| abstract |
The invention relates to rigid polyurethane foams, obtainable by reaction of A) organic or modified organic polyisocyanates or mixtures thereof, B) compounds having at least two isocyanate-reactive hydrogen atoms in the presence of C) optionally further polyesterpolyols, D) optionally polyetherol polyols, E) optionally flame retardants, F) one or more propellants, G) catalysts, and H) optionally further auxiliaries and / or additives, characterized in that component B) the reaction product of a1) 15 to 40% by weight of one or more polyols or polyamines having an average functionality of 2.5 to 8, a2) 2 to 30% by weight of one or more fatty acids and / or fatty acid monoesters, a3) 35 to 70% by weight of one or more alkylene oxides having 2 to 4 C atoms, contains. |