| 摘要 |
Photosensitive element comprisng a polyester, e.g., polyethylene terephthalate, at least 0.008 inch (0.20 mm) thick bearing on both sides a polymeric water-vapor barrier layer at least 0.00001 inch (0.00025 mm) thick of a copolymer of vinylidene chloride containing at least 80% by weight of vinylidene chloride and minor amounts of alkyl acrylate, and itaconic acid, and on at least one side of said barrier layer, a layer of a photosenstive material, e.g., silver halide emulsion, diazo or photopolymer. The element in the form of a phototool limits dimensional change within 6 hours after exposure to a 5% Relative Humidity change to no more than 0.001 inch (0.025 mm) per 24 inches (60.96 cm).
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