JP3451332B2 - Optical recording medium and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium having improved optical characteristics and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, the development of a write-once CD (compact disc) has become active. This is a conventional CD
Unlike a CD, a user can record information and the signal after recording satisfies the standard of the conventional CD, so that a commercial CD
It has the feature that it can be played back by the player. As one of methods for realizing such a medium, Japanese Patent Laid-Open No. 2-4
In Japanese Patent No. 2652, it is proposed that a dye is spin-coated on a substrate to provide a recording layer , and a metal reflective layer is provided behind it. Furthermore, Japanese Patent Laid-Open No. 2-132
As described in Japanese Patent No. 656, by appropriately selecting the complex refractive index and the film thickness of the recording layer , the signal after recording becomes C
Now that it meets the D standard, it has been commercialized as a write-once CD.

[0003]

However, Japanese Unexamined Patent Application Publication No.
The write-once type CDs using the dyes disclosed in JP-A-42652 and JP-A-2-132656 are still insufficient in light resistance. In other words, the signal characteristics change when exposed to sunlight for a long time, and the CD
There is a drawback that the standard cannot be satisfied. This is because the dye material used in the recording layer , especially the cyanine dye that has been conventionally used, is changed by light. Therefore, in order to suppress this change, Japanese Patent Laid-Open No. 63-
As disclosed in Japanese Patent No. 159090, it is known that a recording layer contains a light stabilizer. However, when the light stabilizer is added in a small amount (20% or less), sufficient light resistance cannot be obtained, and conversely, when added in a large amount (20% or more), the optical and / or optical properties of the recording layer are not increased. There is a problem that the thermal characteristics change and various signal qualities deteriorate.

On the other hand, JP-A-3-62878 discloses a write-once type CD using a phthalocyanine compound which is a highly light-resistant dye. By adding a specific group to the phthalocyanine compound, the complex refractive index of the recording layer spin-coated with the phthalocyanine compound was adjusted to a value required for the write-once type CD, and a high light resistance write-once type CD was realized. is there. However, the write-once type CD disclosed in Japanese Patent Laid-Open No. 3-62878 was inferior in the quality of the reproduced signal as compared with the one using the conventional cyanine dye in the recording layer . That is, there is a problem that the length (pit length) of each signal forming the reproduction signal is likely to deviate from the original theoretical value of the CD signal, and a reproduction error may occur.

Therefore, it is an object of the present invention to provide a high lightfastness optical recording medium using a phthalocyanine compound for the recording layer , which does not have the above-mentioned problems related to reproduction signals, and a method for producing the same.

[0006]

As a result of intensive studies, the present inventor has found that, in the above-mentioned conventional optical recording medium, a phthalocyanine compound represented by the following general formula (I):
By using a coordinated bond with a nitrogen-containing compound selected from a substituted or cyclized amino compound, an imino compound and an azo compound, it has been found that the above problems can be solved, and the present invention It came to completion.

That is, according to the present invention, in an optical recording medium in which at least a recording layer is provided on a substrate, the recording layer is substituted with a metal phthalocyanine compound (1) represented by the following general formula (I) or Provided is an optical recording medium, which comprises a coordination bond with a nitrogen-containing compound (2) selected from an optionally cyclized amino compound, imino compound and azo compound as a main component. To be done.

[Chemical 1] (In the formula, M and A ^{1 to} A ⁸ each represent the following: M: at least one divalent selected from Mn ²⁺ , Fe ²⁺ , Co ²⁺ , Zn ²⁺ and Cd ^2+. Metal atoms of A ¹ and A ² , A
³ and A ⁴ , A ⁵ and A ^6, and A ⁷ and A ⁸ : one of each is —QR ¹ or a thiophenyl group represented by the following general formula (II), and the other is a hydrogen atom or a halogen atom,
And -QR ¹ or the following general formula (II) thiophenyl system group represented by each of at least one perforated. Q: O
Or S atom. General formula (II):

[Chemical 2] R ¹ : a linear, branched or cyclic alkyl group having 4 to 10 carbon atoms. R ^{2 to} R ⁶ : each independently a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms or 1 to 3 carbon atoms
The alkoxy group. )

Further, according to the present invention, in a preferable embodiment, recording using imidazole, benzimidazole or thiazole derivative as the nitrogen-containing compound (2).
An optical recording medium having a layer , wherein R ^{2 of the} phthalocyanine compound (1) is selected from methyl, ethyl, n-propyl, iso-propyl, methoxy, ethoxy, n-propyloxy, and iso-propyloxy. optical recording medium formed by providing a recording layer using a single group compounds, but also the recording layer is an optical recording medium are those having a light absorption peak wavelength (.lambda.max) are provided in a range of 710~750nm It

Furthermore, according to the present invention, a metal phthalocyanine compound represented by the above general formula (I) is directly or via another layer on a substrate having information pits and / or guide grooves formed on the surface thereof. A recording layer containing a coordination bond of (1) and a nitrogen-containing compound (2) selected from an optionally substituted or cyclized amino compound, imino compound and azo compound as a main component is formed by coating. A method for manufacturing an optical recording medium is provided, in which a light reflecting layer is provided by means of a vacuum film forming means directly or via another layer, and a protective layer is further provided thereon.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The optical recording medium of the present invention has a recording layer containing a metal phthalocyanine compound (1) represented by the general formula (I) and a nitrogen atom selected from a substituted or cyclized amino compound, imino compound and azo compound. It is characterized in that it is composed mainly of a coordination bond with the containing compound (2).

[Chemical 1] That is, in the optical recording medium of the present invention, the metal phthalocyanine compound (1) used in the recording layer has a structure represented by the above general formula (I). As the central metal M, Mn ²⁺ , Fe ²⁺ , Co ²⁺ , Zn ²⁺ and Cd ²⁺ can be used, and Zn ²⁺ is particularly preferable. In the phthalocyanine-based compound (1) having the central metal M, the -N = or -N <group in the nitrogen-containing compound (2) is easily coordinated to the central metal, and the phthalocyanine-based compound is less likely to associate, A recording layer having good solubility and having a complex refractive index necessary for a write-once type CD can be formed.

Further, in -QR ¹ contained in the substituents represented by A ^{1 to} A ⁸ , Q represents an O or S atom, and R ¹ represents
It represents a linear, branched or cyclic alkyl group having 4 to 10 carbon atoms . Specific examples of R ¹ include n-butyl, iso-butyl, tert-butyl, sec-butyl, n-pentyl, iso-pentyl, tert-pentyl, neo-.
Pentyl, 1-methylbutyl, 2-methylbutyl, n-
Hexyl, 2-ethylbutyl, cyclohexyl, 2-methylcyclohexyl, 2,4-dimethylcyclohexyl, adamantyl, bornyl, 1,3,3-trimethylnorbornyl and the like can be mentioned, but preferably they are excellent in optical properties and heat resistance. A branched or cyclic alkyl group is preferable.
(In the case of a straight chain, the heat resistance is poor and it is difficult to obtain a high refractive index.)

On the other hand, R ^{2 to} R ⁶ of the thiophenyl group contained in the substituents represented by A ^{1 to} A ⁸ and represented by the following general formula (II) may be the same or different. , R ^{2 to} R ⁶ are each independently a hydrogen atom and a carbon number of 1 to 1.
It represents a straight-chain, branched or cyclic alkyl group having 0 or an alkoxy group having 1 to 3 carbon atoms .

[Chemical 2] Specific examples of R ^{2 to} R ⁶ include a hydrogen atom, methyl, ethyl, n-propyl, iso-propyl, n-butyl, i.
so-butyl, tert-butyl, sec-butyl, n
-Pentyl, iso-pentyl, tert-pentyl,
neo-pentyl, 1-methylbutyl, 2-methylbutyl, n-hexyl, 2-ethylbutyl, cyclohexyl, methoxy, ethoxy, n-propyloxy, iso
Each group of -propyloxy, each atom of F, Cl, Br, I and the like can be mentioned, but those having an alkyl group or an alkoxy group in R ² and / or R ⁶ are preferable. This is because a compound having an alkyl group or an alkoxy group in R ² and R ⁶ easily obtains a good complex refractive index (particularly high refractive index). When the number of carbon atoms in R ^{1 to} R ⁶ is greater than 10,
The absorbance per unit film thickness of the recording layer decreases, and it becomes difficult to obtain a good complex refractive index, which is not preferable.

The phthalocyanine compound (1) represented by the general formula (I) can be easily synthesized by a cyclization reaction of a corresponding phthalonitrile mixture. That is, a mixture of the following (III) and (IV) is, for example, 1,8-
It can be easily synthesized by heating and reacting the metal derivative with an alcohol in the presence of diazabicyclo [5,4,0] -7-undecene.

[Chemical 3]

[Chemical 4]

-QR ¹ in A ^{1 to} A ⁸ and the general formula (I
The ratio of the thiophenyl group represented by I) is 1/3 to 3
/ 1 is preferable, and it is more preferable to form the recording layer with a mixture of compounds having a ratio in this range. The ratio of -QR ¹ is increased tends to occur pit length deviation of the reproduced signal, the ratio of thiophenyl based group increases higher decomposition temperature of the dye, the recording sensitivity tends to decrease. Further, the use of the mixture improves the solubility of the dye and improves the film forming property of the recording layer .

Further, another group is added to the β-position of the benzene ring of the phthalocyanine skeleton for the purpose of improving the recording sensitivity, adjusting the absorption wavelength of the recording layer , improving the solubility in the coating solvent, and the like. Examples of such a group include a halogen atom, a nitro group, an alkyl group, an alkoxy group, an aryl group, an alkylthio group, a sulfonic acid group, and a sulfonic acid amine group.

The nitrogen-containing compound (2) selected from the optionally substituted or cyclized amino compound, imino compound and azo compound used in the present invention has -N = in the molecule.
Alternatively, it is a compound having a -N <group. Specific examples thereof include, but are not limited to, the following compounds. Among these, a compound containing an N atom in the heterocycle is preferable because it has a high effect of preventing association of the metal phthalocyanine compound and is excellent in durability (heat resistance and light resistance). Further, from the viewpoint of maintaining the thermal stability of the recording layer, the nitrogen-containing compound has a melting point of 1
It is preferably 50 ° C. or higher. Melting point 150
This is because when the temperature is lower than 0 ° C., the characteristics (especially optical characteristics) of the recording layer are likely to change in a high temperature and high humidity environment. Among them, particularly preferable are imidazole, benzimidazole and thiazole derivatives.

N-butylamine, n-hexylamine,
tert-butylamine, pyrrole, pyrrolidine, pyridine, piperidine, purine, imidazole, benzimidazole, 5,6-dimethylbenzimidazole, 2,
5,6-trimethylbenzimidazole, naphthimidazole, 2-methylnaphthimidazole, quinoline, isoquinoline, quinoxaline, benzquinoline, phenanthridine, indoline, carbazole, norharman,
Thiazole, benzthiazole, benzoxazole,
Benztriazole, 7-azaindole, tetrahydroquinoline, triphenylimidazole, phthalimide, benzisoquinoline-5,10-dione, triazine, perimidine, 5-chlorotriazole, ethylenediamine, azobenzene, trimethylamine, N, N-dimethylformamide, 1 ( 2H) phthalazinone, phthalhydrazide, 1,3-diiminoisoindoline, oxazole, polyimidazole, polybenzimidazole,
Polythiazole and the like.

In the film ( recording layer ) in which the compound (1) and the compound (2) are coordinate-bonded, two compounds are dissolved in a solvent,
It can be easily obtained by coating a substrate as a coating liquid. The mixing ratio of the compound (1) and the compound (2) is preferably in the range of 1/2 to 2/1 [ratio of compound (2) / compound (1)] in terms of molar ratio. The molar ratio is less than 1/2, for compound (2) Effect of can not be sufficiently obtained, because the dye concentration in the film becomes lower than 2/1 excess Conversely, serial
The absorbance per unit film of the recording layer is likely to decrease, and it becomes difficult to obtain a good complex refractive index (especially high refractive index).

In the recording layer of the present invention, the interaction (coordination bond) between the compound (1) and the compound (2), and the R of the compound (1).
The effect of ¹ to R ⁶ (especially R ² and R ^6), the molecule is hard to association of a compound (1), also the absorption peak wavelength of the recording layer (lambda
max) is 710 to 750n due to the electron effect of A ^{1 to} A ^8.
Since it is in the m range, the laser light wavelength range (760 to 800
(nm), it is possible to obtain the complex refractive index required for the write-once CD. Furthermore, it is considered that the pit length deviation of the reproduced signal is unlikely to occur due to the thermal decomposition characteristics of A ^{1 to} A ⁸ . Furthermore,
Another group may be added to the β-position of the benzene ring of the phthalocyanine skeleton for the purpose of improving recording sensitivity, adjusting the absorption wavelength of the recording layer , improving solubility in a coating solvent, and the like. Examples of such a group include a halogen atom, a nitro group, an alkyl group, an alkoxy group, an aryl group, an alkylthio group, a sulfonic acid group, and a sulfonic acid amine group.

As the recording layer material, in addition to the compound (1) and the compound (2), any dye conventionally known as a recording material for an information recording medium can be mixed and used. Examples of such dyes include cyanine dyes, pyrylium-based / thiopyrylium-based dyes, azulenium-based dyes, squarylium-based dyes, metal complex salt-based dyes such as Ni and Cr, naphthoquinone-based / anthraquinone-based dyes, indophenol-based dyes, Examples thereof include indoaniline type dyes, triphenylmethane type dyes, triallylmethane type dyes, aminium type / diimmonium type dyes and nitroso compounds. Further, if necessary, other third component such as binder, stabilizer and the like can be contained. The thickness of the recording layer is 100 to 5000.
Å is preferable, and 500 to 3000 Å is particularly preferable. Record
This is because if the thickness of the recording layer is smaller than this range, the recording sensitivity is lowered, and if it is thicker, the reflectance is lowered.

The substrate used in the present invention can be arbitrarily selected from various materials used as substrates for conventional information recording media. Examples of substrate materials include
Examples thereof include acrylic resins such as polymethylmethacrylate, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymer, epoxy resins, polycarbonate resins, amorphous polyolefins, polyesters, glasses such as soda lime glass, and ceramics. In particular, from the viewpoint of dimensional stability, transparency and flatness, polymethyl methacrylate, polycarbonate resin, epoxy resin, amorphous polyolefin, polyester, glass and the like can be mentioned.

An undercoat layer may be provided on the surface of the substrate on which the recording layer is provided for the purpose of improving flatness, improving adhesive strength and preventing alteration of the recording layer . Examples of the material of the undercoat layer include polymethylmethacrylate and acrylic acid /
Methacrylic acid copolymer, styrene / maleic anhydride copolymer, polyvinyl alcohol, N-methylol acrylamide, styrene / sulfonic acid copolymer, styrene / vinyltoluene copolymer, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride Polymer substances such as chlorinated polyolefins, polyesters, polyimides, vinyl acetate / vinyl chloride copolymers, ethylene / vinyl acetate copolymers, polyethylene, polypropylene, polycarbonates: Organic substances such as silane coupling agents: Inorganic oxides Inorganic substances such as (SiO ₂ , Al ₂ O ₃ etc.) and inorganic fluorides (MgF ₂ ) can be mentioned. The layer thickness of the undercoat layer is generally in the range of 0.005 to 20 μm, preferably 0.01 to 10 μm.

A pregroup layer may be provided on the substrate (or undercoat layer) for the purpose of forming a groove for tracking or an unevenness representing information such as an address signal. As the material for the pregroup layer, a mixture of at least one monomer (or oligomer) of acrylic acid monoester, diester, triester, and tetraester and a photopolymerization initiator can be used.

Further, a reflective layer may be provided on the recording layer for the purpose of improving the S / N ratio, reflectance and sensitivity during recording. The light-reflecting substance that is the material of the reflecting layer is a substance having a high reflectance for laser light, and examples thereof include Mg, Se, Y, Ti, Zr, Hf, V and N.
b, Ta, Cr, Mo, W, Mn, Re, Fe, Co,
Ni, Ru, Rh, Pd, Ir, Pt, Cu, Ag, A
u, Zn, Cd, Al, Ca, In, Si, Ge, T
Metals and semimetals such as e, Pb, Po, Sn and Si can be mentioned. Of these, preferred is A
u, Al and Ag. These substances may be used alone or in combination of two or more or as an alloy. The layer thickness of the reflective layer is generally 100 to 30.
It is in the range of 00Å. Further, the reflective layer may be provided between the substrate and the recording layer, and in this case, information recording / reproduction is not performed.
It is performed from the recording layer side (the side opposite to the substrate).

Further, on the recording layer (or reflecting layer), the serial
A protective layer may be provided for the purpose of physically and chemically protecting the recording layer and the like. This protective layer may be provided on the side of the substrate on which the recording layer is not provided for the purpose of enhancing scratch resistance and moisture resistance. Examples of materials used for the protective layer include
Inorganic substances such as Si, O, SiO ₂ , MgF ₂ and SnO ₂
A thermoplastic resin, a thermosetting resin, and a UV curable resin can be mentioned. The thickness of the protective layer is generally 500.
It is in the range of Å to 50 μm.

Next, a method of manufacturing the optical recording medium of the present invention will be described. The method for producing an optical recording medium of the present invention comprises a metal phthalocyanine compound represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on the surface. A recording layer containing (1) and the nitrogen-containing compound (2) as main components is provided by coating film forming means, and a light reflection layer is provided thereon by vacuum film forming means directly or through another layer. It is characterized in that a protective layer is provided thereon. That is, the manufacturing method of the present invention comprises the following steps. (A) A metal phthalocyanine compound (1) represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on its surface.
And a step of providing a recording layer containing the above-mentioned nitrogen-containing compound (2) as a main component by coating film forming means, (b) providing a light reflecting layer on the recording layer directly or via another layer by vacuum film forming means. And (c) providing a protective layer on the recording layer .

( Recording Layer Forming Step) In the method of the present invention, first, information pits and / or
Alternatively, a recording layer containing the metal phthalocyanine compound (1) and the nitrogen-containing compound (2) as main components is formed on the substrate having the guide groove formed directly or through another layer by coating and forming means. Provided by. That is, the recording according to the present invention
The layer comprises a film in which the phthalocyanine compound (1) and the nitrogen-containing compound (2) are coordinate-bonded, and the recording layer dissolves the above two compounds and coats it on the substrate as a liquid coating solution. Therefore, it can be easily obtained. As a solvent for adjusting this coating solution, a known organic solvent (for example, alcohol, cellosolve, carbon halide, ketone,
Ether, etc.) can be used. As the coating method, the spin coating method is preferable because the layer thickness can be controlled by adjusting the concentration and viscosity of the recording layer and the drying temperature of the solvent.

An undercoat layer is provided on the surface of the substrate on which the recording layer is provided for the purpose of improving the flatness of the substrate surface, improving the adhesive strength, and preventing alteration of the recording layer . The undercoat layer in this case is prepared by, for example, dissolving or dispersing the above-mentioned undercoat layer substance in a suitable solvent to prepare a coating solution, and then applying the coating solution by spin coating, dip coating, extrusion coating or the like. Can be formed by applying to the surface of the substrate.

(Light-Reflecting Layer Forming Step) In the method of the present invention, a light-reflecting layer is then provided on the recording layer directly or via another layer by a vacuum film forming means.
That is, the light reflecting layer is formed on the recording layer by, for example, vapor deposition, sputtering or ion plating of the above-mentioned light reflecting substance.

(Protective Layer Forming Step) In the method of the present invention, a protective layer is provided on the light reflecting layer. That is, it is formed by vacuum film formation or application film formation of the protective layer material made of the above-mentioned inorganic substance or various resins. In particular, it is preferable to use a UV curable resin, which is formed by spin coating the resin and then irradiating it with ultraviolet rays to cure it.

[0031]

The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 A substrate having a guide groove concavo-convex pattern having a depth of about 1400Å on the surface of a polycarbonate disk having a diameter of 120 mm and a thickness of 1.2 mm was prepared, and is represented by (1)-in Table 1 below. Spin coating a recording layer comprising a coordination bond of a phthalocyanine compound and 5,6-dimethylbenzimidazole [compound (1)-] with a mixed solvent of tetrahydrofuran, 2-butoxyethanol and methylcyclohexane as a coating liquid. Provided by. In the phthalocyanine compound (1)-, the ratio of phthalonitrile having A to phthalonitrile having A '(A / A' =
1/1) and mixed with 1,8-diazabicyclo [5,4,4]
[0] -7-undecene and metal chloride were added and the reaction was carried out by heating in 1-pentanol. Moreover, the mixing ratio of the compound (1)-and the compound (1)-was set to 1.5 in terms of a molar ratio [compound (1)-/ compound (1)-].
Λmax of the formed recording layer was 725 nm. The film thickness of the recording layer was about 1500Å. Au was formed on the recording layer by Au sputtering to a thickness of about 800 Å to form a reflective layer, and a protective layer made of an ultraviolet curable resin was further formed on the recording layer to a thickness of about 5 μm to provide the optical recording medium of the present invention. Obtained.

The obtained optical recording medium has a wavelength of 785 nm,
N. A. When the EFM signal was recorded and reproduced under the conditions of 0.5 and a linear velocity of 1.2 m / s, the reflectance (Itop) was 67%,
The C1 error was 220 or less. Furthermore, when the pit length of the reproduced signal was measured using an interval analyzer, the pit length deviation from the standard CD (Test5B) was 40 ns or less, which was a value satisfying the write-once CD standard (Orange Book).

Examples 2 to 10 The optical recording medium of the present invention was prepared under the conditions (2) to (10) in Table 1- (1) below, and evaluated in the same manner as in Example 1. The results are as shown in Table 1- (2), and the λmax of the recording layer is 710 to 710.
It was in the range of 750 nm, and itop, C1 error, and pit length deviation satisfied the write-once CD standard.

Comparative Examples 1 to 4 Comparative optical recording media were prepared under the conditions (11) to (14) in Table 2- (1) below and evaluated in the same manner as in Example 1. The results are shown in Table 2- (2), and the λmax of the recording layer is 710.
Although it was in the range of 750 nm, the reproduction signal characteristics were write-once type C
It was not possible to satisfy the D standard. In particular, the pit length deviation was -60 ns or less for 11T pits for the samples (11) to (14), which was outside the standard.

[0036]

[Table 1- (1)]

[0037]

[Table 1- (2)]

[0038]

[Table 2- (1)]

[0039]

[Table 2- (2)]

[0040]

According to the optical recording medium of claim 1, the main component of the recording layer is a coordination bond of the metal phthalocyanine compound (1) represented by the general formula (I) and the nitrogen-containing compound (2). Since it is configured as, excellent signal characteristics,
Reproduction error is unlikely to occur and light resistance is excellent.

Since the optical recording medium according to claim 2 uses an imidazole, a benzimidazole or a thiazole derivative as the nitrogen-containing compound (2),
The effect of further improving durability (light resistance, heat resistance) is added.

In the optical recording medium of claim 3, R ² of the phthalocyanine compound represented by the general formula (I) is
Since it is selected from methyl, ethyl, n-propyl, iso-propyl, methoxy, ethoxy, n-propyloxy, and iso-propyloxy, the effect of easily obtaining a good complex refractive index is added.

According to the optical recording medium of claim 4, since the light absorption peak wavelength of the recording layer is in the range of 710 to 750 nm, an appropriate complex refractive index can be more reliably obtained at the laser light wavelength. The effect is added.

A method of manufacturing an optical recording medium according to claim 5 is a recording method.
Since the layer is formed by the coating film forming means and the light reflecting layer is formed by the vacuum film forming means, the optical recording medium of the present invention can be easily and stably manufactured.

─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP 59-67093 (JP, A) JP 4-131280 (JP, A) JP 7-32737 (JP, A) JP 7- 70458 (JP, A) JP-A-2-39989 (JP, A) JP-A-4-348168 (JP, A) JP-A-4-273879 (JP, A) JP-A-4-226388 (JP, A) JP-A-1-108265 (JP, A) JP-A-2-43091 (JP, A) JP-A-8-290665 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B41M 5/26 CAPLUS (STN) REGISTRY (STN)

Claims (5)

(57) [Claims] 1. An optical recording medium having at least a recording layer provided on a substrate, wherein the recording layer is substituted or cyclized with a metal phthalocyanine compound (1) represented by the following general formula (I). An optical recording medium comprising a coordination bond with a nitrogen-containing compound (2) selected from a good amino compound, imino compound and azo compound as a main component. [Chemical 1] (In the formula, M and A ^{1 to} A ⁸ each represent the following: M: at least one divalent selected from Mn ²⁺ , Fe ²⁺ , Co ²⁺ , Zn ²⁺ and Cd ^2+. Metal atoms of A ¹ and A ² , A
³ and A ⁴ , A ⁵ and A ⁶ and A ⁷ and A ⁸ : one of each is —QR ¹ or a thiophenyl group represented by the following general formula (II), and the other is a hydrogen atom or a halogen atom,
And -QR ¹ or the following general formula (II) thiophenyl system group represented by each of at least one perforated. Q: O
Or S atom. General formula (II): R ¹ : a linear, branched or cyclic alkyl group having 4 to 10 carbon atoms. R ^{2 to} R ⁶ : each independently a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms or 1 to 3 carbon atoms
The alkoxy group. ) 2. The optical recording medium according to claim 1, wherein the nitrogen-containing compound (2) is an imidazole, a benzimidazole or a thiazole derivative. 3. R ² of the phthalocyanine compound represented by the general formula (I) is selected from methyl, ethyl, n-propyl, iso-propyl, methoxy, ethoxy, n-propyloxy and iso-propyloxy. The optical recording medium according to claim 1, which is one base. 4. The optical recording medium according to claim 1, wherein the recording layer has a light absorption peak wavelength (λmax) in a range of 710 to 750 nm. 5. Substitution with a metal phthalocyanine compound (1) represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on the surface thereof. Alternatively, a recording layer containing, as a main component, a coordination bond with a nitrogen-containing compound (2) selected from an optionally cyclized amino compound, imino compound and azo compound is provided by coating and film formation means, and 5. The optical recording medium according to any one of claims 1 to 4, wherein a light reflecting layer is provided directly on or through another layer by a vacuum film forming means, and a protective layer is further provided thereon. Production method.