Process for producing aromatic polyester
Patent 4611049 Issued on September 9, 1986. Estimated Expiration Date: 
April 25, 2005. 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.
April 25, 2005. 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 3594350 Process for preparation of polyesters Aromatic copolyester composition Process for manufacturing polytetramethylene terephthalate Process for forming thermally stable thermotropic liquid crystalline polyesters of predetermined chain length Patent #: 4539386 InventorsAssigneeApplicationNo. 06/727088 filed on 04/25/1985US Classes:528/279, Material contains a Group IVB metal atom (Ti, Zr, Hf)528/176, With polycarboxylic acid or derivative as reactant528/179, Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom528/180, Material contains a metal atom528/181, At least one transition metal atom528/195, Reactant is a nonphenolic compound having at least two hydroxyl groups or salts thereof528/274, Polymerizing in the presence of a specified material other than reactant528/286, Material contains a phosphorus atom528/298, Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group528/302, Two or more carboxylic acid or derivatives or mixtures thereof528/308.6, Contains terephthalic acid or substituted forms thereof528/308.8Processes of preparingExaminersPrimary: Lee, Lester L.Attorney, Agent or FirmInternational ClassesC08G 63/00 (20060101)C08G 63/82 (20060101) AbstractA process for producing an aromatic polyester having an aromatic dicarboxylic acid as a main acid component and trimethylene glycol or tetramethylene glycol as a main glycol component from a starting material composed mainly of an aromatic dicarboxylic acid or its functional derivative and trimethylene glycol or tetramethylene glycol; wherein at least one organometallic catalyst selected from the group consisting of organotitanium compounds and organotin compounds and at least one promoter selected from the group consisting of organic sulfonic acids and aliphatic carboxylic acids and being capable of increasing the catalyst activity of the organometallic catalyst are added to the reaction system so that the promoter increases the catalytic activity of the organometallic catalyst, and an aromatic polyester having an increased degree of polymerization is formed at an increased rate of polymerization.Field of SearchPolymerizing in the presence of a specified material other than reactantMaterial contains a Group IVB metal atom (Ti, Zr, Hf) Material contains a Group IVA metal atom (Ge, Sn, Pb) Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom Material contains a metal atom At least one transition metal atom With polycarboxylic acid or derivative as reactant Reactant is a nonphenolic compound having at least two hydroxyl groups or salts thereof Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group Two or more carboxylic acid or derivatives or mixtures thereof Contains terephthalic acid or substituted forms thereof Processes of preparing | |
