Process for increasing the direct esterification reaction rate of a diacid with a glycol
Patent 5015759 Issued on May 14, 1991. Estimated Expiration Date: 
December 8, 2009. 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.
December 8, 2009. 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 ReferencesProduction of tetramethylene terephthalate polymers using 225° to 248° C. polycondensation temperature Process for the continuous production of high-molecular polybutyleneterephthalate Patent #: 4680376 InventorAssigneeApplicationNo. 450911 filed on 12/08/1989US Classes:560/91, Polyoxyalkylene alcohol moiety528/279, Material contains a Group IVB metal atom (Ti, Zr, Hf)528/283, Material contains a Group IVA metal atom (Ge, Sn, Pb)560/90, Additional esterifying acid560/94, Preparing esters from acid or from nitrile and diol560/99, Metal containing catalyst utilized560/198, Polyoxy alcohol moiety560/204Preparing esters by esterification or carbonylationExaminersPrimary: Dees, Jose G.Assistant: Clarke, Vera C. Foreign Patent References
International ClassC07C 067/08AbstractA process for increasing the direct esterification reaction rate between a diacid and 1,4-butanediol and for directly esterifying greater than 95% of the acid ends of the diacid by mixing in any order the diacid, the 1,4-butanediol and a catalyst compound selected from organo-titanium, organo-tin, and organo-zirconium compounds, to form a reaction mixture wherein the ratio of diol:diacid is at least 2:1 and then reacting the reaction mixture at an average temperature ranging between 190° C. to 200° C. for a period of time no longer than sixty minutes. The same process may be followed substituting ethylene glycol for 1,4-butanediol, provided the catalyst compound is added neat, further provided that the average reaction temperature ranges from 190° C. to 200° C., and also provided that the reaction mixture be reacted for a period of time no longer than seventy minutes. The product resulting from this process may be polycondensed or further treated to form a high molecular weight polymer.Field of SearchPolyoxyalkylene alcohol moietyAdditional esterifying acid Preparing esters from acid or from nitrile and diol Metal containing catalyst utilized Polyoxy alcohol moiety Preparing esters by esterification or carbonylation Material contains a Group IVB metal atom (Ti, Zr, Hf) Material contains a Group IVA metal atom (Ge, Sn, Pb) |
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