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Method of multistage solid-phase polycondensation of polyethylene terephthalate
Method of multistage solid-phase polycondensation of polyethylene terephthalate
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机译:聚对苯二甲酸乙二醇酯的多阶段固相缩聚方法
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摘要
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
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