| 摘要 |
PROBLEM TO BE SOLVED: To provide a photosensitive resin composition for a letterpress printing plate precursor, which is water-developable and excellent in suppressing deposition of paper power during printing.SOLUTION: The photosensitive resin composition comprises at least (A) a synthetic polymer compound, (B) a photopolymerizable unsaturated compound and (C) a photopolymerization initiator. The (A) compound is an addition polymer obtained by the reaction of (a) polyalkylene glycol-containing diamine including a propylene glycol component unit, (b) diamine including no tertiary amine but having a branched or alicyclic structure in a main chain, and (c) an organic diisocyanate compound. The proportion of polyalkylene glycol included in (A) is 50 mass% or more and 80 mass% or less. |
