Evonik Degussa Gmbh

Evonik Industries Ag

Michael Demming

Stephan Kohlstruk

Martina Ortelt

Dirk Fuchsmann

Anne Rittsteiger

Alexander Martin Rüfer

Jörg-Joachim Nitz

Christine Stemmer

Denise Ott

Anja Stasch

Axel Hengstermann

Matthias Orschel

Robert Jansen

Joerg-Joachim Nitz

Anja Mueller

Andreas Merkel

Jens Doering

Anja Müller

Jens Döring

Matthias Mendorf

Andreas Hoff

Anja Poschen

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

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.

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

A process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) is provided wherein distillation vapors from the work-up of product fractions are recycled to earlier stages of operation of the process.

Hydrolysis of the residues obtained in the production of isophorone to recover isophorone and acetone

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Dülmen, Germany

Michael Demming