Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/3003—Materials characterised by the use of combinations of photographic compounds known as such, or by a particular location in the photographic element
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/3029—Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function
  • G03C2007/3034—Unit layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/305—Substances liberating photographically active agents, e.g. development-inhibiting releasing couplers
  • G03C7/30541—Substances liberating photographically active agents, e.g. development-inhibiting releasing couplers characterised by the released group
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/156—Precursor compound
  • Y10S430/158—Development inhibitor releaser, DIR

Definitions

• the invention relates to a color photographic negative recording material with at least one color coupler-containing photosensitive silver halide emulsion layer for each of the spectral ranges blue, green, red, for at least one of the spectral ranges blue, green, red a silver halide and color coupler consisting of several partial layers and in at least one of the laminates contains a DIR connection.
• DIR development inhibitor releasing
• IIE inter-image effect
• the IIE (TH James, The Theory of the Photographic Process, 4th edition, Mc Millan Co. NY (1977) pp. 574 and 614) is measured as a percentage distribution of the color gradation with color separation exposure with light of the corresponding spectral range in relation to that color gradation , which arises when exposed to white light.
• DIR couplers consist in the improved color granularity and in the improved sharpness due to high so-called edge effects (literature: CR Barr, JR Thistle, PW Vittum: “Development-Inhibitor-Releasing (DIR) Couplers in Color Photography", Phot. Sci. Eng. 13 , 74, 214 (1969)).
• Modern color photographic recording materials also generally contain not only a silver halide layer for each of the spectral ranges blue, green, red, but several sub-layers that are separate differ in their sensitivity (e.g. DE-C-1 121 470).
• Such partial layers of the same spectral sensitivity can each be arranged adjacent to one another in the layer structure in the form of double or multiple layer packages;
• layer structures are also known where individual partial layers (each separated from one another by separating or filter layers) are arranged alternately (for example DE-A-1 958 709, DE-A-25 30 645; DE-A-26 22 922).
• DE-A-31 13 003 describes a photographic recording material with a laminate consisting of several sub-layers, in which a comparatively more sensitive silver halide emulsion (sub) layer is enclosed between comparatively less sensitive sub-layers containing color couplers. DIR couplers can be present in both the more sensitive and the less sensitive sub-layers. This material is said to achieve improved sharpness and graininess with higher sensitivity.
• DIR couplers can be contained in one or more silver halide emulsion layers of a color photographic recording material, depending on the intended use.
• at least one blue-sensitive, one green-sensitive and one red-sensitive layer each contain a suitable DIR coupler, and if there are several sub-layers of different sensitivity for one or more of the spectral ranges blue, green, red, the DIR coupler is expediently at least in one less sensitive sub-layer of a multi-layer system has essentially the same spectral sensitivity.
• DIR-couplers which are able to release an inhibitor with a high diffusibility
• diffusive development inhibitor-releasing compound can also be used in such a way that their amount is greatest in a less sensitive partial layer (EP-A-0 318 992) .
• DIR couplers which release inhibitors with the greatest possible inhibition strength during development.
• the aim of the invention is to provide a color photographic negative recording material which, with a given photosensitivity and a given exposure latitude, has the least possible granularity and the highest possible interimage effects with as little silver halide application per m2 as possible.
• the present invention has for its object to provide a color negative photographic material in which the silver halide can be reduced without loss of light sensitivity, exposure latitude or interimage effects or deterioration in color grain.
• the invention relates to a color photographic negative recording material with at least one color-coupler-containing light-sensitive silver halide emulsion layer for each of the spectral ranges blue, green, red, which contains a silver halide and color coupler consisting of several sub-layers for at least one of the spectral ranges blue, green, red at least one middle sub-layer B and sub-layers A, A ', A' ', A' '', ; .
• the middle sub-layer B having a sensitivity which is at least 3 DIN higher than that of each of the sub-layers A, A ', A' ', A' '', ..., characterized in that the sub-layer B contains a DIR compound which is able to release an inhibitor with a diffusibility of not less than 0.4.
• spectral ranges blue, green, red there is a laminate consisting of several sub-layers.
• These laminates have, for example, one of the following structures:
• sub-layer B there may also be further partial layers (A, A '%) of a comparatively lower sensitivity.
• the comparatively more sensitive sub-layer B can itself be subdivided into further sub-layers.
• the difference in light sensitivity between sub-layer B and each of sub-layers A, A ', A' ', A' '', .... is at least 3 DIN, preferably at least 5 DIN.
• the partial layers A, A ', A' ', A' '' ... can contain light-sensitive silver halide; however, the type and composition of the silver halide can differ from one another.
• the recording material according to the invention also contains, in at least one comparatively more sensitive sub-layer B, a DIR compound which during development can release an inhibitor with a diffusibility D f of not less than 0.4.
• Diffusibility D f is determined and defined for the purposes of the present invention using the following method: Multilayer test materials A and B were made as follows:
• test material B was also produced in the same way, but with the change compared to test material A that layer 2 is composed 0.346 g white coupler and 0.900 g gelatin.
• test materials A and B are exposed in a dark room under room lighting with a 100 watt incandescent lamp at a distance of 1.5 m and an exposure time of 15 min.
• Modified developers containing the development inhibitor to be tested are prepared in such a way that a 0.02 molar solution of the inhibitor in a methanol / water mixture (8: 2), which, if necessary, NaOH up to a pH of 9 contains, the developer is added and a 20% by volume diluted developer results by adding water.
• Test materials A and B are each developed in the (modified) developer containing the inhibitor and in the developer not containing the inhibitor and processed in the further steps.
• the resulting blue green densities are measured with a densitometer.
• the diffusibility D f is given below for a large number of inhibitors.
• the inhibitors are used in the layers of the color photographic recording material in the form of so-called DIR compounds, from which they are released imagewise during development in accordance with a previous exposure and then, if appropriate, develop their inhibiting effect after diffusion into other layers.
• the DIR compounds are essentially coupling compounds, ie compounds which are able to enter into a coupling reaction with the oxidation products of the color developer used. As a result of this coupling reaction, the inhibitor residue is then released set.
• the term DIR compound was chosen to clarify that the invention is not limited to the use of color coupling DIR couplers, but also includes those compounds which release inhibitor on reaction with the color developer oxidation products without at the same time contributing significantly to the development of a color image . Nevertheless, the use of DIR couplers is preferred.
• the DIR compounds are very reactive, i.e. have a high reaction rate when reacting with developer oxidation products.
• DIR compounds preferred according to the invention have a reactivity k of greater than 5000 1 ⁇ mol ⁇ 1 ⁇ s ⁇ 1, examples of suitable DIR compounds are listed below.
• the sub-layer B of a laminate according to the invention as well as one, more or all of the sub-layers A, A ', A'',A''' ... can also contain further DIR compounds, the diffusibility D f of the inhibitors released therefrom each may also be less than 0.4 depending on the application.
• DIR couplers the development inhibitors of the azole type, e.g. Release triazoles and benzotriazoles are described in DE-A-24 14 006, 26 10 546, 26 59 417, 27 54 281.28 42 063, 36 26 219, 36 30 564, 36 36 824, 36 44 416.
• Other advantages for color rendering, i.e. Color separation and color purity, and for detail reproduction, i.e. Sharpness and graininess can be achieved with such DIR couplers, which e.g. do not split off the development inhibitor directly as a result of the coupling with an oxidized color developer, but only after a further subsequent reaction, which is achieved, for example, with a timing group.
• DIR couplers which release a development inhibitor which is decomposed into essentially photographically ineffective products in the developer bath are described, for example, in DE-A-32 09 486 and in EP-A-0 167 168 and 0 219 713. This measure ensures trouble-free development and processing consistency.
• suitable measures for optical sensitization can be used to improve the color rendering, e.g. achieve a more differentiated color rendering, as described, for example, in EP-A-0 115 304, 0 167 173, GB-A-2 165 058, DE-A-37 00 419 and US-A-4 707 436.
• a polymer coupler or latex coupler instead of a low molecular weight color coupler is present as a color coupler in at least one of the sub-layers A, A ', A' ', A' ''.
• Sub-layer B can also contain such polymer couplers or latex couplers.
• High molecular weight color couplers are described, for example, in DE-C-1 297 417, DE-A-24 07 569, DE-A-31 48 125, DE-A-32 17 200, DE-A-33 20 079, DE-A-33 24 932, DE-A-33 31 743, DE-A-33 40 376, EP-A-27 284, US-A-4 080 211, EP-A-0 341 089, US-A-4 612 278, US-A-4 578 346.
• the high molecular weight color couplers are usually produced by polymerizing ethylenically unsaturated monomeric color couplers. However, they can also be obtained by polyaddition or polycondensation.
• the polymer couplers are in the form of latices (latex couplers) and can be directly mixed in this form with the casting solutions for the photographic layers.
• loaded latices in which latices are loaded with color couplers, are also suitable for the layer structures according to the invention.
• Such loaded latices are described for example in: DE-OS 2 541 274, DE-A-2 835 856, DE-A-2 820 092, DE-A-2 541 230, DE-A-2 815 635, US-A-4 199 363, US-A -4,388,403, EP-A-0 069 671, EP-A-0 014 021.
• comparatively thin layers of low binder (A, A ', A'',A''' 7) can be produced, which has an advantageous effect in terms of a smaller thickness of the entire layer structure.
• one, several or all of the sub-layers A, A ', A'',A''' .... of a laminate can be completely free of silver halide.
• the ratio of coupler to silver halide (in equivalents) for the partial layers A, A ', A'',A''' Vietnamese is generally greater than 0.2 and thus greater than the relevant ratio for the partial layer B .
• the recording material preferably has a total silver halide application of less than 8.0 g AgNO3 / m2.
• Another advantage is that the intermediate layers or separating layers that are usually present between laminates of different spectral sensitivity can also be dispensed with without impairing the color separation.
• the silver halide present as a light-sensitive component in the photographic material can contain chloride, bromide or iodide or mixtures thereof as the halide.
• the halide portion of at least one layer can contain 0 to 15 mol% of iodide and 0 to 100 mol% of chloride and consist of 0 to 100 mol% of bromide.
• Silver bromide or silver bromide iodide emulsions are usually used, optionally with a small proportion of silver chloride.
• the crystals can be predominantly compact, which are, for example, regularly cubic or octahedral or can have transitional forms.
• T-grains platelet-shaped crystals
• the average ratio of diameter to thickness (aspect ratio) of which is preferred is at least 5: 1, the diameter of a grain being defined as the diameter of a circle with a circle content corresponding to the projected area of the grain.
• the layers can also have tabular silver halide crystals in which the ratio of diameter to thickness is substantially greater than 5: 1, for example 12: 1 to 30: 1.
• at least one of the sub-layers A, A ', A'',A''' ... and / or the sub-layer B contains a silver halide T-grain emulsion with an aspect ratio of not less than 7: 1.
• T-grain emulsions are described, for example, in DE-A-32 41 635, DE-A-32 41 647 and US-A-4 952 491.
• the silver halide grains of at least one of the above-mentioned partial layers can preferably also have a multi-layered grain structure, in the simplest case with an inner and an outer grain area (core / shell), the halide composition and / or other modifications, such as, for example. Doping of the individual grain areas are different, the average grain size of the emulsions is preferably between 0.2 ⁇ m and 2.0 ⁇ m, the grain size distribution can be both homodisperse and heterodisperse, homodisperse grain size distribution means that 95% of the grains do not exceed ⁇ 30 % deviate from the average grain size.
• the emulsions can also contain organic silver salts, e.g. Silver benzotriazolate or silver behenate.
• Two or more kinds of silver halide emulsions, which are prepared separately, can be used as a mixture.
• Gelatin is preferably used as a binder for the photographic layers. However, this can be replaced in whole or in part by other natural or synthetic binders.
• the emulsions can be chemically and / or spectrally sensitized in the usual way, and the emulsion layers as well as other non-light-sensitive layers can be hardened in the usual way with known hardening agents.
• Color photographic recording materials usually contain at least one silver halide emulsion layer each for recording light from the three spectral ranges blue, green and red.
• the light-sensitive layers are spectrally sensitized in a known manner by means of suitable sensitizing dyes.
• Blue-sensitive silver halide emulsion layers do not necessarily have to contain a spectral sensitizer, since in many cases the intrinsic sensitivity of the silver halide (e.g. silver bromide) is sufficient for the recording of blue light.
• At least one of the silver halide emulsion layers is in the form of a laminate consisting of partial layers A, A ', A'',A''', ... B.
• Such a laminate is preferably present for each of the spectral ranges blue, green, red.
• a layer which is not sensitive to light is generally arranged between layers of different spectral sensitivity and can contain means for preventing the incorrect diffusion of developer oxidation products. If there are several silver halide emulsion layers of the same spectral sensitivity, these can be immediately adjacent to one another or arranged in such a way that a light-sensitive layer with a different spectral sensitivity is located between them (DE-A-1 958 709, DE-A-2 530 645, DE-A -2 622 922).
• Each of these laminates contains, in spatial and spectral association with the light-sensitive silver halide contained therein, one or more color couplers for producing the partial color image yellow, magenta or cyan which is complementary to the spectral sensitivity.
• Color coupler is in such a spatial relationship to the silver halide of the same laminate that an interaction between them is possible that creates an image-like correspondence between the silver image formed during development and that produced from the color coupler Color picture allows. This is usually achieved by the fact that the color coupler is contained in the silver halide emulsion layer itself or in a possibly non-light-sensitive binder layer adjacent to it.
• Spectral assignment is understood to mean that the spectral sensitivity of each of the light-sensitive silver halide emulsion layers and the color of the partial color image generated from the spatially assigned color coupler are complementary to one another.
• Each of the different spectrally sensitized laminates can contain one or more color couplers. If there are several silver halide emulsion layers of the same spectral sensitivity, each of them can contain a color coupler, which color couplers need not necessarily be identical. They should only result in at least approximately the same color during color development.
• Cyan couplers of the formula I are described, for example, in EP-A-0 161 626. Cyan couplers of the formula II are described, for example, in EP-A-0 067 689 and DE-A-39 33 899.
• Magenta couplers of this type are described for example in US-A-3 725 067 and US-A-4 540 654.
• Color couplers for producing the yellow partial color image are generally couplers with an open-chain ketomethylene group, in particular couplers of the ⁇ -acylacetamide type; Suitable examples are ⁇ -benzoylacetanilide couplers and ⁇ -pivaloylacetanilide couplers, preferably those that are bound to polymers.
• the color couplers can be 4-equivalent couplers, but also 2-equivalent couplers.
• the latter are derived from the 4-equivalent couplers in that they contain a substituent in the coupling site which is split off during the coupling.
• the 2-equivalent couplers include those that are colorless, as well as those that have an intense intrinsic color that disappears when the color is coupled or is replaced by the color of the image dye produced (mask coupler).
• the 2-equivalent couplers are also those couplers which contain a cleavable residue in the coupling site, which is released upon reaction with color developer oxidation products and which either directly or after one or more further groups have been cleaved from the primarily cleaved residue (e.g. DE-A-27 03 145, DE-A-28 55 697, DE-A-31 05 026, DE-A-33 19 428), a certain desired photographic effectiveness unfolds.
• the color photographic recording material of the present invention can contain further additives, for example antioxidants, dye-stabilizing agents and agents for influencing the mechanical and electrostatic properties.
• antioxidants for example antioxidants, dye-stabilizing agents and agents for influencing the mechanical and electrostatic properties.
• dye-stabilizing agents for influencing the mechanical and electrostatic properties.
• UV-absorbing compounds for example UV absorbers.
• hydrophilic film-forming agents are suitable as protective colloid or binder for the layers of the recording material, e.g. Proteins, especially gelatin. Casting aids and plasticizers can be used. Reference is made to the compounds specified in Research Disclosure No. 17,643 in Sections IX, XI and XII.
• the layers of the photographic material can be hardened in the usual manner, for example with hardeners of the epoxy type, the heterocyclic ethylene imine and the acryloyl type. Furthermore, it is also possible to harden the layers according to the process of DE-A-22 18 009 in order to obtain color photographic materials which are suitable for high-temperature processing. It is also possible to harden the photographic layers with hardeners of the diazine, triazine or 1,2-dihydroquinoline series or with hardeners of the vinyl sulfone type. Further suitable hardening agents are known from DE-A-24 39 551, DE-A-22 25 230, DE-A-23 17 672 and from Research Disclosure 17 643, Section XI given above.
• the color photographic recording material according to the invention is developed with a color developer compound.
• All developer compounds which have the ability to react in the form of their oxidation product with color couplers to form azomethine dyes can be used as the color developer compound.
• Suitable color developer compounds are aromatic compounds of the p-phenylenediamine type containing at least one primary amino group, for example N, N-dialkyl-p-phenylenediamines, such as N, N-diethyl-p-phenylenediamine, 1- (N-ethyl-N-methylsulfonamidoethyl) -3 -methyl-p-phenylenediamine, 1- (N-ethyl-N-hydroxyethyl-3-methyl-p-phenylenediamine and 1- (N-ethyl-N-methoxyethyl) -3-methyl-p-phenylenediamine.
• N, N-dialkyl-p-phenylenediamines such as N, N-diethyl-p-phenylenediamine, 1- (N-ethyl-N-methylsulfonamidoethyl) -3 -methyl-p-phenylenediamine, 1- (N-eth
• the material is usually bleached and fixed. Bleaching and fixing can be carried out separately or together.
• the usual compounds can be used as bleaching agents, for example Fe3+ salts and Fe3+ complex salts such as ferricyanides, dichromates, water-soluble cobalt complexes etc. are particularly preferred Iron III complexes of aminopolycarboxylic acids, in particular, for example, ethylenediaminetetraacetic acid, N-hydroxyethylethylenediamine triacetic acid, alkyliminodicarboxylic acids and of corresponding phosphonic acids. Persulphates are also suitable as bleaching agents.
• a color photographic recording material for the color negative color development was prepared (layer structures 1a to 1c by applying the following layers in the order given to a transparent cellulose triacetate support. The amounts given are based on 1 m2. The corresponding amounts of AgNO3 are given for the silver halide application. All silver halide emulsions were stabilized per 100 g of AgNO3 with 0.1 g of 4-hydroxy-6-methyl-1,3,3a, 7-tetraazaindene.
• Table 1A Silver halide applications (in g AgNO3 / m2) of the layer structures (1a - 1c) layer Structure 1a Structure 1b Structure 1c 2nd 0.25 0.28 0.25 3rd 1.50 1.30 1.33 4th 0.20 0.25 0.25 5 0.30 0.32 0.30 6 1.40 1.12 1.14 7 0.20 0.23 0.20 9 0.20 0.25 0.20 10th 1.25 1.08 1.12 11 0.35 0.38 0.35 total 5.65 5.21 5.14
• each of the layer structures 1a to 1c was exposed behind a gray step wedge with white light (exposure time: 0.01 s) and according to a color negative processing method, as in "The British Journal of Photography (1974), pages 597 and 598 described, processed.
• the measurement method is described in: T.H. James, The Theory of the Photographic Process, 4th ed., MacMillan Publ. Co., New York (1977) p. 619. Numerical values of the measured color granularities are also shown in Table 1B.
• the interimage effect results as a percentage distribution of the color gradation when the color separation is exposed to light of the corresponding spectral range in relation to the color gradation that is obtained when exposed to white light (described for example by TH James, The Theory of the Photographic Process, 4th edition , McMillan Co. NY (1977) pp. 574 and 614).
• Table 2A Silver halide applications (in g AgNO3 / m2) of the layer structures (2a to 2c) layer Structure 2a Structure 2b Setup 2c 2nd 0.15 0.18 0.16 3rd 0.30 0.35 0.32 4th 1.30 1.15 1.17 5 0.20 0.22 0.20 6 0.20 0.22 0.22 7 0.25 0.30 0.26 8th 1.20 1.04 1.04 9 0.15 0.18 0.16 11 0.25 0.29 0.27 12 1.20 1.03 1.04 13 0.30 0.37 0.32 total 5.50 5.33 5.16
• Layer 1 (antihalo layer like layer 1 of layer structure 1a) layer 1 Layer 2 (blue-sensitive layer A) like layer structure 1a, layer 9 but 0.35 g AgNO3 / m2 Layer 3 (blue-sensitive layer B) as layer structure 1a, layer 10 but 1.50 g AgNO3 / m2 Layer 4 (blue-sensitive layer A ') like layer structure 1a, layer 11, however, 0.15 g AgNO3 / m2 Layer 5 (red sensitive layer A) red sensitized silver chloride bromide emulsion (3.2 mol% bromide; average grain diameter 0.28 ⁇ m) out 0.30 g AgNO3, with 0.75 g gelatin 0.90 g cyan coupler C-1 Layer 6 (red-sensitive layer B) red-sensitized silver chloride bromide T-grain emulsion (4.0 mol% bromide) with the following parameters: medium grain diameter 1.65 ⁇ m) thickness 0.18 ⁇ m Aspect ratio 9: 1 mean sphere equivalents 0.77 ⁇ m
• Example 3 only using the DIR coupler in layers B significantly improves the color and interimage (with layer structure 3a), whereas when using the DIR coupler in layers A and A '(with layer structure 3b ) these sizes, which are important for the image quality, can hardly be improved compared to the DIR coupler-free layer structure 3c.
• Layer structure 3a is also characterized by particularly good image sharpness.

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