Patent · US Expired

Coated pearlescent pigments with SiO2 and cerium oxide

US7413599B2 · kind B2 · utility

41Cited by

8References

23Claims

0Family size

Assignee

Eckart GmbH & Co. KG · DE

Inventors

Frank Henglein · Nuremberg, DE
Ulrich Schmidt · Flörsheim, DE
Peter Kruger · Lübeck, DE
Günter Kaupp · Jessenitz Siedlung, DE

Key dates

Filing date	Aug 26, 2005
Grant date	Aug 19, 2008
Priority date	—
Expiry date	Dec 24, 2025

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09C2200/408
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to pearlescent pigments with a platelet-shaped substrate comprising metal oxide and having a first and a second protective layer, said metal oxide having a refractive index of greater than 1.8, there being on the platelet-shaped substrate a first protective layer comprising cerium oxide and/or cerium hydroxide and a second protective layer of SiO2, applied to which is an organic chemical aftercoat comprising at least one silane having at least one functional bond group and at least one silane without a functional bond group, it being possible for metal oxide layers other than cerium oxide and SiO2 to be disposed between the first and the second protective layer. The invention further relates to a process for preparing these pigments, and to the use thereof.

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