Microporous film, battery separator employing the same, and meth

Details Microporous film, battery separator employing the same, and meth Microporous film, battery separator employing the same, and meth

1989-09-08

1991-02-19

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

161159, 2642104, H01M 216

Patent

active

049943359

ABSTRACT:
This microporous film has an approximately uniform configuration in which the intervals between slender fibrils extend approximately two-dimensionally which are connected to each other between adjacent unstretched planar flat portions to define fine through-pores, and the distribution of pore size is sharp and the porosity is high. Accordingly, the microporous film excels in water filtration rate and selective separating capability and is suitable for use as filter membrane, separator membrane, gas exchange membrane, and a battery separator.

REFERENCES:
patent: 3426754 (1969-02-01), Bierenbaum et al.
patent: 3558764 (1971-01-01), Isaacson et al.
patent: 3679538 (1972-07-01), Druin et al.
patent: 3801404 (1974-04-01), Druin et al.
patent: 3801692 (1974-04-01), Zimmerman
patent: 3843761 (1974-10-01), Bierenbaum et al.
patent: 4138459 (1979-02-01), Brazinsky et al.
patent: 4735875 (1988-04-01), Anderman et al.
patent: 4791144 (1988-12-01), Nagou et al.

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