	US 11,891,541 B2
	Alpha-alumina flakes
Ryuta Suzuki, Iwaki (JP); Gerhard Pfaff, Muenster (DE); Sabine Schoen, Herten (DE); Noriyuki Matsuda, Chiba (JP); and Katsuhisa Nitta, Iwaki (JP)
Assigned to MERCK PATENT GMBH, Darmstadt (DE)
Filed by Merck Patent GmbH, Darmstadt (DE)
Filed on Apr. 14, 2022, as Appl. No. 17/720,607.
Application 17/720,607 is a division of application No. 16/843,395, filed on Apr. 8, 2020, abandoned.
Application 16/843,395 is a division of application No. 14/264,431, filed on Apr. 29, 2014, granted, now 10,647,861.
Claims priority of application No. 13002293 (EP), filed on Apr. 30, 2013.
Prior Publication US 2022/0243076 A1, Aug. 4, 2022
Int. Cl. C09D 7/62 (2018.01); C09D 7/40 (2018.01); C01F 7/02 (2022.01); C01F 7/34 (2006.01); C01F 7/441 (2022.01); C09C 1/00 (2006.01); C08K 3/22 (2006.01)

CPC C09D 7/62 (2018.01) [C01F 7/02 (2013.01); C01F 7/34 (2013.01); C01F 7/441 (2013.01); C09C 1/0015 (2013.01); C09C 1/0021 (2013.01); C09C 1/0024 (2013.01); C09D 7/70 (2018.01); C01P 2002/52 (2013.01); C01P 2002/84 (2013.01); C01P 2004/20 (2013.01); C01P 2004/24 (2013.01); C01P 2004/51 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C08K 3/22 (2013.01); Y10T 428/2982 (2015.01)]

21 Claims

1. An automobile coating, automotive finishing or industrial coating,

comprising

(1) coated and/or uncoated Al₂O₃flakes having a particle thickness of 130-400 nm, D₅₀-value of 15-30 μm, D₉₀-value of 30-45 μm and a D₁₀-value of <9.5 λm, wherein the coated A₂O₃flakes have one or more coatings on top of and completely encapsulating said Al₂O₃flakes and forming one or more layers apart from the Al₂O₃flakes, wherein said Al₂O₃flakes are alpha-alumina flakes,

and

(2) one or more further ingredients apart from said coated and/or uncoated Al₂O₃flakes suitable for an automobile coating, automotive finishing or industrial coating.