Patent ID: 9259690
Filing Date: 2016-02-16
CPC Classification: B01D,C02F,H01M,Y02E

Claim Text:
1. A polymer separation membrane which is a fluorinated resin-type polymer separation membrane comprising: a layer having a three-dimensional network structure; and a layer having a spherical structure, wherein a ratio (A/B) of an average thickness (A) of the layer having a three-dimensional network structure to an average thickness (B) of the layer having a spherical structure is from 0.07 to 0.25; wherein the layer having a three-dimensional network structure has a thickness of from 10 μm to 80 μm and comprises a fluorinated resin-type polymer composition containing a substantially water-insoluble hydrophilic polymer comprising: (a) a hydrophilic unit derived from at least one of vinylpyrrolidone, ethylene oxide and propylene oxide as a polymerization component, wherein in the water-insoluble hydrophilic polymer, the content of said hydrophilic unit is 50 mol % or less, and a molecular unit other than said hydrophilic unit; or (b) a hydrophilic unit derived from at least one of a cellulose ester and a fatty acid vinyl ester as a polymerization component; wherein the layer having a spherical structure does not substantially contain a hydrophilic polymer but contains a fluorinated resin-type polymer.