Polyimides prepared from disubstituted aromatic tetracarboxylic acid dianhydrides

摘要

Fully cyclized polyimides based on aromatic tetracarboxylic acid dianhydrides with substitution in the positions ortho to the bridging moiety and aromatic diamines, exhibiting solubility in organic solvents, increased glass transition temperatures, low coefficients of thermal expansion and photoimagability; said polyimides being suitable for the production of films, protective coatings and photolithographic relief images.