A heat-sensitive composition is disclosed which includes a substance which absorbs light and generates heat, an anionic self water-dispersible resin particle having an acid value of 10 to 300 and an average particle diameter of 0.005 to 15 µm, and a fluorine base surfactant. An original plate for a lithographic printing plate is disclosed which includes an ordinary negative- or positive-type PS plate having coated thereon the heat-sensitive composition. The original plate is image-wise exposed with high energy density light based on digital image information from a computer, subjected to first development with an aqueous alkali solution, flood exposure with active light, a second development with a developer for a negative or a positive, and post-treatment to obtain a printing plate.
本发明公开了一种热敏组合物,其中包括一种能吸收光并产生热量的物质、一种酸值为 10 至 300、平均颗粒直径为 0.005 至 15 微米的阴离子自
水分散性
树脂颗粒和一种
氟基表面活性剂。本发明公开了一种用于平版印刷板的原版,它包括一个普通的负型或正型 PS 版,其上涂有热敏组合物。根据计算机提供的数字图像信息,用高能量密度光对原版进行图像曝光,然后用碱
水溶液进行第一次显影,用有效光进行泛光曝光,用显影剂对底片或正片进行第二次显影,最后进行后处理,得到印版。