公开(公告)号：US4370468A

公开(公告)日：1983-01-25

申请号：US204276

申请日：1980-11-05

申请人： Osamu Nakajima ,  Yukinori Matsuoka ,  Yoshiaki Nakayama

发明人： Osamu Nakajima ,  Yukinori Matsuoka ,  Yoshiaki Nakayama

IPC分类号： B65D65/02 ,  B29C49/00 ,  B29C55/00 ,  B29C55/12 ,  B29C59/00 ,  C08G69/46

CPC分类号： B29C59/00

摘要： Provided is a biaxially drawn film composed substantially of polyhexamethylene adipamide, which has a refractive index of at least 1.560 in both the longitudinal direction and the transverse direction and an ultraviolet absorbance E.sub.268 of not more than 0.4, as measured at a wavelength of 268 m.mu. on a film solution in formic acid. The film preferably exhibits a shrinkage factor of not more than 5% in both the longitudinal direction and the transverse direction, as measured after dipping in hot water at 135.degree. C. for 10 minutes.The film is prepared by heat-treating a biaxially drawn polyhexamethylene adipamide film in an inert gas atmosphere at a temperature higher than the drawing temperature employed but lower than the melting point of the film.

摘要翻译： 本发明提供一种基本上由聚己二酰己二胺组成的双轴拉伸膜，其长度方向和横向的折射率至少为1.560，紫外线吸收率E268为波长268μm时测定的不大于0.4 在甲酸的薄膜溶液中。 在135℃的热水中浸渍10分钟后，膜的长度方向和横向的收缩率优选为5％以下。 通过在高于所用拉伸温度但低于薄膜熔点的温度的惰性气体气氛中热处理双轴拉伸的聚己二酰己二胺薄膜来制备薄膜。