Patent · US Expired

Oriented polymeric microporous films

US5236963A · kind A · utility

92Cited by

4References

4Claims

0Family size

Assignee

Amoco Corporation · US

Inventors

Philip Jacoby · Naperville, US
William T. Tapp · Yorktown, US

Key dates

Filing date	Dec 30, 1992
Grant date	Aug 17, 1993
Priority date	—
Expiry date	Dec 30, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L51/06
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.