EP0314205B1 - Heat-sensitive transfer recording medium - Google Patents

Heat-sensitive transfer recording medium Download PDF

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Publication number
EP0314205B1
EP0314205B1 EP88201709A EP88201709A EP0314205B1 EP 0314205 B1 EP0314205 B1 EP 0314205B1 EP 88201709 A EP88201709 A EP 88201709A EP 88201709 A EP88201709 A EP 88201709A EP 0314205 B1 EP0314205 B1 EP 0314205B1
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EP
European Patent Office
Prior art keywords
heat
recording medium
base film
transfer recording
sensitive transfer
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
EP88201709A
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German (de)
French (fr)
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EP0314205A1 (en
Inventor
Osamu Ikawa
Takashi Yamahata
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General Co Ltd
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General Co Ltd
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Publication date
Priority claimed from JP59147580A external-priority patent/JPS6127289A/en
Priority claimed from JP59172382A external-priority patent/JPS6151384A/en
Application filed by General Co Ltd filed Critical General Co Ltd
Priority to AT88201709T priority Critical patent/ATE71882T1/en
Priority to EP88201709A priority patent/EP0314205B1/en
Publication of EP0314205A1 publication Critical patent/EP0314205A1/en
Application granted granted Critical
Publication of EP0314205B1 publication Critical patent/EP0314205B1/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • B41M5/405—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 characterised by layers cured by radiation
    • 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
    • B41M5/446—Fluorine-containing polymers

Definitions

  • This invention relates to a heat-sensitive transfer recording medium.
  • Heat-sensitive transfer recording systems have many advantages as compared with prior art impact recording systems, for example the heat-sensitive transfer recording system permits noiseless printing and the printed letters are clear, of high quality and highly durable. Heat-sensitive transfer recording systems have therefore recently been extensively developed and are now widely used for printers and typewriters.
  • the base material of prior art heat-sensitive transfer recording media was paper but since paper has poor humidity resistance and gives poor printed letter sharpness, there have been recently used film bases, especially of PET (polyethylene telephthalate).
  • PET polyethylene telephthalate
  • PET has a relatively high melting point.
  • the surface temperature of the thermal printing heads reaches 300°C or higher and therefore, the so-called "stick” phenomenon is liable to occur, that is, the PET film is partly melted and fused to the thermal heads resulting in film movement past the heads being interrupted and at worst, being completely stopped to make printing impossible.
  • the coating material can be abraded off due to rubbing with the thermal heads and deposit on the thermal heads, resulting in formation of poor printed letters.
  • Another prior art method for improving the conveyance property is to use silicone resin, melamine resin or similar thermosetting resins for heat-sensitive paper and heat-sensitive transfer recording members, but this involves chemical reactions which are laborious; further the resulting coated recording medium suffers from curling.
  • resistive ribbon thermal transfer printing A further prior art procedure is that known as resistive ribbon thermal transfer printing.
  • IBM Technical Disclosure Bulletin, Vol. 25, No. 7B, December 1982 describes such resistive ribbons as consisting of aluminized PET coated with E-beam curable formulations of polyurethane acrylates, polyepoxy acrylates and silicon-modified polyurethane acrylates.
  • acrylate polymers are UV curable, they are not utilized for that property in such a context.
  • the present invention now seeks to provide a heat-sensitive transfer recording medium having a conveyance improving layer capable of preventing "stick", having a high film shapeability, not suffering from abrasion at the thermal heads and of high productivity and which is free from curling, and in which formation of the conveyance improving layer is simple to achieve.
  • a heat-sensitive transfer recording medium comprising a base film, a heat melting ink layer provided on the under surface of the base film, and a conveyance improving layer provided on the upper surface of the base film, the conveyance improving layer comprising an ultraviolet ray-curable resin which comprises a base polymer selected from polyester acrylates, polyurethane acrylates and epoxy acrylates, a reactive diluent composed of at least one selected from bifunctional monomers and trifunctional acrylate monomers, and a photosensitizer.
  • the accompanying drawing schematically shows a sectional view of a heat-sensitive transfer recording medium in accordance with the present invention.
  • the heat-sensitive transfer recording medium is constituted by a heat melting ink layer 3, a base film 2 overlying the heat melting ink layer 3 and a conveyance improving layer 1 overlying the base film 2.
  • polyester acrylates polyurethane acrylates
  • epoxy acrylates there are used.
  • polyester acrylate is preferred with respect to adhesion.
  • a bifunctional and/or a trifunctional acrylate monomer may be incorporated.
  • bifunctional monomer there may be used, for example, neopentyl glycol diacrylate and diethyleneglycol diacrylate.
  • trifunctional monomer there may be used, for example, pentaerythritol triacrylate and trimethylolpropane triacrylate.
  • incorporation of the bifunctional monomer results in lowering of the viscosity and improvement in workability while incorporation of the trifunctional monomer results in increase in cross-linking density and improvement in physical properties of the film after curing.
  • a photosensitizer may be added so as to more efficiently form radicals upon UV irradiation.
  • the photosensitizer there may be used, for example, biacetyl, acetophenone, benzophenone, Michler's ketone, benzil, benzoin, benzoin ethyl ether, benzoyl peroxide, benzoin isobutyl ether, benzyl dimethyl ketal, tetramethyl thiuram sulfide, azobis-isobutylonitrile, di-tert-butyl peroxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phentylpropan-1-one, 1,4-isopropylpenyl-2-hydroxy-2-methylpropan-1-one and methylbenzoyl formate.
  • a liquid composition prepared as mentioned above may be applied as a thin coating to the film base and irradiated with ultraviolet rays; curing is complete in several seconds to produce a hard film.
  • the cured film contains three dimensional cross-linking so that it has excellent heat resistance and good film-shapeability and can sufficiently withstand heating by the thermal printing heads.
  • the ultraviolet curable resins can be completely cured instantly so that the production efficiency is high and a roll film can be continuously treated and wound up immediately after treatment. Since high temperature treatment is not necessary, the base film is not subjected to any damage.
  • the resulting heat-sensitive transfer recording medium provided with a heat resistive conveyance improving layer composed of an ultraviolet cured resin on the reverse side, does not suffer from so-called "stick” phenomena and exhibits a very high production efficiency.
  • the resulting conveyance improving layer strongly adheres to the base film and does not peel off or fall off when rubbed with guide rolls or thermal print heads.
  • the base film there may be used for example, polyethylene terephthalate as mentioned above, polyethylene, polypropylene, polystyrene, polyesters, polyimides, triacetylcellulose, nylon and polycarbonates.
  • the medium is almost free from curling in addition to various advantages such as prevention of poor conveyance and easy and simple coating formation of the conveyance improving layer.
  • a resin liquid of the following formulation was prepared: Neopentylglycol diacrylate 30 parts by weight Pentaerythritol triacrylate 20 parts by weight Benzophenone 3 parts by weight Xylene 100 parts by weight Polyester acrylate of formula The polyester acrylate may be a mixture of compounds of various n values, in which n may be 2 - 20.
  • the resin liquid was applied to one surface of a 6 ⁇ m PET film by means of a roll-coater, to a thickness of 2 ⁇ m (when dried) at a speed of 20 m/minute, dried and exposed to UV radiation from two high pressure mercury lamps each of which had a capacity of 80 W/cm, and then the coated PET film was wound up in a form of a roll.
  • a printing test was carried out on the resulting heat-sensitive transfer recording medium using a P6 printer (manufactured by Fuji Xerox Co., Japan) and 1000 sheets of B-4 paper were printed. No sticking occurred and no materials became adhered to the guide rolls or the thermal print head during the course of the test. Good printing quality was obtained to the end of the test.

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

Abstract

A heat-sensitive transfer recording medium comprises a base film (2), a heat melting ink layer (3) provided on the under surface of the base film, and a conveyance improving layer (1) provided on the upper surface of the base film, the conveyance improving layer (1) comprising an ultraviolet ray-curable resin.

Description

  • This invention relates to a heat-sensitive transfer recording medium.
  • Heat-sensitive transfer recording systems have many advantages as compared with prior art impact recording systems, for example the heat-sensitive transfer recording system permits noiseless printing and the printed letters are clear, of high quality and highly durable. Heat-sensitive transfer recording systems have therefore recently been extensively developed and are now widely used for printers and typewriters.
  • The base material of prior art heat-sensitive transfer recording media was paper but since paper has poor humidity resistance and gives poor printed letter sharpness, there have been recently used film bases, especially of PET (polyethylene telephthalate). Among various suitable films, PET has a relatively high melting point. However, during printing, the surface temperature of the thermal printing heads reaches 300°C or higher and therefore, the so-called "stick" phenomenon is liable to occur, that is, the PET film is partly melted and fused to the thermal heads resulting in film movement past the heads being interrupted and at worst, being completely stopped to make printing impossible.
  • In order to improve film conveyance, it has been proposed to apply silicone or paraffin to the surface of the film or to form a heat resistant thermosetting resin layer, such as a urethane resin layer, or epoxy resin layer on the surface of the film. However, such countermeasures either cannot completely prevent "stick", or require prolonged heat treatment at high temperatures to cause curing and therefore, the working efficiency is very poor and the countermeasures are not useful in practice.
  • In addition, even when stick prevention is adequate, if film-shapeability of the coating material and adhesivity to the PET surface are poor, the coating material can be abraded off due to rubbing with the thermal heads and deposit on the thermal heads, resulting in formation of poor printed letters.
  • Another prior art method for improving the conveyance property is to use silicone resin, melamine resin or similar thermosetting resins for heat-sensitive paper and heat-sensitive transfer recording members, but this involves chemical reactions which are laborious; further the resulting coated recording medium suffers from curling.
  • A further prior art procedure is that known as resistive ribbon thermal transfer printing. IBM Technical Disclosure Bulletin, Vol. 25, No. 7B, December 1982 describes such resistive ribbons as consisting of aluminized PET coated with E-beam curable formulations of polyurethane acrylates, polyepoxy acrylates and silicon-modified polyurethane acrylates. Although such acrylate polymers are UV curable, they are not utilized for that property in such a context.
  • The present invention now seeks to provide a heat-sensitive transfer recording medium having a conveyance improving layer capable of preventing "stick", having a high film shapeability, not suffering from abrasion at the thermal heads and of high productivity and which is free from curling, and in which formation of the conveyance improving layer is simple to achieve.
  • According to the present invention, there is provided a heat-sensitive transfer recording medium comprising a base film, a heat melting ink layer provided on the under surface of the base film, and a conveyance improving layer provided on the upper surface of the base film, the conveyance improving layer comprising an ultraviolet ray-curable resin which comprises a base polymer selected from polyester acrylates, polyurethane acrylates and epoxy acrylates, a reactive diluent composed of at least one selected from bifunctional monomers and trifunctional acrylate monomers, and a photosensitizer.
  • The accompanying drawing schematically shows a sectional view of a heat-sensitive transfer recording medium in accordance with the present invention.
  • Referring to the drawing, the heat-sensitive transfer recording medium is constituted by a heat melting ink layer 3, a base film 2 overlying the heat melting ink layer 3 and a conveyance improving layer 1 overlying the base film 2.
  • Various UV curable resins may be used in the present invention. From the viewpoints of coating film strength and adhesion to the base film, however, there are used polyester acrylates, polyurethane acrylates and epoxy acrylates. In particular, when PET is used as the base film, polyester acrylate is preferred with respect to adhesion.
  • For the purpose of controlling the viscosity upon applying the resin to the surface of the base film and for improving the physical properties after curing, a bifunctional and/or a trifunctional acrylate monomer may be incorporated.
  • As the bifunctional monomer, there may be used, for example, neopentyl glycol diacrylate and diethyleneglycol diacrylate. As the trifunctional monomer, there may be used, for example, pentaerythritol triacrylate and trimethylolpropane triacrylate.
  • Incorporation of the bifunctional monomer results in lowering of the viscosity and improvement in workability while incorporation of the trifunctional monomer results in increase in cross-linking density and improvement in physical properties of the film after curing.
  • A photosensitizer may be added so as to more efficiently form radicals upon UV irradiation.
  • As the photosensitizer, there may be used, for example, biacetyl, acetophenone, benzophenone, Michler's ketone, benzil, benzoin, benzoin ethyl ether, benzoyl peroxide, benzoin isobutyl ether, benzyl dimethyl ketal, tetramethyl thiuram sulfide, azobis-isobutylonitrile, di-tert-butyl peroxide, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phentylpropan-1-one, 1,4-isopropylpenyl-2-hydroxy-2-methylpropan-1-one and methylbenzoyl formate.
  • A liquid composition prepared as mentioned above may be applied as a thin coating to the film base and irradiated with ultraviolet rays; curing is complete in several seconds to produce a hard film. The cured film contains three dimensional cross-linking so that it has excellent heat resistance and good film-shapeability and can sufficiently withstand heating by the thermal printing heads. Different from thermosetting resins, the ultraviolet curable resins can be completely cured instantly so that the production efficiency is high and a roll film can be continuously treated and wound up immediately after treatment. Since high temperature treatment is not necessary, the base film is not subjected to any damage.
  • The resulting heat-sensitive transfer recording medium provided with a heat resistive conveyance improving layer composed of an ultraviolet cured resin on the reverse side, does not suffer from so-called "stick" phenomena and exhibits a very high production efficiency.
  • In particular, where PET is used as the base film and a polyester acrylate is used as the ultraviolet curable resin, the resulting conveyance improving layer strongly adheres to the base film and does not peel off or fall off when rubbed with guide rolls or thermal print heads.
  • As the base film, there may be used for example, polyethylene terephthalate as mentioned above, polyethylene, polypropylene, polystyrene, polyesters, polyimides, triacetylcellulose, nylon and polycarbonates.
  • According to the invention, the medium is almost free from curling in addition to various advantages such as prevention of poor conveyance and easy and simple coating formation of the conveyance improving layer.
  • The following Example illustrates the invention.
    • Example
  • A resin liquid of the following formulation was prepared:
    Neopentylglycol diacrylate      30 parts by weight
    Pentaerythritol triacrylate      20 parts by weight
    Benzophenone      3 parts by weight
    Xylene      100 parts by weight
    Polyester acrylate of formula
    Figure imgb0001
    The polyester acrylate may be a mixture of compounds of various n values, in which n may be 2 - 20.
  • The resin liquid was applied to one surface of a 6 µm PET film by means of a roll-coater, to a thickness of 2 µm (when dried) at a speed of 20 m/minute, dried and exposed to UV radiation from two high pressure mercury lamps each of which had a capacity of 80 W/cm, and then the coated PET film was wound up in a form of a roll.
  • To the other surface of the PET film was applied a 4 µm coating of a hot melt ink of the following formulation by using a roll coater.
    Wax      70 parts by weight
    Carbon black      15 parts by weight
    Fatty acid amide      15 parts by weight
  • A printing test was carried out on the resulting heat-sensitive transfer recording medium using a P6 printer (manufactured by Fuji Xerox Co., Japan) and 1000 sheets of B-4 paper were printed. No sticking occurred and no materials became adhered to the guide rolls or the thermal print head during the course of the test. Good printing quality was obtained to the end of the test.

Claims (3)

  1. A heat-sensitive transfer recording medium which comprises a base film, a heat melting ink layer provided on the under surface of the base film, and a conveyance improving layer provided on the upper surface of the base film, the conveyance improving layer comprising an ultraviolet ray-curable resin which comprises a base polymer selected from polyester acrylates, polyurethane acrylates and epoxy acrylates, a reactive diluent composed of at least one selected from bifunctional acrylate monomers and trifunctional acrylate monomers, and a photosensitizer.
  2. A recording medium according to claim 1, wherein the base polymer is polyester acrylate.
  3. A recording medium according to claim 1 or claim 2, wherein the base film is polyethylene terephthalate.
EP88201709A 1984-07-18 1985-07-17 Heat-sensitive transfer recording medium Expired - Lifetime EP0314205B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT88201709T ATE71882T1 (en) 1984-07-18 1985-07-17 HEAT-SENSITIVE TRANSMISSION MEDIUM FOR RECORDING.
EP88201709A EP0314205B1 (en) 1984-07-18 1985-07-17 Heat-sensitive transfer recording medium

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP59147580A JPS6127289A (en) 1984-07-18 1984-07-18 Thermal transfer recording medium
JP147580/84 1984-07-18
JP172382/84 1984-08-21
JP59172382A JPS6151384A (en) 1984-08-21 1984-08-21 Thermal transfer recording body
EP88201709A EP0314205B1 (en) 1984-07-18 1985-07-17 Heat-sensitive transfer recording medium

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP85305105.0 Division 1985-07-17

Publications (2)

Publication Number Publication Date
EP0314205A1 EP0314205A1 (en) 1989-05-03
EP0314205B1 true EP0314205B1 (en) 1992-01-22

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EP88201709A Expired - Lifetime EP0314205B1 (en) 1984-07-18 1985-07-17 Heat-sensitive transfer recording medium

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EP (1) EP0314205B1 (en)
AT (1) ATE71882T1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0351187A (en) * 1989-07-19 1991-03-05 Mitsubishi Rayon Co Ltd Material to be recorded of sublimation type thermal transfer recording system
GB9011825D0 (en) * 1990-05-25 1990-07-18 Ici Plc Thermal transfer dyesheet
GB9011826D0 (en) * 1990-05-25 1990-07-18 Ici Plc Thermal transfer dyesheet
JPH05169597A (en) * 1991-12-19 1993-07-09 Diafoil Co Ltd Thermal transfer sheet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481255A (en) * 1982-05-10 1984-11-06 International Business Machines Corporation Radiation hardened transfer medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 25, no. 7B, December 1982, page 3700, New York, US; L.S. CHANG et al.: "E-beam curable formulations for the resistive ribbon of thermal transfer printing". *

Also Published As

Publication number Publication date
EP0314205A1 (en) 1989-05-03
ATE71882T1 (en) 1992-02-15

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