DE1772192

• Main Authors: NITTEL, FRITZ., 5000 KOELN, DE, RECKZIEGEL, ERICH., 5090 LEVERKUSEN, DE
• Format: Patent
• Language: English
• Published: 17.03.1983
• Subjects: AUXILIARY PROCESSES IN PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS

1,222,753. Incorporation of additives into photographic layers. AGFA-GEVAERT A.G. April 11, 1969 [April 11, 1968], No.18726/69. Heading G2C. A process for the production of photographic layers which contain photographic additives incorporated therein in heterogeneous distribution which additives, in the form of a solution, are emulsified with the coating solution for the layer and the resulting mixture is applied on a support, wherein the additives are emulsified together with one or more compounds of the general formula:- in which R represents a substituted or unsubstituted alkyl or alkenyl group having 1 to 18 carbon atoms; R1 represents a hydrogen atom or a substituted or unsubstituted alkyl or alkenyl group having 1 to 18 carbon atoms, and Q represents an alkyl group or substituted alkyl group having 1 to 9 carbon atoms or one of the groups COX or CH 2 COX in which X represents (1) a hydrogen atom or a hydroxy or an alkoxy group; (2) the group O-alkylene-[O-alkylene] -O-alkyl in which n represents O or a number from 1 to 10; (3) a substituted or unsubstituted amino group; (4) a substituted or unsubstituted hydrazino group; (5) a hydroxylamino group, or (6) a group -O-CH(CH 3 )-CH 2 -N(Z)-Y in which Y represents the group -CH 2 -CH(CH 3 )-OCO-CH 2 -CH(R)-COOH wherein R has the above indicated meaning and Z represents CH 3 or has the same meaning as Y. Preferably 0À1 to 10 parts by weight of the compound of the formula defined above are used together with 1 part by weight of the additive which is to be emulsified. The compound defined above is preferably added together with the additive which is to be emulsified to the casting composition dissolved in an organic solvent which may be methylenedichloride or ethyl acetate. The compound defined above together with the additive which is to be emulsified, as an aqueous alkaline solution optionally with a wetting agent, may be added to the acidified casting composition. The compounds defined above, many examples of which are given, do not cause flattening of the gradation and reduction in colour density and substantially prevent the increase in viscosity which many colour couplers containing -COOH or -5O 3 H groups cause during digestion, and prevent diffusion of stabilizers to adjacent layer (see Example 13). The additives may be U.V absorbers or white toners as exemplified in Examples 10 to 12. The other examples relate to the incorporation of colour couplers into photographic layers.