Laser-markable plastics

US6376577B2 · kind B2 · utility

Assignee

• Merck Patentgesellschaft · 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: Dec 18, 2000
• Grant date: Apr 23, 2002
• Expiry date: Dec 18, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41M5/267
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to laser-markable plastics which comprise, as dopant, graphite particles having one or more coatings.