Tokuyama Soda Kabushiki Kaisha

Koki Hirayama

Fumio Hanada

Nobuhiko Ohmura

Shinsuke Tanaka

Disclosed is a bipolar membrane comprising a cation-exchange membrane in which a cation-exchange group present at least at its adhered surface has been ion-exchanged with a heavy metal ion, which is adhered closely to an anion-exchange membrane at a peel strength of not less than 0.2 kg f/25 mm, and having a water-splitting current efficiency of not less than 80% and a water-splitting membrane potential of not more than 2.0 V.

Bipolar membrane and method for its production

Disclosed is an anion-exchange membrane prepared by subjecting a membrane composed of a resin containing a high-molecular-eight compound having haloalkyl groups chemically bound thereto to ultraviolet radiation or ionizing radiation to thereby decrease the amount of the haloalkyl groups present in its surface portion less than 0.1 micrometer deep from its surface by 10 to 95% from that of the haloalkyl groups present in the interior of the membrane, and the converting the haloalkyl groups present in the membrane into anion-exchange groups.

Growing community of inventors

Tokuyama, Japan

Koki Hirayama