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US 12,569,812 B2Granted
Bipolar membrane
AssigneeAstom Corporation
InventorsMasayuki Kishino, Kouta Yuzuki, Kenji Fukuta
Life of this patent
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Abstract
A bipolar membrane in which a cation-exchange membrane and an anion-exchange membrane are joined to each other, wherein a leakage ratio of gluconic acid at 60° C. is not more than 1.0%, and the cation-exchange membrane is supported by a polyolefin reinforcing member and, further, contains a polyvinyl chloride.
Claims6
A method of producing a bipolar membrane including a step of forming a cation-exchange membrane, and a step of forming an anion-exchange membrane on the surface of said cation-exchange membrane;
- wherein
- the step of forming said cation-exchange membrane includes:
- a step of impregnating a polyolefin reinforcing member with a polymerizable composition obtained by mixing a polyvinyl chloride (A) and a polymerization-curable component(B) that contains a monomer (b1) having a cation-exchange group or a monomer (b2) having a reaction group capable of introducing a cation-exchange group;
- and
- a step of forming a membrane of a cation-exchange resin that contains the polyvinyl chloride or of a cation-exchange resin precursor resin by polymerization-curing said polymerizable composition at a temperature of not lower than 100° C.;
- and, further, as required,
- a step of introducing a cation-exchange group into the cation-exchange resin precursor resin.
4 more elements
Dependencies are inferred from the claim text.