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:
Sep. 11, 1979
Filed:
Jul. 15, 1977
Applicant:
Inventors:
Noriyoshi Tamura, Ami, JP;
Kunio Kihara, Ami, JP;
Assignee:
Mitsubishi Petrochemical Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521 27 ; 264122 ; 264126 ; 264340 ;
Abstract
This invention relates to a process for the production of a heterogeneous ion exchange membrane having a high ion transport number in the presence of a high ion concentration, which comprises mixing a finely powdered ion exchange material with a crystalline polyolefin resin, forming the resultant mixture into a membrane-shaped article and treating the membrane-shaped article with an aqueous solution of at least one salt selected from alkali metal salts and ammonium salts, having a concentration of from 17% by weight to saturation, at a temperature of at least 80.degree. C. for at least 10 minutes.