Production of polyether polyols with reduced unsaturation
AssigneeThe Dow Chemical Company
InventorAlbert J. Heuvelsland
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Abstract
Polyether polyols having an equivalent weight of from about 200 to about 5000 are prepared by the process of this invention. The process uses barium- or strontium-containing alkoxylation catalysts to provide products with reduced unsaturation in comparison to similar products produced with potassium hydroxide catalysis. The use of these catalysts also increases the capping efficiency with ethylene oxide to provide products with a higher primary hydroxyl content for the same weight percentage of ethylene oxide cap.
Claims10
A process for preparing a polyester polyol having an equivalent weight of from about 200 to about 5000 by reacting a monoepoxy compound comprising propylene oxide with an initiator containing at least two active hydrogens in the presence of a catalyst, wherein said catalyst is a substance selected from the group consisting of barium, strontium and their oxide, hydroxides, hydrated hydroxides or monohydroxide salts, or mixtures thereof and characterized in that the resulting polyol has a total unsaturation level of less than 0.080 milliequivalents/gram polyol.
Dependencies are inferred from the claim text.