Methods for producing polyether ester polyols and polyurethanes

Abstract

The present invention relates a method for producing a polyether ester polyol containing polycarboxylic acid residues in the vicinity of the terminals, by means of a doubles metal cyanide complex catalyst. Namely, the present invention is a method for producing a polyether ester polyol by reacting a polyether polyol having a hydroxyl value of at most 400, a polycarboxylic anhydride and a monoepoxide by means of a double metal cyanide complex as a catalyst. The present invention relates also to a process for producing a flexible polyurethane foam or a polyurethane elastomer using this polyether ester polyol. The flexible polyurethane foam produced has a high thermal fusing properties, and by laminating it with e.g. cloth, it is possible to obtain a laminate having high bond strength. Further, this polyurethane elastomer has superior physical properties as compared with an elastomer obtainable by using a polyether polyol or a polyester polyol.

Dependencies are inferred from the claim text.