JPH07254169A - Surface-treated substrate - Google Patents

Abstract

PURPOSE:To obtain a surface-treated substrate in which the treatment for imparting electric conductivity and reducing surface energy, is effectively attained so as to be capable of preventing not only contamination due to electrification but also contamination due to the sticking of water-soluble sticky matter, oily sticky matter or dust particles from in a highly humid environment and to obtain an optical recording medium using the surface-treated substrate. CONSTITUTION:A coating layer is formed on the surface of a substrate or the surface of an org. protective film formed on the substrate by coating the surface with a compd. having a reactive group and a functional group having at least one of water repellency and oil repellency in each molecule and then irradiating the compd. with reactive active energy beams.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface-treated substrate for an optical material, and more specifically, a surface water repellent,
The present invention relates to a surface-treated substrate that has been subjected to oil-repellent or water-repellent-oil-repellent treatment and conductive treatment, and an optical recording medium using the same.

[0002]

2. Description of the Related Art Currently,
As optical materials such as optical disk substrates and lenses, polycarbonate and acrylic materials are often used because of their excellent moldability and transparency, but these materials have insufficient surface scratch resistance and high insulation. Therefore, there is a problem in that it is easily charged and dust is likely to be attached, and is easily scratched. Therefore, in practical use, a hard coat having a transparent surface, which has both scratch resistance and antistatic property, has been studied.

By the way, the stains on the substrate surface are not limited to those caused by charging. For example, stains other than electrification may be water-soluble sticky substances, oily sticky substances, or stains caused by the attachment of dust particles due to the liquid crosslinking force in a high humidity environment. Antistatic is an important factor in low-humidity environments, but with the spread of optical discs for consumer use, it becomes important to prevent dirt due to liquid crosslinking in high-humidity environments and oil-based dirt such as oil mist in the air. There is. In order to prevent such new contamination or to easily remove stains, it is necessary to make the surface conductive and reduce the surface energy.

Further, such a treatment for making the surface conductive and lowering the surface energy is effective not only on the pickup side of the laser beam of the optical disk but also on the recording film side. Assuming a magnetic field modulation type magneto-optical disk,
The magnetic field head runs on the recording film side of the magneto-optical disk, specifically, the organic protective film coated on the recording layer. Crash may occur. Therefore, it is required to reduce the surface energy of the surface of the protective film. Further, the conductive treatment is effective in promptly eliminating static electricity generated by friction between the head and the surface. Therefore, the conductive and low surface energy treatment becomes an important problem not only on the pickup side but also on the recording film side.

Therefore, an object of the present invention is to effectively carry out a treatment for reducing electric conductivity and lowering surface energy, and not only stains caused by electrification but also water-soluble adhesives, oily adhesives, or high humidity environments can be used. It is an object of the present invention to provide a surface-treated substrate capable of preventing dirt and the like due to adhesion of dust particles due to liquid crosslinking force, and an optical recording medium using the same.

[0006]

Means for Solving the Problems As a result of diligent research, the present inventors have found that a compound (C) having a functional group having water repellency, oil repellency, water repellency and oil repellency, and a reactive group is used to form a base material (S). When the surface is covered, it has a strong bond (chemical bond) with the base material (S), and the surface is extremely effectively subjected to the surface energy reduction treatment, and by forming a conductive layer on the underlayer, the conductive is effectively conducted. It has been found that the surface of the base material (S) achieves the above object by being excellent in stain resistance even in low humidity and high humidity.

That is, the present invention has been made on the basis of the above findings, and the surface of the base material (S) or the surface of the organic protective film (A) formed on the base material is provided with water repellency and A coating layer (C) obtained by coating a functional group (H) having at least one function of oil repellency and a reactive group (R) in a molecule and irradiating with a reaction active energy ray is formed. The present invention provides a surface-treated substrate for an optical material characterized by the above.

The surface-treated substrate according to the present invention and the optical recording medium using the same will be described in detail below. The substrate (S) used for the surface-treated substrate according to the present invention is an inorganic substrate such as glass or an organic substrate such as a resin and is not particularly limited. For example, a resin having versatility and transparency such as polycarbonate Can be used. Therefore, the surface of the substrate (S) is
It may be a pickup side as an optical recording medium, a recording layer, or an overcoat or a hard coat surface coated on the recording layer.

When a coating layer is formed on the surface of the substrate (S),
The coating layer may be formed directly on the surface of the base material (S) (including the surface of the recording layer, etc.), but it may be desirable to provide it after interposing the organic protective film (A). The resin of the organic protective film (A) is not particularly limited as long as it is a conventionally used protective resin, and may be a commonly used protective coat resin. However, in the present invention, the pencil hardness is particularly H or higher. The protective resin described below, which forms the film, is desirable. Also,
As for the method of forming the organic protective film (A), it is desirable that the surface is coated and then the film is formed by ultraviolet rays, electron beam curing or the like in consideration of simplification of the process.

The organic protective film (A) has a scratch resistance of the layer surface,
As a material for exhibiting the surface protection effect of the base material (S), 1
It is desirable to contain two or more crosslinkable functional groups in the molecule, and one or two of the following (meth) acrylates may be included.
It is possible to appropriately select and use one or more species.

Examples of the cross-linkable polyfunctional acrylic acid ester include trimethylolpropane tri (meth) acrylate, trimethylolethanetri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, as trifunctional or higher functional. Glycerin tri (meta)
Examples thereof include acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate and ethylene oxide and propylene oxide modified products thereof.

The bifunctional compounds include 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, and diethylene glycol di (meth) acrylate. ) Acrylate, polyethylene glycol di (meth)
Examples thereof include acrylate, neopentyl glycol dimethacrylate, cyclopentadienyl alcohol di (meth) acrylate and the like.

Examples of the (meth) acrylate other than the polyfunctional ester include polyester poly (meth) acrylate, epoxy (meth) acrylate, urethane poly (meth) acrylate, polysiloxane poly (meth) acrylate, polyamide poly (meth) acrylate. Etc.

Further, before actually forming the organic protective film (A) by coating, it promotes the solubility of the antistatic copolymer,
A monofunctional acrylate may be added for the purpose of increasing the viscosity and improving the adhesion to the substrate. As such a monofunctional acrylate, 2-hydroxyethyl (meth) acrylate,
2-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxypentyl (meth) acrylate, 4-hydroxypentyl (meth) acrylate and 2-ethylhexyl (meth ) Acrylate, ethoxyethyl (meth) acrylate, N-hydroxymethyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide and the like. The amount of these monofunctional acrylates used is 0 to 40% by weight, and 0 to 30% by weight in consideration of scratch resistance and the like.

It is not necessary to cure the organic protective film (A) with an electron beam, γ-ray or the like, but when it is carried out by an ultraviolet curable type in consideration of practicality, it is carried out by adding a photopolymerization initiator. As the photopolymerization initiator, acetophenone-based photopolymerization initiators such as 4-phenoxydichloroacetophenone, 4-t-butyldichloroacetophenone, diethoxyacetophenone, and 2-hydroxy-2-methyl-phenylpyropan-1-one. Examples thereof include benzoin-based photopolymerization initiators such as penzoin methyl ether, penzoin isopropyl ether, and benzyl dimethyl ketal, and thioxanthone photopolymerization initiators such as thioxanthone. The photopolymerization initiator is 1
It may be one kind or two or more kinds, and the amount thereof is preferably 10 parts by weight or less based on 100 parts by weight of the protective resin. Further, in order to obtain a desired film thickness, the coating may be performed by diluting with a solvent such as methanol, ethanol or isopropyl alcohol at the time of coating.

Coating layer (C) of the surface-treated substrate according to the present invention
Is formed on the surface of the base material (S) or the surface of the organic protective film (A) and chemically bonds to the functional group (H) having at least one of the water-repellent and oil-repellent functions and the surface of the base material (S). And a compound having a reactive group (R). Examples of the reactive group (R) include (meth) acryloyl group (including acrylamide group), vinyl group, epoxy group, allyl group and silane group. Examples of the functional group (H) having a water-repellent property, an oil-repellent property, or a water-oil-repellent function include a fluorocarbon chain, a hydrocarbon chain, a dimethylsiloxane chain and the like. Then, as the compound having the functional group (H) and the reactive group (R), the compounds of the following chemical formulas 1 to 3 are specifically mentioned.

[0017]

[Chemical 1]

[0018]

[Chemical 2]

[0019]

[Chemical 3]

As a reaction treatment method corresponding to these reactive groups (R), reaction activation energy ray treatment, heat treatment and the like are conceivable. However, considering the simplicity of the process, damage to the substrate (S), etc., the reaction The compound having a (meth) acryloyl group or a vinyl group as the group (R) is not particularly limited to reaction activation energy rays (ultraviolet rays, electron rays, γ rays, X rays, plasma properties, etc.), but considering the simplicity of the process. Then, it is desirable to treat with ultraviolet rays or electron beams.

Specifically, the monomer as the above compound is dissolved in a solvent to prepare a treatment solution, and the treatment solution is coated on the surface of the substrate (S) by spin coating, dip coating, or the like, and then the reaction activation energy ray is applied. Specifically, it is irradiated with ultraviolet rays, electron beams, radiation, X-rays, plasma rays, etc., and thereafter, the monomer and oligomer components that have not formed a chemical bond with the surface of the substrate (S) are removed by washing. In the UV irradiation, there is no problem in the usual atmosphere, but it is desirable to irradiate under a nitrogen stream in order to improve the reaction efficiency.

Further, the photopolymerization initiator in the solution is preferably 0.1 to 20% by weight, preferably 1 to 5% by weight, based on the above-mentioned monomers, and the kind of the photoinitiator is 4-foxydichloroacetophenone or 4-t. -Butyldichloroacetophenone, diethoxyacetophenone, 2-hydroxy-2-
Acetophenone polymerization initiators such as methyl-phenylpropan-1-one, benzoin methyl ether, benzoin isopropyl ether, benzoin photopolymerization initiators such as benzyl dimethyl ketal, thioxanthone, 2
Examples of the thioxanthone-based photopolymerization initiator include chlorothioxanthone, 2,4-dimethylthioxanthone, and 2,4-diethylthioxanthone.
It does not matter if there are two or more species.

Before coating the above treatment solution, the surface of the substrate (S) is treated with active energy rays (ultraviolet, electron beam,
If plasma is used, the anion (cation) treatment becomes easier. Further, if a mask having a desired pattern is used at the time of activating the active energy ray, only a necessary portion can be processed.

In the surface-treated substrate according to the present invention, the conductive layer (B) is formed between the surface of the substrate (S) or the organic protective film (A) and the coating layer (C). Is desirable. Such a conductive layer (B) effectively works to remove static electricity on the surface of the surface-treated substrate even when the coating layer (C) is formed. That is, the conductive layer (B) functions as a ground for the water-repellent and oil-repellent layer to release static electricity generated on the surface.

The conductive layer (B) has a surface resistance value of 10 ¹³ Ω / □.
It is not particularly limited as long as it is less than or equal to the order, preferably less than or equal to the order of 10 ¹² Ω / □, but optically transparent is desirable. Typical examples of the conductive layer (B) include:
The inorganic transparent conductive film can be formed by a thin film forming means such as a vapor deposition method or a sputtering method or a coating method, and its material is indium oxide, tin oxide, indium tin oxide (I
(TO), cadmium tin oxide, cadmium oxide, and other transparent conductive oxides are selected. These oxides are not only transparent conductive, but also have high surface hardness characteristics, and are also excellent in adhesiveness with a resin substrate. The film thickness (or layer thickness) is 10-100Å, preferably 20-5
It is recommended to set it within the range of 0Å.

As another material applied to the conductive layer (B), a method of coating an organic antistatic agent, for example, π-conjugated conductive or charge transfer type complex can be mentioned. First,
Typical examples of the π-conjugated conductive material include polyvirol, polythiophene, poly-p-phenylene, polyaniline, polyparaphenylene, polypyrene, polyazulene, polyfuran, polyselenophene, polypiperazine,
Alternatively, these derivatives may be mentioned. Further, in consideration of adhesion to the base material as well, a polyion having an anion (cation) group in the structure is desirable. Specific examples include those of the following chemical formula 4.

[0027]

[Chemical 4]

When the conductive polyanion is laminated,
When a conductive polycation is laminated alternately with a polycation (polyallylamine etc.), it is necessary to be laminated alternately with a polyanion (polystyrene sulfonic acid etc.).
As for the treatment method, it is considered that a solvent-soluble substance (polyaniline, alkyl-substituted polypyrrole, alkyl-substituted polythiophene derivative, etc.) is subjected to a coating treatment after being diluted with a solvent, but an insoluble substance is directly subjected to a polymerization treatment on the surface of the substrate (S). Method is preferable. In this case, a polypyrrole compound is preferable in terms of polymerizability and conductivity.

The oxidizing agent during the polymerization is not particularly limited, such as ferric salt, ammonium peroxodisulfate, cupric chloride, etc., but a ferric salt is desirable, and considering durability, ferric alkylbenzene sulfonate Is desirable. A ferric salt or the like may be used as the oxidizing agent, and paratoluenesulfonic acid, anthraquinonesulfonic acid, or the like may be added at the time of polymerization. The polymerization treatment method is a method in which a pyrrole monomer and an oxidizing agent are dissolved in a solvent, and a substrate having an anionic group introduced therein is immersed in the solution to polymerize a polymer on the surface, or, first, a solution in which an oxidizing agent is dissolved. The base material (S) is immersed in the solution, the surface is adsorbed with an oxidizing agent, and then the solution is immersed in a solution in which a monomer is dissolved, or the surface is exposed to steam to polymerize the polymer on the surface. After impregnating the surface of the material (S) or the like, a method of contacting with an oxidant can be considered.

The film-forming method is such that a solvent-soluble one is dissolved in a solvent for coating, or a non-soluble one is π.
A method of dispersing a monomer for producing a conjugated polymer and an appropriate oxidizing agent in a solution, immersing the substrate (S) in the dispersion, and coating the surface of the substrate (S) with the π-conjugated polymer, or Examples include a method of coating the base material (S) with an oxidizing agent, exposing the base material (S) to a monomer vapor, and coating the conductive film. Further, it is desirable to introduce an anion (cation) group on the surface of the base material (S) to control the surface charge in order to improve the adsorptive power before conducting the conductive treatment with the polymer.

Next, the charge transfer complex type material is a complex composed of a nonionic electron-donating compound (D) and a nonionic electron-accepting compound (Ac), and is a representative of the compound (D). Examples thereof include tetrathiafulvalene, tetramethyltetraselenafulvalene, bis (ethylenedithio) tetrathiafulvalene, and typical examples of the compound (Ac) include tetrazianoquinodimethane (TCNQ), tetracyanoethylene, and a compound thereof. There are derivatives and the like, and especially TCNQ complex is generally used. Specific examples of the complex include a TCNQ / quinoline derivative, a TCNQ / isoquinoline derivative, a TCNQ / pyridine derivative, and the film-forming method is to add these complexes and an appropriate binder, dilute with a solvent, and apply coating. .

Further, the conductive layer (B) may be a conductive layer obtained by adding at least one of a conductive filler and an organic antistatic agent to the above organic protective film (A). Specifically, for the organic protective film (A), the above-mentioned conductive oxide such as IT
O (indium tin oxide), tin oxide, or other conductive fillers (particle size 5 to 1000 A) added to the particles, or the above π-conjugated polymer, charge transfer complex, and surfactant-based antistatic Is to add an organic antistatic agent such as an agent. The surfactant-based antistatic agent to be added is preferably a quaternary ammonium salt-based antistatic agent, more preferably one having a hydrocarbon group having 4 or more carbon atoms, a quaternary ammonium group, or an ethylene oxide group in the molecular structure. . The main examples are shown in the group of formula 5 below.

[0033]

[Chemical 5]

R ₁ , R ₂ and R ₃ are hydrocarbon groups having 4 or more carbon atoms, R ₄ is CH ₃ and H, and R ₅ is 1 to 1 carbon atoms.
20 alkyl groups. N is 1 to 20, p, q,
And r are 1 or more, and L is 4 or more. A ⁻ : As the anion, Cl ⁻ , Br ⁻ , CH ₃ SO ₄ ⁻ , C ₂ H ₅ S
O ₄ ^-, and the like. The conductive layer (B) or the organic protective film (A) containing such an organic antistatic agent has a film thickness of 0.1 to 10.
50 μm, preferably about 0.3 to 10 μm. Further, the addition amount of the π-conjugated polymer and the charge transfer complex is preferably in the range of 1 to 40% by weight with respect to the total amount, and the addition amount of the surfactant-based antistatic agent is 0.1 to 0.1%. 10
%, Preferably 0.5 to 5% by weight.

The surface-treated substrate according to the present invention can be used for a part or the whole of an optical recording medium as described above. For example, when processing an optical disc, a hard coat is formed on a resin substrate such as glass or polycarbonate, a recording layer is formed, overcoating is performed on the recording surface side, and then this processing is performed. The surface to be treated is mainly on the pickup side (on the hard coat) or on the overcoat, but the entire surface may be treated. Further, when the cartridge is used by inserting it into a cartridge or the like, the main processing may be performed on the cartridge.

[0036]

EXAMPLES Preferred examples of the surface-treated substrate and the optical recording medium according to the present invention will be described below. The present invention is not limited to the following examples. (Example 1) A coating layer based on the treatments A to F was formed on the following substrate 1 to prepare samples of each example, and the surface contact angle test and the ash adhesion test were evaluated. The control is the untreated substrate 1. The results are shown in Table 1.

[Substrate] Substrate 1: Pentaerythritol triacrylate 100
A mixture (resin 1) of 10 parts by weight, 50 parts by weight of hydroxy acrylate, and 9 parts by weight of a photopolymerization initiator Irg.500 (manufactured by Ciba-Geigy) is used as a polycarbonate substrate (10 cm × 10).
cm x 1 mmt) to a cured film thickness of about 5 μm, and then irradiate with ultraviolet rays (high pressure mercury type; 650 mW / cm ² ; 1
It was cured by 800 mJ / cm ² ) to form an organic protective film (substrate 1).

[Treatment] Treatment A: 2- (perfluorooctyl) ethyl acrylate on the substrate
(2-perfluorooctylethyl acetate: R-1820 manufactured by Daikin Fine Chemical Co., Ltd.) was coated with a 5 wt% solution (solvent: PF5080 manufactured by 3M) (solution A), and was irradiated with ultraviolet rays under a nitrogen stream (high pressure mercury type; 650 mW / cm ^2). 180
0 mJ / cm ² ) and then washed with a fluorine solvent (PF5080), ethanol and water, and dried.

Treatment B: 2- (perfluorooctyl) et of Treatment A
(perfluorooctyl) ethylene instead of hyl acrylate
(Perfluorooctylethylene: R-1820 manufactured by Daikin Fine Chemicals) 8 wt% solution (solvent: PF508 manufactured by 3M)
0) (Solution B) and UV irradiation under nitrogen stream (high pressure mercury type; 650 mW / cm ² ; 1800 mJ / c)
m ² ) and then washed with a fluorine solvent (PF5080), ethanol and water, and dried.

Treatment C: 3-perfluorooctyl-1, on the substrate
2-epoxypropane (3-perfluorooctyl-1,2-
Epoxy propane: E-1 manufactured by Daikin Fine Chemical
830) 8 wt% solution (solvent: PF5080 manufactured by 3M) (solution C) is coated and heated in an oven at 80 ° C. for 1 hour, and then washed with a fluorine solvent (PF5080), ethanol and water,
Dried.

Treatment D: A substrate was coated with a 5 wt% ethanol solution (solution D) of a reactive silicone oil having a methacryloyl group at one end (X-2-174D manufactured by Shin-Etsu Chemical Co., Ltd.), and nitrogen was applied. UV irradiation (high pressure mercury type; 650 mW / cm ² ; 1800 mJ / cm ² ) under air flow,
Then, it was washed with ethanol and water and dried.

Treatment E: The substrate had vinyl groups at both ends
Reactive silicone oil (TS manufactured by Toshiba Silicone Co., Ltd.)
L9686) 5 wt% ethanol solution (solution E)
UV irradiation under a nitrogen stream (high pressure mercury type; 65
0 mW / cm²1800mJ / cm ²) And then Ethan
Washed with water and dried.

Treatment F: Reactive silicone oil having epoxy group at one end on the substrate (X-manufactured by Shin-Etsu Chemical Co., Ltd.)
22-173D) 8 wt% ethanol solution (solution F), heated in an oven at 80 ° C. for 1 hour, and then washed with a fluorine solvent (PF5080), ethanol and water,
Dried.

[Evaluation Method] Contact angle (water): 24 ° C., 50% RH, constant temperature, constant humidity 24
After standing for more than an hour, 0.1 μl of ion-exchanged water was dropped on the substrate and measured. Dirt test: The substrate was immersed in orange juice, pulled up, left at 80 ° C. for 7 days, then washed with water and rinsed with ethanol. ◯: No stain marks left at all Δ: Stain marks remained ×: Stain marks clearly visible

Tobacco ash adhesion test (evaluation of antistatic property);
In the environment of 23 ° C. and 30% RH, the surface was polished with a cloth and brought close to tobacco ash. ○: No ash adhered at all △: A little ash adhered ×: Remarkable ash adhered

[0046]

[Table 1] In addition, even when these results were repeatedly evaluated, similar results were obtained.

(Example 2) Example 1 was applied to the following substrates 2 to 6.
A coating layer based on the same treatment A as in 1 above was formed to prepare each practical sample, and the surface contact angle test and the ash adhesion test were evaluated in the same manner as in Example 1. The control is untreated substrate 1
Is. The results are shown in Table 2.

[Substrate] Substrate 2: Pentaerythritol triacrylate 100
Parts by weight, 50 parts by weight of hydroxy acrylate, photopolymerization opening
Initiator Irg.500 (manufactured by Nippon Ciba Geigy) 9 parts by weight
Compound (resin 1) cured on polycarbonate substrate
It is coated to a thickness of 5 μm and exposed to ultraviolet light (high pressure mercury
IP; 650mW / cm²1800mJ / cm ²) Cured by
On the organic protective layer₂O₃Sn₂Molar ratio of 9:
Using the target of No. 1, by the sputtering method
An ITO film was formed with a film thickness of 50 A (base 2).

Substrate 3: 25% by weight of a conductive filler (tin oxide) and 20% by weight of ethanol was added to (resin 1) (resin 2), and a cured film thickness of about 5 μm was formed on a polycarbonate substrate by spin coating. Coating, UV irradiation (high pressure mercury type; 650 mW / cm ² ; 1800 mJ
/ Cm ² ) (substrate 3).

Substrate 4: A polyaniline solution manufactured by Nippon Carlit Co., Ltd. was spin-coated (4000 rpm, 20 seconds) on the organic protective film of the substrate 1 used in Example 1, and then 80
It was heated at 0 ° C. for 30 minutes (base 4).

Substrate 5: Substrate 1 used in Example 1 was exposed to SO ₃ HCl gas for about 5 minutes in a desiccator, followed by pyrrole (Py) 0.02M, FeCl ₃ 0.03M, paratoluenesulfonic acid (PTS). ) Immersion in a 0.01 M aqueous solution at room temperature for 5 minutes, followed by washing with water, washing with ethanol, and drying (60 ° C, 10
Then, a conductive base (base 5) was obtained.

Substrate 6: 100 parts by weight of trimethylolpropane triacrylate, 50 parts by weight of polyethylene glycol diacrylate (A-600 manufactured by Shin-Nakamura Chemical Co., Ltd.), quaternary salt type antistatic agent Q-D308ESN (Kao Corporation) )) 1.5 parts by weight of mixture 3 of 9 parts by weight of Irg.500 is cured on a polycarbonate substrate to a film thickness of about 5 μm.
It was coated to a thickness of m and was cured by irradiation with ultraviolet rays (high pressure mercury type; 650 mW / cm ² ; 1800 mJ / cm ² ) (substrate 6).

[0053]

[Table 2] Moreover, even when these results were repeatedly evaluated, similar results were obtained.

(Example 3) Application to magneto-optical disk (1) After forming a recording layer (4 layers) on a polycarbonate for 3.5 inch magneto-optical disk manufactured by Idemitsu Petrochemical Co., Ltd., Dainippon Ink and Chemicals SD301 manufactured by Co., Ltd. was overcoated to form a film having a thickness of about 8 μm, and then 100 parts by weight of pentaerythritol triacrylate, 50 parts by weight of hydroxy acrylate, and a photopolymerization initiator Irg.500 (manufactured by Ciba-Geigy Japan) on the pickup side 9 Part by weight of the mixture (resin 1) was coated to a cured film thickness of about 5 μm, and cured by ultraviolet irradiation (high pressure mercury type; 650 mW / cm ² ; 1800 mJ / cm ² ) to form an organic protective layer (disk. Comparative example).

Next, SO₃Expose to HCl gas for about 1 minute, then
Pyrrole (Py) 0.02M, FeCl ₃0.03M
Ratoluenesulfonic acid (PTS) 0.01M aqueous solution at room temperature
Soak for 3 minutes, then wash with water, ethanol, and dry
(60 ° C., 10 minutes). Then, 2- (per
fluorooctyl) ethyl acrylate (Daikin Fine Chemica
5% by weight solution of R-1820 manufactured by Le (solvent: PF5080 manufactured by 3M)
(Solution A) is coated and UV irradiation (high pressure
Mercury type; 650mW / cm²1800mJ / cm²),
After that, wash with fluorine solvent (PF5080), ethanol, water
And dried (disk example).

In the disc example and the disc comparative example, no significant change was observed in various characteristics such as C / N and sensitivity before and after this treatment. In addition, a disk example and a disk comparative example were 23 ° C. 15% RH and 23 ° C.
A dirt chamber test (ASTM D2741-68; dust toner 10 μm) was performed in 0% RH to measure the error rate. Also, as a dirt test for both discs, after soaking in orange juice, leave them at 80 ° C for 7 days, then wash with water,
It was washed with ethanol and the error rate was measured. The results are shown in Table 3.

[0057]

[Table 3]

(Example 4) Application to magneto-optical disk (2) After forming a recording layer (4 layers) on a polycarbonate for 3.5-inch magneto-optical disk manufactured by Idemitsu Petrochemical Co., Ltd., Dainippon Ink and Chemicals SD301 manufactured by Co., Ltd. was overcoated to form a film having a thickness of about 8 μm. Then, the pickup 2 was coated with 5 μm of the resin 2 used in the treatment of the substrate 3 so that the cured film had a thickness of about 5 μm, and was irradiated with ultraviolet rays ( High pressure mercury type; 6
50 mW / cm ² ; 1800 mJ / cm ² ) for curing to form an organic protective layer.

Next, the solution D used for the treatment D was treated with the main sample.
Immerse the disc for 30 seconds and immediately pull it up on both sides with UV
Ray irradiation (high pressure mercury type; 650 mW / cm)²1800mJ
/cm ²), Washed with water and ethanol, and washed with Example 4
Got it. Example 4 The disc is used for curing the surface to prevent stains.
In addition, the lubrication performance of the recording layer side is also included,
The friction coefficient was measured using a Sony MD magnetic head.
However, it showed a value of 0.2 to 0.3 over a long period of time.

[0060]

With the surface-treated substrate according to the present invention, the treatment for making the surface conductive and lowering the surface energy is effectively performed.
It is possible to prevent not only stains caused by electrification but also water-soluble adhesive substances, oily adhesive substances, or stains caused by adhesion of dust particles due to liquid crosslinking force in a high humidity environment.

Claims (9)

[Claims] 1. A functional group (H) having at least one of water-repellent and oil-repellent functions on the surface of a substrate (S) or the surface of an organic protective film (A) formed on the substrate. And a surface-treated substrate for an optical material, which is coated with a compound containing a reactive group (R) in the molecule to form a coating layer (C) obtained by irradiation with a reactive energy ray. 2. The surface-treated substrate according to claim 1, wherein the reactive group (R) is a (meth) acryloyl group, a vinyl group or an epoxy group, and the functional group (H) is a fluorocarbon chain. 3. The surface-treated substrate according to claim 1, wherein the reactive group (R) is a (meth) acryloyl group or a vinyl group, and the functional group (H) is a silicone chain. 4. The conductive layer (B) is formed between the surface of the substrate (S) or the surface of the organic protective film (A) and the coating layer (C). Surface-treated substrate. 5. The film thickness of 0.1, wherein the conductive layer (B) contains at least one of a conductive filler and an organic antistatic agent.
The surface-treated substrate according to claim 4, which is a transparent conductive film having a thickness of ˜50 μm. 6. The surface-treated substrate according to claim 4, wherein the conductive layer (B) is made of a π-conjugated conductive material. 7. The surface-treated substrate according to claim 4, wherein the conductive layer (B) is an inorganic conductive film. 8. The organic protective film (A) is at least one polymer selected from a (meth) acrylate group having two or more (meth) acryloyl groups and a (meth) acrylate group having a hydrophilic group. The surface-treated substrate according to claim 1, which is coated and has a pencil hardness of H or more. 9. An optical recording medium, comprising a substrate on which a recording layer and a protective layer are sequentially formed, for optical reproduction and recording / reproduction, and the surface-treated substrate according to claim 1. An optical recording medium having a structure as a whole or a part thereof and having a surface having a low surface energy.