PRODUCTION OF FOAMS HAVING IMPROVED PROPERTIES

摘要

The present invention relates to a composition for producing a polyurethane hard foam material, containing at least one polyol having a molecular weight of at least 1700 g/mol and at least one propellant as component A and at least one polyisocyanate as component B, wherein the at least one polyisocyanate B 11 contains up to 39.5 % by weight of a polyisocyanate prepolymer, based on a polyether polyol comprising a OH number of at least 100 mg KOH/g, to a polyurethane hard foam material, obtainable by conversion of said composition, to a method for producing such a polyurethane hard foam material, to the use of such a polyurethane hard foam material for insulation, in particular for pipe insulation, and to a method for producing an insulated pipe.