Photosensitive polyimide precursor compositions and process for preparing same

A process for preparing a photosensitive polyimide precursor composition, which process comprises adding an alcohol represented by the general formula

• R.sub.2 --OH,
• wherein R.sub.2 is selected from the group consisting of a monovalent organic group of 1 to 15 carbon atoms not containing unsaturated bond or a monovalent organic group of 3 to 15 carbon atoms containing unsaturated bond, to a tetracarboxylic dianhydride represented by the general formula, ##STR18## wherein R.sub.1 is a tetravalent organic group having 2 to 22 carbon atoms to form a tetracarboxylic monoester monoanhydride, then reacting said tetracarboxylic monoester monoanhydride and a tetracarboxylic dianhydride is represented by the general formula ##STR19## wherein R.sub.1 is a tetravalent organic group having 2 to 22 carbon atoms, with a diamine represented by the general formula
• H.sub.2 N--R.sub.3 --NH.sub.2,
• wherein R.sub.3 is a divalent organic group having 1 to 22 carbon atoms to form a poly(amic acid) wherein at least one molecular end of said poly (amic acid) is an acid ester of the alcohol, and thereafter mixing a compound containing carbon-carbon unsaturation having photoreactivity and a photo polymerization initiator with the poly(amic acid).