Alpha-alumina flakes

US11180659B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Ryuta Suzuki · Anjo, JP
• Gerhard Pfaff · Mainburg, DE
• Sabine Schoen · Darmstadt, DE
• Fumiko Sasaki · Iwaki, JP
• Satoru Kobayashi · Fukushima, JP
• Koshiro Kunii · Iwaki, JP
• Yuji Takenaka · Iwaki, JP
• Katsuhisa Nitta · Iwaki, JP

Key dates

• Filing date: Jul 2, 2019
• Grant date: Nov 23, 2021
• Expiry date: Jul 2, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2982
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A blended composition containing uncoated Al2O3 flakes having a thickness of ≥500 nm and a D50-value of 15-30 μm and a D90-value of 30-45 μm, and/or coated Al2O3 flakes having a thickness of ≥500 nm and a D50-value of 15-30 μm and a D90-value of 30-45 μm, which have been coated with at least one layer of a metal oxide, mixtures of at least two metal oxides, metal, metal sulphide, titanium suboxide, titanium oxynitride, FeO(OH), metal alloys and/or rare earth compounds, and their use in various formulations.