EP0882601A1 - Matériau d'enregistrement pour le transfert par la chaleur avec une couche de décollage contenant une cire - Google Patents

Matériau d'enregistrement pour le transfert par la chaleur avec une couche de décollage contenant une cire Download PDF

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Publication number
EP0882601A1
EP0882601A1 EP98110033A EP98110033A EP0882601A1 EP 0882601 A1 EP0882601 A1 EP 0882601A1 EP 98110033 A EP98110033 A EP 98110033A EP 98110033 A EP98110033 A EP 98110033A EP 0882601 A1 EP0882601 A1 EP 0882601A1
Authority
EP
European Patent Office
Prior art keywords
color
release layer
recording medium
thermal transfer
foundation
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
EP98110033A
Other languages
German (de)
English (en)
Other versions
EP0882601B1 (fr
Inventor
Jun Sogabe
Tetsuo Hoshino
Yoshiyuki Asabe
Susumu Arauchi
Yasutoshi Inoue
Osamu Ogiyama
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.)
Fujicopian Co Ltd
Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
Fuji Kagakushi Kogyo Co Ltd
Fujicopian 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
Application filed by Alps Electric Co Ltd, Fuji Kagakushi Kogyo Co Ltd, Fujicopian Co Ltd filed Critical Alps Electric Co Ltd
Publication of EP0882601A1 publication Critical patent/EP0882601A1/fr
Application granted granted Critical
Publication of EP0882601B1 publication Critical patent/EP0882601B1/fr
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
    • B41M5/40—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
    • B41M5/34—Multicolour thermography
    • B41M5/345—Multicolour thermography by thermal transfer of dyes or pigments

Definitions

  • the present invention relates to a thermal transfer recording medium for use in thermal transfer recording devices such as thermal printers and facsimile terminal equipments. More particularly, the present invention relates to a thermal transfer recording medium for formation of a multi-color or full-color image by superimposing transfer of plural different color inks.
  • thermo transfer recording medium for such a method there has been widely used one having the structure wherein a release layer comprising a wax as a main ingredient is interposed between a foundation and a color ink layer to improve the transferability.
  • the release layer comprising a wax as a main ingredient would exist on the top of first color ink dots formed on the receptor, thereby causing the problem wherein second color ink dots are not satisfactorily superimposed onto the first color ink dots due to the presence of the release layer on the first color ink dots.
  • the present invention provides a thermal transfer recording medium for forming a color image by superimposingly transferring plural different color inks, comprising a foundation and a color ink layer provided on the foundation, and a release layer comprising a wax interposed between the foundation and the color ink layer, wherein the thickness d 1 of the release layer for a first color and the thickness d 2 of the release layer for a second color satisfy the relationship represented by formula (I): d 1 ⁇ d 2 ⁇ 2.0 d 1
  • the thickness d 1 of the release layer for the first color is from 0.05 to 0.7 ⁇ m.
  • plural different color ink layers are disposed in a side-by-side relation on single foundation with respective release layers intervening therebetween
  • plural different color ink layers are disposed on separate foundations with respective release layers intervening therebetween.
  • Fig. 1 is a schematic sectional view showing a situation where a color image is formed by superimposing transfer using an example of the thermal transfer recording medium of the present invention on a thermal transfer printer.
  • Fig. 2 is a partial plan view showing a printing pattern of second color ink dots which is used in a printing test using the thermal transfer recording medium of the present invention
  • first color and second color used in the present invention is as follows: When two different color inks are superimposingly transferred one on the other, the one color which is transferred previous to the other color is “first color”, and the other color which is transferred on the first color is “second color”.
  • Y in some cases
  • M magenta
  • C cyan
  • release layer for a first color and "release layer for a second color” is as follows:
  • the release layer which is interposed between a foundation and a color ink layer giving a first color is the release layer for the first color.
  • the release layer which is interposed between a foundation and a color ink layer giving a second color is the release layer for the second color.
  • the thermal transfer recording medium of the present invention has the structure wherein a release layer comprising a wax as a main ingredient is interposed between a foundation and a color ink layer.
  • the thermal transfer recording medium of the present invention includes two embodiments: One embodiment wherein plural different color ink layers are disposed in a side-by-side relation on single foundation with respective release layers intervening therebetween; and Another embodiment wherein plural different color ink layers are disposed on separate foundations with respective release layers intervening therebetween.
  • the thermal transfer recording medium of the present invention is characterized in that the thickness d 1 of the release layer for a first color and the thickness d 2 of the release layer for a second color satisfy the relationship represented by formula ( I ): d 1 ⁇ d 2 ⁇ 2.0 d 1 and preferably the relationship represented by formula ( II ): 1.1 d 1 ⁇ d 2 ⁇ 1.5 d 1
  • the thickness d 1 of the release layer for the first color and the thickness d 2 of the release layer for the second color satisfy the relationship represented by formula ( I ), preferably the relationship represented by formula ( II ), a desired effect that second color ink dots can be satisfactorily transferred onto first color ink dots can be exhibited.
  • Fig. 1 is a schematic sectional view showing the situation where a color image is formed by superimposing transfer using the thermal transfer recording medium of the present invention on a thermal transfer printer.
  • reference numeral 1 denotes a thermal transfer recording medium having the structure wherein a color ink layer 4 is provided on a foundation 2 with a release layer 3 intervening between the foundation 2 and the color ink layer 4.
  • the recording medium 1 shown in Fig. 1 is adapted for the second color and the release layer 3 thereof has a thickness d 2 .
  • An ink image for the first color has been formed on a receptor (paper) B by using a recording medium for the first color (in Fig. 1, only one ink dot A is illustrated from the viewpoint of simple explanation).
  • the ink dot A is composed of a color ink layer 4a fixed to the receptor B and a release layer 3a present on the color ink layer 4a.
  • the recording medium 1 for the second color is superposed on the receptor B having the ink dot A thereon.
  • the combined recording medium 1/receptor B is heated from the side of foundation 2 with a thermal head (in Fig. 1, only one heating element T is illustrated).
  • the thickness d 2 of the release layer 3 for the second color is larger than the thickness d 1 of the release layer for the first color and, hence, larger than the thickness of the release layer 3a of the ink dot A for the first color.
  • the thickness of the release layer of an ink dot thermally transferred is the same as or a few smaller than the original thickness of the release layer in the recording media
  • the cohesive force F 2 of the release layer 3 is smaller than the cohesive force F 1 of the release layer 3a and, as a result, the color ink layer 4 is peeled on the side of the release layer 3, so that an almost perfect ink dot for the second color is transferred onto the ink dot A for the first color. That is, the size of the ink dot for the second color is almost the same as the size of the ink dot A for the first color.
  • ink dots for the second color are superimposingly transferred onto the ink dots in a predetermined region of a first color image, resulting in a desired subtractive color mixture to give a multi-color or full-color image with good color reproducibility.
  • d 1 and d 2 satisfy the relationship represented by formula ( II ): 1.1 d 1 ⁇ d 2 ⁇ 1.5 d 1
  • the thickness d 1 of the release layer for the first color is preferably from 0.05 to 0.7 ⁇ m.
  • the thickness of the release layer for the first color is smaller than the above range, the releasability of the release layer is prone to be insufficient.
  • the release layer for the first color is larger than the above range, the release layer for the first color is not cooled faster than the release layer for the second color during the transfer of the ink dots for the second color onto the ink dots for the first color, and the cohesive failure is likely to occur within the release layer for the first color, resulting in unsatisfactory superimposing transfer of the ink dots for the second color.
  • the thickness d 1 of the release layer for a first color is within the aforesaid range both in the case that a second color M is transferred onto a first color Y and in the case that a second color C is transferred onto a first color M.
  • the color ink layer there are usuallly used yellow, magenta and cyan ones.
  • a black ink layer is optionally used. Usually, however, the black ink layer is not superimposed on other color ink layers. In that case, the release layer corresponding to the back ink layer does not need to satisfy the aforesaid condition.
  • yellow, magenta and cyan ink layers and optionally a black ink layer may be disposed either on separate foundations or on single foundation
  • the respective color ink layers are disposed on single foundation, a yellow ink layer, a magenta ink layer and a cyan ink layer and optionally a black ink layer, each of which preferably has a given constant size, are repeatedly arranged in a side-by-side relation on single foundation in a recurring unit wherein the yellow, magenta and cyan ink layers and optionally the back ink layer are arranged in a predetermined order.
  • the order of arrangement of these three or four ink layers in the recurring unit can be arbitrarily determined in consideration of the superimposing order of the respective color ink layers or the like.
  • the respective release layers which are interposed between the foundation and the color ink layers in correspondence to the yellow, magenta and cyan ink layers and optionally the black ink layer are formed to have respective thicknesses satisfying the aforesaid condition in consideration of the transfer order of the respective color ink layers.
  • An example of the thremal transfer recording medium wherein the respective color ink layers are disposed on separate foundations comprises a combination of thremal transfer recording media comprising a first thermal transfer recording medium having a yellow ink layer on a first foundation, a second thermal transfer recording medium having a magenta ink layer on a second foundation and a third thermal transfer recording medium having a cyan ink layer on a third foundation, and optionally a fourth thermal transfer recording medium having a black ink layer on a fourth foundation
  • the respective release layers which are interposed between the respective foundations and color ink layers in correspondence to the yellow, magenta and cyan ink layers and optionally the black ink layer are formed to have respective thicknesses satisfying the aforesaid condition in consideration of the transfer order of the respective color ink layers.
  • Each of the release layers comprises a wax as a main ingredient thereof and may be incorporated with a thermoplastic resin, as required.
  • waxes examples include natural waxes such as lanolin, carnauba wax, candelilla wax, montan wax and ceresine wax; petroleum waxes such as paraffin wax and microcrystalline wax; synthetic waxes such as oxidized wax, synthetic ester wax, low molecular weight polyethylene wax, ⁇ -olefin-maleic anhydride copolymer wax, urethane wax, Fischer-Tropsch wax and synthetic petroleum wax. These waxes can be used either alone or in combination
  • thermoplastic resins examples include ethylene-vinyl acetate copolymer, ethylene-alkyl (meth)acrylate copolymer, vinyl chloride-vinyl acetate copolymer, polyesters, polyamides, epoxy resins, petroleum resins and rosin resins. These resins can be used either alone or in combination.
  • the desired effect of the present invention can be effectively exhibited when the release layer for the first color and the release layer for the second color are the same or similar with each other in their compositions and/or physical properties.
  • the melting point and/or the melt viscosity of the release layer for the first color are the same as or similar to the melting point and/or the melt viscosity of the release layer for the second color within the melting point range of 60°C to 90°C and the melt viscosity range of 1 to 1,000 cps/100°C.
  • Each of the color ink layers usable in the present invention is a heat-sensitive transferable color ink layer and comprises a coloring agent and a thermoplastic vehicle as main ingredients.
  • the thermoplastic vehicle comprises a wax and/or a themoplastic resin
  • the desired effect of the present invention can be outstandingly exhibited when the color ink layer is one having relatively high cohesive force wherein the vehicle thereof comprises a thermoplastic resin as a main ingredient.
  • each color ink layer preferably has a melt viscosity of 10 3 to 10 6 cps/160°C.
  • waxes examples include natural waxes such as lanolin, carnauba wax, candelilla wax, montan wax and ceresine wax; petroleum waxes such as parafin wax and microcrystalline wax; synthetic waxes such as oxidized wax, synthetic ester wax, low molecular weight polyethylene wax, ⁇ -olefin-maleic anhydride copolymer wax, urethane wax, Fischer-Tropsch wax and synthetic petroleum wax. These waxes can be used either alone or in combination.
  • thermoplastic resins examples include ethylene copolymers such as ethylene-vinyl acetate copolymer, ethylene-vinyl butyrate copolymer, ethylene-(meth)acrylic acid copolymer, ethylene-alkyl (meth)acrylate copolymer wherein examples of the alkyl group are those having 1 to 16 carbon atoms, such as methyl, ethyl, propyl, butyl, hexyl, heptyl, octyl, 2-ethylhexyl, nonyl, dodecyl and hexadecyl, ethylene-acrylonitrile copolymer, ethylene-acrylamide copolymer, ethylene-N-methylolacrylamide copolymer and ethylene-styrene copolymer; poly(meth)acrylic acid esters such as polylauryl methacrylate and polyhexyl acrylate; vinyl chloride
  • Coloring agents for yellow, magenta and cyan usable in the respective color ink layers are preferably transparent ones.
  • Examples of specific transparent coloring agents for yellow include organic pigments such as Naphthol Yellow S, Hansa Yellow 5G, Hansa Yellow 3G, Hansa Yellow G, Hansa Yellow GR, Hansa Yellow A, Hansa Yellow RN, Hansa Yellow R, Benzidine Yellow, Benzidine Yellow G, Benzidine Yellow GR, Permanent Yellow NCR and Quinoline Yellow Lake, and dyes such as Auramine. These coloring agents may be used either alone or in combination.
  • Examples of specific transparent coloring agents for magenta include organic pigments such as Permanent Red 4R, Brilliant Fast Scarlet, Brilliant Carmine BS, Permanent Carmine FB, Lithol Red, Permanent Red F5R, Brilliant Carmine 6B, Pigment Scarlet 3B, Rhodamine Lake B, Rhodamine Lake Y and Arizalin Lake, and dyes such as Rhodamine. These coloring agents may be used either alone or in combination.
  • Examples of specific transparent coloring agents for cyan include organic pigments such as Victoria Blue Lake, metal-free Phthalocyanine Blue, Phthalocyanine Blue and Fast Sky Blue, and dyes such as Victoria Blue. These coloring agents may be used either alone or in combination.
  • transparent pigment refers to a pigment which gives a tranparently colored ink when dispersed in a transparent vehicle.
  • coloring agents for black examples include pigments such as carbon black and Aniline Black, and dyes such as Nigrosine. These coloring agents may be used either alone or in combination.
  • each color ink layer is preferably from about 5 to about 60 % by weight.
  • Each color ink layer may be incorporated with a dispersing agent, an antistatic agent or the like, as required
  • the thickness of each color ink layer is preferably from about 0.5 to about 2.0 ⁇ m.
  • polyester films such as polyethylene terephthalate film, polyethylene naphthalate film and polyarylate film, polycarbonate film, polyamide film, aramid film, and other various plastic films commonly used for the foundation of ink ribbons of this type.
  • Thin paper sheets of high density such as condenser paper can also be used.
  • a conventionally known sticking-preventive layer may be provided on the back side (the side adapted to come into slide contact with a thermal head) of the foundation
  • Exampels of the materials for the sticking-preventive layer include various heat-resistant resins such as silicone resins, fluorine-containing resins and nitrocellulose resins, and other resins modified with these heat-resistant resins, such as silicone-modified urethane resins and silicone-modified acrylic resins, and mixtures of the foregoing heat-resistant resins and lubricating agent.
  • the thickness of the foundation is usually from about 1 to about 10 ⁇ m. From the viewpoint of reducing heat spreading to increase the resolution of images, the thickness of the foundation is preferably from 1 to 4.5 ⁇ m.
  • the formation of a color image with use of the thermal transfer recording medium of the present invention is preferably performed as follows: With use of a thermal transfer printer, the yellow ink layer (including the color ink layer and the corresponding release layer, hereinafter the same), the magenta ink layer and the cyan ink layer are selectively melt-transferred onto a receptor in a predetermined order according to respective separation color signals of an original color image, i.e. yellow signals, magenta signals and cyan signals to form yellow ink dots, magenta ink dots and cyan ink dots on the receptor in a predetermined order, yielding a yellow separation image, a magenta separation image and a cyan separation image superimposed on the receptor.
  • the order of transfer of the yellow ink layer, the magenta ink layer and the cyan ink layer can be determined as desired.
  • all the three color ink layers are selectively transferred according to three color signals to form three color separation images on the receptor.
  • the corresponding two of the three color ink layers are selectively transferred to form two color separation images of a yellow separation image, a magenta separation image and a cyan separation image.
  • thermal transfer recording medium of the present invention can also be applied to the formation of a color image wherein superimposing transfer is performed by a heating means other than the thermal head, for example, irradiation with laser beam.
  • a 2.5 ⁇ m-thick polyethylene terephthalate film provided on one side thereof with a 0.2 ⁇ m-thick sticking-preventive layer composed of a silicone-modified acrylic resin was used as a foundation.
  • a coating liquid for release layer with the following formula Onto the opposite side of the foundation with respect to the sticking-preventive layer was applied and dried a coating liquid for release layer with the following formula, thereby forming a release layer having a melting point of 75°C, a melt viscosity of 12 cps/100°C and the thickness after being dried as shown in Table 2.
  • a coating liquid for color ink layer (magenta or cyan) with the formula shown in Table 1 according to the combination shown in Table 2, thereby forming a 1.5 ⁇ m-thick color ink layer having a softening point of 65°C and a melt viscosity of 1.4 ⁇ 10 5 cps/160°C.
  • thermo transfer recording medium for cyan color (the first color)
  • solid-printing was performed on a sheet of plain paper under the printing conditions mentioned below.
  • one-dot printing was performed in the pattern shown in Fig. 2 under the same printing conditions as above by using the thermal transfer recording medium for magenta color (the second color).
  • reference numeral 10 denotes the solid-printed part for the first color
  • reference numeral 11 denotes the second color ink dots.
  • Transfer ratio (%) Number of ink dots perfectly transferred /cm 2 Total number of ink dots/cm 2 ⁇ 100
  • Thickness of release layer ( ⁇ m) Transfer ratio of second color ink dot (%) For cyan (first color) For magenta (second color) Ex.1 0.5 0.7 A Ex.2 0.3 0.5 A Com.Ex.1 0.8 2.0 C Com.Ex.2 0.8 1.0 B Com.Ex.3 0.8 0.5 C
  • the thermal transfer recording medium of the present invention has the structure wherein a release layer comprising a wax as a main ingredient thereof is interposed between a foundation and a color ink layer.
  • a release layer comprising a wax as a main ingredient thereof is interposed between a foundation and a color ink layer.
  • a thermal transfer recording medium for forming a color image by superimposingly transferring plural different color inks comprising a foundation and a color ink layer provided on the foundation, and a release layer comprising a wax interposed between the foundation and the color ink layer, wherein the thickness d 1 of the release layer for a first color and the thickness d 2 of the release layer for a second color satisfy the relationship represented by formula ( I ): d 1 ⁇ d 2 ⁇ 2.0 d 1

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
EP19980110033 1997-06-03 1998-06-02 Matériau d'enregistrement pour le transfert par la chaleur avec une couche de décollage contenant une cire Expired - Lifetime EP0882601B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP9145574A JPH10329435A (ja) 1997-06-03 1997-06-03 感熱転写記録媒体
JP14557497 1997-06-03
JP145574/97 1997-06-03

Publications (2)

Publication Number Publication Date
EP0882601A1 true EP0882601A1 (fr) 1998-12-09
EP0882601B1 EP0882601B1 (fr) 2001-02-28

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EP (1) EP0882601B1 (fr)
JP (1) JPH10329435A (fr)
DE (1) DE69800540T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1088678A1 (fr) * 1999-09-30 2001-04-04 Toppan Printing Co., Ltd. Support d'enregistrement par transfert thermique et méthode de formation d'images

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11208130A (ja) 1998-01-23 1999-08-03 Fujicopian Co Ltd 感熱転写記録媒体
JP4155656B2 (ja) 1999-03-02 2008-09-24 フジコピアン株式会社 熱転写記録媒体
JP2002019307A (ja) 2000-07-03 2002-01-23 Fujicopian Co Ltd カラー感熱転写記録媒体

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5053267A (en) * 1988-01-21 1991-10-01 Ricoh Company, Ltd. Thermosensitive image transfer recording medium
EP0510661A1 (fr) * 1991-04-26 1992-10-28 Fujicopian Co., Ltd. Méthode pour le transfert par sublimation et matériau pour le transfert thermique utilisé dans cette méthode
EP0698504A1 (fr) * 1994-08-26 1996-02-28 Fujicopian Co., Ltd. Matériau pour l'enregistrement par transfert thermique pour former des images en couleurs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5053267A (en) * 1988-01-21 1991-10-01 Ricoh Company, Ltd. Thermosensitive image transfer recording medium
EP0510661A1 (fr) * 1991-04-26 1992-10-28 Fujicopian Co., Ltd. Méthode pour le transfert par sublimation et matériau pour le transfert thermique utilisé dans cette méthode
EP0698504A1 (fr) * 1994-08-26 1996-02-28 Fujicopian Co., Ltd. Matériau pour l'enregistrement par transfert thermique pour former des images en couleurs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1088678A1 (fr) * 1999-09-30 2001-04-04 Toppan Printing Co., Ltd. Support d'enregistrement par transfert thermique et méthode de formation d'images
US6468379B1 (en) 1999-09-30 2002-10-22 Toppan Printing Co., Ltd. Thermal transfer recording medium and image forming method

Also Published As

Publication number Publication date
DE69800540T2 (de) 2001-08-09
DE69800540D1 (de) 2001-04-05
JPH10329435A (ja) 1998-12-15
EP0882601B1 (fr) 2001-02-28

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