6-aryl-6H-dibenzo[c,e][1,2]oxaphosphorine stabilizers for plastics

US5356967A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Manfred Bohshar · Kelkheim, DE
• Hans-Jerg Kleiner · Kronberg, DE
• Gerhard Pfahler · Augsburg, DE

Key dates

• Filing date: Dec 23, 1992
• Grant date: Oct 18, 1994
• Expiry date: Dec 23, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/5377
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A dibenzo-[c,e] [1,2] oxaphosphorine of the formula I and process of making said compound ##STR1## wherein n=1 or 2 and in which R.sup.1 is a monovalent or divalent aromatic radical wherein a Grignard compound R.sup.1 (MgHal).sub.n is reacted with 6-chloro-6H-dibenzo[c,e][1,2] oxaphosphorine. This compound optionally with phenolic antioxidants, provides stabilization in polymers.