发明授权
- 专利标题： Process for preparing biaxially stretched isotropic polyimide film
- 专利标题（中）： 双轴拉伸各向同性聚酰亚胺膜的制备方法
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申请号： US27912申请日： 1993-02-25
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公开(公告)号： US5324475A公开(公告)日： 1994-06-28
- 发明人: Masakazu Okahashi , Akimitsu Tsukuda , Tsuneyoshi Miwa , James R. Edman , Charles M. Paulson, Jr.
- 申请人： Masakazu Okahashi , Akimitsu Tsukuda , Tsuneyoshi Miwa , James R. Edman , Charles M. Paulson, Jr.
- 申请人地址： DE Wilmington
- 专利权人： E. I. Du Pont de Nemours and Company
- 当前专利权人： E. I. Du Pont de Nemours and Company
- 当前专利权人地址： DE Wilmington
- 优先权： JPX3-284490 19911030
- 主分类号： B29C55/14
- IPC分类号： B29C55/14 ; B29D7/01 ; C08J5/18 ; H05K1/03 ; B29C41/24
摘要：
An isotropic, biaxially stretched polyimide film prepared by casting a solution of a polyamic acid precursor in an organic solvent containing a cyclization catalyst and dehydrating agent onto the surface of a support, imidizing the polyamic acid to give a continuous self-supporting gel film containing 5-50% by weight of solids, stretching the gel film in the machine direction (MD) at a ratio of 1.1-1.9, and stretching in the transverse direction (TD) with respect to the machine direction so as to maintain a TD/MD stretch ratio of from 0.9 to 1.3.
公开/授权文献
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