Abstract
As an alternative pigment process in place of bichromated gelatin, a photopolymerization-type printing process based on the photoreduction of iron (III) salt to iron (II) salt was investigated. The iron (II) salt produced in the exposed area reacts with peroxide to produce hydroxyl radical which starts polymerization of acrylamide. In this paper each concentration of three components (acrylamide, N, N'-methylenebisacrylamide and iron (III) ammonium citrate) included in the photosensitive solution, which was coated on the support, was changed according to the experimental design, and an optimum composition for appropriate image characteristics was found. Sensitivity and gamma were on the same level with those obtained in the bichromated gelatin. The minimum thickness of the releaf image was about 1μm. As for this point the printing method established here is a little bit inferior to the bichromated gelatin.
