EP0624482B1 - Lichtstabilisatoren für Farbstoffe für das Farbstoffsübertragungsaufzeichnungsverfahren - Google Patents

Lichtstabilisatoren für Farbstoffe für das Farbstoffsübertragungsaufzeichnungsverfahren Download PDF

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Publication number
EP0624482B1
EP0624482B1 EP19940201166 EP94201166A EP0624482B1 EP 0624482 B1 EP0624482 B1 EP 0624482B1 EP 19940201166 EP19940201166 EP 19940201166 EP 94201166 A EP94201166 A EP 94201166A EP 0624482 B1 EP0624482 B1 EP 0624482B1
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Prior art keywords
dye
group
substituted
light
stabilizer
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EP19940201166
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English (en)
French (fr)
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EP0624482A1 (de
Inventor
Wilhelmus C/O Agfa-Gevaert N.V. Janssens
Luc C/O Agfa-Gevaert N.V. Vanmaele
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Agfa Gevaert NV
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Agfa Gevaert NV
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/423—Intermediate, backcoat, or covering layers characterised by non-macromolecular compounds, e.g. waxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5227—Macromolecular coatings characterised by organic non-macromolecular additives, e.g. UV-absorbers, plasticisers, surfactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/385—Contact thermal transfer or sublimation processes characterised by the transferable dyes or pigments
    • B41M5/39—Dyes containing one or more carbon-to-nitrogen double bonds, e.g. azomethine

Definitions

  • the present invention relates to ecologically acceptable light-stabilizers for use in thermal dye sublimation transfer and to a method of forming a light-fast dye image by thermal dye sublimation transfer.
  • Thermal dye transfer methods include thermal dye sublimation transfer also called thermal dye diffusion transfer. This is a recording method in which a dye-donor element provided with a dye layer containing sublimating dyes having heat transferability is brought into contact with a receiver sheet and selectively, in accordance with a pattern information signal, heated with a thermal printing head provided with a plurality of juxtaposed heat-generating resistors, whereby dye is transferred from the selectively heated regions of the dye-donor element to the receiver sheet and forms a pattern thereon, the shape and density of which are in accordance with the pattern and intensity of heat applied to the dye-donor element.
  • a dye-donor element for use according to thermal dye sublimation transfer usually comprises a very thin support e.g. a polyester support, one side of which is covered with a dye layer comprising the printing dyes.
  • a very thin support e.g. a polyester support, one side of which is covered with a dye layer comprising the printing dyes.
  • an adhesive or subbing layer is provided between the support and the dye layer.
  • the opposite side of the support is covered with a slipping layer that provides a lubricated surface against which the thermal printing head can pass without suffering abrasion.
  • An adhesive layer may be provided between the support and the slipping layer.
  • the dye layer can be a monochromic dye layer or it may comprise sequential repeating areas of differently coloured dyes e.g. dyes having a cyan, magenta, yellow, and optionally black hue.
  • a dye-donor element containing three or more primary colour dyes is used, a multicolour image can be obtained by sequentially performing the dye transfer process steps for each colour.
  • a primary coloured dye layer e.g. a magenta or cyan or yellow dye layer may comprise only one primary coloured dye (a magenta, cyan, or yellow dye respectively) or may comprise a mixture of two or more primary coloured dyes of the same hue (two magenta, two cyan, or two yellow dyes respectively).
  • Imaging dyes are unstable to light to some extent. Dyes are indeed known to degrade through a number of pathways, which often involve dye triplet states, radicals and/or singlet oxygen. Any improvement in the light stability of dyes is highly desirable therefore.
  • UV-absorbers are used frequently in a top layer to shield dyes from the harmful influence of ultraviolet radiation.
  • a dye-donor element for use according to thermal dye sublimation transfer, said dye-donor element comprising a support having thereon a dye layer comprising at least one dye and a binder, wherein said dye layer or a top layer thereon also comprises a light-stabilizer for said at least one dye, said light-stabilizer being a leuco-indoaniline dye preferably corresponding to the following general formula : wherein :
  • the present invention also provides a method of forming a light-fast dye image by image-wise heating a dye-donor element comprising a dye layer comprising a binder and at least one dye, and in said dye layer or in a layer on top of said dye layer a light-stabilizer for said dye, said light-stabilizer being a leuco-indoaniline dye preferably corresponding to the above general formula, and causing transfer of the image-wise heated dye and light-stabilizer to a receiver sheet.
  • the method comprises forming a light-fast dye image by image-wise heating a dye-donor element comprising a dye layer comprising a binder and at least one dye, and causing transfer of the image-wise heated dye to a receiver sheet, wherein said receiver sheet comprises as a light-stabilizer for the transferred dye, a leuco-indoaniline dye preferably corresponding to the above general formula.
  • the present invention further provides a dyed receiver sheet comprising at least one dye and at least one light-stabilizer for said dye, wherein said dye and said light-stabilizer are present in an image-wise distribution produced by thermal dye sublimation transfer from a dye-donor element and said light-stabilizer dye is a leuco-indoaniline dye preferably according to the above general formula.
  • the present invention also provides a receiver sheet for receiving an image-wise distribution of dye by thermal dye sublimation transfer from a dye-donor element, wherein said receiver sheet comprises as a light-stabilizer for said dye a leuco-indoaniline dye.
  • the compounds corresponding to the above general formula can be prepared by reducing the corresponding dye and, if necessary, derivatizing the leuco dye with acyl chlorides. This will become apparent from the preparation examples given hereinafter.
  • Compound S.05 is prepared according to the following reaction scheme : 10 g (0.025 mol) of Compound A prepared as described in US 4,987,119 is added under nitrogen atmosphere to a solution of 1.5 g of sodium cyanide and 0.5 ml of water in 50 ml of 1,1,1-trichloroethane. The solution is refluxed for 1 h. 4.2 ml of triethylamine and 2.1 ml of acetyl chloride are added and the hot solution is stirred for 1 h. The solution is washed twice with 0.1 N hydrochloric acid, once with a saturated sodium hydrogen carbonate solution, and once with a saturated sodium chloride solution. The solution is dried over sodium sulfate, filtered, concentrated under reduced pressure, and purified by column chromatography. Yield : 4.7 g of pure Compound S.05
  • Compound S.09 can be prepared as described in JP 02-238059.
  • Any dye can be used in the dye layer of the dye-donor element of the present invention provided it is transferable by the action of heat to the receiver sheet and provided it is not altered chemically by the light-stabilizer by said action of heat.
  • the dye layer can be a monochromic dye layer or it may comprise sequential repeating areas of differently coloured dyes.
  • the dye layer is a monochromic dye layer
  • the light-stabilizer may be incorporated therein.
  • the dye layer consists of repeating areas of different dyes the light-stabilizer may be incorporated together with the different dyes in said repeating areas. In that case the light-stabilizer is transferred together with dye during the same heating cycle.
  • Dmin minimum density
  • Dmax maximum density
  • the light-stabilizer can be used in amounts of 10 to 200 % by weight, preferably 20 to 150 % by weight, calculated on the weight of dye.
  • the dye layer of the dye-donor element is formed preferably by adding the dyes, the light-stabilizer, a polymeric binder medium, and other optional components to a suitable solvent or solvent mixture, dissolving or dispersing these ingredients to form a coating composition that is applied to a support, which may have been provided first with an adhesive or subbing layer, and dried.
  • the dye layer thus formed generally has a thickness of about 0.2 to 5.0 ⁇ m, preferably 0.4 to 2.0 ⁇ m, and the amount ratio of dye to binder generally ranges from 9:1 to 1:3 weight, preferably from 3:1 to 1:2 by weight.
  • polymers can be used as polymeric binder : cellulose derivatives, such as ethyl cellulose, hydroxyethyl cellulose, ethylhydroxy cellulose, ethylhydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose nitrate, cellulose acetate formate, cellulose acetate hydrogen phthalate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate pentanoate, cellulose acetate benzoate, cellulose triacetate; vinyl-type resins and derivatives, such as polyvinyl alcohol, polyvinyl acetate, polyvinyl butyral, copolyvinyl butyral-vinyl acetal-vinyl alcohol, polyvinyl pyrrolidone, polyvinyl acetoacetal, polyacrylamide; polymers and copolymers derived from acrylates and acrylate derivatives, such as polyacrylic acid,
  • the dye-donor element of the present invention can be used for the recording of a coloured image together with primary colour dye-donor elements comprising a magenta dye or a mixture of magenta dyes, a cyan dye or a mixture of cyan dyes, and a yellow dye or a mixture of yellow dyes respectively.
  • the light-stabilizers can be used alone or mixed with one another, or even mixed with other primary colour dyes.
  • the dye layer and/or the layer comprising the light-stabilizer may also contain other additives, such as curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoaming agents, viscosity-controlling agents, these and other ingredients having been described more fully in EP 133,011, EP 133,012, EP 111,004, and EP 279,467.
  • additives such as curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoaming agents, viscosity-controlling agents, these and other ingredients having been described more fully in EP 133,011, EP 133,012, EP 111,004, and EP 279,467.
  • any material can be used as the support for the dye-donor element provided it is dimensionally stable and capable of withstanding the temperatures involved, up to 400°C over a period of up to 20 ms, and is yet thin enough to transmit heat applied on one side through to the dye on the other side to effect transfer to the receiver sheet within such short periods, typically from 1 to 10 ms.
  • Such materials include polyesters such as polyethylene terephthalate, polyamides, polyacrylates, polycarbonates, cellulose esters, fluorinated polymers, polyethers, polyacetals, polyolefins, polyimides, glassine paper and condenser paper.
  • Preference is given to a support comprising polyethylene terephthalate. In general, the support has a thickness of 2 to 30 ⁇ m.
  • the support may also be coated with an adhesive of subbing layer, if desired.
  • the dye layer and/or the layer comprising the light-stabilizer can be coated or printed by a printing technique such as a gravure process.
  • a dye-barrier layer comprising a hydrophilic polymer may be provided between the support and the dye layer of the dye-donor element to enhance the dye transfer densities by preventing wrong-way transfer of dye backwards to the support.
  • the dye barrier layer may contain any hydrophilic material that is useful for the intended purpose.
  • gelatin polyacrylamide, polyisopropyl acrylamide, butyl methacrylate-grafted gelatin, ethyl methacrylate-grafted gelatin, ethyl acrylate-grafted gelatin, cellulose monoacetate, methylcellulose, polyvinyl alcohol, polyethyleneimine, polyacrylic acid, a mixture of polyvinyl alcohol and polyvinyl acetate, a mixture of polyvinyl alcohol and polyacrylic acid, or a mixture of cellulose monoacetate and polyacrylic acid.
  • Suitable dye barrier layers have been described in e.g. EP 227,091 and EP 228,065.
  • Certain hydrophilic polymers e.g.
  • the reverse side of the dye-donor element has been coated with a slipping layer to prevent the printing head from sticking to the dye-donor element.
  • a slipping layer would comprise a lubricating material such as a surface-active agent, a liquid lubricant, a solid lubricant or mixtures thereof, with or without a polymeric binder.
  • the surface-active agents may be any agents known in the art such as carboxylates, sulfonates, phosphates, aliphatic amine salts, aliphatic quaternary ammonium salts, polyoxyethylene alkyl ethers, polyethylene glycol fatty acid esters, fluoroalkyl C 2 -C 20 aliphatic acids.
  • liquid lubricants include silicone oils, synthetic oils, saturated hydrocarbons, and glycols.
  • solid lubricants include various higher alcohols such as stearyl alcohol, fatty acids and fatty acid esters. Suitable slipping layers have been described in e.g. EP 138,483, EP 227,090, US 4,567,113, US 4,572,860, US 4,717,711.
  • the slipping layer comprises copolystyrene-acrylonitrile or a styrene-acrylonitrile-butadiene copolymer or a mixture thereof or a polycarbonate as described in EP-A-0 527 520, as binder and a polysiloxane-polyether copolymer or polytetrafluoroethylene or a mixture thereof as lubicrant in an amount of 0.1 to 10% by weight of the binder or binder mixture.
  • the receiver sheet for receiving an image-wise distribution of dye by thermal dye sublimation transfer from a dye-donor element may also comprise a light-stabilizer, said light stabilizer being a leuco-indoaniline dye
  • the support for the receiver sheet that is used with the dye-donor element may be a transparent film of e.g. polyethylene terephthalate, a polyether sulfone, a polyimide, a cellulose ester or a polyvinyl alcohol-co-acetal.
  • the support may also be a reflective one such as a baryta-coated paper, polyethylene-coated paper or white polyester i.e. white-pigmented polyester. Blue-coloured polyethylene terephthalate film can also be used as support.
  • the dye-image-receiving layer may comprise e.g. a polycarbonate, a polyurethane, a polyester, a polyamide, polyvinyl chloride, copolystyrene-acrylonitrile, polycaprolactone, or mixtures thereof as binder.
  • the dye-image receiving layer may also comprise a heat-cured product of poly(vinyl chloride/co-vinyl acetate/co-vinyl alcohol) and polyisocyanate. Suitable dye-image-receiving layers have been described in e.g. EP 133,011, EP 133,012, EP 144,247, EP 227,094, and EP 228,066.
  • the light-stabilizer may be present in a dye-image-receiving layer comprising a binder. In that case the dye-donor element need not comprise the light-stabilizer.
  • the light-stabilizer can be present in the dye-image-receiving layer in an amount of 10 to 100% by weight calculated on the weight of binder present in said dye-image-receiving layer.
  • singlet oxygen quenchers such as HALS-compounds (Hindered Amine Light-stabilizers) and/or antioxidants can be incorporated into the dye-image-receiving layer.
  • the dye layer of the dye-donor element or the dye-image-receiving layer of the receiver sheet may also contain a releasing agent that aids in separating the dye-donor element from the receiver sheet after transfer.
  • the releasing agents can also be incorporated in a separate layer on at least part of the dye layer and/or of the dye-image-receiving layer.
  • Suitable releasing agents are solid waxes, fluorine- or phosphate-containing surface-active agents and silicone oils. Suitable releasing agents have been described in e.g. EP 133,012, JP 85/19,138, and EP 227,092.
  • the dye-donor elements according to the invention are used to form a dye transfer image, which process comprises placing the dye layer of the dye-donor element in face-to-face relation with the dye-image-receiving layer of the receiver sheet and image-wise heating from the back of the dye-donor element.
  • the transfer of the dye is accomplished by heating for about several milliseconds at a temperature of 400°C.
  • a monochromic dye transfer image is obtained.
  • a multicolour image can be obtained by using a dye-donor element containing three or more primary colour dyes and sequentially performing the process steps described above for each colour.
  • the above sandwich of dye-donor element and receiver sheet is formed on three occasions during the time when heat is applied by the thermal printing head. After the first dye has been transferred, the elements are peeled apart.
  • a second dye-donor element (or another area of the dye-donor element with a different dye area) is then brought in register with the dye-receiving element and the process is repeated.
  • the third colour and optionally further colours are obtained in the same manner.
  • thermal heads In addition to thermal heads, laser light, infrared flash, or heated pens can be used as the heat source for supplying heat energy.
  • Thermal printing heads that can be used to transfer dye from the dye-donor elements of the present invention to a receiver sheet are commercially available.
  • the dye layer or another layer of the dye element has to contain a compound that absorbs the light emitted by the laser and converts it into heat e.g. carbon black.
  • the support of the dye-donor element may be an electrically resistive ribbon consisting of e.g. a multilayer structure of a carbon-loaded polycarbonate coated with a thin aluminium film.
  • Current is injected into the resistive ribbon by electrically addressing a printing head electrode resulting in highly localized heating of the ribbon beneath the relevant electrode.
  • the fact that in this case the heat is generated directly in the resistive ribbon and that it is thus the ribbon that gets hot leads to an inherent advantage in printing speed using the resistive ribbon/electrode head technology as compared to the thermal head technology, according to which the various elements of the thermal head get hot and must cool down before the head can move to the next printing position.
  • Receiver sheets were prepared by coating a polyethylene terephthalate film support having a thickness of 175 ⁇ m with a dye-image-receiving layer from a solution in ethyl methyl ketone of 3,6 g/m of poly(vinyl chloride/co-vinyl acetate/co-vinyl alcohol) (VinyliteTM VAGD supplied by Union Carbide), 0,336 g/m of diisocyanate (DesmodurTM VL supplied by Bayer AG), and 0,2 g/m of hydroxy-modified polydimethylsiloxane (TegomerTM H SI 2111 supplied by Goldschmidt).
  • VinyliteTM VAGD poly(vinyl chloride/co-vinyl acetate/co-vinyl alcohol)
  • DesmodurTM VL supplied by Bayer AG
  • TegomerTM H SI 2111 supplied by Goldschmidt
  • Dye-donor elements for use according to thermal dye sublimation transfer were prepared as follows:
  • a solution comprising an amount of light-stabilizer as indicated in the following Table 2, 0.5 % by weight of dye as indicated in Table 2, and 0.5 % by weight of copolystyrene-acrylonitrile (LuranTM 388S, supplied by BASF, Germany) as binder in ethyl methyl ketone was prepared.
  • the opposite side of the film support was coated with a subbing layer of a copolyester comprising ethylene glycol, adipic acid, neopentyl glycol, terephthalic acid, isophthalic acid, and glycerol.
  • a copolyester comprising ethylene glycol, adipic acid, neopentyl glycol, terephthalic acid, isophthalic acid, and glycerol.
  • the dye-donor element was printed in combination with a receiver sheet in a Mitsubishi colour video printer CP100E.
  • the receiver sheet was separated from the dye-donor element and the colour density value of the recorded image was measured by means of a Macbeth TR 924 densitometer in the red, green, and blue region in Status A mode.
  • each receiver sheet was subjected to irradiation by means of a xenon lamp of 150 klx for a time indicated in hours in Table 2 and the colour density values were measured again. The density change was calculated and is listed in percent in Table 2.
  • Dye-donor elements were prepared as described in Example 1, with the proviso that dyes, light-stabilizers according to the present invention, a prior art light-stabilizer described in EP 312,812 (taken for comparison purposes), and amounts, all as indicated in Table 4 hereinafter, were used.
  • the prior art light-stabilizer COMP corresponds to the following structural formula :
  • Type CK 100 S Commercially available elements supplied by Mitsubishi, Type CK 100 S were used as receiver sheets for tests 1 to 14. Receiver sheets as described in Example 1 hereinbefore were used for tests 15 to 17.
  • Table 4 Test N° Dye N° Light-stabilizer Density change in % after xenon exposure for N° % by wt. used 4 h 12 h 1 D01 none - 2 -47 2 D01 S.08 0.2 - 3 -21 3 D01 COMP. 0.2 - 1 -17 4 D01 S.08 0.5 0 - 8 5 D01 COMP. 0.5 0 - 9 6 D02 none - 9 -69 7 D02 S.08 0.2 - 2 -40 8 D02 COMP. 0.2 - 3 -31 9 D02 S.08 0.5 + 3 -18 10 D02 COMP. 0.5 - 5 -19 11 D08 none - 3 - 5 12 D08 COMP.

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Claims (11)

  1. Farbstoffdonatorelement für den Einsatz bei der Farbstoffübertragung durch Thermosublimation, das aus einem Träger mit einer darauf aufgebrachten Farbstoffschicht, die wenigstens einen Farbstoff und ein Bindemittel enthält, besteht, dadurch gekennzeichnet, daß diese Farbstoffschicht oder eine darauf aufgebrachte Deckschicht ebenfalls einen Lichtstabilisator für diesen wenigstens einen Farbstoff enthält, wobei es sich bei diesem Lichtstabilisator um einen Leucoindoanilin-Farbstoff handelt.
  2. Farbstoffdonatorelement nach Anspruch 1, dadurch gekennzeichnet, daß dieser Leucoindoanilin-Farbstoff folgender allgemeiner Formel entspricht :
    Figure imgb0025
     in der bedeuten :
    R1 einen beliebigen Substituenten,
    n 0 oder eine positive ganze Zahl zwischen 1 und 4, und im Falle n 2, 3, oder 4 ist, hat R1 die gleiche Bedeutung oder verschiedene Bedeutungen,
    R2 und R3 (gleich oder verschieden) je ein Wasserstoffatom, -COCOR10, oder eine aus der Reihe von -COR10, -SO2R10 und -OPR10R11 gewählte Acylgruppe,
    X Null oder die Atome, die zur Vervollständigung eines aromatischen, alicyclischen oder heterocyclischen Ringes oder Ringsystems, gegebenenfalls in substituierter Form, notwendig sind,
    R4, R5, R6 und R7 (gleich oder verschieden) je ein Wasserstoffatom, eine Alkylgruppe, eine substituierte Alkylgruppe, eine Cycloalkylgruppe, eine substituierte Cycloalkylgruppe, eine Arylgruppe, eine substituierte Arylgruppe, eine Alkyloxygruppe, eine substituierte Alkyloxygruppe, eine Aryloxygruppe, eine substituierte Aryloxygruppe, eine Carbamoylgruppe, eine substituierte Carbamoylgruppe, eine Sulfamoylgruppe, eine substituierte Sulfamoylgruppe, eine Hydroxylgruppe, ein Halogenatom, -NH-SO2R12, -NH-COR12, -O-SO2R12, oder -O-COR12, oder R4 und R7 zusammen und R5 und R6 zusammen die Atome, die zur Vervollständigung eines aliphatischen Ringes, eines substituierten aliphatischen Ringes, eines heterocyclischen Ringes, eines substituierten heterocyclischen Ringes, eines einen ankondensierten cycloaliphatischen, aromatischen, oder heterocyclischen Ring oder ein solches Ringsystem tragenden heterocyclischen Ringes, oder eines einen ankondensierten cycloaliphatischen, aromatischen, oder heterocyclischen Ring oder ein solches Ringsystem tragenden substituierten heterocyclischen Ringes notwending sind, oder R4 und R8 und/oder R5 und R9 zusammen und R5 und R6 zusammen die zur Vervollständigung eines heterocyclischen Ringes oder eines substituierten heterocyclischen Ringes notwendigen Atome,
    R8 und R9 (gleich oder verschieden) je ein Wasserstoffatom, eine Alkylgruppe, eine substituierte Alkylgruppe, eine Cycloalkylgruppe, eine substituierte Cycloalkylgruppe, eine Arylgruppe, eine substituierte Arylgruppe, einen heterocyclischen Ring, einen substituierten heterocyclischen Ring, oder R8 und R9 zusammen die zur Vervollständigung eines heterocyclischen Ringes oder eines substituierten heterocyclischen Ringes notwendigen Atome,
    R10, R11 und R12 (gleich oder verschieden) je eine Alkylgruppe, eine substituierte Alkylgruppe, eine Cycloalkylgruppe, eine substituierte Cycloalkylgruppe, eine Alkenylgruppe, eine substituierte Alkenylgruppe, eine Arylgruppe, eine substituierte Arylgruppe, eine Alkyloxygruppe, eine substituierte Alkyloxygruppe, eine Aryloxygruppe, eine substituierte Aryloxygruppe, eine Alkylthiogruppe, eine substituierte Alkylthiogruppe, eine Arylthiogruppe, eine substituierte Arylthiogruppe, eine Aminogruppe, eine substituierte Aminogruppe, einen heterocyclischen Ring oder einen substituierten heterocyclischen Ring.
  3. Farbstoffdonatorelement nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß dieser Lichtstabilisator in Mengen von 20 bis 150 Gew.-%, bezogen auf das Gewicht dieses Farbstoffs, eingesetzt wird.
  4. Gefärbter Empfangsbogen, der wenigstens einen Farbstoff und wenigstens einen Lichtstabilisator für diesen Farbstoff umfaßt, dadurch gekennzeichnet, daß dieser Farbstoff und dieser Lichtstabilisator in einer durch Farbstoffübertragung durch Thermosublimation aus einem Farbstoffdonatorelement erzeugten bildgemäßen Verteilung vorliegen, und es sich bei diesem Lichtstabilisator um einen Leucoindoanilin-Farbstoff handelt.
  5. Gefärbter Empfangsbogen nach Anspruch 4, dadurch gekennzeichnet, daß dieser Leucoindoanilin-Farbstoff der allgemeinen Formel nach Anspruch 2 entspricht.
  6. Empfangsbogen für den Empfang einer bildgemäßen Farbstoffverteilung durch Farbstoffübertragung durch Thermosublimation aus einem Farbstoffdonatorelement, dadurch gekennzeichnet, daß dieser Empfangsbogen einen Lichtstabilisator für diesen Farbstoff enthält, wobei es sich bei diesem Lichtstabilisator um einen Leucoindoanilin-Farbstoff handelt.
  7. Empfangsbogen nach Anspruch 6, dadurch gekennzeichnet, daß dieser Leucoindoanilin-Farbstoff der allgemeinen Formel nach Anspruch 2 entspricht.
  8. Empfangsbogen nach Anspruch 6, dadurch gekennzeichnet, daß dieser Lichtstabilisator in einer ein Bindemittel enthaltenden Farbstoffbildempfangsschicht enthalten ist.
  9. Empfangsbogen nach Anspruch 8, dadurch gekennzeichnet, daß dieser Lichtstabilisator in einer Menge von 10 bis 100 Gew.-%, bezogen auf das Gewicht dieses Bindemittels, enthalten ist.
  10. Verfahren zur Erzeugung eines lichtechten Farbstoffbildes nach der Farbstoffübertragung durch Thermosublimation durch die bildgemäße Erwärmung eines Farbstoffdonatorelements nach Anspruch 1 und die Übertragung des bildgemäß erwärmten Farbstoffs und Lichtstabilisators auf einen Empfangsbogen.
  11. Verfahren zur Erzeugung eines lichtechten Farbstoffbildes nach der Farbstoffübertragung durch Thermosublimation durch die bildgemäße Erwärmung eines Farbstoffdonatorelements, das eine Farbstoffschicht umfaßt, die ein Bindemittel und wenigstens einen Farbstoff enthält, und die Übertragung des bildgemäß erwärmten Farbstoffs auf einen Empfangsbogen nach Anspruch 6.
EP19940201166 1993-05-12 1994-04-26 Lichtstabilisatoren für Farbstoffe für das Farbstoffsübertragungsaufzeichnungsverfahren Expired - Lifetime EP0624482B1 (de)

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EP0624482B1 true EP0624482B1 (de) 1997-07-16

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EP0464268B1 (de) * 1990-07-03 1993-09-22 Agfa-Gevaert N.V. Thermischer Übertragungsdruck mit UV-absorbierender Verbindung
DE69120653T2 (de) * 1991-02-04 1997-02-27 Agfa Gevaert Nv Methode zum Stabilisieren eines Materials zur Verwendung in einem thermischen Bilderzeugungsverfahren durch Farbstoffübertragung
EP0507734A1 (de) * 1991-04-04 1992-10-07 Ciba-Geigy Ag Empfangselement für den Thermotransferdruck

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