Process for production of separators for use in cells

Details Process for production of separators for use in cells Process for production of separators for use in cells

1981-10-05

1983-03-15

Newsome, John H.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

20415922, B05D 306

Patent

active

043767940

ABSTRACT:
A novel process for the production of a separator for use in a cell to prevent the short-circuiting of positive active material and negative active material comprises irradiating a polyolefin film 150 .mu.m or less thick with ionizing radiation at a dose rate of 5.times.10.sup.4 -10.sup.7 rads/sec. to give a total dose of 1 Mrad or more, contacting the irradiated film with an aqueous solution of a terminally unsaturated monomer such as acrylic acid, methacrylic acid and the like at a temperature of 10.degree. C.-60.degree. C. to thereby cause grafting of the monomer onto the polyolefin film before the grafted polymer film is treated with an aqueous alkaline solution to finally obtain the separator for use in a cell, which is substantially improved in that it shows low electrical resistance and is excellent both in its acid resistance and mechanical strength.

REFERENCES:
patent: 3088791 (1963-05-01), Cline et al.
patent: 3188165 (1965-06-01), Magat et al.
patent: 3322661 (1967-05-01), Yoshikawa et al.
patent: 3427206 (1969-02-01), Scardaville et al.
patent: 3955014 (1976-05-01), Mostev et al.

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