Highly soluble clear polyimides.

摘要

Highly soluble, optically transparent to clear aromatic polyimides in the visible range are disclosed. The dianhydrides from which the polyimides are prepared are 4,4 min -[2,2,2-trifluoro-1-(trifluoromethyl) ethylidene] bis(1,2-benzenedicarboxylic anhydride) which can be partially replaced with either pyromellitic dianhydride or 3,3 min ,4, min -benzophenone tetracarboxylic dianhydride. The diamines from which the polyimides are prepared are m- or p- phenylene diamines which are substituted ortho to the amino groups with primary or secondary alkyl groups having 1 to 6 carbon atoms preferably methyl or ethyl.