HIGH TEMPERATURE STABLE POLYISOCYANURATE FOAMS

The present invention relates to a polyisocyanurate foam obtainable by reaction of a mixture in the presence of a catalyst and optionally an initiator comprising or consisting of: A) a polyisocyanate component containing at least one aliphatic polyisocyanate ; B) an isocyanate-reactive component containing at least one polyol and/or an alcohol and optionally an amine; C) at least one blowing agent; D) at least one foam stabilizer and E) optionally at least one additive, characterized in that the mixture upon co-use of an isocyanate-reactive component (polyol, alcohol, amine) has an index of at least 200. The invention further relates to a process for producing such a foam and to the use thereof as an insulation material, as a construction element, as façade insulation, as reactor insulation, as battery insulation, as superheated steam insulation, as still insulation or as weathering-resistant insulation material.