EP0955182A2 - Ruban pour le transfert thermique - Google Patents

Ruban pour le transfert thermique Download PDF

Info

Publication number
EP0955182A2
EP0955182A2 EP99108563A EP99108563A EP0955182A2 EP 0955182 A2 EP0955182 A2 EP 0955182A2 EP 99108563 A EP99108563 A EP 99108563A EP 99108563 A EP99108563 A EP 99108563A EP 0955182 A2 EP0955182 A2 EP 0955182A2
Authority
EP
European Patent Office
Prior art keywords
thermal transfer
transfer ribbon
approximately
weight
wax
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.)
Granted
Application number
EP99108563A
Other languages
German (de)
English (en)
Other versions
EP0955182A3 (fr
EP0955182B1 (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 EP0955182A2 publication Critical patent/EP0955182A2/fr
Publication of EP0955182A3 publication Critical patent/EP0955182A3/fr
Application granted granted Critical
Publication of EP0955182B1 publication Critical patent/EP0955182B1/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
    • B41M5/382—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
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents

Definitions

  • the invention relates to a thermal transfer ribbon with a carrier, with a thermal transfer ink formed on one side of the carrier and optionally with further layers, the thermal transfer ink containing an amorphous polymer and a wax in addition to a colorant.
  • a thermal transfer ribbon of the type described above can be found in DE 36 13 846.
  • the thermal transfer ink of this known thermal transfer ribbon contains an amorphous polymer which has a weight average molecular weight Mw of not more than 10,000, a number average molecular weight Mn of less than 5,000 and a glass transition temperature of 50 to 80 ° C.
  • the amorphous polymer makes up at least 50% by weight of the thermal transfer ink, based on its solids content.
  • This thermal transfer ribbon should enable clear color reproduction when printing and in terms of resolution and sensitivity. Transfer and fixation properties should be satisfactory.
  • a small amount of a "release agent” is incorporated into the thermal transfer ink, which increases the image quality and in particular the resolution.
  • the aim is to achieve an excellent fixation by taking advantage of the flexibility and abrasion resistance that is inherent in polymers. Achieving scratch-resistant prints on which, among other things, the invention described below is not explicitly addressed here.
  • EP-B-0 380 920 and DE 196 12 393 A1 deal in particular with the question of obtaining scratch-resistant printouts:
  • EP-B-0 380 920 recommends Achieving scratch-resistant printouts that the thermal transfer ink contains non-melting, colorant-containing polymer spheres during the printing process, which can be melted in a heat treatment downstream of the printing process.
  • the symbols obtained immediately after the printing process initially do not show the desirable scratch resistance. This is achieved by adding more heat to the symbol. This creates a new structure for the printed symbol.
  • This proposal is disadvantageous in that it requires a second heat treatment step after the actual printing process.
  • DE 196 12 393 A1 provides a certain remedy here. It proposes a thermal transfer ribbon with a conventional carrier, with a layer of a thermal transfer ink formed on one side of the carrier and a separating layer between the carrier and the layer of thermal transfer ink.
  • the separating layer is wax-bound and contains waxes with a melting point of approximately 70 to 110 ° C. and a polymeric wax plasticizer with a glass transition temperature Tg of -30 to + 70 ° C.
  • the layer of thermal transfer ink further contains at least about 20% by weight of natural resin, modified natural resin and / or synthetic resin.
  • a thermal transfer ribbon is provided, the transferred thermal transfer color of which shows good adhesion and good abrasion and scratch resistance when printed, in particular on paper labels, and is released quickly and precisely during the printing process with the separating or release layer underneath.
  • the disadvantage is, however, that the separation layer described has to be formed with a certain effort, which means that it is an at least three-layer system.
  • the present invention is based on the object of developing the thermal transfer ribbon described at the outset in such a way that no separating layer is required, and yet the advantages achieved in connection with the description of the subject matter of DE 196 12 393 A1 are achieved.
  • the thermal transfer ink contains, as a binder, a polar polyethylene wax and an amorphous polymer which has a weight average molecular weight Mw of more than about 10,000 and a number average molecular weight Mn of less than about 6,000.
  • the thermal transfer ink of the thermal transfer ribbon contains an amorphous polymer as the essential binder component, in particular of at least about 50% by weight, based on the dry substance component of the thermal transfer ink.
  • an amorphous polymer when one speaks of an "amorphous" polymer, this is supposed to mean that its structural characteristics appearing from an X-ray point of view. can be described as amorphous. Accordingly, the term "amorphous polymer” should also include those oligomers and / or polymers which contain certain partially crystalline fractions, for example up to about 30% by weight, in particular up to about 10% by weight. Contrary to the indications given in DE 36 13 846 C2, the invention uses an amorphous polymer which has a weight average molecular weight Mw of more than about 10,000.
  • the amorphous polymer has a weight average molecular weight Mw of 10,000 to about 15,000 and a number average molecular weight Mn of less than about 5,000, in particular about 2,000 to 3,000.
  • Mw weight average molecular weight
  • Mn number average molecular weight
  • the amorphous polymer content is less than about 50% by weight, this can result in the desirable transparency of the thermal transfer ink and thus the color reproducibility being impaired. In general, it is therefore preferred if the content of the amorphous polymer is more than about 50% by weight, in particular more than about 70% by weight, although the maximum value could be given as about 80% by weight to have a sufficient amount of polar polyethylene wax.
  • binders are present in small amounts in the thermal transfer ink, for example waxes used in thermal transfer ribbons, for example paraffin wax, caranauba wax, montan wax, beeswax, Japanese wax, candelilla wax and also as Plastic binders used materials, such as polyolefins with an average molecular weight of about 1,000 to 10,000, for example low molecular weight polyethylene, polypropylene or polybutylene and the like.
  • plastic binders used materials such as polyolefins with an average molecular weight of about 1,000 to 10,000, for example low molecular weight polyethylene, polypropylene or polybutylene and the like.
  • other common additives that improve the properties of the tape.
  • the person skilled in the art will select the one with which he would like to set a desired effect.
  • amorphous polymers examples include homopolymers and copolymers, styrene or their derivatives or substituted compounds thereof (for example styrene, vinyl, toluene), acrylic acid esters, for example methyl acrylate, ethylene acrylate and butyl acrylate copolymers, in particular polyester resins, which can be obtained by polycondensation of saturated dibasic acid (for example phthalic acid, phthalic anhydride), polycarbonates, polyamides, epoxy resins, polyurethanes, silicone resins, phenolic resins, terpene resins, petroleum resins, hydrogenated petroleum resins, alkyd resins and cellulose derivatives.
  • saturated dibasic acid for example phthalic acid, phthalic anhydride
  • polyester resins which can be obtained by polycondensation of saturated dibasic acid (for example phthalic acid, phthalic anhydride), polycarbonates, polyamides, epoxy resins, polyurethanes, silicone resins, phenol
  • An amorphous polyester resin that fulfills these framework conditions and is used particularly advantageously is a polyester resin based on bisphenol A, such as the commercial product Setafix P 120 (sold by Akzo Noble Resins BV, the Netherlands), which is characterized by the following characteristics: MFI -Value (105 ° C / 2.16 kg) from about 1.5 to 2.0 g / min, glass transition temperature Tg from 52 to 56 ° C and acid number from 14 to 24 mg KOH / g, Mn value about 2,500 and Mw value about 12,000.
  • a polyester resin of the trade name Atlac T 500 (sold by ICI Specialty Chemicals, Great Britain) is also suitable. This is a linear, unsaturated polyester resin that was originally used to make dry toners.
  • polar polyethylene wax Another important binder component is the mentioned polar polyethylene wax.
  • Such waxes are obtained either by oxidation of polyethylene wax or by oxidative degradation of plastic-like polyethylene. This creates a range of polar, emulsifiable polyethylene waxes.
  • the so-called Hoechst waxes PED and the type designations 521 and 522 are particularly suitable. These belong to the series of the more flexible emulsifiable polyethylene waxes, the melting point of which allows emulsification in an open vessel.
  • a preferred dropping point of about 100 to 110 ° C, in particular about 102 to 108 ° C and very particularly preferably of about 102 to 106 ° C, measured in accordance with DIN 51 801, is the preferred framework for the polar polyethylene waxes polar polyethylene wax the following sizes are given: ball pressure hardness according to the test method DGF-M III-90 (57) from about 100 to 300 bar, a flow hardness of about 100 to 300 bar and a viscosity, measured according to DIN 51 550 at a temperature of about 120 ° C, of about 50 to 700 mPas, in particular from about 100 to 500 mPas.
  • the thermal transfer ink can be colored by any colorant. It can be pigments, such as, in particular, carbon black, but also solvent-based and / or binder-soluble colorants, such as the commercial product Basoprint, organic color pigments and various azo colorants (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 color pigment, in an amount of about 20 to 40% by weight.
  • the thermal transfer ink preferably has a viscosity of about 500 to 3,000 mPas, measured with a Brookfield rotary viscometer at 140 ° C. In particular, the range from 600 to 1,500 mPas is aimed for.
  • the thickness of the thermal transfer ink or ink layer is not critical. A thickness of approximately 1 to 5 g / m 2 application, in particular approximately 1 to 3 g / m 2 application, is preferred on the carrier.
  • the type of carrier is also not critical here. It is preferably a film made of polyethylene terephthalate (PET) or a capacitor paper.
  • PET polyethylene terephthalate
  • the selection parameters are the highest possible tensile elongation values and thermal stability with small film thicknesses, for example in the range of approximately 1 to 6 ⁇ m.
  • the PET films are available up to about 2.5 ⁇ m, capacitor paper up to about 6 ⁇ m.
  • This back coating material preferably consists of paraffin, silicone, natural waxes, in particular carnauba wax, beeswax, ozocerite and paraffin wax or synthetic waxes, in particular acid waxes, ester waxes, partially saponified ester waxes and polyethylene waxes, glycols or polyglycols and / or surfactants.
  • the range of 1.4 to 2.0 g / m 2 , in particular approximately 1.6 to 1.8 g / m 2 is very particularly preferred for the strength of the thermal transfer ink.
  • the above-mentioned backside coating is optionally applied on the back in a thickness of about 0.01 to 1 g / m 2 , in particular about 0.05 to 0.10 g / m 2 .
  • These layers can be formed in a variety of ways using customary application methods. This can be done, for example, by spraying on or printing on a solution or dispersion, be it with water or an organic solvent, by applying from the melt, which applies in particular to the thermal transfer layer, or by applying a doctor blade in the form of an aqueous suspension with finely divided therein material to be applied. Coating methods such as reverse roll and / or gravure coating have proven to be particularly advantageous for the application of the thermal transfer layer.
  • the invention does not require an additional separating layer in comparison with DE 196 12 393 A1 and requires two layers in total, a back coating advantageously being provided for the reasons mentioned is. Not only scratch-resistant but also solvent-resistant prints are achieved on plastic labels, especially in Connection with so-called barcode labels.
  • the present invention uses amorphous polymers with an Mw of more than 10,000.
  • This feature in conjunction with the polar polyethylene wax used according to the invention works in a functional interaction in such a way that the essential properties that have to be placed on such a tape are not impaired, but that the thermal transfer ink transferred during printing, in particular on plastic labels, has good adhesion and good abrasion resistance. and shows scratch resistance and is transferred quickly and precisely.
  • plastic labels such as those made of polyethylene, polypropylene, vinyl chloride, coated PET films and glossy papers.
  • These favorable results are achieved in the upper energy level of the thermal transfer printer.
  • the polyethylene waxes used apparently serve to impart a good release function and thus make the adhesion to the printed film more flexible. Due to their good sliding behavior, they convey the particularly favorable scratch resistance of the printouts.
  • a material of the following recipe is applied to a conventional carrier made of polyethylene terephthalate with a thickness of about 4.5 ⁇ m to form a thermal transfer color layer: Parts by weight Polyester resin based on a bisphenol A (trade name: Setafix P 120, sold by Akzo Nobel Resins BV) 60 Polar polyethylene wax (trade name: PED 521, sold by Hoechst AG) 7.5 Polar polyethylene (trade name: P 522, sold by Hoechst AG) 7.5 soot 25th total 100
  • the above material is applied by the reverse roll method in a solvent dispersion about 20% (toluene / isopropanol: 80:20) in a dry thickness of about 1.5 microns.
  • the solvent is evaporated by passing hot air at a temperature of about 100 ° C.
  • the material obtained was found to be scratch and solvent resistant when printed at the high energy level of a thermal transfer printer.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP99108563A 1998-05-08 1999-05-05 Ruban pour le transfert thermique Expired - Lifetime EP0955182B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19820778A DE19820778C2 (de) 1998-05-08 1998-05-08 Thermotransferband
DE19820778 1998-05-08

Publications (3)

Publication Number Publication Date
EP0955182A2 true EP0955182A2 (fr) 1999-11-10
EP0955182A3 EP0955182A3 (fr) 2000-09-06
EP0955182B1 EP0955182B1 (fr) 2003-08-27

Family

ID=7867207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99108563A Expired - Lifetime EP0955182B1 (fr) 1998-05-08 1999-05-05 Ruban pour le transfert thermique

Country Status (4)

Country Link
US (1) US6461721B1 (fr)
EP (1) EP0955182B1 (fr)
CA (1) CA2271434A1 (fr)
DE (2) DE19820778C2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10152849A1 (de) * 2001-10-29 2003-05-28 Emtec Magnetics Gmbh Beschichtung eines Thermotransfer- und/oder Thermosublimationsproduktes, Verfahren zu dessen Herstellung sowie dessen Verwendung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941596A (en) * 1962-10-24 1976-03-02 E. I. Du Pont De Nemours And Company Thermographic processes using polymer layer capable of existing in metastable state
DE3328990C2 (de) * 1983-08-11 1985-12-12 Pelikan Ag, 3000 Hannover Thermofarbband sowie Verfahren zu dessen Herstellung
GB2176903B (en) * 1985-04-24 1989-08-02 Fuji Xerox Co Ltd Image recording material for heat sensitive hot-melt transfer recording.
GB2178553B (en) * 1985-07-29 1990-01-04 Canon Kk Thermal transfer material
US4762734A (en) * 1986-11-24 1988-08-09 Xerox Corporation Processes for thermal transfer ink donor films
EP0351794A3 (fr) * 1988-07-19 1991-03-13 Nitto Denko Corporation Encre fixable par la chaleur, feuille de dessins l'utilisant et méthode pour la formation d'un dessin

Also Published As

Publication number Publication date
DE19820778C2 (de) 2003-02-20
CA2271434A1 (fr) 1999-11-08
DE59906727D1 (de) 2003-10-02
EP0955182A3 (fr) 2000-09-06
US6461721B1 (en) 2002-10-08
EP0955182B1 (fr) 2003-08-27
DE19820778A1 (de) 1999-11-11

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