JPH03162725A - Information recording medium case for housing information recording medium and production thereof - Google Patents

Abstract

PURPOSE:To provide an antistatic effect which can be maintained for long by forming antistatic layers consisting of a mixture composed of >=2 kinds of surfactants varying in mol. wt., directly or via resin layers, on the whole or part of the surfaces of substrates or the surfaces of thin-film layers. CONSTITUTION:The antistatic layers 10 are formed by applying the mixture composed of >=2 kinds of the surfactants varying in mol. wt., on the surfaces of hard coat layers 9. The surfactant molecules 13b of the small mol. wt. intrude among the surfactant molecules 13a of the large mol. wt. and both these molecules 13a, 13b support each other. The surfactant molecules (more particularly the surfactant molecules 13a of the large mol. wt.) have the less tendency to inclination by external disturbance and the polarity of the hydrophilic groups on the extreme surface layers are hardly degraded. The antistatic effect is maintained for long in this way.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to information recording media such as optical information recording media and magnetic recording media, cases for housing information recording media, and methods for manufacturing the same. In particular, it relates to preventing dust from adhering to the surface of a member.

[Conventional technology]

Generally, optical information recording media employs a method in which a light beam is irradiated from the substrate side onto a thin film layer formed on one side of a transparent substrate, including at least a recording film or a reflective film, and the reflected light is read as information. ．． Therefore, if foreign matter such as dust adheres to the surface of the transparent substrate, the amount of light beam reaching the thin film layer and the amount of light reflected from the thin film layer decreases, resulting in a decrease in the recording/recording speed.
Playback errors are more likely to occur.

Dust adhesion to a transparent substrate often occurs because dust in the air is attracted by static electricity to the high potential charged on the surface of the substrate. In addition to attracting dust, the electrical charge on the substrate surface also causes
When attached to a drive device, discharge may occur, which may cause problems such as recording/reproduction errors due to noise and damage to the signal processing circuit of the drive device.

In order to prevent such problems, optical information recording media have been proposed in which an antistatic film or a conductive film is coated on the surface of a transparent substrate or a thin film layer (Japanese Patent Laid-Open No. 61-27
No. 6145).

Although the above description has been made using an optical information recording medium as an example, other types of information recording media such as magnetic information recording media have also been proposed with an antistatic film attached thereto to prevent dust. .

[Problem to be solved by the invention]

Methods for forming an antistatic film on the surface of a transparent substrate, etc. include a method of applying a surfactant to the surface of the transparent substrate, etc., and a method of kneading a surfactant into the resin material constituting the transparent substrate, etc. be.

In this way, the lipophilic groups in the surfactant are adsorbed on the surface of the transparent substrate, etc., and the hydrophilic groups in the surfactant are arranged on the air side, and the hydrophilic groups are polarized in the outermost layer. Adsorbs moisture from the atmosphere. This moisture increases the surface conductivity of the transparent substrate, etc., and exhibits an antistatic effect.

However, when an antistatic layer is formed using one type of surfactant, the surface conductivity of the transparent substrate increases over time in a short period of time, and it is difficult to achieve a practically sufficient antistatic effect. On the other hand, information recording media in which a conductive film such as ITO is deposited on the surface of a substrate does not have the above-mentioned drawbacks, but it is difficult to form a conductive film without using a vacuum film method such as sputtering. This has the disadvantage that the manufacturing process becomes complicated and the manufacturing equipment becomes expensive.

The present invention has been made to solve the above-described drawbacks of the prior art, and its first purpose is to provide an information recording medium that can be implemented at low cost and has a long-lasting antistatic effect. .

A second object is to provide an information recording medium storage case suitable for storing information recording media.

Furthermore, a third object is to provide a method for manufacturing the above-mentioned information recording medium. In addition, a fourth object is to provide a method of manufacturing the above-mentioned information recording medium storage case. [Means for Solving the Problems] In order to achieve the first object, the present invention provides an information recording medium comprising at least one substrate and a thin film layer provided on one side of the substrate. An antistatic layer consisting of a mixture of two or more surfactants having different molecular weights was formed on at least all or part of the surface of the substrate or the surface of the thin film layer, either directly or via a resin layer. In addition, in order to achieve the second objective, in an information recording medium storage case formed from a resin material, at least the whole or part of the inner surface of the case in which the information recording medium is stored is coated with two or more types having different molecular weights. An antistatic layer was formed consisting of a mixture of surfactants.

Furthermore, in order to achieve the third objective, at least one
After forming an information recording medium composed of two substrates and an a-film layer formed on one side of the substrate, at least all or part of the surface of the substrate or the surface of the thin film layer is coated with
A mixture of two or more types of surfactants with different molecular desirability is applied directly or via a resin layer, and is then irradiated with ultraviolet rays of a predetermined wavelength and predetermined intensity. The surfactant was immobilized on the substrate or thin film layer or resin layer.

As another means for achieving the third object, after forming a recording single plate composed of one substrate and a thin film layer formed on one side of the substrate, at least on all or part of the surface or surface of the thin film layer,
Directly or via a resin layer, forming a tf antistatic layer consisting of a mixture of two or more types of surfactants with different molecular weights,
Afterwards, the desired information recording medium was assembled by bonding these recording veneers together. Also. In order to achieve the fourth object, after the information recording medium housing case of a predetermined shape is shaped, at least all or part of the inner surface of the case in which the information recording medium is housed is given chemical bond reactivity by ultraviolet rays. A mixture of two or more types of surfactants having different molecular members was applied, and then ultraviolet rays of a predetermined wavelength and a predetermined intensity were irradiated to fix the surfactant to the case surface.

[Effect]

The reason why the antistatic effect decreases in a short period of time when an antistatic layer is formed using one type of surfactant is that the surfactant molecules aligned perpendicularly to the surface of the transparent substrate, etc. Chemical disturbances such as mechanical friction and heating cause the transparent substrate to fall in a direction parallel to the surface, resulting in insufficient polarization of the hydrophilic groups generated in the outermost layer, reducing the amount of water adsorbed, and causing the surface to collapse. This is presumed to be due to an increase in electrical conductivity.

On the other hand, when an antistatic layer is formed using a mixture of two or more types of surfactants with different molecular weights, surfactant molecules with large molecular weights and surfactant molecules with small molecular weights support each other, so they are not easily affected by external disturbances. The surfactant molecules are less likely to tilt even when used, and the antistatic effect can be maintained for a long time.

In addition, to form an antistatic film, it is sufficient to apply a surfactant directly to the object to be coated, or simply apply a mixture of a surfactant mixed with a resin to the object and then irradiate it with ultraviolet rays. Compared to the method of forming a conductive film using a vacuum deposition method, the manufacturing equipment and manufacturing process can be simplified. Therefore, mass productivity is improved, and an information recording medium with excellent antistatic properties and a case for storing the information recording medium can be provided at low cost.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an optical information recording medium according to a first embodiment, in which two thin film layers 3 including at least a recording film or a reflective film are laminated on a signal surface 2 of a transparent resin substrate 1. An inner circumferential spacer 7 sufficient to hold the optical disc single plates 4 and 5 with the thin film layer 3 inside and to form a gap 6 between the thin film layers 3.
and an antistatic layer 10 is formed on the outer surface (laser beam incident surface) of the transparent resin substrate 1 with a hard coat layer 9 interposed therebetween.

The transparent resin substrate 1 is made of a resin material with high transparency and low optical distortion, such as polycarbonate, polymethyl methacrylate, polymethyl pentene, epoxy, or ultraviolet curable resin. Resin transparent substrate 1
The molding means is adjusted as appropriate depending on the resin material used. For example, injection molding can be applied to thermoplastic resins such as polycarbonate, and casting methods can be applied to thermosetting resins such as epoxy and ultraviolet curable resins. On the signal surface 2, a preformat pattern such as a guide groove for guiding a light beam and a pre-pit row for displaying an information signal is formed in a fine uneven shape.

The thin film layer 3 is formed of an appropriate material depending on the frequency of insertion of the optical disc. For example, a write-once type optical disc or a 7F conversion type optical disc is formed to include at least a recording film made of a heat moat recording material, and a read-only type optical disc is formed to include a reflective film made of aluminum or the like.

The film structure of the thin film scrap 3 is also adjusted as appropriate depending on the insertion of the optical disc. For example, an optical disc having a perforated recording film may have a two-layer structure consisting of a recording film and a base film, such as nitrocellulose, for improving the recording sensitivity of the recording film. Regarding an optical disk equipped with a magneto-optical recording film, from the substrate 1 side, a first enhancement film having a high refractive index, a magneto-optical recording film, and a second enhancement film made of the same material as the first enhancement film. It can have a five-layer structure consisting of a reflective film and a protective film made of a moisture-resistant resin material.

The hard coat yPj9 is formed of a transparent resin material that is harder than the transparent resin substrate l. The resin material that can be used for this purpose is that it can be carried out with simple equipment,
Ultraviolet curable resins are particularly suitable because they can be quickly solidified. The antistatic layer 10 can be formed by coating the surface of the hard coat layer 9 with a mixture of two or more types of surfactants having different molecular weights, or
Either a mixture of two or more types of surfactants with different molecular weights is uniformly kneaded in an ultraviolet curable resin and applied to the surface of the hard coat layer 9, or a mixture of two or more types of surfactants with different molecular weights is applied to the surface of the hard coat layer 9. It is formed by uniformly kneading a mixture of surfactants. The surfactant to be mixed can be arbitrarily selected from any known surfactants, but it is preferable to use surfactants that have good adhesion to the resin material constituting the transparent substrate 1 and the hard coat layer 9. , a cationic surfactant exemplified by the following molecular structural formula (A), the following molecular structural formulas (B) to (I)
The anionic surfactant exemplified by the following molecular structure formula (
It is particularly preferable to use a surfactant imparted with chemical bond reactivity by ultraviolet rays, such as nonionic surfactants exemplified in J) to (M). Molecular structural formula (A) Molecular structural formula (B) Molecular structural formula (C) Molecular structural formula (D) C H a l Molecular structural formula (E) Molecular structural formula (F) Molecular structural formula (G) ■3 L ．． H3 H3 Molecular structural formula (H) T-structural formula (1) 011 Molecular structural formula (J) C H 3 l CTIz = c-c O-C+Iz11 0 CHz ○ I Molecule ut'Jti formula (K) Molecule Structural formula (L) O 11 0 Molecular structure (M) R-@-○(C}l z Cl-{ 2 0) n CO
Below, a method for manufacturing the optical disk of the first embodiment will be explained with reference to FIGS. 2(a) to 2(d).

First, as shown in FIG. 2(a), two optical disk single plates 5 and 6 are bonded together to form an optical disk with an air sandwich structure.Next, as shown in FIG. 2(b), An ultraviolet curable resin layer 11 is formed on the outer surface of a transparent resin substrate 1, which will become the basis of a hard coat layer 9. Before curing the ultraviolet curable resin layer 11, as shown in FIG.
), a mixture 12 of two or more types of surfactants having different molecular weights is applied.

Thereafter, as shown in FIG. 2(d), the optical disc is irradiated with curing light of a predetermined wavelength and predetermined intensity to cure the ultraviolet curable resin layer 11 and form the hard coat layer 9. An antistatic layer 10 made of a mixture of two or more types of surfactants having different molecular weights is fixed on the hard coat layer 9.

In addition, in the above method, the surfactant 12 was applied on the ultraviolet curable resin Mj11 before curing the ultraviolet curable resin layer l1, but the surfactant 12 is applied after the ultraviolet curable resin layer II is cured. You can also do that.

In addition, in the above method, a mixture of two or more types of surfactants with different molecular weights was applied on the ultraviolet curable resin layer 11, but the mixture of two or more types of surfactants with different molecular weights is UV curable. It is also possible to apply a mixture uniformly kneaded into the resin onto the ultraviolet curable resin 11 constituting the hard coat layer 9; It is also possible to uniformly knead a mixture of two or more different types of surfactants.

Further, in the embodiment described above, the hard coat layer 9 and the antistatic layer 10 were formed after the optical disk with the air sand inch structure was assembled, but these layers 9 and 10 were formed at the stage of forming the optical disk single plates 4 and 5. It is also possible to assemble the optical disc having the desired air sandwich structure after a certain time.

In the optical disc of the first embodiment, the antistatic layer was formed using a mixture of two or more types of surfactants with different molecular weights, so as shown in FIG. Surfactant molecules with small molecular weight 13
b enters, and both molecules 13a and 13b support each other. Therefore, the surfactant molecules (especially the surfactant molecules 13a with a large molecular weight) are tilted by disturbance, and the polarization of the hydrophilic groups in the outermost layer is less likely to decrease, so the antistatic effect can be maintained for a long time. .

In addition, since the surfactant is coated on the hard coat layer 9 made of an ultraviolet curable resin, polymerization such as random copolymerization or graft copolymerization occurs between the hard coat layer 9 and the surfactant 12 due to the energy of ultraviolet rays. A reaction occurs, and the surfactant mixture 12 is firmly fixed onto the hard coat layer 9.

Therefore, even when subjected to chemical disturbances such as mechanical friction or heating, the surfactant 12 is difficult to fall off from the hard coat layer 9, and from this point as well, the antistatic effect can be maintained for a long time.

The table below shows the concentration of the surfactant applied to the surface of the hard coat layer 9, the number of layers of surfactant molecules at each concentration,
The surface resistivity value of the surface of the hard coat layer 9 is shown.

It has been confirmed through experiments that in order to prevent the adsorption of dust in the air to the hard coat layer 9, the surface resistivity value needs to be approximately IX10 (Ω) or less. Therefore, from the above table, in order to obtain the desired dustproof effect, the concentration of the surfactant applied to the surface of the hard coat scrap 9 should be 0.50X10-"-1.OOXIO-' (mg/
It can be seen that it is necessary to set the value to be equal to or greater than cm').

FIG. 4 shows the relationship between the addition rate of the surfactant mixed into the ultraviolet curable resin and the surface resistance value of the hard coat layer 9 on which the antistatic layer 10 of each composition is formed. Sample 1 uses mono(2-acryloxyethyl) acitoffate (anionic surfactant; expressed as PA) in ultraviolet curable resin 30X-40 manufactured by ThreeBond Co., Ltd.
In sample 2, mono(methacrylicoxyethyl)acytoffate (anionic surfactant; expressed as PM) was added to ultraviolet curable resin 30X-40 manufactured by ThreeBond Co., Ltd. It was added to 0. As mentioned above, in order to prevent the adsorption of dust in the air to the hard coat layer 9, the surface resistivity value needs to be approximately lX10'' (Ω) or less. Therefore, from FIG. The samples also show that the desired dust-proofing effect can be achieved by adding about 10% or more of a surfactant to the ultraviolet curable resin.

FIG. 5 shows the environmental resistance test results of the antistatic layer 10. The test was conducted by leaving an optical disc in which an antistatic layer 10 was formed on a hard coat layer 9 in an environment of 50° C. and 15% RH.

Sample 1 is a 14% isopropyl alcohol solution of PA,
Sample 2 was coated with a 14% isopropyl alcohol solution of PA on hard coat layer 9 to a thickness of 3 μm.
Sample 3 is UV curable resin 3 manufactured by ThreeBond Co., Ltd., which is coated on hard coat layer 9 to a thickness of 2 μm.
0X-400 with 10% PA added, Sample 4 is UV curable resin 3 manufactured by ThreeBond Co., Ltd.
This is 0X-400 with 20% PA added.

As mentioned above, in order to prevent the adsorption of dust in the air to the hard coat layer 9, the surface resistivity value should be set to approximately 1×
10" (Ω) or less is sufficient. Additionally, in general, it is rare to drive an optical disc continuously for more than 24 hours, considering the recording capacity of the optical disc. As shown in Figure 5, any sample After 40 to 50 hours had elapsed, the surface resistance value became less than io'' (Ω), indicating that there was a practically sufficient antistatic effect.

Various modifications of the present invention are shown below. ■As shown in FIG. 6, the hard coat layer 9 is formed not only on the surface 1a of the transparent substrate 1 facing the thin film layer forming surface, but also on the outer peripheral surface 1b of the transparent substrate 1 and the outer peripheral surface 7a of the outer peripheral spacer 7. , an antistatic layer 10 is formed on the entire outer surface of the optical disc.

(2) As shown in FIG. 7, an antistatic layer 10 is formed directly on the outer surface (la and/or lb) of a transparent substrate l. Such an optical disk is produced by coating the outer surface of the transparent substrate 1 with a mixture of two or more types of surfactants having different molecular weights, and then subjecting the mixture to a specialized assimilation treatment, such as irradiation with ultraviolet rays.
A surfactant can be fixed to the surface of the transparent wall plate.

■As shown in FIG. 8, in an optical disc having a so-called close bonding structure in which the surfaces on which the thin film layer 3 of the optical disc single plates 4 and 5 are bonded via an adhesive layer 15, an antistatic layer 10 is formed on a transparent substrate l. Form. Although FIG. 8 shows the case where the antistatic layer 10 is formed directly on the transparent substrate l, the antistatic layer 10 can also be formed through a hard coat layer made of an ultraviolet curable resin or the like. ■As shown in FIG. 9, in an optical disc having a so-called single-plate structure, which is composed of a single optical disc 4 or 5 and a protective layer 16 is formed to cover the thin film layer 3, An antistatic layer 10 is formed. Although FIG. 9 shows the case where the antistatic layer 10 is formed directly on the transparent substrate 1, the antistatic layer 10 can also be formed through a resin layer made of an ultraviolet curable resin or the like. ■As shown in FIG. 10, in an optical disc with a so-called single-plate structure, which is composed of one optical disc single plate 4 and a protective layer l6 is formed to cover the thin film layer 3, the protective layer 16 is
An antistatic layer 10 is formed thereon. Although FIG. 10 shows the case where the antistatic layer 10 is formed directly on the protective layer 16, the antistatic layer 10 can also be formed through a resin layer made of an ultraviolet curable resin or the like.

■As shown in FIG. 11, in an optical disc with a so-called single-plate structure, which is composed of one optical disc single plate 4 and a protective layer 16 is formed to cover the thin film layer 3, the protective layer 16
Then, an antistatic layer IO is formed on the entire outer surface of the transparent substrate 1. Although FIG. 11 shows the case where the antistatic layer 10 is formed directly on the protective layer 16 and the transparent substrate l,
The antistatic dust 10 can also be formed via a resin layer made of an ultraviolet curable resin or the like.

■As shown in Figure 12, a center hub 1 made of wear-resistant material or magnetic material is placed in the center of the transparent substrate l.
Add 7. (2) It can also be applied to magnetic recording media and other types of information recording media whose substrates are made of glass or opaque materials.

Hereinafter, the structure of the information recording medium storage case and its manufacturing method will be explained.

FIG. 13 is a perspective view showing an example of an information recording medium storage case, and FIG. 14 is a sectional view of this information recording medium storage case.

As shown in these figures. This information recording medium storage case is constructed by joining an upper case 2l and a lower case 22 formed in the shape of a shallow dish, and an antistatic layer 10 is formed on the inner surface in which the information recording medium 23 is stored. ing. In the figure, reference numeral 24 indicates a spindle insertion hole for inserting a spindle for driving a medium into the case, 25 indicates a head insertion hole for inserting a recording/reproducing head into the case, and 26 indicates a through hole 24 for these holes. , 25 is shown.

The antistatic layer 10 is formed directly on the case surface.

This antistatic layer 10 is formed from a mixture of two or more types of surfactants having different molecular weights, as in the previous embodiment. The type of surfactant, the type of UV-curable resin to which the surfactant is added, and the addition rate are the same as described above.

When forming the antistatic layer 10 on the case surface, after forming the upper case 21 and the lower case 22 in a predetermined shape, a mixture of two or more types of surfactants having different molecular weights is applied to the desired surface, for example. The surfactant is fixed to the case surface by applying an assimilation treatment such as irradiation with ultraviolet rays. Thereafter, the desired information recording medium is stored inside, the upper case 21 and the lower case 22 are joined together, and the shirt cover 25 is attached to form the desired information recording medium storage case. In the above embodiment, the antistatic layer 1o was formed only on the inner surfaces of the upper case 21 and the lower case 22, but the upper case 2l and the lower case An antistatic layer 1o may also be formed on the outer surface of the case 22. In addition, in the above embodiment, a surfactant was applied to the surfaces of the upper case 2I and the lower case 22, but the upper case 2I
1 and the lower case 22 may contain a surfactant. Also in the case for storing information recording media, since the antistatic WIO is formed from a mixture of two or more surfactants with different molecular weights, the antistatic effect lasts for a long time.

〔Effect of the invention〕

As explained above, according to the present invention, since the antistatic layer is formed using a mixture of two or more types of surfactants having different molecular weights, the surfactant molecules have a large molecular weight and the surfactant molecules have a small molecular weight. The surfactant molecules support each other, making it difficult for the surfactant molecules to tilt even when subjected to external disturbances. Therefore, the polarization of the hydrophilic groups on the outermost surface and the adsorption of moisture in the atmosphere do not decrease, so the antistatic effect lasts for a long time. In addition, the antistatic layer can be formed by applying a surfactant directly to the object to be coated, or by applying a surfactant mixed into a resin and then applying a solidification process such as irradiation with ultraviolet rays. Since it is only necessary to apply , it is possible to simplify the manufacturing equipment and the manufacturing process compared to a method in which a conductive film is formed using a vacuum film forming method. Therefore, mass productivity is improved,
An information recording medium with excellent antistatic properties and a case for storing the information recording medium can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the optical information recording medium according to the first embodiment, FIGS. 2(a) to (d) are manufacturing process diagrams of the optical information recording medium according to the first embodiment, and FIG. An explanatory diagram schematically showing the arrangement state of different surfactants, Figure 4 is a graph diagram showing the relationship between the addition rate of surfactant mixed in the ultraviolet curable resin and the surface resistance value of the hard coat layer, FIG. 5 is a graph showing the environmental resistance test results of the antistatic layer, FIGS. 6 to 12 are cross-sectional views showing modifications of the present invention, and FIG. 13 is a perspective view of an information recording medium storage case. Figure 14 is a sectional view of the information recording medium storage case. 1... Transparent substrate, 2... Signal surface, 3... Thin film layer, 4
, 5... Optical disk single plate, 9... Hard coat layer, 10... Antistatic layer, 21.22
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Claims (1)

[Scope of Claims] (1) In an information recording medium composed of at least one substrate and a thin film layer provided on one side of the substrate, at least all or part of the surface of the substrate or the surface of the thin film layer. An information recording medium characterized in that an antistatic layer comprising a mixture of two or more types of surfactants having different molecular weights is formed directly or via a resin layer. (2) In claim 1, as the surfactant,
An information recording medium characterized by using a material that has been given chemical bond reactivity by ultraviolet rays. (3) In claim 2, the surfactant imparted with chemical bond reactivity by ultraviolet rays is a surfactant selected from cationic surfactants, anionic surfactants, and nonionic surfactants. An information recording medium characterized by the use of (4) In claim 1, the substrate is formed from a transparent resin material, and these two transparent substrates are bonded together with the thin film layer inside, and at least the laser beam incident surface of these transparent substrates is provided with the substrate. An information recording medium characterized in that an antistatic layer made of a mixture of two or more types of surfactants having different molecular weights is formed through a resin layer that is harder than the resin material forming the information recording medium. (5) In claim 1, the substrate is formed from a transparent resin material, and the two or more types of interfaces having different molecular weights are formed on the surface of a thin film layer formed on at least one side of the transparent substrate, with the resin layer interposed therebetween. An information recording medium comprising an antistatic layer made of a mixture of activators. (6) In either of claims 4 and 5, a mixture of two or more types of surfactants having different molecular weights is kneaded in the resin layer, and the surfactant exposed on the surface of the resin layer An information recording medium characterized in that the antistatic layer is formed of a mixture of agents. (7) In any one of claims 4 and 5, the charging method includes a mixture of two or more types of surfactants having different molecular weights applied to the surface of the resin layer in which the surfactant is not kneaded. An information recording medium characterized in that a prevention layer is formed. (8) The information recording medium according to claim 4 or 5, wherein the resin layer is formed of an ultraviolet curable resin. (9) In claim 1, the substrate is formed from a transparent resin material, and these two transparent substrates are bonded together with the thin film layer inside, and the molecular weight An information recording medium characterized in that the antistatic layer is formed by coating two or more types of surfactants having different values. (10) In claim 1, the substrate is formed from a transparent resin material, and the mixture of two or more types of surfactants having different molecular weights is coated on the surface of a thin film layer formed on at least one side of the transparent substrate. An information recording medium characterized by forming an antistatic layer consisting of: (11) In claim 1, the substrate is formed of an opaque material, and two or more types of surfactants having different molecular weights are applied to at least all or part of the surface of the opaque substrate, directly or via a resin layer. An information recording medium comprising an antistatic layer formed of a mixture of. (12) In an information recording medium storage case made of a resin material, at least all or part of the inner surface of the case in which the information recording medium is stored is charged with a mixture of two or more types of surfactants having different molecular weights. A case for storing information recording media, characterized by forming a prevention layer. (13) After forming an information recording medium comprising at least one substrate and a thin film layer formed on one side of the substrate, at least all or part of the surface of the substrate or the surface of the thin film layer is , 2 with different molecular weights that have been given chemical bond reactivity by ultraviolet light either directly or through a resin layer.
Information characterized in that a mixture of more than one type of surfactant is applied, and then this mixture is irradiated with ultraviolet rays to fix the surfactant on the substrate, thin film layer, or resin layer. A method for manufacturing a recording medium. (14) In the thirteenth aspect, when forming the antistatic layer on the resin layer, first, an ultraviolet curable resin is applied to a desired portion, and before the ultraviolet curable resin is cured, the ultraviolet curable resin layer is By applying a mixture of two or more types of surfactants with different molecular weights, which have been given chemical bond reactivity by ultraviolet rays, and irradiating them with curing light of a predetermined wavelength and predetermined intensity, the ultraviolet curable resin is cured. A method for manufacturing an information recording medium, characterized in that the surfactant is fixed on the ultraviolet curable resin layer at the same time as the layer is cured. (15) In claim 13, when forming the antistatic layer on the resin layer, first, a desired portion is coated with an ultraviolet curable resin, and then curing light of a predetermined wavelength and a predetermined intensity is irradiated. The ultraviolet curable resin layer is cured, and then a mixture of two or more types of surfactants with different molecular weights that have been given chemical bond reactivity by ultraviolet rays is coated on the ultraviolet curable resin layer. A method for manufacturing an information recording medium, characterized in that the surfactant is fixed on the ultraviolet curable resin layer by irradiating ultraviolet rays of a predetermined intensity. (16) In claim 13, when forming the antistatic layer on the resin layer, a mixture of two or more types of surfactants having different molecular weights and having chemical bond reactivity imparted to desired portions by ultraviolet rays is uniformly used. After applying an ultraviolet curable resin kneaded into the resin layer and curing this ultraviolet curable resin by irradiating it with ultraviolet rays of a predetermined wavelength and predetermined intensity, a part of the surfactant is applied to the surface of this resin layer. A method for manufacturing an information recording medium, characterized in that it is exposed over time. (17) After forming a recording single plate composed of one substrate and a thin film layer formed on one side of the substrate, at least all or a part of the surface of the substrate or the surface of the thin film layer, By forming an antistatic layer made of a mixture of two or more types of surfactants with different molecular weights directly or via a resin layer, and then bonding these recording veneers together, a desired information recording medium can be formed. 1. A method for manufacturing an information recording medium, comprising: assembling. (18) After molding an information recording medium housing case of a predetermined shape, at least all or a part of the inner surface of the case in which the information recording medium is housed is made of two or more types of different molecular weights that have been given chemical bond reactivity by ultraviolet rays. A method for producing a case for storing an information recording medium, characterized in that the surfactant is fixed to the case surface by applying a mixture of surfactants and irradiating the mixture with ultraviolet rays. .