| 摘要 |
An aromatic polyimide film favorably employable for the chip-on-film (COF) system is composed of a polyimide derived from 3,3',4,4'-biphenyltetracarboxylic acid dianhydride and p-phenylenediamine and a powdery inorganic filler, in which the film has a thickness in the range of 25 to 35 mum and does not have protrusions of 1 mum or higher, and the filler has a mean diameter of less than 1 mum.
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