Microporous membranes from polypropylene

Details Microporous membranes from polypropylene Microporous membranes from polypropylene

1987-04-24

1989-10-17

Spear, Frank

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

210490, 21050036, 2642888, B29D 2704

Patent

active

048745677

ABSTRACT:
Microporous polypropylene membrane or hollow fibers is formed from a melt blend of 5 to 20 weight percent polypropylene and a solvent. The melt blend is shaped and cooled to effect solid phase separation of the polypropylene from the blend. The solvent is separated from the polypropylene by extraction and the porous polypropylene is dried under restraint to prevent shrinkage.

REFERENCES:
patent: 3713875 (1973-01-01), Beyer et al.
patent: 4214020 (1980-07-01), Ward et al.
patent: 4406673 (1983-09-01), Yamada et al.
patent: 4519909 (1985-05-01), Castro
patent: 4539256 (1985-09-01), Shipman
patent: 4726989 (1988-02-01), Mrozinski

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