Microporous film and process for the production thereof

Details Microporous film and process for the production thereof Microporous film and process for the production thereof

1993-07-12

1994-12-06

Schofer, Joseph L.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428521, 5263481, 526352, B32B 2732

Patent

active

053708890

ABSTRACT:
Microporous film of ultra high molecular weight polyethylene with a high degree of moisture vapor transmission rate and a permeability to air that lies within a narrow range and a process for the production of a film with a high degree of moisture vapor transmission rate and a permeability to air that lies within a narrow range from a polyolefine by extruding a solution of the polyolefine in a first solvent, followed by cooling, the removal of the solvent and stretching of the film, in which the surface of one and only one side of the film is brought into close contact with a second solvent for the polyolefine before the film is contacted with the cooling agent.

REFERENCES:
patent: 4613544 (1986-09-01), Barleigh
patent: 4829096 (1989-05-01), Kitamura et al.
patent: 4833172 (1989-05-01), Schwarz et al.
patent: 4873034 (1989-10-01), Kono et al.
patent: 4948544 (1990-08-01), Van Unen et al.
patent: 4987025 (1991-01-01), Shiraki et al.

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