Abstract: A method for producing a polyurethane flexible foam, which comprises reacting at least one high molecular weight polyol selected from the group consisting of a polyoxyalkylene polyol having a hydroxyl value of from 5 to 38 mgKOH/g, from 2 to 8 hydroxyl groups and a total unsaturation degree of not more than 0.07 meq/g and a polymer-dispersed polyol containing said polyoxyalkylene polyol as the matrix, an optional crosslinking agent and a polyisocyanate compound in the presence of a low viscosity compound having an addition-polymerizable unsaturated group, a catalyst, a foaming agent and a foam stabilizer.

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.

Abstract: The present invention is a room temperature curable polyurethane composition comprising as a curable component a polyurethane prepolymer having terminal isocyanate groups obtained by reacting an organic polyisocyanate and a polyol comprising as the main component a polyoxyalkylenepolyol having a molecular weight per hydroxyl group of from 1,500 to 15,000 and a total unsaturation degree of at most 0.07 meq/g.The above polyoxyalkylenepolyol having a molecular weight per hydroxyl group of from 1,500 to 15,000 and a total unsaturation degree of at most 0.07 meq/g, is produced by ring-opening addition polymerizing an alkylene oxide to an initiator, preferably by means of a double metal cyanide complex catalyst.By curing this curable polyurethane composition by moisture in air, a highly flexible cured product will be obtained.