Separation membrane and method for producing same
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United States of America Patent
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Jul 7, 2020
Grant Date -
Jun 8, 2017
app pub date -
Jul 7, 2015
filing date -
Jul 7, 2014
priority date (Note) -
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Abstract
An object of the present invention is to provide a separation membrane having high mechanical strength and being less likely to cause clogging and capable of continuously maintaining high water permeation performance. The present invention relates to a separation membrane characterized in that the average diameter D1 of a spherical structure in a region within 10 μm from a first surface in a separation membrane having a spherical structure layer formed of a thermoplastic resin and the average diameter D2 of a spherical structure in a region of 10 μm to 20 μm from a second surface satisfy the relational expression of D1>D2 and the average diameter D1 and the average diameter D3 of a spherical structure in a third region satisfy the relational expression of 1.10
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