Pearlescent pigment for water-borne surface-coating systems

USRE41858E1 · kind E1 · reissue

Assignee

• Merck Patent GmbH · DE

Inventors

• Joachim Duschek · Pfungstadt, DE
• Ralf Glausch · Darmstadt, DE

Key dates

• Filing date: Oct 7, 2009
• Grant date: Oct 26, 2010
• Expiry date: Oct 7, 2029

Classification

• Technology area (CPC —): General

Abstract

A pearlescent pigment based on a metal oxide-coated, platelet-shaped substrate and a top layer on the metal oxide layer, where the top layer comprises silicon dioxide, at least one further metal hydroxide or metal oxide hydrate and at least one organic coupling reagent. The further metal hydroxides or metal oxide hydrates are hydroxides or oxide hydrates of cerium, aluminum or zirconium, or mixtures thereof. The coupling reagents employed are organofunctional silanes, zirconium aluminates or metal acid esters.