EP0513757B1 - Méthode pour l'impression par transfert thermique et matériaux pour l'impression - Google Patents

Méthode pour l'impression par transfert thermique et matériaux pour l'impression Download PDF

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Publication number
EP0513757B1
EP0513757B1 EP19920108070 EP92108070A EP0513757B1 EP 0513757 B1 EP0513757 B1 EP 0513757B1 EP 19920108070 EP19920108070 EP 19920108070 EP 92108070 A EP92108070 A EP 92108070A EP 0513757 B1 EP0513757 B1 EP 0513757B1
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EP
European Patent Office
Prior art keywords
layer
resin
colouring
dyeing layer
dyeing
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.)
Expired - Lifetime
Application number
EP19920108070
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German (de)
English (en)
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EP0513757A1 (fr
Inventor
Nobuyoshi Taguchi
Akihiro Imai
Soichiro Mima
Yasuo Fukui
Hiroyuki Matsuo
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.)
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Publication of EP0513757A1 publication Critical patent/EP0513757A1/fr
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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
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
    • B41M5/395—Macromolecular additives, e.g. binders

Definitions

  • the present invention relates to a thermal transfer printing method according to the preamble of claim 1.
  • the method is capable of printing high quality images on a plain paper sheet.
  • the arrangement is such that a transfer member having a coloring material layer containing a sublimining dye provided on a thin film base and an image-receptor or image receiver provided with a dyeing layer on a thick film such as a synthetic paper or the like are overlapped with each other, and by transferring the subliming dye into the dyeing layer through employment of a thermal recording head, a color mixed image of dye molecules is recorded or printed.
  • the printing is generally effected by driving the image-receptor and by causing a transfer member to follow the movement through frictional force between the image-receptor and the transfer member.
  • the image-receptor has a double-sheet structure, and an adhesive material is applied onto a reverse surface of a base material formed with an upper dyeing layer so as to be fixed on a support member provided with a lower parting layer, whereby after printing, the upper layer is separated or peeled off for being fixed on a post-card, etc.
  • the printed image by the dye thermal transfer printing method is formed on the specially prepared paper sheet. Therefore, running costs tend to be high, and printing speed is relatively low, thus preventing said printing technique from spreading widely for general applications.
  • Document EP-0 395 014-A1 comprises a thermal transfer material including a support and a heat-transferable ink layer disposed thereon, wherein the heat-transferable ink layer has a storage elasticity modulus E' satisfying the relationship 1 x 10 7 ⁇ E' ⁇ 1 x 10 8 N/m 2 at 30 °C.
  • Another object of the present invention is to provide a thermal transfer printing method which may be readily adopted in actual applications in an efficient manner and at low costs.
  • the dyeing layer may be heat transferred partially or totally onto the base material by a thermal recording means such as a thermal head or a hot roller or the like.
  • the dyeing layer may be formed partially or totally on the base material by means of printing or the like.
  • "recording member” means any base material provided with the dyeing layer that has to be thermally transferred along with the colouring material.
  • the colouring material (such as a dye and/or a molten ink) of the colouring layer on the transfer member is thermally transferred onto the dyeing layer of the recording member.
  • the colouring layer comprises both the dye layer and the molten ink layer, it is preferred that the molten ink layer is transferred first, with the dye layer being transferred thereafter.
  • the base material is mostly a pulp paper.
  • the recording member is used as an intermediate member recording after recording the colouring material, only the recorded dyeing layer may be thermally transferred onto the final image-receptor such as pulp paper or the like by means of thermal transferring or thermal setting.
  • pictorical images at high quality which can be obtained only on the expensive special paper may be obtained without selection of the image-receptors, even when the images are mixed with characters.
  • printing less dependent on the quality of paper can be effected onto the bond paper, plain paper, etc.
  • the dyeing layer may be selectively formed or transferred on to the recording member and thus stable colour recording may be effected, and the recorded dyeing layer can be thermally transferred stably onto any image-receptor, without any feeling of disorder as in a coating.
  • the dyeing layer utilized for the present invention is comprised of plastics resin which firstly has a glass transition point of 100 °C or less for transfering a colouring material from the colouring layer to the dyeing layer with ease, secondly has a contacting angle cosine of 0.6 or less measured at 45 x 10 -3 N/m, and thirdly is different from the plastics resin which is used for the colouring layer on the transfer member to improve the peeling properties.
  • the dyeing layer contains at least one selected from the group comprising polyvinylbutyral resin and polystyrene resin. More preferably, a low molecular resin may be mixed with the main resin of the dyeing layer to provide softness and low shearing power thereto. The same effect can be obtained by mixing fine particles therewith. Futher, providing a thermal deformation absorbing layer on the second base material of the recording member renders the recording more stable, and especially in the case of the base material of a thin high molecular film, a thermal deformation on recording can be absorbed, which provides a large effect to registration on colour overlapping recording. Also, by providing the roughness to the surface of the base material, the dyeing layer is easy to be transferred onto the base material.
  • Fig. 1 shows an arrangement for explaining the thermal transfer printing method according to one preferred embodiment of the present invention.
  • a recording member 2 which comprises a dyeing layer 42 formed on a first base material 21 and which is held between a second base material 41 formed on a drum-like configuration metal 4'' and between a thermal head 3-1, whereby thermal transfer and recording of the dyeing layer 42 is effected onto the surface of the second base material 41.
  • any base material that is provided with the dyeing layer 42 at the surface and is in the state just before recorded by a colouring material is reffered to as "recording member ".
  • the base material of the recording member may be formed into a sheet-like shape such as a polyethylene terephthalate film (PET) or the like.
  • PET polyethylene terephthalate film
  • the dyeing layer 42 is subjected to selective transfer only of a portion where the dye is printed later or to the transfer for a predetermined whole area.
  • Reference numeral 2' in Fig. 1 represents the state after the dyeing layer 42 has been transferred.
  • a thermal roller may be used as the thermal head 3-1.
  • the molten ink is subjected to thermal diffusion transfer into the dyeing layer 42 for printing letter or characters.
  • Reference numeral 11 denotes a base material of the molten ink transfer member, while 13 is a lubricant heat-resistant layer.
  • a transfer member 8 having a colouring layer 82 containing a subliming dye and further having a thermal head 3-3 the colouring layer 82 is subjected to thermal transfer and recording onto the recorded dyeing layer 42 for printing full colour images.
  • Reference numeral 81 denotes a base material of the transfer member and 83 is a lubiricant heat-resistant layer
  • the colour image recorded in or on the dyeing layer 42 of the intermediate recording member 4 is thermally transferred onto the image-receptor 5 together with the dyeing layer 42 through employment of a heat roller 7 to be setted thermally.
  • Reference numeral 6 shows the state where the recorded dyeing layer 42 is provided on the image-receptor 5.
  • Fig. 3 shows a further arrangement for explaining the thermal transfer printing method according to another embodiment of the present invention.
  • a recording member 4' which comprises the dyeing layer 42 provided on a thin base material 41 of PET or the like by a printing process or the like.
  • the transfer member 1 which is provided with a molten ink layer 12
  • the thermal head 3-2 the molten ink of the ink layer 12 on the ink transfer member 1 is thermally diffused and transferred into the dyeing layer 42 or on the base material (not provided with any dyeing layer) of the recording member.
  • the portion by the combination of the molten ink transfer member 8 and the thermal head 3-2 is not required.
  • the subliming dye layer 82 on the dye transfer member 8 is thermally transferred and recorded on the dyeing layer portion on the recording portion to print full colouring images.
  • the item recorded on the recording member 4' (the image recorded in or on the dyeing layers 42) onto the image-receptor 5 together with the dyeing layer through employment of a heat roller 7, a high quality image by the dye and molten thermal transfer printing can be obtained without depending on the quality of the material for the image-receptor.
  • Reference numeral 6 shows the state where the recorded dyeing layer 42 is provided on the image-receptor 5.
  • the molten ink is transferred sufficiently thereon. Further, it is preferred to record the molten ink before recording of dye layer, because very samll amount of the lubricant material may be transferred into the dyeing layer.
  • Fig. 2 shows another arrangement for explaining the thermal transfer printing method according to a second embodiment of the present invention.
  • the dyeing layer recording member 2, the molten ink transfer member 1 and the colouring layer transfer member 8 of the Fig. 1 embodiment are formed into one unit as shown in the transfer member 100. More specifically, the thermal transfer of the dyeing layer, the subliming dye and the molten ink is effected by the same thermal head 3-2.
  • the molten ink layer 12-1 and the colouring layer 82 are formed in one colour or in a plurality of colours by the face order subsequent to the dyeing layer portions 42. Since the process after the subliming dye has been recorded on the dyeing layer is the same as in the embodiment of Fig. 1, a detailed description thereof is abbreviated for brevity, with like parts being designated by like reference numerals.
  • the second base material 41 of the recording member 4 is constructed by winding a head-resistant rubber such as a heat-resistant high polymer film, silicone rubber and the like on the surface of the metal drum 4'' or the like.
  • a heat resistant film there are also exemplified films composed of resins capable of forming film such as aromatic polyimide (aramide), polyimide, polycarbonate, PET(polyethylene terephthalate), cellophane, etc.
  • the second base material 41 comprises a heat-resistant film, it is advantageous for registration on overlapping recording that there is provided a heat deformation absorbing layer on said second base material 41.
  • This layer may be comprised of a resin layer with rubber elasticity or a resin layer wity high void content.
  • a resin layer with rubber elasticity SBR (styrenebutadiene rubber) or the one represented by latex thereof are useful.
  • an acrylonitrilebutadiene or the like is useful for the purpose.
  • Additives such as fine particles or the like may be added to the layers.
  • the base material for the recording member comprising a high polymer or high molecular film
  • provision of a rough surface make the dyeing layer easy to be transferred.
  • the rough surface may be formed by addition of particles thereto or by the rubbing paper of roughness No.1000.
  • the dyeing layer recording member 2 shown in Fig.1 includes a base material 21 and a dyeing layer 42 on said base material 21.
  • a base material 21 and a dyeing layer 42 on said base material 21.
  • Fig.4 shows a plot of estimated surface energy of four kinds of resins and PET film.
  • the axis of abscissae indicates a surface tension of test resin and the axis of ordinates indicates a cosine of the contact angles.
  • the cosine of the contact angle in the present invention is defined by the value measured at 45 N/m (45 dyn/cm) or more.
  • Fig.4 shows that the cosine values of polyvinylbutyral(PVB) and polystylene(PSt) resins are below 0.6 while those of sarturated polyester(PEs) and AS resin are above 0.6 as similar to that of PET film. Therefore, the PVB and PSt resin are useful for the present invention.
  • the glass transition temperature Tg of the dyeing resin should preferably be as low as possible so long as no problem is brought about in the recording or printing.
  • vinylchroride-vinylacetate copolymer resin saturated polyester resin, polyacetal resin such as polyvinylbutyral, acrylic resin, urethane resin, polyamide resin and the like may be used.
  • the dyeing layer has a lower grass-transition temperature Tg of 100 °C or less.
  • the resin used for the dyeing layer different from the main resin used for the colouring layer. THereby, the melting adhesion between the colouring layer and the dyeing layer can be prevented on recording.
  • the glass transition temperature Tg As the system of the dyeing layer and controlling the surface frictional characteristics thereof, it is effective to mixed the above high molecular resin with a low molecular resin.
  • a low molecular resin a general hot melt resin may be used, especially a low molecular polystyrene resin is preferred.
  • the other examples are a low molecular polyethylene, a petroleum resin, a rosin resin, a terpene resin, a cumarone resin, an alicyclic saturated hydrocarbon resin, a ester gum, and high molecular waxes for the purpose.
  • acrylsilicone resin having siloxane methacrylate at the terminal or side chain is effective.
  • the acrylsilicone resin may be modified to have a silane coupling agent comprising an alkoxysilyl group or the like at the terminal chain and acted with trace moisture in the atmosphere to give a resin provided with a siloxane bonding (siloxane-contained, moisture-hardening type resin), which is useful.
  • An acryl (silicone) resin having fluorine methacrylate at the terminal or side chain is also effective. If necessary, these resins may be used with a reaction accelerator.
  • silicone group lubricants for the releasing agent or material to be added to resin, there are available various silicone group lubricants, fluorine group surface-active agent, waxes such as paraffine, and polyethylene, etc., higher fatty group alcohol, higher fatty acid amide and ester, etc.
  • liquid state lubricants dimethyl polysiloxane, methylphenylpolysiloxane, fluorosilicone oil, various denatured silicone oil, reactants of more than two kinds of reactive silicone oils (e.g. reactants of the epoxy modified and the carboxyl or amino modified, etc.) are employed.
  • reaction type of resin and lubricant may be employed, and for example, water soluble polysiloxane graft acrylic resin prepared by subjecting polysiloxane to graft polymerization with acrylic resin, acrylic silicons (silicone) resin added with siloxane methacrylate at the terminal or chain side or acrylurethane silicone (silicon) resin, etc. are effective.
  • fine particles may be added to the dyeing layer.
  • inorganic fine particles such as silica, titanium white, barium sulfate, zinc oxide, etc. which protrude from the surface of the dyeing layer are very effective for the selective transfer of the dyeing layer and the transfer of the recorded dyeing layer to the image-receptor.
  • the colouring layer transfer member 8 includes a base material 81, a heat-resistant lubricity layer 83 formed on the reverse face of the base material 81, and colouring layer 82 provided on the upper face thereof.
  • the base material 81 is made of a high polymer film of 2 to 20 microns in thickness.
  • the PET (polyethylene terephthalate) film is generally employed, but films composed of resins capable of forming films such as aromatic polyimide (aramide), polyimide, polycarbonate, polyphenylene sulfide, polyether ketone, triacetyl cellulose, and cellophane, etc. are also useful for the purpose.
  • the colouring layer 82 is composed of at least a subliming dye and a bonding agent.
  • the subliming dye the dispersing dye, oil soluble dye, basic dye, color former, etc. are used. Particularly, dispersing dyes of indoaniline group, guinophthalone group, dicyano imidazole group, dicyano methine group, tricyanovinyl group, etc. are useful.
  • the bonding agent polyester, polyvinyl butyral, acrylstyrene resin, etc. are employed. If necessary, a lubricant agent and fine particles may be used.
  • the heat resistant lubricity layer 13 is provided to impart a lubricating characteristic between the thermal head 3 and the base material 81 and is formed into the film by the ultra-violet curing resin, liquid state lubricant, inorganic fine particles or the like.
  • the image-receptor or image receiving material 5 may be of the pulp group paper such as the bond paper, plain paper, etc. or it may be of the synthetic paper such as a semi-translucent PET film YUPO, etc. or of a base material prepared by bonding pulp paper with a film.
  • the recording heads 3-1,3-2 and 3-3 normal thermal heads, energizing heads, laser heads, etc. are employed.
  • the recording conditions when the line type thermal head is employed are as follows. Line recording period T: 33ms to 4ms, impression pulse width: 16ms to 2ms, and recording energy E: 8 to 4 J/cm 2 .
  • the thermal transfer of the recorded dyeing layer onto the image-receptor 5 is effected under such conditions as temperature: about 180°C, speed: 10mm/sec., and pressure 4kg/1cm when the heat roll 7 is employed.
  • a dye layer was formed with ink as described below by a gravure coater so as to be 1 micron in a solid state thickness.
  • ink Indoaniline group disperse dye 2.5 weight parts Acrylstyrene resin 4 weight parts Amide denatured silicone oil 0.02 weight part Toluene 20 weight parts 2-butanone 20 weight parts
  • black molten ink 82 having the compositions as follows was applied to form a film having a thickness of 2 microns in the dried state.
  • a base material is the same as that of the dye layer transfermember. On the base material, a dyeing layer as follows was formed.
  • BL-S polyvinylbutyral resin
  • a low molecular polystyrene Piccolastic A75 from Hercules Inc.
  • the images obtained on the bond paper in the manner as described above were a high quality pictorial image with maximum reflection density of more than 1.8 and black letters with such density of more than 1.5.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (21)

  1. Procédé d'impression par transfert thermique qui utilise
    un élément d'enregistrement (4') comportant une couche de colorant (32) formée partiellement ou entièrement sur un matériau de base (41) au moyen d'un processus d'impression ou d'un processus de transfert thermique,
    un élément de transfert 8 comportant une couche colorante (82), et un récepteur d'image (5),
    d'où il résulte qu'un matériau colorant de la couche colorante (82) est transféré thermiquement sur la couche de colorant (42), la couche de colorant enregistrée (42) étant ensuite transférée sur le récepteur d'image (5),
    caractérisé en ce que
    la couche de colorant (42) est constituée d'une matière plastique résineuse présentant
    une température de transition vitreuse de 100° C ou moins destinée à faciliter le transfert du matériau colorant de la couche colorante (82) sur la couche de colorant (42),
    un angle de contact cos égal à 0,6 ou moins mesuré à 45x 10-3 M/m (dyn/cm), et
    différant de la matière plastique résineuse qui est utilisée pour la couche colorante (82) sur l'élément de transfert 8 en vue d'améliorer les propriétés d'arrachage.
  2. Procédé selon la revendication 1, caractérisé en ce que la couche de colorant (42) est thermiquement déposée sur un premier matériau de base (21) pour être partiellement ou entièrement transférée sur ledit matériau de base (41) comme second matériau de base, le matériau colorant de la couche colorante (82) étant transféré thermiquement sur la couche de colorant (42).
  3. Procédé selon la revendication 2, caractérisé par l'emploi d'un élément d' enregistrement 2 comportant une couche de colorant (42) formée partiellement ou entièrement sur le premier matériau de base (21) par un processus d'impression, au moins un second élément de transfert (8) comportant une couche colorante (82), dans lequel la couche de colorant (42) sur le premier matériau de base (21) est partiellement ou entièrement transférée thermiquement sur le second matériau de base (41), puis le matériau colorant de la couche colorante (82) est transférée thermiquement sur la couche de colorant (42) sur le second matériau de base( 41) et, enfin, l'image enregistrée dans la couche de colorant est transférée sur le récepteur d'image (5).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la couche de colorant (42) est formée à travers une couche de séparation déposée partiellement ou entièrement sur la première plaque de base.
  5. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second matériau de base (41) comprend un film de polymère dont la surface est revêtue d'une couche d'absorption présentant une déformation thermique et une élasticité caoutchouteuse.
  6. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le second matériau de base (41) comprend un film de polymère présentant une surface rugueuse.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche de colorant (42) est seulement constituée d'une résine polymère et en ce que la couche colorante (82) est revêtue d'un matériau lubrifiant.
  8. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche de colorant (42) comprend au moins une résine à poids moléculaire élevé et une résine à faible poids moléculaire.
  9. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche de colorant (42) comprend au moins une résine à poids moléculaire élevé, une résine à faible poids moléculaire et de fines particules.
  10. Procédé selon les revendications 8 ou 9, caractérisé en ce que la couche de colorant (42) contient un matériau lubrifiant.
  11. Procédé selon l'une quelconque des revendications 1 à 10, caractérisé en ce que l'élément de transfert (8) est une couche colorante (82) comportant une couche de colorant (42) et en ce qu'une couche d'encre à l'état de fusion est formée sur la même ou sur des couches séparées.
  12. Procédé selon la revendication 11, caractérisé en ce que la couche colorante (82) de l'élément de transfert (8) est enregistré après que la couche d'encre (12) de l'élément de transfert (8) ait été enregistrée.
  13. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche de colorant (42) contient une résine de polybutyryl de vinyle et/ou une résine de polystyrène.
  14. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche de colorant (42) contient une résine de polybutyryl de vinyle et une résine de polystyrène à faible poids moléculaire. ainsi qu'une résine de polyester.
  15. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche de colorant (42) contient une résine de polybutyryl de vinyle, une résine de polystyrène à faible poids moléculaire et une résine de polyester.
  16. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche de colorant (42) contient une résine de polyester et une résine de polystyrène à poids moléculaire faible ou élevé.
  17. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche colorante (82) contient au moins un colorant, une résine adhésive principale et une résine de polystyrène à faible poids moléculaire.
  18. Procédé selon la revendication 17, caractérisé en ce que la couche colorante (82) contient, en outre, un matériau lubrifiant.
  19. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche colorante (82) contient au moins un colorant, une résine d' acrylonitrilestyrène ou une résine de polyester et un matériau lubrifiant.
  20. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que le matériau lubrifiant présent dans la couche colorante (82) ou dans la couche de colorant est une résine acrylique contenant du méthacrylate de siloxane ou du méthacrylate fluoré au niveau de la chaíne terminale ou latérale.
  21. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que la couche colorante (82) et la couche de colorant (42) sont formées sur le même matériau de base (11).
EP19920108070 1991-05-13 1992-05-13 Méthode pour l'impression par transfert thermique et matériaux pour l'impression Expired - Lifetime EP0513757B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP10718291 1991-05-13
JP107182/91 1991-05-13

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EP0513757A1 EP0513757A1 (fr) 1992-11-19
EP0513757B1 true EP0513757B1 (fr) 1998-09-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1129862B1 (fr) 1998-10-08 2006-06-14 Matsushita Electric Industrial Co., Ltd. Couche receptrice et recepteur d'images pour impression par transfert thermique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650494A (en) * 1983-11-08 1987-03-17 Dai Nippon Insatsu Kabushiki Kaisha Heat transfer printing sheet
DE69004132T2 (de) * 1989-03-28 1994-03-24 Dainippon Printing Co Ltd Wärmeempfindliche Übertragungsschicht.
US5268052A (en) * 1989-04-27 1993-12-07 Canon Kabushiki Kaisha Thermal transfer material and thermal transfer recording method

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DE69226806D1 (de) 1998-10-08
EP0513757A1 (fr) 1992-11-19
DE69226806T2 (de) 1999-01-21

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