Système de photopolymérisation à base de sels cériques

1,125,937. Photo-polymerizable materials. GENERAL ANILINE & FILM CORP. Dec. 7, 1965, No. 51940/65. Heading G2C. A photo-polymerizable material comprises a support carrying a coating comprising a hydrophilic or lipophilic colloidal carrier, a watersoluble ceric salt, an ammonium or alkali metal salt of oxalic acid or of an aliphatic α-hydroxy carboxylic acid, and an ethylenically unsaturated monomer, the molar ratio of the organic salt to ceric salt being at least 3:1. Specified ceric salts are ceric ammonium sulphate and nitrate, ceric potassium nitrate, and ceric nitrate, sulphate, perchlorate and iodate. The monomer may be acrylamide, methacrylamide, methacrylic acid, acrylic acid, acrylonitrile, vinylpyrrolidone, vinylacetate, methyl acrylate or styrene, all of which may be used with cross-linking agents, e.g. N, N'-methylene bisacrylamide, N, N'- carboxymethylene bisacrylamide, calcium acrylate, divinyl benzene, N, N-di-alkylmelamine, or trialkyl cyanurate. The hydrophilic binder may be polyvinyl-pyrrolidone, polyacrylamide, gelatine, or hydroxyethyl cellulose, and the lipophilic binder may be a vinyl acetate/octyl fumarate/maleic acid copolymer.