申请人:Asahi Kasei Kabushiki Kaisha
公开号:EP1170343A1
公开(公告)日:2002-01-09
There are provided a coating liquid for providing an infrared sensitive layer on a photosensitive resin surface, which is obtained by dissolving or dispersing in a specific ester solvent a binder polymer soluble in the solvent, an infrared absorbing substance and, if desired, a non-infrared opaque substance, and a process for obtaining a seamless photosensitive resin sleeve printing plate, which comprises using the same. In a photosensitive structure for a flexographic printing plate suitable for a plate making process comprising directly image-drawing with an infrared laser, the infrared sensitive coating liquid in accordance with the present invention is effective for obtaining a seamless photosensitive printing plate superior in ink coverage with advantages such that an infrared sensitive layer can be formed without any fault such as pinholes even on a photosensitive resin surface having a roughness caused by polishing with a grinder, repeat use of a squeegee rubber can be made possible in the case of carrying out a coating with a ring coater as a means for coating an infrared sensitive coating liquid, a work environment in a coating step of providing an infrared sensitive layer can be improved, the risk of an ignition explosion can be reduced, and moreover a roughness of a photosensitive resin surface caused by polishing with a grinder can be mitigated.
本发明提供了一种用于在感光树脂表面提供红外敏感层的涂布液,该涂布液是通过在特定的酯类溶剂中溶解或分散可溶于该溶剂的粘合剂聚合物、红外吸收物质以及(如果需要)非红外不透明物质而获得的,还提供了一种获得无缝感光树脂套筒印版的工艺,该工艺包括使用该涂布液。在柔版印刷版的感光结构中,本发明的红外感光涂层液适用于包括用红外激光直接进行图像绘制的制版工艺,可有效获得油墨覆盖率更高的无缝感光印刷版,其优点是即使在用磨光机抛光造成粗糙的感光树脂表面上也能形成红外感光层,而不会出现针孔等故障、在使用环形涂布机涂布红外敏感涂布液时,可以重复使用刮板橡胶,改善了提供红外敏感层的涂布步骤中的工作环境,降低了点火爆炸的风险,此外,还减轻了用磨光机抛光造成的感光树脂表面粗糙。