PROBLEM TO BE SOLVED: To provide a polyimide film having excellent heat resistance, dimensional stability represented by a heat expansion coefficient, flexibility, and high transparency together.;SOLUTION: The polyimide film having not less than two polyimide resin layers is a polyimide film which includes at least one layer of the polyimide film of a polyimide resin layer (i) containing not less than 70 mol% of structural units produced from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl and pyromellitic dianhydride, and at least one layer is a polyimide resin layer (ii) having a low glass transition temperature and has a light transmittance of the polyimide film at a wavelength of 500 nm of not less than 75%, and a heat expansion coefficient of not greater than 30 ppm/K.;COPYRIGHT: (C)2013,JPO&INPIT
展开▼
机译:解决的问题:提供一种具有优异的耐热性,同时以热膨胀系数表示的尺寸稳定性,柔韧性和高透明性的聚酰亚胺膜;解决方案:具有不少于两个聚酰亚胺树脂层的聚酰亚胺膜是一种聚酰亚胺膜,其中包括至少一层聚酰亚胺树脂层(i)的聚酰亚胺膜,其包含不少于70mol%的由2,2′-双(三氟甲基)-4,4′-二氨基联苯和均苯四甲酸二酐产生的结构单元,和至少一层是玻璃化转变温度低的聚酰亚胺树脂层(ii),该聚酰亚胺膜在500nm的波长下的透光率为75%以上,热膨胀系数为30以下。 ppm / K .;版权所有:(C)2013,日本特许厅和INPIT
展开▼