Multilayer interference pigment with transparent central layer

US6156115A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Gerhard Pfaff · Mainburg, DE
• Gerd Bauer · Kleinostheim, DE
• Martin Friz · Darmstadt, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE
• Christina Schank · Mühltal, DE

Key dates

• Filing date: Oct 26, 1998
• Grant date: Dec 5, 2000
• Expiry date: Oct 26, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09C2220/20
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Multilayer interference pigment consisting of a central layer of a transparent or semitransparent material of low refractive index and alternating layers of a metal or of a material of high refractive index and of a material of low refractive index either side of the central layer, the material of low refractive index preferably being magnesium fluoride or acrylate and the metal preferably being aluminium or chromium.