GB524557A - Improvements in and relating to photographic materials and the processing thereof - Google Patents

Abstract

524,557. Colour development. KODAK, Ltd. (Eastman Kodak Co.). Oct. 26, 1938, No. 10274/40. Divided out of 524,500. Drawings to Specification. [Class 98 (ii)] [Also in Group IV] Photographic material has at least one silver halide emulsion containing a coupling component consisting of a silver salt of a heterocyclic compound having in the heterocyclic nucleus an imino group which is next to or next but one to a nitrogen atom in the nucleus having an unshared pair of electrons or is next to a thiocarbonyl or carbonyl group in the nucleus. The parent heterocyclic compound may be 1:2:3- triazole, 1:2:4-triazole, indazole, 2-mercapto-5- aminothiobiazole. thiohydantoin, ethylenethiourea, mercaptobenzinidazole, thiourazole, dihydroquinazoline, perimidine, imidazole, tetrazole, tetrazolone, 1:2:3-triazolin, pyrazoleanthrone, and thioisatin. Examples of coupling components are 5-benzoylacetaminoindazoindazole, 5-salicoylaminobenztriazole. 5-(ohydroxybenzoylamino)-indazole, 5-(2-cyanacetyl - 5 - sulphonamido - 2 - coumaronyl)- benztriazole, and 5-benzoylacetamionbenztriazole. The emulsion binder may be gelatin, cellulose ester, or natural or synthetic resin. A p-phenylenediamine derivative such as paminodiethylaniline is used as the developing agent. Three-layer material containing three different coupling component may be employed. A yellow filter comprising colloidal silver in gelatin may be arranged between the top and middle layers. The material may be developed directly to form a negative colour image or a positive image may be obtained by first developing in an ordinary black and white developer followed by colour development of the residual silver halide. The support may be transparent or opaque. The process may be applied to the production of picture or sound images or both on kinematograph film. Specification 503,752 is referred to. 5-Aminoindazole is prepared by reducing 5-nitroindazole by hydrogenation in the presence of finely divided nickel. 5-Aminobenztriazole is similarly prepared from 5-nitrobenztriazole. 5-Nitrobenztriazole is prepared by thereaction of sodium nitrate on a cold suspension of 4-nitro- 1:2-diaminobenzene in concentrated hydrochloric acid. 5-(o-Hydroxybenzoylamino)-indazole is prepared by the reaction of 5-aminoindazole with phenyl salicylate, and 5-(hydroxybenzoylamino)-benztriazole is prepared analogously. 5-Benzoylacetaminobenztriazole and 5-benzoylacetaminoindazole are prepared analogously using ethyl benzoylacetate. 5 - 2 (Cyanacetyl - 5 - sulphonamido - 2- coumaronyl) - benztriazole is prepared by reacting 5-aminobenztriazole with 2-cyanacetyl coumarone-5-sulphonyl chloride in acetic acid containing sodium acetate. 2 - Cyanacetylcoumerone - 5 - sulphonylchloride is prepared by the reaction of cyanacetylcoumarone with chlorsulphonic acid. The Provisional Specification also refers to additional parent compounds and to Specification 475,786.