POLYETHER POLYOLS BASED ON AROMATIC DIAMINES AND POLYAMINES,A PROCESS FOR THEIR PREPARATION, AND THEIR USE FOR POLYURETHANE AND POLYISOCYANURATE PLASTICS

摘要

The present invention relates to polyether polyols having OH numbers of about 300 to 630 obtained by sequentially reacting 2,4- and/or 2,6-tolylenediamine or mixtures of 2,4and/or 2,6-tolylenediamine and one or more other aromatic amines with from about 1 to 2.5 moles of ethylene oxide for each NH2 group, and then with from about 0.5 to 5 moles of propylene oxide for each NH2 group, wherein said polyether polyols contain secondary amino groups comprising from about 2 to 20% of the isocyanate-reactive groups in said polyols and a free aromatic amine content of less than about 0.2% by weight. The present invention further relates to a process for preparing the polyether polyols of the invention, as well as to a method of using the polyether polyols for the preparation of polyurethane plastics.