Sealable, opaque, biaxially orientated multilayer polypropylene film, process for its production and its use

US5326625A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Detlef E. Schuhmann · Friedrichsthal, DE
• Herbert Peiffer · Mainz, DE
• Gunter Schloegl · Kelkheim, DE

Key dates

• Filing date: May 26, 1992
• Grant date: Jul 5, 1994
• Expiry date: May 26, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31938
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A sealable, opaque, biaxially orientated multilayer polpropylene film comprising a core layer and (an) intermediate layer(s) located on one or both sides of the core layer and (a) top layer(s) located on one or both sides of the intermediate layer(s) or the core layer, wherein the core layer contains a polypropylene polymer or a polypropylene mixture and calcium carbonate having an average particle diameter of 1 to 2 .mu.m; the intermediate layer(s) comprise(s) a polypropylene polymer or a polypropylene mixture; at least one top layer has a thickness of .ltoreq.0.4 .mu.m; and the top layer(s) comprise(s) a copolymer of ethylene and propylene or ethylene and butylene or propylene and butylene or ethylene and another .alpha.-olefin having 5 to 10 carbon atoms or propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a terpolymer of ethylene and propylene and butylene or ethylene and propylene and another .alpha.-olefin having 5 to 10 carbon atoms or a mixture of one or more of the co- and/or terpolymers mentioned with polypropylene or a mixture of two or more of the co- and/or terpolymers mentioned, has a combination of properties rendering it suitable as a packaging or …