Production of poly(trimethylene terephthalate)
Patent 5990265 Issued on November 23, 1999. Estimated Expiration Date: 
June 22, 2018. 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.
June 22, 2018. 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 ReferencesSolid state polymerization of polyester prepolymer Process for pellet formation from amorphous polyester Apparatus for forming crystalline polymer pellets Production of poly(trimethylene terephthalate) Patent #: 5763104 InventorsAssigneeApplicationNo. 102511 filed on 06/22/1998US Classes:528/272, 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 thereof525/437, Solid polymer derived from polyhydroxy reactant and polycarboxylic acid or derivative reactant; or derived from di- or higher ester of a polycarboxylic acid as sole reactant525/444, Mixed with polycarboxylic acid or derivative and polyhydroxy reactant or polymer thereof528/298, Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group528/300, Polyhydroxy-containing compound or salt thereof having an ether-oxygen atom as reactant528/301, Acyclic ether-oxygen compound528/302, Two or more carboxylic acid or derivatives or mixtures thereof528/307, Cycloaliphatic ring-containing reactant (other than aryl)528/308, Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid528/308.6Contains terephthalic acid or substituted forms thereofExaminersPrimary: Acquah, Samuel A.International ClassC08G 063/02AbstractDisclosed herein is a novel physical form of low molecular weight poly(trimethylene terephthalate). This form may be produced from molten low molecular weight poly(trimethylene terephthalate) material by means of rapid heat transfer from the material. The poly(trimethylene terephthalate) composition is suitable for use as a starting material for solid-state polymerization in order to produce polymers of higher molecular weight.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 thereofFused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group Polyhydroxy-containing compound or salt thereof having an ether-oxygen atom as reactant Acyclic ether-oxygen compound Two or more carboxylic acid or derivatives or mixtures thereof Cycloaliphatic ring-containing reactant (other than aryl) Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid Contains terephthalic acid or substituted forms thereof Solid polymer derived from polyhydroxy reactant and polycarboxylic acid or derivative reactant; or derived from di- or higher ester of a polycarboxylic acid as sole reactant Mixed with polycarboxylic acid or derivative and polyhydroxy reactant or polymer thereof | |
