| 摘要 |
PURPOSE:To obviate the generation of scum and to permit the reuse of cleaning water by superposing a negative film on the surface of a water soluble photosensitive resin layer provided on a substrate, subjecting the resin layer to UV exposure to cure the resin and washing away the uncured part by the cleaning water contg. a specific defoaming agent. CONSTITUTION:The water soluble photosensitive resin layer contg. PVAL is provided on the surface of the substrate and the negative film is brought into tight contact with the surface thereof then the resin layer is subjected to the UV exposure from the negative side thereafter the cleaning water incorporated therein with a ethylene oxide/propylene oxide block copolymer having 500-4,000mol.wt. and 1-30wt% ethylene oxide content is sprayed onto the surface to wash away the uncured resin, by which a relief plate is obtd. The concn. of the defoaming agent in the cleaning water is made abut 0.005-5wt% and the photosensitive resin is constituted of the PVAL, photopolymerizable vinyl monomer and photosensitizer. The generation of scum is obviated by developing the resin layer after the exposure with the cleaning water contg. such defoaming resin. The sticking, etc. to a water storage tank are thus obviated. The defoaming agent has excellent durability and the cleaning water is reusable, by which the method is made advantageous in terms of cost. |
