SEPARATION MEMBRANE AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2022/249839

A1

For the purpose of providing a separation membrane which is excellent in terms of low fouling properties, separation performance and water permeability, while having high chemical resistance, a separation membrane according to the present invention comprises a porous resin layer that contains a polymer which is mainly composed of a polyvinylidene fluoride resin, and this separation membrane is configured such that: with respect to the porous resin layer, the number A of pores having a surface pore diameter of not less than 0.01 μm but less than 0.05 μm and the number B of pores having a surface pore diameter of 0.05 μm or more satisfy the relational expression 2.0 ≤ A/B ≤ 15.0; and the void fraction of macrovoids having a breadth of 10 μm or more in a region from the surface to the depth of 15 μm of the porous resin layer is from 15% to 80%.

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KATO SATOSHI (JP)
NISHIGUCHI YOSHIKI (JP)

PCT/JP2022/018864

December 01, 2022

April 26, 2022

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TORAY INDUSTRIES (JP)

B01D61/18; B01D69/00; B01D69/02; B01D69/10; B01D69/12; B01D71/34; C02F1/44; C02F3/12

JP2010221218A	2010-10-07
JP2007283287A	2007-11-01
JP2020104104A	2020-07-09
JP5310658B2	2013-10-09
JP2016510688W

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