| 摘要 |
<p>1414245 Polyimides HITACHI Ltd 17 Oct 1973 [18 Oct 1972] 48406/73 Heading C3R [Also in Division H1] Polyimides of formula wherein m+n=x+y and m, n groups alternate with x, y groups are made by the reaction of diaminoaryl carbonamides, diaminoarylene compounds, and arylene acid dianhydrides. Preferably Ar 1 and Ar 3 are derived from benzene, naphthalene, diphenyl ether, diphenyl sulphone or di(phenoxyphenyl)sulphone, while Ar 2 and Ar 4 are derived from benzene, diphenyl ether or benzophenone. In the embodiment a solution of diaminodiphenyl-ether-3 carbonamide, diaminophenylether, pyromellitic acid dianhydride and benzophenonetetracarboxylic acid dianhydride in a molar ratio of 1 : 9 : 5 : 5 is coated on a silica surface on a semi-conductor device and polymerized in situ.</p> |
