Patent GB-565929-A (GB)
Title: Improvements in the production of coloured photographs
IPC: G03C1/815
Filed: 1943-03-20
Abstract: A colour photograph comprises a layer containing a dye image and unused colour coupler employed for forming the dye image and inseparably superimposed on such layer, an outermost non-sensitive layer which transmits not more than 30 per cent, preferably not more than 15 per cent, at and below 350 mm , and not less than 70 per cent at and above 450mm .  The light-fastness of the image dye is improved and deterioration due to decomposition of the coupler prevented.  The ultra-violet absorbing layer is preferably coated over the colour photograph after the dye image has been formed. The coupler may be contained in fine discrete particles as described in Specifications 524,154, 524,554, 524,555 and 541,589, [all in Group XX]. Ultra-violet absorbing substances specified are 3 : 31-dialkyloxacyanine halides, diacylaminostilbene derivatives (e.g. the disodium and the bis-dioctylamine salts of 4 : 41-diacetylaminostilbene - 2 : 21 - disulphonic acid and disodium 4 : 41-di-(m-aminobenzoyl)-aminostilbene-2 : 21-disulphonate), 1 : 11-dihydroxy - 6 : 61-dinaphthylamine 3 : 31-disulphonic acid, aesculin, p - hydroxybenzaldehyde, 3 - methoxy - 4 - hydroxybenzaldehyde, 2 : 4 - dihydroxybenzaldehyde, quinine, primuline, di-4-(p-aminobenzoyl)-aminodiphenylurea-2 : 21-disulphonic acid and disalicylbenzidide.  The ultra-violet absorbing coating (a) prepared from an aqueous solution of gelatin and disodium 4 : 41-diacetylaminostilbene-2 : 21-disulphonate; (b) from a composition obtained by dispersing a sodium hydroxide-ethyl alcohol solution of disalicylbenzidide in gelatin and neutralizing with citric acid; (c) from an ethyl alcohol solution of polyvinyl acetate containing the bis-dioctylamine salt of 4 : 41-diacetylaminostilbene 2 : 2-disulphonic acid; or (d) from an ethyl alcohol solution of ethyl cellulose containing n-butyl propionate and the bis-dioctylamine salt of 4 : 41 - diacetylaminostilbene - 2 : 21-disulphonic acid.  In an example, exposed, colour developed, fixed, washed and dried material comprising a support coated with a light-sensitive layer made according to example (2) of Specification 541,589, [Group XX], (except that the emulsion is red-sensitive) and a light-sensitive layer made according to example (4) of Specification 541,589, [Group XX], (except that the emulsion is green - sensitive and the coupler is 2-cyanacetylcoumarone - 5 - sulphon - N - (n-amyltert-amylsulphanilide) is coated with one of the coatings specified.  Other couplers specified are 5-diamylnaphthalenesulphonamido-1-naphthol, 5 - [N - (p - toluenesulphonyl)] - (N1 - b  - hydroxy - ethyl) - amino - 1 - naphthol, 5-diphenylethersulphonamido-1-naphthol, 5-phenoxyacetamino-1-naphthol, 5 - (N - benzoyl - N - b  - hydroxyethyl) - amino - 1 - naphthol, 5 - amyldiphenylethersul - phonamido - 1 - naphthol, 2 : 4 - dichloro - 4 - (p - nitrobenzoyl-b -hydroxyethylamino) - 1 - naphthol, 5-(p-amylphenoxybenzenesulphonamido)-1-naphthol, 5-(N-benzyl-N-n-valerylamino)-1-naphthol, 5-caproylamino - 1 - naphthol, 2-chloro-5-(N - n - valeryl: N - p - isopropylbenzylamino) - 1 - naphthol, 2 : 4 - dichloro - 5 - palmitylamino - 1 - naphthol, 5-b -phenylpropionylamino-1-naphthol, and monochlor-5-(N-g -phenylpropyl-n-p-sec-amylbenzoylamino) -1-naphthol for cyan and 2-cyanacetylcoumarone-5-sulphon-N-methylanilide, 2 - cyanacetylcourmarone - 5 - sulphon - dimethylamide, 2-cyanacetyl-5-benzoylaminocoumarone, 2-cyanacetyl-5-(p-sec-amylbenzoylamino)-coumarone, 2-cyanacetylcoumarone-N-n-amyl: p-sec-amylsulphanilide, 2-cyanacetylcoumarone - 5 - sulphon - N - n - butylanilide, and 2-cyanacetylcoumarone-5-(N-g -phenylpropyl)-p-tert amylsulphonanilide for magenta.  Disodium - 4 : 41 - diacetylaminostilbene - 2 : 21-disulphonate is prepared by dissolving 4 : 41-diaminostilbene - 2 : 21 - disulphonic acid in aqueous sodium carbonate solution reacting with acetic anhydride, adding further sodium carbonate solution and recrystallising the precipitate.  The bis-dioctylamine salt is prepared by adding to an aqueous solution of the disodium salt a solution of dioctylamine in glacial acetic acid, ethyl alcohol, and water.  1 : 11-Dihydroxy-6 : 61-dinaphthylamine-3 : 31-disulphonic acid is prepared by adding aqueous sodium bisulphite to a caustic soda solution of J-acid.  Specifications 493,308, 501,190, 524,320, 524,377, 524,379 and 555,508, [Group XX], also are referred to.