Bayer Aktiengesellschaft

Peter Fuhrmann

Walter Meckel

Werner Rasshofer

Wolfgang Henning

Herbert Stutz

Peter Heitkamper

Klaus Biskup

Eckart Waldau

Hans-Georg Frosch

Heinrich Grave

Johannes Koster

Christian Six

Helmut Porkert

Peter Keldenich

Franz Lamla

The present invention relates to a process for the manufacture of diisocyanates by phosgenation of the corresponding diamines in which the vaporous diamines, optionally rarefied with an inert gas or with the vapors of an inert solvent, and phosgene are heated separately to temperatures of about 200&#xb0; C. to about 600&#xb0; C. and mixed and reacted in a tube reactor characterized in that a number n&#x2267;2 of nozzles directed parallel to the axis of the tube reactor are arranged in the tube reactor, the diamine-containing stream being fed into the tube reactor through the n nozzles and the phosgene stream being fed into the tube reactor through the remaining free space.

Process for the manufacture of (poly-)isocyanates in the gas phase

A process for the decomposition of polyurethane plastic waste materials in which a compound containing at least two isocyanate-reactive hydrogen atoms (e.g., glycol) and polyurethane plastic, together with 2 to 20 times the amount of previously regenerated material, are treated in a mixing and comminution device.

Process for the decompostion of polyurethane plastics

The present invention is directed to a continuous process for the production of aqueous polyurethane dispersions by continuously mixing solutions of polyurethanes or isocyanate prepolymers dissolved in an organic solvent with water and subsequently continuously removing at least a portion of the solvent using a circulation-type evaporator. The present invention is also directed to the production of coatings or adhesives by applying the aqueous polyurethane dispersions to a substrate.

Process for the continuous production of aqueous polyurethane

The present invention relates to a process for the preparation of diisocyanates corresponding to the formula

Process for the preparation of (cyclo)aliphatic diisocyanates

The present invention relates to an improved process for the continuous production of alkylmonoisocyanates from commercial solutions containing N-alkyl carbamic acid chlorides by thermally decomposing the N-alkyl carbamic acid chlorides in the presence of inert solvents, and recovering the pure monoisocyanates by distillation.

Process for continuously working up solutions of the type accumulating

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Kö'ln, Germany

Peter Fuhrmann