Paper-like white-opaque heat-sealable polypropylene film

US5466520A · kind A · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Anton Krallmann · Bad Fallingbostel, DE
• Ulrich Reiners · Neuenkirchen, DE
• Eberhard Albinus · Bad Fallingbostel, DE
• Jürgen Bohner · Bad Waldsee, DE
• Neele Neelen · Einbeck, DE

Key dates

• Filing date: Apr 28, 1994
• Grant date: Nov 14, 1995
• Expiry date: Apr 28, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a white-opaque biaxially orientated multilayer film with good heat-sealing properties and with a paper-like appearance on at least one side, comprising an opaque core and at least one outer layer made of: PA1 10-15% by weight of an isotactic polypropylene having a density of 0.9-0.91 g/cm.sup.3 and a melt-flow index of 0.5 g/10 min to 8 g/10 min at 230.degree. C. under 21.2 N load (determined to DIN 53735), PA1 5-15% by weight of a low-density linear copolymer of ethylene, modified with rubber and with maleic acid anhydrite, PA1 40-80% by weight of a statistical propylene/ethylene copolymer with 2 to 6% by weight of ethylene or statistical terpolymers of propylene, ethylene and butylene with a comonomer content of <15% by weight and a butylene content of <7% by weight and PA1 5-15% by weight of an inorganic filler, preferably rutile-type titanium dioxide with an average diameter of 200 nm.