Method of multistage solid-phase polycondensation of polyethylene terephthalate

A method of producing a polyethylene terephthalate, comprising performing a heat treatment of a polyethylene terephthalate prepolymer having an intrinsic viscosity of 0.18 dL/g or more and 0.40 dL/g or less in a solid state to provide an intrinsic viscosity of 0.70 dL/g or more, wherein the heat tre...

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Bibliographic Details
Main Authors YOSHIDA, MICHIKO, KIMURA, HISASHI
Format Patent
LanguageEnglish
French
German
Published 30.06.2010
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:A method of producing a polyethylene terephthalate, comprising performing a heat treatment of a polyethylene terephthalate prepolymer having an intrinsic viscosity of 0.18 dL/g or more and 0.40 dL/g or less in a solid state to provide an intrinsic viscosity of 0.70 dL/g or more, wherein the heat treatment in the solid state comprises a first-stage solid-phase polycondensation step, a temperature increase step, and a second-stage solid-phase polycondensation step in the stated order
Bibliography:Application Number: EP20100152497