Abstract: The preparation and use of polyurethane-based hot melt adhesives which are cross-linked under the influence of heat comprising reacting(a) a polyisocyanate component containing at least one organic polyisocyanate with(b) a polyol component containing(b1) at least one organic polyhydroxyl compound having a hydroxyl number of 50 to 400 and optionally(b2) at least one organic polyhydroxyl compound having a hydroxyl number above 400 used in a quantity of 0 to 100 hydroxyl equivalents percent, based on component (b1), optionally with the addition of(c) auxiliary agents and additives conventionally used in polyurethane chemistry and/or the technology of adhesives is disclosed.The reaction is characterized in that the equivalent ratio of isocynate groups of component (a) to all the isocyanate reactive groups present in component (b) is from 1:1 to 1.

Abstract: Thermoformable rigid foams are made by reacting an organic polyisocyanate with a polyol component. The polyol component includes at least one organic polyhydroxyl compound having a hydroxyl number of from 28 to 1200, a foaming agent, a catalyst and a compound which masks isocyanate groups. Preferred isocyanate masking compounds are .epsilon.-caprolactam and nonyl phenol. The foam thus obtained may then be molded and crosslinked by heating it to a temperature of from 150.degree. to 190.degree. C. These foams are particularly useful as interior trim for motor vehicles.