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. 11, 1978
Filed:
May. 24, 1976
Lester T Lee, Parsippany, NJ (US);
Kang-Jen Liu, Somerville, NJ (US);
Allied Chemical Corporation, Morris Township, NJ (US);
Abstract
Novel polyelectrolyte membranes of substantially improved efficiency and durability are prepared from a preswollen film containing a relatively high amount of an insoluble cross-linked aromatic polymer. By preswelling the insoluble matrix under controlled conditions preferably to an equilibrium stage, the dissociable ion-exchange groups may be introduced more uniformly onto the aromatic nuclei of the matrix to a desired depth of the film. Controlled penetration of functional groups is important in preparing high performance cationic, anionic membranes as well as bipolar membranes. The membranes so prepared have low electrical resistance, improved current efficiency, undergo negligible degradation and with excellent durability.