JP2002092949A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high density and high quality optical information recording medium with little noise of a signal having a resin film which constitutes a light transmission (cover) layer excellent in transparency, rigidity, surface smoothness, thickness accuracy and the like, low in double refractive index and small in phase difference. SOLUTION: The optical information recording medium consisting of a substrate, a signal layer disposed on the substrate and the light transmission layer laminated on the signal layer and capable of writing and reading by making a laser beam incident from a light transmission layer side is characteristically composed of an aromatic polycarbonate resin with which 0.01-40 pts.wt. compound shown by the general formula [1] is mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical information recording medium. More specifically, an optical information recording medium having excellent transparency, excellent rigidity, excellent surface smoothness, excellent thickness accuracy, small birefringence, small phase difference, and high density. It is about.

[0002]

2. Description of the Related Art Conventionally, write-once compact disks (CD-R) and magneto-optical disks (M
O), an optical disk such as a digital versatile disk (DVD) has been used. In a conventional optical disk, generally, a signal layer is disposed on a transparent substrate, a laser beam is incident from the transparent substrate side, and the signal is recorded on the signal layer, and the recorded signal is read.

However, in order to further increase the recording density of an optical disc in recent years, a technique of injecting a laser beam from a signal surface side through a light transmitting layer having a very small thickness among techniques called a light transmitting layer incidence type ( There has been proposed an optical disk having a higher density, which employs a light transmission layer incident type technology). This light transmitting layer incident type technology is, for example, an ISOM
/ ODS'99 (International Symposium on Optical)
(Memory / Topical MeetingonOptical Data Storage 1999)
And disclosed in JP-A-2000-11449, JP-A-2000-82236 and the like.

FIGS. 1 and 2 show examples of an optical information recording medium of a light transmitting layer incident type. FIG. 1 is an explanatory longitudinal sectional view of an example of a reproduction type optical information recording medium. The reproduction-type optical information recording medium 1 includes a substrate 2, a signal layer including a pit 30 and a reflection film 32 disposed on the substrate 2, and a light transmission layer 5 disposed on the signal layer via an adhesive layer 4. The laser beam 7 is made incident from the light transmitting layer 5 side through the lens 6 so that a signal can be read.

FIG. 2 is an explanatory longitudinal sectional view of an example of a rewritable optical information recording medium. The rewritable optical information recording medium 11 includes a substrate 12, a signal layer including pits and grooves 31, a reflection film 32, a recording film 33 and a protective film 34 disposed on the substrate 12, and an adhesive layer 4 on the signal layer. The laser light 7 is incident from the light transmitting layer 5 side through the lens 6 to enable signal writing and signal reading. . Laser light source is 650nm
A lens having a shorter wavelength of about 400 nm than that of the lens 7 is used.
By increasing the numerical aperture (NA) of the related art from about 0.6 to about 0.85, the laser spot diameter can be reduced, and a smaller signal can be written and read. As a result, Higher densification is achieved.

However, when an objective lens with a high NA is used, the influence of coma, which is a wavefront aberration, increases, and a problem arises in that the signal has much noise. Therefore, it is effective to reduce the distance that the laser beam passes through the disk to eliminate the influence of coma. Therefore, the above-described light transmission layer incident type technology was devised, in which a signal layer is present on a substrate, a thin transparent light transmission layer is disposed thereon, and a laser is transmitted from the light transmission layer side. This is a technique for writing and reading signals by making the light incident.

[0007] The substrate used in the light transmitting layer incident type technology is as follows.
It may be opaque because it does not transmit laser light, and is usually manufactured by injection molding using a thermoplastic resin as a raw material, and pits or grooves corresponding to signals are formed on this substrate. In the light transmitting layer incident type technology, the conventional C
In order to have compatibility with D and DVD, the thickness of the substrate is about 0.1 to 1.1 mm. Pits, grooves, reflective films, recording films, etc. are laminated on this substrate, and a transparent resin film called a light transmission layer having a thickness of about 0.01 mm to 0.5 mm, an adhesive or an adhesive film is formed thereon. It is common to bond them together.

The resin film constituting the light transmitting (cover) layer needs to be excellent in transparency because a laser beam is incident thereon. The resin film must be free from crystallized substances generated in the film manufacturing process, gelled substances that are transparent but affect the refractive index, and the resin film is thin, so when the numerical aperture of the lens increases, It is also required that the absolute value of the thickness variation is small.

Further, if the phase difference generated when the laser beam is incident is large, signal noise increases. The phase difference includes a phase difference generated when a resin film is manufactured, and a phase difference generated when a tension is applied to a resin film and the resin film is bonded to a substrate. Furthermore, if the rigidity of the resin film is low, wrinkles and undulations are likely to occur when the resin film is bonded to the substrate, and the resin film surface may be poor in smoothness, which may make signal reading difficult. Therefore, the performance required for the resin film constituting the light transmitting layer is excellent in transparency, excellent in rigidity, excellent in surface smoothness, excellent in thickness accuracy, small in birefringence, and retarded. Need to be small.

Conventionally, transparency, birefringence, dimensional stability,
From the viewpoint of low cost and the like, an aromatic polycarbonate resin film has been used as the resin film for the light transmission layer. However, the conventional aromatic polycarbonate resin has a disadvantage that the phase difference due to the optical anisotropy of the phenyl group becomes large. This retardation is a retardation caused by molecular orientation due to shear force generated when producing a film,
Includes the phase difference that occurs when applying tension to the substrate. In addition, the rigidity of the aromatic polycarbonate resin alone is insufficient, and there is a disadvantage that wrinkles and undulations are easily generated when the film is bonded to a substrate.

Further, the method for producing the resin film is preferably a solution casting method. However, if the molecular weight of the aromatic polycarbonate resin is too low, the solution viscosity becomes low,
Adjustment of the thickness during film production becomes difficult, and there is a disadvantage that the thickness varies greatly. That is, a method for improving all properties such as high rigidity, good surface smoothness, thickness accuracy, and low birefringence has not yet been found using the aromatic polycarbonate resin alone.

As a technique for reducing the phase difference, it is known that the use of a polycarbonate resin having an anisotropic molecular skeleton is effective (see JP-A-2000-86783). However, if a monomer other than the commonly used bisphenol A type is used, the cost of the polycarbonate resin is greatly increased, which is disadvantageous from the viewpoint of cost. Further, in order to increase the rigidity of the resin, there is a method of introducing a structure having high steric hindrance into the molecular skeleton, but it is disadvantageous from the viewpoint of cost. Further, if glass fibers or inorganic fillers are added, there are drawbacks that rigidity can be increased and transparency and surface smoothness are impaired.

[0013]

SUMMARY OF THE INVENTION In view of the above situation, the present inventors have made intensive studies to solve the above-mentioned drawbacks which existed in the light-transmitting layer incident type technology, and reached the present invention. It was done. That is, the objects of the present invention are as follows. 1. Light transmission (cover) made of resin film with excellent transparency, rigidity, surface smoothness, and thickness accuracy
To provide an optical information recording medium having a layer. 2. To provide an optical information recording medium having a light transmission (cover) layer made of a resin film having a small birefringence and a small phase difference and having a small signal noise.

[0014]

In order to solve the above-mentioned problems, the present invention has a substrate, a signal layer disposed on the substrate, and a light transmitting layer laminated on the signal layer. An optical information recording medium in which recording and writing can be performed by injecting a laser beam, wherein the light transmission layer is based on 100 parts by weight of an aromatic polycarbonate resin.
An optical information recording medium characterized by comprising an aromatic polycarbonate resin composition containing 0.01 to 40 parts by weight of a compound represented by the following general formula [I].

[0015]

Embedded image

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the optical information recording medium according to the present invention, the light transmitting layer is composed of a resin composition having an aromatic polycarbonate resin as a base. The aromatic polycarbonate resin is produced by a phosgene method (interfacial method) or a transesterification method (melting method). Aromatic polycarbonate resins can be industrially advantageously produced as inexpensive and high-purity resins by using bisphenol A type monomers. This aromatic polycarbonate resin has the following general formula
A bisphenol A type aromatic polycarbonate resin represented by [II] is exemplified.

[0017]

Embedded image

The aromatic polycarbonate resin preferably has a viscosity average molecular weight (M) in the range of 15,000 to 120,000. In the present invention, the viscosity average molecular weight (M) is defined as the intrinsic viscosity [η] obtained by using an Ostwald viscometer using methylene chloride as a solvent,
The viscosity of hnell type, i.e., [η] = 1.23 × 10 - 5
M ^0.85 . With a molecular weight of 15,
When the molecular weight is less than 000, an unfavorable phenomenon such as an increase in thickness variation when forming a film by the solution casting method, an increase in haze due to crystallization when forming a film due to a low molecular weight, and the like occur. .
On the other hand, if the molecular weight exceeds 120,000, the solution viscosity becomes too high when forming a film by the solution casting method, and the thickness of the film constituting the light transmitting (cover) layer becomes undesirably large. The viscosity average molecular weight is preferably from 18,000 to 110,000 in the above range.

As a method of forming a film, a solution casting method is preferable because a film having excellent thickness accuracy and a small phase difference can be obtained as compared with a general melt extrusion method. In the case of a general melt extrusion method, when a high-viscosity molten resin is extruded from the tip of a T-die, variations in the extrusion direction and the thickness in the vertical direction are likely to occur. Further, the positional accuracy of the distance between the rolls for finally determining the thickness is 0.
It is likely to be inaccurate for a film thickness of about 1 mm.
Further, when extruding from a T-die, a high shearing force acts on a resin having a high viscosity, so that a phase difference due to molecular orientation increases.

On the other hand, in the solution casting method, the aromatic polycarbonate resin composition is dissolved in a concentration of 3 to 20% using, for example, methylene chloride as a solvent, and the solution is flowed from a T-die onto, for example, a polyethylene terephthalate (PET) film. And then peeled off from the PET film via a drying step. According to this method, the solution viscosity can be changed over a wide range by arbitrarily changing the solution concentration, the thickness accuracy of the film can be improved, and the variation can be reduced. Since the film can be cast, a retardation due to molecular orientation hardly occurs, and a film having a small retardation can be obtained. The thickness of the film is preferably selected in the range of about 0.02 mm to 0.3 mm.

The aromatic polycarbonate resin is blended with 0.01 to 40 parts by weight of the compound represented by the general formula [I] based on 100 parts by weight of the base resin. The general formula
By blending the compound represented by [I], the rigidity can be improved while maintaining the transparency of the aromatic polycarbonate resin of the base, and at the same time, the glass transition temperature of the base resin can be lowered. By improving the rigidity, when laminating a film as a light transmission layer on the signal layer, wrinkles and undulations are less likely to occur, and the glass transition temperature is lowered, thereby reducing the phase difference during film production. In addition, there is an advantage that a phase difference is less likely to occur when bonding the substrate to a substrate while applying tension.

The compound represented by the above general formula [I] is n
Is preferably selected from 0 to 5. The compound in which n is 0 is biphenyl and the compound in which 1 is terphenyl. The compound in which n is 1 or more has an ortho bond of a phenyl group,
It is selected from either meta or para. When n is 6 or more, the heat resistance of the aromatic polycarbonate resin composition for producing a resin film is insufficient, which is not preferable. Each phenyl group may have a substituent R. Among them, the substituent R in the structural formula is preferably a hydrogen atom, a halogen atom, an alkyl group having 0 to 3 carbon atoms, or a methoxy group.

When compounding the compound represented by the above general formula [I] with the aromatic polycarbonate resin of the substrate,
One kind or two or more kinds may be mixed and compounded.
The compounding amount of the above compound with respect to the aromatic polycarbonate resin of the base is 0.01 to 100 parts by weight of the base resin.
It shall be selected in the range of 40 parts by weight. The amount is 0.01
If the amount is less than 10 parts by weight, the effect of improving the rigidity of the aromatic polycarbonate resin and the effect of lowering the glass transition temperature are not remarkable. If the amount exceeds 40 parts by weight, the effect of improving the rigidity and the effect of lowering the glass transition temperature are saturated. The preferable compounding amount of the above compound is 0.05 to 30 parts by weight, and particularly preferable is 0.1 to 20 parts by weight.

The rigidity of the aromatic polycarbonate resin composition for producing a resin film is such that the flexural modulus according to ASTM D790 is from 2,300 Mpa to 6,000 Mpa.
It is preferable to select in the range of pa. For example, in the case of a bisphenol A type aromatic polycarbonate resin having a viscosity average molecular weight of 25,000, the flexural modulus is 2,200 Mp.
When the resin composition is prepared by mixing 5 parts by weight of a metaterphenyl compound corresponding to the compound represented by the general formula [I], the flexural modulus of the resin composition is 2,800.
It becomes high up to about Mpa. Further, the glass transition temperature of the aromatic polycarbonate resin itself is about 140 to 150 ° C., and when the metaterphenyl compound is mixed with 5 parts by weight, the glass transition temperature is lowered by about 20 ° C. It is considered that a decrease in the glass transition temperature of the resin composition has the same effect as an improvement in workability, and as a result, the phase difference is reduced or hardly occurs.

The aromatic polycarbonate resin composition includes:
Various additives such as a flame retardant, a flame retardant auxiliary, a colorant, a plasticizer, a lubricant, a heat stabilizer, an antistatic agent, a release agent, and an ultraviolet absorber, as long as the object of the present invention is not impaired. Can be blended. In order to prepare the aromatic polycarbonate resin composition, the aromatic polycarbonate resin is dissolved in a solvent such as methylene chloride at a predetermined concentration, and further, the compound represented by the general formula [I] or, if necessary,
Predetermined amounts of the above various additives are weighed, added and dissolved uniformly.
A method of mixing and producing a resin film by the solution casting method described above, a method in which the compound represented by the general formula [I] and, if necessary, the various additives described above are weighed in a predetermined amount in an aromatic polycarbonate resin to obtain V It is mixed by a mixer such as a mold blender, and the obtained mixture is melted and kneaded by an extruder to form pellets, and the pellets are mixed and dissolved at a predetermined concentration, for example, in a methylene chloride solution, and the resin is cast by the solution casting method described above. And a method for producing a film.

The substrate in the optical information recording medium according to the present invention is for disposing a signal layer on the surface. The substrate is preferably made of a material having a strength capable of disposing the signal layer, and examples thereof include various thermoplastic resins. Specific examples include aromatic polycarbonate, methacrylic resin, polystyrene resin, AS resin, ABS resin, and alloy of polycarbonate and ABS resin. Among them, aromatic polycarbonate is preferred. The thickness of the substrate is preferably selected in the range of 0.5 mm to 3 mm. The signal layer is formed of, for example, a reflective film, a pit, a groove, a recording film, a protective film, and the like.

In a reproduction type optical information recording medium, a signal layer is usually composed of a reflection film and pits. In a rewritable type optical information recording medium, the signal layer is usually a reflection film, pits, grooves, a recording film and a protective film. It is composed of a membrane. The reflection film is formed on the substrate and reflects the incident laser light. Examples of a material that can be used for the reflective film include aluminum, silver, and gold. The thickness of the reflection film is about 10 to 200 nanometers. In a read-type optical information recording medium, by reading the signal of a signal layer composed of pits and the like arranged on a substrate,
A signal is reproduced, and in a rewritable optical information recording medium, a signal in a signal layer including a pit, a groove, a recording film and the like disposed on a substrate is written or read.

The recording film is, for example, a phase change film of Ge-
It is composed of Sb-Te and has a thickness of about 10 to 200 nanometers. The protective film is laminated on both sides of the recording film, and absorbs heat generated from the recording film. Protective film is a transparent, for example, a Zn-SiO _2, the thickness is about 10 to 300 nanometers. The signal layer and the light transmitting layer are usually bonded by a transparent adhesive film, and the adhesive film is formed of, for example, a UV-curable resin or an adhesive sheet. The thickness of the adhesive film is about 10 to 100 μm. A light transmission layer of about 20 to 300 μm is formed on the adhesive film.

In a rewritable optical information recording medium,
When writing or erasing, recording or erasing is performed by irradiating a laser beam from the surface of the light transmitting layer and focusing on the recording film through an adhesive film and a protective film.
When reading on a rewritable optical information recording medium, laser light enters from the surface of the light transmitting layer, and an adhesive film,
The light is reflected by the reflective film through the protective film, the recording film, and the protective film. In a reproduction-type optical information recording medium, laser light enters from the surface of the light transmitting layer and is reflected by the reflection film through the adhesive film.

In the optical information recording medium according to the present invention, a signal layer or the like is laminated on an opaque substrate manufactured by an injection molding method, and 0.02 mm to 0.3 mm is formed thereon.
It can be easily manufactured by bonding a transparent resin film called a light transmission (cover) layer having a thickness of about mm through an adhesive or an adhesive film.
In the optical information recording medium according to the present invention, the resin film constituting the light transmitting layer is excellent in transparency, rigidity, surface smoothness, and thickness accuracy, and has a small birefringence and a small phase difference. , High density and high quality are achieved.

The optical information recording medium according to the present invention is a light transmitting layer incident type recording medium in which a laser beam is made incident from the light transmitting (cover) layer side to enable writing and reading of an information signal. , Write-on compact disc (CD-
R), a magneto-optical disk (MO), and a digital versatile disk (DVD).

[0032]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following description examples unless it exceeds the gist.

[Examples 1 to 6 and Comparative Examples 1 and 2] <Types of Resin and Compound Represented by General Formula [I]> Resins used in Examples and Comparative Examples; ] Are as follows. (1) Aromatic polycarbonate resin (PC-1): a bisphenol A type polycarbonate resin pellet having a viscosity average molecular weight of 16,000. (2) Aromatic polycarbonate resin (PC-2): a bisphenol A type polycarbonate resin pellet having a viscosity average molecular weight of 40,000. (3) Aromatic polycarbonate resin (PC-3): bisphenol A type polycarbonate resin pellet having a viscosity average molecular weight of 60,000. (4) Aromatic polycarbonate resin (PC-4): bisphenol A type polycarbonate resin pellet having a viscosity average molecular weight of 20,000. (5) Aromatic polycarbonate resin (PC-5): bisphenol A type polycarbonate resin pellet having a viscosity average molecular weight of 100,000. (6) Compound represented by the general formula [I]: n, p, q, r and substituent R of the compound represented by the general formula [I] are as described in Tables 1 and 2. .

<Preparation of Resin Film by Casting Method> The resin film constituting the light transmitting layer was prepared as follows. Pellets of the above aromatic polycarbonate resins (PC-2, PC-3, PC-4, PC-5) were dissolved at a concentration of 12% in methylene chloride as a solvent, and dissolved in Table 1 and Table-2.
The amounts of the compounds represented by the general formula [I] were mixed and uniformly dissolved and mixed. This solution was cast on a PET film from a T-die, dried through a continuous drying oven at a temperature of 80 ° C., and then peeled off from the PET film to obtain a 100 μm thick resin film by a casting method. Was.

<Preparation of Optical Information Recording Medium> Injection molding machine (manufactured by Sumitomo Heavy Industries, Ltd., model:
According to DISK3), the aromatic polycarbonate resin (PC-1) was heated at a cylinder temperature of 380 ° C and a mold temperature of 11 ° C.
A signal imprinted on a stamper having a track pitch of 0.3 μm and a groove depth of 60 nm was transferred at 8 ° C., a molding cycle of 12 seconds, and a diameter of 120 mm and a thickness of 1.1 mm.
mm optical disk substrates were manufactured. On one surface of the substrate by sputtering, Al film is a reflective film, ZnS-SiO ₂ film as a protective film, a recording film Ge-Sb-Te
A film and a ZnS—SiO ₂ film as a protective film were sequentially formed. After applying a double-sided adhesive having a thickness of 25 μm on this protective film using a laminator, the resin film was bonded again using the laminator while applying tension to the resin film. Thereafter, the resin film was cut into a disk shape with scissors to obtain an optical information recording medium.

The obtained optical information recording medium was subjected to various evaluations by the methods described below, and the evaluation results are shown in Tables 1 and 2. Flexural modulus (Mpa) of resin composition: Measured in accordance with ADTM D790. Variation in thickness of the resin film: For the resin film before bonding to the substrate, T
40 at 2 mm intervals in the feed direction and width direction for the die
The average value (μm) obtained by the point measurement and 3σ were calculated. As for these, the smaller the numerical value, the smaller the variation and the more preferable. (c) Haze (%): Measured according to JIS K7105 for the resin film prepared by the above method.

(D) Phase difference (nm): Using a phase difference measuring device (manufactured by Admon Science Co., Ltd., model: F3HP-30NDT), four points in the radial direction in a double pass of the resin film after lamination, a circle Four points in the circumferential direction were measured, and the maximum value (nm) of the absolute value was described. The smaller the numerical value, the better. (e) Presence or absence of wrinkles: The presence or absence of wrinkles on the surface of the resin film bonded to the substrate was observed with an optical microscope. (f) Size of undulation (μm): 15 μm of undulation in micron order per resin film bonded to substrate
The undulations within the 0 μm square are measured by AFM (atomic force microscope: manufactured by Digital Instruments, model: NanoScope)
II). The smaller the numerical value, the better.

[0038]

[Table 1]

[0039]

[Table 2]

From Tables 1 and 2, the following becomes clear. (1) Since the resin film constituting the light transmission (cover) layer has a small thickness variation, a small phase difference, and no wrinkles or undulations, the optical information medium according to the present invention having this resin film has a high quality. (Examples 1 to 6)
reference). (2) On the other hand, a compound not containing the compound represented by the general formula [I] (Comparative Example 1) and a compound containing less than 0.01 part by weight (Comparative Example 2) )
Compared with those of the examples, the variation in thickness of the resin film constituting the light transmitting layer is large, the phase difference is large, wrinkles are generated, and the waviness is large, so the optical information medium having such a resin film Is of poor quality.

[0041]

The present invention has been described in detail above and has the following particularly advantageous effects, and its industrial utility value is extremely large. 1. In the optical information medium according to the present invention, the resin film constituting the light transmitting (cover) layer is excellent in transparency, rigidity, surface smoothness, thickness accuracy, and the like.
High quality is achieved. 2. The optical information medium according to the present invention is excellent in rigidity because the compound represented by the general formula [I] is blended in the resin film constituting the light transmitting layer, and has a high tension when the resin film is bonded to the signal layer. , A phase difference hardly occurs, wrinkles and undulations hardly occur, surface smoothness is excellent, and signal reading is easy.

3. In the optical information medium according to the present invention, the resin film constituting the light transmitting (cover) layer has a small birefringence and a small phase difference, so that the signal noise is small and the quality is high. 4. When the resin film constituting the light transmission (cover) layer is prepared from an aromatic polycarbonate resin having a viscosity average molecular weight (M) of 15,000 to 120,000, a resin film having excellent thickness accuracy can be produced. The quality of the optical information medium according to the present invention to which the resin film is attached is improved. 5. The resin film constituting the light transmission (cover) layer is represented by A
Flexural modulus according to STM D790 is 2,300M
When prepared from an aromatic polycarbonate resin composition in the range of pa to 6,000 Mpa, the rigidity of the resin film is excellent, so that a high-quality optical information recording medium can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view of an example of an optical information recording medium of a light transmission layer incident type (reproducing type).

FIG. 2 is an explanatory longitudinal sectional view of an example of an optical information recording medium of a light transmission layer incident type (rewritable type).

[Explanation of symbols]

 1, 11: Optical information recording medium 2, 12: Substrate 30: Signal layer (pit) 31: Signal layer (pit and groove) 32: Signal layer (reflection film) 33: Signal layer (recording film) 34, 34 ': Signal layer (protective film) 4: Adhesive layer 5: Light transmitting layer 6: Lens 7: Laser beam

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08K 5/06 C08K 5/06 C08L 69/00 C08L 69/00 G11B 7/26 531 G11B 7/26 531 F Term (reference) 4F071 AA50 AC02 AC03 AC06 AF17Y AH12 BA02 BB02 BC01 4F100 AA20 AH02H AK45C AR00B AT00A BA03 BA07 BA10A BA10C EH46 EH462 EH66 EH662 JK15 JN01C JN18 4J002 CG001 EA066 GF0500 EA066 GF0500

Claims (7)

[Claims] The present invention has a substrate, a signal layer disposed on the substrate, and a light transmitting layer laminated on the signal layer, and allows writing and reading of recording by irradiating a laser beam from the light transmitting layer side. An optical information recording medium comprising: the light transmitting layer, based on 100 parts by weight of an aromatic polycarbonate resin,
An optical information recording medium comprising an aromatic polycarbonate resin composition containing 0.01 to 40 parts by weight of a compound represented by the following general formula [I]. Embedded image 2. The optical information recording medium according to claim 1, wherein the aromatic polycarbonate resin is a bisphenol A type polycarbonate represented by the following general formula [II]. Embedded image 3. The optical information recording medium according to claim 1, wherein a viscosity average molecular weight (M) of the aromatic polycarbonate resin is in a range of 15,000 to 120,000. 4. The method according to claim 1, wherein the flexural modulus of the aromatic polycarbonate resin composition is 2,300 Mpa to 6,000 Mpa as measured according to ASTM D790. The optical information recording medium according to the above. 5. The light-transmitting layer is a film prepared by a solution casting method.
The optical information recording medium according to any one of the above. 6. The compound represented by the general formula [I], wherein n is
The optical information recording medium according to any one of claims 1 to 5, wherein the optical information recording medium is 0 or 1. 7. The compound according to claim 1, wherein the substituent R of the compound represented by the general formula [I] is any one of a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms, and a methoxy group. The optical information recording medium according to claim 1.