Production of polyether polyols with reduced unsaturation
Patent 5010187 Issued on April 23, 1991. Estimated Expiration Date: 
November 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 18, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3393243 3446848 Barium oxide/cresylic acid catalyzed ethoxylation Ethoxylation with strontium bases Barium oxide catalyzed ethoxylation Reaction injection molded polyurethanes employing aliphatic amine chain extenders Process for preparing polyols Process for preparing nonionic surfactants-oxyalkylation with promoted barium catalysts Patent #: 4453023 InventorAssigneeApplicationNo. 273375 filed on 11/18/1988US Classes:536/120, Ethers521/159, N=C=X reactant having at least two C-NH-C(=X)- groups, e.g., prepolymers, etc.521/163, With nitrogen containing reactant521/167, Nitrogen reactant contains a N-(C-C-O)-group521/176, With non -C-X-C- containing reactant536/124, Processes568/618, Preparing from organic hydroxy containing compound (H of -OH may be replaced by a Group IA or IIA light metal)568/620And cyclic etherExaminersPrimary: Griffin, Ronald W.Assistant: White, Everett Foreign Patent References
International ClassesC07H 001/00C08B 037/00 AbstractPolyether 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. |
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