| 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 of a compound a), characterized in that as a compound b) polyether-polyols b1) are used which have been produced via reaction of an aromatic amine b1a) with alkylene oxide selected from propylene oxide or a combination of propylene oxide and to 5% by mass of ethylene oxide based on alkylene oxides, in the presence of one amine b1b) as catalyst which differs from b1a), wherein amine b1b) is used selected from the group consisting of trimethylamine, triethylamine, tripropylamine, tributylamine, N,N'-dimethylethanolamine, N,N'-dimethylcyclohexylamine, dimethylbutylamine, N,N'-dimethylaniline, 4-dimethylaminopyridine, N,N'-dimethylbenzylamine, pyridine, imidazole, N-methylimidazole, 2-methylimidazole, 4-methylimidazole, 5-methylimidazole, 2-ethyl-4-methylimidazole, 2,4-dimethylimidazole, 1-hydroxypropylimidazole, 2,4,5-trimethylimidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, N-phenylimidazole, 2-phenylimidazole, 4-phenylimidazole, guanidine, alkylated guanidines, 1,1,3,3-tetramethylguanidine, 7-methyl-1,5,7-triazabicyclo[4.4.0]dec-5-ene, 1,5-diazobicyclo[4.3.0]non-5-ene and 1,5-diazobicyclo[5.4.0]undec-7-ene. |
