Patent · US Expired

Silver pigments

US7344590B2 · kind B2 · utility

8Cited by

3References

10Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Christoph Schmidt · Kriftel, DE
Tanja Delp · Darmstadt, DE
Johann Dietz · Dietzenbach, DE

Key dates

Filing date	Mar 29, 2004
Grant date	Mar 18, 2008
Priority date	—
Expiry date	Mar 29, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The present invention relates to silver pigments based on transparent, low-refractive-index, platelet-shaped substrates which have a high-refractive-index coating consisting of TiO2 having a layer thickness of 5-300 nm and optionally an outer protective layer, and to the use thereof in paints, coatings, printing inks, security printing inks, plastics, button pastes, ceramic materials, glasses, for seed coloring, as dopants in the laser marking of plastics and papers, as additives for coloring in the foods and pharmaceuticals sectors, and in cosmetic formulations and for the preparation of pigment compositions and dry preparations.

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