Increase in molecular weight of polycondensates

US5807966A · kind A · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• Rudolf Pfaendner · Rimbach, DE
• Heinz Herbst · Herbstein, DE
• Kurt Hoffmann · Taufkirchen, DE

Key dates

• Filing date: Dec 19, 1996
• Grant date: Sep 15, 1998
• Expiry date: Dec 19, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/5393
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An increase in the molecular weight of virgin polycondensates and polycondensate recyclates can be achieved by heating to above the melting point or glass transition temperature and by the addition of diphosphonite.