Abstract
The disproportionating reaction of mercurous acetate was used in conjunction with polymeric carboxylic acid in order to produce a new type of photosensitive system. As for the polymeric acid, various copolymers of vinyl alcohol and acrylic acid were prepared by radical copolymerization of vinyl acetate and acrylic acid with varying monomer ratios and volumes of xylene used as a solvent. The polymeric acid was neutralized with sodium hydroxide and then converted to a mercurous salt. Photosensitive plates were prepared by coating glass plates with a dispersion of mercurous copoly(vinyl alcohol–acrylate).It was found that the plates were sensitive to ultraviolet light, and that a dark brown image was formed by a printing-out process. The latent image was proved to be developed by hydroquinone. Photographic image formation was due to metallic mercury which was isolated as a product of the disproportionating reaction. When immersed in an acetic acid solution, the photosensitive layer of the unexposed part swelled and became detached from the plate, but the layer of the exposed part was unchanged, and a relief image was fixed on the plate. The image formation was ascribed to ionic crosslinking by mercuric ions formed in the disproportionating reaction of mercurous ion.
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References
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Sugita, K., Suzuki, S. Photosensitive Ionomer. II. Preparation of Mercurous Copoly(vinyl alcohol–acrylate) and Properties of the Plate. Polym J 2, 283–288 (1971). https://doi.org/10.1295/polymj.2.283
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DOI: https://doi.org/10.1295/polymj.2.283