申请人:UNITIKA LTD.
公开号:EP0943640A1
公开(公告)日:1999-09-22
The present invention provides a polyarylate film comprising 9,9-bis(alkyl-4-hydroxyphenyl)fluorene residue and bisphenol residue with a molar ratio of the former of in the range of 0.05 to 1 in which the carboxylic acid component is composed of terephthalic acid residue and isophthalic acid residue, wherein the polyarylate film having good abrasion resistance and heat resistance, being highly transparent and having less incident-angle dependent birefringence can be obtained by solvent casting of a polyarylate solution with an inherent viscosity in the range of 0.25 to 2.50. The film has high abrasion resistance, heat resistance and purity along with being excellent in such optical characteristics as high transparency and low birefringence, which is applicable as molding materials for use in electric, electronic and optical fields and in automobile industry; as insulating materials in electric appliances, power generators, capacitors and interlayer insulators; and as surface coating films as dielectric films for use in transformers, wire coating and capacitors, and substrates for liquid crystal display panel.
本发明提供了一种聚芳酸酯薄膜,该薄膜由9,9-双(烷基-4-羟基苯基)芴残基和双酚残基组成,前者的摩尔比在0.其中羧酸组分由对苯二甲酸残留物和间苯二甲酸残留物组成,通过溶剂浇铸固有粘度在 0.25 至 2.50 范围内的聚芳酸酯溶液,可获得耐磨性和耐热性良好、透明度高且随事件角而产生的双折射较小的聚芳酸酯薄膜。这种薄膜具有很高的耐磨性、耐热性和纯度,同时还具有高透明度和低双折射等优异的光学特性,可用作电气、电子和光学领域以及汽车工业中的成型材料;用作电器、发电机、电容器和层间绝缘体中的绝缘材料;以及用作变压器、电线涂层和电容器中的介质薄膜和液晶显示面板基板的表面涂层薄膜。