Title:
SEPARATION MEMBRANE AND METHOD FOR PRODUCING SEPARATION MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2021/132399
Kind Code:
A1
Abstract:
The present invention provides a separation membrane that contains, as a major component A, a thermoplastic polymer selected from cellulose esters and polyamides. All regions 1-5 obtained by dividing a prescribed cross-sectional surface of the separation membrane at an equal interval in the thickness direction from one surface of the separation membrane have a number average pore diameter change rate αi of -0.25 to 0.25. At least one of the regions 1-5 satisfies conditions (a) and (b). (a) Area average pore diameter Ds / number average pore diameter Dn is 2.50-6.00. (b) When the average of nearest neighbor distance between adjacent coarse pores having a pore diameter greater than Ds is defined as La, the average number W of fine pores that are located at a distance smaller than La from the center of the respective coarse pores and that have a pore diameter smaller than Dn is 10-30.
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Inventors:
EIMURA HIROKI (JP)
TAKADA KOICHI (JP)
OTSUKA MARINA (JP)
HANAKAWA MASAYUKI (JP)
TAKADA KOICHI (JP)
OTSUKA MARINA (JP)
HANAKAWA MASAYUKI (JP)
Application Number:
PCT/JP2020/048299
Publication Date:
July 01, 2021
Filing Date:
December 23, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
B01D69/00; B01D69/08; B01D71/14; B01D71/22; B01D71/34; B01D71/40; B01D71/44; B01D71/48; B01D71/52; B01D71/56; B01D71/66; D01F2/00
Domestic Patent References:
| WO2018021545A1 | 2018-02-01 | |||
| WO2017131209A1 | 2017-08-03 | |||
| WO2018182027A1 | 2018-10-04 | |||
| WO2018182028A1 | 2018-10-04 |
Foreign References:
| JP2019111476A | 2019-07-11 | |||
| JP2017213515A | 2017-12-07 | |||
| JPS5874327A | 1983-05-04 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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