C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/130
C08G 18/08 (2006.01) C08J 3/12 (2006.01)
Patent
CA 2014927
CONTINUOUS PROCESS FOR THE PRODUCTION OF POWDERED POLYISOCYANATE ADDITION PRODUCTS AND THE POWDERS PRODUCED THEREFROM ABSTRACT OF THE DISCLOSURE The present invention is directed to a continuous process for the production of powdered polyisocyanate addition products in finely divided form which by simultaneously a) mixing a polyisocyanate component, an isocyanate-reactive component and an inert organic medium containing a surfactant, wherein at least one of the components is insoluble in the inert organic medium, in a low shear stator-rotor dynamic mixer operating at speeds of about 300 to 8000 rpm, utilizing a mixing wattage of about 0.05 to 10.0 watts per cubic centimeter and having a mixing volume of at least about 0.1 liters and b) reacting the polyisocyanate component with the isocyanate reactive-reactive component in the inert organic medium to form solid polyisocyanate addition products which can be separated from the inert organic medium to form a powder, the average residence time of the components and the inert organic medium in the dynamic mixer being about 3 to 300 seconds and the overall flow rate through the dynamic mixer being at least about 20 kg/h. The present invention is also directed to the powdered polyisocyanate addition products produced by this process.
Meckel Walter
Rosthauser James W.
Aktiengesellschaft Bayer
Meckel Walter
Miles Inc.
Rosthauser James W.
Swabey Ogilvy Renault
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