Composite semipermeable membrane and method for producing composite semipermeable membrane
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United States of America
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Dec 14, 2021
Grant Date -
Jun 18, 2020
app pub date -
Jun 29, 2017
filing date -
Jun 29, 2017
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Abstract
The present invention relates to a composite semipermeable membrane including: a supporting membrane including a substrate and a porous supporting layer; and a separation functional layer disposed on the porous supporting layer, in which the separation functional layer includes: a crosslinked polyamide; and a hydrophilic polymer which is a polymer of a monomer having an ethylenically unsaturated group, and a surface of the separation functional layer has a ratio of the number of oxygen atoms to the number of nitrogen atoms (O/N ratio), both determined by X-ray photoelectron spectrometry, of 1.5-10, and a standard deviation of the O/N ratio of 0.15 or larger.
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