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发明公开
CN110382602A 具有呋喃二甲酸单元的聚酯膜的制造方法 有权 转让

具有呋喃二甲酸单元的聚酯膜的制造方法
摘要：
本发明提供一种可以用于工业用途、包装用途的双轴取向聚酯膜的制造方法。一种双轴取向聚酯膜的制造方法，其特征在于，其包含下述工序：将聚酯树脂投入挤出机的工序；将熔融的上述聚酯树脂从挤出机挤出，得到250～310℃的熔融树脂片的工序；利用静电施加法使上述熔融树脂片与冷却辊密合而得到未拉伸片的工序；和对上述未拉伸片进行双轴拉伸的工序，上述聚酯树脂满足以下的(A)～(C)：(A)上述聚酯树脂包含利用呋喃二甲酸和乙二醇形成的聚呋喃二甲酸乙二醇酯树脂；(B)上述聚酯树脂的特性粘度为0.50dL/g以上；(C)上述聚酯树脂的250℃时的熔融电阻率值为3.0×107Ω·cm以下。
摘要（英）：

Provided is a method for producing a biaxially oriented polyester film that can be used for industrial applications and packaging applications. The method for producing a biaxially oriented polyesterfilm includes: a step in which a polyester resin is introduced into an extruder; a step in which the melted polyester resin is extruded from the extruder and a melted resin sheet having a temperatureof 250-310 DEG C is obtained; a step in which the melted resin sheet is brought into close contact with a cooling roller by applying an electrostatic charge and an unstretched sheet is obtained; and astep in which the unstretched sheet is biaxially stretched. The method for producing a biaxially oriented polyester film is characterized in that the polyester resin satisfies the conditions (A) to (C) indicated below. (A) The polyester resin contains a polyethylene furandicarboxylate resin comprising furandicarboxylic acid and ethylene glycol. (B) The intrinsic viscosity of the polyester resin is 0.50 dL/g or more. (C) The melt resistivity of the polyester resin at 250 DEG C is 3.0*107 Omega.cm or less.

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