Patent ID: 6010825
Filing Date: 2000-01-04
Classification: G03F

Abstract:
A negatively operating photoresist composition containing(a) a polyimide precursor containing repeating structural units of formula (I) ##STR28## in which A.sub.1 stands for an oxygen atom or an NH group;R stands for the same or different organic residues, at least one part of which can be photopolymerized;[X] indicates the residue of a cyclic dianhydride of the same or different tetracarboxylic acids remaining after removal of the anhydride groups; andY indicates the residue of the same or different diamines remaining after removal of the amino groups, and(b) a photoinitiator for polymerizing olefimic double bonds, characterized in thatR stands for organic residues, selected fromR.sub.1 organic residues with a photopolymerizable olefinic double bond, andR.sub.2 aryl residues, each of which have one or more substituents that improve the solubility of the photoresist composition in aqueous-alkaline media, andthe composition includes overall as many structural units of formula (I), which have residues R.sub.2, so that the composition can be developed by means of aqueous-alkaline developers for photoresists, which are free of organic solvents.