Basf Se Corporation

Markus Kraemer

Eckhard Stroefer

Heiner Schelling

Kai Thiele

Daniel Breuninger

Michael Zoellinger

Rolf Pinkos

Karl Haeberle

Dirk Kempfert

Ulrich Treuling

Matthias Eiermann

Frank Schaefer

Peter Van Den Abeel

Maria Thomas

Johannes Adam

Robert Reinhardt

Sven Lawrenz

Markus Bubolz

Kai Henke

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&#xb0; 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.

Process for producing polycarbodiimide

The present invention relates to a process for preparing an isocyanate, comprising hydrogenating a mixture (Gi) comprising an amine in the presence of a hydrogenation catalyst comprising copper to obtain a mixture (Gii) comprising the amine, and reacting the mixture (Gii) with phosgene to obtain a mixture (Giii) comprising the isocyanate. The present invention further relates to the isocyanate preparable by this process.

Process for preparing an isocyanate

The invention relates to a process for preparing methylenediphenyldiamine (MDA) by reacting formaldehyde and aniline in the presence of an acidic catalyst, wherein the oxygen content in the process for preparing MDA is &#x3c;10 000 ppm, based on all compounds present in the process. The invention further relates to the phosgenation of MDA to methylenediphenyl diisocyanate (MDI).

Method for producing color-stable MDA and MDI

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Radeburg, Germany

Markus Kraemer