Tough, dimensionally-stable transparent film having a copolyamide layer containing solid nanoscale filling materials with nucleating effect and its use for packaging foodstuffs

US6627324B1 · kind B1 · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Holger Eggers · Eindhoven, NL
• Gregor Kaschel · Bad Fallingbostel, DE
• Claudia Muller · Trebsen/Mulde, DE
• Andreas Gasse · Walsrode, DE
• Rainer Brandt · Walsrode, DE
• Dieter Neubauer · Bad Fallingbostel, DE
• Bernd Eilers · Hamburg, DE

Key dates

• Filing date: Apr 10, 2001
• Grant date: Sep 30, 2003
• Expiry date: Apr 10, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31746
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Described is a film having at least a single layer and at least one copolyamide layer (I) containing dispersed nanoscale nucleating particles. Crystalline structures extending from the dispersed particle surfaces are formed after the layer (I) is cooled from a molten state at a cooling rate of from 10° C. to 20° C. per minute. The dispersed nanoscale nucleating particles are present in layer (I) in an amount of from 10 ppm to 2000 ppm, based on the total weight of layer (I). Also described is a method of using the film of the present invention in packaging foodstuffs.