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 | |