abstract |
[PROBLEMS] A photo or thermopolymerizable composition having a high sensitivity and a curing reaction that occurs and progresses, the cured film obtained has excellent hardness and good storage stability, and can be recorded with high sensitivity by infrared laser exposure. And a photopolymerizable composition suitable for a recording layer of a lithographic printing plate precursor having excellent printing durability and good storage stability. An alkali-soluble polymerizable polymer having a structure represented by the following general formula (I) in the side chain is contained. In the following formula, X represents a polymerizable group, and A represents an alkali-soluble group. Q represents a hydrocarbon linking group, and Z 1 and Z 2 represent a single bond or a hydrocarbon linking group. P 1 to P 5 each independently represent a linking group composed of a nitrogen atom, an oxygen atom, a sulfur atom, and> C═O. [Chemical 1] [Selection figure] None |