Patent GB-766895-A (GB)
Title: New light-sensitive compositions for use in the manufacture of colour photographic materials
Inventor: AMBLER ARNOLD EDWIN
IPC: G03C7/388
Filed: 1954-04-14
Abstract: 766,895. Colour photographic compositions. IMPERIAL CHEMICAL INDUSTRIES, Ltd. March 25, 1955 [April 14, 1954], No. 10967/54. Class 98(2) The light-sensitive materials of Specifications 718,404 and 750,201 comprising water-in-oil emulsions in which the dispersed phase is an aqueous gelatin or gelatin substitute silver halide emulsion which may contain a colour former and the continuous phase is a solution of a waterinsoluble water-permeable cellulose ether in an incompletely water - miscible solvent are modified by the use of colour formers of such distribution ratio that their concentration in water is at least nine times that in the solvent. Numerous colour formers stated to be suitable for the purpose are quoted. The compositions may be made up and coated on film base or paper with suitable subbing layers to produce multilayer materials of conventional or other layer sequence, but an example is directed more particularly to mixed-grain procedure first making the three necessary compositions by (1) stirring a blue sensitive gelatino-silver bromoiodide emulsion contaning the disodium salt of monosulphonated 3 -(p -methoxybenzoyl - acetylamino)- 4 - (N - methyl - N - octadecylamino), benzoic acid as yellow colour former into a benzene solution of ethyl cellulose, homogenizing in a colloid mill, dehydrating with anhydrous sodium sulphate and decanting the composition; (2) stirring and treating similarly a green sensitive gelatino chlorobromide emulsion containing the disodium salt of the disulphonic acid derivative of 1 - phenyl - 3 - n - octadecylamino - 5 - pyrazolene as magenta colour former; (3) repeating this using a red sensitized emulsion containing the disodium salt of 1<SP>1</SP> - hydroxy - 4<SP>1</SP> - sulpho - 2' - naphthoyl - 1 - amino - 2(N - methyl - N - octadecylamino) benzene - 5 - sulphonic acid as cyan colour former. These three compositions are mixed, coated on to gelatin-baryta-carrying paper, dried, and the layer produced is exposed to a continuous spectrum, colour developed, acid stopped, bleached and fixed by specified but normal solutions to show separate coloured bands in the layer. The three colour formers referred to above are made (1) by sulphonating the colour former obtained by heating ethyl p-methylbenzoyl-acetate with 3 - amino - 4 - (N - methyl - N - octadecylamino) - benzoic acid, (2) by heating 1 - phenyl - 3 - amino- 5 - pyrazolene with n - octadecylamine in 2 - ethoxyethanol soltion and disulphonating the 1 - phenyl - 3 - n - octadecylamino- 5 pyrazolene so obtained, (3) by reacting 1<SP>1</SP> - hydroxy - 2<SP>1</SP> - naphthoyl - 1 - amino - 2(N - methyl - N - octadecylamino) -benzene - 5 - sulphonic acid with chlorosulphonic acid in ethylene dichloride. The disodium salt of 1<SP>1</SP> - hydroxy - 4 - sulpho - 2' - naphthoyl - 4 - doedcyl benzylamide sulphonic acid may be used in place of the above mentioned cyan colour fromer. A list of water-sensitive plasticizers which may be used for the ethyl cellulose binder in the incompletely water-miscible solvents of the continuous phase of the composition is provided in the Specification but no such plasticizer is used in the example. The invention is not restricted to the use of ethyl cellulose as binder but other such binders are not referred to. Other " incompletely water-miscible solvents " than the benzene of the example are quoted. Specification 755,987 also is referred to.