Isoindoline colorants

US4746740A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Lotsch · Beindersheim, DE
• Reinhard Kemper · Heidelberg, DE

Key dates

• Filing date: Jul 17, 1986
• Grant date: May 24, 1988
• Expiry date: Jul 17, 2006

Classification

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

Abstract

Isoindoline colorants of the formula ##STR1## where the radicals R independently of one another are each methyl or ethyl, give neutral yellow colorations when incorporated into surface coatings. The colorations do not darken on weathering and, compared with prior art pigments, exhibit improved gloss stability on weathering.