JP2001350241A - One-side coated silver halide photographic film material with reduced tendency to curl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-side coated silver halide photographic film material less liable to curl before and after processing. SOLUTION: The one-side coated photosensitive silver halide photographic film material includes one or more silver halide emulsion layers top-coated with an outermost protective layer on one side of an undercoated base and a back layer coated with an outermost protective layer on the other side of the base. Each of the emulsion layers contains silver halide grains (the total coating weight of the silver halide is >=5 g/m2 expressed as the equivalent of silver nitrate) dispersed in a binder and <30 wt.% latex polymer based on the amount of the binder. At least the back layer has been provided with an organic component which does not crosslink in a reaction with a curing agent as a second binder in addition to a crosslinked or crosslinkable first binder in its at least one layer and the organic component is a polymer selected from the group comprising dextran having a molecular weight of <=20,000 and polyacrylamides each having a molecular weight of <=20,000.

Description

DETAILED DESCRIPTION OF THE INVENTION

FIELD OF THE INVENTION The present invention relates to a single-side coated black-and-white imaging material comprising a support material, an imaging layer on one side thereof, and a backing layer on the other side.

BACKGROUND OF THE INVENTION In medicine, the inspection of classically processed silver halide radiographic film material is usually performed on a light box. In one example, the film storing the diagnostic image irradiates a part of the human body to be examined with X-rays emitted from an X-ray generator, and then modulates the X-rays and a radiographic X-ray conversion screen (sensitized Screen, also called a fluorescent screen or a phosphor screen). The luminescent phosphor particles present in dispersed form in the layers of the X-ray conversion screen absorb X-rays and convert them into visible light, thus providing a radiographic halogen in intimate contact with the X-ray conversion screen. The silver halide film material is exposed with the emitted visible light. Development, fixing,
After film processing, including rinsing and drying steps, a diagnostic image readable on a light box is obtained.

[0003] The film material may be coated with a hydrophilic photosensitive silver halide emulsion layer on one or both sides of the film support depending on the application. For example, in chest radiography where high sensitivity after rapid processing (high throughput) is given priority, the film support is coated on both sides with said photosensitive layer. During X-ray exposure, both sides of the double coated or double coated film material are in direct contact with the intensifying screen. It can be expected that the resolution will be reduced as a result of the crossover exposure of such a screen-film system in which the film is sandwiched between the two screens. Examples of means for minimizing crossover exposure and systems including double coated film material in contact with two screens are described in numerous references, for example EP-A 04
86783, 0552116, 05917747, 086
2083 and 0890873 (but not limited to)
Can be found in

No other field of radiology requires such high levels of image quality, such as mammography, and the ability of mammography to depict relevant diagnostic information is largely determined by the resolution of the screen-film system. Therefore, it is recommended to use a single screen that contacts the one-sided coated film material. In said film material, a single thin photosensitive emulsion layer preferably comprises fine silver halide emulsion grains or crystals dispersed in a binder. Examples of means for obtaining high resolution without losing much speed (sensitivity) and a screen-film system comprising only one screen and one film contacting on the emulsion side are described, for example, in EP-A 0 482603,0.
610609, 0712036, 0874275 and 0
933670.

In another example, a hard copy of an image generated by electronic diagnostic techniques such as digital laser computed tomography, magnetic resonance imaging, ultrasound, etc., should also provide inspection equipment on a light box. . Laser imagers are digital systems that include high-performance digital computers: instead of printing the image, the input image can be temporarily stored in electronic memory, and the layout and data of the image are actually stored on film. It can be processed before it is printed. This electronic memory offers the possibility of buffering input data from several diagnostic conditions by means of an image network, for example, which is actually advantageous compared to CRT imaging in which a hard copy is exposed image by image. In that case, while one test is being performed, the imager is unavailable for other tests, and consequently each diagnostic unit requires a separate CRT imager.

[0006] The photographic hardcopy materials used in laser imagers must combine good physical properties with excellent image quality required for error free film handling by the imager. With respect to image quality, the photographic material has a high sharpness, a good image tone (hue) of the developed silver, preferably a pure black image, a preferred gloss level,
And high maximum concentrations and alpha figures (crisp alfanumeri
It is preferable to have an appropriate contrast value to allow cs). Rapid access of photographic images is highly desirable in this application. The access time of the laser hardcopy material, especially when implemented in an image network, should be as short as possible. Factors that cause delays in the time the process takes place are the exposure time of the film by the laser, the transport time before exposure to the system and after exposure to the automatic processor, and the processing time from drying to drying of the hardcopy material. might exist. Exposure and transport times depend on the particular characteristics of the laser source, the mechanical configuration of the system, and the size of the hardcopy material, while processing time is the film property (sensitivity, also referred to as "speed")
And the chemical used in the processing cycle. Typical current processors have a dry to dry cycle of less than 60 seconds, more preferably less than 50 seconds. Such materials, film / screen combinations and / or
Or the processing method is described in, for example, EP-A 0610608,
0679015 and 0794456.

While there is no problem during the inspection of the processed film material on a light box due to the symmetrical layer arrangement of the double-sided coated radiographic material, apart from the outermost protective layer on one side of the support The actual problem of curl formation can be expected when there is an asymmetric layer arrangement with a light-sensitive emulsion layer and a backing layer on the other side. Since this problem is not only severe after the treatment, but already severe before the treatment, a high balance between the loading of the coating components in each layer is highly recommended.
Means for avoiding curl formation, especially in connection with mechanical shock, can be found in EP-A 0 520 420 and 0 568 268.

This problem is particularly apparent when the dried processed material has been handled on a light box for a period of time for inspection purposes. Since most of the diagnostic time on the mammographic film material is done by looking on the light box through the back of the film, any curl towards the back layer is bothering the radiologist. The appearance of curl is a result of the reduced loading of the coated material layer when the material is processed. This is because the amount of silver changes quite dramatically during processing. In addition, the warm-up directly around the glass surface outside the light box creates a local atmosphere with low relative humidity (less than 30% RH), so that the one-side coated film material forms a curl in the direction towards the backing layer Tend.

[0009] Loading of the layers on both sides of the film support with components to prevent curl after drying of the coated wet layer and to obtain complete equilibrium may form an initial problem during the coating process. Absent. This is because the material contains a large amount of water that must evaporate. However, while storage and handling, and prior to processing, the problem seems likely to be overcome, the problem is largely determined by the ambient conditions of the environment, especially due to heat (temperature) and humidity. Thus, the film material is optimized to reduce curl to low levels.

[0010] However, the problem is caused to a large extent by the processing steps. During the processing step, the coated hydrophilic layer is permeated by a large amount of aqueous solution of the developing compound from the developing solution, followed by an aqueous fixing solution of the fixing compound and optionally rinsed in an intermediate rinsing step, but the washing water after fixing is removed. Rinsing during the rinsing step. In particular during the rinsing or washing step, not only the reacted and unreacted developing or fixing compounds from the processing solution remain in the swollen layer again, but also the originally coated hydrophilic components may remain in said layer. After drying the layer (for a predetermined drying time, under conditions characterizing the automated processor that was processed),
The components remaining in each hydrophilic layer on both sides of the support will be critical to the results obtained with respect to curling of the material mounted on the light box.

The curl towards the (photosensitive) emulsion side which appears after coating and drying is dependent on the amount of processing solution (including rinsing water) absorbed and the degree of curing of the binder absorbed by the processing time and temperature as described in the processing cycle. This can be compensated for by the addition of a softening polymer for the binder to be determined (eg an acrylic or methacrylic acid latex polymer when gelatin is the binder). However, a frequent disadvantage is the occurrence of curl toward the backing layer after processing when the hydrophobic-hydrophilic balance, which gives the equilibrium between the two sides, is changed. Not all added ingredients do not affect sensitometry.

It is clear that the problem is even greater when large amounts of silver halide are coated and require large amounts of components (eg, gelatin binders and other polymers) to load the coated layer before and after processing.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a one-sided coating material that has a reduced tendency to curl before and after processing.

A further object is that no more than 30%, more preferably no more than 20%, of latex polymer be loaded on the photosensitive layer containing silver halide emulsion crystals.

It is a further object of the present invention to prevent curl when the material is mounted on a light box for inspection purposes.

[0016] Other objects will become apparent from the following description and examples.

SUMMARY OF THE INVENTION The above objects were achieved by providing, on one side of a subbed support, one or more light-sensitive silver halide emulsion layers overcoated with an outermost protective layer; A single-sided photosensitive silver halide photographic film material comprising a backing layer coated on the side with a protective outermost layer, wherein said emulsion layer is dispersed in a binder with silver halide grains (5 g / silver halide). are coated with total amount expressed as an equivalent amount of m ² or more silver nitrate), and in those containing latex polymer present in an amount of less than 30% by weight relative to the binder, at least said backing layer is at least one In one layer, in addition to the crosslinked or crosslinkable first binder, as a second binder,
An organic component that does not crosslink when reacted with a curing agent, wherein the organic component is a polymer selected from the group consisting of dextran having a molecular weight of 20,000 or less and polyacrylamide having a molecular weight of 20,000 or less. This is achieved by providing a material that does the same.

Specific features of preferred embodiments of the invention are disclosed in the dependent claims.

Further advantages and embodiments of the present invention will become apparent from the following description and the following examples.

DETAILED DESCRIPTION OF THE INVENTION While the invention will be described below in connection with preferred embodiments thereof, it will be understood that it is not intended to limit the invention to those embodiments. Disclosed herein is a single-sided photosensitive silver halide photographic film material, wherein according to the present invention there is one or more photosensitive silver halide emulsion layers, said emulsion layers being at least 5 g / m ² (eg at least 5 g / m ^2). .2 g / m ² ) with silver halide grains coated in a total amount, expressed as equivalents of silver nitrate, and dispersed in a binder. In a preferred embodiment of the present invention, the silver halide is at least 7.5 g / m ² , more preferably at most 10.0 g / m ^2.
Coated with the total amount, expressed as equivalents of g / m ² of silver nitrate.

[0021] In addition to the binder, the latex polymer is less than 30% by weight relative to the binder, more preferably 2% by weight.
It is present in the emulsion layer in an amount of less than 0% by weight, is coated only on one side of the subbed support and is protected by an outermost protective overcoat layer adjacent thereto. On the other side of the primed support there is a backing layer, which is coated with an outermost protective layer, and at least said backing layer is provided in at least one of its layers with an organic component which does not crosslink upon reaction with a curing agent. It is characterized by having. According to the present invention, the organic component which does not crosslink upon reaction with the curing agent is 1000
A polymer selected from the group consisting of dextran having an (average) molecular weight of ２０20,000 and polyacrylamide having an (average) molecular weight of 1,000 to 20,000. The organic substance that may be present is one selected from the group consisting essentially of pullulan and saccharose. It is recommended to use a polymer having a known molar distribution in which a high proportion of polymer components having a low molecular weight (less than 20,000) are present and a low proportion of polymer components having a high molecular weight (above 20,000). The (heterogeneous) molar distribution is determined by the manufacturing method, in particular by the shear parameters used therein during the synthesis.

In one embodiment according to the invention, in at least one of said backing layers of the material according to the invention, organic components which do not cross-link upon reaction with a curing agent are crosslinked or crosslinkable first components.
It should be present in an amount of at least 50% by weight, based on the amount of binder.

In a preferred embodiment according to the invention, said at least one layer of said backing layer of the material of the invention is a first layer of said backing layer which is closer to the subbed support than other layers.

The preferred crosslinked or crosslinkable first binder in the materials of the present invention is gelatin, well known as a hydrophilic protective colloid binder.

At least 20,000, more preferably 5
Polymers other than gelatin, such as polyacrylamide, polyvinyl alcohol, polyvinylpyrrolidone, and dextran, having a molecular weight of 0000 or more may be advantageously used, particularly in the photosensitive emulsion layer, for covering power after processing.

Other examples of binders that can be further used in the various layers of the silver halide recording material include vinyl alcohol, N-vinyl pyrrolidone, acrylamide, acrylic acid, methacrylic acid, vinyl imidazole, vinyl pyrazole. Stabilized by synthetic polymers such as made polymers or copolymers, casein, gelatin (made from bovine or pork skin and acid or alkali treated), cellulose and cellulose derivatives, alginate, albumin, starch and organic onium compounds Natural polymers such as modified colloidal silica, hydroxyethylcellulose, for example hydrolyzed gelatin chemically modified as described in US-A 5,087,694, for example DE
Modified polymers such as chemically modified hydrolyzed gelatin as described in US Pat. No. 2,166,605 and US Pat. No. 3,378,861. Mixtures of binders can also be used in the individual layers, in which case the preferred main component of the binder mixture or the only binder in the layer of the photographic recording material is gelatin. Preferred alkali-treated bovine bone gelatin as a binder in the emulsion layer and as a protective colloid used for the silver halide crystals can be ion exchanged. Preferably, the weight ratio of silver (expressed as silver nitrate equivalents) to binder or binder mixture in the photosensitive emulsion layer on one side of the subbed support is less than 0.7, more preferably 0.5 And produces low pressure sensitivity in the fully dry and wet state after processing. The ratio of this amount (both expressed by weight) may be established during the manufacture of the silver halide emulsion, for example by the amount of binder to be added to the amount of silver, the modification being the more binder This can be done before coating by the addition of materials.

According to the invention, the material is 0.5 to 5 g / m ^2.
Having one or more organic components that do not crosslink upon reaction with the curing agent. Portions of the binder material in the first or another backing layer do not crosslink upon reaction with the curing agent, while other portions are curable conventionally with various crosslinkers. The same applies, if desired, to the photosensitive emulsion layers on the other side of the support. In a preferred embodiment, the binder material which does not crosslink upon reaction with the curing agent is present in at least 1 g / m ² , preferably 2 g / m ² or more, more preferably 4 g / m ² or more in at least the (non-photosensitive) backing layer Exists. 1 g of binder material which otherwise would not crosslink upon reaction with the curing agent
/ M ² , and at most 4 g / m ^{2, in} an amount of at most 4 g / m ^{2 in} the photosensitive layer on the other side of the support.

Crosslinking agents suitable for use include, for example, Resear
ch Disclosure, No. 36544, September 1994, Chapter II, 5
It is described on page 08. The hardeners suitably used for the preferred gelatin binder are glutardialdehyde,
2,4-Dichloro-6-hydroxy-1,3,5-triazines, compounds containing an active vinyl group such as vinylsulfonyl hardeners as described in JP-B 95113745 or JP-A 10-325987. New sulfonamide- or sulfonate-substituted vinylsulfonyl curing agents as disclosed in US Pat.
Vinylsulfonyl-2-propanol or di- (vinylsulfonyl) -methane, vinylsulfonyl-ether compounds and vinylsulfonyl compounds having a soluble group and, for example, 1,3,5-triacryloyl-hexahydro-
Other active vinyl compounds such as s-triazines; halo-substituted formamidinium salts, carbamoyl ammonium or pyridinium salts as disclosed in US Pat. No. 4,063,952, onium compounds as disclosed in EP-A 0408143, JP- A carbonylpyridinium type compounds as disclosed in A 08-015802, JP
-A 08-111535 pyrrolidono-carbonylpyridinium salt curing agent, polymer curing agent,
Phosphates having a nitrogen-oxygen bond as in EP-A 0 688 842 and US Pat. No. 5,766,820
Organic curing compounds of the epoxy and ethyleneimine type, for example aldehydes such as formaldehyde, glyoxal and glutaraldehyde, for example N-methylol compounds such as dimethylolurea and methyloldimethylhydantoin, for example 2,3 −
Includes dioxane derivatives such as hydroxy-dioxane, active halogen compounds such as 2,4-dichloro-6-hydroxy-s-triazine, for example, mucohalic acids such as mucochloric acid and mucophenoxychloric acid.
In addition to organic hardeners, inorganic compounds such as chromium salts such as alum chromium and chromium acetate may be used. These curing agents can be used alone or in combination.

According to the present invention, the curing agent or compound is a vinylsulfonyl curing agent. A preferred example is EP
-A 029127,098454,0115351,
0207399, 0497143 and 0752615,
US-A 3,490,911; 3,583,339; 3628
961; 3832181; 4007163; 40575
38; 4396709; 4670377; 468025
7; 4897344 and 5071736. Suitable production methods for obtaining such vinylsulfonyl curing agents are described, for example, in EP-A 0 770 908.

The same applies to conventionally curable binder materials which are present in the other side of the support or in the light-sensitive silver halide emulsion layer, in which, in addition to said binder material, a latex The polymer is present in an amount less than 30% by weight, more preferably less than 20% by weight. Such latex polymers include, but are not limited to, vinyl chloride copolymers, vinylidene chloride copolymers, acrylic ester copolymers such as polyethyl acrylate, vinyl acetate copolymers and butadiene copolymers.

The light-sensitive emulsion layer of the material according to the present invention has the EP-A
Tabular habits and / or as disclosed in EP 0770909 and 0874275 (especially EP-A 06
10608, 0649051, 0712036 and 07
Photosensitive silver halide emulsion grains or crystals having a cubic habit (disclosed in US Pat. No. 94456). (For example, EP-A 0655645, 0866362, 0933)
670,0945754,0953867,09628
20, 1045282, 1045283 and EP application N
o.99204006,9920409,992040
Tabular habits of {100} and / or {11} (as disclosed in U.S. Pat. No. 5,583,972) and U.S. Pat.
It may have a 1｝ major surface. The halide composition is chloride,
Any one selected from the group consisting of bromide and iodide may be used. Provided that the relative amounts present are sufficiently compatible with the solubility of the mixed forms of silver halide in the crystals formed as known by those skilled in the art. Further dopants, for example Group VIII complex ions, in particular rhodium (as in EP-A 0897131, 0933670 and 0933371 and US Pat. No. 5,856,077), ruthenium (as in EP-A 1058150) and, for example, US-A 5089
379, 529532, 5368994 and 5420
001 (in this last document there is an epitaxial deposition on the crystal surface).

The halide ions may be further distributed homogeneously or heterogeneously over the crystal volume and may lead to a homogeneous or heterogeneous distribution throughout the emulsion crystal distribution. Furthermore, the morphological properties of the particles (for example EP-A 0
It may be homogeneous or heterogeneous (as disclosed in 911687).

In one example, the photosensitive emulsion layer of the material according to the present invention contains {111} tabular silver bromo (iodide) grains such as those described in US Pat. No. 5,595,864.
Said {111} tabular grains are crystals with two parallel {111} planes, which are at least equal to two, the diameter of a circle having the same area as these planes versus the thickness which is the distance between two principal planes. Ratio, an average equivalent crystal diameter of at least 0.5 μm, an average thickness of 0.06 to 0.30 μm, wherein the grains have a total projected area of at least 90% for all grains present. Occupy. Methods for precipitating tabular silver halide grains have been extensively described in the patent literature. 0.
A preferred method of providing a relatively narrow particle size distribution with a coefficient of variation of less than 30 is described, for example, in US-A 52906.
55. According to the invention, the silver halide emulsion exhibits a coefficient of variation of the percentage of the average crystal diameter of the silver halide distribution of less than 20% with hexagonal # 11.
It has tabular grains having a 1｝ crystal habit. The silver halide emulsions may consist of grains having chloride in combination with bromide or bromoiodide, but in an amount of at least 90 mol% bromide, up to 3 mol% average iodide content, more preferably up to 1 mol%. Tabular grain emulsions comprising silver iodobromide grains or silver bromide grains having an average amount of iodide are preferred. The iodide distribution can be homogenous throughout the crystal volume or it can be present in a so-called core-shell crystal structure, for example a silver halide crystal having distinct phases characterized by different iodide to bromide ratios. One or more shells can be present and it is recommended to have a phase rich in silver iodide by applying so-called conversion techniques during precipitation between the different phases. Iodide ions can be prepared by adding an aqueous solution of an inorganic salt of iodide such as sodium, potassium or ammonium iodide.
-A 0561415, 0563701, 056370
By adding organic compounds capable of releasing iodide ions as described in 8,0649052 and 0651284 or, for example, in EP-A 062
It can be provided by adding very fine silver iodide grains (so-called Lippmann emulsions having a grain diameter of less than 0.05 μm) as disclosed in US Pat. To increase speed, for example, EP-A
0348934, 0371338, 0407576, 0
It may be recommended to add applying reduction sensitization during precipitation as disclosed in 518323 and 0843209. In another example, for example, EP-A 09229
It is recommended to add a hole-trapping agent such as a Rongalit compound or formic acid or a salt thereof as disclosed in EP-A-106 and EP-A 1 406 401 during the shell precipitation.

In another example, the light-sensitive emulsion layers of the material according to the present invention are EP-A 0 610 608, 0610609, 0
{100} cubic silver bromo (iodide) grains such as those described in US Pat.
A cubic grains rich in silver chloride, such as those disclosed in A 0794456. Cubic particles having an average crystal diameter of 0.05 to 1.0 μm can be used depending on the desired concentration. 0.0 for laser applications
5 to 0.30 μm, more preferably 0.10 to 0.20
Very fine particles in the range of μm are preferred, for mammography particles having an average diameter of 0.30 to 0.90 μm, more preferably 0.30 to 0.70 μm are preferred for use.

Silver halide emulsions are described, for example, in "Chimie et Ph.
ysique Photographique ”, by P. Glafkides,“ Photog
raphic Emulsion Chemistry ”, GF Duffin,“ Ma
kingand Coating Photographic Emulsion ”, VL Zeli
kman et al. and “Die Grundlagen der Photographisch
en Prozesse mit Silberhalogeniden ", edited by H. Frieser and published by Akademische Verlagsgesellschaft (1968). As described in the literature, chemical sensitization involves the addition of small amounts of sulfur, Performed by performing ripening in the presence of a compound containing selenium or tellurium, such as thiosulfate, thiocyanate, thiourea, selenosulfate, selenocyanate, selenourea, tellurosulfate, tellurocyanate, sulfite, mercapto compound, and rhodamine. In a preferred example, these compounds are applied in combination with a noble metal salt, preferably a gold complex, but are disclosed in US Pat.
Platinum, palladium and iridium salts as described in No. 618061 may be used. The amount of gold (metallic gold) used for the chemical ripening of the emulsion according to the present invention is preferably in the range of 25 to 45 ppm based on the amount of metallic silver. The addition of sulfur and / or selenium and / or tellurium and gold may be performed continuously or simultaneously. In the latter case, gold thiosulfate, gold selenosulfate or gold tellurosulfate compounds are recommended. If desired, small amounts of Rh, Ru, Pb, Cd, Hg or Tl compounds can be added.

Further, a reductor such as a tin compound, an amine, a hydrazine derivative, a formamidine-sulfinic acid, and a silane compound as described in British Patent No. 789823 may be added as a chemical sensitizer. Chemical sensitization may include phenidone and / or a derivative thereof, hydroquinone, resorcinol, dihydroxybenzene and / or a derivative thereof such as catechol, one or more stabilizers or antifoggants, one or more spectral sensitizers or a combination of the above components. Can also be performed in the presence of

The silver halide emulsion can be spectrally sensitized by adding one or several cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, hemicyanine dyes, styryl dyes, hemioxonol dyes. it can. Preferred examples of suitable orthochromatic spectral sensitizers are 5,5'-dichloro-3,
3'-bis _(SO 3 -R) -9- ethylbenzamide oxy carbocyanine (R is n- propylene or n- butylene). Furthermore, JP-A 06/03510
4,06 / 035101,06 / 035102,62 /
191847, 63/249839, 01/31253
Green light absorption spectral sensitizers according to the formula given in US Pat. Nos. 6,03 / 200,246 and US Pat. The correct choice of the sensitizers or combinations thereof is always relevant for the purpose of obtaining the highest possible photographic speed while reducing dye stain after processing. Another overview of useful chemical classes of spectral sensitizers is
“The CyanineDyes and Related Compoun” by FM Hamer
ds ", 1964, John Wiley & Sons, and another example which is particularly useful for spectral sensitization of tabular grains is Resea
Given in rch Disclosure Item 22534. In addition, a recent overview is given in EP-A 0 575 285.

Traditionally, spectral sensitization is performed after completion of chemical sensitization. However, especially the spectral sensitization of tabular grains may be carried out simultaneously with or completely prior to the chemical sensitization step: spectral sensitizers are generally available in EP Application No. 99201190 (filed April 16, 1999).
Site-directors during the formation of sensitivity spots by chemical sensitization of tabular grains as described extensively in
It is generally recognized that they may act as such, thereby enhancing their photographic properties.

As is well known, the layer furthest from the support and containing no silver halide is designed as a protective layer. In addition to binders and surface-active substances, such protective layers can, if desired, also contain other substances which influence the chemical, physical and mechanical properties of the photographic silver halide recording material. Examples of these materials are lubricants, surfactants containing perfluoroalkyl groups, lattices (polymeric organic particles), fine particle colloidal crystalline silica dispersions, matting agents (spacers), curing agents, antistatic materials and preservatives. Agent. The binder coating weight is usually from 0.5 g / m ² to the protective layer.
2.0 g / m ² .

In the protective layer, especially on the photosensitive side, certain compounds, such as polythioethers as in EP Application No. 99204010 or EP Application No. 9920
Certain mercaptoazoles as in 4008 (both filed November 26, 1999) may be present. That application provides a solution to provide good image tone, high coverage, low residual color and a suitable constant sensitometry (good storage). For example, E
The presence of a fluorinated ionic surfactant in addition to the nonionic surfactants and inorganic salts as described in P-A 0 318 936 gives good image temperature in addition to suitable development temperature latitude and development.

The silver halide emulsions present in the materials according to the invention may further comprise compounds which stabilize the photographic properties or prevent the formation of high minimum densities during the manufacture or storage of the photographic material or during its photographic processing. Many known compounds can be added to a silver halide emulsion as fog inhibitors or stabilizers. Preferred examples are heterocyclic nitrogen-containing compounds, such as benzothiazolium salts, nitroimidazole, nitrobenzimidazole, chlorobenzimidazole, bromobenzimidazole, mercaptothiazole, mercaptobenzothiazole, mercaptobenzimidazole, mercaptothiadiazole, aminotriazole, Benzotriazole (preferably 5-methyl-
Benzotriazole), nitrobenzotriazole, mercaptotetrazole, especially 1-phenyl-5-mercapto-tetrazole, mercaptopyrimidine, mercaptotriazine, benzothiazoline-2-thione, oxazoline-thione, triazaindene, tetraazaindene and pentaazaindene Especially by Birr, Z. Wiss. Pho
t. 47 (1952), pages 2-58, GB-A
1203775 and GB-A 1209146, JP-
B 77/031738, and GB-A 150027
Triazolopyrimidines as described in 8 and 7-hydroxy-s-triazolo- [1,5-a] -pyrimidines as described in U.S. Pat. No. 4,727,017;
And other compounds such as benzenethiosulfonic acid, benzenethiosulfinic acid and benzenethiosulfonic acid amide. Other compounds that can be used as fog-inhibiting compounds are described in Research Disclosure No. 36544 (1994), Chapter VII.
It is described in. These fogging inhibitors or stabilizers can be added to the silver halide emulsion before, during or after ripening, and mixtures of two or more of these compounds can be used.

The photographic material according to the present invention may further comprise various types of surfactants in the photosensitive emulsion layer or in at least one other hydrophilic colloid layer. Suitable surfactants are saponins, alkylene oxides such as polyethylene glycol, polyethylene glycol / polypropylene glycol condensates, polyethylene glycol alkyl ethers or polyethylene glycol alkyl aryl ethers, polyethylene glycol esters, polyethylene glycol sorbitan esters, polyalkylene glycol alkylamines or alkyls. Nonionic agents such as amides, silicone-polyethylene oxide adducts, glycidol derivatives, fatty acid esters of polyhydric alcohols and alkyl esters of saccharides; anionic agents containing acidic groups such as carboxy, sulfo, phospho, sulfate or phosphate groups; Aminoalkyl sulfonic acid, amino alkyl sulfate or phosphate, Rukirubetain, and such amphoteric agents amine -N- oxides; and alkylamine salts, aliphatic, aromatic,
Or a heterocyclic quaternary ammonium salt, an aliphatic or heterocyclic ring-containing phosphonium or sulfonium salt, and Research D
isclosure 36544, September 1994, Chapter IX, part A, 51
Including cationic agents such as those disclosed on page 9. Such surfactants prevent or reduce adhesion for various purposes, for example, as coating aids, as antistatic compounds, as compounds that improve film transport in automatic film handling equipment, as compounds that facilitate dispersion emulsification, It can be used as a compound and as a compound that improves photographic properties such as high contrast, sensitization and development acceleration.

Acceleration of development may be useful, especially when rapid processing conditions are important, and include various compounds, preferably, for example, US Pat. No. 3,038,805;
75 and 4292400 can be achieved with the aid of polyoxyalkylene derivatives having a molecular weight of at least 400, such as those described in US Pat. Particularly preferred development accelerators are DE 2360878, EP-A 06346.
Polyoxyethylene containing repeating thioether groups as described in US Pat. The same or different development accelerators or mixtures of development accelerators may be added to the emulsion side of at least one hydrophilic layer. A hydrophilic colloid in or in a water permeable relationship with a photosensitive silver halide emulsion layer by a suitable amount of dextran or a dextran derivative to improve the abrasion resistance in wet conditions in addition to the covering power of the formed silver image It is advantageous to partially replace the hydrophilic colloid binder of the layer, preferably gelatin.

The photographic material of the present invention is a Research Disclosure
36544, September 1994, Chapter IX, part B, C and D, 519-
Compounds for improving the dimensional stability of the photographic material as disclosed on page 521, and various other additives such as UV absorbers, spacing agents, lubricants, plasticizers, antistatic agents and the like may also be included. Additives suitable for improving dimensional stability include, for example, water-soluble or poorly water-soluble synthetic polymers such as alkyl (meth) acrylates, alkoxy (meth) acrylates, glycidyl (meth) acrylates, (meth) acrylamides, vinyl esters Of acrylonitrile, olefin, and styrene, or of the above with acrylic acid, methacrylic acid, α-β-unsaturated dicarboxylic acid, hydroxyalkyl (meth) acrylate, sulfoalkyl (meth) acrylate, and styrene sulfonic acid Copolymer).

Suitable UV absorbers are, for example, US-A 3
Aryl-substituted benzotriazole compounds as described in 533794, US-A 3,314,794 and 3352
No. 681, 4-thiazolidone compounds, JP-
A benzophenone compounds as described in A 2784/71, cinnamic acid ester compounds as described in U.S. Pat. Nos. 3,705,805 and 3,707,375, U.S. Pat.
229, and US-A
Benzoxazole compounds as described in No. 3700455.

In general, the average particle size of the spacing agent is 0.1.
2 to 10 μm. Spacing agents can be soluble or insoluble in alkali. Alkali-insoluble spacing agents usually remain permanently in the photographic material, while alkali-soluble spacing agents are usually removed in an alkaline processing bath. Suitable spacing agents can be made, for example, from polymethyl methacrylate, from copolymers of acrylic acid and methyl methacrylate, and from hydroxypropyl methylcellulose hexahydrophthalate.
Another suitable spacing agent is US-A 4,614,708.
It is described in.

Compounds which can be used as plasticizers for the hydrophilic colloid layer are polyols or acetamides such as trimethylolpropane, pentanediol, butanediol, ethylene glycol and glycerin. Furthermore, the polymer latex is preferably mixed into the hydrophilic colloid layer for the purpose of improving pressure resistance,
For example, a homopolymer of an acrylic acid alkyl ester or a copolymer thereof and acrylic acid, a copolymer of styrene and butadiene, and a copolymer or a homopolymer of a monomer having an active methylene group.

The photographic materials may contain an antistatic layer to avoid electrostatic discharge during coating, processing and other handling of the material. Such an antistatic layer may be an outermost coating, such as a protective or after layer, or a layer of one or more antistatic agents or a coating applied directly to a film or other support and overcoated with a barrier or gelatin layer. You may. Suitable antistatic compounds for use in such layers are, for example, vanadium pentoxide sol, tin oxide sol or conductive polymers such as polyethylene oxide or polymer latex. Particularly preferred antistatic polymers which provide permanent conductivity are EP-A 0 602 713 and 06-2856.
0 is a polyethylene dioxythiophene polymer.

A common support for photographic silver halide materials used in the imaging method according to the present invention is a hydrophobic resin support. Hydrophobic resin supports are known to those skilled in the art, for example, polyester, polystyrene, polyvinyl chloride, polycarbonate, and Research Disclosure 36544, September 1994.
Made from what was given on the Moon, Chapter 15, p. 531,
Preferred are polyethylene terephthalate and polyethylene naphthalate.

[0050] The hydrophobic resin support may be provided with one or more subbing layers known to those skilled in the art to adhere the hydrophilic colloid layer. Suitable subbing layers for polyethylene terephthalate supports are described, for example, in US-A 3,397,988,
3649336, 4123278 and 4478907. For example, EP-A 0169039,0
Colored supports such as those disclosed in 790526 and 0844520 may be advantageously used for image toning.

The coating of the different layers of the photographic material of the present invention may be performed according to any of the known techniques for applying photographic coatings. In particular, current slide hoppers, especially sink coating techniques, apply. To increase coating speed and / or reduce coating thickness when using flow coating,
Known polyacrylamides for increasing the shear viscosity can be added to the coating composition of the emulsion layer and / or the protective stress-resistant layer. Suitable polyacrylamides are copoly (acrylamide- (meth) acrylic acid), such as copoly (acrylamide-acrylic acid-sodium acrylate) (87.5: 4.1: 8.4), especially the commercial product R
ROHAFLOC SF710 and ROH from OHM
AFLOC SF580. These polyacrylamides are preferably used in the coating composition of the stress-resistant layer in an amount of from 10 to 500 ppm, the coating being carried out simultaneously with the emulsion layer by flow coating. In this way the thickness of the emulsion layer can be reduced and coating can be performed at increased speed.

The material according to the invention is in a preferred example a mammographic film material. The silver halide grains present in the mammography film are spectrally sensitized to optically detect the light emitted from the x-ray conversion screen. Preferred mammography film is measured by the emission maximum of the X-ray conversion screen when m ² per 5-8
It is characterized by a spectral sensitivity in the range of 0 microjoules. The spectral sensitivity is defined herein as the exposure at a given wavelength required to obtain an optical density Dmin + 1.0 after processing. In actual mammography applications, mammograms are obtained by subjecting a film-screen system to X-ray exposure.
In diagnostic imaging, commercially available X-ray generators that provide exposure to soft X-rays having a tube voltage of 20-40 kV may be used. Preferred luminescent phosphor coated in the X-ray conversion screen is _Gd 2 _O 2 S: a Tb, which emits green light in the wavelength range of 540-555nm. Said phosphors and their use in intensifying screens are described in the patent literature, for example US-A 3,872,309; 41.
30429; 4912333; 4925594; 499
4355; 50213327; 5107125 and 525
9016 and GB 1489398. Phosphor screens with emission spectra in other wavelength ranges, for example in the blue spectrum, are also applicable. The thickness of the phosphor layer depends on the amount of coated phosphor required to obtain the desired screen speed. Preferred intensifying screens used in the method according to the invention are EP-A
At least 97: 3 as described in 0712036
And a phosphor coating weight of at least 45 mg / cm ³ .

In order to obtain satisfactory image resolution, the mammographic film must have a transparent support (typically 17
(A blue polyethylene terephthalate film having a thickness of 5 μm) on one side only, comprising one or more light-sensitive silver halide emulsion layers. One or more subbing layers may be coated directly on the support to improve the adhesion of the emulsion and backing layer to the support. Further, an undercoat layer may be present between the emulsion and the undercoat layer. Additional non-light sensitive interlayers containing dyes, for example to provide suitable image resolution, can also be selected.

Said dyes, which have no spectral sensitizing activity by themselves, or certain other compounds which do not substantially absorb visible radiation, have a supersensitizing effect when incorporated into emulsions together with said spectral sensitizers. Can have. Suitable supersensitizers are, for example, US-A 345707.
Heterocyclic mercapto compounds containing at least one electronegative substituent as described in US Pat.
-A 2933390 and 3635721 nitrogen-containing heterocyclic ring-substituted aminostilbene compounds, for example aromatic organic acid / formaldehyde condensed compounds and cadmium salts and azaindene compounds as described in US-A 3,743,510.

At least one non-spectral sensitizing dye, known as a "filter dye", can be added to one or more non-photosensitive hydrophilic layers, such as a backing layer, or to the emulsion layer. The presence of such dyes in an adaptive amount is recommended not only to adjust the sensitivity and resulting contrast required of the different emulsion layers, but also to reduce the scattering of exposure radiation and thus enhance sharpness (so called "antihalation"). Dye "). Preferred dyes are those that are easily removed from the photographic material during wet processing to leave no residual color. When the dyes are added to the emulsion side, it is preferred that these dyes cannot diffuse into the coating of the hydrophilic layer. Examples of such dyes include, but are not limited to, for example, US-A 3,560,214; 3,647,460;
88534; 4311787 and 4857446. These dyes are less than 10 μm, more preferably less than 1 μm, even more preferably 0.1 μm.
It may be added to the coating solution as a solid particle dispersion of a water-insoluble dye having an average particle diameter of less than m. Examples of such dyes are described in EP-A 0 384 633; 0351593;
586748; 0587230 and 0656401, E
PA 0323729; 0274723 and 0276
566, and US-A 4900653; 490456.
5; 4949654; 4940654; 494871
7; 4988611; 4803150 and 534474
9 is disclosed. The dye is EP-A05690.
74, it can also be added in the form of a solid silica particle dispersion. Yet another technique applied to obtain ultrafine dye dispersions consists in acidifying the slightly alkaline coating composition "in situ" just prior to coating on the support layer. A recent study of the dispersion method is EP-A
0756201.

According to the present invention there is provided a photographic material comprising a support and thereon one or more hydrophilic photosensitive layers on at least one side, wherein at least one of said layers is as previously disclosed. Silver halide emulsions. Particularly for mammographic applications, the photographic material comprises only one hydrophilic photosensitive layer comprising an emulsion as disclosed herein on only one side of the support, wherein the photosensitive tabular grains are provided. Has a coverage of 5.0-9.0 g / m ² , expressed as silver nitrate.

Mammographic materials are particularly suitable for use in mammographic diagnostic applications, and therefore according to the present invention there is provided a radiographic image for obtaining a diagnostic image for mammography, said method comprising the following steps: Including: (i) converting the photographic material as disclosed above to radiographic X
Film by contact with a line conversion screen
Configuring the screen system; (ii) subjecting the film-screen system to exposure with X-rays emitted from an X-ray generator having a tube voltage of 20 kV to 40 kV; (iii) developing, fixing, rinsing or washing and The photographic material is processed for a total processing time from drying to drying of from 38 seconds to 210 seconds, more preferably from 45 seconds to 130 seconds, depending on the drying step.

The configuration usually used in the processing apparatus shows a continuous tank unit corresponding to a developer-fixer-rinse water as a continuous solution. However, recent developments have shown that the order of developer-fixer-fixer-rinse-water-rinse-water as a continuous solution is preferred from an ecological point of view and in particular with regard to the reduction of replenishment. One washing step between development and fixing and one washing step at the end before drying may be present.

Since ecologically low replenishment is a major problem with the present invention, concentrated hardener-free processing solutions are used in one package. Examples are disclosed, for example, in US-A 5,187,050 and 5,296,342.

Particularly preferred developers containing ecologically acceptable developing agents such as ascorbic acid and its derivatives are EP-A 0732619 and US-A 5,236,681.
6,55593817 and 5604882. (Iso) ascorbic acid, 1-ascorbic acid and tetramethylreductin instead of or partially (e.g. a weight ratio of 1: 1 to 9: 1) for the ecologically problematic "hydroquinone" Acids are preferred as the main developing agent in the developer. The developing agent is EP-A0
461783, 0498968, 0690343, 06
96759,0704756,0732619,073
1381 and 073382, US-A 5,474,879
And 5498511 and Research Disclosure No. 37
1052, issued March 1, 1995,
There, a general formula covering the formula of the developing agent is represented. Particularly preferred developers for reducing the "sludge formation" provided by solubilizers, such as sulphite, which are present in the developers as preservatives are, for example, EP-A 08
51282 and EP-A 0992845 and 1006
It contains a reduced amount of ascorbic acid and sulfite, which acts as an antioxidant and main developer, referred to as a "low sludge" developer as described at 401.

For ecologically favorable settlement, the presence of aluminum ions should be reduced, and more preferably no aluminum ions should be present. It is also preferred in the absence of "sludge" formation, a phenomenon that leads to pi-line defects when high amounts of silver are coated on the photosensitive layer. Means for reducing "sludge formation" are further described in US-A 54
47817, 5462831 and 5518868. Particularly preferred fixing solutions contain less than 25 g potassium sulphite per liter in the absence of acetic acid, said fixing solution being used in order to render the fixing solution almost odorless as indicated in EP-A 0 908 764. It has a pH value of at least 4.5.

However, for whatever reason, if aluminum ions are present in the fixer composition,
EP-A 0620 indicates the presence of an α-ketocarboxylic acid compound
483,0726491 and RD No.16768 (19
(Issued March 1978).

Sodium thiosulphate can be used as a fixing agent, thus avoiding the commonly used ammonium ions which are ecologically undesirable. Fixation times reduced to about 2 to 10 seconds can be achieved for low coverage chloride-rich emulsion crystals. Furthermore, regeneration is kept to a minimum, especially in the processing of materials coated from very low amounts of silver chloride-rich emulsion crystals. A preferred minimum regeneration or replenishment rate is ² per m ² of developed material.
It is 0-200 ml, more preferably 20-100 ml, even more preferably 20-50 ml. Materials coated from higher amounts of silver require higher amounts of replenisher, but in many practical cases m
Achievable with a replenishment volume of less than 200 ml per ² .

The replenishment of the developing solution containing ascorbic acid or a derivative thereof and a 3-pyrazolidone derivative is described in EP-A05
73700, wherein the photographic material is developed in a continuous and automatic manner with a developer containing an ascorbic acid analog or derivative and a 3-pyrazolidone derivative as a developing agent, having a higher pH than the developer. Disclosed is a method for processing an imagewise exposed silver halide photographic material with a certain activity comprising the step of replenishing the developer with at least one replenisher. Alternatively, the replenisher is added as a powder. Other documents related thereto are EP-A 0552511; US-A 5
503965 and EP-A 0660175, which describe a method of replenishment control. The preferred minimum regeneration or replenishment rate for the fixer is m ^{2 of the} developed material.
About 20-200 ml, more preferably 20-10
0 ml, even more preferably 20-50 ml.
When aluminum ions are present in the fixing solution to perform the curing, the pH of the fixing solution is adjusted to 4.2 to 4 in order to obtain the highest curing reactivity and to suppress the swelling with the washing water in the washing or rinsing step. It is necessary to adjust to the range of 0.6. For cured materials having a hydrophilic layer swelling degree of less than 250%, more preferably less than 200%, the fixer pH is kept constant in the pH range of 4.2 to 4.6 as described above. It is not required to do so: it is recommended to increase the pH to a value between 4.65 and 5.00 to reduce the pungent odor from the sulfite ions in the aqueous acidic medium leading to sulfur dioxide vapor. A method for keeping the quality of the fixer at an optimum level is described in EP-A-0 877 264.

Although any processing unit adapted to the above conditions can be used to achieve the goal of a complete connection between rapid processing and ecology, the invention relates to processing. Are realized, for example, in the processing unit CURIX HT 530 (trade name sold by Agfa-Gevaert).

[0066]

EXAMPLE 1 Preparation of a silver halide containing layer: Preparation of a cubic grain emulsion 15 g of methionine and 5 adjusted to a pH of 5.8.
A 2.94 M solution of AgNO ₃ at a constant flow rate of 5.7 ml / min for 5 seconds and a constant pAg of 7.8 are added by double jet addition at 60 ° C. to 1 l of solution containing 0 g of gelatin. At a controlled flow rate of 2.9
A solution of a mixture of 1 M KBr and 0.03 M KI was added. The flow rate of the AgNO ₃ solution was then increased temporarily to 21 ml / min in 72 minutes and 46 seconds. The cubic particles thus obtained comprise 99 mol% ABr and 1% based on silver.
It consisted of mol% AgI and had an average particle size of 0.63 μm. After washing, gelatin and water were added to give a silver halide content of 208 g / kg, expressed as AgNO ₃ , and a gelatin content of 89 g / kg.

The pH of this emulsion was adjusted to 6.0.
To 2.4 kg, 6 mg of sodium thiosulfate, 1.46
× 10^-3M chloroauric acid and 1.58 × 10^-2M's
70 ml of a solution containing ammonium thiocyanate,
4.76 × 10 in methanol ^-3M thiosulfonic acid
2 ml solution of sodium toluene and 38 mg of sulfite
Sodium acid was added continuously. This mixture is 46 ° C
For 4 hours. After cooling, the preservative was added.

The following additives were added to the silver bromide-rich silver halide emulsion per mol of silver halide: 375 mg of 5,5'-dichloro-3,3'-bis (n-butyl-4- Sulfonate) -9-ethylbenzoxacarbocyanine, anhydrous triethylammonium salt; -785 mg of 4-hydroxy-6-methyl-1,
3,3a, 7-tetraazaindene; 15.5 g of sorbitol; 12 g of polyethyl acrylate, latex as plasticizer; 2.8 g of resorcinol; 160 mg of potassium bromide; 33 g of polydextran (molecular weight = 1000
0).

Composition on protective layer emulsion side (amount expressed in g / m ² ): -Gelatin: 1.1-Polymethyl methacrylate spacing agent (average particle size: 3 μm): 0.015-Chromium acetate: 0 .005 - 4-hydroxy-6-methyl-1,3,3a, 7- _{tetrazaindene: 0.082 - CF 3 (CF 2} ) 6 COOHNH 3: 0.007 - CF 3 (CF 2) 6 CONH ( _{CH 2 CH 2 O) 17-20:} 0.019 - phenol: 0.150 - Mobilcer Q (a paraffin wax, trade name from MOBIL OIL): 0.025 - formaldehyde (added just before coating): 0.100

Composition (g / m ² ) of first backing layer containing polymer as anti-curl and anti-halation dye : -Dye 10.08-Gelatin: as shown in the experimental table-7 to 10 nm Silica particles having an average particle size of: 2.28-dextran or polyacrylamide: the amount indicated in Table I

Embedded image

Composition of protective layer 2 (g / m ² ): -Gelatin: 0.54-CF ₃ (CF ₂ ) ₆ COOHNH ₃ : 0.007-Glyoxal: 0.10-Polymethyl methacrylate particles (diameter 7 μm) 0.023

[0072] emulsion layer containing a coated silver halide material (EL) and the protective layer 1
(PL1): The coating solution for the silver halide containing layer was prepared by adding a solution of the compound shown above to the melted emulsion with stirring.

The coating solution of the protective layer 1 was obtained by dissolving the above indicated composition per m ^{2 of} deionized water. After adjusting the pH to a value of 6.7, the viscosity and surface tension of the coating solution were optimized to obtain an undisturbed coating distribution. The emulsion layer and the protective layer were simultaneously coated by conventional coating techniques on one side of a primed polyester support having a thickness of 175 µm.

After coating, the emulsion layer contained 8.8 g of silver, 3.77 g of gelatin and 0.6
2 g of polyethyl acrylate latex (corresponding to an amount of latex of 16% by weight with respect to gelatin) (m
² ).

The first back layer (BL1) and the protective layer 2 (PL
2): The coating solution of the first backing layer is 5 / m ^{2 of} deionized water.
Dissolve 0 ml of the above indicated coating composition and adjust the pH to 6.
It was obtained by adjusting to a value of 2.

The coating solution of the protective layer 2 (PL2) was obtained by dissolving the above indicated coating composition at 19 ml / m ^{2 of} deionized water and adjusting the pH to a value of 6.2.

Both layers were simultaneously coated on a 175 μm thick polyester support or undercoat as described above: the protective layer 2 (PL2) was both on the opposite side of the emulsion layer (EL) from the support. Farther and the first backing layer (BL
Adjacent to 1).

The material was then dried under controlled conditions of heat and relative humidity.

The material was cut into 18 cm × 24 cm samples.

Processing: Glutaraldehyde-containing hydroquinone / 1-phenyl-3-pyrazolidone developer, followed by aluminum-containing fixing solution (Agfa-Gev, respectively)
Trade names G138 (R) and G by aert NV
334®).

The product CURIX 5 of Agfa-Gevaert NV
30 (registered trademark) was used as an automatic processor. The processing order and conditions in the CURIX 530® processor are as follows (expressed in time (seconds) plus temperature (° C.)): loading: 3.4 seconds development: 23.4 Sec / 35 ° C. Developer G138® Crossover: 3.8 sec Fixing: 15.7 sec / 35 ° C. Fixer G334® Crossover: 3.8 sec Rinse: 15.7 sec / 20 ° C. Drying: 32.2 seconds (including crossover time) -------- Total time: 98.0 seconds

For curl applied to one side coating material
Before processing the sample of the measurement technology material under the above processing conditions ("BP")
And after treatment (“AP”). The material was exposed to white light before processing.

[0083] Larger than 10cm x 10cm and 24c
Film sheets having a total surface area of less than mx 30 cm (each unexposed, untreated film and exposed, treated film) were evaluated as follows.

The sheets were hung on a drying frame for at least 4 hours in a conditioning room (20 ° C./10% RH).

The curl was measured according to ISO 4330: curl in the direction of the emulsion was indicated by the letter “E” and in Table I by the “+” sign, while curl in the direction of the backing layer was indicated by the letter “ B "and"-"in Table I.

The numbers given in Table I below correspond to the reciprocal of the measured curl radius expressed in meters (measured according to ISO 4330). The larger the number, the greater the degree of curl (the smaller the curl radius, the stronger the curl).

Backing layer with respect to binder content (protective stress-resistant coating as outermost layer and first layer in contact with the subbed support)
Important additions for the composition of the backing layer) and the curl effect are given in Table I.

In this example, the amount of gelatin is given
You. All quantities in Table I below are in g / m ²Given by

[0089]

[Table 1]

A gelatin content of 4.9 g / m ² results in a flat material before processing, but after processing a strong curl on the back side of the material. Embodiments having latex in the first backing layer reduce curl to a good level after processing, but have very high curl properties before processing.

On the other hand, Sample No. 3 of the present invention is Sample No.
Compared with Sample No. 4, both produced the desired relatively low curl before treatment, but Sample 3 coated with dextran having an average molecular weight of 10,000 gave better results than Sample 4 after treatment, Matches.

Example 2 The experimental conditions were the same as those described in Example 1, except for the composition of the first backing layer. Silica particles are not present and 100
The amounts of dextran and gelatin having an average molecular weight (MW) of 00 are summarized in Table II below along with the curl data evaluated in the same manner as in Example 1.

[0093]

[Table 2]

The difference in curl before and after treatment (ΔBP-AP) clearly decreases when dextran is coated in an amount of 0.5 g / m ² or more. Addition of dextran having a low molecular weight (10000 as given in the present example) to the first backing layer, before and after treatment at low relative humidity, especially when dextran is present in an amount of at least 50% by weight with respect to gelatin. A one-sided coating material with a low curl level is obtained.

Having described preferred examples of the invention in detail,
It will be apparent to those skilled in the art that numerous changes may be made therein without departing from the scope of the invention as defined in the appended claims.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Francis van Ud Septegrat, Mortzeal, Belgium 27 Inside Agfa Geverth Namloze Bennoutchap (72) Inventor Frank Lutin, Septegrat 27, Belgium In Agfa Geverd Namroze Bennoutchap (72) Inventor Guy Daman Septetrat, Mortzeel, Belgium 27 In Agfa Geverd Namroze Bennoutchap F-term (reference) 2H016 AA02 AG00 2H023 AA01 FA09

Claims (5)

[Claims] 1. On one side of a subbed support, one or more light-sensitive silver halide emulsion layers coated with an outermost protective layer, and on the other side of said support an outermost protective layer. A single-sided photosensitive silver halide photographic film material comprising a backing layer coated with a protective layer, wherein said emulsion layer is comprised of silver halide grains dispersed in a binder, wherein said silver halide is at least 5 g / m ² . Coated with a total amount expressed as equivalents of silver nitrate), and-a latex polymer present in an amount of less than 30% by weight relative to the binder, wherein at least the backing layer is at least one of its layers. Wherein, in addition to the crosslinked or crosslinkable first binder, an organic component which does not crosslink upon reaction with a curing agent is provided as a second binder, said organic component having a molecular weight of 20,000 or less. And a polymer selected from the group consisting of polyacrylamide having a molecular weight of 20,000 or less. 2. The material according to claim 1, wherein the organic component which does not crosslink upon reaction with the curing agent is present in an amount of 0.5 to 5 g / m ² . 3. In at least one of said backing layers, an organic component which does not crosslink upon reaction with said curing agent is present in an amount of at least 50% by weight, based on the amount of the crosslinked or crosslinkable first binder. 2. The method according to claim 1, wherein the element exists.
Or the material according to 2. 4. The silver halide has a maximum of 10.0 g / m 2.
4. Material according to claim 1, wherein the material is coated in an amount expressed as an equivalent of up to ² silver nitrate. 5. A method for obtaining a diagnostic image for mammography comprising the steps of: (i) contacting a photographic material according to claim 1 with a radiographic X-ray conversion screen to form a film. Configuring the screen system; (ii) subjecting the film-screen system to exposure with X-rays emitted from an X-ray generator having a tube voltage of 20 kV to 40 kV; (iii) developing, fixing, rinsing or washing and The photographic material is processed for a total processing time from drying of 38 seconds to 210 seconds depending on the drying step.