Method for preparing semipermeable membrane compositions
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United States of America Patent
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Aug 16, 1988
Grant Date -
N/A
app pub date -
Jun 12, 1987
filing date -
Jun 12, 1987
priority date (Note) -
Expired
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Abstract
Semipermeable membranes with improved permeation flux are prepared by contacting a glassy polymer in the form of a hollow fiber or film with a solvent in which the polymer swells at conditions which permit the swelling solvent to diffuse into the glassy polymer and then stretching the swollen polymer in an amount sufficient to cause visible stress whitening.
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