Preparation of pigments having improved technological properties

US4371735A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans Scherer · Mainbernheim, DE
• Wolfgang Lotsch · Beindersheim, DE
• Gustav Bock

Key dates

• Filing date: Jun 6, 1980
• Grant date: Feb 1, 1983
• Expiry date: Jun 6, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B57/04
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of an easily dispersible pigment, of high tinctorial strength, having the formula ##STR1## where A is cyano, carbonamido, N-phenyl or N-(chlorophenyl)-carbonamido or is a 5-membered or 6-membered unsaturated heterocyclic ring fused to a benzene ring and B is a barbituric acid radical, by condensing 1-amino-3-imino-insoindoline with the appropriate cyanomethylene compound at pH>7 and then with barbituric acid at pH 1.5-3.5, in an aqueous medium or in water, at from 20.degree. to 150 C. The process may be used to produce high-hiding or transparent pigments which give brilliant colorations.