Patent GB-390616-A (GB)
Title: Improvements in or relating to light-sensitive films
IPC: G03C7/46
Filed: 1932-02-26
Abstract: 390,616. Photographic sensitive materials; colour photography. KALLE & CO. AKT.-GES., 23, Rheinstrasse, Biebrich, Wiesbaden, Germany. Feb. 26, 1932, No. 5849. Convention date, Feb. 28, 1931. [Class 98 (ii).] A light-sensitive film for the production of multi-colour pictures is manufactured by coating a cellulose film, which is sensitized in the mass, with a solution of a colloid. The cellulose film, which may comprise cellulose esters or ethers, regenerated cellulose or cellulose hydrate, may be coated on one or both sides and may be sensitized by the addition of stable diazo compounds with or without azo coupling components, bleaching out dyestuffs, lightsensitive leuco compounds or basic or vat dyestuffs. The external colloid layers may also be sensitized, in which case it is desirable to interpose an inactinic layer between the sensitized support and the colloid layer. The multi-coloured pictures may be produced, ior example, by copying three uncoloured negative part pictures, or the corresponding positives obtained therefrom, upon the three-layer film. Alternatively, part pictures may be applied on one or both sides by any method, e.g. by the imbibition process or a diazotype printing process. In examples : (1) a cellulose ester film sensitized in the mass with the diazo borofluoride of p-aminomonoethyl-o-toluidine and phenol is coated on both sides with a silver halide emulsion, and after being exposed, developed, and bleached, the two external pictures are dyed red and blue respectively by the uvachrome method (cf. Specifications 147,005, 147,103, 163,336, and 163,337, [all in Class 98 (ii), Photographic processes &c.] ; the third picture is obtained in the support by exposure, through the blue picture, under the corresponding positive part picture, and developing with gaseous ammonia: (2) a cellulose ether film sensitized in the mass with the diazo compound of 1 : 2 : 4-aminonaphtholsulphonic acid and resorcin, and coated on both sides with sodium bichromate-gelatine emulsion is exposed on both sides under positive part pictures, and the third picture obtained in the support by exposing under the positive part picture corresponding to the red, and developing with ammonia ; the external pictures are finally dyed yellow and blue respectively : (3) a cellulose ester support sensitized with resorcin and the diazo compound of p-aminomonoethylo-toluidine is coated on one side with a gelatine emulsion of 1 : 8 : 2 : 4-aminonaphtholdisulphonic acid and the diazo compound of paminomonoethyl - o - toluidine ; by exposure under positive part pictures and development, a blue picture is obtained in the gelatine and an orange picture on the support ; an inactinic layer, e.g. one containing a di- or tri-phenyl methane dyestuff may advantageously be interposed between the two layers : (4) a cellulose ester film prepared as in example (1) is coated on both sides with pure gelatine and exposed under a positive part picture to obtain a yellow picture in the support ; external' red and blue pictures are produced by the imbibition process : (5) a regenerated cellulose film sensitized in the mass with a bleaching-out dyestuff, e.g. flavinduline, is coated on both sides with a cellulose ester lacquer, and is sensitized on one side by coating with a ferroprussiate gelatine preparation and on the other with a bichromate-gelatine emulsion ; blue and red pictures are obtained in the usual manner in the external layers and a yellow bleaching- out picture is produced on the support by exposure under a positive part picture, through the blue picture. The films may be used for the production of anaglyphs.