Laser-markable plastics

US6291551A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Helge Kniess · Roßdorf, DE
• Dieter Heinz · Heppenheim, DE
• Reiner Delp · Darmstadt, DE
• Gerhard Pfaff · Mainburg, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE

Key dates

• Filing date: Sep 13, 2000
• Grant date: Sep 18, 2001
• Expiry date: Sep 13, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/146
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to laser-markable plastics of which a feature is that they comprise as dopant anthracene- or pentaerythritol-coated effect pigments or a mixture comprising one or more effect pigments and anthracene and/or pentaerythritol.