Polyethylene terephthalate film, process for the production thereof and magnetic recording medium therefrom
申请人:TORAY INDUSTRIES, INC.
公开号:EP0086302A1
公开(公告)日:1983-08-24
Disclosed are a polyethylene terephthalate film having the sum of F-5 values in longitudinal and transverse directions of 3500 to 5000 kg/cm2, absolute shrinkages in lon- gltudinal and transverse directions at 100°C of up to 2.5% and an amorphous orientation factor of -1.5 to 0.5, a process for the production of the film and a magnetic recording medium having the film as a base. A polyethylene terephthalate film useful as a magnetic recording medium having super high-tensile strengths in both longitudinal and transverse directions and a low heat shrinkage is provided, while it has been considered that such properties could not be obtained in polyethylene terephthalate films.
本发明公开了一种聚对苯二甲酸乙二醇酯薄膜,其纵向和横向的 F-5 值之和为 3500 至 5000 kg/cm2,100°C 时纵向和横向的绝对收缩率最高为 2.5%,无定形取向因子为-1.5 至 0.5,还公开了生产该薄膜的工艺和以该薄膜为基材的磁记录介质。本发明提供了一种可用作磁记录介质的聚对苯二甲酸乙二醇酯薄膜,该薄膜在纵向和横向上都具有超高的抗拉强度和低热收缩性,而人们一直认为聚对苯二甲酸乙二醇酯薄膜无法获得这些特性。