Polymerizable composition and planographic printing plate precursor using the same

摘要

The present invention provides a polymerizable composition comprising (A) a compound including a polymerizable unsaturated group and (B) a macromolecular compound including, at a side chain thereof, a structure represented by the following general formula (I): Z^-M⁺ General formula (I) wherein Z^- represents COCOO^-, COO^-, SO₃^-, or SO₂-N^--R where R represents a monovalent organic group and M⁺ represents an onium cation. 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.