US 12,129,386 B2
Production of pigments having a defined size and shape
Maik Rudolf Johann Scherer, Grainau (DE); and Kai Herrmann Scherer, Munich (DE)
Assigned to GIESECKE+DEVRIENT CURRENCY TECHNOLOGY GMBH, Munich (DE)
Filed by Giesecke+Devrient Currency Technology GmbH, Munich (DE)
Filed on Oct. 19, 2021, as Appl. No. 17/504,925.
Claims priority of application No. 10 2020 006 456.6 (DE), filed on Oct. 20, 2020.
Prior Publication US 2022/0119655 A1, Apr. 21, 2022
Int. Cl. C09D 11/037 (2014.01); C09B 67/20 (2006.01); C09C 3/00 (2006.01)
CPC C09D 11/037 (2013.01) [C09B 67/006 (2013.01); C09C 3/00 (2013.01); C01P 2004/30 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A process for producing pigments having a defined size and shape, comprising the steps:
a) production of a three-dimensional surface structure on a substrate, with surface regions which are in each case partly bounded by a plurality of three-dimensional structural elements and are arranged in gaps being formed;
b) application of a pigment material layer to the surface structure;
c) detachment of the pigment material layer from the surface structure and production of pigments;
wherein in step a) adjacent surface regions are connected to one another.