1 to 9 mol percent aminosiloxane units, with diisocyanate on the surface of a highly porous polymer substrate, such as polysulfone. Using the crosslinked polysiloxane as a gutter layer, a gas separating entity can be coated on the gutter layer to make a double layer composite membrane which has a higher separation factor than the crosslinked polysiloxane and can be used effectively for flat sheet membranes, as well as, hollow fiber membranes.
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