Laser-markable pigments containing an absorber coated with a marker

US7202288B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Helge Kniess · Roßdorf, DE
• Gerhard Pfaff · Mainburg, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE
• Hans-Juergen Brehm · Lindenfels, DE
• Reiner Delp · Darmstadt, DE

Key dates

• Filing date: Nov 5, 2003
• Grant date: Apr 10, 2007
• Expiry date: Dec 11, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Laser-markable pigments which are distinguished by the fact that an absorber is coated with a marker and optionally with a diffusion barrier are described. Further, processes for the preparation of the laser-markable pigments and methods for using them are described. The absorber is preferably an inorganic pigment or a filler. The marker is preferably an intrinsically laser-markable polymer, particularly a polyethylene terephthalate, acrylonitrile-butadiene-styrene, polystyrene, polyphenylene ether, liquid-crystal polymer or polyphenylene sulfide.