| 摘要 |
PURPOSE:To enable easy plate making and to improve its printing characteristics by incorporating block isocyanate in a recording layer. CONSTITUTION:The recording layer containing the block isocyanate and a polymer having active hydrogen atoms capable of reacting with the isocyanate is formed on the hydrophilic surface of a base plate, and a substance capable of converting light into heat is added to at least either the base or the recording layer. It is imagewise exposed to high energy light to heat the recording layer through said substance and to form hydrophilic image parts, and then, the nonheated parts of the heat sensitive recording layer is washed and removed, thus permitting plate making to be easily executed only by a simple light irradiation means, such as means for irradiating laser beams, without requiring an expensive complicated plate making device, and its printing characteristics are improved. |
