EP0194860B1 - Wärmeempfindliches Übertragungsaufzeichnungsmaterial - Google Patents

Wärmeempfindliches Übertragungsaufzeichnungsmaterial Download PDF

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Publication number
EP0194860B1
EP0194860B1 EP19860301743 EP86301743A EP0194860B1 EP 0194860 B1 EP0194860 B1 EP 0194860B1 EP 19860301743 EP19860301743 EP 19860301743 EP 86301743 A EP86301743 A EP 86301743A EP 0194860 B1 EP0194860 B1 EP 0194860B1
Authority
EP
European Patent Office
Prior art keywords
layer
thermal
parts
thermal transfer
weight
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
EP19860301743
Other languages
English (en)
French (fr)
Other versions
EP0194860A2 (de
EP0194860A3 (en
Inventor
Seiji Ueyama
Hiroyasu Onoe
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.)
General Co Ltd
Original Assignee
General Co Ltd
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
Priority claimed from JP60047442A external-priority patent/JPS61206693A/ja
Priority claimed from JP60047440A external-priority patent/JPS61206696A/ja
Priority claimed from JP60047441A external-priority patent/JPH0651433B2/ja
Application filed by General Co Ltd filed Critical General Co Ltd
Priority to AT86301743T priority Critical patent/ATE76361T1/de
Publication of EP0194860A2 publication Critical patent/EP0194860A2/de
Publication of EP0194860A3 publication Critical patent/EP0194860A3/en
Application granted granted Critical
Publication of EP0194860B1 publication Critical patent/EP0194860B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41M5/38207—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

Definitions

  • This invention relates to a thermal transfer recording material for use in thermal transfer recording devices such as thermal facsimile machines, thermal printers and the like.
  • One particular thermal transfer recording material proposed for overcoming these drawbacks includes a fusible ink layer on a substrate.
  • the ink layer is contacted with ordinary receiving paper (recording paper) followed by heating with a thermal head through the substrate to melt the ink layer resulting in transfer of the heated portion to the receiving paper.
  • Such a procedure can result in good printed characters when the receiving paper has a high surface smoothness but when the smoothness is low, for example, the Bekk smoothness value is not higher than 50 sec., the ink layer contacts only some portions of the paper but there is no contact in other portions, because of the uneven surface. This results in a low transfer efficiency, formation of voids, and lack of image sharpness.
  • the ink since the ink has a high fluidity, the ink penetrates into the receiving paper so that the density of the printed characters is low and good printed images cannot be obtained.
  • US-A-4453839 describes a laminated thermal transfer medium which includes a resistive substrate layer top coated successively with aluminium, a release layer and an ink layer and bottom coated with graphite. That medium is used as a thermal printing ribbon having a lift-off correction capability, in that the ink layer is selected so as to adhere selectively to the paper being printed during the printing operation as a result of the release layer being heated to an elevated temperature, and to adhere selectively to the release layer upon that layer being heated to a lower temperature during lift-off correction.
  • the thermal transfer recording material according to the invention does not embody a lift-off correction capability; indeed, it seeks to provide a system for forming a positive and reliable bond between the characters and the paper or other surface onto which the characters are transferred.
  • a thermal transfer recording material which comprises a substrate layer having coated thereon a thermal release layer, a superposed thermal transfer ink layer having a melt viscosity higher than that of the thermal release layer and containing a coloring material dispersed in a heat fusible binder, and a surface cohesive layer coated on the thermal transfer ink layer and having a melt viscosity intermediate that of the thermal release layer and that of the thermal transfer ink layer.
  • the substrate layer of the materials of the present invention may consist of paper of, for example, less than 20 ⁇ m thick, such as glassine paper, condenser paper and the like, or a heat resistant film of, for example, less than 10 ⁇ m thick, such as polyester, polyimide, nylon, polypropylene and the like. Such plastics films from 2 to 10 ⁇ m thick are preferred.
  • the substrate layer is more preferably composed of a plastics film provided with a heat resistant protective layer on its surface opposite that coated with the thermal release layer, thermal transfer layer, and surface cohesive layer.
  • the heat resistant protective layer for the substrate may be of higher fatty acids, fluorocarbon polymers, silicone resins or the like.
  • thermal transfer ink layer has a high melt viscosity and is coated directly on the substrate, release of the transfer ink layer may become difficult. It is then necessary to facilitate release of the transfer ink layer from the substrate. This is achieved in accordance with the invention by coating on the substrate a thermal release layer. The melt viscosity of the thermal transfer ink layer can then be even greater so as to reduce penetration of the ink into the paper and effect transfer of ink in block form.
  • the thermal release layer is preferably such that it can be easily melted when heated and has a low melt viscosity.
  • the thermal release layer suitably comprises, for example, 50 to 100 parts by weight of wax, 0 to 30 parts by weight of binder, and 0 to 50 parts by weight of coloring agent or pigment.
  • the thermal transfer ink layer has a melt viscosity higher than that of the thermal release layer.
  • the thermal transfer ink layer Since the viscosity of the thermal transfer ink layer is high, there is little penetration of the ink into the receiving paper and printed characters of high density can be obtained. Even if the receiving paper is of less smoothness, the thermal transfer recording material can give a clear void-free record of high density at a high transfer efficiency.
  • the thermal transfer recording material comprises a surface cohesive layer coated on the thermal transfer ink layer, the surface cohesive layer having a melt viscosity intermediate that of the thermal release layer and that of the thermal transfer ink layer.
  • the thermal release layer is easily melted when heated and has a low melt viscosity. Also, it is preferred that the thermal transfer ink layer has a high melt viscosity. Further the surface cohesive layer preferably becomes cohesive when heated and its melt viscosity is between that of the thermal release layer and that of the thermal transfer ink layer.
  • the thermal transfer ink layer preferably comprises, for example, 0 to 30 parts by weight of wax, 20 to 50 parts by weight of binder and 40 to 80 parts by weight of pigment
  • the surface cohesive layer preferably comprises, for example, 0 to 50 parts by weight of wax, 50 to 80 parts by weight of binder and 0 to 50 parts by weight of pigment.
  • the thickness of the thermal release layer is preferably 1 to 4 ⁇ m, that of the thermal transfer ink layer is preferably 1 to 8 ⁇ m and that of the surface cohesive layer is preferably 1 to 8 ⁇ m.
  • the thermal transfer recording material according to the invention suitably has the following constitution: the thermal release layer is mainly composed of a low melting wax having a low melt viscosity; the thermal transfer ink layer is mainly composed of a pigment which hardly melts and has a weak film-shapability; and the surface cohesive layer is mainly composed of a binder which becomes cohesive when heated by a thermal printing head.
  • a thermal transfer recording material therefore includes a substrate on which there is coated a layer for facilitating the release of an ink layer (i.e. a thermal release layer), a layer which has only slight fluidity (i.e. a thermal transfer ink layer), and a surface layer which is cohesive and can adhere to a receiving paper (i.e. a surface cohesive layer).
  • This three-layer heat-sensitive transfer recording material acts in such a manner that the ink layer (color layer and cohesive layer) is released from the substrate by heating with a thermal head and the cohesion of the cohesive layer permits complete transfer of the ink layer to a receiving paper.
  • printed void-free images of high transfer efficiency can be produced.
  • the coloring agents contained in the thermal release layer may be dyes or coloring pigments; the pigments contained in the thermal transfer ink layer and optionally contained in the surface cohesive layer may be coloring pigments or extender pigments.
  • binders, waxes, and coloring agents which may be used in the thermal transfer recording material of the present invention are set out in the Table below.
  • the thermal transfer recording materials of the invention can be produced by conventional procedures.
  • the constituent components for the coating compositions for the thermal release layer, for the thermal transfer ink layer, and for the surface cohesive layer may be dispersed and mixed in heated ball mills or attrition mills or dispersed in solvents or water, and then successively applied to a substrate by hot melt coating, solvent coating or aqueous coating.
  • the ingredients for the heat resistant protective layer may be dispersed in and mixed with a solvent and applied by solvent coating to the opposite surface of the substrate before the other layers are applied.
  • An ink composed of the above ingredients was applied to a 6 ⁇ m polyester film in a thickness of 4 ⁇ m by means of hot melt coating.
  • a paraffin wax (m.p. 65°C) was applied to a 6 ⁇ m polyester film in a thickness of 1 ⁇ m by hot melt coating.
  • an ink composed of the following ingredients: Amount (parts) Solid content (%) Ethylene-vinyl acetate (90:10) copolymer emulsion (solid content, 45%) 60 69.2 Carnauba emulsion (solid content, 20%) 20 15.4 Carbon black dispersion (solid content 30%) 20 15.4 by Mayer bar coating and dried to form a heat-sensitive transfer ink layer of 4 ⁇ m thick.
  • Paraffin wax was applied to a 6 ⁇ m polyester film in a thickness of 1 ⁇ m by a hot melt coating method to form a heat-sensitive release layer.
  • thermosensitive release layer To the surface of the heat-sensitive release layer was applied a composition composed of the above components by a Mayer bar method, followed by drying to form a heat-sensitive transfer ink layer.
  • a composition composed of the above components was applied to a 6 ⁇ m polyester film in a thickness of 2 ⁇ m by a hot melt coating method to form a heat-sensitive release layer.
  • Heat-sensitive release layer
  • Paraffin wax was applied in a thickness of 1 ⁇ m by hot melt coating.
  • Thickness was 2 ⁇ m.
  • Thickness was 2 ⁇ m.
  • Coloring agent layer Component (parts) Solid matter(%) Ethylene-vinyl acetate (90:10) copolymer emulsion (solid matter 45%) 50 30.6 Zinc stearate dispersion (solid matter 30%) 50 20.4 Carbon black dispersion (solid matter 30%) 120 49.0
  • Heat-sensitive cohesive layer Component (parts) Solid matter(%) Ethylene-vinyl acetate (90:10) copolymer emulsion (solid matter 45%) 100 71.4 Carnauba emulsion (solid matter 30%) 30 14.3 Carbon black dispersion (solid matter 30%) 30 14.3
  • the above components were applied by solvent coating and dried.
  • the thickness was 2 ⁇ m.
  • the heat-sensitive transfer recording materials prepared above were tested by means of a heat-sensitive printer (cycle, 1.2 m/sec.; applied pulse width, 0.9 m sec., power, 0.5 W/Dot) with a receiving paper (Bekk test, 16 sec; Hammer Mill Bond paper) (JIS P8119).
  • the heat-sensitive transfer recording material prepared in the Comparative Examples gave many voids and low density images while those prepared in Examples 1 and 2 gave good printed characters of few voids and high density.

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

Claims (5)

  1. Thermisches Übertragungsaufzeichnungsmaterial für das Thermodrucken scharfer Übertragungsbilder, umfassend eine Substratschicht mit einer darauf aufbeschichteten thermischen Freisetzungsschicht, eine darüber angeordnete thermische Übertragungs-Druckfarbenschicht mit einer Schmelzviskosität, die höher ist, als die der thermischen Freisetzungsschicht und die ein in einem wärmeschmelzbaren Bindemittel dispergiertes Färbematerial enthält, und eine Oberflächen-Kohäsionsschicht, die auf der thermischen Übertragungs-Druckfarbenschicht aufbeschichtet ist und eine Schmelzviskosität besitzt, welche zwischen der der thermischen Freisetzungsschicht und der der thermischen Übertragungs-Druckfarbenschicht liegt.
  2. Thermisches Übertragungsaufzeichnungsmaterial nach Anspruch 1, wobei die Oberflächen-Kohäsionsschicht 0 bis 50 Gewichtsteile Wachs, 50 bis 80 Gewichtsteile Bindemittel und 0 bis 50 Gewichtsteile Färbemittel umfaßt.
  3. Thermisches Übertragungsaufzeichnungsmaterial nach Anspruch 1 oder 2, wobei die thermische Übertragungs-Druckfarbenschicht 0 bis 30 Gewichtsteile Wachs, 20 bis 50 Gewichtsteilel Bindemittel und 40 bis 80 Gewichtsteile Färbemittel umfaßt.
  4. Thermisches Übertragungsaufzeichnungsmaterial nach mindestens einem der Ansprüche 1 bis 3, wobei die thermische Freisetzungsschicht 50 bis 100 Gewichtsteile Wachs, 0 bis 30 Gewichtsteile Bindemittel und 0 bis 50 Gewichtsteile Färbemittel umfaßt.
  5. Thermisches Übertragungsaufzeichnungsmaterial nach mindestens einem der Ansprüche 1 bis 4, wobei das Substrat ein Kunststofffilm ist, der auf der der thermischen Freisetzungsschicht gegenüberliegenden Seite mit einer wärmebeständigen Schutzschicht beschichtet ist.
EP19860301743 1985-03-12 1986-03-11 Wärmeempfindliches Übertragungsaufzeichnungsmaterial Expired - Lifetime EP0194860B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86301743T ATE76361T1 (de) 1985-03-12 1986-03-11 Waermeempfindliches uebertragungsaufzeichnungsmaterial.

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP60047442A JPS61206693A (ja) 1985-03-12 1985-03-12 感熱転写記録媒体
JP60047440A JPS61206696A (ja) 1985-03-12 1985-03-12 感熱転写記録媒体
JP47441/85 1985-03-12
JP47440/85 1985-03-12
JP60047441A JPH0651433B2 (ja) 1985-03-12 1985-03-12 感熱転写記録媒体
JP47442/85 1985-03-12

Publications (3)

Publication Number Publication Date
EP0194860A2 EP0194860A2 (de) 1986-09-17
EP0194860A3 EP0194860A3 (en) 1987-12-23
EP0194860B1 true EP0194860B1 (de) 1992-05-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860301743 Expired - Lifetime EP0194860B1 (de) 1985-03-12 1986-03-11 Wärmeempfindliches Übertragungsaufzeichnungsmaterial

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EP (1) EP0194860B1 (de)
DE (1) DE3685351D1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3650618T2 (de) * 1985-08-12 1997-09-04 Gen Co Ltd Wärmeempfindliches Übertragungsaufzeichnungsmaterial
US4777079A (en) * 1986-09-12 1988-10-11 Ricoh Company, Ltd. Image transfer type thermosensitive recording medium
DE3703813A1 (de) * 1987-02-07 1988-08-18 Pelikan Ag Mehrfach ueberschreibbares thermofarbband
US4847237A (en) * 1987-06-25 1989-07-11 Minnesota Mining And Manufacturing Company Thermal mass transfer imaging system
DE3825438A1 (de) * 1988-07-27 1990-02-15 Pelikan Ag Thermofarbband sowie ein verfahren zu dessen herstellung
DE19548401A1 (de) * 1995-12-22 1997-07-03 Pelikan Produktions Ag Thermotransferband
US6057028A (en) * 1996-09-24 2000-05-02 Ncr Corporation Multilayered thermal transfer medium for high speed printing
EP0830953B1 (de) * 1996-09-24 2002-02-06 Ncr International Inc. Mehrschichtiges thermisches Übertragungsmaterial aus wässrigen Zusammensetzungen
CN105216460B (zh) * 2015-10-30 2018-05-01 河南卓立膜材料股份有限公司 一种水性油墨热转印色带及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5916950B2 (ja) * 1978-09-20 1984-04-18 三菱電機株式会社 インク熱転写記録媒体
JPS57185191A (en) * 1981-05-11 1982-11-15 Nec Corp Preparation of thermal transfer sheet
JPS58140297A (ja) * 1982-02-15 1983-08-19 Mitsubishi Electric Corp 感熱複写シ−ト
JPS58194594A (ja) * 1982-05-11 1983-11-12 Mitsubishi Paper Mills Ltd 秘密文書作成用転写シ−ト
JPS5916783A (ja) * 1982-07-20 1984-01-27 Dainippon Printing Co Ltd 感熱記録材料及び記録方法
US4651177A (en) * 1984-05-31 1987-03-17 Mitsubishi Paper Mills, Ltd. Thermal transfer recording material

Also Published As

Publication number Publication date
EP0194860A2 (de) 1986-09-17
EP0194860A3 (en) 1987-12-23
DE3685351D1 (de) 1992-06-25

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