EP0955181B1 - Ruban pour le transfert thermique avec une couche de décollage - Google Patents

Ruban pour le transfert thermique avec une couche de décollage Download PDF

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Publication number
EP0955181B1
EP0955181B1 EP99106170A EP99106170A EP0955181B1 EP 0955181 B1 EP0955181 B1 EP 0955181B1 EP 99106170 A EP99106170 A EP 99106170A EP 99106170 A EP99106170 A EP 99106170A EP 0955181 B1 EP0955181 B1 EP 0955181B1
Authority
EP
European Patent Office
Prior art keywords
thermal transfer
wax
layer
weight
transfer ribbon
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
EP99106170A
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German (de)
English (en)
Other versions
EP0955181A1 (fr
Inventor
Heinrich Krauter
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.)
Pelikan Produktions AG
Original Assignee
Pelikan Produktions AG
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 Pelikan Produktions AG filed Critical Pelikan Produktions AG
Publication of EP0955181A1 publication Critical patent/EP0955181A1/fr
Application granted granted Critical
Publication of EP0955181B1 publication Critical patent/EP0955181B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
    • B41M5/38214—Structural details, e.g. multilayer systems
    • 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
    • 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
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/913—Material designed to be responsive to temperature, light, moisture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/914—Transfer or decalcomania

Definitions

  • the invention relates to a thermal transfer ribbon with a conventional carrier, with a wax-bonded layer of a thermal transfer ink formed on one side of the carrier and with a wax- bonded release layer located between the carrier and the wax-bonded layer, the wax-bonded layer B) of the thermal transfer ink containing a wax-soluble polymer.
  • thermal transfer ribbons are known from the prior art. So describes DE 195 48 401 A1 a thermal transfer ribbon with a conventional carrier, a plastic-bonded layer formed on one side of the carrier Thermal transfer ink and a separating layer between the support and the layer of thermal transfer ink, the interface is wax-bound and the waxes are one Melting point of about 70 to 110 ° C and a polymeric wax plasticizer with contains a glass transition temperature Tg of -30 to + 70 ° C and the plastic-bound Thermal transfer ink contains a wax-compatible polymer. It is similar Thermal transfer ribbon of DE 196 12 393 A1 constructed, the separation layer is wax-bonded, but the layer of thermal transfer ink is at least about 20 % By weight natural resin, modified natural resin and / or synthetic resin.
  • EP-A-0 826 512 relates to a thermal transfer ribbon comprising a support and a thermofusible ink layer, between which a Intermediate adhesive layer is provided, the 20 to 80 wt .-% of a polyester resin with a glass transition temperature of not more than 20 ° C and 20 to 80% by weight has at least one pigment and carbon black.
  • JP-A-07089253 describes a thermal transfer sheet composed of a carrier, a removable layer and a thermofusible ink layer.
  • the removable Layer is a mixture of wax and styrene-butadiene rubber as main components, wherein the waxes used have a melting point of 60 to 90 ° C and the rubber has a glass transition temperature of -30 to + 20 ° C.
  • the Thermal transfer ink layer contains a wax component as a binder, a dye and optionally resins such as acrylic resin, styrene-acrylic resin or other additives.
  • a thermal transfer ribbon of the type described above goes from DE 195 48 033 A1 forth.
  • the wax-bound separating layer described therein serves the better Separation of the wax-bound layer of the thermal transfer ink from the respective one Carrier.
  • a particular goal of this well-known teaching is the need for training a so-called "top coat" (adhesive layer) or a two-layer thermal transfer ink exclude and satisfactory mat during thermal printing Get printouts. This is ensured by the fact that both the wax-bound Separating layer as well as the wax-bound layer of the thermal transfer ink contain a wax-soluble polymer in a sufficiently large amount.
  • Prefers contains the wax-bound layer of thermal transfer ink about 2 to 20 wt .-% wax-soluble polymer and the separating layer 10 to 60 wt .-%.
  • thermal transfer ribbon described above is highly suitable, the one addressed Satisfying objectives. However, it is too with other objectives improve.
  • the so-called "inline packaging" printing process plays an increasing role, with printing speeds of 300 to 600 mms -1 being used.
  • the thermal transfer ribbons used must meet various requirements: They should be usable on normal and high-speed printers with conventional print heads. At the same time, the thermal transfer ribbon should also show good print quality at printing speeds of up to 600 mms -1 . In the case of products known in the prior art which meet the aforementioned requirements, however, it is still problematic to achieve good scratch resistance on films and paper. The desired solvent resistance of these tapes is also insufficient. So far there is no product on the market that meets these requirements.
  • the invention was therefore based on the object of a thermal transfer ribbon at the outset to propose the type described, with which the above-mentioned objectives for improvement the print quality as well as the scratch and solvent resistance.
  • the thermal transfer ribbon should be used in many ways and for normal and high-speed printers be equally suitable with conventional printheads.
  • the wax-bound separating layer A) contains less than 20% by weight but more than 0% by weight , in particular 3 to 8% by weight, of wax-insoluble polymer, the wax-insoluble polymer having wax-plasticizing properties and a Glass temperature Tg from -30 ° to + 70 ° C.
  • a separation layer or release layer is understood here to mean a layer that during the printing process, the transfer of the thermal transfer ink onto the receiving substrate controls and is itself partially transferred to the substrate.
  • Both in the separation layer A) and the layer B) of the thermal transfer ink are wax-bound layers.
  • a central feature of the thermal transfer ribbon of the invention is that is contained in the layer B) of the thermal transfer ink, a wax-soluble polymer which is an ethylene-vinyl acetate copolymer is present in a particularly preferred embodiment in shape.
  • a wax-soluble polymer which is an ethylene-vinyl acetate copolymer is present in a particularly preferred embodiment in shape.
  • “Wax-soluble” is understood here to mean that this polymer shows solubility in a liquid wax.
  • the wax-soluble ethylene-vinyl acetate copolymer has a softening point in the range from 50 ° to 65 ° C., in particular from 60 ° C.
  • the ethylene-vinyl acetate copolymer preferably has a vinyl acetate content of 30 to 40% by weight.
  • Layer B preferably contains the ethylene-vinyl acetate copolymer in an amount of 10 to 40% by weight, in particular 12 to 20% by weight. If the value falls below 10% by weight, the scratch resistance on the packaging material is no longer guaranteed. A value of more than 40% by weight leads to insufficient resolution of the printed characters.
  • the waxes used in the separating layer A) and layer B) in accordance with the invention correspond to the customary wax definition, "narrowly cut" waxes being preferred, ie the melting and solidification point of the waxes must lie closely together.
  • waxes with a melting point of 75 to 90 ° C. are used.
  • it is a material that is solid to brittle, hard, coarse to fine crystalline, translucent to opaque, but not glassy, melts above approx. 70 ° C, but is relatively low-viscosity and not stringy just above the melting point.
  • Waxes of this type can be assigned to natural waxes, chemically modified waxes and synthetic waxes.
  • waxes in the form of carnauba wax, candelilla wax, mineral waxes in the form of higher-melting ceresin and higher-melting ozokerite (earth wax), petrochemical waxes, such as, for example, petrolatum, paraffin waxes and microwaxes, are particularly preferred.
  • petrochemical waxes such as, for example, petrolatum, paraffin waxes and microwaxes
  • montan ester waxes montan ester waxes, hydrogenated castor oil and hydrogenated jojoba oil
  • synthetic waxes polyalkylene waxes and polyethylene glycol waxes and products made therefrom by oxidation and / or esterification are preferred.
  • Amide waxes can also be used. Specifically, the following are particularly preferred: modified microcrystalline waxes.
  • a variety of additives can be incorporated into the wax materials of the wax-bonded thermal transfer ink, such as, in particular, tackifiers in the form of terpene phenol resins (such as the commercial products Zonatac lite 85 from Arizona Chemical) and hydrocarbon resins (such as the commercial products KW-Harz 61 B1 / 105 from VFT , Frankfurt).
  • An adhesive layer with tackifier can be applied to layer B).
  • the coloring can be done by any colorant. It can be pigments, in particular carbon black, but also solvent and / or binder-soluble colorants, such as the commercial product Basoprint, organic color pigments and various azo dyes (Cerces and Sudan dyes). Carbon black is particularly suitable in the context of the present invention.
  • the thermal transfer ink preferably contains the colorant, in particular pigment, in an amount of 15 to 40% by weight.
  • the melting point of the wax-bound thermal transfer ink is preferably between 60 and 70 ° C.
  • ethylene-vinyl acetate copolymer of about 30 wt .-% and one Soot content of about 20% by weight in layer B) can impair processing lead to high viscosity.
  • the separation layer A) and / is preferred or layer B) is then coated with a solvent.
  • a solvent a mixture of isopropanol and toluene, preferably in the ratio 2: 1 is used.
  • the application thickness of the separating layer A) and the layer B) is not critical.
  • the separating layer A) preferably has an application thickness of 0.5 to 5 g / m 2 , in particular 1.5 to 3 g / m 2
  • the layer B) an application thickness of 1.0 to 5 g / m 2 , in particular of 1.5 to 2.5 g / m 2 .
  • the carrier of the ribbon according to the invention is not critical.
  • Polyethylene terephthalate (PET) or capacitor papers are preferably used as the base film for thermal transfer ribbons.
  • the selection parameters are the highest possible tensile elongation values and thermal stability with low film thicknesses.
  • the PET films are available down to about 2.5 ⁇ m , capacitor paper down to about 6 ⁇ m .
  • the thermal print head reaches temperatures of up to 400 ° C, ie temperatures that are above the softening point of PET.
  • the coating material preferably consists of paraffin, silicone, natural waxes, in particular carnauba wax, beeswax, ozokerite and paraffin wax, synthetic waxes, in particular acid waxes, ester waxes, partially saponified ester waxes and polyethylene waxes, glycols or polyglycol, antistatic agents and / or surfactants. If such a rear coating is provided, then there is an undisturbed heat transfer from the thermal print head to the thermal transfer ribbon, with the result that particularly sharp prints are achieved.
  • This thin layer is preferably coated with one of the solvents listed above.
  • the thermal transfer ribbon according to the invention described above can be varied Make way using standard application methods. For example by spraying or printing on a solution or dispersion, either with Water or an organic solvent as a dispersion or solvent, by application from the melt, which is particularly important for the wax-bound thermal transfer ink applies, or by normal application using a doctor blade in the form an aqueous suspension with finely divided material to be applied.
  • an aqueous suspension of the starting materials of the separating layer is applied to the support in a thin layer, which gives rise to the separating layer A) when the water is evaporated.
  • the application of an aqueous suspension of the starting material of the wax-bound thermal transfer dye follows, the water being evaporated off in the usual manner after the application of this material.
  • the double-layer covering formed fulfills all the requirements that lie within the scope of the task.
  • the thermal transfer ink can also be applied to the separating layer in the form of a melt using customary application technologies, for example using a doctor blade.
  • the temperature of the respective melt should generally be 100 to 130 ° C. After application, the applied materials are only allowed to cool.
  • the wax-soluble polymer present exclusively in layer B) which, according to a particularly preferred embodiment, is an ethylene-vinyl acetate copolymer with a softening point in the range from 50 to 65 ° C. and in particular with a vinyl acetate content of about 30 wt .-% is, causes a high mechanical anchoring of the thermal transfer ink on the receiving material, thereby resulting in excellent print quality.
  • the wax-bound separating layer A which is also transferred up to 80% during the printing process, leads to an unexpectedly high scratch resistance and additional resistance to solvents.
  • the layer B has a high has mechanical anchoring on the receiving paper and at the same time up to 80% of the separation layer A is also transferred. Only in this way can the combination of the properties described above can be achieved.
  • the above material is applied in a solvent dispersion (10%, in toluene / isopropanol 80:20) in a dry thickness of 1.0 to 2.0 ⁇ m .
  • the solvent is evaporated by passing hot air at a temperature of 100 ° C.
  • the thermal transfer ink B) is then shaped using the following recipe a solvent dispersion (15% in toluene / isopropanol 30:70) with a reverse roll pressure upset.
  • Example 1 was repeated with the modification that the following recipes were used for the separation layer A) and the color layer B): Interface A): Ester wax (melting point 80-85 ° C) 72 parts by weight Paraffin HNP 20 parts by weight Polyester resin ( Dynapol® Hüls AG, D-Tg: 28 ° C) 8 parts by weight 100 parts by weight Transfer color layer B): Paraffin wax 40 parts by weight Petrolite WB 17® 12 parts by weight Zonatac lite 85 7 parts by weight EVA 33-400 14 parts by weight filler 7 parts by weight Soot 20 parts by weight 100 parts by weight
  • the two thermal transfer ribbons produced in Examples 1 and 2 were tested on high-speed printers and so-called "inline packaging" printers with printing speeds of 300 and 600 mms -1 and the printing results were evaluated. In both cases, the print quality was very good with excellent scratch and solvent resistance.

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

Claims (12)

  1. Ruban de transfert thermique comprenant un support classique, une couche d'une encre de transfert thermique liée par une cire, formée d'un côté du support, et une couche de séparation liée par une cire, se trouvant entre le support et la couche liée par la cire, la couche B) d'encre de transfert thermique liée par une cire contenant un polymère soluble dans la cire, caractérisé en ce que la couche A) de séparation liée par une cire contient moins de 20 % en poids, mais plus de 0 % en poids, en particulier 3 à 8 % en poids de polymère insoluble dans la cire, le polymère insoluble dans la cire possédant des propriétés plastifiantes pour la cire et présentant une température Tg de transition vitreuse de - 30 à + 70°C.
  2. Ruban de transfert thermique suivant la revendication 1, caractérisé en ce que le polymère soluble dans la cire est un copolymère éthylène - acétate de vinyle ayant une teneur en acétate de vinyle de 30 à 40 % en poids.
  3. Ruban de transfert thermique. suivant la revendication 2, caractérisé en ce que le copolymère éthylène - acétate de vinyle possède un point de ramollissement dans la plage de 50 à 65°C, notamment égal à 60°C.
  4. Ruban de transfert thermique suivant au moins l'une-des revendications précédentes, caractérisé en ce que la couche B) d'encre de transfert thermique liée par une cire contient 10 à 40 % en poids, en particulier 12 à 20 % en poids de copolymère éthylène - acétate de vinyle.
  5. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce que la couche B) d'encre de transfert thermique liée par une cire et/ou la couche de séparation A) sont appliquées à l'aide d'un solvant.
  6. Ruban de transfert thermique suivant la revendication 5, caractérisé en ce que le solvant est l'isopropanol et/ou le toluène.
  7. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce que la couche de séparation A) a une force de revêtement de 0,5 à 5 g/m2, en particulier de 1,5 à 3 g/m2.
  8. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce que la couche B d'encre de transfert thermique présente une force de revêtement de 1 à 5 g/m2, en particulier de 1,5 à 2,5 g/m2.
  9. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce que l'encre de transfert thermique contient une matière colorante, notamment un pigment, en une quantité de 15 à 40 % en poids.
  10. Ruban de transfert thermique suivant la revendication 9, caractérisé en ce que le pigment de couleur est du noir de fumée.
  11. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce qu'une mince couche d'une cire ou d'une matière à consistance de cire qui présente une épaisseur d'application de 0,01 à 0,30 µm, notamment de 0,05 à 0,10 µm, se trouve au verso du support.
  12. Ruban de transfert thermique suivant au moins l'une des revendications précédentes, caractérisé en ce que le support est en poly(téréphtalate d'éthylène).
EP99106170A 1998-05-08 1999-04-08 Ruban pour le transfert thermique avec une couche de décollage Expired - Lifetime EP0955181B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19820779 1998-05-08
DE19820779A DE19820779A1 (de) 1998-05-08 1998-05-08 Thermotransferband

Publications (2)

Publication Number Publication Date
EP0955181A1 EP0955181A1 (fr) 1999-11-10
EP0955181B1 true EP0955181B1 (fr) 2001-07-18

Family

ID=7867208

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99106170A Expired - Lifetime EP0955181B1 (fr) 1998-05-08 1999-04-08 Ruban pour le transfert thermique avec une couche de décollage

Country Status (4)

Country Link
US (1) US6291055B1 (fr)
EP (1) EP0955181B1 (fr)
CA (1) CA2271428A1 (fr)
DE (2) DE19820779A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102658735B (zh) * 2012-05-31 2014-12-10 河南卓立膜材料股份有限公司 一种平压树脂基条码打印碳带及其制备方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3328990C2 (de) * 1983-08-11 1985-12-12 Pelikan Ag, 3000 Hannover Thermofarbband sowie Verfahren zu dessen Herstellung
US5219610A (en) * 1987-01-24 1993-06-15 Konica Corporation Thermal transfer recording medium and method for preparing the same
JPS6438271A (en) 1987-08-04 1989-02-08 Union Kemikaa Kk Thermal transfer ribbon
US5264279A (en) * 1989-09-19 1993-11-23 Dai Nippon Insatsu Kabushiki Kaisha Composite thermal transfer sheet
JPH0789253A (ja) * 1993-09-24 1995-04-04 Dainippon Printing Co Ltd 熱転写シート
DE19548033A1 (de) * 1995-12-21 1997-07-03 Pelikan Produktions Ag Thermotransferband
DE19548401A1 (de) * 1995-12-22 1997-07-03 Pelikan Produktions Ag Thermotransferband
DE19612393A1 (de) * 1996-03-28 1997-10-02 Pelikan Produktions Ag Thermotransferband
JP3825842B2 (ja) * 1996-08-28 2006-09-27 フジコピアン株式会社 ワンタイム型熱転写記録媒体

Also Published As

Publication number Publication date
DE19820779A1 (de) 1999-11-11
DE59900156D1 (de) 2001-08-23
EP0955181A1 (fr) 1999-11-10
CA2271428A1 (fr) 1999-11-08
US6291055B1 (en) 2001-09-18

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