Abstract: The invention relates to a semi-permeable membrane for lead-acid batteries. The membrane has a microporous structure comprising a first polymer and a second polymer closely mixed together, the first polymer being poly (2-hydroxyethylmethacrylate), known as reticulated poly HEMA, characterized by the fact that the second polymer comprises one polymer or a mixture of several different polymers chosen from among polyoxyethylene glycol, polyvinylpyrrolidone, polyacrylic acid, polymethacrylic acid, copolymers of acrylic and methacrylic acid, polyacrylates and polymethacrylates of alkyl, and the copolymers of the acrylates and methacrylates of alkyls.
Type:
Grant
Filed:
May 18, 1978
Date of Patent:
September 18, 1979
Assignees:
Compagnie Generale d'Electricite, Institute National de Recherche Chimique Appliquee Ircha
Inventors:
Richard Dick, Georges Feuillade, Robert Gadessaud, Louis Nicolas