Production of poly(trimethylene terephthalate)
Patent 5763104 Issued on June 9, 1998. Estimated Expiration Date: 
December 12, 2016. 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.
December 12, 2016. 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 Patent #: 5633018 InventorsAssigneeApplicationNo. 764492 filed on 12/12/1996US Classes:528/503, Temperature maintaining, heating or cooling525/437, 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 reactant528/302, Two or more carboxylic acid or derivatives or mixtures thereof528/307, Cycloaliphatic ring-containing reactant (other than aryl)528/308Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acidExaminersPrimary: Acquah, Samuel A.Foreign Patent References
International ClassesC08F 006/00C08J 003/00 AbstractDisclosed herein is a novel crystalline form of low molecular weight poly(trimethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(trimethylene terephthalate) material by means of rapid heat transfer to or 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.Other References
Field of SearchSolid polymer derived from polyhydroxy reactant and polycarboxylic acid or derivative reactant; or derived from di- or higher ester of a polycarboxylic acid as sole reactantMixed with polycarboxylic acid or derivative and polyhydroxy reactant or polymer thereof Temperature maintaining, heating or cooling Fused- 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 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 | |
