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US 4,166,172 AGranted
Production of polyether polyol compositions
AssigneeTexas Development Corporation
InventorHoward P. Klein
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AssigneeTexas Development Corporation
InventorHoward P. Klein
Estimating the term…
An improved method for the production of polyether polyol compositions is disclosed wherein a polyhydric initiator is oxyalkylated with alkylene epoxides at lower temperatures in the presence of an aqueous ammonia solution. The polyether polyol compositions produced have desirable hydroxyl numbers and low viscosities and are particularly useful in the production of excellent rigid polyurethane foams. In addition to catalyzing the reaction, the nitrogen containing moiety itself undergoes oxyalkylation during the process such that the polyether polyol compositions produced contain, admixed therewith, various alkoxyalkanol amines. The alkoxyalkanol amines having reactive hydroxyl groups and acting as a mild catalyst for the polyolisocyanate reaction need not be removed from the polyether polyol composition. In addition, the alkoxyalkanol amines increase the blending compatibility of the polyether polyol compositions.
In a process for producing a polyether polyol composition wherein an alkylene oxide having from about 2 to about 4 carbon atoms or mixtures thereof is intimately contacted in the presence of a catalyst with a polyhydric nonreducing initiator having from about 2 to 8 hydroxyl moieties per molecule at temperatures ranging from about 30.degree. C. to 150.degree. C. the improvement which consists essentially of
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