Basf Aktiengesellschaft

Andreas Otterbach

Franz Merger

Tom Witzel

Wolfgang Schwarz

Hans Volkmar Schwarz

Peter Magnussen

Gerhard Laqua

Otto Mattner

Eckhardt Brandt

Bernd Bruchmann

Rainer Becker

Oral Aydin

Gerhard Auchter

Hans Renz

Roland Minges

Peter Pfab

Andreas Johann Schmidt

Ulrich Filges

Stefan Wolff

Matthias Kloetzer

Volker Krase

Peter Brandt

Hans V Schwarz

Dieter Starosta

Konrad Stiefenhofer

Ulrich Schoner

A reactor for the thermal cleavage of monofunctional and/or polyfunctional carbamic esters into the corresponding isocyanate and hydroxyl components in the liquid phase having devices for introduction of heat into the reactor, where the devices are heat exchanger plates through which a heat transfer medium flows and have a geometry defined by the ratio of the degassing area to the volume and arrangement of the heating surfaces which makes it possible for the cleavage to be carried out in a two-phase mixture which has a gas content of over 50% by volume.

Reactor for thermally cracking monofunctional and polyfunctional carbamates

Organic diurethanes and/or polyurethanes are prepared by reacting organic diamines and/or polyamines (a) with urea and/or alkyl cabamates (b) and alcohols (c) in the presence of soluble zirconium compounds, preferably zirconium alkoxides, zirconium acetate or zirconium acetylacetonate, as catalyst (d). They can be used for preparing diisocyanates and/or polyisocyanates by thermal dissociation.

Method of producing organic diurethanes and/or polyurethanes and their use in the production of di and/or polyisocyanates

In a reactor for the thermal cleavage of mono- and polyfunctional carbamic esters into the corresponding isocyanates and the hydroxyl component in the liquid phase, the geometry of the reactor, defined by the degassing area in relation to the volume and the arrangement of the heating surfaces, permits cleavage in a two-phase mixture which has a volumetric gas content of more than 50%.

Thermal cleavage of carbamic esters

Novel 2,2 -dialkylpentane-1,5-diisocyantes, 2,2-dialkylpentane-1,5-diurethanes and 2,2-dialkylpentane-1,5-dicarbamoyl chlorides of the formula ##STR1## where R.sup.1 and R.sup.2 are identical or different linear C.sub.1 -to C.sub.12 -alkyl, branched C.sub.3 - to C.sub.12 -alkyl, branched C.sub.2 - to C.sub.12 -alkenyl or branched C.sub.4 - to C.sub.12 -alkenyl,

2,2-dialkylpentane 1,5-diisocyanates, 2,2-dialkylpentane 1,5-diurethanes

Polyisocyanates containing isocyanurate groups are prepared by a partial trimerization of (cyclo)aliphatic diisocyanates in the presence of at least one trimerization catalyst selected from the group consisting of tetraalkylammonium alkyl carbonates of the formula (I) ##STR1## (quaternary ammonioalkyl) carbonates having a betaine structure of the formula (II) ##STR2## and the preferred use of the polyisocyanates containing isocyanurate groups which are obtainable in this way is aspolyisocyanate component in polyurethane finishes.

Preparation of polyisocyanates containing isocyanurate groups and use

A multistep process for the continuous preparation of organic polyisocyanates, preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to give monomeric polyurethanes and pyrolyzing the latter involves separating the resultant polyisocyanates and worthless residues in certain reaction steps and recycling the reusable by-products into earlier steps.

Multistep, continuous preparation of organic polyisocyanates

Silicon-containing polymers composed mainly of acrylates and/or

Growing community of inventors

Frankenthal, Germany

Andreas Otterbach