The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 1983
Filed:
Dec. 08, 1981
Applicant:
Inventor:
Yoshinori Masuda, Yokohama, JP;
Assignee:
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ; C08F / ;
U.S. Cl.
CPC ...
521 27 ; 521 30 ; 20415917 ;
Abstract
There is disclosed a fluorinated cation exchange membrane having a multi-layered structure, of which one layer contains sulfonic acid groups as ion-exchange groups and the other layer contains carboxylic acid groups as principal ion-exchange groups. The membrane is treated with an acid, followed by heat treatment at an elevated temperature in an aqueous atmosphere or aqueous solution whereby improved electrolytic performance such as electrolysis voltage and current efficiency when used in electrolysis of sodium chloride for production of caustic soda is obtained.