Polyimides from bicyclo 4.2.0!octane-7,8-dimethyl-3,4,7,8- tetracarboxylic acid dianhydride (I) and bicyclo 4.2.0!octane-2,5 diphenyl-7,8-dimethyl-3, 4,7,8-tetracarboxylic dianhydride

摘要

Novel polyimides, copolyimides and molding compositions are prepared from novel dianhydrides such as bicyclo 4.2.0!octane-2,5 diphenyl-7,8- dimethyl,3,4,7,8-tetracarboxylic dianhydride and bicyclo 4. 2.0!octane-7, 8- dimethyl-3,4,7,8-tetracarboxylic acid dianhydride. The novel polyimides are useful as engineering plastics. The novel dianhydrides are useful for the preparation of the polyimides.