发明授权
- 专利标题： Polyethylene terephthalate film, process for the production thereof and magnetic recording medium therefrom
- 专利标题（中）： 聚对苯二甲酸乙二醇酯膜，其制备方法和磁记录介质
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申请号： US425960申请日： 1982-09-28
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公开(公告)号： US4497865A公开(公告)日： 1985-02-05
- 发明人: Satoyuki Minami , Kazuhiro Tanaka , Takeshi Nishioka
- 申请人： Satoyuki Minami , Kazuhiro Tanaka , Takeshi Nishioka
- 申请人地址： JPX Tokyo
- 专利权人： Toray Industries, Inc.
- 当前专利权人： Toray Industries, Inc.
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX57-22593 19820217; JPX57-33801 19820305
- 主分类号： B29C55/00
- IPC分类号： B29C55/00 ; B29C55/06 ; B29C55/14 ; B29C55/16 ; C08J5/18 ; G11B5/73 ; G11B5/68
摘要：
The present invention relates to a polyethylene terephthalate film having the sum of F-5 values in longitudinal and transverse directions of 3500 to 5000 kg/cm.sup.2, absolute heat shrinkages in longitudinal and transverse directions at 100.degree. C. of up to 2.5% and amorphous orientation factor of -1.5 to 0.5, a process for the production thereof and a magnetic recording medium containing the film as a base. The polyethylene terephthalate film useful as a magnetic recording medium having super high-tensile-strength 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 film.