Photosensitive composition and photosensitive lithographic printing plate

摘要

A photosensitive composition comprising a quinonediazide compound and a binder resin, wherein said resin is a resin obtained by condensing a phenol component comprising the following (1) to (3), and an aldehyde or a ketone, and X>/=0.57, where X=A/B, where A is an integrated value of peaks from 23.0 to 31.0 ppm, and B is an integrated value of peaks from 23.0 to 37.0 ppm, in the 13C-NMR spectrum of a dimethyl sulfoxide deuteride solution of this resin: Phenol Component (1) a phenol: from 50 to 100 mol % (2) a m-alkylphenol: from 0 to 50 mol % (3) a p-alkylphenol: from 0 to 50 mol %