WO2005026263A1 - アゾ金属キレート色素及び光学記録媒体 - Google Patents
アゾ金属キレート色素及び光学記録媒体 Download PDFInfo
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- WO2005026263A1 WO2005026263A1 PCT/JP2004/013170 JP2004013170W WO2005026263A1 WO 2005026263 A1 WO2005026263 A1 WO 2005026263A1 JP 2004013170 W JP2004013170 W JP 2004013170W WO 2005026263 A1 WO2005026263 A1 WO 2005026263A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/0025—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds
- C09B29/0074—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing nitrogen and sulfur as heteroatoms
- C09B29/0092—Monoazo dyes prepared by diazotising and coupling from diazotized amino heterocyclic compounds the heterocyclic ring containing nitrogen and sulfur as heteroatoms containing a five-membered heterocyclic ring with two nitrogen and one sulfur as heteroatoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
- C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
- C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B29/00—Monoazo dyes prepared by diazotising and coupling
- C09B29/34—Monoazo dyes prepared by diazotising and coupling from other coupling components
- C09B29/36—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds
- C09B29/3604—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom
- C09B29/3617—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a six-membered heterocyclic with only one nitrogen as heteroatom
- C09B29/3643—Monoazo dyes prepared by diazotising and coupling from other coupling components from heterocyclic compounds containing only a nitrogen as heteroatom containing a six-membered heterocyclic with only one nitrogen as heteroatom from quinolines or hydrogenated quinolines
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B45/00—Complex metal compounds of 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
- G11B7/242—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
-
- 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
-
- 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
- G11B7/249—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 organometallic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/146—Laser beam
Definitions
- Azo metal chelate dye and optical recording medium Azo metal chelate dye and optical recording medium
- the present invention relates to an azo metal chelate dye or the like suitable for high-speed recording, and more particularly, to an azo metal chelate dye exhibiting a specific film absorption spectrum, and an optical recording medium using the azo metal chelate dye (the present invention).
- the optical recording medium may be referred to as “disk” or “optical disk”.
- Patent Document 1 Japanese Patent Application Laid-Open No. 3-268994
- Patent Document 2 JP-A-11-166125
- Patent Document 3 Japanese Patent Application Laid-Open No. 2000-309722
- an object of the present invention is to provide an azo metal chelate dye capable of high-speed recording and an optical recording medium using the azo metal chelate dye.
- the inventors of the present invention consider that it is difficult to increase the reflectance of an optical recording medium in high-speed recording, and that the reflectance of an optical recording medium can be increased by increasing the refractive index of a recording layer.
- an azo metal chelate dye having a higher refractive index.
- the present inventors have found that there is an absorption peak on the long wavelength side of the absorption band existing at 500 nm to 700 nm obtained by measuring the absorption spectrum of a coating film containing a dye! Attention was paid to the absorbance: OD2 and the absorbance at the absorption peak or absorption shoulder on the short wavelength side: OD1.
- the present inventors have found that the refractive index of the dye can be increased by making the value of OD2ZOD1 larger than a predetermined value, and completed the present invention.
- the gist of the present invention is an azo metal chelate dye comprising an azo dye compound and a metal, wherein OD2ZOD1 measured by the following measurement method is larger than 1.25. It is present in zometal chelate dyes.
- Another aspect of the present invention is an optical recording medium having a recording layer on which information is recorded and Z or reproduction is performed by irradiated light, wherein the recording layer has an azo-based color.
- An optical recording medium comprising an azo metal chelate dye comprising an elemental compound and a metal, wherein OD2ZOD1 of the azo metal chelate dye measured by the following measurement method is larger than 1.25.
- an azo metal chelate dye capable of high-speed recording and an optical recording medium capable of high-speed recording using the azo metal chelate dye are provided.
- FIG. 1 is an absorption spectrum of a coated substrate A using the dye of Example 1.
- FIG. 2 is a graph showing a relationship between OD2ZOD1 and a refractive index in a dye film of dyes (S-1) and (S-6).
- FIG. 3 shows OD2ZOD1 values of Example 1—Example 8 and Comparative Example 1—Comparative Example 6. is there.
- FIG. 4 shows the absorption maximum wavelength (wavelength indicating OD2) of the coated substrate A prepared in Example 1 and Example 8 and Comparative Example 1 and Comparative Example 5 and a DVD-ROM inspection machine (647 nm). This is the measurement result of the reflectance of each disk with a radius of 40 mm measured in the above.
- FIG. 5 is a diagram showing an example in which the absorption spectrum of a dye film of an azo metal chelate dye has an absorption shoulder.
- an azo metal chelate dye composed of an azo dye compound and a metal, wherein OD2ZOD1 measured by a predetermined measurement method is larger than 1.25 is used as an azo metal chelate dye. Used.
- a method for performing high-speed recording a method using a dye having a larger absorbance (absorption) at a recording wavelength so as to efficiently absorb a recording laser beam can be considered.
- the wavelength of the absorption maximum of the dye is made longer than that of the dye conventionally used in low-speed recording.
- the reflectivity of the disk tends to be lower than before.
- it is difficult to satisfy the definition of the reflectance stipulated in the optical disc for example, in the case of a DVD, "the reflectance of the disc is 45% or more" and V, the recording section reproduction. , Often. For this reason, in the case of using the above method, it is often necessary to secure the reflectance while sacrificing the recording sensitivity to some extent.
- the present inventors can first obtain a larger disk reflectivity as the refractive index of the dye film (recording layer) increases in a specific film thickness range (90 nm or less) (for example, see Japanese Unexamined Patent Publication No. Based on the findings described in Japanese Patent Application Publication No. 0-208303, see FIG. 1 and FIG. 5), we aimed to obtain an azo metal chelate dye having a higher refractive index.
- the absorption band is considered to be caused by the interaction between the metal and the ligand, which is considered to be due to the electronic state localized in the ligand. (See FIG. 1. FIG. 1 will be described later.)
- the absorbance of the shorter wavelength side absorption peak is OD1
- the longer wavelength side absorption peak is OD2.
- the solution A is subjected to ultrasonic dispersion at 50 ° C-55 ° C for 60 minutes to obtain the solution A. obtain.
- Ultrasonic dispersion is used to dissolve or disperse azo metal chelate dyes in a solvent. It is done to For ultrasonic dispersion, a conventionally known method may be used!
- solution A is cooled to room temperature (25 ° C., 5 ° C.) to obtain solution B.
- a method for cooling solution A leave solution A at room temperature to cool. Rapid cooling of the solution A with ice water or the like is not preferable because excessive crystallization may be promoted.
- the solution A is preferably filtered through a filter (for example, 0.2 m).
- the filter include a Teflon (registered trademark) filter manufactured by Millipore.
- solution A all or a part of the azo metal chelate dye may be present in a state of being dissolved in the solution.
- solution A all or a part of the azo metal chelate dye may be present in a state of being dispersed in the solution.
- the solution B is spin-coated on a polycarbonate substrate at a rotation speed of 800 rpm.
- a device for performing the spin coating a conventionally known device used for forming a recording layer of a CD-R or a DVD-R can be used.
- a solution B-colored coating film may be formed on the polycarbonate substrate by dropping the solution B onto the polycarbonate substrate rotated at 800 rpm.
- the substrate coated with the solution B is kept at 80 ° C. for 5 minutes. This is to remove the solvent in solution B. It is preferable that the solvent be completely removed from solution B by holding at 80 ° C. for 5 minutes. However, as long as the absorption spectrum measurement described below can be performed well, the solvent is completely removed!
- coated substrates A and ⁇ The substrates obtained in this way and coated with the solvent B are referred to as coated substrates A and ⁇ .
- the absorption spectrum of the coated substrate A at 400 nm to 800 nm is measured.
- the absorption spectrum may be measured by a conventionally known method. Specifically, sample light (400 nm to 800 nm) for measuring an absorption spectrum is irradiated from the substrate side of the coated substrate A. Then, air may be used as the reference sample, the light intensity of the reference sample and the intensity of light passing through the coated substrate A may be measured, and the absorption spectrum of the coated substrate A may be measured.
- the following method can be mentioned as a more specific method of the absorption spectrum.
- the disk coated with the azo metal chelate dye film is cut into a fan shape, and measured by irradiating light from the surface opposite to the dye film (the surface on the substrate side) with an ultraviolet-visible spectrophotometer.
- the spectroscope and measurement conditions used for the measurement the usual conditions of a commercially available device may be used.
- U-3300 manufactured by Hitachi, Ltd. was used.
- the measurement was performed in the absorbance measurement (Absorbance) mode with a wavelength scan speed of 300 nm Zmin. And a sampling period of 0.5 nm.
- FIG. 2 is a graph showing the relationship between OD2ZOD1 and refractive index in dye films of various azo metal chelate dyes to which the present embodiment is applied. From the measurement results of FIG. 2, it is clear that the higher the value of OD2ZOD1, the higher the refractive index. According to the measurement result of FIG. 2, the maximum value of the refractive index of the film of 1.25 or more in the present embodiment corresponds to about 3.3.
- the value of OD2ZOD1 is larger than 1.25, preferably 1.26 or more, more preferably 1.27 or more, even more preferably 1.28 or more, since sufficient reflectance can be obtained in high-speed recording applications. Particularly preferred is 1.29 or more.
- the value of OD2ZOD1 is preferably as large as possible for the purpose of the present invention, but is preferably 5 or less, more preferably 3 or less. If it is larger than 5, the wavelength dependence of absorption may increase due to the narrow width of the absorption band.
- FIG. 5 is a diagram showing an example in which the absorption spectrum of a dye film of an azo metal chelate dye has an absorption shoulder.
- a method of obtaining OD2ZOD1 for an absorption spectrum as shown in FIG. 5 will be described.
- the absorption shoulder observed on the short wavelength side in the absorption spectrum from 400 to 700 nm may be set to OD1.
- Preferred examples of the dye having a high OD2ZOD1 value include an azo metal chelate dye having a specific structure. Disks using these dyes for the recording layer show higher reflectance and stable reflectance even when the recording layer has a longer absorption maximum wavelength, compared to disks that used dyes for the recording layer. I got it.
- a 1,3,4-thiadiazole ring is defined as a diazo component.
- an azo dye compound is synthesized by combining the diazo component with a coupler component having an amino group condensed with a fluorine-substituted alkylsulfol-amino group.
- the recording layer containing the azo metal chelate dye formed from the azo dye compound and the metal is preferable because it may have excellent light resistance and weather resistance.
- azo metal chelate dyes in which the 1,3,4-thiadiazole ring of the diazo component is substituted with a hydrogen atom or an ester group tend to have an OD2ZOD1 value that satisfies the requirements of the present embodiment.
- the coordination between the azo ligand and the metal ion is achieved by making the substituent of the diazo component a hydrogen atom having the smallest steric structure or an ester group which itself has a large polarity. This is probably because it can occur in a state with little steric hindrance!
- As a concrete example of a powerful structure
- R is a hydrogen atom or an ester group represented by CO R, and R is
- R is an optionally substituted linear or branched alkyl group, X Or X
- At least one of 2 12 is an NHSO Y group
- Y is a linear or branched alkyl group substituted with at least two fluorine atoms
- R R is each independently hydrogen
- 6, 7, 89 are each independently a hydrogen atom or an alkyl group having 12 to 12 carbon atoms.
- the azo metal chelate dye to which the present embodiment is applied is formed by chelate-bonding the azo dye compound represented by the above formula (1) with a metal. Further, the azo dye compound represented by the formula (1) has a 1,3,4-thiadiazole ring as a diazo component, and a fluorine-substituted alkylsulfonylamino group and a coupler component having a condensed amino group are bonded. It is formed from ⁇ .
- the substituent R in the diazo component is a hydrogen atom or an ester group represented by COR.
- R is a linear or branched alkyl group which may be substituted, or
- R may be a cycloalkyl group.
- the substituent of R may be a halogen atom, oxygen, nitrogen,
- R is, for example, unsubstituted
- a linear or branched alkyl group, an unsubstituted cycloalkyl group, a linear or branched alkyl group substituted with fluorine, and a linear or branched alkyl group substituted with an alkoxy group are preferred.
- R is particularly preferably a hydrogen atom;
- Mouth pill group isopropyl group, butyl group, isobutyl group, t-butyl group, sec-butyl group, etc.
- Particularly preferred are a straight-chain alkyl group having 12 to 12 carbon atoms such as a methyl group and an ethyl group; and a cycloalkyl group having 3 to 6 carbon atoms such as a cyclopentyl group and a cyclohexyl group; .
- the substituent R in the diazo component is most preferably a hydrogen atom having the smallest steric hindrance from the viewpoint of satisfying the predetermined OD2ZOD1 in the present embodiment.
- a specific compound of such a azo component a compound having the structure of the following (Chemical Formula 2) is preferable, and a U ⁇ case is mentioned.
- At least one of X and X in the coupler component represents NHSOY.
- X or X is NHSO Y, and more preferably, X is NHSO
- Y is a linear or branched alkyl group substituted with at least two fluorine atoms. is there.
- alkyl group a linear or branched alkyl group having 1 to 6 carbon atoms is more preferable.
- Y is more preferably a straight-chain alkyl group having 1 to 3 carbon atoms.
- the number of substituted fluorine atoms is usually 2 or more, while it is usually 7 or less, preferably 5 or less, more preferably 3 or less.
- Y include a difluoromethyl group, a trifluoromethyl group, a pentafluoroethyl group, a pentafluoropropyl group, a 2,2,2-trifluoroethyl group, a 3,3,3-trifluoromethyl group. And the like. Y is particularly preferably a trifluoromethyl group or a 2,2,2-trifluoroethyl group.
- R R is each independently a hydrogen atom or a linear or branched
- R is an alkyl group.
- a linear alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group, an n-propyl group, an n-butyl group, an n-pentyl group, and an n-xyl group;
- a branched alkyl group having 3 to 8 carbon atoms such as isopropyl group, sec butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclopropyl group, cyclohexylmethyl group; fluorine, chlorine, bromine, iodine, etc.
- a halogen atom such as isopropyl group, sec butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclopropyl group, cyclohexylmethyl group; fluorine, chlorine, bromine, iodine, etc.
- a halogen atom such as isopropyl group, sec butyl group, isobutyl group, t-butyl group, 2-ethylhexyl group, cyclopropyl group, cyclohexylmethyl group; fluorine, chlorine, bromine, i
- An alkoxy group having 1 to 8 carbon atoms such as a hexyloxy group
- C2 to C16 such as dimethylamino, getylamino, dipropylamino, diisopropylamino, dibutylamino, diisobutylamino, di-tert-butylamino, dihexylamino, ethylmethylamino, butylpentylamino, etc.
- R is a straight-chain alkyl group with a power of 6, and an alkoxy group with 1 to 8 carbon atoms. R more preferred as R
- a hydrogen atom, an alkyl group having 1 to 2 carbon atoms, or an alkoxy group having 1 to 2 carbon atoms are preferably unsubstituted.
- R is a substituted! Or may be a linear or branched alkyl group.
- a linear alkyl group having 1 to 6 carbon atoms such as methyl, ethyl, propyl, butyl, pentyl, hexyl, etc .; isopropyl, sec-butyl, isobutyl, t-butyl, 2 —An example thereof includes a branched alkyl group having 3 to 8 carbon atoms such as an ethylhexyl group, a cyclopropyl group, and a cyclohexylmethyl group.
- Halogen atoms such as fluorine, chlorine, bromine and iodine
- An alkoxy group having 1 to 8 carbon atoms such as a hexyloxy group; Methoxycarbol, ethoxycarbol, n-propoxycarbonyl, isopropoxycarbol, n-butoxycarbol, isobutoxycarbol, sec butoxycarbol, t-butoxycarbol , N pentyloxycarbol, cyclopropylpropylcarboxy, cyclohexylmethoxycarbonyl, 2-ethylhexylcarboxy, and other alkoxycarbols having 2 to 9 carbon atoms Groups: methylcarboxy-, ethylcarboxy-, n-propylcarboxy-
- An alkylcarbol group having 2 to 9 carbon atoms such as a xylcarbyl group;
- C2 to C16 such as dimethylamino, getylamino, dipropylamino, diisopropylamino, dibutylamino, diisobutylamino, di-tert-butylamino, dihexylamino, ethylmethylamino, butylpentylamino, etc.
- R an unsubstituted straight-chain alkyl group having 1 to 6 carbon atoms or carbon
- An unsubstituted branched alkyl group having a prime number of 3 to 8 is preferred.
- the number of carbon atoms is usually 1 or more and 6 or less.
- the number of carbon atoms is preferably 5 or less, more preferably 4 or less.
- the number of carbon atoms is usually 3 or more and 8 or less.
- the carbon number is preferably 7 or less, more preferably 6 or less, still more preferably 5 or less, and particularly preferably 4 or less.
- R is particularly preferably a methyl group
- R, R, R, and R each independently represent a hydrogen atom or an alkyl having 1 to 12 carbons
- An alkyl group having 1 to 2 carbon atoms may be an unsubstituted alkyl group in which a hydrogen atom is bonded to a carbon atom and another hydrogen atom is substituted with another substituent (for example, a halogen atom). Is preferred.
- Examples of the alkyl group having 12 to 12 carbon atoms include a methyl group and an ethyl group. From the viewpoint of ease of synthesis and three-dimensional structure,
- the azo dye compound represented by the general formula (1) generally has a molecular weight of 2,000 or less. Among them, azo-based dye compounds having a molecular weight of 1,000 or less are preferred because they increase the solubility in a solvent and can provide a dye excellent in light resistance, weather resistance, and high reflectance. Among the azo dye compounds represented by the general formula (1), specific examples of the compound include the following (Chemical Formula 3 to Chemical Formula 30).
- the azo metal chelate dye other than the structure.
- dyes having an absorption maximum at a wavelength of 700 nm or less when measured with a dye monolayer film will be used. More preferred is a dye having a maximum absorption at a wavelength of 650 to 500 nm.
- the metal that forms a chelate with the azo dye compound represented by the formula (1) can be.
- a metal a group 9, 10 or 11 element is preferable. It is particularly preferable that such a metal has at least one group power selected from the group consisting of Co, Ni, Cu and Pd.
- the optical recording medium to which the present embodiment is applied has a substrate and a recording layer containing an azo metal chelate dye having OD2ZOD1 larger than 1.25.
- the optical recording medium of the present embodiment has a substrate and a recording layer containing an azo metal chelate dye comprising a azo dye compound represented by the formula (1) and a metal.
- the optical recording medium may have a layered structure in which an undercoat layer, a metal reflective layer, a protective layer, and the like are provided on the substrate as needed.
- An example of a preferred layer configuration is, for example, an optical recording medium having a high reflectance in which a recording layer, a metal reflective layer and a protective layer are provided on a substrate.
- an optical recording medium to which the present embodiment is applied will be described by taking an optical recording medium having a structure having such a layer configuration as an example.
- the material is transparent at the wavelength of the recording light and the reproducing light.
- polycarbonate resin Shiridani butyl resin, acrylic resin such as polymethyl methacrylate, polystyrene resin, epoxy resin, vinyl acetate resin, polyester resin, polyethylene resin, Polymer materials such as polypropylene resin, polyimide resin, amorphous polyolefin, and inorganic materials such as glass are used. It is preferable to use a polycarbonate resin also in terms of high productivity, cost, resistance to moisture absorption and the like.
- the material of these substrates is formed into a disk-like substrate by an injection molding method or the like.
- guide grooves and pits may be formed on the substrate surface.
- Such guide grooves and pits are preferably provided when the substrate is molded, but may also be provided on the substrate using an ultraviolet-cured resin layer.
- the groove pitch is preferably 0.4 ⁇ m or more and 1.2 ⁇ m or less, particularly preferably 0.6 m or more and 0.9 ⁇ m or less. .
- the groove depth is usually 100 nm or more and 200 nm or less as measured by AFM (atomic force microscope). In particular, in order to be able to record from a low speed IX to a high speed 8X, the groove depth is required. It is preferable that the thickness be about 150 nm or more and about 180 nm or less. If the groove depth is larger than the above lower limit, the modulation will appear at a low speed, It is easy to secure an adequate reflectance.
- the groove width is usually from 0.20 ⁇ m to 0.40 ⁇ m as measured by AFM (atomic force microscope). For high-speed recording, the groove width is more preferably 0.28 ⁇ m or more and 0.33 m or less.
- the groove width is larger than the above lower limit value, a sufficient push-pull signal amplitude is easily obtained. Also, the deformation of the substrate greatly affects the recording signal amplitude. For this reason, if the groove width is set to be larger than the above lower limit, when recording at a high speed of 8X or more, it is easy to suppress the influence of thermal interference and easily obtain good jitter. Further, the recording characteristics and recording conditions are improved, for example, the recording power margin is widened and the tolerance for the fluctuation of the laser power is increased. When the groove width is smaller than the above upper limit, thermal interference in a recording mark can be suppressed in low-speed recording such as IX, and an excellent jitter value can be easily obtained.
- the optical recording medium to which this embodiment is applied can record information such as address information, medium type information, recording pulse conditions, and optimum recording power.
- information such as address information, medium type information, recording pulse conditions, and optimum recording power.
- a form for recording such information for example, it is sufficient to use a format such as V, LPP or ADIP described in the DVD-R and DVD + R standards.
- the azo metal chelate dye having the above-mentioned specific characteristics and structure is provided on a substrate or, if necessary, on a subbing layer.
- a recording layer is formed.
- the recording layer containing such an azo metal chelate dye has good sensitivity, high reflectance, and a relatively high decomposition temperature (or a temperature at which the TG-DTA measurement is started).
- the recording layer containing the azo metal chelate dye realizes high-speed recording with a single composition.
- a recording layer using a low-decomposition temperature dye having a large absorption coefficient at a recording light wavelength or a decomposition temperature of less than 240 ° C is known.
- the recording layer containing the azo metal chelate dye having the specific characteristics and structure described above these problems can be solved and high-speed recording can be performed.
- the dye used in such a recording layer has a deep absorption wavelength, that is, a high absorption coefficient at the recording / reproducing wavelength. Instead, a high reflectance is obtained. This is probably because the recording layer has a high refractive index.
- the recording layer of an optical recording medium preferably has a refractive index of 23 at a recording / reproducing light wavelength ⁇ 3 nm and an extinction coefficient of 0.03-0.1.
- the refractive index within this range is preferably as high as possible (for example, 2.5 or more). This is because the larger the refractive index, the greater the optical path difference at the same film thickness and the greater the degree of recording modulation, which is preferable.
- the reflectivity of the disk the higher the refractive index, the higher the recording modulation degree with a smaller film thickness.
- a method for forming a recording layer in an optical recording medium to which the present embodiment is applied general methods such as a vacuum evaporation method, a sputtering method, a doctor blade method, a casting method, a spin coating method, and a dipping method are used. Thin film forming method.
- the spin coating method is particularly preferred from the viewpoint of mass productivity and cost.
- the number of rotations is preferably from 500 to 100 rpm.
- a treatment such as heating or exposure to a solvent vapor may be performed.
- the coating solvent is not particularly limited as long as it does not attack the substrate.
- the coating solvent include ketone alcohol-based solvents such as diacetone alcohol and 3-hydroxy-3-methyl-2-butanone; solvent-based solvents such as methylacet-solve and ethyl-solve, and n-hexane and n-octane.
- Chain hydrocarbon solvents cyclohexane, methylcyclohexane, ethylcyclohexane, dimethylcyclohexane, n-butylcyclohexane, t-butylcyclohexane, cyclooctane, and other cyclic hydrocarbon solvents; tetrafluoropropanol And perfluoroalkyl alcohol solvents such as octafluoropentanol and hexafluorobutanol; and hydroxycarboxylic acid ester solvents such as methyl lactate, ethyl lactate and methyl isobutyrate.
- additives such as quencher, an ultraviolet absorber, and an adhesive may be mixed with the above-mentioned dye.
- quencher effect UV absorption effect It is also possible to introduce a substituent having various effects such as the above into the dye.
- singlet oxygen quencher that can be added to improve the light resistance and durability of the recording layer include acetyl acetonate, bisdithioa diketone and bisphenoldithiol, and other bisdithiols, thiocatechol, and salicylaldehyde.
- Metal complexes such as oxime and thiobisphenolate are preferred.
- amine compounds are suitable.
- an azo metal chelate dye to which the present embodiment is applied may be used in combination with a low-speed recording dye so that high-speed recording and low-speed recording can be compatible.
- the compounding ratio is less than 60%, preferably 50% or less, more preferably 40% or less based on the weight of the azo metal chelate dye.
- the mixing ratio is usually 0.01% or more. If the mixing ratio of the dye for low-speed recording is excessively large, the recording sensitivity required for high-speed recording of 8X or higher may not be obtained sufficiently! /.
- Examples of the dye that can be used in combination include an azo dye compound of the same type as the azo dye compound represented by the formula (1).
- the dyes that can be used in combination are azo dyes or azo metal chelate dyes, cyanine dyes, squarylium dyes, and naphthoquinone dyes of the same type as the azo metal chelate dyes having the above specific properties or structures.
- the thermal decomposition accelerator for the dye include metal compounds such as a metal-based anti-knocking agent, a methacrylic acid conjugate, and an acetyl-acetonato-based metal complex.
- a binder, a leveling agent, an antifoaming agent and the like can be used in combination.
- Preferred binders include polybutyl alcohol, polybutylpyrrolidone, nitrocellulose, cellulose acetate, ketone resin, acrylic resin, polystyrene resin, urethane resin, polybutyral, polycarbonate, polyolefin and the like.
- the thickness of the recording layer is not particularly limited, but is preferably 50 nm or more and 300 nm or less. When the thickness of the dye layer is larger than the above lower limit, the effect of thermal diffusion can be suppressed, and good recording is performed. Also, since the recording signal is hardly distorted, the signal amplitude is large. When the thickness of the dye layer is smaller than the above upper limit, the reflectance is high and the reproduction signal characteristics are good.
- the groove thickness of the recording layer is usually 90 nm or more and 180 nm or less, preferably 50 nm or more and 90 nm or less, and the inter-groove film thickness is usually 50 nm or more and 100 nm or less, preferably 3 Onm or less. Not less than 70 nm. If the groove thickness or the inter-groove thickness is larger than the above lower limit, the amplitude of the address information (LPP or ADIP) can be increased, and the occurrence of an error can be easily suppressed. When the groove film thickness or the inter-groove film thickness is smaller than the above upper limit, it is possible to suppress the influence of the heat storage in the recording mark and to increase the crosstalk, and the jitter is likely to be good.
- the optical recording medium to which the present embodiment is applied is a combination of a recording layer containing an azo metal chelate dye having the specific characteristics or structure described above, and a groove shape provided on the substrate. By combining them, the reflectance can be increased to 40% or more. Therefore, for example, a DVD-R that is compatible with DVD-ROM playback (there are two types of DVD-R and DVD + R in the standard, but hereinafter collectively referred to as DVD-R) is realized. Can be.
- the reflectivity is measured by using a disc player (eg, DVD player, DVD-ROM inspection machine, DVD drive) equipped with a laser with a wavelength of 650 nm + lOnm-5 nm when tracking is performed on the groove of the optical disc. ) Means the reflectivity measured.
- a reflection layer having a thickness of preferably 50 nm to 300 nm is formed on the recording layer.
- a material having a sufficiently high reflectivity at the wavelength of the reproducing light for example, a metal such as Au, Al, Ag, Cu, Ti, Cr, Ni, Pt, Ta and Pd, alone or as an alloy should be used. Is possible. Among them, Au, Al, and Ag have high reflectivity and are suitable as the material of the reflective layer. In particular, Ag and an Ag alloy are preferable because of their high reflectivity and high thermal conductivity. Further, in addition to these metals, the following may be included.
- Mg, Se, Hf, V, Nb, Ru, W, Mn, Re, Fe, Co, Rh, Ir, Cu, Zn, Cd, Ga, In, Si ⁇ Ge, Te, Pb, Po, Sn, Metals such as Bi and metalloids can be mentioned.
- those containing Ag as the main component The cost is low, the reflectance tends to improve when combined with an azo metal chelate dye, and when a print receiving layer described later is provided, a beautiful white ground color can be obtained.
- the main components are those whose content is 50% or more. It is also possible to form a multilayer film by alternately stacking low-refractive-index thin films and high-refractive-index thin films with a material other than a metal and use it as a reflective layer.
- Examples of the method for forming the reflective layer include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method.
- a known inorganic or organic intermediate layer or adhesive layer may be provided on the substrate or below the reflective layer to improve the reflectance, improve the recording characteristics, improve the adhesiveness, and the like.
- the material of the protective layer formed on the reflective layer is not particularly limited as long as it protects the reflective layer from external force.
- examples of the organic substance include thermoplastic resin, thermosetting resin, electron beam curable resin, and UV curable resin.
- examples of the inorganic substance include SiO, SiN, MgF, and SnO. Thermoplastic resin, thermosetting resin, etc.
- the uv-curable resin can be formed by dissolving in a suitable solvent, applying a coating solution, and drying.
- the uv-curable resin can be formed by preparing a coating solution as it is or by dissolving it in an appropriate solvent, applying the coating solution, and irradiating with UV light to cure the resin.
- an atalylate-based resin such as urethane acrylate, epoxy acrylate, or polyester acrylate can be used. These materials may be used alone or as a mixture, or may be used not only as a single layer but also as a multilayer film.
- a coating method such as a spin coating method or a casting method, a sputtering method, and a dangling evaporation method are used as in the case of the recording layer.
- the method is preferred.
- the thickness of the protective layer is usually in a range from 0.1 m to 100 ⁇ m. In the present embodiment, the thickness of the protective layer is preferably at least 3 m, more preferably at least 5 m, but is preferably at most 30 ⁇ m, more preferably at most 20 ⁇ m.
- the optical recording medium may have two or more recording layers.
- a UV curable resin, an inorganic thin film or the like may be formed to protect the surface and prevent adhesion of dust and the like.
- a print receiving layer can be further formed on a protective layer provided on the reflective layer, on a substrate bonded to the reflective layer surface, or the like.
- Recording on the optical recording medium obtained as described above is usually performed by irradiating a recording layer provided on both sides or one side of the substrate with a laser beam.
- thermal deformation of the recording layer occurs such as decomposition, heat generation, and melting due to absorption of laser light energy.
- Reproduction of the recorded information is usually performed by reading the difference in reflectance between the portion where the thermal deformation occurs due to the laser beam and the portion where the thermal deformation does not occur.
- the laser used for recording and reproduction there is no particular limitation on the laser used for recording and reproduction.
- a dye laser capable of selecting a wavelength in a wide range of the visible region a helium neon laser with a wavelength of 633 nm, and recently developed wavelengths of 680, 660, and 635 nm
- High-power semiconductor lasers in the vicinity blue lasers in the vicinity of 400 nm, and harmonic-converted YAG lasers with a wavelength of 532 nm.
- semiconductor lasers are preferred in terms of lightness, ease of handling, compactness, cost, and the like.
- the optical recording medium to which this embodiment is applied enables high-density recording and reproduction at one wavelength or a plurality of wavelengths selected from these.
- the present embodiment will be specifically described by way of examples. However, the present embodiment does not limit the present embodiment unless it exceeds the gist.
- the thus prepared ⁇ zone nickel chelate dye 1. 7 weight 0/0 O Kuta Full O b pentanoate Lumpur (hereinafter, OFP) solution, the track pitch 0. 74 m, groove depth 160 nm, groove width 0
- OFP O Kuta Full O b pentanoate Lumpur
- the solution was spin-coated on a transparent polycarbonate substrate having a guide groove of 31 ⁇ m and dried at 100 ° C. for 20 minutes.
- the inter-groove film thickness of this recording layer was 55 nm, and the groove film thickness was 85 nm.
- 120 nm of silver was sputtered on the recording layer, 3 m of ultraviolet curing resin was spin-coated, and a dummy substrate having no grooves (the same transparent substrate) was adhered after spin-coating with an adhesive.
- the recording sensitivity at 8X is preferably around 28 mW.
- the jitter is less than 9%, preferably less than 8%.
- azo compounds 2c represented by the following structural formula 2c and azo compounds obtained by using nickel as starting materials using compounds represented by the following structural formulas 2a and 2b A chelating dye was prepared.
- the maximum absorption wavelength of this azonickel chelate dye in black hole form was 589 nm
- the gram extinction coefficient was 139 LZgcm
- the absorption maximum of the coating film was 609 nm.
- a disk was prepared in the same manner as in Example 1 except that the dye was changed to the dye having the above structure, and the film thickness was reduced to 75% of that in Example 1 (the film thickness between the grooves was about 41 nm, and the film thickness of the groove was about 64 nm). Produced. Recording and reproduction of this disc were performed in the same manner as in Example 1.
- the 8X recording sensitivity was 22 mW, and the jitter was as good as 7.7%.
- the reflectance was 46%.
- an azo compound represented by the following structural formula 3c was prepared using the following structural formulas 3a and 3b as starting materials, and nickel of the azo compound 3c was prepared.
- An azo nickel chelate dye was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 588 nm
- the gram extinction coefficient was 143 LZgcm
- the maximum absorption wavelength of the coating film was 607 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the 8X recording sensitivity was 24.8 mW, the jitter was 7.3%, and the reflectance was 47%.
- an azo compound represented by the following structural formula 4c was prepared using the following structural formula 4a and the following structural formula 4b as starting materials, and was prepared from the azo compound 4c and nickel.
- An azo nickel chelate dye was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 587 nm
- the gram extinction coefficient was 139 LZgcm
- the maximum absorption wavelength of the coating film was 610 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the 8X recording sensitivity was 23.6 mW, the jitter was 7.2%, and the reflectivity was 46%.
- an azo compound represented by the following structural formula 5c was prepared using the following structural formula 5a and the following structural formula 5b as starting materials, and was prepared from the azo compound 5c and nickel. Become An azo nickel chelate dye was obtained. The maximum absorption wavelength of this azo nickel chelate dye in black hole form was 587 nm, the gram extinction coefficient was 139 LZgcm, and the maximum absorption wavelength of the coating film was 608 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the 8X recording sensitivity was 23.6 mW, the jitter was 7.4%, and the reflectivity was 48%.
- an azo compound represented by the following Structural Formula 6c was prepared using the following Structural Formula 6a and the following Structural Formula 6b as starting materials, and was prepared from the azo compound 6c and nickel.
- An azo nickel chelate dye was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 590 nm
- the gram extinction coefficient was 140 LZgcm
- the absorption wavelength of the coating film was 608 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the recording sensitivity of 8X was 25mW, the jitter was 7.4%, and the reflectance was 47%, which was good.
- an azo compound represented by the following structural formula 7c was prepared using the following structural formula 7a and the following structural formula 7b as starting materials, and prepared from the azo compound 7c and nickel.
- An azo nickel chelate dye was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 590 nm
- the gram extinction coefficient was 137 LZgcm
- the maximum absorption wavelength of the coating film was 609 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the recording sensitivity of 8X was as good as 25.8 mW, jitter 7.6%, and reflectivity 47%.
- an azo compound represented by the following structural formula 8c was prepared using the following structural formula 8a and the following structural formula 8b as starting materials, and was prepared from the azo compound 8c and nickel.
- An azo nickel chelate dye was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 595 nm
- the gram extinction coefficient was 137 LZgcm
- the maximum absorption wavelength of the coating film was 613 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structure. . Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the 8X recording sensitivity was as good as 22.8 mW, the jitter was 7.8%, and the reflectance was 48%. Incidentally, the recording modulation degree in the IX recording of each of the discs of Example 2 to Example 8 was 40 to 50%.
- Example 2 Under the same conditions as in Example 1, a nickel chelate dye with the azoi conjugate 101c was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 580 nm
- the gram extinction coefficient was 142 LZgcm
- the maximum absorption wavelength of the coating film was 598 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the above dye. Then, recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, even though the laser light intensity was increased to 28 mW, even 4X recording was not possible due to the poor recording sensitivity (jitter> 14%). The reflectance of this disk was 58% as measured by a DVD-ROM inspection machine.
- a disk was prepared in the same manner as in Comparative Example 1 except that the dye was changed to the dye having the above structural formula. Recording and reproduction of this disc were performed in the same manner as in Example 2. As a result, the recording sensitivity was still insufficient at 48 mW, which was sufficient for even 4X recording, and the jitter was not good at 13%. The reflectance of this disc measured by a DVD-ROM inspection machine is 48%.
- the azo nickel chelate dye prepared in Example 4 and the nickel chelate dye prepared in Comparative Example 2 were mixed at a weight ratio of 60:40, and the mixed dye to the solvent was 1.9 wt.
- A% OFP solution was prepared. Next, this solution was spin-coated on a polycarbonate substrate having a guide groove with a track pitch of 0.74 ⁇ m, a groove depth of 163 ⁇ m, and a groove width of 0.32 / zm, and a film thickness between the grooves of 60 nm and a groove film. A recording layer having a thickness of 90 nm was formed. Otherwise, a disk was prepared in the same manner as in Example 2, recorded at 8X, and reproduced at IX.
- the recording sensitivity of 8X recording was as good as 25.4 mW, the jitter was 7.3%, and the reflectance was 49%.
- the recording sensitivity was 6. OmW, the jitter was 7.1%, and the recording modulation was 61%.
- good recording characteristics were obtained even in the IX recording. In other words, it showed a disc characteristic that satisfies the DVD-R standard in both IX and 8X
- Example 9 Discs were produced under the same conditions and method as in Example 9, except that the dye was changed to the dye prepared in Example 2 and the dye prepared in Comparative Example 1. Recording and reproduction were performed in the same manner as in Example 9. As a result, 8X recording sensitivity was 26mW, jitter 7.2%, reflectivity 49%, and IX recording sensitivity was 6.2mW, jitter 7.1%, recording modulation degree 60%. Recording and reproduction characteristics were obtained.
- Discs were prepared under the same conditions and method as in Example 9, except that the dye was changed to the dye prepared in Example 5 and the dye prepared in Comparative Example 1 (weight ratio: 60:40). Produced. Recording and reproduction were performed in the same manner as in Example 9. As a result, 8X recording sensitivity was 26.2mW, jitter 7.3%, reflectance 50%, IX recording sensitivity was 6.2mW, jitter 7.1%, recording modulation degree was 61%, good recording and reproduction. Characteristics were obtained.
- Discs were prepared under the same conditions and method as in Example 9 except that the dye was changed to a mixed dye having a weight ratio of 50:50 between the dye prepared in Example 1 and the dye prepared in Comparative Example 1. . Recording and reproduction were performed in the same manner as in Example 9. As a result, although the 8X recording sensitivity was slightly insufficient at 28 mW, the jitter was 7.5% and the reflectance was 52%, and the IX recording sensitivity was 6.4mW, the jitter was 7.1%, and the recording modulation was 61%, which was good. Met.
- Example 2 Under the same conditions as in Example 1, a nickel chelate dye with the azozoide 105c was obtained.
- the maximum absorption wavelength of this azonickel chelate dye in black hole form was 589 nm
- the gram extinction coefficient was 109 LZgcm
- the maximum absorption wavelength of the coating film was 607 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structural formula. Recording and reproduction were performed in the same manner as in Example 2. As a result, the recording sensitivity was slightly insufficient at 28 mW, and the jitter was not good at 9.3%. Same as Example 9 that can increase recording sensitivity When the recording was performed under the proper recording conditions, the 8X recording sensitivity was 25 mW. The thermal interference was too large, and the jitter was 11%. The reflectance of this disk measured by a DVD-ROM inspection machine was 46%.
- Example 2 Under the same conditions as in Example 1, a nickel chelate dye with the azozoide 106c was obtained.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 585 nm
- the gram extinction coefficient was 132 LZgcm
- the maximum absorption wavelength of the coating film was 609 nm.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structural formula. Recording and reproduction were performed in the same manner as in Example 2.
- the recording sensitivity of 8X was 22mW, which was a good force. Due to the large thermal interference, good recording characteristics were obtained only at a power lmW lower than the recording sensitivity. The reflectivity was 39%, which was undesirable for DVD-R playback operation.
- a disk was prepared in the same manner as in Example 2 except that the dye was changed to the dye having the above structural formula. Then, recording and reproduction were performed under the same recording conditions as in Comparative Example 1. As a result, even at 28mW, the recording sensitivity was not enough even for 4X recording, and good recording could not be performed. The reflectance of this disc measured by a DVD-ROM inspection machine was 46%.
- Iron powder 31.4 g was suspended in 183 ml of DMF-water (2: 1), heated to 85-90 ° C with stirring, and 6.7 ml of hydrochloric acid was added thereto, and DMF-water (2: 1). A solution mixed with 91.5 ml was added dropwise. Subsequently, 183 ml of a DMF solution of the compound 12.Og of the compound represented by the above structural formula (f) was added dropwise over 15 minutes while maintaining the temperature at 85 to 95 ° C. After stirring at 80-90 ° C for 20 minutes, 6.39 g of sodium hydrogencarbonate was added while cooling, and the mixture was stirred for 10 minutes.
- Example 1 One Example 8, Comparative Example 1 20 mg of the dye of Comparative Example 6 was added to 2 g of octafluoropentanol (OFP) solvent, and then the mixture was heated at 50 ° C. to 55 ° C. for more than 60 minutes.
- Solution A was obtained by sonic dispersion. After cooling the solution A to room temperature (25 ⁇ 5 ° C), 0.2 m Millipore The solution B was obtained by filtration through a filter.
- the solution B was spin-coated at a rotation speed of 800 pm on a polycarbonate substrate having a groove depth of 170 nm, a groove width of 500 nm, and a track pitch of 1600 nm and a thickness of 1.2 mm.
- the thus-obtained film having a single dye composition was kept in a blow dryer at 80 ° C. for 5 minutes, and then left in a room to be cooled to room temperature (preparation of coated substrate A).
- the absorption spectrum of the coated substrate A was measured.
- the coated substrate A was cut into a fan shape and used as a measurement sample.
- the reference sample was air.
- the measurement was performed using U-3300 manufactured by Hitachi, Ltd.
- the measurement was performed in an absorbance measurement mode (wavelength scan speed: 300 nm Zmin., Sampling cycle: 0.5 nm).
- FIG. 1 shows an absorption spectrum of the coated substrate A using the dye of Example 1.
- Table 1 shows the wavelength and absorbance of ODl and OD2 of each coated substrate A, and the values of OD2ZOD1.
- FIG. 3 shows the values of OD2ZOD1 in Example 1-Example 8 and Comparative Example 1-Comparative Example 6. From the results shown in FIG. 3, a boundary of 1.25 is seen between Example 1-Example 8 and Comparative Example 1-Comparative Example 6. Furthermore, FIG. 4 shows the absorption maximum wavelength (wavelength indicating OD2) of the coated substrate A prepared in Example 1 and Example 8 and Comparative Example 1 and Comparative Example 5 and a DVD-ROM inspection machine (647 nm). The measurement results of the reflectivity of each disc with a radius of 40 mm, which were measured in the above, are shown. From the results shown in FIG.
- an azo metal chelate dye having the following structural formula ((S-1)-(S-6)) was added to 5 g of each OFP solvent, and ultrasonically dispersed at 50 ° C. for 60 minutes. Thereafter, the solution was left in a room and cooled to room temperature. The solution was filtered through a 0.2 / zm Millipore filter, and the resulting solution was placed on a mirror replica (polycarbonate substrate without guide grooves) so as to cover approximately half the area of the board, and spin-coated. did. After drying, a reflective layer was sputtered on a part of the spin-coated recording layer.
- the film thickness was determined by measuring the step between the uncoated portion covered with the reflective layer and the recording layer covered with the reflective layer using a three-dimensional surface roughness meter (ZYGO: Maxim5800, manufactured by Canon Inc.).
- the recording layer without a reflective layer is irradiated with light from 580 nm to 650 nm using an automatic wavelength scan ellipsometer (MEL-30S type, manufactured by JASCO Corporation), and the reflectance and reflectance are measured in multiple incidence angle measurement mode. The phase difference was measured.
- the combination of the refractive index n and the extinction coefficient k with a good focusing condition was determined at each wavelength with reference to the above film thickness.
- the refractive index n for which the maximum value was determined was set.
- Table 2 and FIG. 2 show OD2ZOD1 and n (maximum refractive index) obtained as described above. Data points are from the left (from the smaller OD2ZOD1 to the larger) It is the value of dye (S-1) -one (S-6).
- Example 2 It was manufactured under the same conditions as in Example 1 by using the following structural formulas 13a and 13b as starting materials to obtain a nickel chelate dye with an azoi conjugate 13c.
- the maximum absorption wavelength of this azonickel chelate dye in black hole form was 588 nm, the gram absorption coefficient was 130 LZgcm, and the absorption maximum of the coating film was 604 nm.
- the maximum absorption wavelength of this azonickel chelate dye in black hole form was 588 nm, the gram extinction coefficient was 138 LZgcm, and the maximum absorption wavelength of the coating film was 608 nm.
- Example 2 Under the same conditions as in Example 1, it was produced using the following structural formula 17a and the following structural formula 17b as starting materials to obtain a nickel chelate dye of azoi conjugate 17c.
- the maximum absorption wavelength of this azo nickel chelate dye in black hole form was 596 nm, the gram extinction coefficient was 150 LZgcm, and the maximum absorption wavelength of the coating film was 613 nm.
- an azo metal chelate dye capable of high-speed recording and an optical recording medium capable of high-speed recording using the azo metal chelate dye are provided.
Abstract
Description
Claims
Priority Applications (6)
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EP04787833A EP1666538B8 (en) | 2003-09-11 | 2004-09-09 | Azo metal chelate coloring matter and optical recording medium |
TW095132911A TWI288160B (en) | 2003-09-11 | 2004-09-10 | Azo metal chelate dyestuff and optical recording medium |
TW093127490A TWI276666B (en) | 2003-09-11 | 2004-09-10 | Azo-metal chelate dye and optical recording medium |
US11/205,078 US7642036B2 (en) | 2003-09-11 | 2005-08-17 | Azo-metal chelate dye and optical recording medium |
HK06110570A HK1088627A1 (en) | 2003-09-11 | 2006-09-21 | Azo-metal chelate dye and optical recording medium |
US12/481,603 US7989139B2 (en) | 2003-09-11 | 2009-06-10 | Azo-metal chelate dye and optical recording medium |
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US7507524B2 (en) | 2005-09-06 | 2009-03-24 | Mitsubishi Kagaku Media Co., Ltd. | Azo-metal chelate dye and optical recording medium |
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CN100343340C (zh) * | 2003-09-11 | 2007-10-17 | 三菱化学株式会社 | 偶氮金属螯合染料及光学记录媒体 |
WO2008038603A1 (fr) * | 2006-09-25 | 2008-04-03 | Mitsubishi Kagaku Media Co., Ltd. | Colorant azo-chélate métallique et support d'enregistrement optique |
CN101528860A (zh) * | 2006-09-29 | 2009-09-09 | 三菱化学媒体株式会社 | 偶氮金属螯合色素以及光学记录介质 |
CN100484926C (zh) * | 2006-11-17 | 2009-05-06 | 中国科学院上海光学精密机械研究所 | 偶氮金属螯合物及其制备方法 |
CN101235213B (zh) * | 2007-02-02 | 2011-04-20 | 上海拓引数码技术有限公司 | 一类光功能染料偶氮类化合物及其制备方法 |
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WO1991018057A1 (fr) * | 1990-05-17 | 1991-11-28 | Mitsubishi Kasei Corporation | Compose de chelate metallique et support d'enregistrement optique prepare a partir de ce compose |
EP0717403B1 (en) * | 1994-12-15 | 2001-09-05 | Eastman Kodak Company | Heterocyclylazoaniline dyes, heterocyclylazoaniline dye metal complexes and their use in optical elements |
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2004
- 2004-09-09 CN CNB2004800052778A patent/CN100343340C/zh not_active Expired - Fee Related
- 2004-09-09 CN CNA2007100971778A patent/CN101045825A/zh active Pending
- 2004-09-09 WO PCT/JP2004/013170 patent/WO2005026263A1/ja active Application Filing
- 2004-09-09 EP EP04787833A patent/EP1666538B8/en not_active Expired - Fee Related
- 2004-09-10 TW TW095132911A patent/TWI288160B/zh not_active IP Right Cessation
- 2004-09-10 TW TW093127490A patent/TWI276666B/zh not_active IP Right Cessation
-
2005
- 2005-08-17 US US11/205,078 patent/US7642036B2/en not_active Expired - Fee Related
-
2006
- 2006-09-21 HK HK06110570A patent/HK1088627A1/xx not_active IP Right Cessation
-
2009
- 2009-06-10 US US12/481,603 patent/US7989139B2/en not_active Expired - Fee Related
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US7507524B2 (en) | 2005-09-06 | 2009-03-24 | Mitsubishi Kagaku Media Co., Ltd. | Azo-metal chelate dye and optical recording medium |
Also Published As
Publication number | Publication date |
---|---|
US20090246687A1 (en) | 2009-10-01 |
US7642036B2 (en) | 2010-01-05 |
EP1666538A1 (en) | 2006-06-07 |
CN101045825A (zh) | 2007-10-03 |
TWI276666B (en) | 2007-03-21 |
TW200513500A (en) | 2005-04-16 |
EP1666538A4 (en) | 2008-10-08 |
EP1666538B1 (en) | 2011-06-08 |
US7989139B2 (en) | 2011-08-02 |
HK1088627A1 (en) | 2006-11-10 |
US20060035171A1 (en) | 2006-02-16 |
TWI288160B (en) | 2007-10-11 |
CN100343340C (zh) | 2007-10-17 |
CN1753955A (zh) | 2006-03-29 |
EP1666538B8 (en) | 2011-09-28 |
TW200702393A (en) | 2007-01-16 |
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