| 摘要 |
It is intended to provide a solution of an ultra resistant polyimide comprising 4 components of pyromellitic dianhydride (PMDA), 1,4-diaminodiphenyl ether (DADE), biphenyltetracarboxylic dianhydride (BPDA) and 2,4-diaminotoluene (DAT), in which the molar ratio of (BPDA):(DADE):(PMDA):(DAT) is 2:2:m:m (wherein m is an integer of 3, 4 or 5).
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