Branched polyphosphonates

US7816486B2 · kind B2 · utility

Assignee

• FRX Polymers, Inc. · US

Inventors

• Dieter Freitag · Krefeld, DE
• Michael Vinciguerra · Hampton, US
• Norman Rice · Munroe Falls, US
• Richard W. Lusignea · Watertown, US

Key dates

• Filing date: Feb 24, 2004
• Grant date: Oct 19, 2010
• Expiry date: Apr 13, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L85/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed are branched polyphosphonates produced using a polycondensation process, that result in polyphosphonates having a Tg of at least 100° C., and which can be further processed to have improved hydrolytic stability compared to other polyphosphonates. The method and polyphosphonate compositions may be made from readily available starting materials providing lower cost fire retardant materials. Also disclosed are polymer compositions that comprise these branched polyphosphonates and at least one other polymer, wherein the resulting polymer compositions exhibit flame retardant properties.