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:
Nov. 14, 1978
Filed:
Oct. 29, 1976
Applicant:
Inventors:
Assignee:
Nitivy Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ; B01D / ;
U.S. Cl.
CPC ...
521 32 ; 521 33 ; 526 27 ;
Abstract
A partially polyenized polyvinyl alcohol fiber is obtained by heating and dehydration polyvinyl alcohol type fibers at temperatures of about 80.degree. to 350.degree. C so that the dehydration weight loss falls within the range of about 5% to 40%. An ion-exchange radical is introduced into the partially polyenized polyvinyl alcohol fiber to obtain fibers with an ion-exchange capacity. The ion-exchange fiber thus obtained exhibits an exchange capacity comparable to ion-exchange resins and has practical properties as fibers, such as good chemical resistance and flexibility.