Asahi Kasei Kabushiki Kaisha

Takuya Morikawa

Atsushi Nakajima

Naoki Sakamoto

Yoshifumi Kado

Toshinori Hirano

Hiroyuki Kameyama

Ryuji Ohashi

Takuo Sawada

An ion exchange membrane includes a layer S including a fluorine-containing polymer having a sulfonic acid group, a layer C including a fluorine-containing polymer having a carboxylic acid group, and a plurality of strengthening materials arranged inside the layer S and functioning as at least one of reinforcement yarn and sacrifice yarn. A and B satisfy following formulas:&#x2264;240 &#x3bc;m&#x2003;&#x2003;(1)2.0&#x2264;&#x2264;5.0&#x2003;&#x2003;(2)

Ion exchange membrane and electrolyzer

[Problem to be Solved] A cation exchange membrane that has sufficient mechanical strength and at the same time has high impurity resistance, suffers little cathode surface damage, and exhibits stable electrolytic characteristics is provided. [Solution] A cation exchange membrane comprising:

Cation exchange membrane and electrolyzer

The ion exchange membrane according to the present invention comprises a layer A comprising a fluorine-containing polymer having a sulfonic acid group and a layer B comprising a fluorine-containing polymer having a carboxylic acid group, wherein the layer B has a value of an ion cluster diameter distribution M represented by the following formula (B) of greater than 10:=()/(&#x3c3;)&#x2003;&#x2003;(B)wherein M represents an ion cluster diameter distribution, arepresents an average ion cluster radius, and &#x3c3; represents a standard deviation of an ion cluster radius.

Ion exchange membrane

The ion exchange membrane according to the present invention comprises a layer A comprising a fluorine-containing polymer having a sulfonic acid group and a layer B comprising a fluorine-containing polymer having a carboxylic acid group, wherein a ratio of an ion cluster diameter of the layer B after electrolysis under the following electrolysis conditions to the ion cluster diameter of the layer B before the electrolysis [(the ion cluster diameter of the layer B after the electrolysis)/(the ion cluster diameter of the layer B before the electrolysis)] is 0.83 to 0.95: (Electrolysis Conditions) in a zero-gap base electrolytic cell where the ion exchange membrane is disposed between an anode chamber to which a 3.5 N aqueous sodium chloride solution is supplied and a cathode chamber to which a 10.8 N aqueous sodium hydroxide solution is supplied, electrolysis is performed for 7 days under conditions having a temperature of 85&#xb0; C. and a current density of 6 kA/m.

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Tokyo, Japan

Takuya Morikawa