Formation of halogenated polymeric microporous membranes having

Details Formation of halogenated polymeric microporous membranes having Formation of halogenated polymeric microporous membranes having

1988-08-05

1990-03-20

Walton, Donald L.

Chemistry: electrical current producing apparatus, product, and

Current producing cell, elements, subcombinations and...

Separator, retainer, spacer or materials for use therewith

264 49, H01M 216

Patent

active

049101064

ABSTRACT:
Disclosed herein is a process for producing a polyhalogenated microporous film having a very narrow pore size distribution and good temperature and chemical resistance. The process involves blending a polyhalogenated copolymer having a very small particle size with a binder polymer utilizing a solvent which is a nonsolvent for the polyhalogenated copolymer but a solvent for the binder polymer, forming a film from the blend, drying the film, heating the film to a temperature at or above the melting point of the polyhalogenated copolymer and under conditions such that the microparticulate particles at their points of mutual contact will neck together to form a relatively continuous matrix and extracting the binder polymer from the film utilizing a solvent for the binder particle to form a microporous film.

REFERENCES:
patent: 2806256 (1957-09-01), Smith-Johannsen
patent: 3123654 (1964-03-01), Malischewski
patent: 3354247 (1967-11-01), Zehender et al.
patent: 3407249 (1968-10-01), Landi
patent: 3929950 (1975-12-01), Nakamura
patent: 3973398 (1961-02-01), Hubbard et al.
patent: 4629666 (1986-12-01), Schlaikjer

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