| 摘要 |
959,036. Photosensitive compositions and processes. HORIZONS Inc. Jan. 3, 1961 [Jan. 8, 1960],No. 183/61. Heading G2C. A base as of synthetic resin or cellulose derivative has dispersed therein at least one N- vinyl compound, an organic chlorinating or brominating agent which can produce a free halogen radical and an inorganic iodine compound, and a supported film of this may be exposed to an ultraviolet lamp to give a thin print out image directly or may be given a shorter exposure and developed by heat or infrared to give a stable image of high contrast, such heating exhibiting the feature of fixing unexposed areas. Uses lie in the office copy field, direct camera work and such like. Details are provided in nine examples, thus in Example 1 bone dry sodium iodide is ground for three hours in a benzene-acetone mixture, added to a trichlorethylene solution of polystyrene with carbon tetrabromide and N-vinylcarbazole, spread on glass, dried in the dark, exposed through a negative to an ultraviolet lamp for 0.1 second at 10 inches and then to an infrared lamp for 45 seconds at 10 inches to give a brown-black positive image,which becomes deep black at a further minutes exposure. Other examples are similar with the variations of using (2) polyvinyl chloride with tetrahydrofuran as solvent, (3) sodium iodate instead of iodide, (4) potassium periodate with hexachloroethane and N-vinylpyrrolidone, (5) calcium iodate with tetrabromobutane and polyvinyl acetate as base, (6) cellulose nitrate base for the procedure of Example 1, (7) polyvinyl chloride with chlorinated biphenyl, carbon tetrabromide, N-vinylindole and potassium iodate, (8) N-vinyldiphenylaminewith potassium iodate; and Example 9 describes a 10 second exposure of the material of Example 1 to give a translucent printout image directly. Furthermaterials which may be used are listed. Specifications 916,779, 941,488, 959,033 and 959,034 are referred to. |
