JP2003118232A - Optical information recording medium and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical information recording medium in which the interchangeability with a CD reproducer is enhanced even in high-speed recording. SOLUTION: The optical information recording medium comprises a recording layer containing an organic dye capable of writing information by a laser beam, a reflecting layer and a protective layer sequentially provided on a substrate in such a manner that the recording layer dye is dissolved and coated with at least two types of mixed solvents containing a nonpolar organic solvent (1) having a solubility parameter of 8.5 or less which does not substantially dissolve a polycarbonate substrate and an organic solvent (2) having a higher boiling point and higher viscosity coefficient than those of the solvent (1) and containing an aromatic ring which substantially dissolves the polycarbonate substrate and with a mixing ratio of the organic solvent (1) of 90 to 99 vol.% to the entire coating solvent, and then the reflecting layer and the protective layer are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium and its manufacturing method.

[0002]

2. Description of the Related Art With the recent rapid progress of information society,
The use and research of optical information recording media capable of significantly higher density recording than magnetic recording media have been actively conducted. As the optical information recording medium, a read-only type in which information is recorded in advance and can only be reproduced, a write-once type in which information can be recorded and reproduced by a user, and information recording / reproduction /
A rewritable type that can be erased is known. Among them, the write-once type is generally cheap and excellent in storability, so that it is widely used as a medium for storing a large amount of data compactly.

This write-once type optical information recording medium is a single-plate type CD-R (CD, in which an organic dye is used as a recording layer, a metallic reflecting layer is provided on the recording layer, and a protective layer is further provided thereon. -R
ECORABLE) or a tension-type DVD-R (DVD-
Recordable) is common and widely used.

This CD-R or DVD-R is for recording information as a signal by changing the organic dye recording layer by laser light emitted from the substrate side, and as a recording device, a high output semiconductor laser is used. Various writers used and software for recording information are commercially available. In recent years, with regard to CD-R recording devices, a large number of devices for recording at a speed as high as 16 to 24 times higher than a normal recording speed have been commercially available. Also, with respect to DVD-R, a device for recording at a high speed of 4 times or more is becoming commercially available.
When recording at a high speed, recording is performed in a shorter time than the normally used writing time, but laser irradiation with higher power is required, so that the margin required for the recording / reproducing characteristics is further narrowed. In particular, it has been pointed out that the jitter characteristics and the block error rate, which have not been revealed at a normal recording speed, increase.

On the other hand, for example, Japanese Patent Laid-Open No. 6-3380.
59, etc., by defining the groove depth of the substrate and the amount of deformation of the recording layer by laser light,
There are examples that mainly improve the jitter characteristics. The system is characterized by partially controlling the decomposition of the organic dye used in the recording layer. For example, when a phthalocyanine dye is used as the recording layer, it is not necessary to change the substrate structure such as the groove depth of the substrate. It was difficult to control the decomposition of the dye, and thus it was difficult to reduce the jitter characteristics. Further, as described in JP-A-6-208732, by using a silver-palladium alloy for the reflective layer, cracking and peeling between the reflective layer and the recording layer caused by dye decomposition during recording can be suppressed to improve jitter characteristics. Attempts to let it happen have been reported. Although the system is effective for high-speed recording of about 2 × speed and 4 × speed, it is not always possible to improve sensitivity to further high speed recording of 16 × speed, 24 × speed or more, which is commercially available recently, and block error and jitter The present inventors have observed that the characteristics cannot be improved.

It has also been reported that the selection of the coating solvent for the recording layer improves the sensitivity of the recording layer, the S / N ratio, and expands the recording margin. For example, Japanese Patent Laid-Open No. 62-
41085, USP-5,959,960, WO-20
It is described that 0,049,611 and the like improve the characteristics by using a two-component system organic solvent and a system in which the second component solvent is a high boiling point solvent. However, these prior art documents are intended to control the sensitivity and uniformity of the dye simply by adding the second component solvent having a high boiling point.
It has been found by the present applicants that the increase in the jitter characteristic and the block error rate at the time of high speed recording of 4 × speed or more cannot be suppressed.

[0007]

DISCLOSURE OF THE INVENTION As described above,
In the conventionally developed optical information recording medium, improvement of sensitivity at the time of high-speed recording, reduction of block error rate, and reduction of jitter characteristics are not always sufficient, and therefore, a typical example of the CD- In R medium, when writing at high speed recording of 24 times speed, 32 times speed or more,
The compatibility with playback-only CDs was not always sufficient, and there were cases where playback was difficult with popular CD players on the market. SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and provide an optical information recording medium having improved compatibility with a CD player even at high speed recording.

[0008]

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the second added solvent is higher than the main solvent in the solvents used for coating the recording layer. A combination of organic solvents that have a high boiling point and high viscosity, and that substantially dissolve the polycarbonate substrate, controls the dye film thickness in the groove and land to form a thin film without lowering sensitivity and modulation. It was also found that the hard part layer on the surface of the polycarbonate substrate was appropriately roughened to improve the adhesion at the interface between the polycarbonate substrate and the dye layer. Furthermore, as a result, it was found that there was a marked effect in reducing the jitter and block error rate during high-speed recording. In particular, it is particularly preferable to use a solvent having an aromatic ring as the second added solvent, in particular a linear velocity of 28.8 m / se.
It was found that a remarkable effect was exhibited at the time of high-speed recording of c or more, and the present invention was achieved.

That is, the optical information recording medium and the manufacturing method thereof according to the present invention are as follows.

In an optical information recording medium in which a recording layer, a reflective layer, and a protective layer made of an organic dye capable of writing information by laser light are provided in this order on a substrate, the recording layer dye is substantially a polycarbonate substrate. Non-polar organic solvent with a solubility parameter of 8.5 or less (1)
And (2) at least two kinds of mixed solvents each containing an organic solvent (2) having a higher boiling point and higher viscosity than (1) and having an aromatic ring that substantially dissolves the polycarbonate substrate, In addition, the non-polar organic solvent (1) is dissolved and coated at a mixing ratio of 90 to 99% by volume with respect to the entire coating solvent, and then the optical information recording medium on which the reflective layer and the protective layer are formed, and the manufacturing method thereof. is there. In particular, the present invention relates to an optical information recording medium in which the recording layer dye can record at a linear velocity of 28.8 m / sec or more. Further, the present invention relates to an optical information recording medium characterized in that the nonpolar organic solvent (1) has a saturated alicyclic hydrocarbon system, and a method for producing the same. The boiling point of the organic solvent (2) is 140 ° C (1
01325 Pa) or higher and a viscosity of 0.6 cP (20
C.) or higher, and a method for manufacturing the same. Further, the present invention relates to an optical information recording medium characterized in that the groove groove depth provided on the substrate is 180 nm or more, and a manufacturing method thereof. The organic solvent (2) is m) trimethylbenzene, o) tetralin,
The present invention relates to an optical information recording medium selected from any one of p) butylbenzene, q) cymene, r) cumene, and s) xylene, and a manufacturing method thereof. The present invention also relates to an optical information recording medium in which the recording layer is a non-polar solvent-soluble phthalocyanine dye, and further a halogenated phthalocyanine dye, and a method for producing the same.

The optical information recording medium of the present invention and the method for manufacturing the optical information recording medium will be described in detail below. The structure of the optical recording medium of the present invention is a write-once CD or DVD-R.
Is basically the same as That is, a recording layer that absorbs laser light to form pits is provided on a transparent substrate with pregrooves (guide grooves) formed as necessary, and the reflectance is increased on the recording layer. A reflective layer for protecting the recording layer and the reflective layer is further provided thereon.
The protective layer may have a two-layer laminated structure as an adhesive layer. As a material of the substrate, a polycarbonate resin is particularly used as a material that substantially transmits the light of the semiconductor laser and is used for an ordinary optical recording medium. If necessary, a polycarbonate resin is formed by injection molding, or a 2P method is used to form a pregroove-formed substrate. The shape of these substrates may be plate-like, film-like, circular or card-like. Further, the substrate surface may have a guide groove for indicating a recording position, a pit for indicating a recording position, and a pit for partially reproducing only information.

The recording layer is a substance which absorbs a recording laser beam to cause a physical and / or chemical change, and which can be read by a reproducing laser beam, has absorption in a semiconductor laser wavelength range, and Basically, any organic dye may be used as long as it is an organic dye soluble in a non-polar solvent. That is, phthalocyanine dyes, naphthalocyanine dyes, cyanine dyes, squarylium dyes, pyrylium dyes, thiopyrylium dyes, azurenium dyes, naphthoquinone dyes, anthraquinone dyes,
Metal salt dyes such as Ni and Cr, indophenol dyes, triphenylmethane dyes, xanthene dyes, indanthrene dyes, indigo dyes, thioindigo dyes, merocyanine dyes, thiazine dyes, acridine dyes , Oxazine dyes, azo dyes and the like. Of these, phthalocyanine dyes are preferable because of their high light resistance and durability.

Particularly, as the phthalocyanine dye used in the present invention, for example, alkyl-substituted phthalocyanine,
Examples thereof include alkoxy-substituted phthalocyanines, alkylthio-substituted phthalocyanines, trialkylsilyl-substituted phthalocyanines, and halogenated phthalocyanines thereof. Among them, alkoxy-substituted phthalocyanines and halogenated phthalocyanines are preferable. This substituted phthalocyanine dye may be used alone, or two or more types of dyes may be mixed and used. Further, if necessary, an additive substance such as an ultraviolet absorber, a singlet oxygen quencher, a metal compound, a binder can be added.

The phthalocyanine dye used in the present invention is usually formed into a film by a spin coat method. A non-polar organic solvent (1) having a solubility parameter of 8.5 or less, which does not substantially dissolve the polycarbonate substrate, which is an injection-molded substrate, when the dye is formed into a film by spin coating; It is necessary to use at least two kinds of mixed solvents each having an organic solvent (2) having a higher boiling point and a higher viscosity and having an aromatic ring that substantially dissolves the polycarbonate substrate. if,
If the organic solvent (2) having an aromatic ring is not added, not only the recording layer cannot be thinned, but also the interface strength between the hard layer on the surface of the polycarbonate substrate and the recording layer dye cannot be sufficiently increased. Particularly, at the time of high-speed recording with a linear velocity of 28.8 m / sec or more, good jitter and block error rate cannot be maintained. On the contrary, if the non-polar organic solvent (1) is not added, the recording layer dye cannot be sufficiently dissolved and a uniform coating film formation cannot be achieved, and only the organic solvent (2) is necessary for the polycarbonate substrate. It goes without saying that the above-mentioned damage is given and a good film cannot be formed.

Non-polar organic solvent (1) having a solubility parameter of 8.5 or less, which does not substantially dissolve the polycarbonate substrate.
Is, for example, pentane, n-hexane, isohexane, n
-Heptane, n-octane, isooctane, nonane, decane, 2-methylhexane, 3-methylhexane, 3-
Methyl pentane, 2,3-dimethyl pentane, 2,4-
Dimethyl pentane, 3,3-dimethyl pentane, 2,3
-Dimethylbutane, 2,2,3-trimethylpentane,
Saturated aliphatic hydrocarbons such as 2,2,4-trimethylpentane and 2,2,3,3-tetramethylbutane, pentene,
Hexene and its isomers, hexadiene and its isomers, hexatriene, heptene and its isomers, heptadiene and its isomers, heptatriene, octene and its isomers, octadiene, octatriene, nonene,
Unsaturated aliphatic hydrocarbons such as nonadiene, nonatriene, decene, undecene, dodecene, cyclohexane, methylcyclohexane, dimethylcyclohexane, ethylcyclohexane, diethylcyclohexane, isopropylcyclohexane, cycloheptane, cyclopentane, methylcyclopentane, dimethylcyclopentane, ethyl Saturated cycloaliphatic hydrocarbons such as cyclopentane, diethylcyclopentane, isopropylcyclopentane, cyclooctane, cyclopentene, cyclopentadiene, cyclohexene, methylcyclohexene, dimethylcyclohexene, ethylcyclohexene, cyclohexadiene, methylcyclohexadiene, cycloheptene, etc. Saturated alicyclic hydrocarbon system, diethyl ether, dibutyl ether, diisobutyl ether Ether, Jipuropirue - ether, diisopropyl et - ether, chain et such dipentyl ether -
A non-polar solvent such as tellurium can be used. These organic solvents may be used alone or in combination of two or more.
Among these organic solvents, particularly saturated alicyclic hydrocarbons having extremely good compatibility with phthalocyanine dyes, for example, cyclohexane, methylcyclohexane, dimethylcyclohexane, ethylcyclohexane, diethylcyclohexane,
It is preferable to use isopropylcyclohexane, cycloheptane, cyclopentane, methylcyclopentane, dimethylcyclopentane, ethylcyclopentane, diethylcyclopentane, isopropylcyclopentane, cyclooctane and the like. The solubility parameter in the present invention means σ = [(ΔH-RT) / ^VL ] ^1/2 [where σ: solubility parameter, ΔH: heat of vaporization, ^VL : molar volume] The value obtained by the formula is △ H is Hidebrand
Calculated from the boiling point according to the rule. ΔH ₂₉₈ = 23.7T
b + 0.020Tb ² −2950 (however, T
b: boiling point). Therefore, the solubility parameter is also 298
The value is ° K. Specific examples of the solubility parameter whose boiling point is determined by the Hidebrand rule are partially described in, for example, Solvent Handbook, pages 62 to 63, published by Teruzo Asahara, published by Kodansha. For the calculation method of solubility parameter by Hide brand rule, see JH Hildebran
d, "Solubility of Nonelectrolytes" 424-427
(1950), Reinhold Publishing Co.

The organic solvent (2) having a higher boiling point and higher viscosity than (1) and having an aromatic ring which substantially dissolves the polycarbonate substrate is, for example, benzene, methylbenzene, styrene, ethylbenzene, Butylbenzene, cumene, diethylbenzene, trimethylbenzene,
Examples include triethylbenzene, tetralin, cymene, xylene and the like. Among them, the boiling point is 140 ° C (1013
25 Pa) or more and a viscosity of 0.6 cP (20 ° C)
Butylbenzene, trimethylbenzene, triethylbenzene, tetralin, p-cymene, cumene, having the above
Xylene has a sufficient leveling function for the substrate groove (groove), and since it has a high boiling point, it remains for a long time in the recording layer dye after spin coating and before the drying process, and the substrate surface becomes hard over time. It becomes possible to dissolve / roughen the layers appropriately. Further, from the viewpoints of production cost, easiness of production, etc., the organic solvent (2) is preferably the following.

[0017]

[Chemical formula 1] t) Mesitylene

[0018]

Embedded image u) tetralin

[0019]

Embedded image v) n-butylbenzene

[0020]

[Chemical formula 4] w) p-cymene

[0021]

[Chemical 5] x) Cumene

[0022]

[Chemical formula 6] y) Pseudocumene

[0023]

Embedded image z) O-xylene

In the present invention, it is preferable that the organic solvent (1) is mixed and coated with the dye solution at a mixing ratio of 90 to 99% by volume with respect to the entire coating solvent. This mixing ratio is
It has a sufficient compatibility between the dye and the mixed solvent, and has a sufficient leveling function for the substrate grooves as described above, and also appropriately dissolves the hard layer on the substrate surface.
It is calculated as the optimum mixing ratio that can be vandalized.

In the present invention, when the dye is coated using the above mixed solvent, the groove depth of the substrate is 180 n.
It is preferable to use a substrate of m or more. With this film thickness design, good jitter and block error rate can be maintained during high-speed recording with a recording linear velocity of 28.8 m / sec or more, and sufficient sensitivity, modulation degree, and appropriate PushP
It is possible to keep the ull. Substrate groove shape can be measured by optical method, cross-section SEM, STM, AFM
However, in this patent, the measurement by AFM is adopted.

After forming the recording layer, a drying step may be provided if necessary. From the viewpoint of the productivity of the medium and the stability of the recording signal characteristics of the medium, the drying time is preferably 50 ° C. or more and 100 ° C. or less. It is considered that when the recording layer is dried at 50 ° C. or higher, the stress remaining on the substrate and the recording layer is sufficiently relaxed. The drying time is usually about 15 minutes to 25 hours. On the other hand, the pressure during drying may be normal pressure or reduced pressure. A reflective layer is provided on the recording layer in the present invention. The reflective layer may be a film having a heat insulating function, a light enhancing function and the like in addition to the reflecting function. In such a case, the reflective layer may be a multilayer of two or more layers. Specific examples of the reflective layer include aluminum, gold, silver, copper, platinum, nickel and the like, and alloys containing these metals as one component. The film thickness of the reflective film is usually about 20 to 200 nm. Further, an inorganic film such as aluminum oxide, silicon oxide, silicon nitride, aluminum nitride, boronitride, magnesium fluoride, or silicon carbide may be provided in the second layer as a heat insulating function and a light enhancing function. A protective layer is provided on the reflective layer in the present invention. The protective layer is not particularly limited as long as it can protect the recording film and the reflective film. For example, polycarbonate, acrylic,
Polymer materials such as polystyrene, vinyl chloride, epoxy, polyester, or SiO ₂ , Al ₂ O ₃ , Al
Inorganic substances such as N can be used. Among them, the ultraviolet curable acrylic resin is preferable because it can easily form the protective layer. These may be used alone or in combination. Also, two or more kinds may be used as a multi-layer film by stacking them.

The optical recording medium of the present invention irradiates laser light through the substrate to record and reproduce signals. At this time, in the case of CD-R, a semiconductor laser having an oscillation wavelength of 770 to 830 nm is used. In consideration of compatibility with a CD player, recording / reproducing is generally performed by a semiconductor laser having a wavelength of 770 to 830 nm. However, since the phthalocyanine dye has a large absorption in the range of 640 to 740 nm, in particular, in recording / reproducing, in addition to the wavelength range of 770 to 830 nm which is the recording / reproducing wavelength of CD-R, 400 to
Recording can also be performed at high speed in a short time on a 600 nm blue semiconductor laser.

The qualitative and quantitative determination of the coating solvent in the recording layer is usually carried out by headspace GC / MS or ion selective GC / MS.
(SIM GC / MS), GC / MS measurement by solvent extraction, and the like. GC / MS measurement by solvent extraction,
In SIM GC / MS, after the reflective layer and the protective layer are peeled off, extraction is performed with a solvent different from the coating solvent in the recording layer.
Further, the head space GC / MS can be quantitatively analyzed by gas chromatography by heating in a sealed system to expel the coating solvent gas without peeling off the reflective layer and the protective layer.

The inventor of the present invention reduces the dye film thickness of the recording layer, particularly the land film portion of the substrate groove which is not scanned by the laser, so as to reduce the jitter characteristic and the block error rate especially at the high speed recording of 24 times or more. It has been found that the increase can be suppressed. Furthermore, the present inventors have found out that this factor is due to peeling at the interface between the recording layer dye and the polycarbonate substrate. It has been found that this phenomenon is prominent especially in high-speed recording in which recording is performed at high power and / or when the recording layer dye is a non-polar phthalocyanine dye having a symmetric structure. In order to solve this problem, measures have been taken to reduce the dye film thickness of the land portion of the substrate groove where laser scanning is not performed, but on the other hand, if the dye film thickness of the land portion is simply thinned, The dye film thickness of the laser scanning portion (groove portion) is also thinned at the same time, and the recording sensitivity or the modulation degree is lowered, or the PushPull is increased, which causes serious defects in recording and reproduction. I also understood that.

In order to solve this problem, how the adhesion between the recording layer dye and the polycarbonate substrate is closely controlled while controlling the dye film thickness of the laser scanning portion (groove portion) of the substrate groove and the land portion not laser scanning. How to improve sex became an important issue. In order to overcome this problem, the present inventors have attempted a method of appropriately roughening the hard layer on the substrate surface by some means in addition to the film thickness of the recording layer dye. As a result of various studies, it was found that the use of an organic solvent that substantially dissolves the polycarbonate substrate contributes to the roughness of the hard layer on the substrate surface and contributes significantly to the adhesion between the substrate and the dye layer. It was understood by the inventors. The point of using an organic solvent that substantially dissolves a polycarbonate substrate is also described in JP-A-4-332930, but the concept for exerting the effect, and the relationship between the vapor pressure of the solvent used and the substrate solubility are described in the present invention. Is clearly different from the range of the above, and the effect is also completely different. Hereinafter, the present invention will be specifically described with reference to Examples.
The embodiment of the present invention is not limited to this.

[0031]

EXAMPLES Example 1 As a recording dye, JP-A-03-6
200 g of a phthalocyanine dye (A) represented by the following structural formula synthesized according to
p. 131.8 ° C .: viscosity 0.76) 9.6 L, mesitylene (bp 164.7 ° C .: viscosity 1.15)
4 L was added and dissolved in 10 L of mixed solution to prepare a coating solution. Further, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 m) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm).
m, thickness 1.2 mm) was spin-coated at a rotation speed of 1300 rpm to form a recording layer so that the absorbance was Abs = 0.50. Next, after the substrate and the coated recording layer were sufficiently blended, the substrate on which this recording layer was formed was dried at 80 ° C. for 2 hours to remove the residual solvent in the dye. Further, Ag was sputtered on the recording layer to a film thickness of 60 nm to form a reflective layer. An ultraviolet curable resin SD-1700 (manufactured by Dainippon Ink and Chemicals, Inc.) was spin-coated on the reflective layer, and then irradiated with ultraviolet rays to be cured to a thickness of 6 μm.
m protective layer was formed.

[0032]

[Chemical 8] ... (A)

The CD-R medium thus produced was
An optical disk evaluation device DDU-1000 (Pulstec Industrial Co., Ltd.) was used for recording at a linear velocity of 28.8 m / s (EFM recording) using an optical disk recording device (laser wavelength 780 nm, NA = 0.5) manufactured by Sanyo Co., Ltd. Manufactured, laser wavelength 781 nm, NA = 0.45; using a commercially available CD player equipped optical head), the jitter, block error rate, and modulation factor are LJM.
-1851 Jitter Meter (Leader Electronics), Kenwood CD-Decoder: DR3552, Hitachi D
IGITAL STORAGE OSCILLOSCOP
The measurement was performed using an EVC-6100 and a TIA-175 timing interval analyzer manufactured by ADC.
For PushPull, an unrecorded product was directly evaluated by an optical disk evaluation device DDU-1000 (manufactured by Pulstec Industrial Co., Ltd., laser wavelength 781 nm, NA = 0.45; using an optical head equipped with a commercially available CD player). The evaluation results are shown in Table 2. In Example 1, the recording laser power was 30.5 mW.
The block error rate and jitter have the best values, and the block error rate at that time is 5 cps or less, 3
T pit (shortest pit) and 3T land (shortest land)
The jitter was 26 ns and 28 ns, respectively. The modulation degree of 11T pit (longest pit) is I11 / Ttop.
= 0.62, PushPull before recording is PPb = 0.
It was 12. Recording and reading could be performed very well with 24 times speed and high speed recording characteristics, and compatibility with various CD players was very good.

Example 2 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C .: Viscosity 0.76) 9.8 L, tetralin (bp. 207.7 ° C .: viscosity 2.02) 0.2 L were added to the mixed solution 10 L to prepare a coating solution.
Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 1. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 1 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Ray
The best results were obtained for the block error rate and jitter under the recording conditions of the power-30.5 mW. The block error rate was 5 cps or less, the jitter was 3T pits was 30 ns, and the 3T land was 3T land. It was 31 ns. Also, 1
The modulation degree of 1T pit was I11 / Ttop = 0.62, and PushPull before recording was PPb = 0.10. 24
The double-speed and high-speed recording characteristics enabled very good recording and reading, and the compatibility with each CD player was also very good.

Example 3 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C: viscosity 0.79) 9.6L, n-butylbenzene (bp 183.3 ° C: viscosity 1.03)
A coating solution was prepared by dissolving in 10 L of mixed solution containing 0.4 L. Further, this coating solution was applied to a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 n
m) Polycarbonate injection molded substrate (outer diameter 12
0 mm, thickness 1.2 mm), spin coating was carried out in the same manner as in Example 1, and then a reflective layer was formed in the same manner as in Example 1.
A protective layer was formed to make a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.5 mW, the best values of the block error rate and the jitter are obtained, the block error rate is 5 cps or less, the jitter is 3T, the pit is 28 ns, and the 3T is 3T. The land was 30 ns. The modulation degree of 11T pits is I11 / Ttop = 0.
61, PushPull before recording was PPb = 0.12. The 24x speed and high speed recording characteristics enabled very good recording and reading, and the compatibility with various CD players was also very good.

Example 4 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C .: Viscosity 0.76) 9.8 L, p-cymene
(Bp 177.1 ° C .: Viscosity 3.4) Dissolved in 10 L of mixed solution containing 0.2 L to prepare a coating solution. Further, this coating solution was used as a spiral groove (pitch 1.
6 μm, groove width of 0.6 μm, groove depth of 180 nm) was spin-coated on a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) in the same manner as in Example 1, and then as Example 1. Similarly, a reflective layer and a protective layer were formed to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Laser power-30.5mW recording condition block error
The best values of jitter and jitter were obtained, the block error rate was 5 cps or less, and the jitter was 28.5 ns for 3T pit and 29 ns for 3T land. Also,
The modulation degree of 11T pit was I11 / Ttop = 0.64, and PushPull before recording was PPb = 0.09. Two
The quadruple speed and high speed recording characteristics enabled extremely good recording and reading, and the compatibility with various CD players was also very good.

Example 5 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C .: Viscosity 0.76, 9.6 L, cumene (b
p. 152.4 ° C .: Viscosity 0.74) The solution was dissolved in 10 L of mixed solution containing 0.4 L to prepare a coating solution. Furthermore, this coating solution was applied to spiral grooves (pitch 1.6
μm, groove width 0.6 μm, groove depth 180 nm) made of polycarbonate injection molded substrate (outer diameter 120 mm, thickness 1.
2 mm), a spin coat film was formed in the same manner as in Example 1, and then a reflective layer and a protective layer were formed in the same manner as in Example 1 to prepare a medium. Then, this medium is processed in the same manner as in Example 1
Recording and reading were evaluated at 4 times speed. Under the recording condition of laser power-30.5 mW, the best values of block error rate and jitter were obtained. The block error rate was 5 cps or less and the jitter was 3T pits of 2 respectively.
6.5ns, 3T land was 28ns. Also, 1
The modulation degree of 1T pit was I11 / Ttop = 0.60, and PushPull before recording was PPb = 0.15. 24
The double-speed and high-speed recording characteristics enabled extremely good recording and reading, and the compatibility with various CD players was also very good.

Example 6 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C .: viscosity 0.76) 9.6 L, pseudocumene (bp. 169.4 ° C .: viscosity 1.15) 0.4
A coating solution was prepared by dissolving 10 L of mixed solution containing L. Further, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 mm, with a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm)).
A film was formed by spin-coating a film having a thickness of 1.2 mm) in the same manner as in Example 1 and then forming a reflective layer and a protective layer in the same manner as in Example 1. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Laser power-Block error under recording condition of 30.5mW
The best values were obtained for the rate and the jitter, the block error rate was 5 cps or less, and the jitter was 27.0 ns for 3T pits and 28.5 ns for 3T lands. The modulation degree of 11T pits is I11 / Ttop = 0.
63, PushPull before recording was PPb = 0.11. The 24x speed and high speed recording characteristics enabled very good recording and reading, and the compatibility with various CD players was also very good.

Example 7 As a recording dye, JP-A-03-
200 g of a phthalocyanine dye (B) represented by the following structural formula, which was synthesized according to 62878, was added with 9.6 L of ethylcyclohexane (bp. 131.8 ° C .: viscosity 0.76).
Mesitylene (bp 164.7 ° C: viscosity 1.15)
A coating solution was prepared by dissolving in 10 L of mixed solution containing 0.4 L. Further, this coating solution was applied to a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 n
m) Polycarbonate injection molded substrate (outer diameter 12
0 mm, thickness 1.2 mm) was spin-coated at a rotation speed of 1300 rpm to form a recording layer so that the absorbance was Abs = 0.50. Next, after the substrate and the coated recording layer were sufficiently blended, the substrate on which this recording layer was formed was dried at 80 ° C. for 2 hours to remove the residual solvent in the dye. Further, Ag was sputtered on the recording layer to a film thickness of 60 nm to form a reflective layer. A UV-curable resin SD-1700 (manufactured by Dainippon Ink and Chemicals, Inc.) was spin-coated on this reflective layer, and then irradiated with UV rays to be cured to give a thickness of 6
A protective layer of μm was formed.

[0040]

[Chemical 9] ... (B)

Next, this medium was used in the same manner as in Example 1 to obtain 24
Recording and reading at double speed were evaluated. Under the recording conditions of laser power-30.0 mW, the best values of block error rate and jitter were obtained.
The rate is 5 cps or less, and the jitter is 3T pit 25.
5 ns and 3T land were 26.5 ns. Also, 1
The modulation degree of 1T pit was I11 / Ttop = 0.63, and PushPull before recording was PPb = 0.11. 24
The double-speed and high-speed recording characteristics enabled extremely good recording and reading, and the compatibility with various CD players was also very good.

Example 8 The same phthalocyanine dye as in Example 1 was added to 200 g of n-dibutyl ether (bp. 1).
42.4 ° C .: Viscosity 0.70) 9.6 L and mesitylene (bp 164.7 ° C .: viscosity 1.15) 0.4 L were mixed and dissolved in 10 L to prepare a coating solution.
Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 1. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 1 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Ray
The best results were obtained for the block error rate and the jitter under the recording conditions of the power-30.5 mW, the block error rate was 10 cps, the jitter was 3T pits 32.0 ns, and 3T land. Was 33.0 ns. The modulation degree of 11T pit is I11 / Ttop = 0.61,
The PushPull before recording was PPb = 0.12. The jitter was worse by 2 to 3 ns in the main solvent than the ethylcyclohexane system in the 24x high speed recording property, but still good recording and reading were possible, and the compatibility with each CD player was also very good.

Example 9 The same phthalocyanine dye as in Example 7 was added to 200 g of n-dibutyl ether (bp. 1).
42.4 ° C .: Viscosity 0.70) 9.6 L and mesitylene (bp 164.7 ° C .: viscosity 1.15) 0.4 L were mixed and dissolved in 10 L to prepare a coating solution.
Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 7. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 7 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Ray
The best results were obtained for the block error rate and the jitter under the recording condition of the power-30.0 mW. The block error rate was 10 cps and the jitter was 3T pits 31.0 ns and 3T land. Was 32.5 ns. The modulation degree of 11T pit is I11 / Ttop = 0.61,
The PushPull before recording was PPb = 0.12. Although the jitter was 2-3 ns worse than that of ethylcyclohexane based on the 24x speed high speed recording property, good recording and reading were still possible, and the compatibility with various CD players was also very good.

Example 10 200 g of a phthalocyanine dye similar to that used in Example 1 was mixed with ethylcyclohexane (bp.
131.8 ° C .: Viscosity 0.76) 9.4 L, higher boiling point and higher viscosity than ethylcyclohexane, and O-xylene (bp. 144. 4 ° C: Viscosity 0.7
7) A coating solution was prepared by dissolving in 10 L of mixed solution containing 0.6 L. Further, this coating solution was applied to a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180
nm injection molded substrate made of polycarbonate (outer diameter 1
Then, a spin coat film was formed on 20 mm and a thickness of 1.2 mm in the same manner as in Example 1, and then a reflective layer and a protective layer were formed in the same manner as in Example 1 to form a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Laser power-30.5mW recording condition shows the best block error rate and jitter, block error rate is 10cps, jitter is 3T pits 31.7ns, 3T land Is 32.9 ns,
Within the standard range (standard: block error rate <220 cp
s; 3T pit / land jitter <35 ns, and there was no problem. On the other hand, the modulation degree of 11T pit is I11 / T
top = 0.57, PushPull before recording is PPb =
0.16, which has a lower degree of modulation than mesitylene, which has a higher boiling point and a higher viscosity than O-xylene,
11 also became a slightly high value. However, there was no problem in the 24-times speed high-speed recording / reproducing characteristics, and the compatibility with various CD players was also very good.

Example 11 The same phthalocyanine dye as in Example 7 was added to 200 g of ethylcyclohexane (bp.
131.8 ° C .: Viscosity 0.76) 9.4 L, higher boiling point and higher viscosity than ethylcyclohexane, and O-xylene (bp. 144. 4 ° C: Viscosity 0.7
7) A coating solution was prepared by dissolving in 10 L of mixed solution containing 0.6 L. Further, this coating solution was applied to a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180
nm injection molded substrate made of polycarbonate (outer diameter 1
20 mm, thickness 1.2 mm) was spin-coated on the substrate in the same manner as in Example 7, and then a reflective layer and a protective layer were formed in the same manner as in Example 7 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.0 mW, the block error rate and the jitter show the best values, the block error rate is 5 cps or less, and the jitter is 3T pits 28.5 ns and 3T. The land is 30.1 ns and is within the standard range (standard: block error rate <220
cps; 3T pit / land jitter <35 ns) and there was no problem. On the other hand, the modulation degree of 11T pit is I11.
/Ttop=0.55, PushPull before recording is PP
b = 0.17, both the boiling point and the viscosity are higher than that of O-xylene, for example, the degree of modulation is lower than that of mesitylene,
The value of ushPull was also slightly higher. However, there was no problem in the 24-times speed high-speed recording / reproducing characteristics, and the compatibility with various CD players was also very good.

Example 12 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
131.8 ° C .: Viscosity 0.76) 9.6 L and mesitylene (bp 164.7 ° C .: Viscosity 1.15) 0.4 L
Was dissolved in 10 L of mixed solution to prepare a coating solution. Furthermore, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 mm, pitch 1.6 μm, groove width 0.6 μm, groove depth 170 nm) with a spiral groove.
A spin coat film was formed in the same manner as in Example 1 on a film having a thickness of 1.2 mm. The groove depth of the substrate groove is changed from 180 nm to 170 nm. In the coating film formation, a reflective layer and a protective layer were formed in the same manner as in Example 1 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.5 mW, the block error rate and jitter show the best values, the block error rate is 5 cps or less, and the jitter is 26.5. ns, 3T land is 27.
5 ns, within the standard range (standard: block error rate <220 cps; 3T pit / land jitter <35
ns) and there was no problem. On the other hand, the modulation degree of 11T pit is I11 / Ttop = 0.56, and PushPu before recording.
11 is PPb = 0.14, and the modulation degree is lower than that of the substrate groove depth of 1800A. However, there was no problem in the 24-times speed high-speed recording / reproducing characteristics, and compatibility with various CD players was also good.

Example 13 The same phthalocyanine dye as in Example 7 was added to 200 g of ethylcyclohexane (bp.
131.8 ° C .: Viscosity 0.76) 9.6 L and mesitylene (bp 164.7 ° C .: Viscosity 1.15) 0.4 L
Was dissolved in 10 L of mixed solution to prepare a coating solution. Furthermore, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 mm, pitch 1.6 μm, groove width 0.6 μm, groove depth 170 nm) with a spiral groove.
A spin coat film was formed in the same manner as in Example 7 on the substrate having a thickness of 1.2 mm. The groove depth of the substrate groove is changed from 180 nm to 170 nm. The coating film formation was carried out in the same manner as in Example 7 to form a reflective layer and a protective layer to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.5 mW, the block error rate and the jitter show the best value, the block error rate is 5 cps or less, and the jitter is 25.5. ns, 3T land is 27.
0 ns, within the standard range (standard: block error rate <220 cps; 3T pit / land jitter <35
ns) and there was no problem. On the other hand, the modulation degree of 11T pit is I11 / Ttop = 0.55, and PushPu before recording.
11 was PPb = 0.15, the degree of modulation was lower than that of the substrate groove depth of 1800A, and PushPull was slightly higher. However, there was no problem in the 24-times speed high-speed recording / reproducing characteristics, and compatibility with various CD players was also good.

(Comparative Example 1) In Example 1, the solubility parameter of 8. 8 was used instead of ethylcyclohexane (bp. 131.8 ° C: viscosity 0.76) which is a non-polar solvent having a solubility parameter of 8.5 or less. 5 or more polar solvents of methanol (bp 64.5 ° C .: viscosity 0.59) 9.6
L, mesitylene (bp. 164.7 ° C .: viscosity 1.1)
5) The same phthalocyanine dye (Chemical Formula 1) 20 used in Example 1 was prepared using 10 L of the mixed solution containing 0.4 L.
When 0 g was dissolved to prepare a coating solution, the phthalocyanine was not sufficiently dissolved and was precipitated. Therefore, it could not be used as a medium.

(Comparative Example 2) In Example 7, the solubility parameter of 8. was replaced with ethyl cyclohexane (bp. 131.8 ° C: viscosity 0.76) which is a non-polar solvent having a solubility parameter of 8.5 or less. 5 or more polar solvent methyl ethyl ketone (bp.79.6 ° C: viscosity 0.4)
The same phthalocyanine dye as that used in Example 6 was obtained by using 10 L of the mixed solution in which 9.6 L and 0.4 L of mesitylene (bp 164.7 ° C .: viscosity 1.15) were added.
(Chemical Formula 2) 200 g was dissolved to prepare a coating solution. further,
Apply this coating solution to a spiral groove (pitch: 1.6μ
m, groove width 0.6 μm, groove depth 180 nm) with polycarbonate injection molded substrate (outer diameter 120 mm, thickness 1.2)
mm) was spin-coated to form a film in the same manner as in Example 7, but methyl ethyl ketone dissolved the polycarbonate substrate, and it was not possible to use it as a medium as in Example 6.

(Comparative Example 3) 200 g of the same phthalocyanine dye as in Example 1 was mixed with ethylcyclohexane (bp.
31.8 ° C .: Viscosity coefficient 0.76) 9.6 L and diethylene glycol dimethyl ether which does not dissolve the polycarbonate substrate at all (bp. 159.8 ° C .: viscosity coefficient 0.9)
8) A coating solution was prepared by dissolving in 10 L of mixed dissolution containing 0.4 L. Further, this coating solution was applied to a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180
nm injection molded substrate made of polycarbonate (outer diameter 1
Then, a spin coat film was formed on 20 mm and a thickness of 1.2 mm in the same manner as in Example 1, and then a reflective layer and a protective layer were formed in the same manner as in Example 1 to form a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.5 mW, the block error rate and the jitter were bottom values, but the block error rate was 300 cps, the jitter was 3T pits 40.9 ns, and 3T land. Is 45.5 ns, which is outside the standard range (standard: block error rate <220
cps; 3T pit / land jitter <35 ns). The modulation degree of 11T pit is I11 / Ttop =
0.61, PushPull before recording PPb = 0.1
3 and had a function as a leveling agent. Two
The quadruple speed / high speed recording / reproducing characteristics were not sufficient, and some CD players could not reproduce.

(Comparative Example 4) 200 g of the same phthalocyanine dye as in Example 7 was mixed with ethylcyclohexane (bp.
31.8 ° C .: Viscosity of 0.76 (9.8 L) and decalin that does not dissolve the polycarbonate substrate (bp. 195.
8 ° C .: Viscosity 3.38) 0.2 L of mixed solution was dissolved in 10 L to prepare a coating solution. Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 1. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 7 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Laser power-30.
Block error rate and jitter under 0 mW recording condition
Was the bottom price, but the block error rate was 750 cp
The s and jitter were 44.5 ns for 3T pits and 50.1 ns for 3T lands, which was outside the standard range (standard: block error rate <220 cps; 3T pit / land jitter <35 ns). The modulation degree of 11T pit is I11 / Ttop = 0.63, and PushPull before recording.
Has PPb = 0.08, and has a function as a leveling agent. The 24x speed high-speed recording / reproducing characteristics were not sufficient, and some CD players could not reproduce.

Comparative Example 5 The same phthalocyanine dye as in Example 1 was added to 200 g of ethylcyclohexane (bp.
31.8 ° C .: Viscosity 0.76) 9.6 L and a polycarbonate substrate are substantially dissolved but not an aromatic compound, an organic solvent 2,6-dimethyl-4-heptanone (bp.1).
68.1 ° C .: Viscosity of 0.99) Dissolved in 10 L of mixed solution to which 0.4 L was added to prepare a coating solution. Furthermore, this coating solution was applied to spiral grooves (pitch: 1.6 μm,
Polycarbonate injection molded substrate with a groove width of 0.6 μm and a groove depth of 180 nm (outer diameter 120 mm, thickness 1.2 m)
m) A spin coat film was formed thereon in the same manner as in Example 1, and then a reflective layer and a protective layer were formed in the same manner as in Example 1 to prepare a medium. Then, this medium is processed in the same manner as in Example 1
Recording and reading at double speed were evaluated. Laser power-30.5 mW recording condition, the block error rate and the jitter were bottom values, but the block error rate was 5
4 cps, jitter is 3T pit is 35.9 ns, 3T
The land was 36.2 ns, and the jitter was outside the standard range (standard: block error rate <220 cps; 3T pit / land jitter <35 ns). It is considered that the interface strength between the recording layer and the substrate was insufficient. The modulation degree of 11T pit is I11 / Ttop = 0.63,
PushPull before recording is PPb = 0.11,
It had a function as a leveling agent. The 24x high speed recording / reproducing characteristics were sufficient, but some CD players could not reproduce.

Comparative Example 6 200 g of the same phthalocyanine dye as in Example 1 was mixed with ethylcyclohexane (bp. 1).
31.8 ° C .: Viscosity of 0.76) 9.6 L and a polycarbonate substrate are substantially dissolved to form an aromatic compound.
A coating solution was prepared by dissolving it in 10 L of mixed solution containing 0.4 L of toluene (bp. 110.6 ° C .: viscosity of 0.59), which is an organic solvent having a lower boiling point and a lower viscosity than ethylcyclohexane. Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 1. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 1 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording condition of laser power-30.5 mW, the bottom values of the block error rate and the jitter were obtained, but the block error rate was 526 cps, respectively.
Jitter is 42.5ns for 3T pit and 4 for 3T land
It was 3.5 ns, which was outside the standard range. Also, 11T
The degree of modulation of the pit was I11 / Ttop = 0.43, and it was not possible to obtain a sufficient degree of modulation. In addition, Pu before recording
The shPull was too high at PPb = 0.20 and some CD players caused a tracking servo error.

Comparative Example 7 200 g of the phthalocyanine dye similar to that used in Example 7 was mixed with ethylcyclohexane (bp. 1).
31.8 ° C .: Viscosity of 0.76) 9.6 L and a polycarbonate substrate are substantially dissolved to form an aromatic compound.
A coating solution was prepared by dissolving it in 10 L of mixed solution containing 0.4 L of toluene (bp. 110.6 ° C .: viscosity of 0.59), which is an organic solvent having a lower boiling point and a lower viscosity than ethylcyclohexane. Further, this coating solution was applied onto a polycarbonate injection-molded substrate (outer diameter 120 mm, thickness 1.2 mm) with spiral grooves (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm) as in Example 7. After spin coating, the reflective layer and the protective layer were formed in the same manner as in Example 7 to prepare a medium. Next, this medium was evaluated for recording and reading at 24 × speed in the same manner as in Example 1. Under the recording conditions of laser power-30.0 mW, the bottom values of the block error rate and the jitter were obtained, but the block error rate was 417 cps, respectively.
Jitter is 39.5 ns for 3T pit and 4 for 3T land
It was 1.5 ns, which was outside the standard range. Also, 11T
The modulation degree of the pit was also I11 / Ttop = 0.41, and a sufficient modulation degree could not be obtained. In addition, Pu before recording
The shPull was too high at PPb = 0.21 and some CD players caused a tracking servo error.

Comparative Example 8 In Example 1, ethylcyclohexane (bp. 131.8 ° C .: viscosity 0.76) which is a non-polar solvent having a solubility parameter of 8.5 or less and a boiling point higher than that of ethylcyclohexane, Has a high viscosity,
Also, using 10 L of the solution, mesitylene having an aromatic ring (bp. 164.7 ° C .: viscosity 1.15) that substantially dissolves the polycarbonate substrate was added and mixed at a mixing ratio of 8.9 L: 1.1 L. A coating solution was prepared by dissolving 200 g of the same phthalocyanine dye (Chemical Formula 1) used in Example 1 as a coating solution. Further, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 mm, with a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm)).
A spin coat film was formed on the above substrate (thickness: 1.2 mm) in the same manner as in Example 1. However, since mesitylene was added more than necessary, the polycarbonate substrate was dissolved and the medium was formed as in Example 1. I couldn't plan.

(Comparative Example 9) In Example 7, ethylcyclohexane (bp. 131.8 ° C: viscosity 0.76) which is a non-polar solvent having a solubility parameter of 8.5 or less and a boiling point higher than that of ethylcyclohexane, Has a high viscosity,
Also, using 10 L of the solution, mesitylene having an aromatic ring (bp. 164.7 ° C .: viscosity 1.15) that substantially dissolves the polycarbonate substrate was added and mixed at a mixing ratio of 8.9 L: 1.1 L. A coating solution was prepared by dissolving 200 g of the same phthalocyanine dye (Chemical Formula 1) used in Example 1 as a coating solution. Further, this coating solution was applied to a polycarbonate injection-molded substrate (outer diameter 120 mm, with a spiral groove (pitch 1.6 μm, groove width 0.6 μm, groove depth 180 nm)).
A spin coat film was formed on the substrate (thickness: 1.2 mm) in the same manner as in Example 7. However, since mesitylene was added more than necessary, the polycarbonate substrate was dissolved and the medium was formed as in Example 7. I couldn't plan. As described above, Tables 1 to 4 show a list of the execution conditions of Examples 1 to 13 and Comparative Examples 1 to 9, and the results are shown in Tables 5 and 6.

[0057]

[Table 1]

[0058]

[Table 2]

[0059]

[Table 3]

[0060]

[Table 4]

[0061]

[Table 5]

[0062]

[Table 6]

[0063]

As is apparent from the examples, in the present invention, the non-polar organic solvent (1) having a solubility parameter of 8.5 or less, in which the dye for the recording layer does not substantially dissolve the polycarbonate substrate, (1) ) Has a higher boiling point and a higher viscosity,
And a mixed solvent of at least two kinds each containing an organic solvent (2) having an aromatic ring that substantially dissolves the polycarbonate substrate, and the non-polar organic solvent (1) is 90-99 relative to the entire coating solvent. When the optical information recording medium on which the reflective layer and the protective layer are formed is dissolved and coated at a mixing ratio of volume% and recorded at a high speed of 24 times or more, excellent error rate and jitter characteristics are obtained. Thus, it is possible to provide an optical information recording medium which has a sufficient degree of modulation and has an appropriate PushPull. This proved stable compatibility with commercial CD players.
Further, high-speed recording by a blue short wavelength laser can be expected sufficiently.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Jun Tokuhiro             Chiba Prefecture Sodegaura City Nagaura 580 32-32 Mitsui Chemicals Co., Ltd.             In the company (72) Inventor Eiichi Takahashi             Chiba Prefecture Sodegaura City Nagaura 580 32-32 Mitsui Chemicals Co., Ltd.             In the company (72) Inventor Masatoshi Yanagimachi             Chiba Prefecture Sodegaura City Nagaura 580 32-32 Mitsui Chemicals Co., Ltd.             In the company F term (reference) 2H111 EA03 EA22 EA37 FA12 FA14                       FA37 FB45 GA05                 5D029 JA04 JB45 WB17 WC01 WD08                 5D121 AA01 EE22

Claims (15)

[Claims] 1. An optical information recording medium in which a recording layer, a reflective layer, and a protective layer made of an organic dye capable of writing information by laser light are provided in this order on a substrate, and the recording layer dye is a polycarbonate substrate. Non-polar organic solvent (1) with a solubility parameter of 8.5 or less
And (2) at least two kinds of mixed solvents each containing an organic solvent (2) having a higher boiling point and higher viscosity than (1) and having an aromatic ring that substantially dissolves the polycarbonate substrate, An optical information recording medium having a reflective layer and a protective layer formed after the non-polar organic solvent (1) is dissolved and coated at a mixing ratio of 90 to 99% by volume with respect to the entire coating solvent. 2. The recording layer dye has a linear velocity of 28.8 m / s.
Recording is possible with ec or more.
The optical information recording medium described. 3. The optical information recording medium according to claim 1, wherein the nonpolar organic solvent (1) has a saturated alicyclic hydrocarbon. 4. The boiling point of the organic solvent (2) is 140 ° C. (101
325 Pa) or more and viscosity of 0.6 cP (20 ° C)
The optical information recording medium according to claim 1, 2 or 3 as described above. 5. The groove depth provided on the substrate is 1
It is 80 nm or more, The optical information recording medium in any one of Claim 2 thru | or 4 characterized by the above-mentioned. 6. The organic solvent (2) is a) trimethylbenzene,
b) tetralin, c) butylbenzene, d) cymene, e) cumene, f)
The optical information recording medium according to claim 2, wherein the optical information recording medium is selected from any one of xylene. 7. The optical information recording medium according to claim 1, wherein the recording layer is a phthalocyanine dye soluble in a nonpolar solvent. 8. The optical information recording medium according to claim 7, wherein the recording layer is a halogenated phthalocyanine dye soluble in a nonpolar solvent. 9. An optical information recording medium in which a recording layer, a reflective layer, and a protective layer made of an organic dye capable of writing information by laser light are provided in this order on a substrate, and the recording layer dye is a polycarbonate substrate. Non-polar organic solvent (1) with a solubility parameter of 8.5 or less
And (2) at least two kinds of mixed solvents each containing an organic solvent (2) having a higher boiling point and higher viscosity than (1) and having an aromatic ring that substantially dissolves the polycarbonate substrate, A method for manufacturing an optical information recording medium, wherein the non-polar organic solvent (1) is dissolved and coated at a mixing ratio of 90 to 99% by volume with respect to the entire coating solvent, and then the reflective layer and the protective layer are formed. 10. The method for producing an optical information recording medium according to claim 9, wherein the non-polar organic solvent (1) has a saturated alicyclic hydrocarbon. 11. The boiling point of the organic solvent (2) is 140 ° C. (10
1325 Pa) or more and a viscosity of 0.6 cP (20
11. The method for producing an optical information recording medium according to claim 9 or 10, wherein the temperature is at least ° C). 12. The method for manufacturing an optical information recording medium according to claim 9, wherein the groove groove depth provided in the substrate is 180 nm or more. 13. The organic solvent (2) is selected from any one of g) trimethylbenzene, h) tetralin, i) butylbenzene, j) cymene, k) cumene and l) xylene.
13. The method for manufacturing an optical information recording medium according to any one of 1 to 12. 14. The method for producing an optical information recording medium according to claim 9, wherein the recording layer is a phthalocyanine dye soluble in a nonpolar solvent. 15. The method for producing an optical information recording medium according to claim 14, wherein the recording layer is a halogenated phthalocyanine dye soluble in a nonpolar solvent.