Patent · US Active

Effect pigments based on artificially produced substrates with a narrow size distribution

US11299636B2 · kind B2 · utility

0Cited by

14References

14Claims

0Family size

Assignee

ECKART GmbH · DE

Inventors

Günter Kaupp · Jessenitz Siedlung, DE
Ulrich Schmidt · Flörsheim, DE
Dirk Schumacher · Pegnitz, DE
Ralph Schneider · Achern, DE

Key dates

Filing date	Nov 25, 2008
Grant date	Apr 12, 2022
Priority date	—
Expiry date	Feb 27, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09C2220/106
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention relates to effect pigments comprising artificial platelet-shaped substrates which have at least one optically active coating, where the effect pigments have a volume-averaged cumulative undersize distribution curve with the characteristic numbers D10, D50 and D90, said cumulative undersize distribution curve having a span ΔD of 0.7-1.4, and the span ΔD being calculated in accordance with formula (I): ΔD=(D90−D10)/D50 (I), and the average thickness of the artificial platelet-shaped substrates being 500 nm to 2000 nm.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.