PHOTOSENSITIVE COMPOSITION AND PHOTOSENSITIVE LITHOGRAPHIC PRINTING PLATE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a negative photopolymerizable composition not causing fogging due to leakage light and having high sensitivity when the composition is exposed with a scanning exposure device using a laser which emits light at about 830 nm, and to provide a lithographic printing plate material using the composition.

SOLUTION: The photosensitive composition contains a sensitizing dye which imparts sensitivity in a wavelength region between 700 and 900 nm and a desensitizing dye which has absorption in the wavelength region and reduces sensitivity.

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