EP0039338A1 - Material for obtaining photographic prints by dry process - Google Patents

Material for obtaining photographic prints by dry process

Info

Publication number
EP0039338A1
EP0039338A1 EP19800901790 EP80901790A EP0039338A1 EP 0039338 A1 EP0039338 A1 EP 0039338A1 EP 19800901790 EP19800901790 EP 19800901790 EP 80901790 A EP80901790 A EP 80901790A EP 0039338 A1 EP0039338 A1 EP 0039338A1
Authority
EP
European Patent Office
Prior art keywords
image
light
silver
layer
compounds
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19800901790
Other languages
German (de)
French (fr)
Inventor
Josef Rupp
Kanwaljit Purewal
Valentin Cavicchiolo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TONEC SA
Original Assignee
TONEC SA
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Filing date
Publication date
Application filed by TONEC SA filed Critical TONEC SA
Publication of EP0039338A1 publication Critical patent/EP0039338A1/en
Withdrawn legal-status Critical Current

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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
    • G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
    • G03C1/498—Photothermographic systems, e.g. dry silver

Definitions

  • the invention relates to an image-receiving material for the production of photographic copies in a dry way, which contains a light-insensitive silver salt.
  • the invention relates to a thermo-photographic copying material for producing copies by, by means of heat-activated reduction of a silver salt of an organic acid, in the presence of a light-sensitive reducing agent, which copying material contains in at least one layer a silver salt of an organic acid and a light-resistant reducing agent for the silver ion.
  • the photosensitive, reducing organic compound is first made inactive and non-transferable by light by exposing imagewise in the presence of a compound which contributes to inactivating the reducing compound.
  • the reducing compound still remaining in the unexposed or less strongly exposed areas is then transferred to the rapid receiving layer by heat.
  • connections are e.g. 1 (2H) -phala zinone, barbituric acid, saccharin and 2-mercaptobenzoxazole.
  • 1 (2H) phthalazinone is preferably used, since these images have a deep black color.
  • the invention is based on the object of stabilizing the image-receiving material in such a way that the background remains white at the uncopied areas, but the image still appears deep black.
  • Organic dihydroperoxides have proven to be particularly suitable, preferably 2,5-dimethylhexane 2,5 dihydroperoxide.
  • the oxidizing agents can be added to the layers in various amounts. The optimal amount depends on the desired effect and the layer composition. Generally, additions of 0.1-10 moles, preferably 0.5-5 moles, per mole of toner have been found to be most effective.
  • the oxidizing agents can be used in combination with the materials and compounds known for the respective heat development process, e.g. Reducing agents, binders, silver salts and other heavy metal salts, white pigments and stabilizers are used.
  • Silver compounds which have largely proven to be insensitive to light under the conditions of the process, e.g. the silver salts of aliphatic carboxylic acids with a thioether group or silver salts of long-chain fatty acids such as silver behenate, silver plaatitation, silver stearate described in the British patent GB P 1,111,492.
  • silver behenate and silver steate are preferable because, together with free behenic acid or stearic acid, they increase the moisture resistance of the image-receiving layer.
  • Reducing compounds which have proven suitable for the thermally initiated reduction of these silver salts include, for example, pyrogallol, 4-3tearoyl-pyrogallol, galloacetophenone, di-tert-butyl-pyrogallol, butyl gallate, dodecyl gallate, gallic acid, ammonium gallate, 2.5- Dihydroxy-benzoic acid, - And ß-naphthols, 1-hydroxy-naphthoic acid (2), phloroglucinol, catechol, hydroquinone, 1-phenyl-pyrazolidin-3-one, 4,4'-dihydroxybiphenyl, 1-hydroxy-4-methoxy-naphthalene , 1-Hydroxy-4-methoxy-dihydronaphthalene, o
  • reducing agents that are suitable for use at higher temperatures are pyrazolin-5-one compounds with at least one hydrogen atom in the 4-position. Suitable compounds of the latter type are described in German Offenlegungsschrift 2 117 053.
  • these reducing compounds are organic compounds in which an active hydrogen atom is bonded to a carbon, oxygen or nitrogen atom, which in turn is bonded to an atom of an aromatic or heterocyclic ring or in If the nitrogen atom can also be part of a heterocyclic ring.
  • Halogen-containing fluorescein dyes such as Erythrosine and the dyes described in German patent applications P 20 42 054.6, 20 42 531.4, 20 42 663.5 and 21.06 577.0.
  • compounds which act as auxiliary reducing agents can be used.
  • examples of such compounds are phenols with steric hindrance which actively participate in the reduction reaction when heated, such as 2,6-di-tert-butyl-4-methylphenol or 2,6-dicyclohexyl-p-cresol.
  • the image tone and the image density of the image-receiving material can be influenced by certain metal salts, e.g. Lead II stearate can be improved.
  • metal salts e.g. Lead II stearate
  • Such metal ion image intensifiers and their use are described in German Patent Specification 1,572,209.
  • the usual natural or synthetic film-forming polymers are suitable as binders for the light-sensitive layer or for the image-receiving layer, e.g. Proteins, in particular gelatin, cellulose derivatives, in particular cellulose ethers, cellulose esters or carboxymethyl cellulose, alginic acid and derivatives thereof, starch ether or gallactomannan, furthermore polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl acetate or wholly or partly saponified polyvinyl acetate vinyl acetate or copolymer of acrylonitrile and acrylamide, polyacrylic acid esters, polymethacrylic acid esters, polyethylene and others
  • the layers can be used as self-supporting layers or applied to a layer support.
  • Suitable supports are e.g. Paper, especially baryta or laminated paper, cellulose esters, e.g. Cellulose triacetate, polyester, in particular based on ethylene terephthalate, glass, etc.
  • the layers can also contain white pigments, such as zinc oxide, silicon dioxide or titanium dioxide as fillers, to improve the whiteness and to influence the adhesiveness of the layers.
  • white pigments such as zinc oxide, silicon dioxide or titanium dioxide as fillers
  • the reactants can also be placed in a fibrous web.
  • pigments, fillers, fusible substances such as Waxes, dyes and various other additives can be incorporated.
  • the silver salt and the toner are preferably mixed together before pouring. However, they can also be applied separately in adjacent layers from which the toner - e.g. when heating the carrier film - can diffuse to the metal salt.
  • the light sources customary in reproduction technology such as halogen lamps, iodine quartz lamps or incandescent lamps, can be used to expose the light-sensitive layers.
  • the spectral sensitivity of the light-sensitive material depends on the nature of the sensitizer dyes used.
  • the transfer of the image-forming compounds from the unexposed areas of the light-sensitive layers into the image-receiving layer takes place in the heat at temperatures between 80 and 200 ° C.
  • the heating can take place, for example, by guiding the exposed light-sensitive layer in contact with the image-receiving layer over hot plates or rollers or by irradiation with UR light.
  • the most favorable temperature and heating time of course depend on the nature of the image-forming compound or the composition of the light-insensitive silver salt-containing copying material; it can be determined by a few simple experiments. example
  • a transparent paper is coated in an amount of 25 g / m 2 with the following mixture
  • This mixture is ground in a ball mill for 24 h. To this ground mass are added before pouring
  • the ready-to-use mixture is then poured onto a paper support in an amount of 150 g / m 2 and dried.
  • the photosensitive layer is exposed to light.
  • the exposure lasts 30 seconds and is carried out with a tungsten filament lamp of 1500 watts, which is attached at a distance of 5 cm from the light-sensitive material.
  • the exposed layer is then 5 at 125 ° C. 5 Brought into contact with the image-receiving layer for seconds. Deep black images with high density are obtained, although the background is dotted gray-black.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

La couche contient un sel d'argent photoresistant. Afin d'obtenir des images noires bien contrastees sur fond blanc, la couche recoit un moyen d'oxydation, notamment un peroxide organique, qui contient le fond blanc.The layer contains a photoresist silver salt. In order to obtain well-contrasted black images on a white background, the layer receives an oxidation means, in particular an organic peroxide, which contains the white background.

Description

Bildempfangsmaterial für die Herstellung von photographischen Kopien auf trockenem Wege Image receiving material for the production of photographic copies by dry means
Die Erfindung bezieht sich auf ein Bildempfangsmaterial für die Herstellung von photographischen Kopien auf trockenem Wege, das ein lichtunempfindliches Silbersalz enthält. Insbesondere betrifft die Erfindung ein thermophotographisches Kopiermaterial zur Herstellung von Kopien, durch, mittels Wärme aktivierte Reduktion eines Silbersalzes einer organischen Säure, in Gegenwart eines lichtempfindlichen Reduktionsmittels, welches Kopiermaterial in mindestens einer Schicht ein Silbersalz einer organischen Säure und ein lichtbeständiges Reduktionsmittel für das Silberion enthält.The invention relates to an image-receiving material for the production of photographic copies in a dry way, which contains a light-insensitive silver salt. In particular, the invention relates to a thermo-photographic copying material for producing copies by, by means of heat-activated reduction of a silver salt of an organic acid, in the presence of a light-sensitive reducing agent, which copying material contains in at least one layer a silver salt of an organic acid and a light-resistant reducing agent for the silver ion.
Die lichtempfindliche, reduzierende organische Verbindung wird zunächst durch Licht inaktiv und nicht überträgbar gemacht, indem man bildmässig in Gegenwart einer Verbindung belichtet, die zur Inaktivierung der reduzierenden Verbindung beiträgt. Die in den unbelIchteten oder weniger stark belichteten Stellen noch verbleibende, reduzierende Verbindung wird dann durch Wärme auf die Eildempfangsschicht mit. dem Silbersalz einer organischen Säure und dem lichtbeständigen Reduktionsmittel für das Silberion übertragen, auf der die Farbbildung zustande kommt.The photosensitive, reducing organic compound is first made inactive and non-transferable by light by exposing imagewise in the presence of a compound which contributes to inactivating the reducing compound. The reducing compound still remaining in the unexposed or less strongly exposed areas is then transferred to the rapid receiving layer by heat. the silver salt of an organic acid and the light-resistant reducing agent for the silver ion on which the color is formed.
Bei diesem Verfahren werden nur gelbe bis hellbraune Silberbilder von geringem Kontrast erhalten. Es ist deshalb bekannt, dass man um Bilder mit genügender optischer Dichte zu erhalten, der BildempfangsSchicht sogenannte Toner zusetzt, die den Bildton nach braun bis schwarz verschieben.With this method, only yellow to light brown silver images of low contrast are obtained. It is therefore known that in order to obtain images with sufficient optical density, so-called toners are added to the image-receiving layer, which shift the image tone from brown to black.
Derartige Verbindungen sind z.B. 1 (2H)-Phtala zinon, Barbitursäure, Saccharin und 2-Mercaptobenzoxazol. Wobei vorzugsweise 1 (2H)-Phtalazinon eingesetzt wird, dadiese Bilder eine tiefschwarze Farbe aufweisen.Such connections are e.g. 1 (2H) -phala zinone, barbituric acid, saccharin and 2-mercaptobenzoxazole. 1 (2H) phthalazinone is preferably used, since these images have a deep black color.
Durch den Zusatz dieser Toner wird jedoch das Bildempfangsmaterial empfindlicher gemacht, so dass der Grund der Kopie ebenfalls eine leichte Schwärzung erleidet. Gewünscht wird aber ein schwarzes Bild auf weissem Grund.However, by adding these toners, the image-receiving material is made more sensitive, so the reason the copy also suffers from a slight blackening. However, a black image on a white background is desired.
Der Erfindung liegt nun die Aufgabe zu Grunde, das Bildempfangsmaterial so zu stabilisieren, dass an den unkopierten Stellen der Grund weiss bleibt, das Bild jedoch immer noch tief schwarz erscheint.The invention is based on the object of stabilizing the image-receiving material in such a way that the background remains white at the uncopied areas, but the image still appears deep black.
Es wurde nun gefunden, dass die Zugabe eines geeigneten Oxidationsmittels die Reduktion des Silbers an den unerwünschten Stellen verhindert, jedoch das Bild und die Bilddiehte nicht beeinflusst.It has now been found that the addition of a suitable oxidizing agent prevents the reduction of the silver at the undesired points, but does not affect the image and the image.
Als besonders geeignet haben sich organische Dihydroperoxide erwiesen, vorzugsweise 2,5-Dimethylhexan 2,5 dihydroperoxid.Organic dihydroperoxides have proven to be particularly suitable, preferably 2,5-dimethylhexane 2,5 dihydroperoxide.
Die Oxidationsmittel können den Schichten in verschiedenen Mengen zugesetzt werden. Die optimale Menge hängt von dem gewünschten Effekt und der Schichtzusammensetzung ab. Im Allgemeinen haben sich Zusätze von 0,1-10 Mol vorzugsweise 0,5-5 Mol pro Mol Toner als am wirksamsten erwiesen.The oxidizing agents can be added to the layers in various amounts. The optimal amount depends on the desired effect and the layer composition. Generally, additions of 0.1-10 moles, preferably 0.5-5 moles, per mole of toner have been found to be most effective.
Die Oxidationsmittel können in Kombination mit den, für das jeweilige Wärmeentwicklungsverfahren bekannten Materialien und Verbindungen, z.B. Reduktionsmitteln, Bindemitteln, Silbersalzen und sonstigen Schwermetallsalzen, Weis pigmenten und Stabilisatoren angewandt werden.The oxidizing agents can be used in combination with the materials and compounds known for the respective heat development process, e.g. Reducing agents, binders, silver salts and other heavy metal salts, white pigments and stabilizers are used.
Als bevorzugt brauchbar haben sich Silberverbindungen erwiesen, die unter den Bedingungen des Verfahrens weitgehend lichtunempfindlich sind, z.B. die in der englischen Patentschrift GB P 1.111.492 beschriebenen Silbersalze von aliphatischen Carbonsäuren mit einer Thioäthergruppierung oder Silbersalze von langkettigen Fettsäuren wie Silberbehenat, Silberplamitat, Silberstearat.Silver compounds which have largely proven to be insensitive to light under the conditions of the process, e.g. the silver salts of aliphatic carboxylic acids with a thioether group or silver salts of long-chain fatty acids such as silver behenate, silver plaatitation, silver stearate described in the British patent GB P 1,111,492.
Die Verwendung von Silberbehenat und Silberste rat ist vorzuziehen, da sie zusammen mit freier Behensäure, bzw. Stearinsäure, die Feuchtigkeitsbeständigkeit der Bildempfangsschicht erhöhen. Zu reduzierenden Verbindungen, die sich zur thermisch initiierten Reduktion dieser Silbersalze als geeignet erwiesen haben, gehören z.B. Pyrogallol, 4-3tearoyl- pyrogallol, Galloacetophenon, Di-tert.-butyl-pyrogallol, Butylgallat, Dodecylgallat, Gallussäure, Ammoniumgallat, 2,5-Dihydroxy-benzoesäure, - und ß -Naphthole, 1-Hydroxy- naphthoesäure-(2), Phloroglucinol, Brenzcatechin, Hydro- chinon, 1-Phenyl-pyrazolidin-3-on, 4,4'-Dihydroxybiphenyl, 1-Hydroxy-4-methoxy-naphthalin, 1-Hydroxy-4-methoxy-dihydro- naphthalin, o- und p-Phenylendiamin und AcetoacetonitrilDerivate, z.B. gemäss US-Patentschrift 3 619 239 oder deutscher Offenlegungschrift 2 010 837.The use of silver behenate and silver steate is preferable because, together with free behenic acid or stearic acid, they increase the moisture resistance of the image-receiving layer. Reducing compounds which have proven suitable for the thermally initiated reduction of these silver salts include, for example, pyrogallol, 4-3tearoyl-pyrogallol, galloacetophenone, di-tert-butyl-pyrogallol, butyl gallate, dodecyl gallate, gallic acid, ammonium gallate, 2.5- Dihydroxy-benzoic acid, - And ß-naphthols, 1-hydroxy-naphthoic acid (2), phloroglucinol, catechol, hydroquinone, 1-phenyl-pyrazolidin-3-one, 4,4'-dihydroxybiphenyl, 1-hydroxy-4-methoxy-naphthalene , 1-Hydroxy-4-methoxy-dihydronaphthalene, o- and p-phenylenediamine and acetoacetonitrile derivatives, for example according to US Pat. No. 3,619,239 or German Offenlegungsschrift 2,010,837.
Andere Reduktionsmittel, die sich zur Verwendung bei höherer Temperatur eignen, sind Pyrazolin-5-on- Verbindungen mit zumindest einem Wasserstoffatom in der 4- Steilung. Geeignete Verbindungen der letztgenannten Art sind in der deutschen Offenlegungsschrift 2 117 053 beschrieben.Other reducing agents that are suitable for use at higher temperatures are pyrazolin-5-one compounds with at least one hydrogen atom in the 4-position. Suitable compounds of the latter type are described in German Offenlegungsschrift 2 117 053.
Wie aus der vorstehenden Aufzählung zu ersehen ist, handelt es sich bei diesen reduzierenden Verbindungen um organische Verbindungen, bei denen ein aktives Wasserstoffatom an ein Kohlenstoff-, Sauerstoff- oder Stickstoffatom gebunden ist, das seinerseits an ein Atom eines aromatischen oder heterocyclischen Ringes gebunden oder im Falle des Stickstoffatoms auch Bestandteil eines heterocyclischen Ringes sein kann.As can be seen from the above list, these reducing compounds are organic compounds in which an active hydrogen atom is bonded to a carbon, oxygen or nitrogen atom, which in turn is bonded to an atom of an aromatic or heterocyclic ring or in If the nitrogen atom can also be part of a heterocyclic ring.
Verbindungen, die zur Photo-Desaktivierung dieser reduzierenden Verbindungen beitragen können, sind z.B. in der britischen Patentschrift 1 002 350 beschrieben. Besonders gut geeignet sind halogenhaltige Fluoreszein-Farbstoffe, wie z.B. Erythrosin und die in den deutschen Patentanmeldung P 20 42 054.6, 20 42 531.4, 20 42 663.5 und 21.06 577.0 beschriebenen Farbstoffe.Compounds that can contribute to the photo-deactivation of these reducing compounds are e.g. in British Patent 1 002 350. Halogen-containing fluorescein dyes, such as Erythrosine and the dyes described in German patent applications P 20 42 054.6, 20 42 531.4, 20 42 663.5 and 21.06 577.0.
Zusätzlich zu den oben angegebenen Reduktionsmitteln können Verbindungen zur Anwendung kommen, die als Hilfs-Reduktionsmittel wirken. Beispiele für derartige Verbindungen sind Phenole mit sterischer Hinderung, die beim Erhitzen aktiv an der Reduktionsreaktion teilnehmen, wie 2,6-Di-tert.-butyl- 4-methyl-phenol oder 2,6-Dicyclohexyl-p-cresol.In addition to the reducing agents mentioned above, compounds which act as auxiliary reducing agents can be used. Examples of such compounds are phenols with steric hindrance which actively participate in the reduction reaction when heated, such as 2,6-di-tert-butyl-4-methylphenol or 2,6-dicyclohexyl-p-cresol.
Ferner kann der Bildton und die Bilddichte de Bildempfangsmaterials durch bestimmte Metallsalze, z.B. Blei II-Stearat verbessert werden. Derartige Metallionen-Bildverstärker und ihre Anwendung sind in der deutschen Auslegeschrift 1 572 209 beschrieben.Furthermore, the image tone and the image density of the image-receiving material can be influenced by certain metal salts, e.g. Lead II stearate can be improved. Such metal ion image intensifiers and their use are described in German Patent Specification 1,572,209.
Als Bindemittel für die lichtempfindliche Schicht bzw. für die Bildempfangsschicht sind die üblichen natürlichen oder synthetischen filmbildenden Polymeren geeignet, z.B. Proteine, insbesondere Gelatine, Cellulosederivate, insbesondere Celluloseäther, Celluloseester oder Carboxymethylcellulose, Alginsäure und Derivate davon, Stärkeäther oder Gallactomannan, ferner Polyvinylalkohol, Polyvinylpyrrolidon, Polyvinylchlorid, Copolymerisate von Vinylchlorid und Vinylacetat, Polyvinylacetat oder ganz oder teilweise verseiftes Polyvinylacetat bzw. Copolymerisate von Vinylacetat, Mischpolymerisate des Acrylnitrils und Acrylamids, Polyacrylsäureester, Polymethacrylsäureester, Polyäthylen u.a.The usual natural or synthetic film-forming polymers are suitable as binders for the light-sensitive layer or for the image-receiving layer, e.g. Proteins, in particular gelatin, cellulose derivatives, in particular cellulose ethers, cellulose esters or carboxymethyl cellulose, alginic acid and derivatives thereof, starch ether or gallactomannan, furthermore polyvinyl alcohol, polyvinylpyrrolidone, polyvinyl chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl acetate or wholly or partly saponified polyvinyl acetate vinyl acetate or copolymer of acrylonitrile and acrylamide, polyacrylic acid esters, polymethacrylic acid esters, polyethylene and others
Die Schichten können als selbsttragende Schich ten angewendet werden oder auf einen Schichtträger aufgetragen werden. Geeignete Schichtträger sind z.B. Papier, ins besondere barytiertes oder kaschiertes Papier, Celluloseester, z.B. Cellulosetriacetat, Polyester, insbesondere auf der Basis von Aethylenterephthalat, Glas usw.The layers can be used as self-supporting layers or applied to a layer support. Suitable supports are e.g. Paper, especially baryta or laminated paper, cellulose esters, e.g. Cellulose triacetate, polyester, in particular based on ethylene terephthalate, glass, etc.
Bei der Auswahl der Bindemittel für die lichtempfindliche Schicht und die Bildempfangsschicht ist darauf zu achten, dass in der Wärme die Schichten nicht kleben. Diese Schwierigkeiten sind jedoch von anderen bekannten Verfahren, z.B. dem Silbersalzdiffusionsverfahren oder Wärmeεntwicklungs verfahren, bekannt und unter Ausnutzung der Erfahrung auf diesen bekannten Gebieten ohne weiteres zu lösen. Die Schichten können auch Weisspigmente, wie Zinkoxyd, Siliciumdioxyd oder Titandioxyd als Füllstoffe, zur Verbesserung der Weissen und zur Beeinflussung der Klebeeignung der Schichten enthalten. Derartige Schichten sind in den US-Patentschriften 3074 809 und 3107 174 beschrieben.When selecting the binders for the light-sensitive layer and the image-receiving layer, care must be taken to ensure that the layers do not stick in the heat. However, these difficulties are known from other known processes, for example the silver salt diffusion process or heat development process, and can be easily solved using the experience in these known fields. The layers can also contain white pigments, such as zinc oxide, silicon dioxide or titanium dioxide as fillers, to improve the whiteness and to influence the adhesiveness of the layers. Such layers are described in U.S. Patents 3,074,809 and 3,107,174.
In Abwesenheit eines Bindemittels können die Reaktionsteilnehmer auch in eine faserige Bahn eingebracht werden. Um angestrebte Spezialeffekte zu erhalten, können Pigmente, Füllstoffe, schmelzbare Substanzen, wie z.B. Wachse, Farbstoffe und verschiedene andere Zusätze einverleibt werden.In the absence of a binder, the reactants can also be placed in a fibrous web. To obtain the desired special effects, pigments, fillers, fusible substances such as Waxes, dyes and various other additives can be incorporated.
Das Silbersalz und der Toner werden vorzugsweise vor dem Vergiessen miteinander vermischt. Sie können jedoch auch getrennt in benachbarten Schichten aufgebracht werden, aus denen der Toner - z.B. beim Erhitzen der Trägerfolie - zum Metallsalz diffundieren kann. Zur Belichtung der lichtempfindlichen Schichten können die in der Reproduktionstechnik üblichen Lichtquellen, wie Halogenlampen, Jodquarzlampen oder Glühlampen verwendet werden. Die spektrale Empfindlichkeit des lichtempfindlichen Materials hängt von der Natur der verwendeten Sensibilisatorfarbstoffe ab.The silver salt and the toner are preferably mixed together before pouring. However, they can also be applied separately in adjacent layers from which the toner - e.g. when heating the carrier film - can diffuse to the metal salt. The light sources customary in reproduction technology, such as halogen lamps, iodine quartz lamps or incandescent lamps, can be used to expose the light-sensitive layers. The spectral sensitivity of the light-sensitive material depends on the nature of the sensitizer dyes used.
Die Ueberführung der bilderzeugenden Verbindungen von den unbelichteten Stellen der lichtempfindlichen Schichten in die BildempfangsSchicht geschieht in der Wärme bei Temperaturen zwischen 80 und 200°C. Die Erwärmung kann erfolgen z.B. durch Führung der belichteten lichtempfindlichen Schicht in Kontakt mit der Bildempfangsschicht über heisse Platten oder Walzen oder auch durch Bestrahlung mit UR-Licht. Die günstigste Temperatur und Erwärmungszeit hängt selbstverständlich von der Natur der bilderzeugenden Verbindung bzw. der Zusammensetzung des lichtunempfindlichen silbersalzhaltigen Kopiermaterials ab; sie kann durch wenige einfache Versuche ermittelt werden. BeispielThe transfer of the image-forming compounds from the unexposed areas of the light-sensitive layers into the image-receiving layer takes place in the heat at temperatures between 80 and 200 ° C. The heating can take place, for example, by guiding the exposed light-sensitive layer in contact with the image-receiving layer over hot plates or rollers or by irradiation with UR light. The most favorable temperature and heating time of course depend on the nature of the image-forming compound or the composition of the light-insensitive silver salt-containing copying material; it can be determined by a few simple experiments. example
A . Herstellung des lichtempfindlichen MaterialsA. Production of the photosensitive material
Ein Transparentpapier wird in einer Menge von 25 g/m2 mit der folgenden Mischung beschichtetA transparent paper is coated in an amount of 25 g / m 2 with the following mixture
(p-Chlorphenyl)-acetoacetonitrile 1, 0 g(p-Chlorophenyl) acetoacetonitrile 1.0 g
Erythrosin 440 mgErythrosin 440 mg
Aethylce-Llulose 50, 0 gAethylce-Llulose 50.0 g
Methyläthylketon 500 g anschliessend wie üblich trocknenThen dry methyl ethyl ketone 500 g as usual
B. Herstellung des BildempfangsmaterialsB. Preparation of Image Receiving Material
Aethylacetat 40 gEthyl acetate 40 g
Stearinsäure 4 g Silberstearat 5 gStearic acid 4 g silver stearate 5 g
Polyäthylacrylat 5 g Phtalazinon 1 gPolyethyl acrylate 5 g phthalazinone 1 g
Diese Mischung wird 24 h in einer Kugelmühle gemahlen. Zu dieser gemahlenen Masse werden vor dem Vergiessen zugegebenThis mixture is ground in a ball mill for 24 h. To this ground mass are added before pouring
Aceton 20 gAcetone 20 g
2,6-Di-cyclohexyl-p-Kresol 1 g2,6-di-cyclohexyl-p-cresol 1 g
Die gebrauchsfertige Mischung wird dann in einer Menge von 150 g/m2 auf einen Papierträger gegossen und getrocknet.The ready-to-use mixture is then poured onto a paper support in an amount of 150 g / m 2 and dried.
Verarbeitung : Die lichtempfindliche Schicht wird bild mässig belichtet. Die Belichtung dauert 30 Sekunden und wird mit einer Wolframfadenlampe von 1500 Watt durchgeführt, die in einem Abstand von 5 cm vom lichtempfindlichen Material angebracht ist.Processing: The photosensitive layer is exposed to light. The exposure lasts 30 seconds and is carried out with a tungsten filament lamp of 1500 watts, which is attached at a distance of 5 cm from the light-sensitive material.
Anschliessend wird die belichtete Schicht bei 125°C 5 Sek. lang mit der Bildempfangsschicht in Kontakt gebracht. Es werden tief schwarze Bilder mit Hoher Dichte erhalten, wobei jedoch der Grund grau-schwarz punkiert ist.The exposed layer is then 5 at 125 ° C. 5 Brought into contact with the image-receiving layer for seconds. Deep black images with high density are obtained, although the background is dotted gray-black.
Falls man wie oben verfährt, jedoch vor dem Vergiessen 1,5 g 2,5-Dimethylhexan-2,5-dihydroperoxid zugibt, erhält man ebenfalls ein tief schwarzes Bild, jedoch auf weissem Grund. If the procedure is as above, but 1.5 g of 2,5-dimethylhexane-2,5-dihydroperoxide is added before casting, a deep black image is also obtained, but on a white background.

Claims

PATENTANSPRUECHE PATENT CLAIMS
1. Bildempfangsmaterial für die Herstellung von photographischen Kopien auf trockenem Wege mit einer Schicht, die ein lichtunempfindliches Silbersalz enthält, dadurch ge kennzeichnet, dass diese Schicht ein Oxidationsmittel enthält.1. Image receiving material for the production of photographic copies in a dry way with a layer containing a light-insensitive silver salt, characterized in that this layer contains an oxidizing agent.
2. Material nach Anspruch 1, dadurch gekennzeichnet, dass das Oxidationsmittel ein organisches Peroxid ist.2. Material according to claim 1, characterized in that the oxidizing agent is an organic peroxide.
3. Material nach Anspruch 2, dadurch gekennzeichnet, dass es 2,5-Dimethylhexan-2,5-dihydroperoxid enthält. 3. Material according to claim 2, characterized in that it contains 2,5-dimethylhexane-2,5-dihydroperoxide.
EP19800901790 1979-09-28 1980-09-26 Material for obtaining photographic prints by dry process Withdrawn EP0039338A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH872479 1979-09-28
CH8724/79 1979-09-28

Publications (1)

Publication Number Publication Date
EP0039338A1 true EP0039338A1 (en) 1981-11-11

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EP19800901790 Withdrawn EP0039338A1 (en) 1979-09-28 1980-09-26 Material for obtaining photographic prints by dry process

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EP (1) EP0039338A1 (en)
WO (1) WO1981000922A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486246A1 (en) * 1990-11-14 1992-05-20 Canon Kabushiki Kaisha Heat-developable photosensitive material

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3798039A (en) * 1972-03-08 1974-03-19 Nashua Corp Copy sheet containing silver soap and an organic peroxygen oxidizing compound
GB1455271A (en) * 1973-04-19 1976-11-10 Kodak Ltd Heat-processable-radiation sensitive material
JPS5435488B2 (en) * 1974-01-08 1979-11-02
BE834856A (en) * 1974-10-24 1976-02-16 PROCESS FOR PREPARING COMPOSITIONS AND PHOTOSENSITIVE ELEMENTS DEVELOPABLE BY HEAT

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8100922A1 *

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WO1981000922A1 (en) 1981-04-02

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