Polypropylene microporous film

Details Polypropylene microporous film Polypropylene microporous film

1991-10-31

1992-07-28

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

2642884, 2642902, 521918, B29C 5500, B29C 4908

Patent

active

051341743

ABSTRACT:
Polypropylene microporous films characterized by having a porosity of 30-35%, an average pore size of 200-800 Angstroms, a permeation coefficient for nitrogen of 1-5.times.10.sup.-3 ml/cm sec atm and a tensile strength of greater than 60 MPA in all directions within the film plane are prepared by the consecutive steps of biaxial stretching a non-porous starting film of high .beta.-crystal content and heat setting the stretched film.

REFERENCES:
patent: 4100238 (1978-07-01), Shimomura
patent: 4386129 (1983-05-01), Jacoby
patent: 4975469 (1990-12-01), Jacoby

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