Alkaline cell with graft polymer separator
AssigneeSac Membrane Products Corporation
InventorWilliam J. Davis
Life of this patent
Estimating the term…
Abstract
A cast film, sheet or coating of a cross-linked graft copolymer of an organic polymeric substrate and an ethylenically unsaturated organic monomer, which is useful as a ion-exchange membrane, particularly a separator for an alkaline battery. The graft copolymer is formed by initiating and effecting the graft copolymerization while the polymeric substrate and monomer are in solution.
Claims12
An alkaline cell, which comprises a positive electrode, a negative electrode, an aqueous alkaline electrolyte, and a separator between said electrodes, said separator comprising a cast sheet of a crosslinked graft copolymer of a polymeric substrate selected from the group consisting of polyolefins, polyamides and poly(vinylhalides) and an ethylenically unsaturated monomer, said cast sheet having been prepared by solvent removal from a layer of a thixotropic suspension of said crosslinked graft copolymer in an organic solvent.
Dependencies are inferred from the claim text.