| 摘要 |
1,125,460. Coated films. E. I. DU PONT DE NEMOURS & CO. 2 Jan., 1967 [3 Jan., 1966], No. 122/67 Heading B2E. [Also in Divisions C3 and G2] A photographic element comprises a base film 0.013 to 0.2 mm, thick of a polyester of a dihydric alcohol of formula HOCH 2 -WCH 2 OH where W is a methylene, polymethylene or alkyl-substituted polymethylene group containing 2-8 carbon atoms, a cyclo-alkylene group containing 5 or 6 carbon atoms or a single bond, with terephthalic acid or an ester derivative thereof, or a mixture of two or more such acids or ester-forming derivatives thereof, at least 15 more per cent of which is terephthalic acid or an ester forming derivative thereof, having on one or both its surfaces a layer of a co-polymer of (1) methyl or ethyl acrylate, (2) a dialkylphthalate or divinyl benzene, and (3) itaconic acid, in respective percentages by weight of 70-95, 3-30 and 2-20. The dispersions may be applied by dip or skim coating or by transfer rollers. The pH of the coating solution may be 3. Werner complexes may be included in the coatings as well as pigments or dyes. The film may be biaxially oriented and treated with an electric discharge, flame, U.V. light or by surface oxidation or the action of acid. Gelatin or gelatin-containing silver halide layers may be applied over the polymer coating. |
