RIGID, DIMENSIONALLY STABLE POLYURETHANE FOAMS AND A PROCESS FOR THE PRODUCTION OF SUCH FOAMS IN WHICH THE FOAM PRESSURE IS REDUCED

摘要

Rigid foams are made by reacting a polyisocyanate with an isocyanate-reactive composition which includes at least one isocyanate-reactive compound, preferably, an amine-initiated polyol and more preferably, an amine-initiated polyether polyol and a second, different polyol in the presence of a blowing agent composition which includes water and a catalyst composition which includes two different blowing catalysts, preferably, pentamethyldiethylenetriamine and bis(2- dimethylamino-ethyl)ether.