| 摘要 |
<p>PCT No. PCT/US97/23043 Sec. 371 Date Jun. 1, 1999 Sec. 102(e) Date Jun. 1, 1999 PCT Filed Dec. 4, 1997 PCT Pub. No. WO98/24830 PCT Pub. Date Jun. 11, 1998Polyimide polymers from 3,4,3',4'-biphenyltetracarboxylic dianhydride and 3,4,3',4'-benzophenonetetracarboxylic dianhydride and a diamine such as p-phenylenediamine exhibit a high glass transition temperature, high thermal oxidative stability and low moisture regain, useful for structural applications.</p> |
