| 摘要 |
739,477. Heat-mouldable photographic silver halide film. DU PONT DE NEMOURS & CO., E. I. March 16, 1954 [June 16, 1953], No. 7665/54. Class 98 (2). Designed for production of an image or picture such as a relief map, wall plaque or lamp shade on an irregular surface by heatmoulding before or after exposure and processing, the film comprises a heat mouldable base sheet with at least one anchoring sublayer and then a layer of silver halide grains in a polyvinyl acetal made with both benzaldehyde and an aldehyde substituted with a free carboxylic or sulphonic acid group or a water-soluble salt of such. In example 1 a film base sheet of vinyl chloride/acetate copolymer is subbed with an ethanol-acetone solution containing polyvinyl benzaldehyde/sodium o-sulphobenzaldehyde acetal (prepared by methods corresponding to those of Specification 535,341 using the mixed aldehydes) together with vinyl chloride/acetate/alcohol terpolymer and boric acid, dried, overcoated with a ripened dispersion prepared as by precipitating silver bromide into an aqueous alcoholic solution of a similar polyvinyl benzaldehyde/sodium o - sulphobenzaldehyde acetal, dried, and then provided with an antiabrasion layer also of this mixed acetal. After drying, the film, emulsion side down, is attracted to a plaster of paris contour mould of terrain in an open-sided vacuum box and subjected therein to a heat source as of 700‹ F. A negative image of objects on the terrain is then projected in register onto the cooled moulded film, and the latter processed using specified metal quinol and acid fixing solutions, to give a relief photograph free from blisters and cracking. In two further examples the same base sheet is subbed successively with the terpolymer of example 1 containing, or followed by treatment with, nitrocellulose solution, and then the polyvinyl benzaldehyde/sodium osulphobenzaldehyde acetal; after which the same ripened dispersion is applied and the resulting films are converted into moulded photographs similarly. Other heat-mouldable base sheets, including polystyrene, polyethylene, cellulose acetate or butyrate, and polyethylene terephthalate and other polyvinyl acetals for the light-sensitive layer, made as from benzaldehyde together with phthalaldehydic acid or propionaldehyde-#-sulphonic acid, or from the dimethyl, diethyl or ethylene glycol acetals of such aldehydes by acetal interchange, may be used. Specifications 600,039; 634,140, [Group IV (a)], and 641,368 also are referred to.
|
