RIGID FOAMS WITH GOOD INSULATION PROPERTIES AND A PROCESS FOR THE PRODUCTION OF SUCH FOAMS

摘要

Rigid foams having good insulation properties are made by reacting a polyisocyanate with an isocyanate-reactive material in the presence of a blowing agent composed of greater than about 0.5 % by weight (based on total weight of foam forming materials) of water and less than about 12 % by weight (based on total weight of foam forming materials) of HFC-245fa.