Modified diarylide pigments and their preparation

US4602960A · kind A · utility

Assignee

• BASF Farben Fasern Aktiengesellschaft · DE

Inventors

• Egon Liedek · Eßlingen, DE
• Wolfgang Ruff · Stuttgart, DE
• Gerhard Berger · Stuttgart, DE
• Hans W. Sonneborn · Schwäbisch Gmünd, DE
• Reinhard Kemper · Heidelberg, DE

Key dates

• Filing date: Aug 16, 1984
• Grant date: Jul 29, 1986
• Expiry date: Aug 16, 2004

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B67/0046
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A novel modified diarylide pigment contains (a) a pigment which is composed of a tetrazotized benzidine, coupled to an acetoacetarylide and/or a 1-phenyl-3-methylpyrazole-5-one, and (b) a water-soluble component obtained from a symmetric or asymmetric coupling product of a tetrazotized 4,4'-diamino-2,2'-stilbenedisulfonic acid and an acetoacetarylide and/or a 1-phenyl-3-methyl-5-pyrazolone. The novel pigments possess very good color strength, very good gloss characteristics and very good transparency, and exhibit improved printing characteristics, particularly in offset printing inks.