JPS5936253B2 - Photographic elements for diffusion transfer film units - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Background of the Invention Diffusion transfer photographic products are known in the art, and details related thereto can be found in U.S. Pat. No. 2,983,606;
No. 644; No. 3415645; No. 3415646
No. 3473925; No. 3482972; No. 3551406; 3 No. 3573042; No. 3
No. 573043; No. 3573044; No. 3576
No. 625; No. 3576626; No. 3578540
No. 3569333; No. 3579333; No. 3594164: No. 3594165; 4 No. 3
No. 597200; No. 3647437; No. 3672
No. 486; No. 3672890; No. 3705184
No. 3,752,836; No. 3,857,865; all of which are incorporated herein in their entirety.

Basically, diffusion transfer photographic products and methods involve a film unit having a light-sensitive system comprising at least one silver halide layer, usually integrated with an image-providing substance.
After the photosensitive system has been photographically exposed, it is developed to establish an image-wise distribution of diffusible image-donating material, at least a portion of which mordants the image-donating material transferred by diffusion or otherwise. The image is transferred to an image-receiving layer that can be fixed with. In some diffusion transfer products, the transferred image becomes visible by reflection after separation of the image-receiving layer from the photosensitive system. However, in other products such separation is unnecessary and instead the transferred image-receiving layer is placed against a reflective background typically provided by a dispersion of a white reflective pigment such as titanium dioxide. You can see it with your own eyes. Film units of the latter type are commonly referred to in the art as integrated negative-positive film units and are described, for example, in the above-mentioned U.S. Pat.
No. 94165. Adding a polymeric latex to the gelatin silver halide emulsion layer increases the flexibility of the silver halide emulsion layer, i.e. eliminates the occurrence of fog due to stress occurring in the film unit containing said silver halide layer. known in the art.

US Pat. No. 2,772,166 describes a gelatin silver halide emulsion which also contains a hydrosol formed from the emulsion polymerization of a mixture of styrene, acrylonitrile or vinylidene chloride with an alkyl acrylate or alkyl methacrylate and acrylic acid. The hydrosols described herein are used in a range of 1 to 10% of gelatin. U.S. Pat. No. 2,835,582 relates to a mixture of gelatin in a silver halide layer and a polymeric hydrosol, which hydrosol is prepared by polymerizing at least one monoethylenically unsaturated monomer in the presence of an amphoteric surfactant. Manufacture. Among suitable monomeric materials are methyl methacrylate and styrene. It is a requirement that the polymeric material be film-forming, and the present invention relies on the presence of an amphoteric surfactant to confer enhanced compatibility with gelatin. US Patent No. 3157
No. 510 claims that a fine-grained dispersion of a water-insoluble soft acrylate polymer is used in gelatin as the first and second photosensitive silver halide layers. Elements in range 2 of .

12. The element of claim 11, wherein the difference in speed is about 5 stops.

13(a) a first layer distal to the exposed surface of the photosensitive element containing silver halide grains having a first average grain size;
(b) a second photosensitive silver halide layer having a second average grain size; The first and second photosensitive silver halide layers are in an adjoining relationship, and the degree of point-to-point exposure of the silver halide to actinic radiation is higher than that of the silver halide layer. the first and second light-sensitive silver halide layers are substantially non-swellable in aqueous alkali and compatible with gelatin; Contains inert grains that are non-film forming and gelatin; the inert grains have an average diameter that is less than or equal to silver halide;
3. The photosensitive element of claim 2, wherein the silver halide grains are used in a diffusion transfer film unit having an average diameter of 2.5 microns or less.

This application with reference to other applications is dated May 2, 1978 and September 5, 1978.
Application serial number 901995, each filed on date
Background of the Invention Diffusion transfer photographic products are known in the art, and details related thereto can be found in U.S. Pat. No. 2,983,606;
No. 644; No. 3415645; No. 3415646
No. 3473925; No. 3482972; No. 3551406;. Same No. 3573042; Same No. 3
No. 573043; No. 3573044; No. 3576
No. 625; No. 3576626; No. 3578540
No. 3569333; No. 3579333; No. 3594164; No. 3594165; No. 3
No. 597200; No. 3647437; No. 3672
No. 486; No. 3672890; No. 3705184
No. 3,752,836; No. 3,857,865; all of which are incorporated herein in their entirety.

Basically, diffusion transfer photographic products and methods involve a film unit having a light-sensitive system comprising at least one silver halide layer, usually integrated with an image-providing substance.
After the photosensitive system has been photographically exposed, it is developed to establish an image-wise distribution of diffusible image-donating material, at least a portion of which mordants the image-donating material transferred by diffusion or otherwise. The image is transferred to an image-receiving layer that can be fixed with. In some diffusion transfer products, the transferred image becomes visible by reflection after separation of the image-receiving layer from the photosensitive system. However, in other products such separation is unnecessary and instead the transferred image-receiving layer is placed against a reflective background typically provided by a dispersion of a white reflective pigment such as titanium dioxide. You will see it with your own eyes. Film units of the latter type are commonly referred to in the art as integrated negative-to-positive film units and are described, for example, in the above-mentioned U.S. Pat.
No. 94165. Gelatin: A polymeric latex is added to the silver halide emulsion layer to increase the flexibility of the silver halide emulsion layer, that is, to eliminate the occurrence of fog due to stress occurring in the film unit containing the silver halide layer. This is known in the art.

US Pat. No. 2,772,166 describes a gelatin silver halide emulsion which also contains a hydrosol formed from the emulsion polymerization of a mixture of styrene, acrylonitrile or vinylidene chloride with an alkyl acrylate or alkyl methacrylate and acrylic acid. The hydrosols described herein are used in a range of 1 to 10% of gelatin. U.S. Pat. No. 2,835,582 relates to a mixture of gelatin in a silver halide layer and a polymeric hydrosol, which hydrosol is prepared by polymerizing at least one monoethylenically unsaturated monomer in the presence of an amphoteric surfactant. Manufacture. Among suitable monomeric materials are methyl methacrylate and styrene. It is a requirement that the polymeric material be film-forming, and the present invention relies on the presence of an amphoteric surfactant to confer enhanced compatibility with gelatin. US Patent No. 3157
No. 510 relates to a gelatin silver halide emulsion which also contains a finely divided dispersion of a water-insoluble soft acrylate polymer at a level of about 5 to 40% by weight of gelatin.

U.S. Pat. No. 3,325,286 discloses a Zera. This invention relates to silver halide emulsions.

This emulsion layer also requires a polyoxyethylene compound as defined in this patent. One of the polymeric materials cited is a homopolymer of alpha monohydrocarbon substituted acrylic esters. U.S. Pat. No. 3,547,650 is directed to a gelatin monosilver halide emulsion comprising an aqueous dispersion of a polymeric vinyl compound dispersed with a mixture of specific organic phosphates.

One of the polymeric vinyl compounds cited is a homopolymer of alpha monohydrocarbon substituted acrylic esters. U.S. Pat. No. 3,772,032 relates to a gelatin silver halide emulsion comprising a polymer latex prepared by emulsion polymerization in the presence of at least 5% by weight of an emulsifier to reduce the stress sensitivity of the emulsion.

This patent shows that when certain emulsifiers are used at levels of at least 5% by weight, the emulsion does not fog even when large amounts of methyl methacrylate are used in the latex.
It is stated that even the presence of 50% methacrylic acid in the latex causes an unacceptable increase in capri. U.S. Pat. No. 3,773,517 relates to a gelatin-silver halide emulsion containing a polymer latex prepared by copolymerizing monomers that form a water-insoluble homogeneous polymer and monomers that form a water-soluble polymer. This patent requires that polymerization occur in the presence of specific alkylaryl polyether phosphate surfactants. One of the monomers that will form a water-free homopolymer is an alkyl methacrylate. U.S. Patent No. 3418
No. 132 relates to photographic film units, one embodiment of which is particularly suited for increased rapid processing by the addition of inert grains in at least one layer of the photographic element.

The inert particles include starch, barium sulfate, calcium carbonate, synthetic resin, and the like. Inert grains range from 7 to 15 microns. Film units having adjacent silver halide emulsion layers sensitive to the same spectral region are known in the art, as shown in the following representative patents: US Pat.

U.S. Pat. No. 3,505,068 relates to a photographic element containing stacked silver halide emulsions, the first of which is a conventional silver haloiodide emulsion and the second an iodine-free shell and a silver iodide core. Contains grains having

U.S. Pat. No. 3,663,228 has multiple silver halide emulsion layers that are divided into sets such that each set is at a different speed, and the layers within each set have the same speed but are sensitive to different spectral regions. Regarding photographic film units.

A color filter is placed between the layers. US Patent No. 36
No. 95882 relates to a photosensitive element consisting of a support carrying two emulsions, each containing a non-diffusive color coupler.

Each emulsion has a different speed and a different silver halide-coupler molar ratio. U.S. Pat. No. 3,846,135 describes the stacking of the two when the lower layer is less sensitive than the upper layer and the highest concentration of the upper layer is at least 0.9 while the highest concentration of the lower layer is at least 1.5. The present invention relates to synergistically increasing the sensitivity of silver halide layers coated with silver halide.

The bottom layer has a thickness of about 5 to 15 microns. US Patent No. 3
No. 960,558 and No. 4,003,744 disclose split dye imaging materials containing dye image-forming materials combined therein.
A diffusion transfer film unit is described which uses a silver halide emulsion, in which one of the adjacent layers contains a dye-imaging material.

U.S. Pat. No. 3,632,342 carries at least one layer with a high contrast silver halide emulsion layer containing an acrylic latex material and another silver halide layer containing no latex micelles and containing a hydrophilic colloid. The present invention relates to a photographic element comprising a support.

It is stated that although separate micelles are preferred, aggregation can also occur. Copolymers of hydrophilic and hydrophobic monomers are described. ? SUMMARY OF THE INVENTION The photographic film unit of the present invention has a dye imaging material associated therein, preferably an alkali-soluble, diffusible dye developer as a function of exposure and development of the silver halide emulsion layer. at least a first photosensitive silver halide emulsion layer containing a dye image-providing substance and a polymeric layer dyeable with the dye image-providing substance, the dyeable polymeric layer containing a During processing of the photosensitive silver halide emulsion, ie, during contact of the emulsion with an aqueous alkaline processing composition, the photosensitive silver halide emulsion is in at least a laminated relationship with the photosensitive element; The layer comprises a photosensitive halogen disposed in a mixture of gelatin and inert particles that are substantially non-swellable in alkali, compatible with gelatin, and substantially non-film-forming or non-agglomerating. The inert grains have an average diameter equal to or smaller than the silver halide grains, and the diameter of the silver halide grains is 2.5.
It is micron or smaller.

Preferably, the film unit of the present invention is an integrated negative-positive film unit of the type described, for example, in US Pat. No. 3,415,644 and US Pat. No. 3,647,437.

These patents are incorporated herein. Suitable inert particles are derived from polymeric latexes consisting of homogeneous polymers of methyl methacrylate or styrene. As used herein, the term ``light-sensitive silver halide emulsion layer'' refers to a layer sensitive to the same portion of the spectrum and a contiguous relationship, i.e., a ``split emulsion layer'' as will be explained in more detail below. It is assumed that the photosensitive layer includes first and second photosensitive silver halide layers called first and second photosensitive silver halide layers.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to dye developers as dye image-forming materials. Although described herein, it will be understood that other dye imaging materials may be used in the present invention.

Dye developers are well known in the art. A dye developer is a compound containing a dye coloring system and a silver halide developable group. In the multicolor method, it is suitable. A dye developer providing an image dye of the appropriate color is combined with each silver halide emulsion layer; for example, a cyan dye developer with a red-sensitive silver halide layer; a magenta dye developer with a green-sensitive silver halide emulsion. layer; and a yellow dye developer is combined with a blue-sensitive silver halide emulsion layer. The terminally oxidized dye developer is insoluble in water but mobile in aqueous alkaline. Oxidation of the dye developer as a result of development of the exposed silver halide results in its passivation, while the unoxidized dye developer diffuses into the dyeable image-receiving layer and produces a positive image therein. I will do it. The unoxidized dye developer was combined as quickly as possible in conjunction with its development to allow rapid transfer of the unoxidized dye developer and to avoid the desired interference in the negative. Preferably, it passes through the silver emulsion layer.

It is desirable to form the silver halide emulsion layer with a minimum amount of gelatin because gelatin swells to a significant degree on contact with photographic processing compositions, which acts to retard dye developer transfer. However, the minimum amount of gelatin used is largely controlled by the size of the silver halide grains. Therefore, enough silver halide grains are retained in the layer, i.e. at the interface in contact with the adjacent layer, to prevent silver halide grains, or a portion of these grains, from being released through the gelatin layer. It is desirable to use enough gelatin to block. Therefore, larger size grains, typically used in high speed emulsions, require more gelatin than smaller grains to form a continuous layer with no release occurring when contacted with adjacent layers at the same unit weight coverage. Understand what you need. The present invention facilitates the transfer of imaging material through the gelatin-silver halide emulsion layer while retaining the silver halide grains completely within the layer without having any deleterious effects on the photographic properties of the film unit. It was found here that there is not.

In fact, the reduction of the slope, the foot part (TOeexten
t) and enhanced dynamic range (Dynami
Unexpected photographic advantages are achieved, as evidenced by the H&D curves that show . As mentioned above, these advantages include being virtually non-swellable in aqueous alkali, being compatible with gelatin to avoid agglomeration within the layer; and having a refractive index that closely approximates that of gelatin. Excessive light scattering can be avoided; virtually non-film forming (
film-forming properties further inhibit dye transfer); and inert grains with sufficient hardness to retain their physical identity as individual grains in the presence of an aqueous alkali are deposited on the gelatin-silver halide layer. This is achieved by providing a gelatin layer that is non-swellable and has a fairly large cohesive mass.

Inert particles suitable for use in the present invention include starch, barium sulfate, calcium carbonate, cellulose esters such as cellulose acetate propionate, cellulose esters such as ethylcellulose, cloth, polyvinyl acetate, polycarbonate, homostyrene and Synthetic resins such as copolymers, zinc oxide, silica, titanium dioxide,
Includes inorganic oxides such as magnesium oxide and aluminum oxide, as well as hardened gelatin grains, calcium sulfate, barium carbonate, and the like.

As mentioned above, the preferred inert particles for use in the present invention are polymethyl methacrylate and polystyrene, and by placing the polymethyl methacrylate latex or polystyrene latex in an emulsion, the film unit Give.

The film forming and hard properties of a polymer are related to the glass transition temperature of the polymer. That is, the Tg of the polymer should be at or above the temperature at which the polymer is dried.
The Tg is preferably 35°C or higher, more preferably 60°C or higher. T in a particularly preferred embodiment
g is 100°C or higher. It should be understood that the polymer latex may be a homopolymer or a copolymer so long as the comonomer does not modify the copolymer to such an extent that it no longer retains the desired properties.

The inert grains should not be larger than the silver halide grains with which they are combined.

The maximum average diameter of silver halide grains in the present invention is 2.5
Microns or smaller, preferably less than 2.0 microns. Therefore, the lower limit of inert grains is determined by the fact that plugging of grains that would interfere with dye transfer should be avoided. It is preferred to use inert particles with a diameter not smaller than 0.075 microns. In a particularly preferred embodiment, the inert grains have an average diameter that is 10-15% of the average diameter of the silver halide grains with which they are associated. The amount of polymer latex to be used can be readily determined for any given silver halide emulsion.

For a given silver halide grain size, decreasing the amount of gelatin increases the polymer gelatin ratio to maintain a layer of the same size. Sufficient gelatin must be present to maintain layer integrity and prevent pulverization of the polymer particles. It is preferred to use a polymer latex (solids) to gelatin ratio of 0.5:1 to 10:1.

A ratio of 1 to 1 is preferred for fine grains (less than about 1 micron) and 6 to 1 for coarse grains (greater than about 1.3 microns). Thus, in a preferred embodiment, the average median diameter of the fine grains is less than about 1μ and the large grains are greater than 1.3μ. As noted above, the novel photosensitive silver halide layers of the present invention include first and second photosensitive silver halide layers that are adjacent and responsive to substantially the same spectral region. sell. Thus, in another aspect, the diffusion transfer photographic film units of the present invention have a first average grain size: a first light-sensitive silver halide emulsion layer containing silver halide grains and a second average grain size. a second light-sensitive silver halide emulsion layer containing silver halide grains having a grain size and a layer suitable for receiving an imaging substance diffused therein and applying an aqueous processing composition thereto; The first and second mono-silver halide emulsion layers are comprised of a plurality of layers including means for the first and second silver halide layers contain no dye imaging material, but have a point-to-point degree of activating radiation of the silver halide associated therewith; and at least one of the silver halide layers contains gelatin and inert grains as defined above.
When inert grains are used as the only layer, this layer contains large silver halide grains. The intrinsic velocity of the second silver halide emulsion layer is greater than the intrinsic velocity of the first silver halide emulsion layer. However, if the thickness of the gelatin combined in the layer is about 50% or less of the average volume diameter of the grains, the applied layer will not retain its monolithic character but will be due to intermixing of the grain sizes. Collectively, the resulting aggregated silver halide layer behaves as if it were coated with a single layer with the formulated grain size, thus not losing all of the advantages of a layered structure, and The disadvantages of low gelatin systems will be introduced.

An advantage of the present invention is that it maintains separation of development by-products, at least in part, by maintaining good separation in the development process of individual grains, as well as by incorporating the inert grains. This is thought to be caused by this.

By using such inert grains in the layers, these layers are themselves separate and have different dimensions held within the separate layers. to hold. As mentioned above, the second silver halide layer, ie the layer closest to the exposed surface, has a higher intrinsic velocity than the first silver halide layer.

Preferably, this speed difference is at least about 2 stops and can range up to about 8 stops. In a particularly preferred embodiment, this difference is about 5 stops. Polymeric latexes suitable for use in the present invention can be prepared by known techniques.

The following non-limiting examples illustrate the production of latexes suitable for use in the present invention. The reactor was charged with deionized water 1021 and Dorfax 2A1 and heated to 83° C. under nitrogen whereupon methyl methacrylate 7.6
5 kg was added and mixed until the temperature returned to 83°C.

After 5 minutes at 83°C, the initiator solution (potassium persulfate 0.
15k9 and water 14.79k9) Add 4.93k9.

After an exotherm, the temperature was lowered to 85° C. and the remaining methyl methacrylate was added at a rate of about 361 V/min and the remaining initiator solution at a rate of about 111 y/min. At the end of the monomer and initiator addition, the temperature was maintained at 850° C. for 10 minutes and then ascorbic acid was added. The resulting latex had 30% solids and the latex grains had an average diameter of about 0.125 microns. The following non-limiting examples illustrate the invention: Example 1 (Control) A photosensitive element was prepared by applying the following layers in sequence to a gelatin-subbed opaque polyethylene terephthalate film base.

1. Contains cyan dye developer dispersed in gelatin,
Dye approx. 747m9/771″, gelatin approx. 1554W1
y/M2, 4'-methylphenylhydroquinone approx. 2
70~/771″ and 2 = phenylbenzimidazole coated with a coverage of approximately 270 m/771″; 2.
Approximately 1280 Tn9/m” of silver and approximately 768 m of gelatin
1.05μ grains and 1.5μ grains applied at a coverage of 9/m”
red-sensitive gelatinoiodine silver bromide emulsion layer consisting of a 50/50 blend with μ grains; 3. Approximately 25007ny/771″
Butyl acrylate, diacetone acrylamide, styrene and methacrylic acid with a coverage of 60-30-
4. Interlayer coated with a 4-6 quaternary polymer and polyacrylamide of about 77 m/m"; 4. Containing a magenta dye developer dispersed in gelatin, dye about 646 W9/m and gelatin about 426 mif7/771" , and 2-phenylbenzimidazole at a coverage of about 229 mf7/g;5. 6. Green-sensitive gelatinous silver bromide emulsion layer coated with a coverage of about 753 mf/m" of silver and about 3472 mf7/d of gelatin; 6. Quaternary polymer as described above in layer 3; 7. An intermediate layer having a coverage of about 24~/m'' and succinic dialdehyde at a coverage of about 75~/m''; 7. Containing a yellow dye developer dispersed in gelatin and containing a dye of about 968~/m'';
Tn9/wl, gelatin about 450 m9/m', and 2-phenylbenzimidazole about 208 W19/
8. Layer coated with a coverage of Trl''; 8. Silver approx. 1280~/
Wl. Gelatin about 743~/m" and 4'-methylphenylhydroquinone about 2047r19/Wi"
a blue-sensitive gelatinoiodine silver bromide emulsion layer coated at a coverage of 9. Gelatin approx. 484m9/77! Top coat applied with a coverage of 43" and carbon black 43-/m".

The receiving element was prepared by coating the following layers in sequence on a 4 mil polyethylene terephthalate film base.

Each of these layers consists of:1. Partial butyl ester of polyethylene/maleic anhydride copolymer with a coverage of about 28,000~/m'' as a polymeric acid layer;
2. Butyl acrylate, diacetone acrylamide, styrene and methacrylic acid 60-30-4-
6 copolymer and polyvinyl alcohol in a ratio of about 75:1 and a coverage of about 5600 rf9/m; and 3. Polyvinyl alcohol and poly-
A polymeric image receiving layer containing a 2:1 mixture by weight of 4-vinylpyridine with a coverage of about 3300 to 771".

The aqueous alkaline solution was made from:

Example 2 Green sensitivity of Layer 2...Silver halogenide emulsion layer is further approximately 0.12
A second film unit was made as described above, except that it contained a polymethyl methacrylate latex having an average particle size of 5 and the coverage of layer 6 was reduced by 40%.

The film units were processed in the following manner: The film units were exposed to white light against a multicolor target and the processing composition was developed in the dark as a layer approximately 0.0028 inch thick between the two elements.

In the resulting multicolor reflection print, we obtained the following sensitometer data (green light reflection data in the neutral column): From the above: 30 units decrease in slope; approximately 14 units increase in toe area and 5 units more. It can be seen that a large dynamic range increase is achieved.

The losses exhibited in other properties are not significantly significant; ie, these benefits far outweigh the slight decreases recorded in Dmax and speed, which are actually within experimental error. It should be understood that these enhanced photographic results are obtained at the same time as acceleration of magenta dye transfer. Example 3 To illustrate the rapid dye transfer achieved by the novel invention, the following structures were made: A. cyan dye of Example 1 on polyester base 25η/Ft2 (269 W/M2); gelatin 50 W/M2;
Ft2 (538 w/i) and succinic aldehyde 2η
/Ft2 (21.5 w/w) was applied.

B. Gelatin 180η/Ft2 derivatized from Structure A
(1938 Wa/M2). C. Structure A was coated with inert gelatin 180m'/Ft2 (1938m'/7T
It was overcoated with I). D. Structure A is gelatin 40η/F
t2 (431 W/I) and polymethyl methacrylate latex 160η/Ft2 (1722 m'/M2) (
0.125μ average diameter) mixture.

The processing composition described above was spread between the above structure and the stacked dye image-receiving layer described in Example 1 to a thickness of 28 mils. The concentration of dye deposited on the receiver sheet was measured as a function of time.

The resulting data are shown below: The table above shows the detrimental effect that gelatin has on dye transfer. The table also shows that, although at a higher coverage than the gelatin layer, a layer consisting of gelatin and latex grains gives transfer speeds that are close to the results obtained with no overcoat at all, especially during the initial period. There is. The following non-limiting examples illustrate particularly preferred film units of the present invention: Example 4 (Control) The following layers are applied in sequence onto a gelatin-subbed opaque polyethylene terephthalate film base to form a photosensitive element: Ivy: 1. Contains cyan dye developer dispersed in gelatin, dye approximately 747 W/M°, gelatin approximately 155
4w/M2, 47-methylphenylhydroquinone approx. 2
70 η/M2 and a layer applied with a coverage of about 270 mg/M2 of 2-phenylbenzimidazole;2. Approximately 1 silver
3. A red-sensitive gelatinoiodine silver bromide emulsion layer coated with a coverage of 280 η/Trl and gelatin of about 768 η/m. Butyl acrylate, diacetone acrylamide,
4. An intermediate layer coated with a 6030-4-6 quaternary polymer of styrene and methacrylic acid at a coverage of about 2500 wt9/Rri' and polyacrylamide at a coverage of about 77 Wt/Rri'; 4. Contains a magenta dye developer dispersed in gelatin, about 646 dyes/M2 and about 42 gelatin
6 w/i and 2-phenylbenzimidazole approx. 22
5. Layer applied with a coverage of 9-/d; 5. Silver approx. 366~/
A first layer of 0.6μ average medium diameter grains coated at a level of about 161η/I and gelatin and about 387μ of silver.
Immediately/I and gelatin applied at a level of approximately 186Tf19/d and having a mean median diameter of 1.42μ
a green-sensitive silver halide emulsion unit consisting of a layer of about 1,369 to 100% of the above-mentioned quaternary polymer in layer 3, with a speed difference of about 5 stops between the first and second layers; The coating amount is approximately 24Tf1fi! 7. Interlayer containing a yellow dye developer dispersed in gelatin, containing about 968 g/ml of dye and about 450 g/ml of gelatin.
W/M2 and 2-phenylbenzimidazole approx. 20
8. Layer applied with a coverage of 8 m9/M2; Silver approx. 1280
7r19/Rrl, gelatin about 743 m'/M2 and 4'-methylphenylhydroquinone about 204 rf19
9. A blue-sensitive gelatino-iodine silver bromide emulsion layer coated at a coverage of about 484 W/m" of gelatin and an earth coat coated at a coverage of about 43 W/m" of gelatin and carbon black.

Example 5 Each green-sensitive silver halide emulsion layer in layer 5 has an additional layer of about 0.
A second film unit was made as described above, except that the polymethyl methacrylate latex having an average particle size of 125 microns was contained at four times the gelatin coverage and the layer 6 coverage was reduced by 40%. Ivy.

The film units of Examples 4 and 5 were processed using the receiver element and processing composition described in Example 1 in the following manner.

The film unit is exposed to white light and the processing composition is developed in the dark as a layer approximately 0.0028 inch thick between the two elements.

In the resulting multicolor reflection print, we obtained the following sensitometer data (green light reflection data in the neutral column): From the above, a slight increase in Drnax, a 51 unit decrease in slope, and approximately 14 units in the toe area. increase in and dynamic range of nearly 12
It can be seen that an increase in units is achieved.

The losses exhibited in other properties are not significantly significant, ie the benefits far outweigh the slight decrease recorded in speed. It should be understood that these enhanced photographic results are obtained simultaneously with acceleration of dye transfer and preservation of the integrity of the silver halide layer. It should be noted that the coverage of the interlayer (layer 6) adjacent to the silver halide emulsion layer containing inert grains is reduced by 40%.

This is an additional unexpected advantage of the present invention which further increases dye transfer. The polymer latex used is 9
A film unit similar to Example 5 was made except that it was a 0/10 methyl methacrylate/hydroxypropyl acrylate copolymer.

Claims (1)

Claims: 1. at least one dye image-forming substance in combination.
a support carrying two photosensitive silver halide layers, said silver halide layer comprising substantially non-film-forming inert grains and gelatin that are substantially non-swellable in aqueous alkali and compatible with gelatin. the inert grains have an average diameter equal to or smaller than the silver halide grains; the silver halide grains have an average diameter of 2.5 microns or less; sexual element. 2. A first light-sensitive silver halide layer comprising: (a) a silver halide layer distal to the exposed surface of the element and having a first average grain size; (b) a second grain size having a second average grain size;
a photosensitive silver halide layer; the second photosensitive silver halide layer has a higher specific velocity than the first photosensitive silver halide layer; 2. The element of claim 1, wherein the layers are in contiguous relationship; the inert grains are disposed in at least the second silver halide layer. 3. The element of claim 1 or 2, wherein the inert particles are derived from a polymeric latex. 4. The element of claim 3, wherein the polymer is polymethyl methacrylate. 5. The element of claim 3, wherein the polymer is polystyrene. 6 The ratio of inert grains to gelatin (by weight) is approximately 0.
The elements of claims 1 and 2 in a ratio of 5:1 to 10:1. 7. The element of claim 6, wherein the inert grain to gelatin ratio is about 1:1. 8. The element of claim 6, wherein the inert grain to gelatin ratio is about 6 to 1. 9. Claim 1, wherein the dye image-forming substance is a dye developer.
and 2 elements. 10. Claim 2, wherein the average diameter of the silver halide grains in the first photosensitive silver halide layer is less than about 1 micron and the average diameter of the grains in the second photosensitive layer is greater than about 1.3 microns. elements of. 11. Claim 2, wherein the speed difference between the first and second photosensitive silver halide layers ranges from about 2 to about 8 stops.
elements of. 12. Claim 11, wherein the speed difference is approximately 5 stops.
elements of. 13 (a) distal to the exposed surface of the photosensitive element;
a first photosensitive silver halide layer containing silver halide grains having a first average grain size; (b) a second photosensitive silver halide layer having a second average grain size; the second photosensitive layer has a higher specific speed than the first photosensitive silver halide layer; The first and second light-sensitive silver halide layers contain a combination of dye-imaging substances which can be diffused during processing depending on the point-to-point degree of exposure of the silver halide; Contains inert grains and gelatin that are non-swellable and substantially non-film-forming and compatible with gelatin; the inert grains have an average diameter smaller than or equal to the silver halide; the silver halide grains have an average diameter that is less than or equal to the silver halide grains; Claim 2 for use in diffusion transfer film units having a diameter of 2.5 microns or less
photosensitive element. This application with reference to other applications is dated May 2, 1978 and September 5, 1978.
Application serial number 901995, each filed on date
No. 939257 and a partial continuation application of No. 939257.