| 摘要 |
PROBLEM TO BE SOLVED: To obtain a photosensitive composition excellent in work efficiency, profitableness and preservation stability, usable as a material of an original plate for a planographic printing plate for scanning exposure adaptable to a CTP system or a planographic printing plate having high sensitivity to the oscillation wavelength of a low-cost short-wavelength semiconductor laser and using a new photopolymerization initiating system having high sensitivity in the wide wavelength range of 350-450 nm. SOLUTION: The photosensitive composition contains (i) a triplet sensitizing dye having its maximum absorption at 350-450 nm wavelength, (ii) an acylphosphine compound and (iii) a compound which reacts under at least one of a radical and an acid, varies at least one of its physical and chemical characteristics and retains the varies characteristic. |
