Method for producing microporous separator for electrochemical c

Details Method for producing microporous separator for electrochemical c Method for producing microporous separator for electrochemical c

1976-11-22

1978-07-04

Gwinnell, Harry J.

Coating processes

Foraminous product produced

Microporous coating

204296, B05D 310, B05D 500

Patent

active

040989305

ABSTRACT:
A method for producing a microporous separator for an electrochemical cell comprises dissolving a copolymer of acrylonitrile into N,N-dimethylformamide, impregnating an acid- and/or alkali-resistant fibrous web with the resultant solution, and thereafter dipping the impregnated web into an aqueous coagulating bath, whereby the copolymer deposits on and between the web fibers to form a microporous matrix. The aqueous coagulating bath is selected from the group consisting of water at a temperature of 15.degree. C or below and aqueous solutions of a water-soluble acid solute, basic solute, or netural solute at a concentration of one mol / 1 or above. This method yields products having low maximum pore radii and yet low electric resistances.

REFERENCES:
patent: 3100721 (1963-08-01), Holden
patent: 3450650 (1969-06-01), Murata
patent: 3492154 (1970-01-01), Einstman
patent: 3527653 (1970-09-01), Sommer et al.
patent: 3582393 (1971-06-01), Skikada
patent: 3795635 (1974-03-01), Marze et al.

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