Production of poly(ethylene terephthalate)
January 20, 2015. 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 3405098 3544525 Process for the continuous production of high molecular weight polyethylene terephthalate Solid state polymerization of polyester prepolymer Preparation of high molecular weight polyester Process for the continuous polymerization of polyethylene terephthalate in the solid phase Glass fiber-reinforced thermoplastic polyester composition Oligomer pellets of ethylene terephthalate Process for the production of polyester Process for preparation of high-molecular weight polyester InventorsAssigneeApplicationNo. 376600 filed on 01/20/1995US Classes:528/308.1, Polyethylene Terephthalate per se525/437, 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 reactant528/308.2, Physically after-treated solid polymer528/308.3, Processes of preparing528/480, TREATING POLYMER CONTAINING MATERIAL OR TREATING A SOLID POLYMER OR A RESINIFIABLE INTERMEDIATE CONDENSATION PRODUCT528/492, Nitrogen containing528/503Temperature maintaining, heating or coolingExaminersPrimary: Acquah, Samuel A.International ClassC08G 063/16AbstractDisclosed herein is a novel crystalline form of low molecular weight poly(ethylene terephthalate). This crystalline form may be produced from molten or glassy low molecular weight poly(ethylene terephthalate) material by means of rapid heat transfer to or from the material. The poly(ethylene terephtalate) 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 SearchPolyethylene Terephthalate per sePhysically after-treated solid polymer Processes of preparing TREATING POLYMER CONTAINING MATERIAL OR TREATING A SOLID POLYMER OR A RESINIFIABLE INTERMEDIATE CONDENSATION PRODUCT Nitrogen containing Temperature maintaining, heating or cooling 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 | |
