Bayer Aktiengesellschaft

Erhard Schellmann

Roland Rupp

Martin Ullrich

Viktor Trescher

Peter Ziemek

Hans J Hennig

Wolfgang Kracht

Ernst Bocker

Kurt Bauer

Hildegard Schnoring

Werner Schulte-Huermann

Jurgen Lahrs

The present invention relates to a process for the preparation of compounds selected from the group consisting of a polyisocyanate containing urea groups and a polyisocyanate containing biuret groups comprising

Process for the preparation of organic polyisocyanates containing urea

Process for the preparation of organic polyisocyanates containing biuret

In a process for the continuous preparation of chloroformic acid methyl ester by contacting phosgene with methanol at a temperature of up to 50.degree. C. in a reactor which contains chloroformic acid methyl ester as the solvent and in which phosgene is dispersed, the improvement wherein gaseous phosgene is dispersed by already formed and circulated chloroformic acid methyl ester into the reaction chamber by means of a dispersing device, and at the same time methanol is introduced into the homogeneous gas-in-liquid dispersion.

Process for the preparation of chloroformic acid methyl ester

The containers to be tested are brought into an ultrasonic wave field of which the intensity is assessed so that defective containers are destroyed, while mechanically perfect containers remain unaffected. Since the containers destroyed fall out of their holders, sorting takes place simultaneously.

Method for testing filled glass containers

An apparatus for melt-spraying thermally sensitive material of low viscosity comprises a heatable multi-screw extruder having intermeshing, self-cleaning screws of specified clearance between the screws and between the screws and the extruder housing, a heatable pump for delivering molten material from the extruder to a heatable atomizer and a spray tank in which the atomizer is located for cooling and solidifying the melt-sprayed material.

Apparatus for the preparation of melt-sprayed spherical phenacetin

Substantially spherical granules of phenacetin are prepared by spraying liquid phenacetin which has been melted without decomposition by means of rapid passage through a melting device in which superheating is minimized. The resultant melt-sprayed granules are superior to crystalline phenacetin in the formulation of pharmaceutical tablets.

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Cologne, Germany

Erhard Schellmann