Positive photosensitive planographic printing plate.

摘要

A positive photosensitive planographic printing plate comprising, on a support, a photosensitive layer comprising: (A) the o-naphthoquinonediazidosulfonic ester of a polyhydroxybenzophenone, or derivative thereof; and (B) a high-molecular weight compound comprising structural units of formula (I): <CHEM> wherein: R<1> and R<2> are each, independently, hydrogen, a halogen or an alkyl, aryl or carboxyl group; R<3> is hydrogen, a halogen or an alkyl or aryl group; R<4> is hydrogen, or an alkyl, aryl or aralkyl group; Y is an optionally substituted aromatic group, a carbon atom of which is attached to X if n is not O; X is a divalent organic group; and n is an integer of from 0 to 5. c