Positive type photosensitive resin composition, positive type planographic printing plate precursor, and method for preparing a planographic printing plate

摘要

A positive photosensitive resin composition comprising a sulfonamide group and a polymer compound having a structure represented by the following formula A-1 in its main chain and an infrared absorbing agent. In the formula A-1, X represents-NR¹-,--S--or--O--, R¹Represents a hydrogen atom or an alkyl group, and each * independently represents a bonding position with another structure.