Hans Rudolf Merstetter

20050176959, Aug 11, 2005

Jul 8, 2003

10/517412

Fridolin Babler - Teresopolis RJ, BR
Hans Merstetter - Chadds Ford PA, US

C07D471/02

546049000

The present invention relates to a process of preparing quinacridone by oxidizing a 6,13-dihydroquinacridone salt corresponding to the quinacridone pigment with hydrogen peroxide as the oxidizing agent in the presence of 2,7-anthraquinone disulfonic acid as catalyst. The inventive process is economical and environmentally friendly and yields high performance quinacridone pigments in a high yield.

20150033987, Feb 5, 2015

Feb 27, 2013

14/379336

- Ludwigshafen, DE
Aron Wosylus - Bad Duerkheim, DE
Christof Kujat - Neustadt, DE
Hans Rudolf Merstetter - Chadds Ford PA, US
Casper Mullertz - Middletown, DE

BASF SE - Ludwigshafen

C08K 3/08
B22F 1/02
B22F 9/00
B22F 1/00
B22F 9/04

106404, 75356

Described are thin plane-parallel aluminum flakes illustrated in FIG. having a thickness of up to 200 nm and comprising an inner layer of oxidized aluminium having a thickness of 0.5-30 nm, a process for the manufacture thereof and the use thereof, e.g. in formulations, like paints, electrostatic coatings, printing inks, plastics materials, and cosmetics. Surprisingly, due to the inner layer of oxidized aluminum the aluminum flakes have an improved shear stability as evidenced e.g. by the difference in lightness before and after shear stress.