申请人:Hashimoto Katsuyuki
公开号:US20080032144A1
公开(公告)日:2008-02-07
An object of the invention is to provide such an oriented polyester film that has a constant thickness, and is excellent in dimensional stability at a high temperature and dimensional stability to temperature change in a working temperature range. The invention relates to an oriented polyester film containing as a major component of a substrate layer polyethylene-2,6-naphthalene dicarboxylate, being stretched at least in one direction, and having a film thickness of from 12 to 250 μm, wherein (1) a coefficient of linear thermal expansion αt at a temperature of from 30 to 100° C. is from 0 to 15 ppm/° C. in both longitudinal and width directions of the film, and (2) a thermal shrinkage rate at 100° C. for 10 minutes is 0.5% or less in both longitudinal and width directions of the film.
本发明的目的是提供一种具有恒定厚度,且在高温下具有优异的尺寸稳定性和工作温度范围内的尺寸稳定性的定向聚酯薄膜。本发明涉及一种定向聚酯薄膜,其包含以聚乙烯-2,6-萘二甲酸酯为基材层的主要组分,至少在一个方向上拉伸,并具有12至250微米的膜厚,其中(1)在30至100℃温度下的线性热膨胀系数αt在膜的纵向和横向方向上均为0至15ppm/℃,且(2)在100℃下进行10分钟的热收缩率在膜的纵向和横向方向上均为0.5%或以下。