| 摘要 |
<p>PE-0194 TITLE TETRAPOLYIMIDE FILM CONTAINING BENZOPHENONE TETRACARBOXYLIC DIANHYDRIDE Tetrapolyimide films derived from 3,3',4,4'-benzo-phenone tetracarboxylic dianhydride, pyromellitic acid dianhydride, p-phenylene diamine and 4,4'-diamino-diphenyl ether, and their preparation, are described. The tetrapolymer films have low water absorption, low coefficients of thermal and hygroscopic expansion, high modulus and are caustic etchable and can be used in flexible printed circuit and tape automated bonding applications.</p> |
