Tetra-(hydroxyaryl)-bis-quinoxalines and preparation thereof

US4739058A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Volker Eckhardt · Walsrode, DE
• Hans-Rudolf Dicke · Bestwig, DE
• Dieter Freitag · Krefeld, DE

Key dates

• Filing date: Jun 19, 1986
• Grant date: Apr 19, 1988
• Expiry date: Jun 19, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to bis-quinoxalines of the formula I ##STR1## their preparation, their use as branching agents for the preparation of branched, thermoplastic polycarbonates and the branched thermoplastic polycarbonates.