Abstract: A polyol composition comprising a high concentration of ethylene oxide having a functionality of from about 2 to about 8, preferably 2; a polyisocyanurate composition having an isocyanate index of from about 180 to about 450 and comprising the reaction product of a polyisocyanate and the polyol composition; a rigid polyisocyanurate foam comprising the polyisocyanurate composition; and a process for making a polyisocyanurate foam which comprises reacting a polyisocyanate with the polyol composition in the presence of a trimerization catalyst.

Abstract: A process is disclosed for preparing an open-celled rigid polyurethane foam by reacting an organic polyisocyanate with a polyol in the presence of a blowing agent, a cell opening agent and exfoliating graphite, wherein the thermal conductivity of the foam is from 28 to 35 mw/mk. Such foams are applicable in the construction industry where it is desired to have a foam having flame retardation properties and a low thermal conductivity.

Abstract: A method for producing an open cell low-density semi-rigid polyurethane foam suitable for general use as a thermal insulating material and/or an acoustical applications is disclosed. The method comprises a method for producing a flame-retardant open-celled semi-rigid polyurethane foam having an overall density of 5 to 30 kg/m2 by reacting (a) a polyisocyanate and (b) a polyol having a molecular weight of 100 to 10,000, in the presence of (c) an effective amount of an exfoliating graphite, (d) blowing agent and (e) optional additional auxiliary substances to produce.