Esterification process
February 8, 2020. 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 3056818 Process of preparing polytetramethylene terephthalate Tin-titanium complexes as esterification/transesterification catalysts Tin titanium complexes as esterification/transesterification catalysts Process for producing aromatic polyester Process for increasing the direct esterification reaction rate of a diacid with a glycol Poly(1,3-propylene terephthalate) Continuous polyester process Production of poly(ethylene terephthalate) Process for pellet formation from amorphous polyester InventorsAssigneeApplicationNo. 500340 filed on 02/08/2000US Classes:528/279, Material contains a Group IVB metal atom (Ti, Zr, Hf)524/755, Ether compound DNRM, e.g., aryl ether, dimethylether, etc.524/765, Alcohol compound as DNRM, i.e., R-OH524/783, Group IV or Group IIB, i.e., Ge, Sn, Pb, Zr, Ti, Hf, Zn, Cd, Hg528/283, Material contains a Group IVA metal atom (Ge, Sn, Pb)528/298, Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group528/301, Acyclic ether-oxygen compound528/302, Two or more carboxylic acid or derivatives or mixtures thereof528/308, Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid528/308.6Contains terephthalic acid or substituted forms thereofExaminersPrimary: Acquah, Samuel A.Foreign Patent References
International ClassC08G 063/78AbstractA process that can be used in an esterification and polycondensation processes to produce a polyester such as, for example, poly(trimethylene terephthalate) is disclosed. The process comprises contacting an acid with 1,3-propanediol in the presence of a catalyst comprising tin and titanium. A copolymer that contains up to 20 mole percent of another acid and/or a second alcohol is also disclosed. Further disclosed are a composition of, or comprising, a bis(3-hydroxypropyl) terephthalate prepolymer or a composition of, or comprising, a poly(trimethylene terephthalate) polymer. The bis(3-hydroxypropyl) terephthalate prepolymer and poly(trimethylene terephthalate) can each contain 10 to 100 ppm tin and 10 to 200 ppm titanium relative to the terephthalic acid content.Other References
Field of SearchMaterial contains a Group IVB metal atom (Ti, Zr, Hf)Material contains a Group IVA metal atom (Ge, Sn, Pb) Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group Acyclic ether-oxygen compound Two or more carboxylic acid or derivatives or mixtures thereof Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid Contains terephthalic acid or substituted forms thereof Ether compound DNRM, e.g., aryl ether, dimethylether, etc. Alcohol compound as DNRM, i.e., R-OH Group IV or Group IIB, i.e., Ge, Sn, Pb, Zr, Ti, Hf, Zn, Cd, Hg | |
