Pearlescent pigment for water-borne surface-coating systems

US5472491A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

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

Key dates

• Filing date: Jun 24, 1994
• Grant date: Dec 5, 1995
• Expiry date: Jun 24, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2220/10
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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.