Positive-working photosensitive composition with o-quinone diazide and admixture of resins

Abstract

A positive-working photosensitive composition comprising (a) an o-quinonediazide compound and (b) a condensed resin containing a condensation unit composed of an aromatic compound having a carboxylic group and a phenolic ahydroxyl group, and an aldehyde or ketone is disclosed. Said condensation unit has the following formula (I): ##STR1## wherein R.sub.1 is a hydrogen atom, a hydroxyl group, an acyloxy group, an alkyl group, an alkoxy group or a halogen atom, which may be the same or different when n is 2; R.sub.2 and R.sub.3 are each a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms, a phenyl group or a substituted phenyl group, which may be the same or different; and n is 1 or 2.

Dependencies are inferred from the claim text.