Covestro Deutschland Ag

Claudine Stoye

Marc-Stephan Weiser

Sebastian Dörr

Sascha Plug

Irene Cristina Latorre Martinez

Anna-Marie Zorn

Jan Suetterlin

Sascha Tadjbach

Thomas Voigt

Joerg Morawski

Thomas Guttmann

Karl H Wuehrer

Erkan Durgut

Thomas Schucht

The invention relates to a method for recovering a diisocyanate which is solid at room temperature from a distillation residue from a process for producing the diisocyanate, comprising the following steps: (i) mixing the distillation residue with a bitumen such that a mixture is obtained which contains 70 to 90 wt % of the distillation residue and 10 to 30 wt % of the bitumen, each in relation to the mixture, (ii) distilling the mixture in a thin-film evaporator or a falling film evaporator to obtain a sump discharge and a gaseous product stream, (iii) condensing the gaseous product stream and obtaining a solid containing the diisocyanate which is solid at room temperature. The invention further relates to the use of a thin-film evaporator or falling film evaporator, to a composition containing the diisocyanate which is solid at room temperature, and to a method for producing an elastomer from this composition and to the elastomer itself.

Method for diisocyanate recovery from distillation residues with bitumen

The invention provides a process for producing polyurethane foams, in which compositions comprising

Process for producing elastic and tear-resistant polyurethane foams and uses

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Cologne, Germany

Claudine Stoye