Polymer separation membrane and process for producing the same

摘要

The invention provides a polymer separation membrane that is excellent in separating characteristics, a permeating ability, a chemical strength (particularly chemical resistance) and a physical strength, and also excellent in a stain resistance, and a producing method therefor. The fluorinated resin-type polymer separation membrane includes a layer having a three-dimensional network structure, and a layer having a spherical structure, wherein the layer of three-dimensional network structure is formed by a fluorinated resin-type polymer composition containing a hydrophilic polymer, and the hydrophilic polymer is a substantially water-insoluble hydrophilic polymer containing at least one of a cellulose ester, an aliphatic vinyl ester, vinylpyrrolidone, ethylene oxide and propylene oxide as a polymerization component. The polymer separation membrane is applicable as a filtration membrane for water treatment, a battery separator, a charged membrane, a fuel cell membrane or a blood cleaning filtration membrane.

主权项

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.