Effect pigments comprising a glass flake substrate

US9663661B2 · kind B2 · utility

Assignees

• ECKART GmbH · DE
• GLASSFLAKE LTD · GB

Inventors

• Günter Kaupp · Jessenitz Siedlung, DE
• Ulrich Schmidt · Flörsheim, DE
• Dirk Schumacher · Pegnitz, DE
• Katrin Steinbach · Koblenzer Straße, DE

Key dates

• Filing date: Apr 4, 2008
• Grant date: May 30, 2017
• Expiry date: Dec 16, 2031

Classification

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

Abstract

The present invention relates to an effect pigment comprising as a substrate a glass flake with a coating, said coating comprising at least one layer of at least one high refractive material, said material having a refractive index of at least 1.8, and/or at least one layer of at least one semitransparent metallic material, wherein said glass flakes comprising the following composition: 65-75 wt.-% silicon oxide, preferably SiO2 2-9 wt.-% aluminum oxide, preferably AI2O3 0.0-5 wt.-% calcium oxide, preferably CaO 5-12 wt.-% sodium oxide, preferably Na2O 8-15 wt.-% boron oxide, preferably B2O3 0.1-5 wt.-% titanium oxide, preferably TiO2 0.0-5 wt.-% zirconium oxide, preferably ZrO2 based on the weight of said glass flakes. The invention relates also to a method for producing the effect pigments as well as to the use of said effect pigments. The invention further relates to coating formulations based on the effect pigments.