DE1797198A1 - Image receiving material for the dye diffusion transfer process - Google Patents

Description

EASTMAN KODAK COMPANY, 343 State Street, Rochester, New York State, United States of America

Image receiving material for dye diffusion transfer process

The invention relates to an image receiving material for dye diffusion transfer processes, consisting of a substrate and a dye stain layer applied to it and at least one layer arranged between the substrate and the pickling layer.

It is known, for example, from U.S. Patents 2,983,606, 3,146,102 and 3,161,506, British Patent Specification 804 971 and French Patent 1,313,767, for the production of color images after diffusion transfer process the photographic recording materials Ver to incorporate compounds that are in the same molecule both chromophoric system of a dye as well as a photogi-yhi »chen Contains silver halide developer residue. Such

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Compounds are under the designation "dye developer" known. The known recording materials with dye developers usually have several light-sensitive Silver halide emulsion layers, each of which is selective to a different region of the spectrum is sensitized. Adjacent to the silver halide of each silver halide emulsion layer is one Dye developer arranged, the color of which is practically the complementary color to the color of the adjacent silver halide emulsion layer recorded light. The recording materials become more alkaline with the help of Treatment solutions developed.

When the diffusion transfer process is carried out, latent images are developed in the negative image areas with the help of the dye developer, which is immobilized in the negative image areas at the same time, i.e. made immobile. The dye developers of unexposed areas diffuse imagewise to the surface of the recording material and are from there on an image-receiving sheet on which they provide a positive, multicolored copy.

Those in the context of photographic diffusion transfer processes Image capture sheets used usually consist of a support, for example made of paper or coated paper, on which in the following order

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a) an acid layer to neutralize excess alkali,

b) an intermediate layer and c) a dye stain layer are applied. Image receiving sheets for the diffusion transfer process are described, for example, in U.S. Patent 3,146,102.

Disadvantageous in the use of the previously known image receiving sheets is that the colors of the color copies obtained do not always have the desired clarity and lightness and that the edges of the color copies obtained do not have the desired degree of whiteness exhibit.

The object of the invention is therefore to provide an image receiving material for the color diffusion transfer process to be specified at using it to obtain color copies with better clarity, lightness and purer hues and whiter edges will.

The invention was based on the knowledge that the The object can be achieved by the fact that the layer is arranged between the substrate and the pickling layer of the image receiving material Layer incorporated an optical brightener.

The invention accordingly provides an image receiving material for the dye diffusion transfer process, consisting from a layer support and one applied to it

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Dye stain layer and at least one between the support and a pickling layer, which is characterized in that at least one of the layers between the substrate and layers located on the pickling layer contains an optical brightener.

In a particularly advantageous manner, the image receiving material according to the invention consists of a layer support and in the The following sequence is applied to this with an acid layer, an intermediate layer and a dye stain layer, whereby at least either the acid layer or the intermediate layer contains an optical brightener.

When such image receiving materials are used in conventional dye diffusion transfer processes, color copies become obtained whose color clarity and brightening are considerably better than those obtained with known image receiving materials are to be achieved. The edges of the color copies which can be produced with image receiving materials according to the invention are also not more, as before, gray-white to yellow-spotted, but considerably whiter than the edges of those with known diffusion transmission systems manufacturable color copies.

The success which can be obtained using an image receiving material according to the invention depends on the arrangement of the optical brightener in the image receiving material, i.

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the optical brightener can be accommodated in the intermediate layer and / or the acid layer. Preferably the optical brighteners housed in the intermediate layer. The optical brightener should not be in or over the dye stain layer otherwise the color saturation of the dyes due to its ability to fluoresce degraded and black and neutral colors are recorded.

Under "optical brighteners" are the well-known colorless or to understand practically colorless organic compounds, the the UV light originating from sunlight or fluorescent light then absorb the absorbed energy in the form of emit visible blue or blue-green light * The compounds thus contain, in contrast to dyes, the colored Contain chromophoric groups, fluorescent chromophoric groups.

Optical brighteners suitable for producing the image receiving material according to the invention are, for example, those used as brighteners known triazine stilbenes, coumarins, anthracenes, terphenyls, Tetraphenylbutadienes and quinoxalines. These connections are called fluorescent compounds and optical Bleach used.

Triazine stilbenes suitable as optical brighteners are known from US ^{Pat. No. 2,933,390 in SpIe 1 SWeISe.} These loads correspond to the following general formula:

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CH = CH

Herein mean:

R ₂ , R 1, Rg and R- each represent a hydrogen atom or a

Substituents, for example a hydroxyl radical; an aryloxyl radical, for example a phenoxyl, o-toloxyl or p-sulfophenoxyl radical; an alkoxyl radical, for example a methoxyl or ethoxyl radical; a halogen atom, for example a chlorine or bromine atom; a heterocyclic radical, for example a morpholinyl or piperidyl radical; an alkylthio radical, for example a methylthio or ethylthio radical; an arylthio radical, such as, for example, a phenylthio or tolylthio radical; a heterocyclic thio radical, for example a benzothiazolylthio radical; an optionally substituted araino radical, e.g. a methylamino, ethylamino, propylaaino-, dimethylamine-, diethy1amino-, dodecylamino- _f cyclohexylamino, ß-hydroxyethylamino, di-a-hydroxyäthylamino- or ß-Su 1 thy foil I-

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aminorest; an arylamino group, e.g.

Aniline-, ο-, m- and p-sulfoanilino-, o-,

m- or p-chloroanilino-, o-, m- or p-

Anisylamino-, o-, m- or p-toludino-, o-,

m- or p-carboxyanilino, hydroxyanilino,

Sulfonaphthylamino-, ο-, η or p- Aminοanilino or p-acetanidoanilino radical;

and M

R ₄ and Rr each represent a hydrogen atom or a die

respective compound water-solubilizing radical, such as a sulfo or carboxyl radical, or their alkali metal or amine salts.

Examples for this are:

4,4'-Bis ^ 4- (3 * -sulfoanilino) -o-amino-s-triazine-z-ylamino_7-stilbene-2,2'-disulfonic acid and

4,4 · -Bis / 4,6-di (β-hydroxyethylamino) -s-triazin-2-ylamino- J- stilbene-2,2 * -disulfonic acid.

Brighteners of the formula given are also from the USA patents 2,171,427, 2,473,475, 2,595,030 and 660,578 and British patents 595,065, 849, 624 051, 624 052, 678 291, 681 642 and 705 406 are known.

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(Further optical brighteners which can be used in image recording materials according to the invention are sold under the trade names Tinopal-SP, -WR, -SFG, -BV 277, -2B, -GS and -NG ₁ Leucophor B, Calcofluor White MR, Blancofor SC, Hitamine BSP, -N, -Sol. And -6T6).

Coumarin compounds are suitable as optical brighteners for example the 3-phenyl-7-ureidocoumarins of the general formula known from British patent 786:

R ₁ -CO-NH

where mean:

an ammonium or a primary or secondary amine radical and

an optionally alkyl-substituted phenyl radical or a halogen atom.

Examples for this are: N ¹ - / 3- (p-methylphenyl) -coumarinyl- (7) J "

N-propyl-N ¹ - ^ 3-phenyl-cu »arinyl- (7) .7-urea; NS-sulfoethyl-N ^ S-phenylcoumarinyl- (7) -urea.

(Such compounds are also available under the trade name Tiropal SFG). "09849/0802

The anthracenes, terphenyls and tetraphenylbutadienes known as optical brighteners can also be used in a corresponding manner and quinoxalines can be used.

The concentration of optical brightener in an image receiving material according to the invention can be very different. Suitably contains an image receiving material according to the invention in at least one of the specified layers from about 0.027 to about 1.076 (0.25-10 mg / sq. foot), preferably from about 0.108 to

2 about 0.538 mg of optical brightener per dm of support surface. Higher Concentrations of optical brightener usually do not bring any advantages.

The image receiving material according to the invention can comprise any of the conventionally known photographic supports. Suitable substrates consist, for example, of paper, paper coated with polyethylene, transparent foils, white-pigmented cellulose ester layer supports, such as cellulose acetate films and the like, where appropriate the support may also contain an optical brightener.

The acid-base layer comprises non-diffusible in the usual manner or immobilized, sour substituted barren acid BaIlastgruppen having monomeric or polymeric acids which may 9REN with alkaline compounds or polymeric bases T9 "*.

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The acid underlayer can also contain compounds that Have substituents capable of capturing basic reactants *

Suitable monomeric acids are carboxylic acids with at least 16 carbon atoms, such as stearic acid and palmitic acid * The acid layer preferably contains acidic compounds consisting of polymers, e.g. water-soluble polymers containing carboxyl groups, the sodium and / or potassium salts of which are water-soluble. However, the acid layer can also contain polymers which initially contain acid anhydride residues which convert into free carboxyl residues during the treatment. The layer can contain, for example, cellulose or polyvinyl derivatives or acids of other polymeric compounds as acidic polymers. Examples include: dibasic Halbester of cellulose derivatives having free carboxyl groups, such as cellulose acetate hydrogen phthalate, Celluloseacetathydrogenglutarat, Celluloseacetathydrogensuccinat, Athylcellulosehydrogensuccinat, Äthylcelluloseacetathydrogensuccinat, Athylcelluloseacetathydrogen · phthalate; ether and Esterderivate the cellulose, which are modified with Sulfoanhydriden such as o-sulfobenzoic or Polystyrolsulf ons äure, carboxymethyl cellulose , Polyvinyl hydrogen phthalate, polyvinyl acetate hydrogen phthalate, polyacrylic acid, acetals of polyvinyl alcohol or carboxy- or sulfo-substituted aldehydes, for example o- _t m- or p-benzaldehyde sulfonic acid or carboxylic acid · »Partial of

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Ethylene maleic anhydride copolymers or partial esters of methyl vinyl ether maleic anhydride copolymers.

The function of the acid layer is to develop finish and stabilize the finished copy by using the alkaline developer solution that is used to treat the photographic light-sensitive material from which the dyes as a function of exposure and development diffuse, was used, reacts and its pH value is lowered

An intermediate layer, which controls the diffusion rate of the individual constituents of the alkaline developer solution into the acid layer, is advantageously arranged between the acid layer and the dye stain layer. The intermediate layer ensures that both the time required for the complete development of the exposed photographic recording material and the time required for the transfer of the dyes from the photosensitive recording material to the image receiving material is observed. The intermediate layer expediently has a thickness of 3 to 25, preferably 8 to 15 microns * The intermediate layer can for example consist of polyvinyl acetate, polyvinyl alcohol and gelatin. It can also contain a white pigment, as is known, for example, from Belgian patent specification 699 7S7. If necessary, the intermediate layer can also contain customary additives, such as, for example, coating aids, hardeners and the like.
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The layers containing a mordant and used to receive the dye image are normally alkali-permeable. They can contain the customary known mordants for dyes, for example polymeric vinyl methyl ketone aminoguanidine derivatives of the type described in US Pat. No. 2,882,16, Poly (2-vinylpyridinetho-ptoltlolsulfonate) and corresponding compounds of the type known from US Pat. No. 2,484,430 and cetyltriraethylammonium bromide Particularly advantageous pickling agents are described in the Belgian patent specification 634 SI5

The pickling agents known from Belgian patent specification 634 S15 consist of at least one hydrophilic organic colloid with droplets or uniformly dispersed therein Ball of a high boiling point, immiscible with water organic solvent in which a cationic, non-polymeric, organic, dye-marinating compound for acidic dyes is dissolved. or at least from a hydrophilic organic colloid with uniformly dispersed therein Particles of a salt of an organic acidic compound with free acid residues and a cationic, non-polymeric, organic, dye-acidifying compound for acidic dyes.

Suitable cationic or basic, organic, dyestuff compounds are, for example, quatetmire ammonium

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and phosphonium and te mare sulfonium compounds in which with the nitrogen, phosphorus or sulfuronium atom at least one hydrophobic ballast group such as a long-chain alkyl group or a substituted alkyl group.

The optical brightener can be the one or more between the support and layers lying on top of the mordant layer, i.e. the acid layer and / or the intermediate layer, of an image receiving material be incorporated according to the invention by conventional methods. If the brightener is water-soluble, it can be the layers located between the substrate and the pickling layer are incorporated in the form of an aqueous solution. However, the image receiving materials according to the invention preferably contain water-insoluble optical brighteners. A Brighteners which are insoluble in water or at most slightly soluble can be added to the layers in font of a solution in one organic solvents such as methanol, ethanol, pyridine and the like. Be incorporated. Preferably if the optical brightener is used in the form of a latex dispersion, i.e. a mixture of the brightener with latex particles, to.

An advantageous process for the production of a latex dispersion a water-insoluble optical brightener is disclosed in U.S. Patent Application Serial No. 476 675.

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After this process, the water-insoluble brightener is preferred together with a vinyl resin, e.g. a poly (alkyl acrylate), poly (alkyl methacrylate), poly (vinyl acetal) or an alkyl acrylate / alkyl methacrylate copolymer in one reading material not miscible with water »such as Ethyl acetate or chloroform, dissolved, whereupon the obtained Solution in an aqueous solution of a hydrophilic, film-forming

| j the binder, such as gelatin, or one Ethylacrylate / acrylic acid copolymer is emulsified « The emulsion obtained is then allowed to settle and dried by evaporating off the solvent and the water. That The dried material is then soaked in water processed into a coating compound with mechanical stirring * The coating compound obtained can finally one for one, depending on the desire for the addition of the polymeric acid (in the event that an acid layer is to be prepared) Interlayer of suitable material, such as

P polyvinyl alcohol (if an intermediate layer is made should be), or applied as such.

The location of the dye image forming units of the dye diffusion transfer process The photographic recording material used may be various in a conventional manner. With three-color systems the unit forming the cyan dye image is preferably arranged immediately adjacent to the support.

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The unit forming the yellow dye image is furthest away from the support, while the unit forming the magenta dye image is arranged between the units forming the cyan and yellow dye image lying and adjacent to this layer each μ a dye image-forming unit is assigned a dye developer, the color of which is preferably practically complementary to the color of the light recorded by the silver halide layer in question *

Preferably the image receiving material forms according to the invention with a "light-sensitive recording material one unit" This becomes a photographic recording material for the color diffusion transfer method created, which consists of a) a light-sensitive unit f with several, compared to different ranges of the spectrum sensitized, light-sensitive emulsion layers and (each) one of the silver halide of the (individual) silver halide emulsion layer (s) Adjacent dye developer that has both the properties of a silver halide developing agent as well as a dye, b) a frangible, an aqueous alkaline treatment solution Containing container and c) one of the light-sensitive

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the dye developer receiving material facing the unit, which consists of a substrate, an acid layer applied to it, an intermediate layer located on this and a dye mordant layer disposed on the intermediate layer There is at least one of the elements located between the support and the layer of the dye developer receiving material Layers contains an optical brightener.

The dye developers contained in the photographic recording materials are known conventional dye developers, which have the properties of both silver halide developing agents and dyes. they are at neutral pH values in colloid layers, for example in the hydrophilic ones used in photographic construction emulsions, organic colloids practically not diffusible. The dye developers are in the presence of alkaline treatment solutions on the other hand, diffusible in emulsion layers produced from such emulsions

The dye developers have both a chromophore Residue or dye residue and at least one residue with a silver halide developing agent. Typical suitable dye developers are those in which the chromopnore remainder of one Azo or anthraquinone dye residue and the silver halide developer residue from a «benzoid radical, such as a hydroquinolyl radical, consist ·

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Typical suitable dye developers correspond, for example, to the following general formula:

M-N-N-D, where mean:

M is an optionally substituted, aromatic or

heterocyclic ring or an optionally substituted, aromatic or heterocyclic ring system and

D an optionally substituted silver halide developer serving rest.

The radical M can, for example, be a benzene, naphthalene, tetralin, anthracene, anthraquinone, pyrazole or quinoline radical be, optionally by one or more hydroxyl, amino, keto, nitro, alkoxy, aryloxy, acyl, alkylamido, Arylamido, alkyl, aryl, carboxamide, sulfonamide, carboxyl or SuIforeste can be substituted *

The radical D can, for example, have one or more amino, alkylamino, alkyl, hydroxyl or alkoxyl radicals or one or more halogen atoms substituted hydroquinolyl radical

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Further suitable · Color developers are in the local Patent specification 220 279 as well as in the same patent specification 1 036 640 described «Here a.B.i.

4 - / "p- (2 ' $ 5 · -dihydroxyphenyl) -phenylazo_7-5-acetamido-1-naphthol,

naphthol,

* 1-phenyl-3- »ethyl-4 - ^" p "(2 ^t , 5'-dihydroxyphenithyl) -phenylazo_7-5-pyrazolone,

2 - / * "p- (2 ·, 5 · -dihydroxyphenethyl) -phenylazo _- 7-4-acet amido-1 naphthol,

2 ~ l ~ V ^m (2 *>5'-dihydroxyphenethyl) -phenylazO _- 7-4-amino-1-naphthol,

QH

OH

2 ^m l "v ^m (2 ·« 5 ' -dihydroxyphenethyl) -phenylazo ^ 7-4- "ethoxy-inaphthol, ·

2 - / "p- (2 ^f , 5 · -DihydroxyphenEthyl) -phenylaio ^ - ^ - Ithexy-1-naphthol,

% ^m Cv ^m (2 ^ S ¹ -dihydroxyphenethyl) -pheny la »ö _e 7-4-n-propoxy-1 naphthol,

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CH ₂ -CH ₂

O C-NH-CH

4 "9

(Yellow dye developer)

1-Phenyl-3-N-n-butyl-carboxa «ido-4 - /" p- (2 ·, 5'-dihydroxyphenethyl) -phenylaso_7-5-pyrazolon,

1-phenyl-3-Nn-hf xylcarboxamido-4- ^ ρ- (2 · , 5 · dihydroxyphenyl) -phenylixo _- 7-5-pyratolone.

Other suitable dye developers are described in British patents 804 971 and 804 973. These include:

1,4-bis- (2 *, 5-dihydroxyanilino) -anthraquinone,

1 1 S-bis (2 ', 5'-dihydroxyanilino) -4 _$ 8-dihydroxyanthraquinone,

1,4-bis (1 "a-3 ', 4" -dihydroxyphenyl) -IthylaJiino_7- «nthrechinon _#

NHCH-CH.

NHCH-CH.

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(Cyan dye developer)

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ß- ( ^{2.5 l} -dihydroxyphenyl) -isopropylamino _gii 7-anthraquinone,

1,4-bis ^ "ß- (2 \ 5'-dihydroxyphenyl) -äthylaaino_7-anthraquinone,

1-chloro-4 - / "ß- (2 ·, 5 * -dihydroxyphenyl) räthylamino_7-anthraquinone.

Further dye developers can be found in US Patents 3,146,102 and 3,161,506, Belgian Patent 554,935, British patents 804 971, 804 973, 804 974 and 804 975 and from the French patent 1 168 292 known.

In photographic recording materials of the type described, the dye developers are preferably incorporated into the hydrophilic, organic, colloidal binders or carriers of the individual layers of the photographic material in the form of a solution in high-boiling or crystalloidal solvents and dispersed in finely divided droplet form. In the preparation of such dye developer dispersions, high-boiling or practically water-immiscible organic liquids with boiling points above about 175 ^° C. can be used , organic solvent, des ·· »

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Boiling point is at least 25 ⁰ C below the boiling point of the higher-boiling solvent, or a water-soluble organic solvent can be used.

The high-boiling solvent and the auxiliary solvent are preferably used in a weight ratio of 1: 1 to 1:10 mixed together. Such auxiliary solvents can be passed through from the high-boiling solvent, for example Drying a settled, noodled dispersion in the air or easily removed by continuous washing with water. Various such high-boiling solvents and auxiliary solvents for incorporating dye developers are known from French patent 1,313,765. The dye developers can optionally also use such Binders are incorporated in organic solvents, which are also solvents for the respective Represent dye developers, are soluble. For incorporating the dye developer in the production of photographic Materials of the type described can also be used by other methods, such as, for example Ball mill grinding and the like., Can be used.

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Photographic recording materials of the described Type can advantageously be auxiliary developer compounds, such as colorless, practically water-insoluble Hydroquinone derivatives of the French patent 1 313 086 included. Such auxiliary developer associations can be the silver halide emulsion layers, top layers, interlayers or other layers of the Recording material incorporated.

The silver halide emulsions used to produce the recording material can be customary, developable Be negative emulsions. Silver halides customary for the production of such emulsions are, for example, silver chloride, Silver bromide, silver bromoiodide, silver chloroiodide and silver chlorine brom i odid. If appropriate, mixtures of these silver halides can also be used. When making such Silver halide emulsions can be used as binders of the most varied of hydrophilic organic colloids will. Gelatin is preferably used as the hydrophilic colloid. Other suitable colloids are, for example Polyvinyl alcohol, its water-soluble derivatives and copolymers, water-soluble copolymers, such as Polyacrylamide, imidized polyacrylamide and the like., As well as other water-soluble, film-forming substances, the can be used to produce water-permeable layers such as colloidal albumin and water-soluble cellulose derivatives. If appropriate, compatible mixtures of two or more such colloids can also be used be used. 009849/0802

"" "1797190

In recording materials of the type described, the dye developers form an integral part of the recording material and are arranged adjacent to the silver halide of the individual light-sensitive silver halide emulsion layers. This means that the dye developers can be incorporated in the light-sensitive silver halide emulsion layers directly or in layers arranged adjacent to these emulsion layers. A recording material of the type described μ contains at least one dye image-forming unit, each unit comprising a photosensitive silver halide emulsion and a silver halide emulsion layer the silver halide of the adjacently disposed dye developer is. Each dye image-forming unit is preferably spectrally sensitized to that portion of the spectrum whose color is complementary to the color of the corresponding dye developer.

The recording material exposed to initiate development Treatment solutions or activators of the type described are strongly alkaline and usually have a pH of at least about 12 and are at least 0.01 η of HydroxyHones. To the developer solutions To give such a high alkalinity are advantageously used alkali metal hydroxides, such as, for example Sodium hydroxide and sodium carbonate are used. Furthermore can

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Volatile amines, such as diethylamine, are used · Such aaine have the advantage that they can be volatilized from the copies so that they do not contain any alkaline residues Treatment solutions usually consist of aqueous liquids or solutions and when placed in breakable containers for use in a camera are, as a rule, thickeners such as hydroxy- ^ äthylcellulose or carboxymethylcellulose. The alkaline Treatment solutions can also be found in the United States patents 3,146,102 and 3,161 S06, French Patent 1,313,767 and British Patent 938,865 Contains onium compounds.

A camera suitable for exposing and developing recording materials of the type described is for example known from US Pat. No. 2,435,717. The development of the recording materials can, however, also take place outside of it the camera can be done by either the image receiving material or the negative material or both in the alkali Immersed treatment solution and then compressed so that the dye developer images onto the receiving material can diffuse

The following examples illustrate the invention in more detail.

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example 1

1) First, a photographic recording material was prepared by using on a cellulose acetate film support the following layers were applied to an adhesive layer:

A) cyan dye developer layer;

An aqueous gelatin solution with the blue-green developer 5,8-dihydroxy-1,4-bis ^ "(ß-hydroquinonyl-α-methyl) äthylamino ^? -" anthraquinone was in a mixture of N-n-butyl acetanilide, 4-methyl-cyclohexanone and a common dispersant (Alkanol B) dispersed. The resulting mixture was passed several times through a colloid mill onto the adhesive layer of the cellulose acetate film base and dried to to volatilize the 4-methylcyclohexanone.

B) Red sensitive emulsion layer: A ([

gelatin-silver bromoiodide emulsion sensitized against the red region of the spectrum was applied.

C) intermediate layer:

A gelatin intermediate layer was applied to the red-sensitive emulsion layer B) applied.

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D) Purple dye developer layer:

An aqueous gelatin solution with the purple-red dye developer 2- / ~ ρ- (2 · _> 5'-dihydroxyphenethyl) -phenylaio _{> e} 7-4-npropoxy-1-naphthol was in a mixture of cyclohexanone »Nn-butyl acetanilide and a conventional dispersant (Alkenol B) dispersed. The mixture obtained was passed through a colloid mill several times, applied to the intermediate layer fc C) and dried in order to volatilize the cyclohexanone.

E) Green-sensitive emulsion layer:

A green-sensitive silver bromoiodide emulsion was applied to the magenta dye developer layer D).

F) intermediate layer;

On the green-sensitive emulsion layer E) was a Fe gelatin interlayer applied.

G) yellow dye developer layer:

An aqueous gelatin solution with the yellow dye developer 1-phenyl-3-Nn-hexylcarboxamido-4 - / "p- (2 ', 5 * -dinydroxyphenethyl) phenylazo _M 7-5-pyrazolone was in a mixture of ditetrahydrofurfuryl adipate, ethylene glycol monobenzyl customary dispersing agent (alkanol B). The mixture obtained was several times through a colloid mill.

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leads, whereupon the dispersion obtained is cooled and xua settling was washed to remove the ethylene glycol monobenzyl ether. Finally, the dispersion was applied to the second interlayer F) applied and dried.

H) Blue-sensitive emulsion layer:

A blue-sensitive silver broajodide emulsion was applied to the yellow dye developer layer G).

1) top layer;

Finally, a gelatin layer containing ^{the colorless auxiliary dye developer 4 (} -methylphenylhydroquinone) was applied to the blue-sensitive emulsion layer H).

2) An image receiving sheet A) was produced (comparative material):

a) acid layer;

25 g of one formed from 60 l of butyl acrylate and 40 l of acrylic acid Copolymers were dissolved in SO al denatured ethanol. The resulting copolymer solution was 1 g Resorcinolbiglycidylttaer Im S al Xthanol added «whereupon the mixture with ethanol made up to a total of 100 g became. The mixture obtained was thus coated on a support made of waterproof paper.

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2
that per dm of carrier flea about 2.7 ml of sealing compound,

speaking about 269 ag of acidic resin, accounted for.

b) intermediate layer:

8 g of a 55-day polyvinyl acetate latex dispersion were added 12.5 g of a 10-strength polyvinyl alcohol solution were added. The mixture obtained was made up to a total of 25 g with water, whereupon the coating composition obtained is applied to the acid layer a) in a thickness of 0.1016 mm has been applied *

c) Dye stain layer:

12.5 g of a 10-strength polyvinyl alcohol solution, 0.5 ml of acetic acid, 0.1 ml of isooctylphenyl polyethoxyethanol and 0.05 g of 1-phenyl-5-mercaptotetrazole were added to a solution of 1.25 g of poly-4-vinylpyridine in 25 ml of distilled water * The mixture obtained was made up to a total of 50 g with distilled water and applied to the intermediate layer b) applied in a thickness, measured when wet, of 0.1524 mm *

3) It has an appropriate Eapfangsblatt B), as described under 2), prepared _for ever but contained in the acid layer / an optical brightener.

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a) acid layer;

A solution of 3 g resorcinol biglycidyl ether in 20 ml ethanol became a solution of 50 g of a copolymer formed from 60 t of butyl acrylate and 40 l of acrylic acid in 20 ml Ethanol added. The mixture obtained was made up to a total of 250 g with ethanol. The received Coating solution, in each case per 25 g of coating solution, 4.4 mg of the optical brightener N- (ß-dimethylaminoethyl) -N'- described in Example 3 of British Patent 7S6 234 ^ "3-phenyl-coumarinyl- (7) ^ urea incorporated. Finally the obtained coating material was applied to a waterproof

2 paper supports applied in such a way that per dm of support surface

about 0.22 mg of optical brightener were omitted «

b) intermediate layer;

8 g of a 55% polyvinyl acetate latex and 0.05 g of 1-phenyl-5-mercaptotetrazole were with 12.5 g of a 10-liter polyvinyl alcohol solution mixed. The mixture obtained was made up to a total of 25 g with distilled water and the The coating compound obtained was applied to the acid layer a) in a thickness, measured in the moist state, of 0.1016 mm.

c) Dye stain layer:

6.25 g of a 10-liter polyvinyl alcohol solution and 0.05 ml of isooctylphenylpolyethoxyethanol were added to a solution of 6.25 g of poly-4-vinylpyridine in acetic acid. Which he-

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Holding mixture was made with distilled * water to total 25 g topped up and the resulting Beschichtiatgsmasse on the Interlayer b) in one thickness, sat in a moist state » applied from 0.1524 mm,

4) A corresponding receipt sheet c), as under 3) described, manufactured, but with the exception »· that the for Preparation of the acid layer used coating compound P 8.8 ag of the optical brightener were incorporated so that in of the acid layer per dm of support surface a total of 0.43 mg of the brightener accounted for.

The produced recording material was divided into three parts, exposed under a step wedge through red, green and blue filters and then in contact with the individual Receiving sheets, which were described under 2), 3) and 4), with an aqueous activator of the composition:

™ highly viscous hydroxyethyl cellulose *

(Hercules type 250) 3.5 t

Sodium hydroxide 4.5 l Benzotriazole 2.0 I.

i-phenethyl-2-picolinium bremid 2.0 I.

have been moistened. In either case, transfer of the cyan, magenta, and yellow dye developer images could occur

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the undeveloped districts can be observed on the receiving sheet «In each case, a transmission time of 1 minute and an opening of 0.4304 mm, accordingly the thickness of the actuator layer.

The obtained color copies were tested for density, reflectivity and examined their relative brightness. The results obtained in the studies are as follows Table I indicated:

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009849/0802

Table I.

Copy

max fnautral scale

"rain fNeutralskalal

percentage reflection
fortune at

Relative brightness * ^ at

Image receiving material

Red green blue red green blue

405
my

410

410
mti

420
mn

430

ο ο co

O CP O

1.47 1.83 1.82 0.18 0.21 0.23 76.5 77.5 78.0 79 1.61 1.88 1.93 0.20 0.22 0.25 82.5 81 , 0 80.5 87

1.53 1.85 1.92 0.19 0.23 0.25 85.5 83.0 81.5 87

80 82.0

90 90.5

94 94.5 '

♦) The values were obtained with the only coated, i.e. containing no transferred dyes Images received

co

—Α.

co

Example 2

There was obtained an image-receiving sheet having an acid layer and a dye mordant layer corresponding to the image-receiving sheet 2 of Example 1, but with the exception that the intermediate layer b) in the manner described below an optical brightener was incorporated:

b) intermediate layer;

8 g of a 55-liter polyvinyl acetate latex and 2.25 g of a 9.2 l solids-containing poly (alkyl acrylate) latex in which 2.6% of the optical brightener is N- (β-dimethylaminoethyl) -N ^f -3-phenyl-coumarinyl - (7) urea was contained was added to 12.5 g of a 10-liter polyvinyl alcohol solution. The mixture obtained was made up to a total of 31 g with distilled water and applied to the acid layer a) in a thickness, measured in the moist state, of 0.1016 mm, with about 0.16 mg of the optical brightener being used per dm of support surface *

The receiver sheet prepared in the manner described was used as described in Example 1 to transfer a dye image of the recording material described in Example 1 was used. For comparison purposes, the relative The brightness of the receiving sheet compared with the brightness of the receiving sheet A of Example 1. The results are compiled in the following table:

009849/0802

Table II ' Example relative brightness at

410 mu 420 ημ 430 mn

1 79 80.0 82.0

2,86 89.5 89.5

Example 3

A) The recording material and the image-receiving sheet of Example 1 were treated as described in Example 1), with the exception, however, that the negative material is completely exposed before the treatment and the transfer is then carried out Determination of the influence of four treatment conditions on the receiving sheet in the absence of a color transfer image was carried out.

B) For comparison, an image-receiving sheet having an acid layer and a dye mordant layer was used as the image-receiving sheet A) of Example 1 prepared in the manner described below:

b) intermediate layer:

The intermediate layer corresponded to the intermediate layer of the receiver sheet of Example 2, with the exception that the for

0098 / ♦ 9/0802

Preparation of the coating compound used 4, 5 g of the poly (alkyl acrylate) latex dispersion, see above that about 0.34 mg of the optical brightener were used per dm of support surface «

The image-receiving sheet obtained was described in US Pat Treated and tested manner using the photographic material of Example 1, but with the exception that the photographic material was completely exposed before processing

The values of the relative lightnesses of the copies obtained with the image receiving documents are as follows Table III compiled:

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009849/0802

Table III Try Relative Brightness at

410 420 430 440 450 460 470 480 490 500 600 700

mn mn my ΐημ my mn my my πΐμ mn mn my

<ο A 52 54.0 56.0 57.5 58.5 59.0 60.5 61.5 62.0 63.0 6S, 5 80.5

ο B 55 60.0 62.0 62.5 62.5 63.0 63.5 64.0 64.5 64.5 72.5 82.0

From the values in the table it can be seen that the color copies obtained according to the invention have a better brightness and an improved density, What. in dye developer diffusion transfer systems means a significant advantage.

009849/0802

Claims (1)

Claims 1) image receiving material for dye diffusion transfer process, consisting of a layer support and a dye stain layer applied to it and at least one between the substrate and the pickling layer aageerdaetea Layer “characterized by at least one of the layers between the substrate and the pickling layer contains an optical brightener. 2) image receiving material according to claim t, characterized in that that the optical brightener in one of the support adjacent acid layer is accommodated 3) image receiving material according to claim t »characterized in that that the optical brightener lying in a bucket ZMischa layer support and pickling layer, adjacent to the pickling layer arranged intermediate layer is honored ^ Image receiving material according to claims 1 to 3 * dedarch, characterized in that it contains the optical brightener Im in a concentration of about 0.027 to about 0.7 », preferably from about 0.10» to about 0.53t mg / dm ^{2 of} carrier fly. 009849/0802 5) image receiving material according to claims 1 to 4, characterized in that that it contains a water-insoluble triazine-stilbene compound as an optical brightener. 6) image receiving material according to claims 1 to 4, characterized in that that it contains an (optionally substituted) coumarin as an optical brightener. 7) image receiving material according to claim 6, characterized marked ™ net that it contains 3-phenyl-7-ureidocoumarin as an optical brightener. 8) image receiving material according to claims 1 to 7, characterized in that that it is a light-sensitive recording material, consisting of several as opposed to different Ranges of the spectrum sensitized, photosensitive emulsion layers and (each) one of the Silver halide of the (single) silver halide emulsion layer (s) Adjacent dye developer that has both the properties of the silver halide developing agent as much of a dye, as well as a breakable one containing an aqueous, alkaline treatment solution Container forms a unit.