申请人:TEIJIN LIMITED
公开号:EP0091778A2
公开(公告)日:1983-10-19
A process for producing an aromatic polyamide film, which comprises drawing an undrawn aromatic polyamide film biaxially at a draw ratio of at least 1.5 in a solvent mixture consisting of (a) 5% to 75% by weight of a good solvent of the aromatic polyamide and (b) 25% to 95% by weight of a non-solvent of the aromatic polyamide, and heat treating the drawn film, which contains at least 1% by weight, based on the weight of the film, of a good solvent of said aromatic polyamide, at a temperature of not lower than 150°C.
An m-phenyleneisophthalamide polymer film having extremely excellent dimensional stability under moist conditions, which film has a density d of from 1.35 to 1.41 g/cm3 and principal refractive indices nα, nβ and nγ (nα > nβ, > nγ) for D-line of a wavelength of 589 nm satisfying the following formula:
一种芳香族聚酰胺薄膜的生产工艺,包括将未拉伸的芳香族聚酰胺薄膜以至少 1.5 的拉伸比在混合溶剂中进行双向拉伸,混合溶剂包括(a)5%至 75%(按重量计)芳香族聚酰胺的良好溶剂和(b)25%至 95%(按重量计)芳香族聚酰胺的非溶剂,然后在不低于 150°C 的温度下对拉伸薄膜进行热处理,热处理后的薄膜含有至少 1%(按重量计)的芳香族聚酰胺良好溶剂。
一种在潮湿条件下具有极佳尺寸稳定性的间苯异酞酰胺聚合物薄膜,该薄膜的密度 d 为 1.35 至 1.41 克/立方厘米,对于波长为 589 纳米的 D 线的主折射率 nα、nβ 和 nγ(nα > nβ, > nγ)满足下式: