Multilayer interference pigment with absorbent central layer

US6132504A · kind A · utility

Assignee

• MERCK PATENT GESELLSCHAFT MIT BESHRANK TER HAFTUNG · DE

Inventors

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

Key dates

• Filing date: Oct 26, 1998
• Grant date: Oct 17, 2000
• Expiry date: Oct 26, 2018

Classification

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

Abstract

Multilayer interference pigment consisting of a central, absorbing layer and alternating layers of a material of low refractive index and of a metal or of a material of high refractive index either side of the central layer, the material of low refractive index preferably being acrylate and the metal being aluminium or chromium. The absorbing layer consists of a coating system which comprises carbon black or color-imparting absorption pigments.