α-alumina flakes

US10457812B2 · 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: Apr 25, 2014
• Grant date: Oct 29, 2019
• Expiry date: Oct 31, 2034

Classification

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

Abstract

Alpha-Alumina flakes having a particle thickness of 550-1000 nm, a D50-value of 15-30 μm, a D90-value of 30-45 μm and a D10-value of ≤9.0 μm. Use of the alumina flakes in varnishes, paints, automotive coatings printing inks, masterbatches, plastics and cosmetic formulations. Also, use of the alumina flakes as a substrate for effect pigments and in organic dyes.