COMPOSITE SEMIPERMEABLE MEMBRANE AND METHOD OF MANUFACTURING SAME
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United States of America Patent
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Nov 20, 2014
app pub date -
Jan 16, 2013
filing date -
Jan 16, 2012
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Abstract
A composite semipermeable membrane includes: a supporting membrane having a substrate and a porous supporting layer; and a separation functional layer provided on the supporting membrane, in which, when any 10 cross sections of the composite semipermeable membrane, having a length of 2.0 μm in a membrane surface direction, are observed using an electron microscope, an average number density of projections on the separation functional layer, which have a height equivalent to or higher than ⅕ of a 10-point average surface roughness of the separation functional layer, is 10.0 pieces/μm or more, in each cross section, and an average height of the projections is 100 nm or more.
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