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US 9,283,525 B2Granted
Porous polymer film and production method for porous polymer film
AssigneeDaikin Industries, Ltd.
InventorsYuko Shiotani, Yoshito Tanaka, Jun Miki
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Abstract
The present invention aims to provide a porous polymer membrane that is excellent not only in water permeability and alkali resistance but also in mechanical strength. The porous polymer membrane of the present invention includes a fluoropolymer (A) that includes a vinylidene fluoride unit and a tetrafluoroethylene unit.
Claims10
A porous polymer membrane comprising a fluoropolymer (A) that includes a vinylidene fluoride unit and a tetrafluoroethylene unit,
- wherein the membrane is a hollow fiber membrane,
- wherein the fluoropolymer (A) includes the vinylidene fluoride unit and the tetrafluoroethylene unit in a molar ratio of the vinylidene fluoride unit/tetrafluoroethylene unit of 50 to 90/50 to 10;
- and
- wherein the porous polymer membrane has a surface that has a ratio of oxygen/fluorine content (0/F) on the surface of not less than 0.050 but not more than 0.118 when measured by X-ray photoelectron spectroscopy (XPS).
1 more element
Dependencies are inferred from the claim text.