Sealable white film made of polyolefins

US5277970A · kind A · utility

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: Jun 5, 1992
• Grant date: Jan 11, 1994
• Expiry date: Jun 5, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2826
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A multilayered, white, biaxially-oriented polypropylene film is disclosed. The film has an at least three-layered build-up and has a base layer comprised of propylene polymers comprising up to 2% by weight of calcium carbonate having an average particle size of not more than 2.0 .mu.m and 0 to 25% be weight of titanium dioxide, an intermediate layer comprised of propylene polymers comprising 0 to 25% by weight of titanium dioxide, relative to the total weight of the intermediate layer; and a top layer comprised of a sealable raw material. The base layer and/or the intermediate layer of the film contain a total of at least 2% by weight of titanium dioxide.