Chromogenic enamine compounds, their preparation and use as color formers

US5130442A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Karlheinrich Meisel · Odenthal, DE
• Hubertus Psaar · Leverkusen, DE

Key dates

• Filing date: Oct 31, 1990
• Grant date: Jul 14, 1992
• Expiry date: Oct 31, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D491/10
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula ##STR1## in which R.sup.1 /R.sup.2 are alkyl, cycloalkyl, aralkyl or alkylene, PA1 R.sup.3 is alkyl, cycloalkyl or aralkyl, PA1 Z is alkylene, PA1 X is O or are highly suitable as color formers in recording materials based on acid developers. They give yellow or orange hues which have excellent sublimation and light fastness.