EP2921314B1 - Wärmeempfindliches aufzeichnungsmedium und bildverarbeitungsverfahren - Google Patents

Wärmeempfindliches aufzeichnungsmedium und bildverarbeitungsverfahren Download PDF

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Publication number
EP2921314B1
EP2921314B1 EP15159372.0A EP15159372A EP2921314B1 EP 2921314 B1 EP2921314 B1 EP 2921314B1 EP 15159372 A EP15159372 A EP 15159372A EP 2921314 B1 EP2921314 B1 EP 2921314B1
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Prior art keywords
light
layer
recording medium
blocking layer
image
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English (en)
French (fr)
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EP2921314A3 (de
EP2921314A2 (de
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Shinya Kawahara
Tomomi Ishimi
Toshiaki Asai
Katsuya Ohi
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Ricoh Co Ltd
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Ricoh Co Ltd
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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
    • B41M5/46—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 the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
    • B41M5/465—Infrared radiation-absorbing materials, e.g. dyes, metals, silicates, C black
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/337—Additives; Binders
    • B41M5/3377—Inorganic compounds, e.g. metal salts of organic acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/04—Direct thermal recording [DTR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/18—Erasure; Erasable marking; Non-permanent marking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
    • B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/305—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers with reversible electron-donor electron-acceptor compositions
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/323—Organic colour formers, e.g. leuco dyes
    • 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
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
    • B41M5/333—Colour developing components therefor, e.g. acidic compounds

Definitions

  • thermoreversible recording medium In the case where laser light is used for recording a thermoreversible recording medium, moreover, the thermoreversible recording medium is excessively heated as image recording is repeated, which may cause a problem that unerased portions are remained due to the deterioration to thereby lower resistance to repetitive use.
  • thermosensitive recording medium which uses metal oxide particles as a photothermal converting material, has excellent image recording sensitivity and image erasing sensitivity, does not change its image recording sensitivity and image erasing sensitivity over time even when it is left outside, and irradiated with light, such as sun light, for a long period, and does not leave unerased portions after repetitive use.
  • thermosensitive recording medium of the present invention as the means for solving the aforementioned problems, contains:
  • the present invention can solve the aforementioned various problems in the art, achieve the aforementioned object, and provide a thermosensitive recording medium, which has excellent image recording sensitivity, and image erasing sensitivity, does not change the image recording sensitivity and image erasing sensitivity with time even when left to stand outdoor, and irradiated with light, such as sun light, for a long period, and does not cause an erasion failure due to repetitive use.
  • thermosensitive recording media of the first embodiment and the second embodiment of the present invention can be used for both an embodiment where a thermosensitive recording layer, to which write-only image recording is performed once, is provided as an image recording layer, and an embodiment where a thermoreversible recording layer, to which image recording and image erasing are repeatedly performed, is provided as an image recording layer. It is however particularly preferred that the thermosensitive recording medium is a thermoreversible recording medium, which can be used by repeatedly performing image recording and image erasing, as it can be used repeatedly.
  • the image recording layer is a thermosensitive recording layer.
  • the image recording layer is a thermoreversible recording layer.
  • the thermosensitive recording layer and the thermoreversible recording layer are separately explained, hereinafter.
  • thermosensitive recording layer contains at least a leuco dye, a color developer, and a binder resin, and may further contain other components, as necessary.
  • thermosensitive recording layer contains the metal oxide having absorbance in the near infrared region as in the first embodiment
  • an amount of the metal oxide is preferably 0.005 g/m 2 to 20 g/m 2 , more preferably 0.01 g/m 2 to 10 g/m 2 .
  • Examples of the metal oxide having absorbance in the near infrared region include a metal oxide having absorbance in the near infrared region, which is a wavelength region of 700 nm to 2,000 nm.
  • the metal oxide is preferably at least one selected from the group consisting of a tungsten oxide compound, indium-doped tin oxide, and antimony-doped tin oxide.
  • the aforementioned metal oxide having absorbance in the near infrared region has high resistance to heat, unlike an organic dye, such as phthalocyanine.
  • the metal oxide does not have an interaction with a leuco dye, when the metal oxide is missed with the leuco dye, and the absorbance thereof in the near infrared region does not decrease when the metal oxide is irradiated with laser light repeatedly. Therefore, use of the metal oxide gives an advantage that a highly durable thermosensitive recording medium can be attained.
  • the tungsten oxide compound the indium-doped tin oxide, and the antimony-doped tin oxide, the tungsten oxide compound and the indium-doped tin oxide are preferable, as they have low absorbance in the visible range, and the tungsten oxide compound is more preferable.
  • tungsten oxide compound examples include composite tungsten oxide particles represented by the general formula: WyOz (where W is tungsten, O is oxygen, and 2.2 ⁇ z/y ⁇ 2.999), and tungsten oxide particles represented by the general formula: MxWyOz (where M is at least one element selected from the group consisting of H, He, an alkali metal, an alkaline earth metal, a rare earth element, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, 0.001 ⁇ x/y ⁇ 1, and 2.2 ⁇ z/y ⁇ 3.0), as disclosed in International Patent Publication No.
  • the metal oxide having absorbance in the near infrared has absorbance in the near infrared region, which is a wavelength range of 700 nm to 2,000 nm, excellent recording sensitivity can be attained by setting a wavelength of laser light sued for recording and erasing of an image to the aforementioned wavelength range.
  • the average particle diameter of the metal oxide having absorbance in the near infrared region is preferably 800 nm or smaller to reduce absorbance in the visible region, and is preferably 200 nm or smaller to reduce scattering due to the particles.
  • the lower limit of the average particle diameter is preferably 1 nm or greater.
  • an amount of the metal oxide having absorbance in the near infrared region varies depending on a type of the metal oxide for use, and cannot be collectively determined. However, the amount thereof is preferably 0.005 g/m 2 to 20 g/m 2 , more preferably 0.01 g/m 2 to 10 g/m 2 , relative to a layer containing the metal oxide. When the amount thereof is less than 0.005 g/m 2 , sufficient recording sensitivity may not be attained. When the amount thereof is greater than 20 g/m 2 , a degree of tint on the background increases as the metal oxide has slight absorbance in the visible region, which reducing contrast of an image.
  • the metal oxide having absorbance in the near infrared region can be judged by measuring absorbance properties in the near infrared region by means of a spectrophotometer (U-4100, manufactured by Hitachi High-Technologies Corporation), as all of the metal oxides having the absorbance in the near infrared region have unique absorbance properties.
  • a spectrophotometer U-4100, manufactured by Hitachi High-Technologies Corporation
  • the leuco dye is appropriately selected from leuco dyes typically used for thermosensitive recording materials, without any limitation.
  • a leuco compound such as a triphenylmethane-based dye, a fluoran-based dye, a phenothiazine-based dye, an auramine-based dye, a spiropyran-based dye, an indolinophthalide-based dye, is preferably used.
  • leuco dye examples include 2-anilino-3-methyl-6-dibutylaminofluoran, 3,3-bis(p-dimethylaminophenyl)-phthalide, 3,3-bis(p-dimethylaminophenyl)-6-dimethylaminophthalide (another name: Crystal Violet Lactone), 3,3-bis(p-dimethylaminophenyl)-6-diethylaminophthalide, 3,3-bis(p-dimethylaminophenyl)-6-chlorophthalide, 3,3-bis(p-dibutylaminophenyl)phthalide, 3-cyclohexylamino-6-chlorofluoran,3-dimethylamino-5,7-dimethylfluoran, 3-diethylamino-7-chlorofluoran, 3-diethylamino-7-methylfluoran, 3-diethylamino-7,8-benzfluoran, 3-diethylamino-6-methyl-7
  • the color developer various electron-accepting compounds or oxidizing agents, which colors the leuco dye when they are in contact with the leuco dye, are suitably used.
  • the color developer is appropriately selected from those known in the art depending on the intended purpose without any limitation.
  • examples thereof include 4,4'-isopropylidenebisphenol, 4,4'-isopropylidenebis(o-methylphenol), 4,4'-sec-butylidenebisphenol, 4,4'-isopropylidenebis(2-tert-butylphenol), zinc p-nitrobenzoate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate, 2,2-(3,4'-dihydroxydiphenyl)propane, bis(4-hydroxy-3-methylphenyl)sulfide, 4- ⁇ -(p-methoxyphenoxy)ethoxy ⁇ salicylic acid, 1,7-bis(4-hydroxyphenylthio)-3,5-dioxaheptane, 1,5-bis(4-hydroxyphenylthio)-5-oxaheptane, monocalcium salt of monobenz
  • An amount of the color developer is preferably 1 part by mass to 20 parts by mass, more preferably 2 parts by mass to 10 parts by mass, relative to 1 part by mass of the leuco dye.
  • thermosensitive recording layer various thermoplastic materials can be used as a sensitivity improving agent.
  • thermoplastic material examples include fatty acid, fatty acid amide, fatty acid metal salt, p-benzylbiphenyl, terphenyl, triphenylmethane, benzyl p-benzyloxybenzoate, ⁇ -benzyloxynaphthalene, phenyl ⁇ -naphthoate, phenyl 1-hydroxy-2-naphthoate, methyl 1-hydroxy-2-naphthoate, diphenyl carbonate, dibenzyl terephthalate, dimethyl terephthalate, 1,4-dimethoxynaphthalene, 1,4-diethoxynaphthalene, 1,4-dibenzyloxynaphthalene, 1,2-bis(phenoxy)ethane, 1,2-bis(3-methylphenoxy)ethane, 1,2-bis(4-methylphenoxy)ethane, 1,4-bis(phenoxy)butane, 1,4-bis(phenoxy)-2-butene, 1,2-bis(
  • thermosensitive recording layer An antioxidant or photostabilizer is preferably added to the thermosensitive recording layer for the purpose of suppressing absorbance increase of the metal oxide in the infrared region due to light irradiation.
  • the antioxidant or photostabilizer is appropriately selected depending on the intended purpose without any limitation.
  • examples thereof include a phenol-based compound, a hindered phenol-based compound, an amine-based compound, a hindered amine-based compound, an amide-based compound, a sulfur-based compound, a thioether-based compound, a phosphorus-based compound, and a lactone-based compound.
  • a hindered phenol-based compound is preferable, as it has a large effect to the tungsten oxide compound.
  • hindered phenol-based compound examples include pentaerythritol-tetrakis(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate), thiodiethylene-bis(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate), octadecyl-3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, N,N'-hexan-1,6-diylbis(3-(3,5-di-t-butyl-4-hydroxyphenyl)propionamide), diethyl((3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methyl) phosphate, 3,3',3",5,5',5"-hexa-t-but
  • the filler examples include: inorganic powder, such as calcium carbonate, silica, zinc oxide, titanium oxide, aluminium hydroxide, zinc hydroxide, barium sulfate, clay, kaolin, talc, surface-treated calcium, and surface-treated silica; and organic powder, such as a urea-formaldehyde resin, a styrene/methacrylic acid copolymer, a polystyrene resin, and a vinylidene chloride resin.
  • inorganic powder such as calcium carbonate, silica, zinc oxide, titanium oxide, aluminium hydroxide, zinc hydroxide, barium sulfate, clay, kaolin, talc, surface-treated calcium, and surface-treated silica
  • organic powder such as a urea-formaldehyde resin, a styrene/methacrylic acid copolymer, a polystyrene resin, and a vinylidene chloride resin.
  • thermosensitive recording layer can be formed by a method generally known in the art without any limitation.
  • the thermosensitive recording layer can be formed by grinding and dispersing a leuco dye, and a color developer separately with a binder resin and other components by means of a disperser, such as a ball mill, Attritor, and a sand mill until the dispersed particle diameter thereof becomes 0.1 ⁇ m to 3 ⁇ m, blending the resultants with optional filler and/or a lubricant according to the predetermined formulation to thereby prepare a thermosensitive recording layer coating liquid, and applying the thermosensitive recording layer coating liquid onto a support.
  • a disperser such as a ball mill, Attritor, and a sand mill
  • the average thickness of the thermosensitive recording layer is appropriately selected depending on the intended purpose without any limitation, but the average thickness thereof is preferably 1 ⁇ m to 20 ⁇ m, more preferably 3 ⁇ m to 15 ⁇ m.
  • the gel fraction of the heat-crosslinkable resin is preferably 30% or greater, more preferably 50% or greater, and even more preferably 70% or greater. When the gel fraction is less than 30%, the crosslinked state is not sufficient, which may lead to insufficient durability.
  • thermoreversible recording layer Other components for use in the thermoreversible recording layer are appropriately selected depending on the intended purpose without any limitation. Examples thereof include a surfactant, and a plasticizer for the purpose of making image recording easier.
  • the average thickness of the photothermal conversion layer is appropriately selected depending on the intended purpose without any limitation, but the average thickness thereof is preferably 0.1 ⁇ m to 20 ⁇ m.
  • Examples of the azo-based compound and the disazo-based compound include Pigment Yellow 17, Pigment Yellow 55, Pigment Yellow 83, Pigment Yellow 169, Pigment Yellow 180, and Solvent Orange 54.
  • this phenomenon cannot expected because the leuco dye before reacting with a color developer does not typically have absorbance in a wavelength range of 420 nm to 430 nm or greater. To avoid this phenomenon, it is necessary to sufficiently block light of longer wavelengths, and it is more preferred that the transmittance of the light-blocking layer to light having a wavelength of 470 nm be 10% or less, and even more preferably 5% or less.
  • the average transmittance of the light-blocking layer to light in a wavelength range of 600 nm to 700 nm is preferably 80% or greater.
  • a bar code reader typically uses red light having the wavelength of around 650 nm. Therefore, it is preferred that the light-blocking layer transmit light having a wavelength around 650 nm. As a result of this, a contrast of an image recorded on the thermosensitive recording medium is sufficiently attained, and excellent bar code readability can be attained.
  • the average thickness of the ultraviolet ray-blocking layer is preferably 0.1 ⁇ m to 30 ⁇ m, more preferably 0.5 ⁇ m to 20 ⁇ m.
  • a dispersing device of the coating liquid, a coating method of the ultraviolet ray-blocking layer, and a curing method of the ultraviolet ray-blocking layer those used for the thermosensitive recording layer can be used.
  • the permeation of oxygen into the image recording layer can be provided by providing an oxygen barrier layer on the image recording layer in the thermosensitive recording medium. Therefore, use of the oxygen barrier layer can prevent an unerased portion to be left, or coloring of the back ground due to photodeterioration of the leuco dye contained in the image recording layer.
  • a material of the adhesive layer or bonding layer is appropriately selected depending on the intended purpose without any limitation, and examples thereof include a urea resin, a melamine resin, a phenol resin, an epoxy resin, a vinyl acetate -based resin, a vinyl acetate/acryl-based copolymer, an ethylene/vinyl acetate copolymer, an acryl-based resin, a polyvinyl ether-based resin, a vinyl chloride/vinyl acetate-based copolymer, a polystyrene-based resin, a polyester-based resin, a polyurethane-based resin, a polyamide-based resin, a polyolefin chloride-based resin, a polyvinyl butyral-based resin, an acrylic acid ester-based copolymer, a methacrylic acid ester-based copolymer, natural rubber, a cyanoacrylate-based resin, and a silicone-based resin. These materials may be crosslinked with a crosslinking
  • a hardness, contraction rate, flexibility, and coating film strength of a resin film can be appropriately adjusted by blending two or more monomers or oligomers listed above. Moreover, it is necessary to use a photopolymerization initiator, or a photopolymerization accelerator to cure the monomer or oligomer using ultraviolet rays.
  • an intermediate layer is preferably provided on the image recording layer for the purpose of improving the adhesion between the image recording layer and the oxygen barrier layer, or leveling a surface of the image recording layer.
  • thermosensitive recording medium an irreversible recording layer may be used in combination.
  • color tones of these recording layers may be different.
  • the color layer may be provided part or entire surface of the thermosensitive recording medium, which is the same or opposite side of the image recording layer, by providing the predetermined pattern by printing (e.g., offset printing, and gravure printing), or by means of an inkjet printer, a thermal transfer printer, or a dye-sublimation printer.
  • an OP varnish layer containing a curable resin as a main component may be provided on a part or entire surface of the color layer.
  • a dye or a pigment is simply added to any of the layers constituting the thermosensitive recording layer to color the layer.
  • FIG. 3A There is an embodiment where a support 101, and on the support, an image recording layer 102, a blue light-blocking layer 106, a ultraviolet ray-blocking layer 107, and an oxygen barrier layer 104 are provided in this order, as illustrated in FIG. 3A .
  • permeation of oxygen and ultraviolet rays to the blue light-blocking layer 106 is prevented, and therefore photodeterioration of the compound that absorbs, reflects, or scatters light in a wavelength range of 500 nm or shorter contained in the blue light-blocking layer 106, via oxygen, can be prevented.
  • a support 101, and on the support, an image recording layer 102, an oxygen barrier layer 104, a blue light-blocking layer 106, and an ultraviolet ray-blocking layer 107 are provided in this order, as illustrated in FIG. 3C .
  • light in a wavelength range of 500 nm or shorter does not reach the oxygen barrier layer 106, and therefore photodeterioration of the oxygen barrier layer can be prevented.
  • ultraviolet rays do not reach the blue light-blocking layer 106, and therefore photodeterioration of the compound that absorbs, reflects, or scatters light in a wavelength range of 500 nm or shorter contained in the blue light-blocking layer 106 can be prevented.
  • the image processing method of the present invention contains irradiating the thermosensitive recording medium of the present invention with light to perform image recording, or image erasing, or both.
  • the spot diameter of the laser light emitted in the image recording step is appropriately selected depending on the intended purpose without any limitation, but the spot diameter thereof is preferably 0.02 mm or greater, more preferably 0.1 mm or greater, and even more preferably 0.15 mm or greater.
  • the upper limit of the spot diameter of the laser light is appropriately selected depending on the intended purpose without any limitation, but the upper limit thereof is preferably 3.0 mm or less, more preferably 2.5 mm or less, and even more preferably 2.0 mm or less.
  • the width-direction collimating unit is appropriately selected depending on the intended purpose without any limitation, and examples thereof include a plane-convex cylindrical lens, and a combination of pluralities of convex cylindrical lens.
  • the wavelength of laser light emitted from the YAG laser, the fiber laser, the semiconductor laser, or the semiconductor laser array is in the visible to near infrared region (a several hundreds nanometers to about 2 ⁇ m), and use of such wavelength range has an advantage that a highly precise image can be formed because of short wavelengths.
  • the YAG laser, and the fiber laser have high outputs, and have an advantage that an image processing speed can be increased.
  • the semiconductor laser itself is small in size, and thus has an advantage of a down-sizing of a device, and moreover low cost. In case of use in a physical distribution line, therefore, semiconductor laser light is particularly preferably used.
  • thermoreversible recording layer coating liquid was applied on the support, to which the under layer had been formed, with a wire bar, and the coated layer was heated for 2 minutes at 100°C to dry. Thereafter, the dried layer was cured for 24 hours at 60°C, to thereby form a thermoreversible recording layer having a thickness of 10 ⁇ m.
  • thermoreversible recording medium of Example 5 was produced in the same manner as in Example 3, provided that the amount of the azo-compound (LIBERA COLOR TXL-200 YELLOW, manufactured by Cashew Co., Ltd.) serving as the compound that absorbed, reflected, or scattered light in a wavelength range of 500 nm or shorter, which was contained in the light-blocking layer, was changed from 1.3 parts by mass to 3.1 parts by mass.
  • the amount of the azo-compound LIBERA COLOR TXL-200 YELLOW, manufactured by Cashew Co., Ltd.
  • a ultraviolet ray-blocking layer was prepared by blending 5.0 parts by mass of a 40% by mass ultraviolet ray-absorbing polymer solution (UV-G302, manufactured by Nippon Shokubai Co., Ltd.), 0.5 parts by mass of hydrophobic silica (RX-200, manufactured by Nippon Aerosil Co., Ltd.), 1.0 part by mass of an isocyanate compound (Coronate HL, manufactured by Tosoh Corporation), and 12 parts by mass of methyl ethyl ketone, and sufficiently stirring the mixture.
  • a light-blocking layer coating liquid was prepared by blending 6.0 parts by mass of a 50% by mass acryl polyol resin solution (LR327, manufactured by Mitsubishi Rayon Co., Ltd.), 2.0 parts by mass of a screen ink containing a compound that absorbed, reflected, or scattered light in a wavelength range of 500 nm or shorter (Vinyl Ink H-type Half-tone (blue-yellow), manufactured by Jujo Chemical Co., Ltd.), 0.7 parts by mass of hydrophobic silica (RX-200, manufactured by Nippon Aerosil Co., Ltd.), and 9.5 parts by mass of methyl isobutyl ketone, and sufficiently stirring the mixture.
  • thermoreversible recording medium of Comparative Example 8 was produced in the same manner as in Example 3, provided that the light-blocking layer coating liquid was changed to the following light-blocking layer coating liquid.
  • a light-blocking layer coating liquid was prepared by blending 2.0 parts by mass of a 50% by mass acryl polyol resin solution (LR327, manufactured by Mitsubishi Rayon Co., Ltd.), 4.0 parts by mass of a screen ink containing a compound that absorbed, reflected, or scattered light in a wavelength range of 500 nm or shorter (Vinyl Ink H-type Half-tone (blue-yellow), manufactured by Jujo Chemical Co., Ltd.), 0.4 parts by mass of hydrophobic silica (RX-200, manufactured by Nippon Aerosil Co., Ltd.), and 4.0 parts by mass of methyl isobutyl ketone, and sufficiently stirring the mixture.
  • thermoreversible recording medium of Comparative Example 8 was measured by the spectrophotometer (U-4100, manufactured by Hitachi High-Technologies Corporation) in the same manner as in Example 1.
  • the average transmittance of the light-blocking layer of Comparative Example 8 to light in a wavelength range of 300 nm to 400 nm was 22.3%
  • the average transmittance to light in a wavelength range of 380 nm to 495 nm was 11.1%
  • the transmittance thereof to light having a wavelength of 470 nm was 10.4%.
  • a graph depicting a relationship between the wavelength and the transmittance of the light-blocking layer of Comparative Example 8 is presented in FIG. 14 .
  • thermosensitive recording media of Examples 1 to 2, and 5 were grade C. This is because the absorbed quantity of laser light did not change, as the absorbance at the wavelength of 980 nm hardly changed, and as a result, the thermosensitive recording medium was not excessively heated, and a writing line width did not change.
  • the bar codes recorded on the thermosensitive recording media of Comparative Examples 1 to 3 were grade F, and the bar codes could not be read. This is because the absorbed quantity of laser light increased due to the increase in the absorbance at the wavelength of 980 nm to excessively heat the thermosensitive recording medium, and thus the writing line width widened, and the bar code readability was degraded.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Claims (10)

  1. Wärmeempfindliches Aufzeichnungsmedium, umfassend:
    einen Träger (101);
    eine Bildaufzeichnungsschicht (102), welche auf dem Träger (101) bereitgestellt ist, und welche einen Leukofarbstoff, einen Farbentwickler und ein Metalloxid enthält, welches eine Absorbanz in dem Nahinfrarot-Bereich aufweist;
    eine Sauerstoffbarriere-Schicht (104); und
    eine lichtblockierende Schicht (103),
    wobei eine Sauerstoffbarriere-Schicht (104) und die lichtblockierende Schicht (103) auf einer Oberfläche der Bildaufzeichnungsschicht (102) bereitgestellt sind, welche eine Seite ist, die der Oberfläche derselben gegenüberliegt, wo der Träger (101) bereitgestellt ist, dadurch gekennzeichnet, dass
    eine durchschnittliche Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht in einem Wellenlängenbereich zwischen 300 nm und 400 nm kleiner oder gleich 5% ist, und eine durchschnittliche Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht in einem Wellenlängenbereich zwischen 380 nm und 495 nm kleiner oder gleich 20% ist.
  2. Wärmeempfindliches Aufzeichnungsmedium, umfassend:
    einen Träger (101);
    eine Bildaufzeichnungsschicht (102), welche einen Leukofarbstoff und einen Farbentwickler enthält;
    eine photothermische Konversionsschicht (105), welche ein Metalloxid enthält, welches eine Absorbanz in dem Nahinfrarot-Bereich aufweist;
    eine Sauerstoffbarriere-Schicht (104); und
    eine lichtblockierende Schicht (103),
    wobei die Bildaufzeichnungsschicht (102) und die photothermische Konversionsschicht (105) auf dem Träger (101) bereitgestellt sind, und die Sauerstoffbarriere-Schicht (104) und die lichtblockierende Schicht (103) auf einer Oberfläche der Bildaufzeichnungsschicht (102) oder der photothermischen Konversionsschicht (105) bereitgestellt sind, welche eine Seite ist, die der Oberfläche derselben gegenüberliegt, wo der Träger (101) bereitgestellt ist, dadurch gekennzeichnet, dass
    eine durchschnittliche Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht in einem Wellenlängenbereich zwischen 300 nm und 400 nm kleiner oder gleich 5% ist, und eine durchschnittliche Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht in einem Wellenlängenbereich zwischen 380 nm und 495 nm kleiner oder gleich 20% ist.
  3. Wärmeempfindliches Aufzeichnungsmedium nach Anspruch 1 oder 2, wobei die durchschnittliche Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht in einem Wellenlängenbereich zwischen 380 nm und 495 nm kleiner oder gleich 10% ist.
  4. Wärmeempfindliches Aufzeichnungsmedium nach einem der Ansprüche 1 bis 3, wobei eine Lichtdurchlässigkeit der lichtblockierenden Schicht (103) gegenüber Licht mit einer Wellenlänge von 470 nm kleiner oder gleich 10% ist.
  5. Wärmeempfindliches Aufzeichnungsmedium nach einem der Ansprüche 1 bis 4, wobei die lichtblockierende Schicht (103) eine Ultraviolettstrahlen-blockierende Schicht (107) und eine Blaulicht-blockierende Schicht (106) umfasst.
  6. Wärmeempfindliches Aufzeichnungsmedium nach einem der Ansprüche 1 bis 5, wobei das Metalloxid, welches eine Absorbanz in dem Nahinfrarot-Bereich aufweist, eine Wolframoxidverbindung, ein Indium-dotiertes Zinnoxid, oder ein Antimon-dotiertes Zinnoxid oder irgendeine Kombination davon ist.
  7. Wärmeempfindliches Aufzeichnungsmedium nach einem der Ansprüche 1 bis 6, wobei das Metalloxid, welches eine Absorbanz in dem Nahinfrarot-Bereich aufweist, eine Wolframoxidverbindung ist.
  8. Wärmeempfindliches Aufzeichnungsmedium nach einem der Ansprüche 1 bis 7, wobei die Sauerstoffbarriere-Schicht (104) aus einer ersten Sauerstoffbarriere-Schicht und einer zweiten Sauerstoffbarriere-Schicht besteht, und wobei die erste Sauerstoffbarriere-Schicht auf einer Oberfläche der Bildaufzeichnungsschicht (102) oder der photothermischen Konversionsschicht (105) bereitgestellt ist, welche eine Seite ist, die der Oberfläche derselben gegenüberliegt, wo der Träger (101) bereitgestellt ist, und die zweite Sauerstoffbarriere-Schicht zwischen der Bildaufzeichnungsschicht (102) und dem Träger (101) bereitgestellt ist, oder auf einer Oberfläche des Trägers (101) bereitgestellt ist, welche eine Seite ist, die der Oberfläche derselben gegenüberliegt, wo die Bildaufzeichnungsschicht (102) bereitgestellt ist, oder sowohl dazwischen als auch darauf bereitgestellt ist.
  9. Bildverarbeitungsverfahren, umfassend:
    Bestrahlen des wärmeempfindlichen Aufzeichnungsmediums nach einem der Ansprüche 1 bis 8 mit Licht, um eine Bildaufzeichnung oder eine Bildlöschung oder beide auszuführen.
  10. Bildverarbeitungsverfahren nach Anspruch 9, wobei das Licht, mit dem das wärmeempfindliche Aufzeichnungsmedium bestrahlt wird Nahinfrarot-Laserlicht in einem Wellenlängenbereich zwischen 700 nm und 2 000 nm ist.
EP15159372.0A 2014-03-18 2015-03-17 Wärmeempfindliches aufzeichnungsmedium und bildverarbeitungsverfahren Active EP2921314B1 (de)

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