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US Patent 6255442 - Esterification process
US Patent Issued on July 3, 2001
Estimated Patent Expiration Date:
February 8, 2020Estimated 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.
Estimated Patent Expiration Date:
February 8, 2020Estimated 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.AbstractA 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
| 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 thereofField of Search528/279, Material contains a Group IVB metal atom (Ti, Zr, Hf)528/283, 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 acid528/308.6, Contains terephthalic acid or substituted forms thereof524/755, Ether compound DNRM, e.g., aryl ether, dimethylether, etc.524/765, Alcohol compound as DNRM, i.e., R-OH524/783Group IV or Group IIB, i.e., Ge, Sn, Pb, Zr, Ti, Hf, Zn, Cd, HgExaminersPrimary: Acquah, Samuel A.US Patent References3056818, 3936421, Process of preparing polytetramethylene terephthalateIssued on: 02/03/1976 Inventor: Hayashi , et al.4018708, Tin-titanium complexes as esterification/transesterification catalysts Issued on: 04/19/1977 Inventor: Vogt , et al.4020010, Tin titanium complexes as esterification/transesterification catalysts Issued on: 04/26/1977 Inventor: Vogt , et al.4611049, Process for producing aromatic polyester Issued on: 09/09/1986 Inventor: Kuratsuji , et al.5015759, Process for increasing the direct esterification reaction rate of a diacid with a glycol Issued on: 05/14/1991 Inventor: Lowe5340909, Poly(1,3-propylene terephthalate) Issued on: 08/23/1994 Inventor: Doerr, et al.5434239, Continuous polyester process Issued on: 07/18/1995 Inventor: Bhatia5510454, Production of poly(ethylene terephthalate) Issued on: 04/23/1996 Inventor: Stouffer, et al.5540868, Process for pellet formation from amorphous polyester Issued on: 07/30/1996 Inventor: Stouffer, et al.5633018, Apparatus for forming crystalline polymer pellets Issued on: 05/27/1997 Inventor: Stouffer, et al.5663281, Process for preparing high molecular weight polyesters Issued on: 09/02/1997 Inventor: Brugel5670606, Crystalline form of poly(ethylene 2,6-naphthalate) and a method for its production Issued on: 09/23/1997 Inventor: Stouffer, et al.5677415, Apparatus and process for a polycondensation reaction Issued on: 10/14/1997 Inventor: Bhatia5763104, Production of poly(trimethylene terephthalate) Issued on: 06/09/1998 Inventor: Stouffer, et al.5786443, Process of making polyester prepolymer Issued on: 07/28/1998 Inventor: Lowe5811496, Process for polymerization of polyester oligomers Issued on: 09/22/1998 Inventor: Iwasyk, et al.5840957, Transesterification process using lanthanum compound catalyst Issued on: 11/24/1998 Inventor: Kurian, et al.5891985, Soluble mono-alkyl stannoic acid catalyst and its use in preparing high molecular weight polyesters Issued on: 04/06/1999 Inventor: Brugel5990265, Production of poly(trimethylene terephthalate) Issued on: 11/23/1999 Inventor: Blanchard, et al.6093786Process for preparing polytrimethylene terephthalate Issued on: 07/25/2000 Inventor: Kelsey Foreign Patent References
International ClassC08G 063/78 |
