Bayer Materialscience Ag

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Arlanxeo Deutschland Gmbh

Lanxess Deutschland Gmbh

Allnex IP S.a.r.l.

Ursula Tracht

Sigurd Buchholz

Wolfgang Fischer

Manfred Schmidt

Reinhard Halpaap

Johann Rechner

Frank Richter

Thomas König

Hanns-Ingolf Paul

Ulrich Liesenfelder

Michael Ludewig

Johan Vanden Eynde

Hans-Georg Pirkl

Andreas Hecking

Rolf Bachmann

Ricarda Leiberich

Torsten Hagen

Udo Wiesner

Peter Weuta

Frank Bruynseels

Björn Henninger

Robert Vieler

Martin Anstock

Andreas Gosch

Stephan Laue

Uwe Arndt

Claudia Willems

Philip Bahke

Adrian Cosmin Dobre

Michael Berger

Frank Doebert

Andreas Stremmel

Christoph Biedron

Frank Quaeyhaegens

Johan Decloedt

Paul Van Dorst

A process for continuous preparation of oligomeric or polymeric isocyanates by catalytic modification of monomeric di- and/or triisocyanates, characterized in that at least one isocyanate component A and at least one catalyst component B are combined continuously in a reaction apparatus and conducted through the reaction apparatus as a reaction mixture, the residence time distribution being characterized according to the dispersion model by Bo (Bodenstein number) above 40, preferably above 60 and most preferably above 80.

Process for continuous isocyanate modification

The present invention relates to a method to control a liquid feed stream carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity. In a further aspect the invention relates to a controlled process for the preparation of polymers in a polymerization reactor by contacting liquid feed streams comprising monomers and initiators or catalysts, whereby the control of the feed streams entering the polymerization reactor and/or the initiator or catalyst preparation is carried out by measuring at least one spectrum of the liquid feed stream comprising an initiator or catalyst, determining its activity using a predictive model on the basis of said spectrum and adjusting the feed streams and/or the preparation conditions of the feed stream comprising the initiators or catalysts in order to attain or maintain a desired level of total activity within the polymerization reactor. More particularly, the invention relates to a method for controlling the activity of aluminum containing initiators in a process for the co-polymerization of isolefins and multiolefins, in particular isobutylene and isoprene. The present invention further to device and a chemical plant suitable to operate said process.

Activity monitoring and polymerization process control

The present invention relates to the technical field of isocyanates. The present invention provides a method for preparing NCO prepolymers by reacting a stoichiometric excess of an organic isocyanate with an isocyanate-reactive component, the reaction components being mixed together and the mixture being introduced directly into a storage or transport vessel, where it reacts to completion.

Method for preparing polyurethane prepolymers containing isocyanate groups

The invention relates to a process for the pretreatment of material surfaces in order to minimize the interaction between polycarbonate and metal and, in the processing and synthesis of polycarbonate, to obtain a high-quality polymer which in particular does not become discolored and is free of insoluble constituents.

Process and apparatus for the preparation of polycarbonate

The invention relates to a continuous process for preparing radiation-curable prepolymers containing urethane groups, more particularly urethane acrylates.

Process for preparing radiation-curable prepolymers containing urethane groups

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Leverkusen, Germany

Ursula Tracht