| abstract |
PROBLEM TO BE SOLVED: To provide a positive photosensitive composition suitable as a recording material for a lithographic printing plate precursor for an infrared laser, which has excellent printing durability in an image area and significantly improves printing durability by a burning treatment. [MEANS FOR SOLVING PROBLEMS] (A) It contains a polymer compound having a polymerizable group or a crosslinkable group in a side chain, and (B) an infrared absorber. The embodiment in which the polymerizable group or the crosslinkable group is contained in the molecule by a structural unit having this in the side chain is preferable, and specifically has a structure represented by the following general formulas (1) to (4). Structural units are preferred. In the formula, A, B, X, L, M and Y each independently represent a single bond, an oxygen atom, a sulfur atom, —N (R) — or the like, and R represents a hydrogen atom or a monovalent organic group. . R 1 to R 24 each independently represents a monovalent organic group. [Chemical 1] [Selection figure] None |