| 摘要 |
<p>The invention relates to a method for producing rigid polyurethane or polyisocyanurate foams, having the step of reacting A) at least one polyisocyanate, B) at least one fatty-acid modified polyether polyol, C) at least one polyether polyol, D) optionally one or more polyols which differ from those of components B) and C), E) optionally one or more flame retardants, F) one or more propellants, G) one or more catalysts, and H) optionally other auxiliary agents and/or additives. The invention is characterized in that component C) is obtained using a method having the steps of c1) reacting ortho- tolylenediamine and optionally other co-starters with at least one alkylene oxide comprising ethylene oxide, the content of ethylene oxide being more than 20 wt.% relative to the quantity by weight of the alkylene oxides, and then c2) reacting the reaction product from step c1) with at least one alkylene oxide comprising propylene oxide in the presence of a catalyst, the content of 1,2-propylene oxide being more than 20 wt.% relative to the quantity by weight of the alkylene oxides. The invention further relates to the polyol components comprising the aforementioned components B) and C) and optionally D), E), F), G), and H).</p> |
