发明名称 |
ISOTROPIC POLYIMIDE FILM AND PROCESS FOR ITS PREPARATION |
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. |
申请公布号 |
WO9317069(A1) |
申请公布日期 |
1993.09.02 |
申请号 |
WO1993US00611 |
申请日期 |
1993.01.29 |
申请人 |
E.I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
OKAHASHI, MASAKAZU;TSUKUDA, AKIMITSU;MIWA, TSUNEYOSHI;EDMAN, JAMES, R.;PAULSON, CHARLES, M., JR. |
分类号 |
B29C55/14;B29D7/01;B32B15/08;C08J5/18;H05K1/03 |
主分类号 |
B29C55/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|