Process for preparing carbodiimides

Process for preparing carbodiimides

The present invention relates to a process for preparing polycarbodiimides, comprising (i) preparing a reaction mixture comprising a diisocyanate and a catalyst, and (ii) polymerizing the diisocyanate to give the polycarbodiimide in a stirred tank by heating the reaction mixture prepared in (i) to a...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: BUBOLZ, MARKUS, HAEBERLE, KARL
Format: Patent
Sprache:chi ; eng
Schlagworte:
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:The present invention relates to a process for preparing polycarbodiimides, comprising (i) preparing a reaction mixture comprising a diisocyanate and a catalyst, and (ii) polymerizing the diisocyanate to give the polycarbodiimide in a stirred tank by heating the reaction mixture prepared in (i) to a temperature in the range from 20 to 250 DEG C at a pressure in the range from 20 to 800 mbar, with stirring of the reaction mixture during the polymerizing with a stirrer apparatus, which comprises axial conveying of the reaction mixture axially to the axis of rotation of the stirring operation by virtue of the stirring operation.