Patent ID: 8734609

Claim:
A process for the continuous manufacturing of moisture-curable polyurethane adhesives and sealants, comprising the following steps: feeding a polyol to an upstream section of a twin-screw extruder; feeding an isocyanate to the upstream section of said twin-screw extruder, such that the NCO/OH molar ratio of said isocyanate to said polyol ranges from 1.5 to 3.0; feeding a catalyst to said twin-screw extruder at a location downstream from said polyol and isocyanate; mixing said polyol, said isocyanate and said catalyst in said twin-screw extruder to homogenize the polyol, isocyanate and catalyst, and drive the polyurethane reaction and form a moisture-curable liquid polyurethane product; controlling flow of the polyurethane product from the extruder in response to extruder discharge pressure to thereby control the steps of feeding the polyol and feeding the isocyante to the extruder in order to maintain a constant extruder discharge pressure; transferring the moisture-curable liquid polyurethane product from said twin-screw extruder to a storage tank; and alternatively, either transferring the moisture-curable liquid polyurethane product from said storage tank to a packaging line, or re-circulating the moisture-curable liquid polyurethane product back to the storage tank.