Dispersible Berlin blue pigment

US4545821A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Axel Rau · Pfullendorf, DE
• Klaus-Dieter Franz · Kelkheim, DE

Key dates

• Filing date: Sep 21, 1984
• Grant date: Oct 8, 1985
• Expiry date: Sep 21, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A dispersible Berlin blue pigment comprises Berlin blue deposited on to mica platelets. The pigment is additionally coated with a first coat of basic aluminum sulfate and a second coat of a mixture of a metal hydroxide with a polysiloxane or a fatty acid.