Patent · US Expired

Pearlescent pigments

US8268069B2 · kind B2 · utility

1Cited by

6References

13Claims

0Family size

Assignee

Merck Patent GmbH · DE

Inventors

Sabine Melson · Mainz, DE
Marc Entenmann · Fellbach, DE
Marita Jekel · Darmstadt, DE
Marcus Mathias · Gernsheim, DE

Key dates

Filing date	Aug 10, 2005
Grant date	Sep 18, 2012
Priority date	—
Expiry date	Aug 10, 2025

Classification

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

Abstract

The present invention relates to pearlescent pigments based on glass flakes which are distinguished by the fact that they have the following layer structure: A) optionally a layer of SiO2, B) a high-refractive-index coating have a refractive-index n>1.8 which essentially consists of TiO2, C) a low-refractive-index layer comprising SiO2 and/or Al2O3 and optionally D) an outer protective layer, and to the use thereof in paints, coatings, automobile paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, paper, in toners for electrophotographic printing processes, in seed, in greenhouse sheeting and tarpaulins, as absorbers in the laser marking of paper and plastics, as absorbers for the laser welding of plastics, in cosmetic formulations, for the preparation of pigment pastes with water, organic and/or aqueous solvents, for the preparation of pigment compositions and dry preparations.

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