Patent GB-465823-A (GB)
Title: Improved manufacture of photographic silver halide emulsions
IPC: G03C7/32
Filed: 1935-08-12
Abstract: 465,823. Colour photography. GROVES, W. W. (I. G. Farbenindustrie Akt.-Ges.) Aug. 12, 1935, No. 22676. [Class 98 (ii)] A dyestuff component or former containing a substituent comprising an aliphatic carbon chain of more than 5 carbon atoms is incorporated in a silver halide emulsion layer for colour photography, particularly colour development. The dyestuff component may be formed from phenols, naphthols, aminonaphthols, aniline, naphthylamines, acetoacetic acid ester, cyanoacetic acid ester, benzoylacetic acid ester, benzoylacetonitrile, hydrindene, pyrazolones, coumararone and oxythionaphthenes. The carbon chain may be unsaturated, and the dyestuff component may contain, either in the chain, or elsewhere, a sulphonic acid group to impart water-solubility. A dyestuff component containing an amino-group may be substituted by an aliphatic acid residue containing more than 5 carbon atoms, or a component containing an acid group may be combined with an aliphatic amine containing a carbon chain of more than 5 carbon atoms. Emulsion layers containing the components may be arranged on one or both sides of a support, and filter layers may be arranged between the emulsion layers or filter dyestuffs in the emulsions. The emulsion layers may be colour sensitized, and an anti-halation layer may be provided. Dyestuff components specified are (1) 1-(p-stearyl-aminophenyl)- 3-methyl-5-pyrazolone, (2) 1-(m-oleoylaminophenyl)-3-methyl-5-pyrazolone, (3) decyl-1-oxy- 2-naphthoylamine, (4) decanoylaminoacetic acid p-anisidide, (5) p-laurylaminobenzoylacetanilide (6) m - stearyl - aminobenzoylacetanilide - p<1>- carboxylic acid, (7) l-(3<1>-sulphophenyl)-3-(4<11>- stearylarninophenyl) - 5 - pyrazolone, (8) 1- (51 - sulpho - 3<1> - stearylaminophenyl) - 3- methyl-5-pyrazolone, (9) sodium 1-N-stearyl- 4-N-( 1<1>-oxy-2<1>-naphthoyl) - phenylene diaminesulphonate, (10) the sulphonation product of oleyl aminophenyhnethylpyrazolone, (11) the sulphonation product of oleyl-alpha-oxynaphthoyl amine, (12) the sulphonation production (with sodium sulphite) of alpha-bromostearyl-p-aminobenzoylacetanilide, and (13) 5-caprylamino-1 naphthol. The components are dissolved in methanol and aqueous caustic soda. A multilayer film comprises a support, a panchromatic emulsion layer containing 10 grams of component (3) per kilo, an orthochromatic emulsion layer containing 10 grams of 1-(m-stearylaminophenyl) - 3 - methyl - 5 - pyrazolone per kilo, an intermediate layer containing a decolourable yellow dyestuff, and a non-colour-sensitized emulsion layer containing 10 grams of component (4) per kilo. The film is developed with p-dialkylaminoaniline. Emulsion layers containing components (5) or (6) give a yellow picture on development with p-diethylaminoaniline ; component (7) a blueish-red picture ; component (8) a yellowish-red picture ; components (9) and (10) blue and red pictures respectively with p-dimethylaminoaniline ; and components (11) and (12) blue and yellow pictures respectively on development with 1 p-dialkylaminoaniline. The Provisional Specification describes also a multi-layer film containing, in place of component (3) above, octodecyl-1-oxy-2-naphthoylamine. Developers referred to are pphenylenediamine, p-dimethylaminoaniline and ethoxy-p-dimethylaminoaniline. Specifications 15055 /12 and 2562/13, [both in Class 98 (ii)], are referred to.