Weather-resistant pearlescent pigments, process for the production and use thereof

US9051471B2 · kind B2 · utility

Assignee

• ECKART GmbH · DE

Inventors

• Michael Grüner · Zwingenberg, DE
• Thomas Schneider · Frederick, US
• Günter Kaupp · Jessenitz Siedlung, DE

Key dates

• Filing date: Mar 28, 2012
• Grant date: Jun 9, 2015
• Expiry date: May 10, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2220/106
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The present invention relates to a weather-resistant pearlescent pigment which consists of a platelet-shaped substrate coated with one or more highly refractive metal oxides, the platelet-shaped substrate being selected from the group consisting of synthetic mica flakes, glass flakes, SiO2 flakes, Al2O3 flakes, synthetic boehmite flakes, BiOCl flakes and mixtures thereof, and a top layer, wherein the top layer consists of the following layers: a) a cerium-containing layer, selected from the group consisting of cerium oxide, cerium hydroxide, hydrated cerium oxide, and mixtures thereof, the cerium-containing layer being applied directly to the highly refractive metal oxide layer, and b) an organic-chemical compatibilizing layer, which comprises the reaction products of oligomeric silanes, wherein the oligomeric silanes have one or more amino groups, the organic-chemical compatibilizing layer being applied directly to the cerium-containing layer a).