Barrier films

US6503634B1 · kind B1 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Helmar Utz · Koppigen, CH
• Sabine Amberg-Schwab · Veitshöchheim, DE
• Gerhard Schottner · Heilsbronn, DE

Key dates

• Filing date: Feb 28, 1997
• Grant date: Jan 7, 2003
• Expiry date: Feb 28, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2004/86
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention concerns composites with excellent barrier properties to gases and water vapor. Such composites can be used, e.g., in foodstuff packaging or as technical membranes. The outstanding barrier effect is achieved by arranging on a substrate material, which, for example, may consist of biodegradable polymers, at least two films. At least one of these films consists of an organic-inorganic hybrid polymer (ORMOCER), at least one further film of a further barrier material or of a substrate material.