Merck Patent Gmbh

Hans-Juergen Brehm

Gerhard Pfaff

Matthias Kuntz

Helge Bettina Kniess

Reiner Delp

Ulrich Quittmann

Volker Wilhelm

The present invention relates to microspheres and to the use thereof, preferably as laser-absorbing additive, and to a process for the production thereof.

Microspheres

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.

Laser-markable pigments containing an absorber coated with a marker

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Lindenfels, Germany

Hans-Juergen Brehm