Poly(1,3-propylene terephthalate)
December 18, 2011. 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 ReferencesProcess of preparing polytetramethylene terephthalate Production of polyesters Process for the production of polyester copolymers Polyester and its use in powder coating High solids polyester polyols and resinous polyols thereof Process for preparation of polyester polyols utilizing polyalkylene terephthalate Polyester resins useful for forming containers having improved gas barrier properties Method for producing polybutylene terephthalate Process for the continuous production of high-molecular polybutyleneterephthalate Preparation of polyesters from terephthalic acid InventorsAssigneeApplicationNo. 809353 filed on 12/18/1991US Classes:528/276, Metal atom in elemental form528/272, From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof528/278, Metal atom has atomic number of 57-71, or 89 and higher528/279, Material contains a Group IVB metal atom (Ti, Zr, Hf)528/280, Material contains a Group VIII metal atom (Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt)528/283Material contains a Group IVA metal atom (Ge, Sn, Pb)ExaminersPrimary: Reddick, Judy M.Attorney, Agent or FirmInternational ClassC08G 063/78AbstractA process for producing poly(1,3-propylene terephthalate) from the reaction of either terephthalic acid or a lower dialkyl ester of terephthalic acid and 1,3-propanediol and polymerization of the monomer produced therefrom using a novel catalyst system. The novel catalyst composition includes employing an effective catalytic amount tin in the polycondensation reaction. Using the catalyst system and Hostaperm.RTM. pigments allows for the production of poly(1,3-propylene terephthalate) having yellowness of less than 4 and an IV of at least 0.80 dl/g.Field of SearchFrom di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereofMaterial contains a Group IVA metal atom (Ge, Sn, Pb) Metal atom in elemental form Polymerizing in the presence of a specified material other than reactant Material contains a metal atom Material contains a Group IVB metal atom (Ti, Zr, Hf) Material contains a Group VIII metal atom (Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt) | |
