EP0511969A1 - Products for colour photography, containing a layer of reflecting tabular grains - Google Patents

Products for colour photography, containing a layer of reflecting tabular grains

Info

Publication number
EP0511969A1
EP0511969A1 EP19910901468 EP91901468A EP0511969A1 EP 0511969 A1 EP0511969 A1 EP 0511969A1 EP 19910901468 EP19910901468 EP 19910901468 EP 91901468 A EP91901468 A EP 91901468A EP 0511969 A1 EP0511969 A1 EP 0511969A1
Authority
EP
European Patent Office
Prior art keywords
layer
grains
silver halide
layers
photographic product
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP19910901468
Other languages
German (de)
French (fr)
Inventor
Gérard Friour
Philippe Strauel
Albert Chambonnet
Christian Igier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kodak Pathe SA
Eastman Kodak Co
Original Assignee
Kodak Pathe SA
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kodak Pathe SA, Eastman Kodak Co filed Critical Kodak Pathe SA
Publication of EP0511969A1 publication Critical patent/EP0511969A1/en
Ceased legal-status Critical Current

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Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/3029Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function

Definitions

  • the present invention relates to products for color photography, and more particularly to reversible / color films and papers with improved sensitivity.
  • Products for color photography usually comprise three layers or three types of silver halide emulsion layers sensitive respectively to a separate third of the visible spectrum, ie blue, green and red. Because silver halides are inherently blue sensitive, the blue sensitive layer or layers are generally placed on the exposure side. Most of the blue light is thus absorbed. The rest of the blue light is absorbed by a filter layer absorbing the blue light which is generally placed between the layer or layers sensitive to blue and the layers sensitive to green and red, in order to avoid that the layers sensitive to green and red intrinsically sensitive to blue are not bothered by blue light. This part of the blue light absorbed by the filter was not used in the blue sensitive layer, which corresponds to a reduction in the sensitivity of the blue sensitive layer.
  • tabular silver halide grains are known.
  • United States patent 4,439,520 (Kofron) describes tabular grains having a thickness less than 0.5 ⁇ m, a diameter greater than 0.6 ⁇ m and an average shape index greater than 8/1, representing more than 50% of the total projected surface of the silver halide grains.
  • These tabular grains are used in products for color photography, as photosensitive grains forming developable latent image. They have the advantage of having a native sensitivity to blue light lower than that of non-tabular grains, which reduces the interference of blue light in the layers sensitive to green and red, and makes it possible to modify the order. layers on the support if desired.
  • the grains diffusing the light indicate grains diffusing the light in all the directions
  • grains reflecting the light indicate grains reflecting the light in the direction of the exposure.
  • the subject of the present invention is a product for color photography whose sensitivity to blue light is improved, without any adverse effect on the other properties of the photographic product.
  • the product according to the invention comprises, on a support, a layer or a set of layers sensitive to red light, associated with a coupler forming cyan dye, a layer or a set of layers sensitive to green light, associated with a magenta dye-forming coupler and a blue light-sensitive layer or set of layers associated with a yellow dye-forming coupler, and it is characterized in that it comprises, under one of the layers or under each blue-sensitive layer, an intermediate layer comprising gelatin and tabular silver halide grains whose intrinsic sensitivity is lower than the sensitivity of the photosensitive silver halide grains forming the image, by at least the value of the modulation interval of the D / Log E curve of said photosensitive grains, having an average thickness between 0.03 and 0.2 ⁇ m and a shape index of at least 2: 1, and preferably greater than 5: 1, at a rate of 2 to 10 mg
  • tabular silver halide grains are used having an average thickness of between 0.03 e * - 0.07 ⁇ m.
  • tabular grains of average thickness between 0.03 and 0.2 microns.
  • the reflective powers of these grains can be calculated, as indicated above.
  • the most selective grains for blue compared to the blue minus have an average thickness of about 0.15 ⁇ m. It is assumed that these grains are the most advantageous for reflecting only blue light towards the blue layer, while they are crossed by the lights of the blue minus which reach the underlying layers sensitive to green and red: in a product for color photography having a classic structure, the blue sensitive layer is the outermost with respect to the support and located on the side of the exhibition.
  • grains of 0.05 ⁇ m thickness which also have good reflection in blue, but which are not selective, are also useful, and do not significantly reduce the sensitivity to blue minus of underlying emulsions sensitized to green and red.
  • the grains of 0.05 ⁇ m thickness also have the advantage, compared to the grains of 0.15 ⁇ m thickness, of having better reflection for the same silver content on the layer. .
  • the reflection of the flat grains could be increased by 0.15 ⁇ m in thickness by increasing the silver content of the emulsion.
  • the grains having thicknesses of between 0.03 and 0.07 ⁇ m are however preferred since they allow the use of emulsions with lower silver titers, which is always advantageous, without however degrading the sensitometric properties of the layers.
  • the shape index of the tabular grains used in the intermediate layer according to the invention depends on their diameter, the thickness being defined. The smaller the diameter of the grains, the more the diffusion phenomenon which we want to overcome will appear. It is therefore advantageous to use tabular grains whose shape index is at least 2: 1, and preferably greater than 5: 1. These tabular grains can have any shape. For example they can be hexagonal, triangular, square, rectangular. The intrinsic sensitivity of these tabular grains is less than the sensitivity of the photosensitive silver halide grains forming the image, by at least the value of the modulation interval of the D / Log E curve of said photosensitive grains.
  • the modulation interval of the D / Log E curve (density as a function of the logarithm of exposure) of a photographic emulsion is the difference of the exposure values between the foot and the shoulder of the curve, or between the maximum density and the minimum density.
  • the tabular grains used as a sublayer in the invention must not be photosensitive in the modulation range of the photosensitive grains forming the image.
  • the intrinsic sensitivity of the tabular grains used in the present invention must be 2 log E less than the sensitivity of the grains forming the image.
  • the intrinsic sensitivity represents the sensitivity of the silver halide grains before any treatment such as the addition of sensitizing dyes, and in particular before formation of the haze, in the case where hazy grains are used.
  • any halide can be used for tabular grains.
  • the tabular grains have equivalent reflections for the same thickness whatever their composition.
  • the tabular grains of silver chloride have a lower intensity of reflection than those of silver bromide.
  • the bromoiodide grains With regard to the bromoiodide grains, the presence of iodide which is released during development, tends to inhibit the development of grains from the neighboring layers, and therefore to decrease the sensitivity, all the more so as the content of iodide in the tabular grains is higher.
  • tabular grains of silver bromide are preferred.
  • Tabular grains of thickness between 0.03 ⁇ m and 0.2 ⁇ m can be prepared by the preparation methods described in United States patent 4,439,520 (or its French correspondent 2,516,256).
  • Example 3 of Table VI of this patent gives a process for preparing tabular grains of 0.15 ⁇ m thick and 19: 1 shape index.
  • Table XI grains of 0.19 ⁇ m, 0.07 and 0.06 ⁇ m are found, with shape indices of 40: 1, 40: 1 and 27: 1, respectively.
  • Table XVIII emulsion 1 contains grains 0.10 ⁇ m thick, and with a shape index of 16: 1.
  • the silver titles of the intermediate layer of tabular grains according to the invention can vary from 2 to 10 mg / dm. It has indeed been shown that outside these limits the increases in sensitivity obtained, although present, are too small to be useful.
  • This layer is located, as indicated above, under one of the layers or under each layer of blue-sensitive emulsion of a color photographic product. Preferably, it is adjacent to a blue-sensitive layer. However, it can optionally be separated from it, for example by a layer of gelatin containing photographically useful adjuvants.
  • the intermediate layer of tabular grains may itself contain adjuvants such as those described in Research Disclosure, Vol 176, December 1978, Article 17643, Sections V and VI and IX to XII, and possibly photographically useful substances.
  • Color photographic products in which the intermediate layer of tabular grains according to the invention can be used are all products having the conventional structure in three layers or three sets of layers sensitive respectively to blue, green and red light, one of the layers sensitive to blue on the exposure side.
  • the photosensitive emulsions of the color photographic product of the invention can contain all kinds silver halide, such as chlorides, bromides, bromoiodides, chlorobromides, etc., as well as all forms of grains, such as coarse grains, fine grains, octahedral grains, heart grains and nuts, tabular grains, etc.
  • silver halide such as chlorides, bromides, bromoiodides, chlorobromides, etc.
  • grains such as coarse grains, fine grains, octahedral grains, heart grains and nuts, tabular grains, etc.
  • the reference cited above contains all that relates to the preparation of emulsions (sections I and II), chemical and spectral sensitizations (sections III and IV), adjuvants such as optical brightening agents (section V) , anti-stars and stabilizers (section VI), vehicles (section IX), tanning agents (section X), coating aids (section XI), plasticizers and lubricants (section XII).
  • the intermediate layer of tabular grains according to the invention can be applied with the other layers of the photographic product by any known coating process, such as those described in the Research Disclosure reference cited above, section XV, on supports such as those described in the same reference section XVII.
  • the support for the photographic product can be a transparent film or it can be reflective, such as paper.
  • the photographic product is an invertible product, that is to say it is treated in a first black and white developer to develop the silver halide in the exposed areas , veiled by exposure or chemically, then developed in a chromogenic developer to obtain, after money laundering, a positive color image of the original.
  • the tabular grains of the intermediate layer are previously veiled, so as to be developed in the first black and white development and not to interfere in the subsequent chromogenic development.
  • the tabular grains can be veiled by exposure or chemically, with any veiling agent known in the art. We can for example, use stannous chloride.
  • monolayer products comprising, on a paper support coated with polyethylene, in the order:
  • Another identical product, but not containing the intermediate layer, is prepared to serve as a control.
  • the two products are exposed under a density scale under the following conditions: 0.5 s, neutral density + 1.36, 2850 ° K, heat-resistant filter AC13, in status A. They are developed with a standard reversible treatment for Ektachrome paper R3, then we read them with a XRite densitometer.
  • the tabular silver bromide grains of the intermediate layer are those of Example 1 (0.05 ⁇ m thick) and they are veiled as in examples 1 to 4.
  • Another identical product, but not containing the intermediate layer of tabular grains, is prepared to serve as a control.
  • the two products are exposed and treated as indicated for the products of Examples 1 to 4.
  • This example shows that the intermediate layer of reflecting flat grains according to the invention has no unfavorable influence on the interimage effects in a photographic paper in invertible color.
  • Example 5 The product of Example 5 is taken up and each layer is exposed separately through filters, one of the layers being exposed on a sensitometric scale, and the other two uniformly at two exposure values. The product is then treated as in Examples 1 to 4.
  • Test I modulated exposure of the magenta and uniform layer of the yellow and cyan layers
  • Test II modulated exposure of the magenta and cyan layers and uniform of the yellow layer.
  • the interimage effect is expressed as the difference in density ⁇ D between the two extreme degrees of the scale sensitometric, for each product, in the yellow layer exposed uniformly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

La présente invention concerne un produit multicouches pour la photographie en couleur. Le produit comprend, sous une des couches ou sous chaque couche sensible au bleu, une couche intermédiaire comprenant des grains d'halogénure d'argent tabulaires non photosensibles ayant une épaisseur comprise entre 0,03 et 0,2 mum. Application à un produit pour la photographie en couleur dont la sensibilité est améliorée.The present invention relates to a multilayer product for color photography. The product comprises, under one of the layers or under each blue-sensitive layer, an intermediate layer comprising non-photosensitive tabular silver halide grains having a thickness of between 0.03 and 0.2 mm. Application to a product for color photography whose sensitivity is improved.

Description

PRODUITS POUR LA PHOTOGRAPHIE EN COULEURS CONTENANT UNE COUCHE DE GRAINS TABULAIRES REFLECHISSANTS La présente invention concerne des produits pour la photographie en couleurs, et plus particulièrement des films et des papiers couleur inversibles/ présentant une sensibilité améliorée. The present invention relates to products for color photography, and more particularly to reversible / color films and papers with improved sensitivity.
Les produits pour la photographie en couleurs comprennent habituellement trois couches ou trois types de couches d'émulsion aux halogénures d'argent sensibles respectivement à un tiers distinct du spectre visible, c'est-à-dire au bleu, au vert et au rouge. Du fait que les halogénures d'argent sont intrinsèquement sensibles au bleu, on place en général la couche ou les couches sensibles au bleu du côté de l'exposition. La plus grande partie de la lumière bleue est ainsi absorbée. Le reste de la lumière bleue est absorbé par une couche filtre absorbant la lumière bleue que l'on place généralement entre la couche ou les couches sensibles au bleu et les couches sensibles au vert et au rouge, afin d'éviter que les couches sensibles au vert et au rouge intrinsèquement sensibles au bleu ne soient gênées par la lumière bleue. Cette partie de la lumière bleue absorbée par le filtre n'a pas été utilisée dans la couche sensible au bleu, ce qui correspond à une diminution de la sensibilité de la couche sensible au bleu.Products for color photography usually comprise three layers or three types of silver halide emulsion layers sensitive respectively to a separate third of the visible spectrum, ie blue, green and red. Because silver halides are inherently blue sensitive, the blue sensitive layer or layers are generally placed on the exposure side. Most of the blue light is thus absorbed. The rest of the blue light is absorbed by a filter layer absorbing the blue light which is generally placed between the layer or layers sensitive to blue and the layers sensitive to green and red, in order to avoid that the layers sensitive to green and red intrinsically sensitive to blue are not bothered by blue light. This part of the blue light absorbed by the filter was not used in the blue sensitive layer, which corresponds to a reduction in the sensitivity of the blue sensitive layer.
Pour remédier à cet inconvénient, on a déjà proposé dans la technique antérieure d'utiliser dans la couche sensible au bleu ou dans une couche sous-jacente de fines particules diffusant la lumière telles que des particules de dioxyde de titane, d'oxyde de zinc, de sulfate de baryum ou une émulsion aux halogénures d'argent à grains très fins non photosensibles. Un tel procédé a été décrit dans "Research Disclosure" No 134 (1975) p. 47, item 13452. Ce procédé a cependant l'inconvénient d'augmenter la granularité et de diminuer la netteté. Le brevet des Etats-Unis d'Amérique 4 539 289 décrit une structure de couches qui permet d'éviter ces inconvénients, en plaçant la couche de particules diffusantes à des emplacements spécifiques dans la structure du produit photographique.To overcome this drawback, it has already been proposed in the prior art to use in the blue-sensitive layer or in an underlying layer of fine light-diffusing particles such as particles of titanium dioxide, zinc oxide , barium sulphate or a very fine grained, non-photosensitive silver halide emulsion. Such a process has been described in "Research Disclosure" No 134 (1975) p. 47, item 13452. However, this process has the disadvantage of increasing the granularity and reducing the sharpness. US Patent 4,539,289 describes a layer structure which overcomes these disadvantages by placing the layer of diffusing particles at specific locations in the structure of the photographic product.
D'autre part, on connaît des émulsions contenant des grains d'halogénure d'argent tabulaires. Ainsi, par exemple, le brevet des Etats-Unis d'Amérique 4 439 520 (Kofron) décrit des grains tabulaires ayant une épaisseur inférieure à 0,5 μm, un diamètre supérieur à 0,6 μm et un indice de forme moyen supérieur à 8/1, représentant plus de 50% de la surface totale projetée des grains d'halogénure d'argent. Ces grains tabulaires sont utilisés dans des produits pour la photographie en couleurs, en tant que grains photosensibles formateurs d'image latente développable. Ils présentent l'avantage d'avoir une sensibilité native à la lumière bleue inférieure à celle des grains non tabulaires, ce qui diminue l'interférence de la lumière bleue dans les couches sensibles au vert et au rouge, et permet de modifier l'ordre des couches sur le support si on le souhaite.On the other hand, emulsions containing tabular silver halide grains are known. Thus, for example, United States patent 4,439,520 (Kofron) describes tabular grains having a thickness less than 0.5 μm, a diameter greater than 0.6 μm and an average shape index greater than 8/1, representing more than 50% of the total projected surface of the silver halide grains. These tabular grains are used in products for color photography, as photosensitive grains forming developable latent image. They have the advantage of having a native sensitivity to blue light lower than that of non-tabular grains, which reduces the interference of blue light in the layers sensitive to green and red, and makes it possible to modify the order. layers on the support if desired.
Dans la présente demande les grains diffusant la lumière désignent des grains diffusant la lumière dans toutes les directions, et des grains réfléchissant la lumière désignent des grains réfléchissant la lumière dans la direction de l'exposition.In the present application the grains diffusing the light indicate grains diffusing the light in all the directions, and grains reflecting the light indicate grains reflecting the light in the direction of the exposure.
On sait prévoir par le calcul les caractéristiques optiques des grains tabulaires, en fonction de leur épaisseur. Ceci est décrit dans "Research Dislosure" Mai 1985, item 25330. La variation du pourcentage de lumière réfléchie par des grains d'halogénure d'argent tabulaires en fonction de la longueur d'onde et de l'épaisseur des grains est illustrée à la figure 1 de cette publication. Il s'agit cependant de courbes théoriques calculées ; il est mentionné d'autre part dans cette publication qu'une couche de grains tabulaires sous-jacente à la couche sensible au bleu et réfléchissant la lumière bleue diminue de façon sensible la netteté de l'image formée dans la couche sensible au bleu. II faut noter aussi que des couches de grains d'halogénure tabulaires pratiquement insensibles à la lumière, c'est-à-dire ne participant pas à l'image dans la structure d'un produit pour la photographie en couleurs, ne sont pas mentionnées dans la technique antérieure. Etant donné la complexité des interactions physiques et chimiques dans un produit photographique, il n'était pas possible de prévoir qu'une sous-couche de grains réfléchissants pouvait permettre d'obtenir une sensibilité améliorée de la couche jaune, sans les inconvénients des couches de grains diffusants de la technique antérieure.It is known to predict by calculation the optical characteristics of the tabular grains, as a function of their thickness. This is described in "Research Dislosure" May 1985, item 25330. The variation in the percentage of light reflected by tabular silver halide grains as a function of the wavelength and thickness of the grains is illustrated in Figure 1 of this publication. However, these are calculated theoretical curves; it is also mentioned in this publication that layer of tabular grains underlying the blue sensitive layer and reflecting blue light appreciably decreases the sharpness of the image formed in the blue sensitive layer. It should also be noted that layers of tabular halide grains practically insensitive to light, that is to say not participating in the image in the structure of a product for color photography, are not mentioned. in the prior art. Given the complexity of the physical and chemical interactions in a photographic product, it was not possible to foresee that an underlayer of reflective grains could make it possible to obtain an improved sensitivity of the yellow layer, without the disadvantages of the layers of diffusing grains of the prior art.
On pouvait penser aussi que les avantages obtenus sur la couche bleue seraient détruits par des effets défavorables sur les autres couches, tels qu'une diminution de sensibilité dans le minus bleu, ou des effets interimage défavorables.One could also think that the advantages obtained on the blue layer would be destroyed by unfavorable effects on the other layers, such as a reduction in sensitivity in the blue minus, or unfavorable interimage effects.
La présente invention a pour objet un produit pour la photographie en couleurs dont la sensibilité à la lumière bleue est améliorée, sans effet défavorable sur les autres propriétés du produit photographique. Le produit selon l'invention comprend, sur un support, une couche ou un ensemble de couches sensibles à la lumière rouge, associé à un coupleur formateur de colorant cyan, une couche ou un ensemble de couches sensible à la lumière verte, associé à un coupleur formateur de colorant magenta et une couche ou un ensemble de couches sensible à la lumière bleue associé à un coupleur formateur de colorant jaune, et il est caractérisé en ce qu'il comprend, sous une des couches ou sous chaque couche sensible au bleu, une couche intermédiaire comprenant de la gélatine et des grains d'halogénure d'argent tabulaires dont la sensibilité intrinsèque est inférieure à la sensibilité des grains d'halogénure d'argent photosensibles formant l'image, d'au moins la valeur de l'intervalle de modulation de la courbe D/Log E desdits grains photosensibles, ayant une épaisseur moyenne comprise entre 0,03 et 0,2 μm et un indice de forme d'au moins 2:1, et de préférence supérieur à 5:1, à raison de 2 à 10 mg/dm2, et de préférence de 3 à 5 mg/dm2. L'expression "ensemble de couches" dans la présente demande désigne des couches sensibles à la même partie du spectre visible et qui sont placées dans le produit de façon contiguë ou non contiguë.The subject of the present invention is a product for color photography whose sensitivity to blue light is improved, without any adverse effect on the other properties of the photographic product. The product according to the invention comprises, on a support, a layer or a set of layers sensitive to red light, associated with a coupler forming cyan dye, a layer or a set of layers sensitive to green light, associated with a magenta dye-forming coupler and a blue light-sensitive layer or set of layers associated with a yellow dye-forming coupler, and it is characterized in that it comprises, under one of the layers or under each blue-sensitive layer, an intermediate layer comprising gelatin and tabular silver halide grains whose intrinsic sensitivity is lower than the sensitivity of the photosensitive silver halide grains forming the image, by at least the value of the modulation interval of the D / Log E curve of said photosensitive grains, having an average thickness between 0.03 and 0.2 μm and a shape index of at least 2: 1, and preferably greater than 5: 1, at a rate of 2 to 10 mg / dm 2 , and preferably of 3 to 5 mg / dm 2 . The expression “set of layers” in the present application designates layers sensitive to the same part of the visible spectrum and which are placed in the product in a contiguous or non-contiguous manner.
Selon un mode de réalisation préféré, on utilise des grains tabulaires d'halogénure d'argent ayant une épaisseur moyenne comprise entre 0,03 e*- 0,07 μm.According to a preferred embodiment, tabular silver halide grains are used having an average thickness of between 0.03 e * - 0.07 μm.
On peut utiliser dans la couche intermédiaire de grains tabulaires selon l'invention des grains tabulaires d'épaisseur moyenne comprise entre 0,03 et 0,2 μm. Les pouvoirs réfléchissants de ces grains peuvent être calculés, comme indiqué ci-dessus. Les grains les plus sélectifs pour le bleu par rapport au minus bleu ont une épaisseur moyenne d'environ 0,15 μm. On suppose que ces grains sont les plus avantageux pour réfléchir uniquement la lumière bleue vers la couche bleue, tandis qu'ils sont traversés par les lumières du minus bleu qui atteignent les couches sous-jacentes sensibles au vert et au rouge : dans un produit pour la photographie en couleurs ayant une structure classique, la couche sensible au bleu est la plus externe par rapport au support et située du côté de l'exposition. On a observé cependant que des grains de 0,05 μm d'épaisseur, qui ont aussi une bonne réflexion dans le bleu, mais qui ne sont pas sélectifs, sont aussi utiles, et ne diminuent pas de façon significative la sensibilité au minus bleu des émulsions sous jacentes sensibilisées au vert et au rouge.Can be used in the intermediate layer of tabular grains according to the invention tabular grains of average thickness between 0.03 and 0.2 microns. The reflective powers of these grains can be calculated, as indicated above. The most selective grains for blue compared to the blue minus have an average thickness of about 0.15 μm. It is assumed that these grains are the most advantageous for reflecting only blue light towards the blue layer, while they are crossed by the lights of the blue minus which reach the underlying layers sensitive to green and red: in a product for color photography having a classic structure, the blue sensitive layer is the outermost with respect to the support and located on the side of the exhibition. However, it has been observed that grains of 0.05 μm thickness, which also have good reflection in blue, but which are not selective, are also useful, and do not significantly reduce the sensitivity to blue minus of underlying emulsions sensitized to green and red.
On a observé aussi que les grains de 0,05 μm d'épaisseur présentent en outre l'avantage, par rapport aux grains de 0,15 μm d'épaisseur, d'avoir une meilleure réflexion pour un même titre en argent sur la couche. On pourrait augmenter la réflexion des grains plats de 0,15 μm d'épaisseur en augmentant le titre en argent de l'émulsion. Ainsi, on peut utiliser des grains plats ayant des épaisseurs comprises entre 0,03 et 0,2 μm, le choix de l'épaisseur dépendant des résultats souhaités et du produit photographique dans lequel on utilise la couche de grains tabulaires de l'invention. Les grains ayant des épaisseurs comprises entre 0,03 et 0,07 μm sont cependant préférés puisqu'ils permettent d'utiliser des émulsions avec des titres en argent plus faibles, ce qui est toujours avantageux, sans pour autant dégrader les propriétés sensitométriques des couches sous-jacentes sensibles au vert et au rouge, contrairement à ce qu'on aurait pu prévoir. L'indice de forme des grains tabulaires utilisés dans la couche intermédiaire selon l'invention dépend de leur diamètre, l'épaisseur étant définie. Plus le diamètre des grains est petit, plus le phénomène de diffusion dont on veut s'affranchir, apparaîtra. Il est donc avantageux d'utiliser des grains tabulaires dont l'indice de forme est d'au moins 2:1, et de préférence supérieur à 5:1. Ces grains tabulaires peuvent présenter n'importe quelle forme. Par exemple ils peuvent être hexagonaux, triangulaires, carrés, rectangulaires. La sensibilité intrinsèque de ces grains tabulaires est inférieure à la sensibilité des grains d'halogénures d'argent photosensibles formant l'image, d'au moins la valeur de l'intervalle de modulation de la courbe D/Log E desdits grains photosensibles. L'intervalle de modulation de la courbe D/Log E (densité en fonction du logarithme de l'exposition) d'une émulsion photographique, est la différence des valeurs d'exposition entre le pied et l'épaule de la courbe, ou entre la densité maximum et la densité minimum. Les grains tabulaires utilisés en sous-couche dans l'invention ne doivent pas être photosensibles dans l'intervalle de modulation des grains photosensibles formant l'image. Par exemple, dans un papier photographique inversible en couleur, la sensibilité intrinsèque des grains tabulaires utilisés dans la présente invention doit être inférieure de 2 log E à la sensibilité des grains formant l'image. La sensibilité intrinsèque représente la sensibilité des grains d'halogénure d'argent avant tout traitement tel que l'addition de colorants sensibilisateurs, et en particulier avant formation du voile, dans le cas où l'on utilise des grains voilés.It has also been observed that the grains of 0.05 μm thickness also have the advantage, compared to the grains of 0.15 μm thickness, of having better reflection for the same silver content on the layer. . The reflection of the flat grains could be increased by 0.15 μm in thickness by increasing the silver content of the emulsion. Thus, it is possible to use flat grains having thicknesses of between 0.03 and 0.2 μm, the choice of thickness depending on the desired results and on the photographic product in which the layer of tabular grains of the invention is used. The grains having thicknesses of between 0.03 and 0.07 μm are however preferred since they allow the use of emulsions with lower silver titers, which is always advantageous, without however degrading the sensitometric properties of the layers. underlying sensitive to green and red, contrary to what might have been expected. The shape index of the tabular grains used in the intermediate layer according to the invention depends on their diameter, the thickness being defined. The smaller the diameter of the grains, the more the diffusion phenomenon which we want to overcome will appear. It is therefore advantageous to use tabular grains whose shape index is at least 2: 1, and preferably greater than 5: 1. These tabular grains can have any shape. For example they can be hexagonal, triangular, square, rectangular. The intrinsic sensitivity of these tabular grains is less than the sensitivity of the photosensitive silver halide grains forming the image, by at least the value of the modulation interval of the D / Log E curve of said photosensitive grains. The modulation interval of the D / Log E curve (density as a function of the logarithm of exposure) of a photographic emulsion, is the difference of the exposure values between the foot and the shoulder of the curve, or between the maximum density and the minimum density. The tabular grains used as a sublayer in the invention must not be photosensitive in the modulation range of the photosensitive grains forming the image. For example, in a color invertible photographic paper, the intrinsic sensitivity of the tabular grains used in the present invention must be 2 log E less than the sensitivity of the grains forming the image. The intrinsic sensitivity represents the sensitivity of the silver halide grains before any treatment such as the addition of sensitizing dyes, and in particular before formation of the haze, in the case where hazy grains are used.
On peut utiliser n'importe quel halogénure pour les grains tabulaires. Les grains tabulaires présentent des réflexions équivalentes pour la même épaisseur quelque soit leur composition. Cependant les grains tabulaires de chlorure d'argent présentent une intensité de réflexion moindre que ceux de bromure d'argent. En ce qui concerne les grains de bromoiodure, la présence de l'iodure qui est libéré au développement, a tendance à inhiber le développement des grains des couches voisines, et donc à diminuer la sensibilité, et ce d'autant plus que la teneur en iodure dans les grains tabulaires est plus élevée. Pratiquement, on préfère des grains tabulaires de bromure d'argent. On peut préparer des grains tabulaires d'épaisseur comprise entre 0,03 μm et 0,2 μm par les procédés de préparation décrits au brevet des Etats-Unis d'Amérique 4 439 520 (ou son correspondant français 2 516 256). Ainsi par exemple, l'exemple 3 du tableau VI de ce brevet donne un procédé de préparation de grains tabulaires de 0,15 μm d'épaisseur et d'indice de forme de 19:1. Au tableau XI, on trouvera des grains de 0,19 μm, 0,07 et 0,06 μm, ayant des indices de forme, respectivement, de 40:1, 40:1 et 27:1. Au tableau XVIII, l'émulsion 1 contient des grains de 0,10 μm d'épaisseur, et d'indice de forme 16:1.Any halide can be used for tabular grains. The tabular grains have equivalent reflections for the same thickness whatever their composition. However, the tabular grains of silver chloride have a lower intensity of reflection than those of silver bromide. With regard to the bromoiodide grains, the presence of iodide which is released during development, tends to inhibit the development of grains from the neighboring layers, and therefore to decrease the sensitivity, all the more so as the content of iodide in the tabular grains is higher. In practice, tabular grains of silver bromide are preferred. Tabular grains of thickness between 0.03 μm and 0.2 μm can be prepared by the preparation methods described in United States patent 4,439,520 (or its French correspondent 2,516,256). Thus, for example, Example 3 of Table VI of this patent gives a process for preparing tabular grains of 0.15 μm thick and 19: 1 shape index. In Table XI, grains of 0.19 μm, 0.07 and 0.06 μm are found, with shape indices of 40: 1, 40: 1 and 27: 1, respectively. In Table XVIII, emulsion 1 contains grains 0.10 μm thick, and with a shape index of 16: 1.
Les titres en argent de la couche intermédiaire de grains tabulaires selon l'invention peuvent varier de 2 à 10 mg/dm . On a montré en effet qu'en dehors de ces limites les augmentations de sensibilité obtenues, bien que présentes, sont trop faibles pour être utiles.The silver titles of the intermediate layer of tabular grains according to the invention can vary from 2 to 10 mg / dm. It has indeed been shown that outside these limits the increases in sensitivity obtained, although present, are too small to be useful.
Cette couche est située, comme on l'a indiqué précédemment, sous une des couches ou sous chaque couche d'émulsion sensible au bleu d'un produit photographique en couleurs. De préférence, elle est adjacente à une couche sensible au bleu. Mais éventuellement, elle peut en être séparée, par exemple par une couche de gélatine contenant des adjuvants photographiquement utiles.This layer is located, as indicated above, under one of the layers or under each layer of blue-sensitive emulsion of a color photographic product. Preferably, it is adjacent to a blue-sensitive layer. However, it can optionally be separated from it, for example by a layer of gelatin containing photographically useful adjuvants.
La couche intermédiaire de grains tabulaires peut elle-même contenir des adjuvants tels que ceux décrits dans Research Disclosure, Vol 176, Décembre 1978, Article 17643, Sections V et VI et IX à XII, et éventuellement des substances photographiquement utiles.The intermediate layer of tabular grains may itself contain adjuvants such as those described in Research Disclosure, Vol 176, December 1978, Article 17643, Sections V and VI and IX to XII, and possibly photographically useful substances.
Des produits photographiques en couleurs dans lesquels on peut utiliser la couche intermédiaire de grains tabulaires selon l'invention sont tous les produits ayant la structure classique en trois couches ou trois ensembles de couches sensibles respectivement à la lumière bleue, verte et rouge, une des couches sensible au bleu se trouvant du côté de l'exposition.Color photographic products in which the intermediate layer of tabular grains according to the invention can be used are all products having the conventional structure in three layers or three sets of layers sensitive respectively to blue, green and red light, one of the layers sensitive to blue on the exposure side.
De tels produits sont décrits par exemple dans la Revue "Research Disclosure", Vol. 176, décembre 1978, item 17643, Section VII, paragraphes C à G, I et J.Such products are described, for example, in the journal "Research Disclosure", Vol. 176, December 1978, item 17643, Section VII, paragraphs C to G, I and J.
Les émulsions photosensibles du produit photographique en couleurs de l'invention peuvent contenir toutes sortes d'halogénure d'argent, tels que des chlorures, des bromures, des bromoiodures, des chlorobromures, etc., ainsi que toutes formes de grains, tels que des gros grains, des grains fins, des grains octaédriques, des grains à coeur et à coque, des grains tabulaires, etc. On trouvera dans la référence citée ci-dessus tout ce qui concerne la préparation des émulsions (sections I et II), les sensibilisations chimiques et spectrales (sections III et IV), les adjuvants tels que les agents d'avivage optique (section V), les antivoiles et les stabilisants (section VI), les véhicules (section IX), les tannants (section X), les adjuvants de couchage (section XI), les plastifiants et les lubrifiants (section XII). On peut appliquer la couche intermédiaire de grains tabulaires selon l'invention avec les autres couches du produit photographique par tout procédé de couchage connu, tel que ceux décrits à la référence Research Disclosure citée ci-dessus, section XV, sur des supports tels que ceux décrits à la même référence section XVII. Le support du produit photographique peut être un film transparent ou il peut être réfléchissant, tel qu'un papier.The photosensitive emulsions of the color photographic product of the invention can contain all kinds silver halide, such as chlorides, bromides, bromoiodides, chlorobromides, etc., as well as all forms of grains, such as coarse grains, fine grains, octahedral grains, heart grains and nuts, tabular grains, etc. The reference cited above contains all that relates to the preparation of emulsions (sections I and II), chemical and spectral sensitizations (sections III and IV), adjuvants such as optical brightening agents (section V) , anti-stars and stabilizers (section VI), vehicles (section IX), tanning agents (section X), coating aids (section XI), plasticizers and lubricants (section XII). The intermediate layer of tabular grains according to the invention can be applied with the other layers of the photographic product by any known coating process, such as those described in the Research Disclosure reference cited above, section XV, on supports such as those described in the same reference section XVII. The support for the photographic product can be a transparent film or it can be reflective, such as paper.
Dans un mode préféré de réalisation de l'invention, le produit photographique est un produit inversible, c'est-à-dire qu'il est traité dans un premier révélateur noir et blanc pour développer l'halogénure d'argent dans les zones exposées, voilé par exposition ou chimiquement, puis développé dans un développateur chromogène pour obtenir, après blanchiment de l'argent, une image en couleurs positive de l'original. Dans ce cas, les grains tabulaires de la couche intermédiaire sont préalablement voilés, de façon à être développés dans le premier développement noir et blanc et ne pas interférer dans le développement chromogène ultérieur. On peut voiler les grains tabulaires par exposition ou chimiquement, avec tout agent voilant connu dans la technique. On peut utiliser par exemple, du chlorure stanneux.In a preferred embodiment of the invention, the photographic product is an invertible product, that is to say it is treated in a first black and white developer to develop the silver halide in the exposed areas , veiled by exposure or chemically, then developed in a chromogenic developer to obtain, after money laundering, a positive color image of the original. In this case, the tabular grains of the intermediate layer are previously veiled, so as to be developed in the first black and white development and not to interfere in the subsequent chromogenic development. The tabular grains can be veiled by exposure or chemically, with any veiling agent known in the art. We can for example, use stannous chloride.
Les exemples suivants illustrent l'invention : EXEMPLES 1 à 4The following examples illustrate the invention: EXAMPLES 1 to 4
Pour montrer l'effet de la couche intermédiaire de grains tabulaires sur la sensibilité d'une couche d'émulsion sensible au bleu, on prépare des produits monocouche comprenant, sur un support de papier enduit de polyéthylène, dans l'ordre :To show the effect of the intermediate layer of tabular grains on the sensitivity of an emulsion layer sensitive to blue, monolayer products are prepared comprising, on a paper support coated with polyethylene, in the order:
- une sous-couche contenant 1,7 mg/dm2 d'argent de Carey-Lea et 12 mg/dm de gélatine,- an undercoat containing 1.7 mg / dm 2 of Carey-Lea silver and 12 mg / dm of gelatin,
- une couche contenant une émulsion de bromure d'argent à grains tabulaires ayant des dimensions indiquées au tableau I ci-dessous, voilés avec une solution aqueuse de chlorure stanneux à raison de 1 g de SnCl /mole Ag,introduite à la refonte, à raison de 4 mg d'argent/dm , et 12 mg/dm2 de gélatine.a layer containing an emulsion of silver bromide with tabular grains having dimensions indicated in Table I below, veiled with an aqueous solution of stannous chloride in an amount of 1 g of SnCl / mole Ag, introduced in the recasting, to at the rate of 4 mg silver / dm, and 12 mg / dm 2 of gelatin.
- une couche contenant une émulsion au bromoiodure d'argent, à raison de 4,7 mg d'argent/dm2, sensibilisée spectralement au bleu, un coupleur formateur de colorant jaune, et 12 mg/dm2 de gélatine,a layer containing a silver bromoiodide emulsion, at a rate of 4.7 mg of silver / dm 2 , spectrally sensitized to blue, a coupler forming yellow dye, and 12 mg / dm 2 of gelatin,
- une surcouche contenant 8 mg/dm2 de gélatine.- an overlay containing 8 mg / dm 2 of gelatin.
TABLEAU I Exemples Diamètre moven Epaisseur 1 0,5 μm 0,05 μmTABLE I Examples Moven diameter Thickness 1 0.5 μm 0.05 μm
2 1,73 μm 0,10 μm2 1.73 μm 0.10 μm
3 1,60 μm 0,15 μm3 1.60 μm 0.15 μm
4 1,69 μm 0,20 μm4 1.69 μm 0.20 μm
On prépare un autre produit identique, mais ne contenant pas la couche intermédiaire, pour servir de témoin.Another identical product, but not containing the intermediate layer, is prepared to serve as a control.
On expose les deux produits sous une échelle de densité dans les conditions suivantes : 0,5 s, densité neutre + 1,36, 2850°K, filtre anticalorique AC13, en status A. On les développe avec un traitement standard inversible pour papier Ektachrome R3, puis on les lit avec un densitomètre XRite.The two products are exposed under a density scale under the following conditions: 0.5 s, neutral density + 1.36, 2850 ° K, heat-resistant filter AC13, in status A. They are developed with a standard reversible treatment for Ektachrome paper R3, then we read them with a XRite densitometer.
On détermine la différence entre la sensibilité du produit témoin et celles des produits selon l'invention. Cette différence est indiquée au tableau II suivant. TABLEAU IIThe difference between the sensitivity of the control product and that of the products according to the invention is determined. This difference is indicated in Table II below. TABLE II
Exemples Sensibilité relativeExamples Relative sensitivity
Témoin 100Witness 100
1 1231,123
2 115 3 1162,115 3,116
4 1094,109
EXEMPLE 5EXAMPLE 5
On prépare un produit pour la photographie en couleurs ayant la structure suivante : We prepare a product for color photography with the following structure:
Titre en Ag Titre en gélatine (mg/dm2) (mg/dm2)Title in Ag Title in gelatin (mg / dm 2 ) (mg / dm 2 )
Surcouche 8,00Overlay 8.00
Couche contenant un 10,6 composé anti-UVLayer containing 10.6 anti-UV compound
Couche contenant une 4,7 12 émulsion de bromoiodure d'argent sensibilisé au bleu et un coupleur formateur de colorant jauneLayer containing 4.7 12 silver bromoiodide emulsion sensitized to blue and a coupler forming yellow dye
Couche intermédiaire de 3,00 12 grains tabulaires de bromure d'argentIntermediate layer of 3.00 12 tabular grains of silver bromide
Couche contenant de 1,7 12 l'argent de Carey-LeaLayer containing 1.7 12 Carey-Lea Silver
Couche contenant une 3,95 17,6 émulsion de bromoiodure d'argent sensibilisé au vert et un coupleur formateur de colorant magentaLayer containing 3.95 17.6 green bromoiodide emulsion sensitized to green and a coupler forming magenta dye
Couche filtre contenant 1,5 de l'argent réduit (Gray-Gel)Filter layer containing 1.5 reduced silver (Gray-Gel)
Couche contenant une 3,00 13,00 émulsion de bromoiodure d'argent sensibilisé au rouge et un coupleur formateur de colorant cyanLayer containing 3.00 13.00 silver bromoiodide emulsion sensitized to red and a coupler forming cyan dye
Souscouche 25Underlay 25
PAPIER SUPPORTSUPPORT PAPER
Les grains tabulaires de bromure d'argent de la couche intermédiaire sont ceux de l'exemple 1 (0,05 μm d'épaisseur) et ils sont voilés comme aux exemples 1 à 4.The tabular silver bromide grains of the intermediate layer are those of Example 1 (0.05 μm thick) and they are veiled as in examples 1 to 4.
On prépare un autre produit identique, mais ne contenant pas la couche intermédiaire de grains tabulaires, pour servir de témoin. On expose et on traite les deux produits comme il a été indiqué pour les produits des exemples 1 à 4.Another identical product, but not containing the intermediate layer of tabular grains, is prepared to serve as a control. The two products are exposed and treated as indicated for the products of Examples 1 to 4.
Les sensibilités des deux produits sont données au tableau III suivant .The sensitivities of the two products are given in Table III below.
TABLEAU III Sensibilités dans le bleu dans le vert dans le rouge Témoin 89 91 76TABLE III Sensitivities in blue in green in red Witness 89 91 76
Exemple 5 109 98 79Example 5,109 98,79
On peut observer un gain important de sensibilité dans le bleu, sans effet défavorable important dans le vert ni dans le rouge. EXEMPLE 6We can observe a significant gain in sensitivity in blue, with no significant adverse effect in green or red. EXAMPLE 6
Cet exemple montre que la couche intermédiaire de grains plats réfléchissants selon l'invention n'a pas d'influence défavorable sur les effets interimage dans un papier photographique en couleur inversible.This example shows that the intermediate layer of reflecting flat grains according to the invention has no unfavorable influence on the interimage effects in a photographic paper in invertible color.
On reprend le produit de l'exemple 5 et on expose chaque couche séparément à travers des filtres, une des couches étant exposée sous une échelle sensitométrique, et les deux autres uniformément à deux valeurs d'exposition. Le produit est ensuite traité comme aux exemples 1 à 4.The product of Example 5 is taken up and each layer is exposed separately through filters, one of the layers being exposed on a sensitometric scale, and the other two uniformly at two exposure values. The product is then treated as in Examples 1 to 4.
On effectue deux essais sur un produit selon l'invention et sur un produit témoin ne contenant pas la couche intermédiaire de grains plats. Essai I : exposition modulée de la couche magenta et uniforme des couches jaune et cyan, Essai II : exposition modulée des couches magenta et cyan et uniforme de la couche jaune. On exprime l'effet interimage comme la différence de densité ΔD entre les deux degrés extrêmes de l'échelle sensitométrique, pour chaque produit, dans la couche jaune exposée uniformément.Two tests are carried out on a product according to the invention and on a control product not containing the intermediate layer of flat grains. Test I: modulated exposure of the magenta and uniform layer of the yellow and cyan layers, Test II: modulated exposure of the magenta and cyan layers and uniform of the yellow layer. The interimage effect is expressed as the difference in density ΔD between the two extreme degrees of the scale sensitometric, for each product, in the yellow layer exposed uniformly.
Les résultats sont rassemblés au tableau IV ci-dessous.The results are collated in Table IV below.
ΔD dans la couche jaune Exposition élevée Exposition basse Essai IΔD in the yellow layer High exposure Low exposure Test I
Témoin -0,31 -0,28Witness -0.31 -0.28
Exemple 6 -0,23 -0,24Example 6 -0.23 -0.24
Essai IITrial II
Témoin -0,27 -0,51Witness -0.27 -0.51
Exemple 6 -0,26 -0,36Example 6 -0.26 -0.36
Ce tableau montre que les effets interimage dans le produit selon l'invention sont équivalents ou meilleurs que dans le produit témoin. This table shows that the interimage effects in the product according to the invention are equivalent or better than in the control product.

Claims

REVENDICATIONS - Produit photographique pour la photographie en couleurCLAIMS - Photographic product for color photography
. comprenant, sur un support, une couche ou un ensemble de couches d'émulsion aux halogénures d'argent sensibles à la lumière rouge, associé à un coupleur formateur de colorant cyan, une couche ou un ensemble de couches d'émulsion aux halogénures d'argent sensibles à la lumière verte, associé à un coupleur formateur de colorant magenta et une couche ou un ensemble de couches d'émulsion aux halogénures d'argent sensibles à la lumière bleue associé à un coupleur formateur de colorant jaune, caractérisé en ce qu'il comprend, sous une des couches ou sous chaque couche sensible au bleu, une couche intermédiaire comprenant de la gélatine et des grains d'halogénure d'argent tabulaires dont la sensibilité intrinsèque est inférieure à la sensibilité des grains d"halogénures d'argent photosensibles formant l'image, d'au moins la valeur de l'intervalle de modulation de la courbe D/Log E desdits grains photosensibles, ayant une épaisseur moyenne comprise entre 0,03 et 0,2 μm et un indice de forme d'au moins 2:1, à raison de 2 à 10 mg/dm2. - Produit photographique selon la revendication 1, caractérisé en ce que l'indice de forme des grains d'halogénure d'argent tabulaire dans la couche intermédiaire est supérieure à 5:1. - Produit photographique selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que l'épaisseur des grains d'halogénure d'argent tabulaires dans la couche intermédiaire est comprise entre 0,03 et 0,07 μm. - Produit photographique selon l'une quelconque des revendications 1 à 3, dans lequel les grains d'halogénure d'argent tabulaires dans la couche intermédiaire sont des grains de bromure d'argent. 5 - Produit photographique selon l'une quelconque des revendications 1 à 4, dont le support est un support de film transparent. 6 - Produit photographique selon l'une quelconque des revendications 1 à 4, dont le support est réfléchissant.. comprising, on a support, a layer or a set of layers of emulsion with silver halides sensitive to red light, associated with a coupler forming cyan dye, a layer or a set of layers of emulsion with halides of silver sensitive to green light, associated with a magenta dye-forming coupler and a layer or a set of layers of silver halide emulsion sensitive to blue light associated with a yellow dye-forming coupler, characterized in that it comprises, under one of the layers or under each layer sensitive to blue, an intermediate layer comprising gelatin and tabular silver halide grains whose intrinsic sensitivity is lower than the sensitivity of the photosensitive silver halide grains forming the image, at least the value of the modulation interval of the D / Log E curve of said photosensitive grains, having an average thickness of between 0.03 and 0 , 2 μm and a shape index of at least 2: 1, at a rate of 2 to 10 mg / dm 2 . - Photographic product according to claim 1, characterized in that the shape index of the tabular silver halide grains in the intermediate layer is greater than 5: 1. - Photographic product according to any one of claims 1 or 2, characterized in that the thickness of the tabular silver halide grains in the intermediate layer is between 0.03 and 0.07 μm. - Photographic product according to any one of claims 1 to 3, in which the tabular silver halide grains in the layer intermediate are grains of silver bromide. 5 - Photographic product according to any one of claims 1 to 4, the support of which is a transparent film support. 6 - Photographic product according to any one of claims 1 to 4, the support of which is reflective.
7 - Produit photographique selon l'une quelconque des revendications 1 à 6, dans lequel le titre des grains d'halogénure d'argent tabulaires dans la couche intermédiaire est compris entre 3 et 5 mg/dm . - Produit photographique selon l'une des revendications7 - Photographic product according to any one of claims 1 to 6, wherein the titer of the tabular silver halide grains in the intermediate layer is between 3 and 5 mg / dm. - Photographic product according to one of claims
1 à 7, caractérisé en ce qu'il est traité selon un mode inversible et que les grains d'halogénure d'argent tabulaires de la couche intermédiaire sont préalablement voilés dans le produit photographique. 1 to 7, characterized in that it is treated in an invertible manner and that the tabular silver halide grains of the intermediate layer are previously veiled in the photographic product.
EP19910901468 1989-12-26 1990-12-14 Products for colour photography, containing a layer of reflecting tabular grains Ceased EP0511969A1 (en)

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FR8917514A FR2656434A1 (en) 1989-12-26 1989-12-26 PRODUCTS FOR COLOR PHOTOGRAPHY CONTAINING A LAYER OF REFLECTIVE TABULAR GRAIN.
FR8917514 1989-12-26

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GB9302860D0 (en) * 1993-02-12 1993-03-31 Kodak Ltd Photographic elements for producing blue,green and red exposure records of the same hue and methods for the retrival and differentiation of the exposure
EP0709731A3 (en) * 1994-10-25 1996-07-24 Agfa Gevaert Ag Color photographic silverhalide material
EP1041437A1 (en) * 1999-04-01 2000-10-04 Eastman Kodak Company Color photographic film exhibiting increased blue speed
US5998114A (en) * 1999-04-15 1999-12-07 Eastman Kodak Company Color photographic film exhibiting increased red speed and sharpness
US6001548A (en) * 1999-04-15 1999-12-14 Eastman Kodak Company Color photographic film with a plurality of grain populations in its red recording layer unit
EP1217432B1 (en) * 2000-12-14 2007-08-15 FUJIFILM Corporation Silver halide photographic light-sensitive material and method for processing the same

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US4772546A (en) * 1985-10-16 1988-09-20 Fuji Photo Film Co., Ltd. Silver halide photographic material with high interimage effects
JPS6299748A (en) * 1985-10-25 1987-05-09 Fuji Photo Film Co Ltd Silver halide photographic sensitive material
JPH0727180B2 (en) * 1986-12-26 1995-03-29 富士写真フイルム株式会社 Photosensitive silver halide emulsion and color photosensitive material using the same

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