Phenolic Or Thermosetting Resin Patents (Class 429/253)
  • Bipolar separator for electrochemical cells and method of preparation thereof
    Patent number: 4197178
    Abstract: An improved bipolar separator for electrochemical cells comprising a molded aggregate of an electrically conductive powdered material and a powdered thermosetting resin in a weight ratio of 1:1 to 9:1 and having a resistivity coefficient, in the direction perpendicular to the major surfaces of the separator, of less than 0.3.OMEGA. cm and having the entire surface exposed to the anolyte, except the area of electrical contact with the anode, coated with a layer of a chemically resistant and electrically non-conductive thermosetting resin and electrochemical cells containing the said bipolar separator and method of producing the said bipolar separator.
    Type: Grant
    Filed: January 30, 1978
    Date of Patent: April 8, 1980
    Assignee: Oronzio deNora Impianti Elettrochimici S.p.A.
    Inventors: Alberto Pellegri, Placido M. Spaziante
  • Battery containing an alkaline electrolyte
    Patent number: 4157423
    Abstract: A battery containing an alkaline electrolyte, having within a container, said electrolyte and two electrodes separated by a separator; said separator being made of a partially reticulated polyvinyl acetal produced by the action of at least one aldehyde on polyvinyl alcohol; preferably an aromatic aldehyde, which may also have at least one hydroxyl radical, being used together with formaldehyde.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: June 5, 1979
    Assignee: Compagnie Generale d'Electricite
    Inventor: Robert Gadessaud
  • In situ self cross-linking of polyvinyl alcohol battery separators
    Patent number: 4154912
    Abstract: A battery separator is produced from a polyvinyl alcohol sheet structure which is subjected to an in situ, self cross-linking process by selective oxidation of the 1,2 diol units present in the polyvinyl alcohol sheet structure. The 1,2 diol units are cleaved to form aldehyde end groups which subsequently cross-link through acetalization of the 1,3 diol units of the polyvinyl alcohol. Selective oxidation is achieved using a solution of a suitable oxidizing agent such as periodic acid or lead tetraacetate.
    Type: Grant
    Filed: April 19, 1978
    Date of Patent: May 15, 1979
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Warren H. Philipp, Li-Chen Hsu, Dean W. Sheibley
  • Battery containing an alkaline electrolyte
    Patent number: 4086405
    Abstract: A battery containing an alkaline electrolyte, having within a container, said electrolyte and two electrodes separated by a separator; said separator being made of a partially reticulated polyvinyl acetal produced by the action of at least one aldehyde on polyvinyl alcohol; preferably an aromatic aldehyde, which may also have at least one hydroxyl radical, being used together with formaldehyde.
    Type: Grant
    Filed: December 18, 1972
    Date of Patent: April 25, 1978
    Assignee: Compagnie Generale d'Electricite S.A.
    Inventor: Robert Gadessaud
  • Phenolic resin and battery separator impregnated therewith
    Patent number: 4075403
    Abstract: The invention relates to an improved phenol-aldehyde resole resin composition for battery separators and a fibrous battery separator impregnated with the composition. Said composition comprising a resole resin with particular soluble hydroxy organic salts that do not salt out and improve the oxidation resistance of the battery separators.
    Type: Grant
    Filed: January 21, 1977
    Date of Patent: February 21, 1978
    Assignee: Monsanto Company
    Inventors: William D. Burke, Harold P. Higginbottom, John R. Le Blanc