Patent · US Expired

Biaxially oriented sealable polypropylene film having improved barrier properties

US5433983A · kind A · utility

9Cited by

5References

53Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Detlef E. Schuhmann · Friedrichsthal, DE
Herbert Peiffer · Mainz, DE
Ursula Murschall · Nierstein, DE
Gunter Schloegl · Kelkheim, DE

Key dates

Filing date	Nov 18, 1993
Grant date	Jul 18, 1995
Priority date	—
Expiry date	Nov 18, 2013

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31913
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A sealable film is disclosed comprising (i) a base layer comprising polypropylene and a hydrocarbon resin and (ii) at least one top layer comprising (a) an ethylene/propylene copolymer having an ethylene content of not more than about 10% by weight, (b) a propylene/1-butene copolymer, (c) a propylene/ethylene/alpha-olefin terpolymer, or (d) a blend of two or more of (a), (b) and (c), wherein at least one of said base layer and said at least one top layer contains an anti-blocking agent or lubricant and wherein the top layer contains a hydrocarbon resin. The film possesses improved barrier properties with respect to permeability to water vapor and oxygen, and which at the same time exhibits favorable slip properties and low shrink values.

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