| abstract |
(57) [Summary] An amide group, a carboxyl group, A photosensitive composition containing a hydrophilic polymer having one or more kinds of crosslinkable functional groups selected from sulfonic acid groups and / or phosphonic acid groups and hydroxyl groups, a crosslinking agent and a light absorber, and the photosensitive composition. A lithographic printing plate having a photosensitive layer. The printing plate of the present invention is sensitive to light in the near-infrared region, so that it can be handled in a bright room, and the photosensitive layer after exposure changes from hydrophilic to ink-philic by irradiation with light, and thus can be developed and processed. No operation such as wiping is required, and the sensitivity, resolution and printing characteristics are excellent. |