EP0039338A1 - Materiau permettant d'obtenir des copies photographiques par voie seche - Google Patents

Materiau permettant d'obtenir des copies photographiques par voie seche

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Withdrawn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)
English (en)
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by TONEC SA filed Critical TONEC SA
Publication of EP0039338A1 publication Critical patent/EP0039338A1/fr
Withdrawn legal-status Critical Current

Links

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.

Landscapes

  • 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.
EP19800901790 1979-09-28 1980-09-26 Materiau permettant d'obtenir des copies photographiques par voie seche Withdrawn EP0039338A1 (fr)

Applications Claiming Priority (2)

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

Publications (1)

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

Family

ID=4343995

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901790 Withdrawn EP0039338A1 (fr) 1979-09-28 1980-09-26 Materiau permettant d'obtenir des copies photographiques par voie seche

Country Status (2)

Country Link
EP (1) EP0039338A1 (fr)
WO (1) WO1981000922A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0486246A1 (fr) * 1990-11-14 1992-05-20 Canon Kabushiki Kaisha Matériel photosensible développable à chaud

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 (fr) * 1974-01-08 1979-11-02
DE2547723A1 (de) * 1974-10-24 1976-04-29 Fuji Photo Film Co Ltd Verfahren zur herstellung thermisch entwickelbarer, lichtempfindlicher mischungen

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
WO1981000922A1 (fr) 1981-04-02

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19811116

RIN1 Information on inventor provided before grant (corrected)

Inventor name: RUPP, JOSEF

Inventor name: PUREWAL, KANWALJIT

Inventor name: CAVICCHIOLO, VALENTIN