Patent ID: 8110704
Filing Date: 2012-02-07
Classification: C08G

Abstract:
1. A process for the production of a stable NCO prepolymer having an NCO content of from 2.5 to 6 wt. % and a viscosity at 100° C. of 5000 mPas comprising: a) reacting and b) rapidly cooling the prepolymer formed in a) in a manner such that the residence time of the prepolymer D) in the temperature range from the temperature at the end of a) to 70° C. does not exceed 72 hours, in which unreacted polyisocyanate still present after cooling is not removed and is present in an amount greater than 0.3 wt. % and less than 5 wt. %, based on the weight of the prepolymer.