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:
Jan. 02, 1979
Filed:
Jun. 27, 1977
Applicant:
Inventors:
Toru Seita, Shin-nanyo, JP;
Kenji Takahashi, Shin-nanyo, JP;
Shunichi Asami, Shin-nanyo, JP;
Akihiko Shimizu, Shin-nanyo, JP;
Assignee:
Toyo Soda Manufacturing Co., Ltd., Yamaguchi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; C08F / ; C08J / ;
U.S. Cl.
CPC ...
521 27 ; 20415917 ; 2041 / ; 2105 / ; 260879 ; 260884 ; 526247 ;
Abstract
A cation-exchange membrane is prepared by impregnating a diene monomer having carboxylic acid group or a functional group which can be converted to a carboxylic acid group, into a fluorinated polymer membrane having cation-exchangeable groups; partially polymerizing said diene monomer; swelling the membrane with a water miscible organic solvent and heat-treating the swollen membrane and if necessary, converting the functional groups to carboxylic acid groups.