RIGID POLYURETHANE FOAMS.

摘要

PROCESS FOR THE PREPARATION OF RIGID POLYURETHANE FOAMS COMPRISING THE STEP OF REACTING AN ORGANIC POLYISOCYANATE WITH AN ISOCYANATE - REACTIVE MATERIAL IN THE PRESENCE OF A BLOWING PROMOTER WHICH IS AN ISOCYANATE - REACTIVE CYCLIC CARBONATE OR CYCLIC UREA, AND IN THE PRESENCE OF AN INERT, INSOLUBLE ORGANICLIQIUD AND A MATEL SALT CATALYST AND A POLYETHER POLYOL OF AVERAGE NOMINAL FUCTIONALLY 2 TO 6 AND NUMBER AVERAGE EQUIVALENT MOLECULAR WEIGHT BETWEEN 1000 AND 2000.