Patent ID: 6974855

Claim:
Polyimide having a glass transition temperature (Tg) ranging up to about 300° C., high thermal-oxidative stability and decomposition-stability temperatures as high as 350° C. derived from the photochemical cyclopolymerization of approximately stoichiometric amounts of an aromatic ketone and at least one dienophile; said polyimide having a repeating unit of a formula selected from the group consisting of: wherein Ar in the repeating unit is the same or a different aromatic or substituted aromatic radical, R is selected from the group consisting of hydrogen, heteroaryl radicals, and lower alkyl radicals of 1 to 8 carbons, X is selected from the group consisting of nil, oxygen, sulfur, —C═O, —CH 2 , alkyl radicals of 1 to 8 carbons, ether radicals, ester radicals, and aryl radicals, and Y is selected from the group consisting of nil, oxygen, —CH 2 , —C═O, SO 2 , ether radicals, ester radicals, polyether radicals, polyester radicals, aromatic radicals, and alkyl radicals.