| 摘要 |
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 polyhydroxy l 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 connect ed through a channel to a dwell line, wherein the first inlet is in communicati on with the annular nozzle channel through one or more apertures therein, introducin g 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.
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