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:
May. 02, 1989
Filed:
Jul. 13, 1987
Michael J Sansone, Berkeley Heights, NJ (US);
Frank J Onorato, Phillipsburg, NJ (US);
Harry Pulaski, Elizabeth, NJ (US);
Hoechst Celanese Corp., Somerville, NJ (US);
Abstract
A process for sulfonating preformed hydroxyethylated polybenzimidazole fibers is disclosed. The process comprises the steps of forming an hydroxyethylated polybenzimidazole spinning solution; spinning hydroxyethylated polybenzimidazole fibers, sulfonating the fibers by contacting them with a sulfonating agent, and heating the fiber in an inert atmosphere at a temperature and for a period of time sufficient to convert the ionic bonds, formed in the sulfonating step to covalent bonds, thereby, providing a covalently bonded, sulfonated, hydroxyethylated polybenzimidazole fiber. The fibers produced by the process of the present invention exhibit cation selectivity for electrodialysis and electrochemical applications.