| 摘要 |
PURPOSE:To provide the agent for correcting an offset printing plate capable of rapid and secure correction without adversely affecting human bodies and environments, capable of maintaining hydrophilicness for a long time after the correction, and superior in storage stability the correcting solution by incorporating a specified thioether compound as the correcting agent. CONSTITUTION:The thioether compound to be used for the agent for erasing unnecessary parts of a silver image formed on the offset printing plate to correct it is a compound represented by general formula (I) and this agent is used as the correcting solution by using water, various kinds of alcohols, or a mixture of some of them. A preferably concentration of this correcting solution is 0.1 - 20g/l, and it may contain a thickener for raising its viscosity, such as carboxymethyl cellulose, polyvinyl alcohol, or glycerin, and further, dyes, organic or inorganic pigments, or the like. This correcting solution is stable and odorless, and it can correct rapidly and perfectly, and no ink attaches to the corrected part even strongly rubbed after the correction, thus permitting a large number of prints to be made by using this offset printing plate corrected by this correcting agent. |
