Patent ID: 8927614
Filing Date: 2015-01-06
Classification: C08G,C08J

Abstract:
1. A process for producing a polyurethane, the process comprising: reacting an aromatic amine b1a) with propylene oxide and from 0 to 10% by weight of ethylene oxide relative to a total of propylene and ethylene oxide to obtain at least one polyether alcohol b1) having at least two hydrogens reactive to isocyanate, wherein the reaction of the aromatic amine with propylene oxide and optional ethylene oxide is catalyzed with dimethylethanolamine or imidazole, an amount of the catalyst amine is from 0.1 to 2.5% by mass based on the weight of all starting components, the aromatic amine b1a) is selected from the group consisting of aniline, toluenediamine (TDA), methylenedianiline (MDA) and polymethylenedianiline (PMDA), then reacting compounds b having at least two hydrogen atoms which are reactive toward isocyanate groups, with polyisocyanates a) to yield the polyurethane; wherein the compounds b) having at least two hydrogen atoms which are reactive toward isocyanate groups comprise the at least one polyether alcohol b1).