Process for the preparation of inclusion pigments

US5753026A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Mathias Kuntz
• Hubert Linne · Otzberg, DE
• Joachim Weitzel · Darmstadt, DE
• Dieter Heinz · Heppenheim, DE
• Rodney Riddle · Holzminden, DE

Key dates

• Filing date: Oct 21, 1996
• Grant date: May 19, 1998
• Expiry date: Oct 21, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K9/10
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Reaction spray process for preparing inclusion pigments by suspending the pigment to be encapsulated in an aqueous solution or suspension of a precursor of the inclusion material, spraying the suspension, with or without the addition of nitric acid and fuel, in a tubular reactor heated at from 850.degree. to 1100.degree. C., separating the inclusion pigment from the product stream and, if desired post-calcining the pigment at a temperature of at least 816.degree. C.