Heptabromodibenzofuran, highly brominated dibenzofurans and the preparation and use thereof as flame retardants

US4111902A · kind A · utility

Assignee

• Dynamit Nobel GmbH · DE

Inventors

• Hermann Richtzenhain
• Klaus Schrage · Hennef (Sieg), DE

Key dates

• Filing date: Jul 29, 1976
• Grant date: Sep 5, 1978
• Expiry date: Jul 29, 1996

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/91
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Brominated dibenzofuran of the formula ##STR1## WHEREIN X + Y = 6.0 TO 7.0 AND Y = 0 TO 0.3. The brominated dibenzofuran can be prepared by reaction of bromine and dibenzofuran at 0.degree. and 150.degree. C in the presence of halogenation catalyst. The products are useful as flameproofing agents for organic polymers, e.g. polyethylene.