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:
Apr. 28, 1992
Filed:
Feb. 17, 1989
Applicant:
Inventors:
Assignee:
Japan Exlan Company Limited, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
521 32 ; 521 28 ; 521 30 ; 521 31 ;
Abstract
The present invention provides cation exchange fibers having a high capacity of ion exchange and a high utilization rate of ion exchange radicals. The fibers are produced so as to have 3 m eq/g or more of carboxyl groups introduced by simultaneous crosslinking and hydrolyzing treatments of acrylic fibers, and to have tensile strength 1 g/d or more and a degree of water-swellability less than 100%, while maintaining fiber properties without problems in practical use.