Microporous membranes of ultrahigh molecular weight polyethylene

Details Microporous membranes of ultrahigh molecular weight polyethylene Microporous membranes of ultrahigh molecular weight polyethylene

1988-05-09

1989-05-09

Sever, Frank

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

214 51, 2141761, 214DIG48, 214DIG62, B29C 4300, B29C 5512, C08J 928

Patent

active

048287725

ABSTRACT:
Microporous membranes and methods for producing such membranes from ultrahigh molecular weight polyethylene are described. The method employs extrusion of a solution of UHMW-PE and porogen through a forming die followed by thermal phase separation of polymer and porogen. Microporous structures are created by removing porogen. Microporous membranes produced include membranes with good permeability to air and water making them particularly useful as filtration media and water-resistance breathable membranes.

REFERENCES:
patent: 4057481 (1977-11-01), Lee et al.
patent: 4140815 (1979-02-01), Dege et al.

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