DE1597541A1 - Use of alkali salts of polybasic organic acids containing at least one hydroxyl group as oxidation inhibitors in the development of photographic materials - Google Patents

Description

Eastman Kodak Company, 3 ^ 3 State Street, Rochester, New York State, United States of America

Use of alkali salts polybasic, at least one Organic acids containing hydroxyl groups as oxidation inhibitors in photographic development

materials

It is known that photographs are used before developer connections are sensitive to oxidation. For example, developer compounds a photographic material for diffusion transfer process incorporated, it easily comes to a due to air oxidation of the developer compounds Decrease in the rate of development, thereby reducing the value of the process.

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It is therefore also known to the photographic materials So-called oxidation inhibitors for the developer compounds, namely sulfites, usually sodium sulfite, to be added. The use of sulfites as antioxidants is however, they have certain disadvantages, since the sulfites have a dissolving effect on silver halides.

U.S. Patent 3,312,550 also includes photographic ones Materials known which, apart from a 3-pyrazolidone developer compound, additionally either a polyhydroxybenzene or ascorbic acid as an auxiliary developing agent contain. In the absence of an antioxidant however, these photographic materials can only be stored for a very short time. However, such photographic If a sulphite is incorporated into elements as an oxidation inhibitor, the sulphites become soluble as a result of their ability to dissolve for silver halides such areas were also developed which should not be developed.

Furthermore, when performing a reverse transfer process, sulfite tends not to affect the silver halide in the exposed areas before development has taken place. This leads to a concealment of the .Positive image transferred to the receiving sheet.

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The object of the invention was to provide oxidation inhibitors for

.id
Specify 3-pyrazollone developer compounds and auxiliary developer compounds used with them, which do not have disadvantages inherent in the sulfites.

The invention was based on the knowledge that alkali salts polybasic, at least one hydroxyl group containing organic acids excellent oxidation inhibitors of the desired type.

The invention therefore relates to the use of Alkali salts of polybasic organic acids containing at least one hydroxyl group together with a) one 3-pyrazolidone developer compound and b) an auxiliary developer compound, consisting of ascorbic acid, an ascorbic acid derivative or a mixture of at least 50 wt .- ^ ascorbic acid or an ascorbic acid derivative and a polyhydroxybenzoi as oxidation inhibitors in development photographic. Materials.

The inventive use of alkali salts polybasic organic acid is not related to the use of alkali salts known from US Pat. No. 3,260,598 confound. In the known development process

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the alkalinity required for development can be achieved by mixing an alkali metal salt with a slightly brings water-soluble metal hydroxide into contact. Some of the alkali metal salts suitable for carrying out the known process correspond to the alkali metal salts used as oxidation inhibitors according to the invention. With the well-known Process uses a variety of different developer compounds used. In addition, sulfite is used as an oxidation inhibitor in the known process . The alkali metal salts used in the known process are thus only used in connection with a metal hydroxide to free alkali ions to put.

The stabilized by one of the oxidation inhibitors in the present invention * used developing agents, namely, 3-pyrazolidone compounds, together with ascorbic acid or a mixture of at least 50 wt -.% Ascorbic acid and a polyhydroxy benzene, may exist in the form of a developing solution are used and incorporated in photographic elements that are ζ. B. suitable for performing chemical transfer processes, in the form of a so-called developer layer *

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Those used according to the invention as oxidation inhibitors Alkaline salts of polyvalent, at least one hydroxyl group containing organic acids develop a particularly good 'effect, if in the developer solutions or layers, a saccharide is also present. According to the invention Oxidation inhibitors used prevent a decrease in the activity of the developer as well as a Loss of sensitivity of the photographic material during Preserve and protect these from obscuration and undesired development, such as those caused by the well-known oxidation inhibitors be evoked.

The alkali metal salts of polybasic, at least one hydroxyl group used according to the invention as oxidation inhibitors containing organic acids are developers which use a 3-pyrazolidone developer compound and as an auxiliary developer compound per millimole of 3-pyrazolidone developer

expedient
binding / 0.05 to 13 g of ascorbic acid or a mixture of at least 50 wt .- ^. Ascorbic acid and a polyhydroxy J? - benzene, preferably incorporated in such an amount that 0.3 to 60 g of an oxidation inhibitor are added to one millimole of the ^ -pyrazolidone developer compound.

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Preferably contain those stabilized according to the invention Developer mixtures a saccharide such. B. sucrose or

15th
Raffinose, in amounts from 0.X® to 30 g per millimole of 3-pyra-

zolidon developer compound.

The use of the alkali metal salts has proven to be particularly advantageous and ammonium salts of hydroxylated, polybasic, organic acids, such as the use of Alkali metal or ammonium salts of tartaric acid and / or citric acid, proven.

Under a hydroxylated, polybasic, organic acid is to be understood as an organic compound which has more than one -COOH group and at least one hydroxyl (-OH) group per molecule contains.

As alkali metal salts, the salts are referred to here, which differs from potassium, sodium, lithium and other alkali metals from group I of the periodic table and from the ammonium group derive. This also includes mixed salts, such as sodium potassium tartrate and the like.

Typical examples of oxidation inhibitors according to the invention Usable alkali salts are: sodium citrate, potassium citrate, Ammonium citrate, sodium tartrate, potassium tartrate,

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Sodium potassium tartrate and ammonium tartrate. It can too Mixtures of these salts can be used. However, sodium citrate and sodium citrate are preferred as oxidation inhibitors Sodium tartrate used.

The 3-pyrazolidone developer compounds unfold in the frame chemical transfer processes have a unique activity, which cannot be achieved by other silver halide developer compounds Transfer process, for example, uses other developer compounds, such as Monome thy1-p-aminophenol one only has weak silver images

The auxiliary developer connections serve to increase the amount of 3-pyrazolidone developing agent necessary for effective development to control. The combinations of developer compounds used have the additional advantage of that they provide colorless oxidation products, which is why it only-to no or at most only minimal staining comes·

3-PyrazQliäonentwieklerverbindungen, which according to the invention can be stabilized by the oxidation inhibitors described and, as already mentioned, in the form of

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. . Winding solutions or in the form of so-called developer layers can be used in photographic materials are, for example, those of the general formula:

where mean:

R _{1 is} an optionally substituted alkyl radical having 1 to 12 carbon atoms, an optionally substituted benzothiazolyl radical or an optionally substituted aryl radical of the benzene or naphthalene series;

R ₂ , R. ,, Rj. And Β. in each case a hydrogen atom, an optionally substituted alkyl radical having 1 to 13 carbon atoms or an optionally substituted aryl radical, for example a phenyl or naphthyl radical, and

Rg is a hydrogen atom, an alkyl, acyl or aryl radical.

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Suitable 3-pyrazolidone compounds are, for example; -l-phenyl-3-pyrazolidone; l-p-tolyl-3-pyrazolidone, 1-phenyl-4-methyl-3-pyrazolidone, 1-phenyl-4,4-dimethyl-3-pyrazolidone and 1-p-chlorophenyl-3-pyi'azolidone. Further suitable 3-pyrazolidone compounds are e.g. U.S. Patent 3,312,550.

In a finished developing solution are the 3-pyrazolidones « developer compounds expediently in concentrations of 1.5 10 "^ to 30 χ 10 moles per liter of solution.

As an auxiliary developing agents, apart from d- and 1-ascorbic acid derivatives are suitable Ascorbinsäurej example, erythorbic acid, ascorbic acid derivatives IminoglucosSascorbinsäure soviie the specified in the US Patent 2 688 5kB.

For coordination with ascorbic acid or ascorbic acid derivatives Polyhydroxybenzenes suitable as auxiliary developer compounds are, for example:

Hydroquinone, catechol, chlorohydroquinone, pyrogallol, bromohydroquinone, Isopropylhydroquinone, Toluhydroquinone, Methyliiyclroquinone, 2,3-dichlorohydroquinone, 2,5-dimethylhydroquinone,

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2,3-dibromohydroquinone, 1,4-dihydroxy-2-acetophenone-2,5-dI-methy! Hydroquinone, 4-phenylcatechol, 4-phenethylcatechol, 4-phenpropylcatecholj 4-t-butylcatechol, 4-n-butylpyrogallol, 4,5-dibromeatechol, 2,5-diethy! Hydroquinone, 2,5-di-p-phenethylhydroquinone, 2,5-dibenzoylamino hydroefoinone, 2,5-Dipheny1-3 »6-dibenzy / hydroquinone, 2,5-diacetaminohydrochinone and the like ... Esters of these compounds, such as Forraiate and Acetate, ferden used

The stabilized according to the invention by an oxidation inhibitor Developer mixtures develop a particularly good effect when they are used in a light-sensitive photographic Element are incorporated. The photographic material may e.g. B «from a carrier with one applied to it There are silver halide layers, which per mole of silver a) 12.5 to 250 g of 3-pyrazolidone developer compound, b) 7.5 to 150 g of one made from ascorbic acid, an ascorbic acid derivative or a mixture of at least 50% by weight of ascorbic acid and an auxiliary developing agent consisting of polyhydroxybenzene and c) 125 to 2500 g of one from one Alkali metal or ammonium salt of a hydroxylated, polybasic, contains organic acid existing oxidation inhibitor. The silver halide layer of such photographic Elements is preferably a silver alloy emulsion layer.

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The stability of the Emulsion layer can be further improved. Another effect of the saccharides, especially the non-reducing ones Oligosaccharides, such as sucrose or raffinose, consists in their ability to increase the development activity of the ^ -pyrazolidone developer compounds, alone or in combination with auxiliary developer compounds.

Suitable saccharides are, for example, fructose, glucose, Inulin, keleeitose, pectin, raffinose, starch, sucrose and Trehalose «The non-reducing ones are particularly suitable Oligosaccharides such as sucrose and raffinose. The term "non-reducing" is used as it is for saccharides Meaning, d. H. that these non-reducing compounds Belong to a class of saccharides, the alkaline metal salt solutions, such as copper salt solutions (Fehllng'sche Solution) compared to reducing sugars such as Fructose, do not reduce »Preferably the saccharides are in a photograph! See negative material in a concentration of 30 to 1000 g per mole of silver is used.

lim to activate the stabilized developer mixes ,

, the most diverse known basic compounds V can be used The alkaline compounds' (

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can be incorporated into the photographic material itself or applied from a solution.

Suitable alkaline compounds are inorganic compounds such as sodium metaborate and sodium hydroxide or sodium carbonate, and organic bases such as guanidine. The developer mixes are sensitive to light Incorporating material, it is advantageous to have a relatively low pH, preferably around 9 to 11, maintain. Sodium metaborate has proven to be particularly advantageous as an alkaline compound. The alkaline compounds can be in the most varied Concentrations are applied. A particularly suitable concentration range is 0.4 to 5 g per m 2 of support surface.

In a particularly advantageous manner, the oxidation inhibitors can be used in the context of chemical transfer processes use. With this method, ζ. B. an exposed photographic material consisting of a support and a silver halide layer applied thereon, which per mole of silver a) 12.5 to 250 g of a 3-pyrazolidone development compound, b) 7.5 to 150 g of one of ascorbic acid, a derivative thereof or a mixture of at least

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50 wt .- # ascorbic acid and a polyhydroxybenzene Auxiliary developer compound and c) 125 to 2500 g of one from an alkali metal or ammonium salt of a hydroxylated, polybasic, organic acid consisting of contains hibitors, in the presence of water and an alkaline A compound with a receiving sheet containing a silver halide solvent and a silver halide precipitant brought in contact. The photographic material preferably additionally contains a saccharide. In an advantageous manner is the alkaline compound in the photographic material, which is prior to being brought into contact with the Receiving sheet is moistened with water.

The receiving sheet used in such a chemical transfer process may optionally contain a neutralizing agent. Such neutralizing agents are; * Compounds that neutralize the acidity of the paper used as a carrier in the receiving sheet and thereby enable the production of better chemical transfer images. Compounds such as sodium fluoride, sodium oxalate, sodium metaborate and the tetrasodium salt of ethylenediaminetetraacetic acid and mixtures thereof are preferably used as neutralizing agents. The neutralizing agent may be present in any possible concentration in the receiving sheet I

with which the desired neutralization can be achieved / leaves. ^

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With the known chemical transfer processes, the Undeveloped silver halide used in the non-image areas of the negative to make a positive by the undeveloped silver halide is dissolved and precipitated on a silver layer which is in early contact with the original silver halide emulsion layer. Such methods are for example in the USA patents 2,352,014, 2,543,181 and 3,020,155.

Either physical development nuclei or former precipitants can be used as silver precipitants on the receiving sheets be incorporated. Examples of this are a) heavy metals, especially in colloidal form, and the salts of these metals, b) Salts, the anions of which are a less soluble silver salt form than it is the silver halide to be treated photographic emulsion, or c) non-diffusing polymeric substances with functional groups which are associated with the Silver ions interact and make them insoluble can do.

Suitable silver precipitants are e.g. B. sulfides, selenides, polysulfides, Polyselenides, thiourea and its derivatives, mercaptans, tin (II) halides, silver, gold, platinum, palladium and mercury, colloidal sulfur, aminoguanidine

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sulfate, aminoguanidine carbonate, arsenic (JII) oxide ,. Sodium stannite, substituted hydrazines and xanthates. Heavy metal sulfides, such as lead, silver, zinc, Nickel, antimony, cadmium and bismuth sulfides. Especially good are suitable die.Sulfide of lead and zinc, alone or in a mixture with one another, or complex salts of these metals with Thioacetamide, dithiooxamide or dithiobiuret. For use suitable silver precipitants are used in the receiving sheets, for example in U.S. Patents 2,352,014, 2 J40 and 3,020,155.

The concentration of the silver precipitant in the receiving sheet must be so high that a positive and complete removal of the unexposed silver halide ^ from the photosensitive Material is guaranteed. By suitable choice of the silver precipitating agent and its concentration, the sensitometric properties of the image obtained steer. A suitable concentration for the silver precipitation

mg?

medium is 0.0lf to 0.1 g per square meter of support surface.

The usual known silver halide solvents can be used in the reception sheet, such as alkali metal thiosulfates, e.g. B. Sodium thiosulphate and potassium thiosulphate, Alkalithiocjranatej Alkali selenocyanates, thioglycerin, aminoethane

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thiols and p, p * -dithiosuberic acid be present. The Silberhalogenidlöaungsmittel can be used in various concentrations with which the desired results can _t achieve. A particularly suitable concentration is 0.5 to 3.0 g per m ^{2 of support} surface.

The various, for the development of the described photographic Elements required components, such as developer verb indungen, antioxidants, alkaline The material, silver halide solvent, saccharide, and the like may be the same or different layers of a photographic Material or different materials are incorporated. You can except for the silver halide solvent accommodated directly in the silver halide emulsion layer or in a layer adjacent to the emulsion layer will. Some of the mentioned ingredients can may be incorporated into the photosensitive material, while others may be present in the receiving material. So can for example the developer compounds the photosensitive photographic material incorporated into in which case the development by contacting the Material is done with an alkaline activator solution. If all components are present in the photographic material, development occurs as soon as the light-sensitive material is brought into contact with a receiving or treatment sheet in the presence of water. Contains that Material enough moisture * so a development can even with the mere heating of the elements in contact occurrence. - - - ». 009819/097 5 bath original

That used to make the photographic materials Silver halide emulsion can contain common additives such as gelatine plasticizers, coating auxiliaries, Antifoggants such as azaindenes, such as Hardeners, such as aldehyde hardeners, e.g. B. Formaldehyde, Mucochloric Acid, Glut araldehyd * -Öls- (natrlumbisulf It), Maleic acid aldehyde, aziridines, dioxane derivatives and oxypolysaccharides, included * For sensitizing such emulsions suitable sensitizing dyes are, for example in U.S. Patents 2,526,632, and 2,503,776. Suitable spectral sensitizing dyes are e.g. B. cyanines, merocyanines, complexes ■ (3-core). Cyanines, complex (3-nucleus) merocyanines, • Styryl dyes and hemicyanines.

For the preparation of the emulsion can be used as photosensitive Salts a wide variety of silver salts, such as silver bromide, silver iodide, silver chloride and mixed Silver salts such as silver chlorobromide and silver bromoiodide can be used. Also suitable are silver halides, which display latent images mainly on the surface of silver halide crystals, or also silver halides, Many latent images inside the silver halide crystals as described in, for example, U.S. Patent 2,592,250.

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To prepare the silver halide emulsion layer, the usual suitable hydrophilic, water-permeable binders, such as g & atine, colloidal albumin, polyvinyl compounds, Cellulose derivatives' and Aerylamid ^ polymers, used will. Mixtures of such binders can also be used. The binders of the emulsion layer such photographic elements can also include "polymerized vinyl compounds." contained dispersed. Such compounds are described, for example, in U.S. Patents 3,142,568, 3,193 '386, 3,062,674 and 3,220,844. These include also the water-insoluble poly (alkyl acrylates and methacrylates), poly (acrylic acid), poly (sulfoalkyl acrylates and methacrylate) and the like.

The silver halide emulsions can be of a wide variety Carrier applied. Suitable carriers are, for example Films made of cellulose nitrate, cellulose esters, polyvinyl acetylene, polystyrene, polyethylene terephthalate) or similar resins as well as glass, paper, metal and dergi .. It can also with poly-a-olefins, in particular with Po3 ^ a-olefins from monomers with 2 or more carbon atoms (polyethylene, polypropylene, ethylene butene mixed poly- ' merisate) and the like, coated papers can be used as a carrier.

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The sensitometric properties of such photographic Emulsions or the layers produced therefrom can furthermore be improved by giving them the most varied of hydrophilic colloids, such as, for example, that in carboxymethyl protein described in U.S. Patent 3,011,890 or that in Canadian Patent 635,206 incorporated polysaccharides described.

The emulsions can also increase the sensitivity Compounds such as quaternary ammonium compounds, polyethylene glycols or thioethers contain. In In many cases, particularly advantageous results can be achieved if you reduce the sensitivity Adding compounds to the photographic developer solutions, instead of incorporating them into photographic emulsions. Possibly the sensitivity-increasing compounds can be added to developer solutions and photographic emulsions to be incorporated »

The photographic ones prepared in the manner described Materials can be used on a wide variety of photogaphl * see areas used · you can for example, if you wish, in the X-ray photography or in areas where there is no visual sensibility Items required are used. You read

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however, they can also be used as orthochromatic, panchromatic or IR-sensitive materials. The sensitizers can be added before or after the addition of any sensitizing dyes.

The silver halide emulsions used in the preparation of the photographic elements described can be made from any of sensitization processes known to emulsionists, for example by digesting with natural acti \ a? Gelatine or various sulfur, selenium, tellurium and / or gold compounds are sensitized. The described Finally, emulsions can also contain noble metal salts of group VIII of the periodic table with an atomic weight be sensitized by greater than 100.

The following examples are intended to illustrate the invention in more detail. .

Example 1,

Developer solutions of the following composition were prepared:

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Development solution A (reference solution)

Sodium metaborate χ 4HpO 25 g

Sucrose 25 g

Ascorbic acid 4g

l-phenyl-3-pyrazolidone Ig made up to 1 liter with water,

Developer solution B

Sodium metaborate χ 4HgO 25 g

Sucrose 25 g

Ascorbic acid 4g

l-phenyl-3-py ^ azolidone Ig

Sodium tartrate 50 g

made up to 1 liter with water,

Several sensitometric strips, one with a silver chlorobromide emulsion coated photographic paper were exposed and either in developing solution A or developing solution B. The development was carried out

1. immediately after the preparation of the individual developer solutions,

2. after 24 hours and
3 «after 48 hours.

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The D values of the developed strips are as follows Table specified:

Developer solution A (reference solution)

Developer solution B

D in development

in the freshly prepared developer solution -

1.30
1.30

λ. _ With development ^max lung

after
2k hours

after 48 hours,

0.90
1.30

0.30 1.10

The results given in the table clearly show that by adding sodium tartrate as an oxidation inhibitor the loss of activity of the developer solution that occurs over time is considerably reduced.

Example 2 .

A developer solution of the following composition was prepared: -

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Bone gelatine 100 g "

Sodium retaborate χ 4H ₂ O 100 g

Sucrose 100 g

Sodium tartrate ■ - 200 g

Ascorbic acid 9 U

1-phenyl-3-pyrazolidone 10 g

Methanol 200 g

10% formaldehyde solution 4 ml

15% saponin solution 30 ml

made up to 2.5 liters with water.

The obtained solution was put on a paper support in this manner

2 applied that on a support area of 1 m 100 ml of solution accounted for.

A customary additive was applied to this developer layer, such as antifoggants, coating auxiliaries, hardeners and the like, containing silver chloride gelatin emulsion layer applied. The one used to make this layer The emulsion was applied to the developer layer in such a way that that 0.6 g of silver were accounted for per m of support surface.

A corresponding photographic paper was also used manufactured in which the sodium tartrate in the developer layer was replaced by sodium citrate.

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The photographic papers produced in the manner described and containing either sodium citrate or sodium tartrate in the developer layer showed no signs of destruction after 6 months of storage at a relative humidity of 35% or after 7 days of drying at 50.degree.

Photographic papers prepared for comparison purposes, which still contained sodium tartrate in the developer layer either sodium citrate, could not be developed after 1-month storage and after 7 days at 50 ⁰ C TroÜcknung.

Example 5

By mixing the following solutions together, a Mixture containing germs produced.

Solution A:

Bone gelatin 113 g

Water 3500 ml

Solution B:

n-NagS solution _; 7.5 ml

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Solution C;

..n-NiCl-g-solution 7.8 ml

Water 600 ml

Solution B was poured into solution A at 40 ° C. On that Solution C became the obtained mixture in 4 minutes admitted. The weight of the mixture was found to be 4860 g brought.

By applying a solution of the following composition A receiver sheet containing conventional nickel sulfide nuclei was produced on a carrier,

Bone gelatin 20 g

the one prepared in the manner described and containing nickel sulfide nuclei Mixture x 100 g

Sodium thlosulfate 10 g

Sodium metaborate χ 4Ii ₂ O 60 g

Sodium sulfite 15 g

1% ± ge mercaptooxazoline solution 15 ml

Daily saponin solution 10 ml

10% formaldehyde solution 10 ml

made up to 1250 ml with water.

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The obtained solution was thus applied to a carrier

Serving document paper applied that per m of support surface 60 ml of solution; met.

A negative paper produced as described in Example 2 was reflex-exposed, immersed in water for a few minutes and brought into contact with the receiving bit. Excellent quality positive copies were obtained. Development can be carried out in a conventional reversal transfer device containing only water as an activator; will. The water temperature may be between about 5 and about 50 ⁰ C.

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Claims (16)

15 97b 41 PATENT CLAIMS 1. Use of alkali salts polybasic, at least one • Organic acids having hydroxyl groups together with a) a 3-pyra2olidone developer compound and b) an auxiliary developer compound consisting of ascorbic acid, an ascorbic acid derivative or a mixture of at least 50% by weight ascorbic acid or an ascorbic acid derivative and a polyhydroxy ^ benzene, as an oxidation inhibitor in the Development of photographic materials. 2. Use of alkali salts according to claim 1, characterized in that they are in the form of a developer ^{mixture consisting of a) v of} a 3-pyrazolidone developer compound, b) 0.03 to 13 g of auxiliary developer compound per millimole of 3-pyrazolidone developer compound and c) 0 , 03 to 60 ".g of at least one alkali salt of a polybasic organic acid containing at least one hydroxyl group is used per millimole of 3-pyrazolidone developer compound. . 3. Use of AJkali salts according to Claims 1 and 2, thereby characterized in that it consists of the alkali metal. and / -or ammonium salts of citric acid and / or tartaric acid exist. BATH ORIGINAL 009819/0976 " ^? 8V 1597S41 4. Use of alkali salts according to Claims 1 to 3, characterized in that they are made from sodium citrate and / or Sodium tartrate consist. 5. Use of alkali salts according to Claims 1 to 4, characterized in that they are in the form of a developer ' mixture used, which also contains a saccharide, 6. Use of polybasic alkali salts, at least one Organic acids containing hydroxyl groups according to claim 1, characterized in that they are used in amounts of 125 to 2500 g per mole of silver together with a) 12.5 to and 25Og of a 3-Pyrazolidonentwieklerverbindung / \ b) from 7.5 to 150 g of ascorbic acid, an ascorbic acid derivative or a mixture of at least 50 wt -.% of ascorbic acid or an ascorbic acid derivative and a polyhydroxybenzene existing auxiliary developing agent, each per mole of silver, is used 7. Use of alkali salts according to claim 6, characterized in that that they are used in a photographic element whose silver halide layer is comprised of a silver halide emulsion layer consists. BATHROOM OHIGINAL 0 09819/0975 ■ - 29 - 8. Use of alkali salts according to claims 6 and | ?, thereby characterized by being in a photographic format . material used, which also contains an alkaline compound contains. 9. Use of alkali salts according to claims 6 to 8, characterized characterized by having them in a photographic element used, which additionally contains a saccharide. 10. Use of alkali salts according to claim 9 $, characterized in that they are used in a photographic material which contains sucrose or raffinose. 11. Use of alkali salts of polybasic organic acids having at least one hydroxyl group according to claims 1 to 4, characterized in that they are used in the context of a chemical image transfer process in which an exposed photographic material consisting of a support with a silver halide layer applied thereon, which in each case per mol of silver from 12.5 to 250 g of a 3-Pyrazolidonentwicklerverbindung, 7.5 to 150 g of ascorbic acid, an ascorbic acid derivative or a mixture of at least 50 wt -.% ascorbic acid or a Ascorbinsäurederlvat and a poly- BATH ORIGINAL 009819 / 097S ■ - 30 -. . 1597B41 hydroxybenzene existing auxiliary developer compound and 125 to 25OO g of at least one alkali metal and / or Ammonium salt contains the acids mentioned, in the presence of water and an alkaline compound with a Silver halide solvent and a silver halide precipitant containing receiving sheet is brought into contact, 12, use of alkali salts according to claim 11, characterized in that that they are used in a chemical image transfer process in which a receiving sheet is used which contains a neutralizing agent. 13 »Use of alkali salts according to claim 12, characterized in that that they are used in a chemical image transfer process in which a receiving sheet is used, the neutralizing agent sodium fluoride, Sodium oxalate, sodium metaborate, the tetrasodium salt of Contains ethylenediamine tetraacetic acid or mixtures thereof. . l4, use of alkali salts according to claims 11 to 13, thereby characterized by being used in a photographic material for the image transfer process which contains an alkaline compound. BATH ORIGINAL 009819/0975 ". 159754 V 15. Use of alkali salts according to claims 11 / and l4, da- • characterized by having them in a photographic Material used for the image transfer process, which additionally contains a saccharide. 16. Use of alkali salts according to claims 11 to 15,
characterized in that it is used in a photographic material for the image transfer process which is carried out prior to contacting the receiving sheet moistened with water. ■ BATHROOM. ORIGINAL 00981970975