Covestro Deutschland Ag

Bayer Materialscience Ag

Covestro Intellectual Property Gmbh & Co. Kg

Ernst Felske

Hans-Detlef Arntz

Manfred Schmidt

Hartmut Nefzger

Stefan Wershofen

Jens Krause

Reinhard Albers

Torsten Hagen

Stephan Schubert

Erhard Michels

James-Michael Barnes

Christian Hahn

Patrick Klasen

Claudia Houben

Frank Behrendt

Marion Frommont

The invention relates to a continuous method for producing an isocyanurate-containing isocyanate mixture, in which in a step a) a mixture of a first and a second isocyanate component and an isocyanate group trimerization catalyst is provided; in a step b) the mixture obtained in step a) is reacted in a first residence time zone at an elevated temperature; in a step c), the reaction mixture obtained in step b) is further heated in a second residence time zone, optionally after adding a stopper; and in a step d), the reaction mixture obtained in step c) is cooled down in a third residence time zone by way of lowering the temperature, thus obtaining the desired isocyanurate-containing isocyanate mixture.

Method for producing isocyanate mixtures containing isocyanurate groups

A method for producing a composition comprising polycarbodiimide, comprising the step of the reaction of a reaction mixture which contains an aromatic polyisocyanate and a carbodiimidising catalyst, wherein, before the reaction, the aromatic polyisocyanate is treated at a temperature of &#x2265;80&#xb0; C. to &#x2264;150&#xb0; C. and a pressure of &#x2265;1 mbar to &#x2264;500 mbar by passing through an inert gas and/or during the reaction, the reaction mixture is treated at a temperature of &#x2265;80&#xb0; C. to &#x2264;150&#xb0; C. and a pressure of &#x2265;1 mbar to &#x2264;500 mbar by passing through an inert gas and wherein the content of hydrolysable chlorine in the reaction mixture is &#x2264;10 ppm.

Method for producing a composition comprising polycarbodiimide having improved storage stability

The invention relates to a process for preparing liquid, storage-stable isocyanate mixtures having carbodiimide (CD) and/or uretonimine (UI) groups or prepolymers derived therefrom, wherein (i) in a first step, a starting isocyanate which is an organic isocyanate or a mixture of two or more organic isocyanates is partly carbodiimidized with a catalyst K of the formula cyclo-CHP(O)R, where the substituent R is a saturated or unsaturated, optionally substituted, especially halogen-substituted, organic radical, and then (ii) in a second step, the carbodiimidization reaction is stopped at a temperature of &#x2264;80&#xb0; C. by adding a stopper, the stopper used being an organic silane S of the general formula HSiX, where n is a natural number in the range from 1 to 3, where X is a saturated or unsaturated, optionally substituted, especially halogen-substituted, organic radical.

Process for preparing liquid, storage-stable organic isocyanates having carbodiimide and/or uretonimine groups and having low colour number

The present invention relates to NCO-terminated prepolymers that are stable to sedimentation, to a process for the production of these NCO-terminated prepolymers, and to the production of polyurethanes from these NCO-terminated polymers.

Process for the production of NCO prepolymers that are stable to sedimentation, and their use

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Neuss, Germany

Ernst Felske