Bayer Aktiengesellschaft

Bayer Materialscience Ag

Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Ernst Sonderhoff Gmbh & Co. Kg

Bayer Intellectual Property Gmbh

Martin Brahm

Lutz Schmalstieg

Reinhard Halpaap

Josef Pedain

Frank Richter

Dieter Mager

Christian Wamprecht

Hans-Josef Laas

Wieland Hovestadt

Karsten Danielmeier

Werner Kubitza

Wolfgang Kremer

Eberhard Arning

Harald Blum

Joachim Probst

Jurgen Meixner

Jurgen Schwindt

Joachim Simon

Oswald Wilmes

Werner Mormann

Gerhard Ruttmann

Barbara Brahm

Manfred Schmidt

Christoph Gürtler

Dieter Margotte

Jan Mazanek

Reinhold M Klipper

Christoph Irle

Manfred Schonfelder

Andreas Hecking

Karl-Ludwig Noble

Raul Pires

Bernd Riberi

Rolf Roschu

Hermann Kober

Harald Mertes

Erhard L&uuml;hmann

Franz-Josef Bohne

Carl-Gerd Dieris

Robert Reyer

Marc Herrmann

Andreas Hauner

Franz-Josef Giesen

Anke Reinschmidt

Karl-Georg Bottger

Dietbert Knofel

Thomas Voigt

Eric Hoffman

Hans-Josef Lass

Burkhard Bl&uuml;mel

Harald Leps

Jürgen Walloschek

Jingchun Qian

Manfred Teichmann

André Fellhoelter

Alberto Carlos Gonzalez-Dorner

Hans-G&uuml;nter Behr

Ulrich Geron

J&ouml;rg Morawski

Evgeny Avtomonov

Andreas Otto

Robert Meiers

Daniel Mattheis

Andre Fellhölter

The invention relates to a process for the preparation of polyisocyanates with dimer, trimer and/or allophanate and optionally urethane structure.

Process for the preparation of polyisocyanates with dimer, trimer and/or allophanate and optionally urethane structure

The invention relates to a process for isocyanate modification which includes reacting a) at least one organic isocyanate having an NCO functionality greater than or equal to 1, b) a catalyst comprising at least one phosphonium salt comprising at least one cycloalkyl substituent bonded directly to a P atom of a phosphonium cation, c) optionally a solvent, and d) optionally additives. The present invention also relates to a catalyst for isocyanate modification comprising at least one phosphonium salt comprising at least one cycloalkyl substituent bonded directly to a P atom of a phosphonium cation.

Process for the preparation of polyisocyanates and use thereof

The invention relates to a method for modifying isocyanates using catalysts having a water content not exceeding 1,000 ppm.

Method for producing polyisocyanates and use thereof

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 a novel process for conditioning isocyanates. The purpose of conditioning of isocyanates or of mixtures of isocyanates is to remove organophosphorus components in a suitable manner such that the organophosphorus compounds no longer interfere with processing of the isocyanates.

Process for conditioning isocyanates

The present invention relates to a process for preparing polyisocyanates containing acylurea groups by reacting isocyanates corresponding to formula (I)R&#x2014;(NCO),&#x2003;&#x2003;(I) The present invention also relates to the reaction products (polyisocyanates) prepared by this process and to their use as binders for polyurethane coating compositions.

Polyisocyanates containing acylurea groups, a process for their production and their use

The invention relates to a novel process for preparing low-monomer-content trimers based on 2,4- and/or 2,6-diisocyanatotoluene (TDI). A catalytic trimerization is carried out in a mixture of from 20 to 80% by weight of a diisocyanate component containing at least 80% by weight of 2,4- and/or 2,6-diisocyanatotoluene, from 20 to 80% by weight of solvent, and 0&#x2013;20% by weight of an alcohol component, and also phenolic catalysts containing dialkylamino-methyl groups. In the course of ongoing trimerization, in one or more steps, additional monomeric 2,v4-diisocyanatotoluene is metered in.

Process for preparing low-monomer-content TDI trimers

The invention relates to a novel process for preparing low-monomer-content trimers based on 2,4- and 2,6-diisocyanatotoluene (TDI) and to the use thereof in coatings. The trimers are produced from a mixture of from 20 to 80% by weight of diisocyanate component containing at least 80% by weight of 2,4- and/or 2,6-diisocyanatotoluene and from 20 to 80% by weight of solvents and/or diluents and also phenolic catalysts containing dialkylaminomethyl groups.

The invention relates to polyether-modified, water-dispersible polyisocyanate mixtures, a process for their production and their use as initial component in the production of polyurethane plastics.

Highly functional polyisocyanate mixtures which are dispersible in water

Process for preparing organic monoisocyanates

Solvent-free binder compositions and their use in one-  and two-component coating compositions

An organic isocyanate or mixture of isocyanates is treated with at least one high molecular weight ester of phosphoric acid corresponding to a specified formula to remove chlorine compounds. The isocyanates which are purified in this manner are useful for the production of coatings, polyurethane moldings and chemical intermediates.

Method for reducing the chlorine content of low molecular weight isocyanates

Polyisocyanate mixtures containing acylurea groups

A process for the purification of organic isocyanates or isocyanate mixtures in which the amount of chlorine compound(s) present is reduced by mixing the isocyanate(s) or isocyanate mixtures with a gel-type or macroporous, anion-exchanging organic material having tertiary and/or quaternary amino groups. The process renders possible a purification of the isocyanates from chlorine-containing compounds which is milder than in conventional processes and is therefore particularly suitable for temperature-sensitive isocyanates.

Process for decreasing the chlorine content of organic isocyanates

Growing community of inventors

Odenthal, Germany

Martin Brahm