Process for producing polycarbodiimide

US9416213B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Markus Bubolz · Lüdenscheid, DE
• Karl Haeberle · Speyer, DE
• Kai Henke · Brockum, DE
• Dirk Kempfert · Dielingen, DE
• Markus Kraemer · Radebeul, DE
• Sven Lawrenz · Mannheim, DE
• Frank Schaefer · Lörrach, DE
• Maria Thomas · Nastätten, DE
• Ulrich Treuling · Bensheim, DE

Key dates

• Filing date: Sep 19, 2013
• Grant date: Aug 16, 2016
• Expiry date: Sep 19, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing a polycarbodiimide, comprising polymerizing a diisocyanate in the presence of a carbodiimidization catalyst in a reaction vessel in liquid phase at a temperature in the range of from 20 to 250° C., at a pressure in the range of from 20 to 800 mbar and in the presence of at least one inert gas, wherein the at least one inert gas is introduced into the liquid phase in the reaction vessel with a flow rate in the range of from 0.1 x/h to 100 x/h, x being the volume of the reaction vessel.