Process for preparing pigments

US7682444B2 · kind B2 · utility

Assignee

• LANXESS Deutschland GmbH · DE

Inventors

• Ulrich Feldhues · Bensberg, DE
• Frank Linke · Recklinghausen, DE
• Ronald Gobel · Leverkusen, DE

Key dates

• Filing date: Jul 3, 2007
• Grant date: Mar 23, 2010
• Expiry date: Jun 15, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D11/322
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Process for preparing pigments of the formula (I)or tautomeric structures thereof and their hydrates, containing melamine as guest, characterized in that a mixture of the azobarbituric mono-cation salt (II) and the azobarbituric di-cation salt (III) is reacted with a nickel compound and melamine,in which cation1, cation2 and cation3 independently of one another are any desired univalent cations or the fraction of any desired multivalent cation that corresponds to a positive charge of one.