PROCESS FOR PRODUCING RIGID POLYURETHANE FOAMS

摘要

The invention relates to a process for producing polyurethanes via reaction of a) polyisocyanates with b) compounds having at least two hydrogen atoms reactive towards isocyanate groups, characterized in that the compounds b) having at least two hydrogen atoms reactive towards isocyanate groups contain at least one polyether alcohol b1) which has been produced via reaction of an aromatic amine b1a) with propylene oxide with use, as catalyst, of an amine b1b) which differs from b1a).