Thermally stable rigid foams based on isocyanates with low brittleness and low thermal conductivity

摘要

a) polyisocyanates and;b) at least one polyether alcohol having a functional number of at least 1.5 and a hydroxyl number of from 10 to 100 mg KOH / g in an amount of 0.2 to 80 mass% based on component b), and;bii) at least one polyester alcohol in an amount of from 5 to 90 mass% based on component b);A compound containing two or more hydrogen atoms capable of reacting with an isocyanate group, including;c) water in an amount of up to 2 mass% based on the total amount of components b) to e).;d) in the presence of a physically working blowing agent, comprising a hydrocarbon, a fluorine-containing hydrocarbon or a mixture thereof in an amount of 5 to 30 mass% based on the total amount of components b) to e),;e) in the presence or absence of catalysts and auxiliaries, additives or mixtures thereof;The reaction can produce an isocyanate based, thermally stable rigid foam.