Patent · US Expired

Pigment for safety applications

US7077897B2 · kind B2 · utility

10Cited by

3References

18Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Hans-Dieter Brueckner · Darmstadt, DE
Matthias Kuntz · Seeheim-Jugenheim, DE

Key dates

Filing date	Sep 18, 2001
Grant date	Jul 18, 2006
Priority date	—
Expiry date	Sep 18, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09C2220/106
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to a multilayered interference pigment consisting of a transparent carrier material which is coated with alternating layers of colorless, non-absorbent metal oxides having a high and a low refractive index, the difference between the refractive indices being at least 0.1. The inventive pigment can be obtained by alternately coating the transparent carrier material with a metal oxide having a high refractive index and a metal oxide having a low refractive index according to the wet method, by hydrolysing the corresponding water-soluble, inorganic metal compounds, and separating, drying and optionally calcinating the obtained pigment.

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