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US06913714B2 Method of producing thermoplastic polycarbonate films having low optical retardation values 失效
具有低光学延迟值的热塑性聚碳酸酯膜的制造方法

Method of producing thermoplastic polycarbonate films having low optical retardation values
Abstract:
A method of preparing a thermoplastic polycarbonate film having an optical retardation value of less than or equal to 20 nm, is described. The method includes: (a) forming a molten extrudate (20) of a thermoplastic polycarbonate polymer in an extruder (11) having a terminal die (17) through which the molten extrudate is passed, the molten extrudate having a temperature of 150° C. to 400° C. upon emerging from terminal die (17); and (b) passing molten extrudate (20), from die (17), between two counter-rotating rolls (23 and 26) each having an elastomeric polymer surface (35 and 38), the counter-rotating rolls having a roll speed ratio and a nip (41), the distance between the terminal die (17) and the nip (41) being a die-nip distance (47). The extrudate temperature, the roll speed ratio and the die-nip distance (47) are each selected such that a thermoplastic polycarbonate film (32) having an optical retardation value of less than or equal to 20 nm is formed.
Abstract(Chinese):

描述了制备具有小于或等于20nm的光学延迟值的热塑性聚碳酸酯膜的方法。 该方法包括：（a）在挤出机（11）中形成热塑性聚碳酸酯聚合物的熔融挤出物（20），该挤出机具有熔融挤出物通过的末端模头（17），熔融挤出物的温度为150℃ 在从端子模具（17）出来时达到400℃; 和（b）使来自模具（17）的熔融挤出物（20）在具有弹性体聚合物表面（35和38）的两个反转辊（23和26）之间通过，所述反向旋转辊具有辊速比 和辊隙（41）之间，所述端子模具（17）和压区（41）之间的距离为压模间隙距离（47）。 挤出物温度，辊速比和模夹间距（47）各自被选择成使得具有小于或等于20nm的光学延迟值的热塑性聚碳酸酯膜（32）形成。

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