Polymerizable composition and planographic printing plate precursor using the same

摘要

The present invention provides a polymerizable composition comprising (A) a compoundincluding a polymerizable unsaturated group and (B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (I). The present invention also provides a negative type planographic printing plate precursor responsive to an infrared laser, the precursor being superior in recording sensitivity and printing durability and using the polymerizable compound as a recording layer. General formula (I)

         Z<Sup>-</Sup>M<Sup>+</Sup>

    wherein Z<Sup>-</Sup> represents COCOO<Sup>-</Sup>, COO<Sup>-</Sup>, SO<Sub>3</Sub><Sup>-</Sup> or SO<Sub>2</Sub>-N<Sup>-</Sup>-R where R represents a monovalent organic group and M<Sup>+</Sup> represents an onium cation.