C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/12 (2006.01) C08G 18/10 (2006.01)
Patent
CA 2509133
The present invention provides a process for the preparation of at least one of a polyurethane prepolymer and a polyurethane-urea prepolymer involving mixing in a mixing nozzle at least one diisocyanate with at least one of a polyhydroxyl compound and a polyamino compound having a molecular weight of from about 400 to about 10,000, the mixing nozzle including a first inlet, an annular nozzle channel having a substantially constant diameter, a second inlet and connected through a channel to a dwell line, wherein the first inlet is in communication with the annular nozzle channel through one or more apertures therein, introducing the polyhydroxyl compound and/or polyamino compound into the annular nozzle channel via the second inlet, injecting the diisocyanate through the one or more apertures into the polyhydroxyl compound and/or polyamino compound in the annular nozzle channel and reacting the mixture of diisocyanate and polyhydroxyl compound and/or polyamino compound in the dwell line.
Frauenkron Guenter
Heidingsfeld Herbert
Bayer Materialscience Ag
Fetherstonhaugh & Co.
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