WO2004066292A1 - 情報記録媒体 - Google Patents
情報記録媒体 Download PDFInfo
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- WO2004066292A1 WO2004066292A1 PCT/JP2004/000446 JP2004000446W WO2004066292A1 WO 2004066292 A1 WO2004066292 A1 WO 2004066292A1 JP 2004000446 W JP2004000446 W JP 2004000446W WO 2004066292 A1 WO2004066292 A1 WO 2004066292A1
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- 229950000688 phenothiazine Drugs 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 229960000969 phenyl salicylate Drugs 0.000 description 1
- RYSBYLUYRUYPNW-UHFFFAOYSA-N phenyl-(2-propoxyphenyl)methanone Chemical compound CCCOC1=CC=CC=C1C(=O)C1=CC=CC=C1 RYSBYLUYRUYPNW-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 150000007519 polyprotic acids Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- KRIOVPPHQSLHCZ-UHFFFAOYSA-N propiophenone Chemical class CCC(=O)C1=CC=CC=C1 KRIOVPPHQSLHCZ-UHFFFAOYSA-N 0.000 description 1
- 235000010388 propyl gallate Nutrition 0.000 description 1
- 235000011962 puddings Nutrition 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229960001860 salicylate Drugs 0.000 description 1
- WVYADZUPLLSGPU-UHFFFAOYSA-N salsalate Chemical compound OC(=O)C1=CC=CC=C1OC(=O)C1=CC=CC=C1O WVYADZUPLLSGPU-UHFFFAOYSA-N 0.000 description 1
- 229940116351 sebacate Drugs 0.000 description 1
- CXMXRPHRNRROMY-UHFFFAOYSA-L sebacate(2-) Chemical compound [O-]C(=O)CCCCCCCCC([O-])=O CXMXRPHRNRROMY-UHFFFAOYSA-L 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229940037312 stearamide Drugs 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- MUTNCGKQJGXKEM-UHFFFAOYSA-N tamibarotene Chemical compound C=1C=C2C(C)(C)CCC(C)(C)C2=CC=1NC(=O)C1=CC=C(C(O)=O)C=C1 MUTNCGKQJGXKEM-UHFFFAOYSA-N 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 239000001003 triarylmethane dye Substances 0.000 description 1
- 150000004072 triols Chemical class 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- NCYCYZXNIZJOKI-UHFFFAOYSA-N vitamin A aldehyde Natural products O=CC=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C NCYCYZXNIZJOKI-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- BOXSVZNGTQTENJ-UHFFFAOYSA-L zinc dibutyldithiocarbamate Chemical compound [Zn+2].CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC BOXSVZNGTQTENJ-UHFFFAOYSA-L 0.000 description 1
- 229940098697 zinc laurate Drugs 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
- GPYYEEJOMCKTPR-UHFFFAOYSA-L zinc;dodecanoate Chemical compound [Zn+2].CCCCCCCCCCCC([O-])=O.CCCCCCCCCCCC([O-])=O GPYYEEJOMCKTPR-UHFFFAOYSA-L 0.000 description 1
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
- B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
- B41M5/363—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a low molecular weight organic compound such as a fatty acid, e.g. for reversible recording
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/38—Visual features other than those contained in record tracks or represented by sprocket holes the visual signals being auxiliary signals
- G11B23/40—Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0037—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
-
- 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
- B41M2205/28—Storage stability; Improved self life
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
- G11B7/2467—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes azo-dyes
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
- G11B7/2534—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins polycarbonates [PC]
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/259—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on silver
Definitions
- the present invention relates to an information recording medium capable of recording visible information by heat or light. More specifically, the present invention relates to an information recording medium that can perform optical recording and reproduction of electronic information and record visible information by heating or light irradiation in an area other than the electronic information recording area.
- phase change type information recording media typified by CD-RW and DVD-RW
- organic dye-based information recording media typified by CDR and DVDR.
- the content of electronic information recorded on such an information recording medium can be confirmed by optically reproducing the information.
- a label printed with an ink jet printer or a thermal transfer pudding on the level surface of the medium, or a label with the information content recorded A method such as pasting is used. In any case, displaying the contents of electronic information as visible information on the media surface is important for information management.
- An object of the present invention is to provide a high-sensitivity visible information recording layer capable of recording at a relatively low temperature without thermally affecting an electronic information recording medium, and also having excellent display recording durability.
- An object of the present invention is to provide an information recording medium having an information recording layer.
- the present inventors have conducted intensive studies in order to obtain a visible information recording layer having both high sensitivity and high durability.As a result, it is necessary to disperse organic particles having predetermined physical properties in the visible information recording layer. Was found to be effective, leading to the present invention.
- the gist of the present invention is that, in an information recording medium having at least a visible information recording layer for recording visible information and a substrate, the visible information recording layer has a melting point of 50 or more and 180 or less. And organic particles having an average particle size of 0.5 zm or more and 2.0 or less, and can be recorded without substantial chemical change of the organic particles by heating or light irradiation. Exists in the information recording medium.
- the average particle size refers to a volume average particle size.
- the present invention by including organic particles having specific physical properties in the visible information recording layer, stable focus can be obtained by irradiation with a low-power laser, and visible information can be recorded with high sensitivity and clear visibility. Yes, and it also enables recording with excellent storage stability.
- the information recorded on the label surface can be displayed and recorded on the label surface using the same laser as the information recording laser after information recording. Convenience for consumers can be further improved.
- FIG. 1 is a sectional view showing an example of an embodiment of the information recording medium of the present invention.
- FIG. 2 is a schematic diagram showing a recording mechanism of the information recording device used in the example and the comparative example. Explanation of reference numerals
- visible information is information that is visually read, such as characters, symbols, images such as illustrations and photographs, and geometric patterns.
- Electrical information is recorded as digital signals. This means information that is read by any playback device, such as information that is present.
- the information recording medium of the present invention is an information recording medium having at least a visible information recording layer for recording visible information on a substrate and a label surface, wherein the visible information recording layer has a melting point of 50 or more and 180 or less. And organic particles having an average particle diameter of 0.5 m or more and 2.0 zm or less, and can be recorded without substantial chemical change of the organic particles by heating or light irradiation. It has high sensitivity that enables recording at a relatively low temperature, and also has excellent characteristics in display recording durability.
- the visible information recording layer in the information recording medium of the present invention is essential to contain dispersed organic particles.However, by dispersing the organic particles in the recording layer, the visible light rays are irregularly reflected, so that the translucent It is possible to form an opaque or moderately opaque recording layer. By heating the recording layer with a thermal head or irradiating a laser beam, the organic particles in the recording layer are melted and made transparent, that is, a substantial chemical change is caused. The visible information is recorded without the, and the recording part is formed. In this recording section, Since it is melted, is compatible with other components forming a layer described later, and is visually transparent, it is possible to visually identify the non-recording portion.
- the change in the transparency of the visible information recording layer before and after the recording of the visible information may be a change that can be visually confirmed, but preferably the transmittance changes by 5% or more. More preferably, it changes by 10% or more.
- the information recording medium of the present invention records visible information by melting organic particles as described above, the melting point of the particles directly affects the recording sensitivity.
- the melting point of the particles When recording visible information on the visible information recording layer on the label surface using a thermal head or laser light, recording at a high temperature requires heat applied to the electronic information recording layer on the opposite side. This has an unfavorable effect, and the melting point of the particles must be less than 180 DC. On the other hand, the melting point of the particles must be 50 ° C or higher because it is not preferable that the recorded contents are easily erased by moisture absorption or heat in a normal use environment.
- the melting point of the particles is preferably 100 ° C or higher, and when high sensitivity recording characteristics are required.
- the melting point of the particles is selected within the range of 100 ° C. or less.
- the average particle size of the organic particles used in the present invention is 0.5 ⁇ or more and 2.0 / m or less. If it is less than 0.5 m, it becomes transparent to visible wavelength light, and the ratio of fine particles with a particle size of about 0.2 m or less increases, so the transparency of the recording layer before recording increases, The contrast before and after recording is reduced, and visibility is reduced. If it exceeds 2.0 m, the particles are less likely to melt, and the recording sensitivity due to heat or light decreases.
- organic particles having an average particle size of 0.5 / m or more and 2.0 m or more in the recording layer, preferably 25% or more, Preferably, the content is 30% or more, preferably 70% or less, more preferably 65% or less.
- the minimum particle size of the organic particles used in the present invention is 0.1 m or more, preferably 0.1 im or more.
- the maximum particle size is 20 im or less, preferably 10 im or less.
- the organic particles can be melted by a thermal head laser beam, so that visible information can be recorded on the recording layer.
- the visible information recording section of the present invention is superior in durability as compared with the conventional visible information recording method.
- a recording layer for recording visible information with a thermal head or a laser beam has, for example, a composition containing a dye and a coloring aid of the dye in order to color the recording portion. Therefore, for example, when the recording layer is exposed to a high-temperature environment in which the recording layer absorbs moisture or is continuously used in a recording / reproducing apparatus for electronic information, the dye and the coloring aid gradually act, There is a problem that the unrecorded area develops color or the recorded area develops color.
- Another conventional example is a type of medium in which the crystalline state of a fatty acid ester or the like contained in the visible information recording layer is reversibly changed, and recording is performed using the difference in the amount of diffusely reflected light between the crystalline state and the amorphous state.
- the organic particles are melted and recorded at a temperature higher than the melting point, if they are not heated to a temperature higher than the melting point after the recording, they gradually react and react. The ratio does not decrease, and visible information with excellent durability can be obtained.
- the information recording medium of the present invention may have at least a substrate and a visible information recording layer, and can be applied to any base material and any medium. In an information recording medium provided with, the effect is most effectively exhibited.
- the information recording medium of the present invention will be described by taking an information recording medium having an electronic information recording layer (area) and a visible information recording layer (area) as an example.
- the visible information recording area is provided in a portion other than the recording area of the optically recorded electronic information.
- both areas may be provided in the same plane, or an electronic information recording area and a visible information recording area may be provided in different layers.
- the electronic information recording area and the visible information recording area may be provided on the same side of the substrate, or may be provided on opposite sides.
- the information recording medium of the present invention has a substrate, an electronic information recording layer, a reflective layer, and a visible information recording layer as a normal basic configuration, and it is preferable that these layers are laminated in the above order. It is more preferable to have a protective layer between the layer and the visible information recording layer.
- the protective layer is a layer that is useful for protecting the reflective layer, which is usually formed of a metal or an alloy, from humidity and the like.
- the reflective layer is usually formed by a wet film forming method. By separating the reflective layer from the visible information recording layer, deterioration of the reflective layer can be prevented.
- an overcoat layer is provided on the surface of the visible information recording layer (the surface to which heat for recording is applied or light is irradiated).
- the overcoat layer is a layer that serves to protect the medium from physical abrasion and excessive pressure and, when the recording layer is recorded by light irradiation, also serves to focus the recording light. is there.
- FIG. 1 is a cross-sectional view of an example of the information recording medium having the above-described layer configuration.
- the information recording medium 10 including the layers from the substrate 1 to the protective layer 4 shows a normal CD-R.
- a coloring layer or a reflection layer below the visible information recording layer.
- a reflective layer below the visible information recording layer.
- the force of the recording light usually the recording laser light
- an arbitrary transparent layer may be provided between the coloring layer and the reflective layer and the visible information recording layer.
- a colored layer or a reflective layer is provided on the surface of the visible information recording layer opposite to the light incident surface or the heat application surface for recording the visible information.
- the protective layer 4 itself may be colored, or a colored layer may be provided between the protective layer 4 and the visible information recording layer 5.
- a reflective layer may be provided between the protective layer 4 and the visible information recording layer 5 (separately from the reflective layer 3), or the protective layer 4 may be made of a transparent material.
- the reflective layer 3 is effective for both the electronic information recording layer and the visible information recording layer. Since the visible information is recorded by making the recorded portion transparent, it is preferable that the colored layer and the reflective layer, which are the base, be clearly seen because visibility and design are enhanced.
- the colored layer of the present invention is not particularly limited as long as it is a colored layer.
- it can be formed by applying and curing an ultraviolet curable resin containing a dye or a pigment.
- the visible information recording layer in the information recording medium of the present invention contains dispersed organic particles, and is preferably formed using a binder resin in which the particles are dispersed.
- a recording layer for recording visible information by light irradiation it is preferable to contain a photothermal conversion agent.
- it may contain a dispersant and any additives.
- organic particles having a melting point of 50 to 180 described below, a binder resin, and a light-to-heat conversion agent and Z or other additives added as necessary are dispersed in an appropriate poor solvent.
- the layer containing organic particles can be formed by applying the coating solution prepared as described above.
- the organic particles used in the present invention basically satisfy the requirements of a melting point of 50 ° C. or more and 180 or less and have an average particle diameter of 0.5 m or more and 2.0 im or less. I just need to.
- Organic particles having a melting point of 50 ° C or higher and 180 ° C or lower include low aliphatic compounds and aromatics. It is appropriately selected from molecular compounds and the like. Specifically, a low molecular weight aromatic compound having a weight average molecular weight of about 90 or more and about 1500 or less, an aliphatic compound having a weight average molecular weight of about 90 or more and about 2000 or less, waxes, pigments, etc. Among them, a compound having a low melting point of about 50 ° C. or more and about 100 ° C. or less and a large contrast after melting white is preferable.
- low molecular weight aromatic compounds examples include butyl gallate, n-propyl gallate, isoamyl gallate, lauryl gallate, n-butyl p-hydroxybenzoate, 5-sulfosalicylic acid, benzyl para-hydroxybenzoate, Examples thereof include aromatic carboxylic acids such as methyl 5-dihydroxybenzoate and esters thereof.
- Other examples include phenols such as bisphenol 8, 4-hydroxyphenyl (4'-n-propoxyphenyl) sulfone, and 2-2'-methylenebis 11- (4-ethyl-6-t-butylphenol). No.
- Examples of the aliphatic compound include metal soaps such as sodium lauryl sulfate, zinc stearate, calcium stearate, magnesium stearate, calcium laurate, zinc laurate, and barium ricinoleate.
- waxes examples include 1,2-di (3-methylphenoxy) ethane, 1,2-diphenoxetane, p-benzylbiphenyl, 21-naphthylbenzyl ether, benzyl-4-methylthiophene ether, Dibenzyl oxalate, di-oxa-p-methylbenzyl ester, di-p-oxa-benzyl oxalate, dibutyl terephthalate, dibenzyl terephthalate, stearamide, methylenebisstearic amide Benzyl p-benzyloxybenzoate, p-tolylbiphenyl ether, di (p-methoxyphenoxethyl) ether, 1,2-di (4-methylphenoxy) ethane, 1,2-di (4-chlorophenyl) Enoxy) ethane, 1,2-diphenoxetane, 1-1 (4-methylphenoxy) 1-2 (3-methylphen
- the dye examples include a colorless leuco dye.
- a colorless leuco dye Specifically, for example, triphenylmethane, triphenylmethane-phthalide, fluoran, phenothiazine, leuco-lamine, indoline, indolinophthalide, diphenylmethane, spiropyran, indigo, etc.
- the phthalide compound is preferable.
- those having a melting point of 50 ° C. or more and a temperature of 180 or less are selected.
- a dye may be used as the organic particles, but in the information recording medium of the present invention, as described above, the organic particles in the visible information recording layer are transparentized by melting to form a recording portion, and the visible information recording layer is formed. Since the difference is visible between the transparent part (recording part) and the translucent or opaque part (non-recording part) of the layer, the object can be achieved without using a dye.
- the melting point of the organic particles is 50 ° C. or higher and 180 ° or lower. If the melting point is less than 50 ° C, the recorded contents are easily lost due to moisture absorption or heat in a normal use environment, and the durability is inferior. On the other hand, if the temperature exceeds 180 and the temperature is too high, recording is performed at a high temperature. This is not preferable because the electronic information recording layer on the opposite side may be affected by heat.
- the melting point is preferably at least 80 ° C and no more than 170 ° C.
- the melting point of the organic particles used is different depending on the recording method such as heating or light irradiation on the visible information recording layer, but if heat resistance is required, the melting point of the particles is preferably 100 ° C. or more, When high sensitivity recording characteristics are required, the melting point of the particles is preferably selected within the range of 100 ° C or less.
- the content of the organic particles in the visible information recording layer is preferably 25% by weight or more, more preferably 30% by weight or more, preferably 70% by weight or less, more preferably It is about 65% by weight or less.
- the visible information recording layer contains the organic material particles in the visible information recording layer in a state of being dispersed in the binder resin as described later.
- the binder resin used for forming the visible information recording layer a resin capable of dispersing organic particles satisfactorily and having high compatibility with molten organic particles is preferable.
- binder resin examples include vinyl chloride, polyvinyl chloride, vinyl acetate-vinyl acetate maleic acid copolymer, vinyl chloride-vinyl acetate-acrylic acid copolymer, and vinyl chloride-vinyl acetate-alcohol copolymer.
- a radiation curable resin such as an electron beam or an ultraviolet ray
- the elastic modulus in a high temperature region is increased, and the durability can be improved.
- a polyfunctional acrylate monomer having excellent curability such as tetraethylene dalicol diacrylate and trimethylolpropane triacrylate can be favorably used.
- an ultraviolet curable resin an appropriate amount of a benzoin-based, acetophenone-based, thioxanthone-based, or peroxide-based photopolymerization initiator is added for curing polymerization.
- thermo-crosslinkable resin is not more than 70% by weight, preferably not more than 50% by weight, based on the weight of the binder resin.
- the method of thermal crosslinking is not particularly limited.
- the coating may be performed by heating or the like when applying a coating solution prepared together with a binder resin or the like.
- Examples of the resin that undergoes thermal crosslinking include polyester resins, polyurethane resins, acrylic resins, polyamide resins, and the like, which have a functional group such as a hydroxyl group or a hydroxyl group.
- these resins are not crosslinked, the visible information recording layer is softened or melted by instantaneous heating during printing with laser light, causing distortion in each layer of the medium. There is ⁇ that causes deformation.
- the elastic modulus at high temperatures can be improved and deformation can be suppressed, so that destruction and deformation of each layer is small even by instantaneous heating during laser beam printing, It is possible to obtain an information recording medium having excellent durability.
- isocyanate compound examples include polyisocyanate compounds having a large number of isocyanate groups, and specifically, hexamethylene diisocyanate, toluene diisocyanate, xylylene diisocyanate, and trimethylol of these polyisocyanate compounds. Adduct type, puret type or trimmer type by propane etc. can be adopted.
- the binder resin and the thermally crosslinkable resin may be appropriately selected in consideration of the material of the organic particles and the properties of each resin.
- the visible information recording layer in the present invention is a layer that can be recorded by light irradiation or heating.However, in the case of recording by light irradiation, the irradiated light is converted into heat, and the organic particles are melted. It is preferable to contain an agent.
- the photothermal conversion agent may be any compound that absorbs visible information recording light and converts it into heat energy, and is appropriately selected according to the wavelength of the recording light. For example, if visible information is recorded with light having a wavelength of about 700 to 900 nm, an infrared absorbing dye can be used. If recording is performed with light having a shorter wavelength, a compound having a large absorption at the wavelength of the recording light and a high conversion efficiency to heat energy may be selected.
- Examples of the compound used as the photothermal conversion agent include triaryl methane dyes, azo dyes, cyanine dyes, squarylium dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, naphthalocyanine dyes, and naphthoquinone dyes.
- color And organic dyes such as porphyrin dyes, indigo dyes, dithiol complex dyes, azurenium dyes, quinonimine dyes, and quinonedimine dyes.
- the reflectance of the coated surface is preferably 50% or less, particularly preferably 50% or less, in one wavelength region of the laser used. If it is contained so as to be 30% or less, the specific content is 0.1% by weight or more, preferably 0.1% by weight or more, 10% by weight or less, preferably 5% by weight or less. % By weight or less.
- the maximum wavelength in the above-described organic dye is within the wavelength range.
- Compounds represented by the following general formula (I) are particularly preferred from the viewpoint that they have an absorption wavelength and have little absorption in the visible light wavelength region, so that the visibility of recorded visible information is good. preferable.
- rings A, B, C, D, and E may have any substituents, and a ring is further fused to any of rings A, B, C, D, and E. It may be.
- X and Y each independently represent an oxygen atom, a sulfur atom, a cyanomethylene group represented by the following formula,
- Ring A in the above general formula [I] , B, C, D and E may have, for example, an alkyl group, an octaalkyl group, an alkoxy group, an alkoxyalkoxy group, a halogen atom, a hydroxyl group, a propyloxyl group or a carbonyl group.
- the alkyl group in the alkyl group, the alkoxy group and the alkoxyalkoxy group usually has 1 to 8 carbon atoms, and may be linear or cyclic, and may be linear or branched. May be.
- rings A, B, C, D and E the rings may be further fused.
- the ring to be condensed is preferably an aromatic ring, especially an aromatic hydrocarbon ring such as a phenyl group.
- the compound represented by the general formula [I] has a weight average molecular weight of 600 or more and 2000 or less.
- X and Y are each independently an oxygen atom, a sulfur atom, a cyanomethylene group represented by the above formula, or N--C ⁇ N (however, X and Y are not oxygen atoms at the same time.
- R and R ′′ each independently represent a hydrogen atom or an arbitrary substituent, and each is more preferably a hydrogen atom or a linear or branched alkyl group (having 1 carbon atom). 5).
- X and Y are particularly preferably disyanomethylene groups of the following formulas. zCN
- Z and Z ' are preferably an oxygen atom or a sulfur atom.
- the compound represented by the general formula [I] preferably includes a compound represented by the following general formula [II].
- Ri to Rs in the general formula (II) are each independently a hydrogen atom or any substituent having the same meaning as any substituent that the rings A, B, C, D and E in the general formula (I) may have. You. Specific examples of these optional substituents include the same types as the substituents described in the above general formula (I). Preferred substituents and more preferred substituents also include the aforementioned substituents. Can be
- R 9 and each independently represent a hydrogen atom or an arbitrary substituent having the same meaning as that in formula (I), preferably a halogen atom or a linear or branched alkyl group (having a carbon number of 1 to 5).
- the light-to-heat conversion agents including the compound represented by the general formula [I] may be used alone or in combination of two or more.
- the visible information recording layer according to the invention may contain various additives other than those described above and a dispersant for uniformly dispersing the organic particles, as long as the performance is not impaired.
- a dispersant for uniformly dispersing the organic particles for example, to improve the light resistance of the visible information recording layer, it is preferable to use a light stabilizer.
- Light stabilizers include ultraviolet absorbers, antioxidants, antioxidants, quencher of singlet oxygen, and the like.
- Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, and 4-dodecyloxy-2-hydroxybenzophene.
- Non, 2,2'-dihydroxy-l-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-l, 4,4'-dimethoxybenzophenone, 2,2 ', 1,4'-tetrahydroxybenzophene Non, 2-hydroxy-4-methoxy-1 2'-carboxybenzophenone, 2-hydroxy-4-oxybenzylbenzophenone, 2-hydroxy-1-benzobenzophenone, 2-hydroxy-15-chlorobenzene Nzophenone, 2-hydroxy-4-methoxy-14'-methylbenzophenone, 2-hydroxy-41-n-heptoxybenzophenone, 2-hydro 1,3-dichloro-1-methoxybenzophenone, 2-hydroxy-1,3-dichloro-1-ethoxy
- ultraviolet absorbers include, for example, 2- (2'-hydroxy-5, -methylphenyl) benzotriazole, 2- (2, -hydroxy-3,5'-ditertiary-butylphenyl) benzotriazole, 2- (2, -hydroxy-3'-tert-butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-4'-octoxy) benzotriazole, 2- (2'-hydroxy-1 3 ', 5 '-Dibutyltriphenylphenyl) 5-benzotriazole, 2-(3' tert-butyl-2 '-hydroxy-5'-methylphenyl) 5-benzotriazole, 2-(2'-Hydroxy-5-ethoxyphenyl) benzotriazol and other benzotriazole-based ultraviolet absorbers; phenylsalicylate, p-octylphenyl Salicyl phenyl ester UV absorbers such as lusalicylate, p-butyl
- antioxidants and antioxidants examples include 2,6-di-tert-butyl-4-methyl phenol, 2,4,6-tri-butyl-phenyl phenol, styrenated phenol, 2,2′-methylene bis (4- Methyl 6-N-shallow butylphenol), 4,4'-Isopropylidenebisphenol, 2,6-bis (2,1-hydroxy-3'-tert-butyl-5,1-methylpentyl) 14 —Methylphenol, 4, 4 '—Chobis— (3-methyl-6-tert-butylphenol), tetrakisux ⁇ Methylene (3,5-di-u-nichi-shary-butyl-4-hydroxyhydrocinnamate) ⁇ Methane, p-hydroxyphenyl-l-naphthylamine, 2,2,4-trimethyl-1,2-dihydroquinoline, thiobis-naphthol ), Mercaptobenzothiazole, mercap
- Quenchers of singlet oxygen include, for example, carotenes, pigments, amines, phenols, nickel complexes, sulfides, etc., for example, 1,4-diazabicyclo (2,2,2 ) Saitantan, carotene, 1,3-cyclohexadiene, 2-ethylaminomethylfuran, 2-phenylaminomethylfuran, 9-ethylaminomethylanthracene, 5-ethylaminomethyl-6-phenyl 3,4-dihydroxypyran, nickel dimethyldithiol rubamate, nickel dibutyldithiocarbamate, nickel 3,5-di-t-butyl 4-hydroxybenzyl-o-ethylphosphonate, nickel 3,5-di- t-butyl- 4-hydroxybenzyl-o-butylphosphonate, nickel ⁇ 2,2'-thiobis (4-t-octylphenol) ) ⁇ (N-butylylamine), nickel
- components other than the above may be contained. These optional components may be used alone or in combination of two or more.
- additives and dispersants are 20% by weight or less in total, preferably 10% by weight or less, based on the coating solution.
- the visible information recording layer is formed by preparing a recording layer coating liquid using the above-mentioned visible information recording layer forming material, and applying and drying the coating liquid on a region where the visible information recording layer is to be provided.
- the preparation of the coating solution for the visible information recording layer is not particularly limited as long as the organic particles, the binder resin, and various optional additives are uniformly dispersed in an appropriate organic solvent that dissolves the binder resin. For example, only organic particles are uniformly dispersed in an organic solvent and then prepared by uniformly mixing the binder resin, or the organic particles are uniformly mixed and dispersed in a binder resin solution in which the binder resin is dissolved in the organic solvent.
- any method may be used, such as preparation or preparation by uniformly dispersing organic particles together with a pinda resin in an organic solvent.
- the organic solvent for dissolving the pinda resin include ethers such as dibutyl ether, isopropyl ether, dioxane, and tetrahydrofuran; ketones such as acetone, getyl ketone, methyl ethyl ketone, methyl isobutyl ketone, and methyl propyl ketone; Esters such as isopropyl acetate, n-propyl acetate, and n-butyl acetate; and aromatic hydrocarbons such as benzene, toluene, and xylene. These may be used alone or as a mixture.
- a known wet thin film forming method can be applied, preferably a spin coating method or a screen printing method, and more preferably a spin coating method.
- the thickness of the visible information recording layer is usually at least 100 nm, preferably at least 50 nm, and usually at most 500 nm, preferably at most 300 nm.
- the organic particles may be contained in the same layer, or a light-to-heat conversion layer containing a light-to-heat conversion agent may be provided in contact with the visible information recording layer.
- the light-to-heat conversion layer may be provided in contact with either surface of the visible information recording layer, but when it is provided on the recording light incident side, it is preferably transparent in the visible light wavelength region. Those having an absorbance of 5% or less in the region are preferred.
- an overcoat layer is provided on the visible information recording layer using an ultraviolet curable resin.
- the overcoat layer is provided for the purpose of protecting the visible information recording layer from physical abrasion, excessive pressure, atmospheric humidity, and the like.
- this layer is also useful for focusing recording light.
- the overcoat layer is preferably transparent at the wavelength of the recording light, and for example, preferably has an absorbance of 5% or less at the wavelength. In order to focus the recording light (concentrate light efficiently), it is preferable that the recording light has a certain thickness of 10 / zm or more.
- the overcoat layer is not necessarily required to be transparent, and it is sufficient that the recording layer is transparent or translucent so that it can be seen through.
- the overcoat layer is transparent in the visible light wavelength region. Specifically, for example, those having an absorbance in the wavelength region of 5% or less are preferable.
- the absorbance of the overcoat layer at the wavelength of the recording light is preferably as small as possible, for example, preferably 5% or less.
- the UV-curable resin for forming the overcoat layer is not particularly limited as long as it satisfies the above conditions, and is, for example, an acryl-based resin such as urethane acrylate, epoxy acrylate, or ester acrylate. Is mentioned.
- acrylate oligomer 20 to 80% by weight of the following acrylate oligomer is added to the following acrylate:
- An ultraviolet curable resin composed of 10 to 70% by weight of a ril type monomer and 1 to 10% by weight of a photo-radical initiator (3) below is preferred.
- Epoxy acrylate oligomers obtained by reacting (meth) acrylic acid with an epoxy resin made from bisphenol, F, S, nopolak, or the like;
- Reaction product of polyurethane consisting of hexamethylene diisocyanate and 1,6-hexanediol with 2-hydroxyethyl acrylate, polyesterdiol consisting of adipic acid and 1,6-hexanediol and tolylenediene (Di) isocyanate compounds, polyhydric alcohols, and (meth) acrylic acid react, such as those obtained by reacting 2-hydroxyethyl acrylate with diisocyanate oligomer reacted with isocyanate.
- Urethane acrylate oligomer
- Esters of polyester diol and acrylic acid which are composed of a ring-opening polymer of phthalic anhydride and propylene oxide; esters of acrylic acid, polyester diol of adipic acid and 1,6-hexanediol; and trimellitic acid Polyhydric alcohols, polybasic acids or their anhydrides, and (meth) acrylic acid, such as esters of acrylic acid and triols formed by reacting with diethylene glycol, and esters of ring-opening polymers of ⁇ -valerolactone with acrylic acid Ester acrylate oligomer obtained by reaction of an acid;
- Ether acrylate oligomers obtained by reacting (meth) acrylic acid with polyhydric alcohols, polyethylene glycols, polypropylene glycols, etc. obtained by adding ethylene oxide / propylene oxide to a hydroxyl group-containing compound.
- Acetophenone compounds propiophenone compounds, anthraquinone compounds, thioxanthonone compounds and the like.
- a coloring material such as silica, a pigment, a dye, a polymerization terminator, a storage stabilizer, a dispersant, a defoamer, Contains surfactants, pinner resins other than UV-curable resins, etc. It may be.
- the hardness of the overcoat layer varies depending on the type and content ratio of monomers and oligomers contained in the ultraviolet-curable resin used for forming the layer, the content of optional components such as a binder resin, and the like.
- the hardness tends to be lower when the monofunctional monomer is contained in a relatively large amount than the functional monomer, and when the polyacrylate monomer is contained in a large amount, the hardness tends to be low.
- the overcoat layer is formed by a method such as spin coating, dip coating, vacuum coating, blade coating, air knife coating, roll coating, or screen printing.
- spin coating is preferred from the viewpoints of high productivity and surface smoothness of the obtained overcoat layer.
- the amount of irradiation energy is generally 150 ⁇ 2000mJZcm2, it is preferably selected from the range of 250 ⁇ 100 OmJ / cm 2. At this time, the coating film is hardened in a few seconds, so that the productivity is excellent.
- the thickness of the overcoat layer is preferably about 1.0 to 100 tm, but the thickness is appropriately adjusted according to the method of recording visible information. From the viewpoint of protection of the visible information recording layer, it is usually at least 1.0 m, preferably at least 3.0 m, and usually at most 15 m, preferably at most 10 m.
- the recording light has a certain thickness for focusing, specifically, 10 m or more, and more preferably 20 m.
- the upper limit of the thickness is usually about 100 m, which is more preferable. Or about 80 m. If the thickness of the overcoat layer is less than 10 m, the effect of stabilizing the focus of the recording light may be insufficient, and the recording may not be performed stably. If the thickness of the layer is larger than 100 m, the medium may be warped due to the curing shrinkage of the coating film, or the medium may be warped due to a difference in moisture absorption between the overcoat layer and a substrate material described later. The influence may increase, and it may not be possible to obtain a stable warped information recording medium.
- the refractive index of the layer should be 0.4 or more and 2.6 or less, particularly 0.5 or more and 1.9 or more. The following is preferred.
- FIG. 1 is a cross-sectional view showing an example of an embodiment of an information recording medium of the present invention.
- an electronic information recording layer 2, a reflective layer 3, and a protective layer 4 are provided on a substrate 1,
- the visible information recording layer 5 and the overcoat layer 6 are formed thereon.
- the optical information recording medium 10 composed of the substrate 1 to the protective layer 4 shows a normal CD-R.
- the material constituting the substrate 1 is basically required to be transparent to the wavelengths of the recording light and the reproduction light.
- a material include a polycarbonate resin, an acryl resin, and a methacryl resin.
- Inorganic materials such as glass are used in addition to polymer materials such as resin, polystyrene resin, vinyl chloride resin, epoxy resin, polyester resin, and amorphous polyolefin resin.
- polycarbonate resins are preferable because they are excellent in that they have high light transmittance, low optical anisotropy, and high strength.
- Amorphous polyolefin is preferred in terms of chemical resistance, moisture absorption resistance, optical properties, and the like.
- a guide groove / pit for recording / reproducing may be provided on the surface of the substrate 1 in contact with the electronic information recording layer 2.
- Such guide grooves and pits are preferably provided when the substrate 1 is formed, but may be provided on the substrate 1 using an ultraviolet (UV) curable resin.
- the lower limit of the thickness of the substrate 1 is usually 1.1 mm, preferably 1.15 mm, and the upper limit is usually 1.3 mm, preferably 1.25 mm.
- the electronic information recording layer 2 may be formed directly on the substrate 1 or may be formed via an optional layer as needed.
- the electronic information recording layer 2 is not particularly limited as long as it can be recorded by irradiation with a laser beam, and may be any of an electronic information recording layer made of an organic substance and an electronic information recording layer made of an inorganic substance.
- Organic dyes are mainly used for the electronic information recording layer made of an organic substance.
- organic dyes include macrocyclic azananulene dyes (phthalocyanine dyes, naphthalocyanine dyes, porphyrin dyes, etc.), polymethine dyes (cyanine dyes, merocyanine dyes, squarylium dyes, etc.), anthraquinone dyes, azurenium dyes, and the like.
- Azo dyes metal-containing azo dyes, metal-containing indoor diphosphorus dyes, and the like.
- metal-containing azo dyes, cyanine dyes and phthalocyanine dyes are preferred.
- metal-containing azo dyes are preferable because of their excellent durability and light resistance.
- the method for forming the electronic information recording layer 2 made of an organic substance includes a dry thin film forming method such as a vacuum evaporation method and a sputtering method, and a wet thin film forming method generally used such as a casting method, a spin coating method, and an immersion method.
- the spin coating method is particularly preferable in terms of mass productivity and cost.
- a rare earth transition metal alloy such as Tb, Te, CoDy, Fe, and Co for recording by the magneto-optical effect is used.
- chalcogen-based alloys such as Ge′Te and Ge ⁇ Sb ⁇ Te that change in phase may be used. These layers may be a single layer or may be composed of two or more layers.
- Examples of a method for forming the electronic information recording layer 2 made of an inorganic material include a vapor deposition method, an ion plating method, and a sputtering method, but from the viewpoint of mass productivity and cost, sputtering is performed. Is particularly preferred.
- the thickness of the electronic information recording layer 2 varies depending on the type of the recording layer, but the lower limit is usually 5 nm, preferably 10 nm, and the upper limit is usually 500 nm, preferably 300 nm. .
- the reflective layer 3 is provided on the electronic information recording layer 2.
- the reflective layer 3 is made of a material having a sufficiently high reflectance at the wavelength of the reproduction light, for example, Au, Al, Ag, Cu, Metals such as Ti, Cr, Ni, Pt, Ta, and Pd can be used alone or as an alloy.
- Au, Al and Ag have high reflectivity and are suitable as the material of the reflective layer.
- those containing Ag as a main component are particularly preferable because of their low cost and high reflectivity.
- Examples of a method for forming the reflective layer 3 include a vapor deposition method, an ion plating method, and a sputtering method, and the sputtering method is particularly preferable in terms of mass productivity and cost.
- the lower limit of the thickness of the reflective layer 3 is usually 30 nm, preferably 50 nm, and the upper limit is usually 150 nm, preferably 120 nm.
- a protective layer 4 is provided on the (upper surface).
- the protective layer 4 exists between the reflective layer 3 and the visible information recording layer 5. Therefore, in the case where visible information is recorded by light irradiation, the protective layer 4 is preferably made of a laser-transparent substance.
- the laser light transmitting material forming the protective layer there is no particular limitation on the laser light transmitting material forming the protective layer, and any material may be used as long as it is a laser light transmitting material.
- an ultraviolet (UV) curable resin is often used as a protective layer of an information recording medium, but most of these resins are laser light transmitting materials and are therefore suitable for the present invention.
- the UV curable resin acrylate resins such as urethane acrylate, epoxy acrylate and polyester acrylate can be used. Materials similar to those used for forming the overcoat layer can be appropriately selected and used. One of these UV-curable resins may be used alone, or two or more of them may be used in combination.
- the protective layer 4 may be a single-layer film or a multilayer film having two or more layers.
- the protective layer 4 made of a UV curable resin is prepared by coating the UV curable resin as it is or by dissolving it in an appropriate solvent to prepare a coating solution, and then applying the coating solution onto the reflective layer 3 and irradiating with UV light. It can be formed by curing. In this case, a spin coating method, a casting method, or the like can be adopted as a coating method.
- the protective layer can also be formed by a printing method such as a screen printing method, and is formed by a method appropriately selected according to a material to be used. Among them, a spin coating method is particularly preferable, and a spin coating method is generally used.
- the lower limit of the thickness of the protective layer 4 is usually 1.0 // m, preferably 3.0 m, and the upper limit is usually 15 m, preferably 10 m.
- a visible information recording layer 5 containing organic particles and an overcoat layer 6 made of an ultraviolet curable resin are usually provided on the protective layer 4 by the above-described method.
- FIG. 1 shows an example of an embodiment of the information recording medium of the present invention.
- the information recording medium of the present invention is not limited to the layered structure shown in FIG.
- a coloring layer or a reflection layer is provided below the visible information recording layer.
- a colored layer or a reflective layer is provided on the visible information recording layer 5 on the side opposite to the light incident surface or the heat application surface for visible information recording.
- the protective layer 4 itself may be colored to form a colored layer, or a colored layer may be separately provided between the protective layer 4 and the visible information recording layer 5. .
- the coloring layer is made of a laser-transmissive material such as a UV curable resin, like the protective layer.
- the layer can be formed by coloring to a desired color with a coloring agent such as a dye. Visible information is recorded by making the recorded part transparent, so by providing a colored layer, the colored layer, which is the base of the recorded part, can be seen clearly, and visibility and design can be improved. Is preferred.
- the visible information recording by light irradiation can be performed. Focusing can be performed stably using reflected light, which is preferable.
- a reflective layer for example, in the configuration of FIG. 1, a reflective layer (in addition to the reflective layer 3) may be provided between the protective layer 4 and the visible information recording layer 5, or the protective layer 4 may be transparent.
- the reflective layer 3 can function for both the electronic information recording layer and the visible information recording layer, but the configuration of the optical information recording medium is simplified and the manufacturing cost is reduced. In doing so, it is preferable that this reflective layer is a reflective layer for both the visible information recording layer and the electronic information recording layer.
- the electronic information recording layer of the information recording medium of the present invention may be a phase-change type recording layer capable of recording and erasing Z, and the protective layer between the visible information recording layer 5 and the reflective layer 3 is exposed to laser light.
- the protective layer between the visible information recording layer 5 and the reflective layer 3 is exposed to laser light.
- two or more layers may be used or no layer may be used.
- the visible information recording layer 5 may be formed directly on the outermost surface layer (protective layer 4) of an optical information recording medium such as a CD-R.
- the visible information recording layer 5 may be formed via a transparent layer.
- the present invention is not limited to the optical information recording medium having the above-described configuration such as the CD-R, but can be variously modified.
- the optical information recording medium may have a plurality of electronic recording layers.
- a substrate having a guide groove and / or pit having a thickness of about 0.6 mm first substrate
- a so-called dummy substrate having no guide groove and / or pit second substrate
- the present invention can be applied to a layered structure.
- other layers may be provided as necessary between each layer and the outermost layer.
- the present invention is not limited to the so-called substrate-surface incident type optical information recording medium, and may be a so-called film-surface incident type optical recording medium which records and reproduces information by irradiating a laser beam from the protective layer side (that is, the film surface side).
- the present invention can be applied to a laminated structure including an overcoat layer, a Z visible information recording layer, a Z substrate, a Z reflection layer / an electronic information recording layer, and a Z protection layer.
- other layers may be provided as needed between each layer or as the outermost layer.
- the visible information recording area provided on the information recording medium of the present invention may be, for example, the entire one side of the disc-shaped information recording medium or a part of the one side, and may be provided on both sides. It may be.
- the visible information recording layer in the information recording medium of the present invention can be recorded in a non-contact manner, the visible information recording layer is hardly affected by the pressure applied to the electronic information recording layer, and the finer recording becomes possible. More preferably, information can be recorded.
- the device shown in FIG. 2 is a device in which visible information can be recorded on an optical disk having a visible information recording layer by a normal optical disk drive.
- the optical disk 11 is mounted on a spindle 12 and a spindle motor is mounted. Rotate with 1 3 and rotate the screw shaft 15 with the 1-14 stepping motor for feed feed, and move the pickup 16 to any position. Let it.
- the laser power is controlled by the front monitor so that it can be written with an appropriate power.
- the write signal irradiates a pulse of about 50% duty with a power of 40 to 5 OmW on the disk surface.
- the spindle speed is 160-2560 rpm.
- a 1.2 mm thick polycarbonate substrate having a group of 0.45 m width and 155 nm depth was obtained by injection molding.
- a fluorine-containing alcohol solution of a gold-containing azo dye was applied by spin coating, and dried at 90 for 15 minutes to form an electronic information recording layer 2 having a thickness of 100 nm.
- Ag was sputtered on the electronic information recording layer 2 to form a reflective layer 3 having a thickness of 70 nm.
- An ultraviolet-curable resin (“DA-Nippon Ink Co., Ltd.” SD-374) mainly composed of an acrylate monomer is applied on the reflective layer 3 by spin coating, and then cured by irradiation with ultraviolet light. Was formed.
- a toluene solution (a coating solution for forming a visible information recording layer) comprising the components shown in Table 1 below was prepared as a visible information recording layer.
- This coating solution was applied by a spin coating method and dried at 50 for 30 minutes to form a visible information recording layer 5 having a thickness of about 2 ⁇ m.
- the particle size distribution of 2,4-dihydroxybenzoic acid in the obtained dispersion was measured using Microtrac 9340UPA (manufactured by Nikkiso Co., Ltd.). The average particle size was 1.5 m.
- an ultraviolet-curable resin (“SD-374” manufactured by Dainippon Ink and Chemicals, Inc.) mainly composed of the same acrylate monomer as used for forming the protective layer 4 was used.
- a 5 O mW laser is applied to the overcoat layer forming surface (label surface) to record characters (visible information) on the information recording medium created by such a method.
- a 5 O mW laser is applied to the overcoat layer forming surface (label surface) to record characters (visible information) on the information recording medium created by such a method.
- the evaluation of recording visibility indicates the following criteria.
- the recording part can be clearly recognized.
- Good The recording unit can be recognized.
- An information recording medium was prepared in the same manner as in Example 1 except that the type of organic particles and the amount of the organic particles in the visible information recording layer of Example 1 were changed as shown in Table 2 below. Recording was performed on the label surface of the information recording layer. .
- Example 2 to 4 and Comparative Examples 1 to 3 the average particle diameter of the dispersion of organic particles was measured in the same manner as in Example 1.
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Abstract
Description
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EP04703925A EP1587091A4 (en) | 2003-01-24 | 2004-01-21 | INFORMATION RECORDING MEDIUM |
US10/947,270 US20050036768A1 (en) | 2003-01-24 | 2004-09-23 | Information recording medium |
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WO2004064052A1 (ja) * | 2003-01-08 | 2004-07-29 | Mitsubishi Chemical Corporation | 光情報記録媒体及び光情報記録媒体の製造方法 |
JP4783296B2 (ja) * | 2004-10-15 | 2011-09-28 | 三菱レイヨン株式会社 | 活性エネルギー線硬化性樹脂組成物およびシート状光学物品 |
JP2006260728A (ja) * | 2005-03-18 | 2006-09-28 | Fuji Photo Film Co Ltd | 光ディスク |
US20070047420A1 (en) * | 2005-08-25 | 2007-03-01 | Fuji Photo Film Co., Ltd. | Optical information recording medium, optical information recording method and optical information reproducing method |
US7678438B2 (en) * | 2005-10-12 | 2010-03-16 | Hewlett-Packard Development Company, L.P. | Optical media |
US7968166B2 (en) * | 2006-01-31 | 2011-06-28 | Hewlett-Packard Development Company, L.P. | Optical recording system |
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JP2002219873A (ja) * | 2001-01-25 | 2002-08-06 | Mitsubishi Plastics Ind Ltd | 光記録媒体 |
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DE2738253A1 (de) * | 1977-08-25 | 1979-03-01 | Dabisch Tipp Ex Tech | Koerper mit reversibel temperaturabhaengiger transparenz |
US4695528A (en) * | 1980-07-16 | 1987-09-22 | Wolfgang Dabisch | Process for forming images using body with reversible fixable and temperature-variable light extinctions |
DE3744857C2 (ja) * | 1986-08-05 | 1991-02-14 | Ricoh Co., Ltd., Tokio/Tokyo, Jp | |
JP2726297B2 (ja) * | 1988-01-27 | 1998-03-11 | 株式会社リコー | 可逆性感熱記録材料 |
US5185194A (en) * | 1989-03-31 | 1993-02-09 | Ricoh Company, Ltd. | Heat-mode recording medium |
JP2615200B2 (ja) * | 1989-05-31 | 1997-05-28 | 株式会社リコー | 可逆性感熱記録材料 |
US5273950A (en) * | 1992-04-20 | 1993-12-28 | Tomoegawa Paper Co., Ltd. | Reversible heat-sensitive recording medium |
JP3493482B2 (ja) * | 1994-08-29 | 2004-02-03 | 株式会社リコー | 熱可逆記録媒体及びこれを用いた画像記録消去方法 |
US6096683A (en) * | 1996-10-24 | 2000-08-01 | Ricoh Company, Ltd. | Reversible thermosensitive recording medium and method for producing the medium |
US6362130B1 (en) * | 1997-09-04 | 2002-03-26 | Ricoh Company, Ltd. | Reversible thermosensitive recording medium, card, label, disk, disk cartridge, tape cassette, method of producing the recording medium, and method of recording and erasing images using the same |
GB2332298B (en) * | 1997-12-12 | 2000-05-03 | Ricoh Kk | Optical information memory medium and display recording method using the same |
GB2340292B (en) * | 1998-07-28 | 2002-10-23 | Ricoh Kk | Optical data storage medium capable of reversibly displaying information |
US6794334B2 (en) * | 2000-06-13 | 2004-09-21 | Ricoh Company, Ltd. | Thermo reversible recording medium, member having information memorizing part, thermo reversible recording label, method of and apparatus for image processing |
JP3957044B2 (ja) * | 2001-02-27 | 2007-08-08 | 株式会社リコー | 熱可逆記録媒体、カード及びラベルと画像処理方法 |
JP3970117B2 (ja) * | 2001-07-19 | 2007-09-05 | 株式会社リコー | 熱可逆記録媒体、ラベル、カード、ディスクカートリッジ、ディスク、テープカセット及び画像記録消去方法 |
-
2004
- 2004-01-20 TW TW093101665A patent/TW200501139A/zh unknown
- 2004-01-21 EP EP04703925A patent/EP1587091A4/en not_active Withdrawn
- 2004-01-21 WO PCT/JP2004/000446 patent/WO2004066292A1/ja active Application Filing
- 2004-09-23 US US10/947,270 patent/US20050036768A1/en not_active Abandoned
Patent Citations (1)
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JP2002219873A (ja) * | 2001-01-25 | 2002-08-06 | Mitsubishi Plastics Ind Ltd | 光記録媒体 |
Non-Patent Citations (1)
Title |
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See also references of EP1587091A4 * |
Also Published As
Publication number | Publication date |
---|---|
US20050036768A1 (en) | 2005-02-17 |
TW200501139A (en) | 2005-01-01 |
EP1587091A4 (en) | 2009-03-11 |
EP1587091A1 (en) | 2005-10-19 |
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