| 摘要 |
1,197,398. Photographic processes. NATIONAL CASH REGISTER CO. Sept. 17, 1968 [Oct.26, 1967], No.44067/68. Heading G2C. A process for producing film patterns comprises applying an amorphous photo-chromic layer of a spiropyran to a support, imagewise exposing to ultraviolet light, removing either the unexposed or exposed areas of the photo-chromic layer, applying a metal, di-electric or semiconductive film which is more adherent to the support than to the photo-chromic image, applying a pressure-sensitive adhesive tape and removing the tape and the film overlying the photo-chromic image areas to leave an image of the film which is directly applied to the support. Specified supports are glass and glazed ceramics and specified materials are metals such as chromium, nickel, tantalum, permalloy, tin, titanium aluminium, silicon monocide, cadnium selenide and germanium. In the examples, a glass support is coated with a solution of a mixture of benzoindiolinospiropyrano, imagewise exposed and developed with a non-polar solvent to removed the unexposed areas, cleaned by glow-discharge and the layer of metal 1000Š thick sputtered on under reduced pressure, a pressure-sensitive adhesive tape applied and pulled off removing the photo-chromic image and overlying metal leaving a metal image on the glass. A gold layer may be sputtered over the metal layer and after removal of the photo-chromic image, the glass support may be etched. Alternatively, the photo-chromic buyer may be uniformly exposed and ultraviolet light imagewise exposed to light of 6328Š and imagewise exposed areas removed. |
