Colorless, transparent and heat resistant polyurethane films and methods for manufacturing the same

The present inventions concerns compositions for producing thermoset polyurethanes, comprising polyisocyanates and polyols selected from a list consisting of allicyclic, aromatic compounds and branched polyesters. The films obtained from these compositions exhibit a high transparency, high thermal stability and good chemical resistance, and a method to produce the same. The said polyurethane films can be widely used in electronics industry where high transparency, high thermal resistance and good chemical resistance are the main requirements. Particularly, these films can be used as the substrates for conductive coatings and barrier coatings. These functionally coated films are particularly useful in applications such as touch panels or photo-voltaic cells. 本发明涉及用于制备热固性聚氨酯的组合物，所述组合物包含多异氰酸酯和选自脂环族、芳族化合物和支化聚酯的多元醇。得自这些组合物的膜表现出高透明性、高热稳定性和良好的耐化学品性能，本发明还涉及制备所述膜的方法。所述聚氨酯膜可被广泛用于主要对高透明性、高耐热性和良好耐化学品性有要求的电子工业。具体地讲，这些膜可被用作导电涂层和阻挡涂层的基体。这些功能性涂布的膜特别适用于诸如触摸面板或光伏电池等应用。