Oriented polymeric microporous films

Details Oriented polymeric microporous films Oriented polymeric microporous films

1992-12-30

1993-08-17

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521134, 524427, 524505, 524515, 525 88, 525240, C08J 900

Patent

active

052369633

ABSTRACT:
This invention relates to polymeric compositions capable of being converted into oriented microporous films having microvoid cells, interconnecting pores between the cells, and improved elongation, softness and tear strength, comprising an ethylene-propylene block copolymer having an ethylene content of about 10 to about 50 wt %, a low flexural modulus propylene-based polymer, a propylene homopolymer or copolymer having up to about 10 wt % of a comonomer of ethylene or an .alpha.-olefin of 4 to 8 carbon atoms, an inorganic filler such as calcium carbonate, a beta-spherulite nucleating agent, and optionally, a low molecular weight polypropylene and to microporous films formed from such compositions.

REFERENCES:
patent: 5045589 (1991-09-01), Ueno
patent: 5147933 (1992-09-01), Koizumi
patent: 5176953 (1993-01-01), Jacoby
patent: 5180629 (1993-01-01), Terada et al.

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