Preparation of diketopyrrolopyrrole pigments

US6723138B2 · kind B2 · utility

Assignee

• CLARIANT INTERNATIONAL LTD · CH

Inventors

• Uwe Nickel · Bad Homburg vor der Höhe, DE
• Leonhard Unverdorben · Uttenreuth, DE
• Joachim Weber · Frankfurt am Main, DE
• Erwin Dietz · Kelkheim, DE
• Juergen Patzlaff · Roßdorf, DE

Key dates

• Filing date: Mar 6, 2003
• Grant date: Apr 20, 2004
• Expiry date: Mar 6, 2023

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24562
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing diketopyrrolopyrrole pigments comprises conducting the elementary steps of pigment synthesis (reaction and hydrolysis) in a miniaturized continuous reactor.