Bayer Aktiengesellschaft

Bayer Materialscience Ag

Covestro Deutschland Ag

Covestro LLC

Bayer Intellectual Property Gmbh

Bayer Materialscience, LLC

Covestro Intellectual Property Gmbh & Co. Kg

Coatings Foreign IP Co. LLC

Reinhard Halpaap

Hans-Josef Laas

Frank Richter

Josef Pedain

Wolfgang Fischer

Dieter Mager

Martin Brahm

Christian Wamprecht

Manfred Bock

Josef Sanders

Christoph Gürtler

Willi Dunwald

Dorota Greszta-Franz

Gerhard Klein

Oswald Wilmes

Dieter Arlt

Friedhelm Steffens

Markus Mechtel

Karsten Danielmeier

Lutz Schmalstieg

Helmut Reiff

Walter Leitner

Jan Mazanek

Thomas Ernst Müller

Klaus Nachtkamp

Joachim Probst

Bruno Bomer

Klaus Konig

Hanns P Muller

Robert John Barsotti

Hartmut Nefzger

Harro Traubel

Joachim Konig

Jurgen Reiners

Lothar Kahl

Reinhold M Klipper

Walter Schafer

Jurgen Meixner

Wilhelm Thoma

Laura Ann Lewin

Sebastian Dörr

Heike Heckroth

Michael Sonntag

Michael Schelhaas

Klaus Noll

Siegfried R Waldvogel

Philip E Yeske

Werner Kubitza

Ulrich Knipp

Tillmann Hassel

Rolf Gertzmann

Hans-Ulrich Meier-Westhues

Andreas Hecking

Michael Grahl

Wolfgang Schultz

Hans-Joachim Kreuder

Ulrich Freudenberg

Hans Schlegel

Christoph Thiebes

Tim Loddenkemper

Jan Busch

Hans J Laas

Martin Ehrig

Dietmar Wastian

Theodor Engbert

Myron W Shaffer

Stefan Groth

Harald Mertes

Rainer Rettig

Jürgen Köcher

Thomas Klimmasch

Fritz Puchner

Holger Casselmann

Manfred Keller-Killewald

Roland Richter

Wolfgang Kiel

Herbert Stutz

James William O'Neil

Meike Niesten

Peter Thometzek

Sigurd Buchholz

Robert Maleika

Heino Müller

Norbert Eisen

Siegfried Oeckl

Beate Baumbach

Jörg Tillack

Christian Zwiener

Gerald Kurek

Eberhard K&ouml;nig

Jurgen Grammel

Jerome T Adams

Ralph Weber

Jürgen Meixner

Ursula Tracht

Michael Ehlers

Carl-Gerd Dieris

Birgit Meyer Zu Berstenhorst

Jurgen Mosbach

James W Rawlins

The invention relates to a novel method for producing polyisocyanurates comprising isocyanate groups, based on 2,4- and 2,6-toluylene diisocyanate (TDI) and to the use thereof in coating compositions.

Method for producing TDI-trimerisates with high purity

The invention relates to a method for producing 1,5-pentanediisocyanate (PDI) by reacting 1,5-pentanediamine (PDA) with phosgene in the gas phase.

Method for producing 1,5-pentanediisocyanate in the gas phase

The invention relates to a method for producing the isomers 1,3- and/or 1,4-xylylene diisocyanates by reacting the corresponding 1,3- and/or 1,4-xylylene diamines with phosgene in the gaseous phase.

Method for producing xylylene diisocyanates in the gaseous phase

The invention relates to polyisocyanates comprising urethane groups, based on toluylene diisocyanate, to a method for their production, and to their use as the polyisocyanate component in one- and two-component polyurethane coatings.

Method for producing light-coloured TDI-polyisocyanates

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 invention relates to novel solvent-free, monomer-depleted polyisocyanate mixtures, and to the use thereof for producing light-resistant and weather-resistant polyurethane bodies with high optical refraction and low optical dispersion.

Polyisocyanate mixtures

A catalytic process for hydrogenating aromatic di- and polyamines with the aid of a selected catalyst system is provided, which comprises a mixture of a first heterogeneous catalyst and a second heterogeneous catalyst and a nitro compound (nitrate and/or nitrite salt). The first and second heterogeneous catalyst each independently comprise a metal selected from the group consisting of Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd and/or Pt and the metal selected for the second heterogeneous catalyst is different from the metal selected for the first heterogeneous catalyst. Hydrogenation of aromatic rings having two or more amino groups bound to the aromatic ring produces cycloaliphatic di- and polyamines, which are useful chemical intermediates, e.g., for further reaction with epoxides or isocyanates. The amino groups may also be converted to isocyanates via reaction with phosgene. The resulting cycloaliphatic di- and polyisocyanates may also be used as monomers for making polymers.

Process for hydrogenating aromatic di- and polyamines

The invention relates to the preparation of isocyanates by phosgenation of amines in the gas phase, with these isocyanates having a comparatively low proportion of color-imparting compounds.

Preparation of light-colored isocyanates

The invention relates to a process for preparing polyisocyanates containing isocyanurate groups by trimerising cycloaliphatic diisocyanates using a catalyst solution comprising at least one quaternary ammonium hydroxide, characterized in that the catalyst solution is metered in such that the reaction temperature is &#x3e;90&#xb0; C. and &#x2266;140&#xb0; C.

Process for trimerising cycloaliphatic diisocyanates

A process for hydrogenating aromatic di- and polyamines is provided comprising the steps of reacting the aromatic amine with hydrogen in the presence of a catalytic system, wherein the catalytic system comprises a heterogeneous catalyst comprising a metal selected from the group consisting of Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh, Ir, Ni, Pd and/or Pt and a support, and wherein the catalyst system further comprises an organic nitro compound. Hydrogenation of aromatic di- and polyamines having two or more amino groups bound to the aromatic ring produces cycloaliphatic di- and polyamines, which are useful chemical intermediates, e.g., for further reaction with epoxides or isocyanates. The amino groups may also be converted to isocyanates via reaction with phosgene. The resulting cycloaliphatic di- and polyisocyanates may also be used as monomers for making polymers.

Process for hydrogenating aromatic di- and polyamines to cycloaliphatic di- and polyamines

The present invention relates to an improved process for the preparation of polyisocyanates with a biuret structure by continuous reaction of excess amounts of organic diisocyanates having exclusively aliphatically and/or cycloaliphatically bonded isocyanate groups with organic diamines having exclusively aliphatically and/or cycloaliphatically bonded primary amino groups at elevated temperatures by 2-stage addition of the isocyanate component.

Process for the preparation of polyisocyanates with a biuret structure

The invention relates to a new industrial process for producing low-monomer-content organic polyisocyanates by oligomerization of organic diisocyanates in a two-phase system.

Process for producing low-monomer-content organic polyisocyanates

The invention relates to the use of specific pyridines as catalysts for the dimerization of isocyanates (uretdione formation) and a process for preparing polyisocyanates having a high content of uretdione groups.

Preparation of uretdione polyisocyanates

Growing community of inventors

Odenthal, Germany

Reinhard Halpaap