Process for the preparation of high molecular weight polycondensates

US5854372A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Andree Henze · Hofheim, DE
• Karsten Blatter · Lechenich, DE

Key dates

• Filing date: Oct 5, 1995
• Grant date: Dec 29, 1998
• Expiry date: Oct 5, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G69/28
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

To prepare nitrogen-containing polycondensates, a starting substance which still contains reactive end groups is dispersed in a high-boiling inert solvent, preferably in the presence of a dispersing auxiliary, low molecular weight by-products are distilled off at elevated temperature, the batch is cooled and the dispersed polycondensate is isolated. To prepare the starting substance, a mixture of at least two monomers which react with one another is heated up to a constant reaction temperature, a melt being formed at least in part, but initially no homogeneous melt occurring. The reaction is continued until a homogeneous melt is present. The precondensate formed is then dispersed in the high-boiling inert solvent and the condensation reaction is brought to completion.