| 摘要 |
PROBLEM TO BE SOLVED: To provide high ink repellency by using an addition reacting material composed of a compound having two hydrogen silicon bondings or more in one molecule and a compound having two caron - carbon unsaturated bondings or more in one molecule in a silicone rubber layer formed on a base. SOLUTION: In a lithographic printing original plate having a positive light- sensitive layer and a silicone rubber layer formed on a base, the silicone rubber layer is formed of an addition reacted material composed of a compound having two hydrogen - silicone bondings or more in one molecule and a compound having two carbon - carbon unsaturated bondings or more in one molecule, and a compound containing azide as a light-sensitive group is contained in the light-sensitive layer. A compound containing an unsaturated bonding group and the like are contained in the light-sensitive layer. The thickness of the light-sensitive layer is preferably in the range of 0.5-100 micron. In the case the amount of the azide compound is small, photo-setting becomes insufficient, and the ratio of azide compound contained in the light-sensitive layer is preferably 5wt.% or more. |
