Basf Aktiengesellschaft

Basf Se Corporation

Basf Aktiengsellschaft

Andreas Johann Schmidt

Rudiger Sens

Karl-Heinz Etzbach

Matthias Kloetzer

Volker Krase

Eckhard Stroefer

Stefan Beckmann

Helmut Reichelt

Peter Pfab

Clemens Grund

Gerhard Wagenblast

Karl Siemensmeyer

Michael Ochse

Joachim Pfeffinger

Bernhard Geissler

Gerhard Laqua

Andreas Otterbach

Paul Delavier

Imbridt Murrar

Frank Wurthner

Dieter Starosta

Gisbert Franzke

Matthias Kl&ouml;tzer

Peter Scherbel

Friedrich-Wilhelm Raulfs

The invention provides a multistage process for continuously preparing organic, distillable polyisocyanates, preferably diisocyanates, more preferably aliphatic or cycloaliphatic diisocyanates, by reacting the corresponding organic polyamines with carbonic acid derivatives and alcohols to low molecular mass monomeric polyurethanes, and thermally cleaving said polyurethanes, in which at defined reaction stages the polyisocyanates prepared and unusable residues are separated off, and reusable by products and intermediates are recycled to upstream stages.

Process for the preparation of isocyanates

The invention relates to an improved multistage process for the continuous preparation of diisocyanates by reaction of the corresponding diamines with carbonic acid derivatives and alcohols to form low molecular weight monomeric urethanes and thermal dissociation of the latter.

Process for preparing isocyanates

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

A process for the preparation of isocyanates from carbamic esters.

Method for producing isocyanates

The present invention relates to a process for the dissociation of allophanates, in which a thermal dissociation is carried out in a reaction vessel and the gaseous dissociation products obtained are removed from the reaction vessel using an inert carrier gas or the vapor of a liquid as stripping medium and are condensed.

Thermal dissociation of allophanates

Trifluormethylpyridone based indolenine methine dyes

Methine and azamethine dyes based on trifluoromethylpyridones

The present invention relates to trifluoromethylpyridone-based methine and azamethine dyes of the formula I ##STR1## a process for their thermal transfer, a process for dyeing or printing synthetic materials and their use.

Methine dyes based on formylaminopyridones

Azamethine dyes

Liquid-crystalline compounds

Methine dyes of the formula ##STR1## where K is a 5- or 6-membered carbocyclic or heterocyclic radical,

Methine dyes containing a 5- or 6- membered carbocyclic or heterocyclic

Growing community of inventors

Freinsheim, Germany

Andreas Johann Schmidt