Transparent high strength polyamide film

US6780522B1 · kind B1 · utility

Assignee

• Wolff Walsrode AG · DE

Inventors

• Holger Eggers · Eindhoven, NL
• Andreas Gasse · Walsrode, DE
• Gregor Kaschel · Bad Fallingbostel, DE
• Rainer Brandt · Walsrode, DE
• Bernd Eilers · Hamburg, DE

Key dates

• Filing date: Apr 10, 2001
• Grant date: Aug 24, 2004
• 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 single or multi-layered film having at least one polyamide layer (I) containing dispersed nanoscale nucleating particles. The smallest components of the dispersed nanoscale nucleating particles in layer (I) have an extension of less than 100 nm in at least one randomly selected direction for each component, based on a weighted average of all components of the dispersed nanoscale nucleating particles. Crystalline structures emanating from the surface of the dispersed nanoscale nucleating particles are formed after the layer (I) is cooled from the molten state at a rate of from 10 to 20° C. per minute. The dispersed nanoscale nucleating particles are present in the polyamide layer (I) in an amount of from 10 ppm to 3000 ppm, based on the total weight of layer (I).