High-definition optical polyester film and preparation method thereof

The high-definition optical polyester film comprises a layer B and layers A located on the two sides of the layer B. The layers A comprise, by weight, 3-25 parts of polyester master batch E and 75-97 parts of polyethylene glycol terephthalate. And the layer B comprises the following components in parts by weight: 10-40 parts of modified polyester F and 60-90 parts of polyethylene glycol terephthalate. The high-definition optical polyester film prepared by the invention has the characteristics of clear film surface, clear film body, low haze, good mechanical property, thermal property, flatness, apparent quality and the like, and can be widely applied to the fields of high-end protection/release, window films, car cover films and the like. 一种高清光学聚酯膜，所述聚酯膜包括层B以及位于所述层B两侧上的层A，所述层A包含如下重量份数的组分：3重量份～25重量份的聚酯母料E和75～97重量份的聚对苯二甲酸乙二醇酯；所述层B包含如下重量份数的组分：10～40重量份改性聚酯F和60～90重量份聚对苯二甲酸乙二醇酯。本发明制备的高清光学聚酯膜具有膜面清晰、膜体清澈、雾度低、机械性能、热性能、平整度、表观质量好等特点，可广泛用于高端保护/离型、窗膜、车衣膜等领域。