Evonik Degussa Gmbh

Degussa Aktiengesellschaft

Evonik Operations Gmbh

Manfred Kreczinski

Stephan Kohlstruk

Emmanouil Spyrou

Hans-Werner Michalczak

Gerda Grund

Dirk Hoppe

Holger Loesch

Rainer Elm

Matthias Woyciechowski

Robert Jansen

Sabine Naumann

Tobias Unkelhaeusser

Rainer Lomoelder

Christian Lettmann

Thomas Weihrauch

Martin Maier

Andrea Thesing

Lars Hellkuhl

Rainer Lomölder

Rainer Lom&ouml;lder

Yue Chang

Alina Meier

Uwe Korek

Marion Ewald

Tobias Unkelhäusser

Contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine is treated by A) 1. treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by alkaline hydrolysis of isophoronenitrile to isophorone, and the salts of hydrogen cyanide within a pH range of 12.0 to 13.7 and at temperatures of 60 to 200&#xb0; C. and 2. processing the wastewater from A) 1. by an oxidation, or B) treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by an oxidation, or C) processing the wastewater from A) 1. and the wastewater from the preparation of isophorone and/or the wastewater from the preparation of isophoronediamine by an oxidation.

Method for processing contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine

The present invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D),

Process for preparing isocyanates containing alkoxysilane groups

The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D),

A coating composition that includes an allophanate-containing compound can offer improved scratch resistance. The coating composition includes A) at least one allophanate-containing compound having the formula (1): wherein R, R-Rare each independently identical or different hydrocarbyl radicals having 1-8 carbon atoms, which may be branched or cyclic, or else may be integrated together to form a cyclic system, and m and n are each independently 0-2, B) a binder, C) optionally, an aliphatic or cycloaliphatic polyisocyanate having an NCO functionality of at least 2, D) optionally, a catalyst, E) optionally, an auxiliary and/or additive, and, F) optionally, a solvent.

Coating compositions comprising monoallophanates based on alkoxysilane alkyl isocyanates

A monoallophanate can be used in paint or adhesive compositions. The monoallophanate has the formula 1: where R, R-Rare each independently identical or different hydrocarbyl radicals having 1-8 carbon atoms, which may be branched or cyclic, or else may be integrated together to form a cyclic system, and m and n are each independently 0-2.

Monoallophanates based on alkoxysilane alkyl isocyanates

Contaminated wastewater from the preparation of isophorone, isophoronenitrile and isophoronediamine is treated by A) 1. treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by alkaline hydrolysis of isophoronenitrile to isophorone, and the salts of hydrogen cyanide within a pH range of 12.0 to 13.7 and at temperatures of 60 to 200&#xb0; C., and 2. processing the wastewater from A) 1. by an oxidation, or B) treating the wastewater from the preparation of isophoronenitrile from the reaction of isophorone with hydrogen cyanide by an oxidation, or C) processing the wastewater from A) 1. and the wastewater from the preparation of isophorone and/or the wastewater from the preparation of isophoronediamine by an oxidation.

Treatment of the wastewater from isophorone production comprising neutralization, filtration and a downstream chemical oxidation process and subsequent reduction. The invention relates to treatment of the wastewater from isophorone (IP) production comprising neutralization, filtration and a downstream chemical oxidation process and subsequent reduction.

Treatment of the wastewater from isophorone production comprising neutralization, filtration and a downstream chemical oxidation process and subsequent reduction

The present invention relates to a composition comprising (A) an isocyanate of formula (I) OCN-A-SiRRR(I), wherein A is straight-chain, branched, substituted and/or unsubstituted aliphatic hydrocarbyl of 1 to 12 carbon atoms or substituted or unsubstituted cycloaliphatic hydrocarbyl of 4 to 18 carbon atoms, wherein Ris selected from the group comprising &#x2014;O&#x2014;R, wherein Rand Rare each independently selected from the group of substituents comprising &#x2014;Rand &#x2014;O&#x2014;R, and wherein &#x2014;Ris hydrocarbyl of 1 to 6 carbon atoms, and B) a Bronstedt or Lewis acid or a compound which releases a Bronstedt or Lewis acid at room temperature; and also to a process for producing a stabilized alkoxysilane-containing isocyanate comprising the step of adding a Lewis or Bronstedt acid or a compound which releases a Bronstedt or Lewis acid at room temperature to an alkoxysilane-containing isocyanate.

Compositions comprising alkoxysilane-containing isocyanates and acid stabilisers

The invention relates to a method for producing diaminodiphenyl alkanes, wherein an aromatic amine, which can be substituted or unsubstituted, is reacted with a C1-C3 aldehyde in the presence of a heterogeneous catalyst, said catalyst being a mesoporous acidic ion exchanger based on a divinylbenzene/styrene copolymer and the catalyst having acid centers in a concentration of 2 to 6 eq/kg measured according to DIN 54403 and the average pore diameter of the catalyst particles being 10 to 32 nm measured according to ASTM D 4222, and the content of polynuclear compounds in the reaction mixture being &#x3e;10 and &#x2dc;15% by weight.

Method for producing diaminodiphenyl alkanes

The invention relates to a multi-stage process for the continuous, phosgene-free preparation of (cyclo)aliphatic diisocyanates that comprises the conversion of (cyclo)aliphatic diamines into the corresponding (cyclo)alkylene biscarbamates and the thermal cleaving of the latter into the (cyclo)alkylene diisocyanates and alcohol. The urea used in accordance with the invention and also the urea employed for the preparation of urea equivalents (e.g. alkyl carbonates, alkyl carbamates) as a possible precursor for the synthesis of the (cyclo)aliphatic biscarbamates is unconditioned.

Process for the continuous preparation of (cyclo)aliphatic diisocyanates

Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.

Low chlorine, multi-staged method for producing cycloaliphatic disocyanates

The invention relates to a method for producing diaminodiphenyl alkanes, wherein an aromatic amine, which can be substituted or unsubstituted, is reacted with a C1-C3 aldehyde in the presence of a heterogeneous catalyst, said catalyst being a mesoporous acidic ion exchanger based on a divinylbenzene/styrene copolymer and the catalyst having acid centers in a concentration of 4 to 6 eq/kg as measured according to DIN 54 403 and the average pore diameter of the catalyst particles being 10 to 32 nm as measured according to ASTM D 4222 10, and the content of polynuclear compounds in the reaction mixture being &#x2266;10% by weight.

Cycloaliphatic diisocyanates can be prepared continuously and phosgene-free by reacting at least one cycloaliphatic diamine with at least one carbonic acid derivative and at least one alcohol to give a cycloaliphatic diurethane; freeing the cycloaliphatic diurethane of a low boiler, a medium boiler and mixtures thereof; thermally cleaving the cycloaliphatic diurethane in a cleavage apparatus to give a cycloaliphatic diisocyanate and a cleavage residue; continuously discharging a portion of the cleavage residue from the cleavage apparatus; removing the high boiler components from the discharge to obtain a purified discharge; reurethanizing the purified discharge with alcohol to obtain a reurethanized discharge; and recycling the reurethanized discharge into the process.

Growing community of inventors

Herne, Germany

Manfred Kreczinski