Basf Aktiengesellschaft

Basf Coatings Ag

Klaus Borho

Joachim Woltering

John Lynch

Oskar Buechner

Hans Gropper

Maximilian Bendix

Manfred Zuerger

Hans Henning Schneehage

Peter Hennenberger

Rudolf Vyvial

Peter Thoma

Werner Weinle

Karl K Mayer

Heinz Vogt

Klaus Hilligardt

Ernst-Juergen Schier

Ulrich Kalck

Farid Rizk

Karl-Heinz Sartor

Horst Bullack

Wolfgang Mach

Benno Knauer

Alfred F Hauss

Rolf Becker

Ulrich Hartig

Alfred Widmann

Dieter Fromm

Ewald Vollmerhaus

Wolf D Stege

Karl-Heinz Hennicke

Zafirios Grammatis

Gunter Schnabel

Heike Schuchmann

Michael Schiessl

Sven R&uuml;ck

Markus Antonietti

The invention relates to a process for preparing an aqueous powder coating dispersion, which comprises introducing a liquid melt comprising binders and crosslinking agents and also, if desired, catalysts, auxiliaries and further additives such as devolatilizers, UV absorbers, free-radical scavengers and/or antioxidants into an emulsifying apparatus, preferably with the addition of water and stabilizers, and cooling and filtering the resultant emulsion.

Aqueous powder-paint dispersion

A process for separating a liquid eutectic mixture by crystallization of one eutectic forming substance of the mixture on a cold surface to which seed crystals of the eutectic forming substance have been applied in the form of a seed crystal layer, and subsequent removal of the eutectic forming substance in liquid form after heating of the surface.

Separation of liquid eutectic mixtures by crystallization on cold

A continuous closed-system process for the environmentally friendly drying and purification of benzanthrone which comprises the steps of charging a benzanthrone-containing paste of pumpable consistency onto a melt held in a stirred kettle, dewatering and melting the paste by means of steam, condensing the water vapor emerging from the stirred kettle, flaking the melt from the stirred kettle by means of a rotating drum, and packaging the flaked solids.

Drying and purification of benzanthrone

Ethylene/.alpha.-olefin copolymers are prepared by catalytic dry-phase copolymerization of the monomers in a stirred or fluidized polymerization zone, transfer of the resulting mixture of solid copolymer and unconverted gaseous monomer into a let-down zone and separation of the mixture, after pressure reduction, into a gaseous phase and a solid phase, by a continuous process in which the solid phase is continuously flushed beforehand with gaseous ethylene and then flushed with a mixture of nitrogen and steam. The ethylene copolymers are very substantially free of residual monomers and odor and flavor substances.

Low pressure copolymerization of ethylene with .alpha.-olefins and

A process for isolating liquid urea and its thermal decomposition products from the off-gas of melamine synthesis, which gas has been freed from melamine by fractional condensation and then been washed with molten urea, wherein the off-gas, containing 2-10 kg of melt per kg of pure gas, is passed at 8-30 m/sec tangentially into the upper part of an axially symmetrical separation zone. As a result of the rotation imparted to the gas/liquid mixture, the two phases are separated from one another, and both pass downward through the separation zone. The gas and liquid are separately taken off at the bottom end of the separation zone. The residence time of the gas mixture in the separation zone is not less than 0.5 second.

Isolation of liquid urea from the off-gas of the synthesis of melamine

Multi-layer photopolymer elements, which are suitable for the production of relief printing plates and contain photosensitive polyvinyl alcohol/monomer layers which can be developed with water, can be improved in respect of their production, drying and shelf life by the application of a thin layer of a highly hydrolyzed low molecular weight polyvinyl alcohol.

Multi-layer elements with polyvinyl alcohol overcoat suitable for the

The invention relates to a process for rapidly letting-down the pressure in continuous high pressure polymerization systems for the polymerization of ethylene. In this process, the let-down hot reaction mixture is passed into an expansion vessel in such a way that the jet of let-down hot reaction mixture issuing from the let-down line is led into the partially water-filled expansion vessel at an angle of from 0.degree. to 45.degree. to the water surface, so that the jet does not enter below the surface but must touch or strike it. The method described makes it possible to let the mixture down partially and thus to slow down the decomposition in the case of explosive decomposition reactions occurring in the polymerization system.

Process for letting down ethylene high pressure polymerization systems

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Mutterstadt, Germany

Klaus Borho