Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
  • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
  • G03C1/30—Hardeners
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/815—Photosensitive materials characterised by the base or auxiliary layers characterised by means for filtering or absorbing ultraviolet light, e.g. optical bleaching

Definitions

• the invention relates to a color photographic silver halide recording material, in particular one with a reflective base, which provides higher color densities.
• Color photographic materials are known from EP O 243 199 A2, in particular color negative paper, which contain in at least one light-sensitive layer a silver halide with at least 80 mol% chloride, which have a layer with a UV light-absorbing agent which is liquid at room temperature, and which are hardened with a vinyl sulfone hardener.
• This color negative paper can be used in the so-called short-term process, in which the development time is 45 seconds, to produce color image images.
• the material is characterized by reduced pressure desensitization, but still does not provide really satisfactory maximum densities.
• the invention thus relates to a color photographic silver halide recording material which, on a support, preferably a reflective support, contains at least one silver halide emulsion layer whose silver halide grains contain at least 80 mol% of silver chloride and at least one layer, preferably a non-light-sensitive layer, which contains an ultraviolet light absorbent, which is liquid at 15 ° C, contains and is hardened with an instant hardener.
• Immediate hardeners are understood to mean compounds which crosslink suitable binders in such a way that the hardening is completed to such an extent immediately after casting, at the latest after 24 hours, preferably at the latest after 8 hours, that no further change in the sensitometry caused by the crosslinking reaction and the swelling of the layer structure occurs .
• Swelling is understood to mean the difference between the wet film thickness and the dry film thickness during the aqueous processing of the film (Photogr. Sci. Eng. 8 (1964); 275; Photogr. Sci. Eng. (1972), 449).
• the instant hardener is used in particular in an amount of 0.1 to 5 mmol / m2, preferably 0.5 to 1.7 mmol / m2.
• Suitable examples of instant hardeners are compounds of the following general formulas: wherein R1 denotes alkyl, aryl or aralkyl, R2 has the same meaning as R1 or means alkylene, arylene, aralkylene or alkaralkylene, the second bond having a group of the formula is linked, or R1 and R2 together to complete an optionally substituted heterocyclic Ring, for example a piperidine, piperazine or morpholine ring mean necessary atoms, which ring can be substituted, for example by C1-C3-alkyl or halogen, R3 for hydrogen, alkyl, aryl, alkoxy, -NR4-COR5, - (CH2) m -NR8R9, - (CH2) n -CONR13R14 or or a bridge link or a direct bond to a polymer chain, wherein R4, R6, R7, R9, R14, R15, R17, R18, and R19 are hydrogen or C1-
• the heteroaromatic ring represented by R51 is, for example, a triazole, thiadiazole, oxadiazole, pyridine, pyrrole, quinoxaline, thiophene, furan, pyrimidine or triazine ring. In addition to the at least two vinylsulfonyl groups, it may optionally contain further substituents and optionally fused-on benzene rings, which in turn may also be substituted. Examples of heteroaromatic rings (R51) are listed below. wherein r is a number from 0 to 3 and R52 is C1-C4-alkyl, C1-C4-alkoxy or phenyl.
• alkyl is in particular C1-C2 Hydrox-alkyl optionally substituted by halogen, hydroxy, sulfo, C1-C20-alkoxy.
• Aryl unless otherwise defined, is in particular optionally substituted by halogen, sulfo, C1-C20-alkoxy or C1-C20-alkyl C6-C14-aryl.
• Aralkyl unless otherwise defined, is in particular substituted by halogen, C1-C20-alkoxy, sulfo or C1-C20-alkyl C7-C20-aralkyl, alkoxy, unless otherwise defined, in particular is C1-C20-alkoxy.
• X ⁇ is preferably a halide ion such as Cl ⁇ , Br ⁇ or BF4 ⁇ , NO3 ⁇ , (SO4 2 ⁇ ) 1/2 , ClO4 ⁇ , CH3OSO3 ⁇ , PF6 ⁇ , CF3SO3 ⁇ and in particular a -SO3 ⁇ covalently linked to the hardener molecule Group, where the -SO3 ⁇ group can be directly connected to the heterocycle via a substituent (see definitions alkyl, aryl, aralkyl) or in the formulas (a), (b), (c).
• a substituent see definitions alkyl, aryl, aralkyl
• Alkenyl is especially C2-C20-alkenyl
• alkylene is especially C2-C20-alkylene
• Arylene especially phenylene, aralkylene especially benzylene and alkaralkylene especially xylylene.
• Suitable N-containing ring systems that can represent Z are shown on the previous page.
• the pyridine ring is preferred.
• R36 and R37 together with the nitrogen atom to which they are attached, in particular form a pyrrolidine or piperidine ring bonded by 2 oxo groups in the o- and o'-position, which may be benzo, cyclohexeno- or [2.2.1] -bicyclohexenocondensed .
• Acyl is especially C1-C10 alkylcarbonyl or benzoyl; Carbalkoxy is especially C1-C10 alkoxycarbonyl; Carbamoyl is especially mono- or di-C1-C4 alkylaminocarbonyl; Carbaroxy is especially phenoxycarbonyl.
• Groups R24 which can be split off by nucleophilic agents are, for example, halogen atoms, C1-C15 alkylsulfonyloxy groups, C7-C15 aralkylsulfonyloxy groups, C6-C15 arylsulfonyloxy groups and 1-pyridinyl radicals.
• the compounds can be prepared in a simple manner known from the literature.
• the secondary amines are e.g. with phosgene, the carbamic acid chlorides, which are then reacted with aromatic, heterocyclic nitrogen-containing compounds in the dark.
• the preparation of compound 3 is described in Chemical Reports 40, (1907), page 1831. Further information on the synthesis can be found in DE-OS 2 225 230, DE-OS 2 317 677 and DE-OS 2 439 551.
• JP-OSs 44 140/82 and 46 538/82 and JP-PS 50 669/83 Methods for the synthesis of these compounds are described in more detail in JP-OSs 44 140/82 and 46 538/82 and JP-PS 50 669/83.
• the binder to be cured used in the layers which are subjected to the curing process according to the invention is a proteinaceous binder which contains free amino groups and free carboxyl groups.
• Gelatin is a preferred example. Gelatin is mainly used in photographic recording materials as a binder for the light-sensitive substances, the coloring compounds and, if appropriate, other additives. Such recording materials often have a large number of different layers.
• the hardening by means of an immediate hardener is usually carried out in such a way that the hardening agent is applied as the last layer to the layers to be hardened, whereby further substances such as the UV absorbers, antistatic agents, matting agents and polymeric organic particles can be added to the hardening coating solution.
• the layer containing the hardening agent can be applied simultaneously with or after the casting of the remaining layers by means of cascade or curtain coaters.
• the casting temperature can be varied over a wide range, e.g. B. between 45 and 5 ° C, preferably between 38 and 18 ° C.
• UV absorbers which are liquid at room temperature question what R1 and R2 alkyl, aryl, alkoxy or aryloxy and R3 is hydrogen, halogen, alkyl, aryl, alkoxy, aryloxy, alkenyl, nitro or hydroxy mean.
• liquid UV absorbers according to the invention are given below.
• the UV absorbers that are liquid at room temperature can be used individually or as a mixture with one another.
• UV absorbers which are liquid at room temperature with UV absorbers which are solid at room temperature or to produce mixtures of UV absorbers which are solid at room temperature, as long as the mixture is liquid even at 15 ° C.
• the 2- (2-hydroxyphenyl) benzotriazole compounds are known and are described, for example, in US Pat. Nos. 3,754,919, 4,220,711 and 4,518,686.
• UV absorber They are preferably used in an amount of 0.01 to 5 g / m2, in particular 0.25 to 2 g / m2, in particular over all light-sensitive layers in the non-light-sensitive layer furthest from the support.
• the photographic material according to the invention contains in particular at least one blue-sensitive layer, to which at least one yellow coupler is assigned, at least a green-sensitive layer to which at least one purple coupler is assigned and at least one red-sensitive layer to which at least one cyan coupler is assigned.
• the at least one blue-sensitive layer is preferably arranged closest to the support and the at least one red-sensitive layer is most distant from the support.
• the silver halides of all light-sensitive layers preferably contain at least 80 mol% of chloride, in particular 95 to 100 mol% of chloride, 0 to 5 mol% of bromide and 0 to 1 mol% of iodide.
• the silver halide can be predominantly compact crystals, e.g. are regular cubic or octahedral or can have transitional forms.
• platelet-shaped crystals can preferably also be present, the average ratio of diameter to thickness of which is preferably at least 5: 1, the diameter of a grain being defined as the diameter of a circle with a circle content corresponding to the projected area of the grain.
• the layers can also have tabular silver halide crystals in which the ratio of diameter to thickness is greater than 5: 1, e.g. 12: 1 to 30: 1.
• the silver halide grains can also have a multi-layered grain structure, in the simplest case with an inner and an outer grain area (core / shell), the halide composition and / or other modifications, such as doping the one individual grain areas are different.
• the average grain size of the emulsions is preferably between 0.2 ⁇ m and 2.0 ⁇ m, the grain size distribution can be both homo- and heterodisperse.
• the emulsions can also contain organic silver salts, for example silver benzotriazolate or silver behenate.
• Two or more kinds of silver halide emulsions, which are prepared separately, can be used as a mixture.
• the photographic emulsions can be prepared using various methods (e.g. P. Glafkides, Chimie et Physique Photographique, Paul Montel, Paris (1967), GF Duffin, Photographic Emulsion Chemistry, The Focal Press, London (1966), VL Zelikman et al, Making and Coating Photographic Emulsion, The Focal Press, London (1966) from soluble silver salts and soluble halides.
• various methods e.g. P. Glafkides, Chimie et Physique Photographique, Paul Montel, Paris (1967), GF Duffin, Photographic Emulsion Chemistry, The Focal Press, London (1966), VL Zelikman et al, Making and Coating Photographic Emulsion, The Focal Press, London (1966) from soluble silver salts and soluble halides.
• the silver halide is preferably precipitated in the presence of the binder, for example the gelatin, and can be carried out in the acidic, neutral or alkaline pH range, silver halide complexing agents preferably being additionally used.
• the latter include, for example, ammonia, thioether, imidazole, ammonium thiocyanate or excess halide.
• the water-soluble silver salts and the halides are combined either in succession by the single-jet process or simultaneously by the double-jet process or by any combination of the two processes. Be dosing with increasing inflow rates is preferred, the "critical" feed rate, at which no new germs are being produced, should not be exceeded.
• the pAg range can vary within wide limits during the precipitation, preferably the so-called pAg-controlled method is used, in which a certain pAg value is kept constant or a defined pAg profile is traversed during the precipitation.
• so-called inverse precipitation with an excess of silver ions is also possible.
• the silver halide crystals can also grow through physical ripening (Ostwald ripening), in the presence of excess halide and / or silver halide complexing agent.
• the growth of the emulsion grains can even take place predominantly by Ostwald ripening, preferably a fine-grained, so-called Lippmann emulsion, mixed with a less soluble emulsion and redissolved on the latter.
• Salts or complexes of metals such as Cd, Zn, Pb, Tl, Bi, Ir, Rh, Fe can also be present during the precipitation and / or physical ripening of the silver halide grains.
• the precipitation can also be carried out in the presence of sensitizing dyes.
• Complexing agents and / or dyes can be rendered ineffective at any time, for example by changing the pH or by an oxidative treatment.
• Gelatin is preferably used as the binder. However, this can be replaced in whole or in part by other synthetic, semi-synthetic or naturally occurring polymers. Synthetic gelatin substitutes are, for example, polyvinyl alcohol, poly-N-vinylpyrolidone, polyacrylamides, polyacrylic acid and their derivatives, in particular their copolymers.
• Naturally occurring gelatin substitutes are, for example, other proteins such as albumin or casein, cellulose, sugar, starch or alginates, semisynthetic gelatin substitutes are generally modified natural products, cellulose derivatives such as hydroxyalkyl cellulose, carboxymethyl cellulose and phthalyl cellulose as well as gelatin derivatives, which are reacted with alkylating or acylating agents or by grafting of polymerizable monomers are examples of this.
• the binders should have a sufficient amount of functional groups so that enough resistant layers can be produced by reaction with suitable hardening agents.
• functional groups are in particular amino groups, but also carboxyl groups, hydroxyl groups and active methylene groups.
• the gelatin which is preferably used can be obtained by acidic or alkaline digestion.
• the preparation of such gelatins is described, for example, in The Science and Technology of Gelatine, published by AG Ward and A. Courts, Academic Press 1977, page 295 ff.
• the gelatin used in each case should contain the lowest possible level of photographically active impurities (inert gelatin). High viscosity, low swelling gelatins are particularly advantageous.
• the gelatin can be partially or completely oxidized.
• the soluble salts are removed from the emulsion, e.g. by pasta and washing, by flakes and washing, by ultrafiltration or by ion exchangers.
• the photographic emulsions may contain compounds to prevent fogging or to stabilize the photographic function during production, storage or photographic processing.
• Azaindenes are particularly suitable, preferably tetra- and penta-azaindenes, in particular those which are substituted by hydroxyl or amino groups.
• Such connections are e.g. B. von Birr, Z. Wiss. Phot. 47 (1952), pp. 2-58.
• Salts of metals such as mercury or cadmium, aromatic sulfonic or sulfinic acids such as benzenesulfinic acid, or nitrogen-containing heterocycles such as nitrobenzimidazole, nitroindazole, (subst.) Benzotriazoles or benzothiazolium salts can also be used as antifoggants.
• Heterocycles containing mercapto groups e.g. B.
• mercaptobenzthiazoles mercaptobenzimidazo le, mercaptotetrazoles, mercaptothiadiazoles, mercaptopyrimidines, these mercaptoazoles also containing a water-solubilizing group, for example a carboxyl group or sulfo group.
• a water-solubilizing group for example a carboxyl group or sulfo group.
• the stabilizers can be added to the silver halide emulsions before, during or after their ripening.
• the compounds can also be added to other photographic layers which are assigned to a halogen silver layer.
• the silver halide emulsions are usually chemically ripened, for example by the action of gold compounds or compounds of divalent sulfur.
• the photographic emulsion layers or other hydrophilic colloid layers of the light-sensitive material produced according to the invention can contain surface-active agents for various purposes, such as coating aids, to prevent electrical charging, to improve the sliding properties, to emulsify the dispersion, to prevent adhesion and to improve the photographic characteristics (eg acceleration of development, high contrast, sensitization etc.).
• the photographic emulsions can be spectrally sensitized using methine dyes or other dyes.
• Particularly suitable dyes are cyanine dyes, merocyanine dyes and complex merocyanine dyes.
• Color couplers for producing the blue-green partial color image are usually couplers of the phenol or ⁇ -naphthol type; suitable examples of this are known in the literature.
• Color couplers for producing the yellow partial color image are generally couplers with an open-chain ketomethylene group, in particular couplers of the ⁇ -acylacetamide type; Suitable examples of this are ⁇ -benzoylacetanilide couplers and ⁇ -pivaloylacetanilide couplers, which are also known from the literature.
• Color couplers for producing the purple partial color image are generally couplers of the 5-pyrazolone, indazolone or pyrazoloazole type; Suitable examples of this are described in large numbers in the literature.
• the color couplers can be 4-equivalent couplers, but also 2-equivalent couplers.
• the latter are derived from the 4-equivalent coupler in that they contain a substituent in the coupling site, which is split off during the coupling.
• the 2-equivalent couplers include those that are colorless and those that have an intense inherent color have, which disappears in the color coupling or is replaced by the color of the image dye produced (mask coupler) and white couplers, which essentially result in colorless products when reacted with color developer oxidation products.
• the 2-equivalent couplers also include those couplers that contain a detachable residue at the coupling point, which is released upon reaction with color developer oxidation products and thereby either directly or after one or more further groups have been split off from the primarily split off residue (eg DE-A-27 03-145, DE-A-28 55 697, DE-A-31 05 026, DE-A-33 19 428), a certain desired photographic activity unfolds, for example as a development inhibitor or accelerator.
• Examples of such 2-equivalent couplers are the known DIR couplers as well as DAR or. FAR coupler.
• DIR, DAR or FAR couplers Since with DIR, DAR or FAR couplers the effectiveness of the residue released during coupling is mainly desired and the color-forming properties of these couplers are less important, such DIR, DAR or FAR couplers are also suitable, which give essentially colorless products on coupling (DE-A-1 547 640).
• the cleavable residue can also be a ballast residue, so that upon reaction with color developer oxidation products coupling products are obtained which are diffusible or at least have a weak or restricted mobility (US Pat. No. 4,420,556).
• High molecular weight color couplers are described, for example, in DE-C-1 297 417, DE-A-24 07 569, DE-A-31 48 125, DE-A-32 17 200, DE-A-33 20 079, DE-A-33 24 932, DE-A-33 31 743, DE-A-33 40 376, EP-A-27 284, US-A-4 080 211.
• the high molecular weight color couplers are usually produced by polymerizing ethylenically unsaturated monomeric color couplers. However, they can also be obtained by polyaddition or polycondensation.
• the couplers or other compounds can be incorporated into silver halide emulsion layers by first preparing a solution, a dispersion or an emulsion of the compound in question and then adding it to the casting solution for the layer in question.
• the selection of the suitable solvent or dispersing agent depends on the solubility of the compound.
• Hydrophobic compounds can also be introduced into the casting solution using high-boiling solvents, so-called oil formers. Corresponding methods are described for example in US-A-2 322 027, US-A-2 801 170, US-A-2 801 171 and EP-AO 043 037.
• oligomers or polymers instead of the high-boiling solvents, oligomers or polymers, so-called polymeric oil formers, can be used.
• the compounds can also be introduced into the casting solution in the form of loaded latices.
• anionic water-soluble compounds e.g. dyes
• pickling polymers e.g. acrylic acid
• Suitable oil formers for other couplers and other compounds are e.g. Alkyl phthalates, phosphoric acid esters, citric acid esters, benzoic acid esters, alkylamides, fatty acid esters and trimesic acid esters.
• Each of the light-sensitive layers can consist of a single layer or can also comprise two or more silver halide emulsion partial layers (DE-C-1 121 470).
• the red-sensitive silver halide emulsion layers can be arranged closer to the support than the green-sensitive silver halide emulsion layers and, in turn, closer than the blue-sensitive layers, a non-light-sensitive yellow filter layer generally being located between green-sensitive layers and blue-sensitive layers.
• the green or Red-sensitive layers can be chosen without the yellow filter layer, other layer arrangements in which e.g. the blue sensitive, then the green sensitive and finally the red sensitive layers follow.
• the non-light-sensitive intermediate layers which are generally arranged between layers of different spectral sensitivity, can contain agents which prevent undesired diffusion of developer oxidation products from one light-sensitive layer into another light-sensitive layer with different spectral sensitization.
• sub-layers of the same spectral sensitization can differ with regard to their composition, in particular with regard to the type and amount of the silver halide grains.
• the sublayer with higher sensitivity will be located further from the support than the sublayer with lower sensitivity.
• Partial layers of the same spectral sensitization can be adjacent to one another or separated by other layers, for example by layers of different spectral sensitization.
• all highly sensitive and all low-sensitive layers can be combined to form a layer package (DE-A 1 958 709, DE-A 2 530 645, DE-A 2 622 922).
• the photographic material may further contain whites, spacers, formalin scavengers and others.
• Suitable white toners are e.g. in Research Disclosure December 1978, page 22 ff, Unit 17 643, Chapter V.
• binder layers in particular the most distant layer from the support, but also occasionally intermediate layers, especially if they are the most distant layer from the support during manufacture, may contain photographically inert particles of inorganic or organic nature, e.g. as a matting agent or as a spacer (DE-A 3 331 542, DE-A 3 424 893, Research Disclosure December 1978, page 22 ff, Unit 17 643, Chapter XVI).
• photographically inert particles of inorganic or organic nature e.g. as a matting agent or as a spacer (DE-A 3 331 542, DE-A 3 424 893, Research Disclosure December 1978, page 22 ff, Unit 17 643, Chapter XVI).
• the average particle diameter of the spacers is in particular in the range from 0.2 to 10 ⁇ m.
• the spacers are water-insoluble and can be alkali-insoluble or alkali-soluble, the alkali-soluble ones generally being removed from the photographic material in the alkaline development bath.
• suitable polymers are polymethyl methacrylate, copolymers of acrylic acid and methyl methacrylate and hydroxypropyl methyl cellulose hexahydrophthalate.
• polyethylene-coated paper is possible as a reflective support.
• the color photographic recording material according to the invention is developed with a color developer compound.
• All developer compounds which have the ability to react in the form of their oxidation product with color couplers to form azomethine dyes can be used as the color developer compound.
• Suitable color developer compounds are aromatic compounds of the p-phenylenediamine type containing at least one primary amino group, for example N, N-dialkyl-p-phenylenediamines, such as N, N-diethyl-p-phenylenediamine, 1- (N-ethyl-N-methylsulfonamidoethyl) -3 -methyl-p-phenylenediamine, 1- (N-ethyl-N-hydroxyethyl-3-methyl-p-phenylenediamine and 1- (N-ethyl-N-methoxyethyl) -3-methyl-p-phenylenediamine.
• N, N-dialkyl-p-phenylenediamines such as N, N-diethyl-p-phenylenediamine, 1- (N-ethyl-N-methylsulfonamidoethyl) -3 -methyl-p-phenylenediamine, 1- (N-eth
• the recording material according to the invention is particularly suitable for processing in an abbreviated processing process, for example in a processing process whose development step takes less than 3 minutes, preferably less than 1 minute, at temperatures between 25 and 45 ° C.
• Advantageous results are obtained especially when developing with benzyl alcohol-free developer baths.
• the color developer solution preferably contains ⁇ 0.01 mol / l bromide and ⁇ 5 ml / l benzyl alcohol.
• the material is usually bleached and fixed. Bleaching and fixing can be carried out separately or together.
• the usual compounds can be used as bleaching agents, e.g. Fe3+ salts and Fe3+ complex salts such as ferricyanides, dichromates, water-soluble cobalt complexes, etc.
• Particularly preferred are iron III complexes of aminopolycarboxylic acids, in particular e.g. Ethylenediaminetetraacetic acid, N-hydroxyethylethylenediamine triacetic acid, alkyliminodicarboxylic acids and corresponding phosphonic acids.
• Persulphates are also suitable as bleaching agents.
• compositions and processing times of the development and bleach-fix bath in which the material according to the invention is processed are given below. Watering is followed by usual drying.
• the material can also be treated with a conventional stabilizing bath.
• a) Color developer - 45 s - 35 ° C Triethanolamine 9.0 g / l NN-diethylhydroxylamine 4.0 g / l 3-methyl-4-amino-N-ethyl-N-methanesulfonamidoethyl aniline sulfate 5.0 g / l Potassium sulfite 0.2 g / l Potassium carbonate 22 g / l Potassium hydroxide 0.4 g / l Ethylenediaminetetraacetic acid di-Na salt 2.2 g / l Potassium chloride 2.5 g / l 1,2-Dihydroxybenzene-3,4,6-trisulfonic acid trisodium salt 0.3 g / l make up to 1,000 ml with water; pH 10.0 b) bleach-fix bath - 45 s - 35 ° C Ammoni
• a color photographic recording material which is suitable for a rapid processing process was produced by applying the following layers in the order given to a support on paper coated on both sides with polyethylene.
• the quantities given relate to 1 m2.
• the corresponding amounts of AgNO3 are given.
• UV-15 In the 5th layer, 0.6 g of UV-15 is used as a UV absorber with 0.4 g of DBP as an oil former. In the 7th layer 0.15 g UV-15 with 0.1 g DBP are used.
• the five structures are exposed behind a blue color separation filter with a 3 / 2 wedge and developed in accordance with the above information.
• the yellow color separation wedges obtained are measured with a densitometer, thereby determining sensitivity, shoulder gradation and maximum color density.
• the results are shown in the following overview: construction sensitivity gradation maximum color density 1 1.97 2.85 2.33 2nd 1.96 3.12 2.72 3rd 1.97 3.00 2.68 4th 1.97 3.15 2.70 5 1.96 2.98 2.64
• a wedge in which all three color separations were exposed in such a way that a neutral gray wedge was obtained showed the gradation and density in the yellow in the same way depending on the UV layer composition.
• the maximum density of purple was also 0.1 - 0.2 higher for superstructures 2 - 5.
• UV layers composed according to the invention result in a substantially better color density in the color structures.

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• 1988
  • 1988-06-04 DE DE3819082A patent/DE3819082A1/de not_active Withdrawn
• 1989
  • 1989-05-20 EP EP89109108A patent/EP0345514B1/fr not_active Expired - Lifetime
  • 1989-05-20 DE DE58908257T patent/DE58908257D1/de not_active Expired - Fee Related
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