Astom Corporation

Asahi Kasei Kabushiki Kaisha

Toshio Aritomi

Minoru Yoshida

Masayuki Kishino

Ikuo Ueno

Kazunori Nishio

Kazuo Mizuguchi

Nobuhiko Ohmura

Minoru Kawashima

Eiji Asada

Masayuki Adachi

Tatsuhiko Miya

Kiyotaka Yoshie

An ion-exchange membrane including a porous unstretched polyethylene sheet in which fine pores are piercing, the pores being filled with an ion-exchange resin. The ion-exchange membrane exhibits excellent concentration property.

Ion-exchange membrane

To provide a bipolar membrane featuring improved adhesion between an anion-exchange membrane and a cation-exchange membrane without accompanied by an increase in the membrane voltage. [Means for Solution] A bipolar membrane comprising a cation-exchange membrane and an anion-exchange membrane joined together facing each other, wherein at least one of the ion exchange membranes contains a chlorinated polyolefin.

Bipolar membrane and method of manufacturing the same

[Problems] To provide an ion exchanger having excellent electric properties, a low electric resistance, excellent mechanical strength and, at the same time, having excellent contamination resistance. [Means for Solution] An ion exchanger comprises a melt-extrusion-formed body of a resin composition containing a granular ion-exchange resin and a low-melting polyolefin resin having a melting point of not higher than 170&#xb0; C., the melt-extrusion-formed body: (a) containing the granular ion-exchange resin at a ratio of not less than 30% by weight but less than 50% by weight, and the low-melting polyolefin resin in an amount of more than 100 parts by weight but not more than 150 parts by weight per 100 parts by weight of the granular ion-exchange resin; (b) having a melt index in a range of 1 to 5 g/10 min. as measured at 190&#xb0; C.; and (c) having a water content of not less than 30%.

Ion exchanger and method of producing the same

Growing community of inventors

Shunan, Japan

Toshio Aritomi