C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/7412, 400/74
C08G 18/10 (2006.01) C08G 18/08 (2006.01) C08G 18/28 (2006.01) C08G 18/50 (2006.01) C08G 18/78 (2006.01)
Patent
CA 1304869
Mo-2712-CIP PU-174-CIP CONTINUOUS PROCESS FOR THE PRODUCTION OF AQUEOUS POLYURETHANE-UREA DISPERSIONS ABSTRACT OF THE DISCLOSURE The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by a) mixing an emulsifiable isocyanate- terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and b) reacting the dispersed isocyanate- terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion. Mo-2712-CIP
538737
Markusch Peter H.
Mason Arthur W.
Wenzel Wolfgang D.
Markusch Peter H.
Mason Arthur W.
Miles Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Wenzel Wolfgang D.
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