Evonik Degussa Gmbh

Evonik Operations Gmbh

Jörg-Joachim Nitz

Stephan Kohlstruk

Martina Ortelt

Dirk Fuchsmann

Anne Rittsteiger

Alexander Martin Rüfer

Emmanouil Spyrou

Holger Loesch

Gerda Grund

Axel Hengstermann

Christian Lettmann

Anja Stasch

Eike Langkabel

Matthias Orschel

Robert Jansen

Guido Streukens

Markus Schwarz

Michael Demming

Denise Ott

Christine Stemmer

Jaclyn Balthasar

Susanne Kreischer

Andrea Diesveld

Franz Ulrich Becker

Martin Maier

Cord Knoop

Andrea Thesing

Andreas Merkel

Matthias Mendorf

Jan Cassens

Anja Müller

Jan Caßens

Markus Galle

Jens Döring

Stephanie Bajus

Juergen Lippe

Anja Poschen

Michael D Hinton

Rolf Hirsch

Norbert Richter

Andreas Hoff

Patrick Stier

Stephan Kohlstruck

Alexander Martin RÜFER

The invention relates to a process for preparing a diisocyanate of the formula (A)

Process for preparing diisocyanates based on lysine

A compound of the structural formula as a hardener in epoxy resin composition.

2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use

An epoxy resin composition including A) at least one epoxy compound and B) a hardener composition including B1) 0.1%-100% by weight of 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, and B2) 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.

Epoxy resin composition comprising 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine (AM-CPDA) as hardener

An epoxy resin composition including A) at least one epoxy compound, and B) a hardener composition including B1) from 0.1%-100% by weight of 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, and B2) from 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.

Epoxy resin composition comprising 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine as hardener

The present invention relates to 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, which can be used as hardener in epoxide applications.

Hardener composition including 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

A compound of the structural formula 1 A process for producing 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone nitrile and malononitrile to afford the intermediate 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile, and B) hydrogenating 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar.

The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (&#x3b2;-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.

Catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (&#x3b2;-isophorone) with hydrogen peroxide to afford 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone)

A process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine by A) reacting triacetonamine (TAA) and malononitrile to afford the intermediate 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile, and B) hydrogenating 2-(2,2,6,6-tetramethylpiperidin-4-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar. In another embodiment, the hydrogenation in step B) of the process is performed in two stages at 20-120&#xb0; C. and at 20-300 bar.

Process for producing 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine

A diamine 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine of formula 1  and a process for producing 2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone (IP) and malononitrile to afford the intermediate 2-(3,5,5-trimethylcyclohex-2-en-1-ylidene)malononitrile, and B) hydrogenating 2-(3,5,5-trimethylcyclohex-2-en-1-ylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120&#xb0; C. and at 20-300 bar.

2-(3,3,5-trimethylcyclohexyl)propane-1,3-diamine, a process for its production and use

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Essen, Germany

Jörg-Joachim Nitz