Microporous film of polyethylene and process for the production

Details Microporous film of polyethylene and process for the production Microporous film of polyethylene and process for the production

1994-08-31

1996-04-02

Wu, David W.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421113, 264216, 2642884, 2642902, 526352, D01D 512

Patent

active

055037917

ABSTRACT:
Microporous film of polyethylene with a high degree of moisture vapour transmission rate and permeability to air and a process for the production of such a film 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 both sides of the film are 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), Burleigh
patent: 4620955 (1986-11-01), Kono et al.
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.
patent: 5051183 (1991-09-01), Takita et al.

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