Process for formation of halogenated polymeric microporous membr

Details Process for formation of halogenated polymeric microporous membr Process for formation of halogenated polymeric microporous membr

1989-11-15

1991-03-05

Lorin, Hubert C.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By treating occluded solids

264 41, 264175, 264234, 264344, 264345, B29C 6720

Patent

active

049976036

ABSTRACT:
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.

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