WO2004008449A1 - 光学記録媒体、これに使用される光透過性保護シートおよびそれらの製造方法 - Google Patents
光学記録媒体、これに使用される光透過性保護シートおよびそれらの製造方法 Download PDFInfo
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- WO2004008449A1 WO2004008449A1 PCT/JP2003/008772 JP0308772W WO2004008449A1 WO 2004008449 A1 WO2004008449 A1 WO 2004008449A1 JP 0308772 W JP0308772 W JP 0308772W WO 2004008449 A1 WO2004008449 A1 WO 2004008449A1
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- Prior art keywords
- light
- optical recording
- transmitting protective
- protective sheet
- layer
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/266—Sputtering or spin-coating layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/24018—Laminated discs
- G11B7/24024—Adhesion or bonding, e.g. specific adhesive layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/256—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers improving adhesion between layers
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24056—Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray® discs
Definitions
- the present invention relates to an optical recording medium having an optical recording layer for optically recording information, a light-transmitting protective sheet used for the optical recording medium, and a method for producing the same.
- optical information recording system has many advantages, such as non-contact recording and reproduction, compatibility with playback-only, write-once, and rewritable memory types.
- Increasing the capacity of optical recording media for various optical information recording systems is mainly achieved by shortening the wavelength of the laser used as the light source for the optical information recording system, and by adopting a lens with an aperture ratio. This has been achieved by reducing the spot size at the focal plane.
- the wavelength of a laser is 780 nm, and the numerical aperture (NA) of the lens is about 0.45.
- a digital versatile disc (DVD) achieves approximately seven times the capacity of a CD by setting the laser wavelength to 65 nm and the NA to about 0.6.
- the next-generation optical recording media currently proposed include an optical recording layer formed on a surface of a disk substrate having a thickness of about 1.1 mm, and a light-transmitting protective layer having a thickness of, for example, about 0.1 mm. (Cover layer), and by increasing the laser wavelength to 405 nm and the NA to about 0.85, the capacity of the DVD is increased by about 5 times.
- the next-generation optical recording medium includes, for example, a disk substrate made of polycarbonate resin, cyclic olefin resin and the like having a thickness of about 1.1 mm.
- Optical recording layer consisting of reflective films such as aluminum, silver, and gold, and phase-change organic or inorganic thin films (phase-change thin films)
- a light-transmitting protective layer having a thickness of about 0.1 mm is provided on the optical recording layer.
- the light transmitting protective layer has a very small thickness accuracy (specifically, In general, it is required to be ⁇ 2% or less, and preferably ⁇ 1% or less.
- an uncured liquid UV-curable resin is spin-coated on the optical recording layer of the optical recording medium, and the UV-curable resin is cured by irradiating ultraviolet light in a nitrogen atmosphere.
- a method has been proposed. When a light-transmitting protective layer having a thickness of about 0.1 mm is formed by this method, a difference in film thickness occurs between the central portion and the outer peripheral portion. It was difficult to obtain a protective layer.
- thermoplastic resin is formed into a sheet shape in advance to form a light-transmitting protective sheet, which is bonded to an optical recording layer.
- this light-transmitting protective sheet is manufactured by the extrusion method or the calendar method, the dimensional accuracy in the thickness direction is usually about ⁇ 5%, and even when using expensive precision equipment, it is about ⁇ 3%. However, it was difficult to achieve the target of about ⁇ 2% or less, preferably about ⁇ 1% or less. In addition, since the light-transmitting protective sheet is manufactured while being pulled in the winding direction, the birefringence of the light-transmitting protective sheet is increased.
- thermoplastic resin is dissolved in a solvent, and this is flowed over a flat mold, substrate, belt, or other surface, and the solvent is evaporated to form a sheet.
- a casting method (casting method) has been proposed (see Japanese Patent Application Laid-Open No. 2001-435566 and Japanese Patent Application Laid-Open No. 2002-74749).
- a light-transmitting protective sheet satisfying the thickness accuracy and the birefringence can be manufactured.
- solvent recovery at the time of manufacturing an influence of a residual solvent of the manufactured film on a disk, and
- bubbles were generated in the sheet due to the solvent.
- the presence of bubbles in the light-transmitting protective sheet causes a problem that the light transmittance is reduced.
- productivity is inferior and production costs are extremely high. There was a problem. Disclosure of the invention
- an object of the present invention is to provide a light-transmitting protective sheet having excellent optical properties such as thickness accuracy, birefringence, and light transmittance, having no residual solvent, an optical recording medium having excellent optical properties and capable of increasing the capacity, Another object of the present invention is to provide a production method capable of producing them at low cost and with good productivity.
- the optical recording medium of the present invention includes a substrate, an optical recording layer formed on at least one surface of the substrate, an adhesive layer provided on the optical recording layer, and a light provided on the adhesive layer. Having a light-transmitting protective layer, wherein the light-transmitting protective layer is formed by bonding a light-transmitting protective sheet obtained by curing a radiation-curable coating material into a sheet to an optical recording layer via an adhesive layer. Characterized in that it is a layer formed.
- the adhesive layer is a layer made of a transparent acrylic resin adhesive or a radiation-curable resin adhesive.
- the light-transmitting protective sheet has a primer layer on the side of the adhesive layer.
- the primer layer is desirably a dry coating film of a solvent type paint containing a polymerizable oligomer and / or an acrylic polyol-based resin.
- the radiation-curable paint preferably contains a polymerizable oligomer and a polymerizable monomer.
- the method for producing an optical recording medium of the present invention comprises: an optical recording layer forming step of forming an optical recording layer on at least one surface of a substrate; an adhesive supplying step of supplying an adhesive on the optical recording layer; And a laminating step of laminating a light-transmitting protective sheet obtained by curing the coating material in a sheet shape on an adhesive and laminating the optical recording medium on an optical recording layer.
- the optical recording layer forming step of forming an optical recording layer on at least one side of a substrate, and a light-transmitting protective sheet obtained by curing a radiation-curable coating material in a sheet shape are bonded to the optical recording layer via a double-sided adhesive sheet. And a laminating step.
- the light-transmitting protective sheet of the present invention is characterized in that a radiation-curable paint is cured into a sheet.
- the light-transmitting protective sheet of the present invention has, on one surface, a single layer of a dried film of a solvent type paint containing a polymerizable oligomer and a Z or acrylic polyol-based resin.
- the method for producing a light-transmitting protective sheet of the present invention includes a coating film forming step of applying a radiation-curable coating material to a surface of a release substrate to form a coating film, and irradiating the coating film with radiation. And a peeling step of peeling the light-transmissive protective sheet from the release substrate.
- the method for producing a light-transmitting protective sheet of the present invention comprises: applying a solvent-type paint containing a polymerizable oligomer and a resin or an acrylic polyol-based resin to the surface of a release substrate; drying the paint film; A primer layer forming step of forming a layer; a coating forming step of applying a radiation-curing coating on one of the primers to form a coating; and irradiating the coating with radiation to cure the coating and transmit light.
- the light-transmitting protective sheet of the present invention comprises a curing step of forming a light-transmitting protective sheet, and a peeling step of peeling the light-transmitting protective sheet from the release substrate. Excellent optical properties such as transmittance and no residual solvent.
- the optical recording medium of the present invention using the light transmitting '14 protective sheet has excellent optical characteristics and can have a large capacity. Further, according to the method for manufacturing a light-transmitting protective sheet of the present invention, the light-transmitting protective sheet of the present invention can be manufactured at low cost and high productivity. Further, according to the method for producing an optical recording medium of the present invention of the present invention, the optical recording medium of the present invention can be produced at low cost and with good productivity.
- the optical recording medium of the present invention comprises: a substrate; an optical recording layer formed on at least one surface of the substrate; an adhesive layer provided on the optical recording layer; and a light transmitting protection provided on the adhesive layer. And a layer.
- the substrate include a disk substrate made of a polycarbonate resin, a cyclic olefin resin, an acrylic resin, or the like.
- the thickness of the substrate is not particularly limited, but is usually about 1.0 to 1.1 mm.
- the substrate is formed with an uneven surface of the group portion and the land portion at a predetermined track pitch.
- the track pitch is not particularly limited, but is usually 0.32 ⁇ .
- the optical recording layer is a layer formed on the uneven surface of the substrate.
- the optical recording layer is composed of a reflective film made of aluminum, silver, gold, or the like, or a phase change organic or inorganic thin film (phase change thin film). It also has a dielectric protection film.
- the optical recording layer may be formed on both sides of the substrate, and in that case, the light-transmitting protective layer is also formed so as to cover both sides.
- the adhesive layer is for bonding the light-transmitting protective sheet to the optical recording layer.
- the adhesive layer is preferably a layer made of a transparent acrylic resin adhesive or a radiation-curable resin adhesive in terms of light transmittance, long-term stability, and low discoloration.
- the transparent acrylic resin pressure-sensitive adhesive is usually used in the form of a double-sided pressure-sensitive adhesive sheet or a double-sided pressure-sensitive adhesive tape.
- An example of such a transparent acrylic resin adhesive is a transparent double-sided tape for fixing an optical film “CS_9611” made by Nitto Denko Edo.
- Examples of the radiation-curable resin adhesive include an ultraviolet-curable resin-based adhesive and an electron beam-curable resin-based adhesive.
- Examples of the ultraviolet curable resin and the electron beam curable resin include a radiation curable resin containing a polymerizable oligomer and a polymerizable monomer described below.
- Radiation-curable resin adhesives have a low viscosity to spread evenly and thinly on the substrate.
- the viscosity before curing measured by a B-type viscometer should be 50 to 30 OmPa * s. It is good.
- the radiation-curable resin adhesive preferably has a hardness after curing of not more than H in pencil hardness (JISK540). By using such a radiation-curable resin adhesive, it is possible to reduce the warpage and distortion of the light-transmitting protective sheet due to the curing shrinkage of the adhesive.
- the light-transmitting protective layer is a layer formed by bonding the light-transmitting protective sheet of the present invention to an optical recording layer via an adhesive layer.
- the thickness of the light-transmitting protective layer is not particularly limited, but is usually about 100 ⁇ m including the adhesive layer.
- the light-transmitting protective sheet of the present invention is obtained by curing a radiation-curable coating material into a sheet.
- radiation in the present invention means ultraviolet rays or electron beams.
- those containing a polymerizable oligomer and a polymerizable monomer are preferable from the viewpoint of ensuring the thickness accuracy at the time of coating and forming a film.
- polymerizable oligomer examples include urethane acrylate oligomers, polyester acrylate oligomers, epoxy acrylate copolymers, acryl resin acrylate acrylate-based oligoaryl ether-based oligovinyl ether-based oligoaryl urethane-based oligomers, and the like.
- urethane acrylate oligomers comprising a high molecular weight isocyanate and an acrylate having a hydroxyl group are preferable because of their low curing shrinkage.
- the high molecular weight isocyanate examples include aromatic isocyanates such as tolylene diisocyanate and xylene diisocyanate; aliphatic and alicyclic isocyanates such as hexamethylene diisocyanate, isophorone diisocyanate and hydrogenated xylene diisocyanate. Is mentioned.
- the acrylate having a hydroxy group examples include 2-hydroxyl acrylate, 2-hydroxypropyl acrylate, and pentaerythritol acrylate.
- the mass average molecular weight of the urethane acrylate polymer is preferably about 4,700,000.
- Acrylic resin acrylate is an acrylic copolymer resin containing polymethyl methacrylate as a main component and (meth) acrylate monomer having a functional group such as a carboxyl group, an epoxy group or a hydroxy group in advance. Double bonds are introduced by copolymerization and an addition reaction with an atalylate monomer having a functional group that undergoes an addition reaction corresponding to each functional group.
- polymerizable monomer examples include monofunctional acrylates such as hexyl acrylate, 2-ethylhexyl acrylate, isobornyl acrylate, and isooctyl acrylate; 1,6-hexanediol diacrylate; Bifunctional acrylates such as pentyl glycol diacrylate; polyfunctional acrylates such as trimethylolpropane triatalylate and dipentaerythritol hexane acrylate;
- the radiation-curable paint is an ultraviolet-curable paint that is cured by ultraviolet rays
- a photopolymerization initiator and the like are included. If the radiation-curable coating is an electron-curing coating that is cured by an electron beam, no photopolymerization initiator is required.
- the radiation-curable paint is preferably a solventless radiation-curable paint in that the problem of residual solvent does not occur.
- the radiation-curable paint may contain a small amount of solvent without causing a problem of residual solvent.
- the radiation-curable paint examples include Daicel UCB's “KRM78”, a solvent-free radiation-curable paint containing an aliphatic urethane acrylate polymer using aliphatic isocyanate and a polymerizable monomer. Showa Ink Kogyo Co., Ltd. is a solvent-free radiation-curing paint containing 18 "," KRM7842 “,” KRM7946 "; bifunctional urethane acrylate oligomer and polyfunctional acrylate. "C ⁇ 2 ⁇ Clear 1", “CTO 2a G Clear 1" and the like.
- the light-transmitting protective sheet of the present invention preferably has a primer layer on one side (adhesive layer side) in order to improve the adhesiveness with the adhesive layer.
- a primer layer a dried coating film of a solvent-type paint containing a polymerizable oligomer and / or an acrylic polyol-based resin is preferable from the viewpoint of adhesion to a radiation-curable paint.
- solvent-based paint containing a polymerizable oligomer examples include a radiation-curable resin containing an acrylic oligomer, and a preferred specific example thereof is “CSEB 5 Medium” (urethane acrylate oligomer) manufactured by Showa Ink & Co., Ltd. , “CSEB12 Medium J (acrylic resin acrylate copolymer).
- Specific examples of solvent-based paints containing ataryl polyol resin include Showa In “MK A media”, “CSEB 2 media”, and “CSEB 10 media J” manufactured by Ku Kogyosho.
- solvent-based paints may be used alone, or may be used as a mixture of a solvent-based paint containing a polymerizable oligomer and a solvent-based paint containing an acrylacrylic-based resin.
- the thickness of the light-transmitting protective sheet of the present invention is not particularly limited, but is usually about 1 ⁇ m ⁇ together with the adhesive layer when the optically-transparent protective sheet is bonded to the optical recording layer via the adhesive layer. Is set to A light transmitting protective sheet for an optical recording medium is required to have a high degree of thickness accuracy.
- the thickness accuracy of the light transmitting protective sheet for an optical recording medium is preferably ⁇ 2% or less, more preferably ⁇ 1% or less.
- the birefringence of the light transmitting protective sheet of the present invention is preferably as small as possible from the viewpoint of high reliability of input / output signal information. Specifically, the birefringence of the light transmitting protective sheet of the present invention is preferably 10 nm or less, more preferably 2 nm or less.
- the hardness of the light-transmitting protective sheet of the present invention is preferably B or more in terms of pencil hardness (JISK540) from the viewpoint of preventing scratches and contamination during use.
- the light transmitting / protecting sheet of the present invention is manufactured, for example, as follows. First, a radiation-curing paint is continuously applied to the surface of an endless belt-shaped release substrate moving in a certain direction to form a coating film (coating film forming step). Then, the coating film is irradiated with radiation to cure the coating film (curing step). After the coating film is cured, the cured coating film is peeled off from the release substrate and wound up to obtain a light-transmitting protective sheet continuously (peeling step).
- the light-transmitting protective sheet has a primer layer, it is produced, for example, as follows.
- a solvent-type paint containing a polymerizable oligomer and z or an acrylic polyol-based resin is applied continuously to the surface of an endless belt-shaped release substrate that moves in a certain direction, and the coat is dried to form a primer layer.
- a radiation-curable paint is continuously applied on the primer layer to form a coating film (coating film forming step).
- the coating film is irradiated with radiation to cure the coating film (hardening step).
- the cured coating is peeled off from the release substrate and wound up. Obtain a light-transmitting protective sheet (peeling step).
- a release film such as a polyethylene terephthalate (PET) film, a stainless steel belt, or the like can be used.
- a die coating method As a method for applying the coating material to the release substrate, a die coating method, a knife coating method, a dara via coating method, or the like can be employed. Among them, the die coating method is preferable in that the obtained light transmitting protective sheet has good dimensional accuracy.
- the die coater used in this die coating method is “Ultra-precision coating die coater” manufactured by Toshiba Machine Co., “Slot die coater” manufactured by Yasui Seiki, “Slit die coater” manufactured by Toray Engineering, and “Die coater” manufactured by Musashinokikai. And the like.
- electron beam curing is preferable.
- an additive such as a photopolymerization initiator
- productivity can be improved because of the maximum energy of the electron beam.
- a ring-shaped substrate is formed by injection molding.
- An optical recording layer is formed by depositing a reflective film of aluminum, silver, gold, or the like, or an organic or inorganic phase change thin film on the uneven surface of the substrate by a sputtering method or the like (optical recording layer forming step).
- a radiation-curable resin-based adhesive is supplied onto the optical recording layer (adhesive supply step).
- the light-transmitting protective sheet of the present invention cut in a ring shape is overlaid on an adhesive, and the adhesive is spread between the light-transmitting protective sheet and the optical recording layer.
- the adhesive is cured by irradiation with radiation to form an adhesive layer, and an optical recording medium in which the light-transmitting protective sheet and the optical recording layer are bonded is obtained (laminating step).
- the optical recording medium is manufactured as follows.
- a double-sided pressure-sensitive adhesive sheet made of a transparent acrylic resin pressure-sensitive adhesive is disposed on the optical recording layer.
- the light-transmitting protective sheet of the present invention is arranged and bonded to the optical recording layer via the double-sided pressure-sensitive adhesive sheet (laminating step). Or on at least one side of the substrate After forming the optical recording layer (optical recording layer forming step), the light-transmitting protective sheet of the present invention, on which a double-sided pressure-sensitive adhesive tape made of a transparent acrylic resin pressure-sensitive adhesive is laminated, is disposed on the optical recording layer, Adhere to the optical recording layer via a double-sided adhesive tape (pasting step).
- the light-transmitting protective sheet of the present invention described above is obtained by curing a radiation-curable coating material in the form of a sheet, and thus is manufactured by a coating method obtained by spin coating, an extrusion method, or a force-rendering method.
- the thickness accuracy is better and the birefringence is smaller than that of a sheet that has been thinned.
- it since it is a light-transmitting protective sheet made of a radiation-curable paint, it also has problems with residual solvents and bubbles compared to conventional light-transmitting protective sheets made from a thermoplastic resin containing a large amount of solvent by a casting method. And excellent in transparency and dimensional stability.
- the light-transmitting 14 protective layer is a layer in which the light-transmitting protective sheet of the present invention is bonded to the optical recording layer via an adhesive layer. Excellent characteristics and large capacity is possible. Also, there is no effect on the optical recording layer by the residual solvent.
- Such an optical recording medium is suitable for an optical recording medium of a system in which a group of optical recording layers is irradiated with a blue-violet laser having a laser wavelength of 405 nm through a light-transmitting protective film to read reflected light.
- An aperture ratio can be achieved.
- the radiation-curable coating film applied to the surface of the release substrate is cured by irradiation with radiation to form a light-transmitting protective sheet. Therefore, compared with the conventional casting method using a thermoplastic resin containing a large amount of a solvent, a light-transmitting protective sheet can be manufactured at low cost and with high productivity.
- the optical recording medium is manufactured at low cost because the light-transmitting protective sheet obtained by curing the radiation-curable coating material into a sheet is bonded to the optical recording layer. And can be manufactured with good productivity.
- the measurement was performed using a continuous film thickness measuring device “K306C” manufactured by Anritsu Corporation.
- the measurement sample used was one that was cut into 5 strips of 5 cm width at 5 points in the film length direction and 5 points in the film width direction at 5 points.
- the birefringence of the light-transmitting protective sheet was measured using a Shin-Oji Paper Co., Ltd. optical birefringence analyzer “KOBRA-21 SDH” for long films.
- Solvent-free radiation-curable paint (KRM7818, a product of Daicel UCB, urethane acrylate) is applied to a smooth release film made of PET film by a die coating method, and then nitrogen is applied to the applied radiation-curable paint.
- An electron beam was irradiated in a gas atmosphere under the conditions of an absorbed dose of 7 Mrad and a passage speed of 50 m / min to cure the radiation-curing paint to produce a transparent light-transmitting protective sheet.
- the light-transmitting protective sheet separated from the release film had a thickness within a range of 95 / m ⁇ 0.9 im and a birefringence of 1.37 nm at a measurement wavelength of 590 nm.
- a polycarbonate substrate made of polycarbonate resin with a thickness of about 1.1 mm was manufactured by injection molding, and an optical recording layer consisting of an aluminum reflective film and a coating thin film of an organic dye was formed on the substrate by sputtering. .
- a liquid UV curable resin adhesive manufactured by Nagase ChemteX Corporation
- the light-transmitting protective sheet cut in a ring shape is overlaid thereon.
- the disc substrate is rotated at a high speed, and the adhesive is evenly spread between the light-transmitting protective sheet and the optical recording layer by centrifugal force to shake off the excess adhesive, and the adhesive is irradiated by ultraviolet rays.
- An optical recording medium was produced by curing to form an adhesive layer having a thickness of 5. ⁇ ⁇ .
- a primer of a solvent-type acrylol-based resin (“MKA Medium” manufactured by Showa Ink Industries, Ltd., solid content: 40% by mass) is applied to a release film made of a smooth PET film by a coater, dried and dried to a thickness of 2 im. Was formed.
- a non-solvent radiation-curing paint (“KRM7842", a product of Daicel UCB, urethane acrylate) based on a die coat method is applied on the primer layer.
- the radiation-cured paint was irradiated with an electron beam in a nitrogen gas atmosphere under the conditions of an absorbed dose of 7 Mrad and a passage speed of 5 OmZ to cure the radiation-cured paint to produce a transparent light-transmitting protective sheet.
- the light-transmitting protective sheet with a primer layer separated from the release film had a thickness in the range of 75 111 ⁇ 0.6 ⁇ and a birefringence of 1.30 nm at a measurement wavelength of 590 ⁇ m.
- a disk substrate made of polycarbonate resin with a thickness of about 1.1 mm is manufactured by injection molding, and an optical recording film consisting of an aluminum reflective film, an alloy-based phase change thin film, and a dielectric protection film is formed on the substrate by sputtering. A layer was formed.
- the light-transmitting protective sheet with the primer layer was placed on the optical recording layer of the disk substrate via a double-sided adhesive sheet (manufactured by Nitto Denko Corporation) using a transparent acrylic resin adhesive with a thickness of 25 ⁇ .
- the substrates were cut into a ring shape, and the primer layers were overlapped with the optical recording layer as the primer layer side. In this state, a light-transmitting protective sheet was bonded to the optical recording layer via a double-sided pressure-sensitive adhesive sheet to produce an optical recording medium.
- a solvent-type acrylic polyol-based resin (“Medium” manufactured by Showa Ink Industries, solid content of 40% by mass) and a solvent-type urethane acrylate oligomer (Showa Ink Kogyo Co., Ltd.)
- a transparent light-transmitting protective sheet with a primer layer was produced in the same manner as in Example 2 except that primers obtained by mixing the same amounts of “CSEB 5 Medium” and a solid content of 40% by mass were used. did.
- the light-transmitting protective sheet with a primer layer separated from the release film had a thickness in the range of 75 ⁇ soil 0.6 ⁇ and a birefringence of 1.40 nm at a measurement wavelength of 590 nm.
- a solvent-type acrylic polyol-based resin (“MKA Medium” manufactured by Showa Ink Industries, solid content of 40% by mass) and a solvent-type acrylic resin acrylate-based oligomer (manufactured by Showa Ink Industries, Ltd.)
- a transparent light-transmitting protective sheet with a primer layer was produced in the same manner as in Example 2, except that primers obtained by mixing the same amounts of “CSEB 12 medium” and a solid content of 40% by mass) were used.
- the light-transmitting protective sheet with a primer layer separated from the release film had a thickness within the range of 75 m ⁇ 0.6 / zm, and the birefringence at a measurement wavelength of 59 Onm was 1.35 ⁇ m.
- a solvent-type acryl resin acrylate-based oligomer (“CSEB 12 Medium” manufactured by Showa Ink Industries, Ltd., solid content: 40% by mass) was used.
- a transparent light-transmitting protective sheet with a primer layer (thickness: 2 m) was produced in the same manner as in Example 2 except that KRM7846J (urethane acrylate) was used.
- the light-transmitting protective sheet with a layer had a thickness in the range of 95 / m ⁇ 1 ⁇ and a birefringence of 1.37 nm at a measurement wavelength of 590 nm. Thus, an optical recording medium was manufactured.
- Solvent-free radiation-curable paint (CT02H Clear-I, Showa Ink Kogyo Co., Ltd., 70% by mass of urethane acrylate copolymer, 30% by mass of polyfunctional acrylate polymer) is die-coated on a release film made of smooth PET film
- the radiation-cured paint is cured by applying an electron beam from above the applied radiation-cured paint in a nitrogen gas atmosphere under the conditions of an absorption dose of 7 Mrad and a passage speed of 50 m / min.
- a light-transmitting Tosei protection sheet was manufactured.
- the light-transmitting protective sheet separated from the release film had a thickness of 75 m ⁇ 0.4 ⁇ m, a birefringence of 1.0 nm at a measurement wavelength of 590 nm, and an H of pencil hardness (JISK 5400).
- a disk substrate made of polycarbonate resin with a thickness of about 1.1 mm is manufactured by injection molding, and an optical recording film consisting of an aluminum reflective film, an alloy-based phase change thin film, and a dielectric protection film is formed on the substrate by sputtering. A layer was formed.
- Dace The optically transparent protective sheet with the adhesive layer described above was peeled off from the other separator film on the double-sided tape and bonded to the optical recording layer on the optical recording layer on the optical recording layer under reduced pressure to obtain an optical recording medium.
- Example 6 As the solvent-free radiation-curable coating material of Example 6, “CT02a G Clear I” (manufactured by Shogaguchi Ink Industry Co., Ltd., urethane acrylate copolymer 80 mass 0 /., Polyfunctional acrylate polymer 20 mass%) was used. A transparent light-transmitting protective sheet was produced in the same manner as in Example 6 except that the protective sheet was used. The light-transmitting protective sheet separated from the release film had a thickness of 75 ⁇ ⁇ 0.4 ⁇ , a birefringence of 1. O nm at a measurement wavelength of 590 nm, and a pencil hardness (JISK 5400) of H.
- CTISK 5400 pencil hardness
- a coater of a solvent-type acrylol-polyol resin (“KA Medium 4b” manufactured by Showa Ink Industries, Ltd., solid content: 40% by mass) is applied with a coater, dried and thickened. A single layer of 2 / zm was formed. Next, radiation curable coating solventless on the primer layer (Showa Ink Kogyosho Co.
- a transparent double-sided tape for fixing optical film (Nitto Denko Corporation, “CS_9611”) with an adhesive layer thickness of 25 ⁇ was laminated on this light-transmitting protective sheet by peeling off the separator film on one side. The sheet was punched into a ring to obtain a light-transmitting protective sheet with an adhesive layer.
- a disk substrate made of polycarbonate resin with a thickness of about 1.1 mm was manufactured by injection molding, and an aluminum reflective film was formed on the substrate by sputtering.
- An optical recording layer consisting of an alloy-based phase change thin film and a dielectric protective film was formed.
- the above-mentioned light-transmitting protective sheet with an adhesive layer is peeled off from the other separator film of the double-sided tape and adhered under reduced pressure, and the optical recording medium is obtained. Obtained.
- solvent-based ⁇ acrylic polyol resin Showa I link Industries Ltd., "KA Mejiumu 4 b", solid content 40 mass 0/0
- solvent-based urethane ⁇ chestnut rate oligomer Showa A transparent light-transmitting protective sheet with a primer layer was produced in the same manner as in Example 8, except that primers in which the same amounts of “CSEB 5 Medium” manufactured by Ink Kogyosho Co., Ltd. and 40% by mass of solid content were mixed were used. did.
- the light-transmitting protective sheet separated from the release film has a thickness of 75 im ⁇ 0.6 m, a birefringence of 1.0 nm at a measurement wavelength of 590 nm, and a pencil hardness on the side where the radiation-curable paint is cured ( JISK 5400) was H.
- a transparent sheet made of polycarbonate resin with an average thickness of 95 m was prepared using the melt extrusion method.
- the thickness of this sheet was 95 ⁇ 4 / xm, and the birefringence was 140 nm.
- the optical recording medium of the present invention is suitable for a next-generation optical recording medium for reading reflected light by irradiating a group portion of the optical recording layer with a blue-violet laser having a wavelength of 405 nm through a light-transmitting protective film and reading reflected light.
- An aperture ratio can be achieved.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/520,448 US20060165941A1 (en) | 2002-07-10 | 2003-07-10 | Optical recording medium, light-transmitting protective sheet used for same, and method for manufacturing them |
JP2004521174A JP4050274B2 (ja) | 2002-07-10 | 2003-07-10 | 光学記録媒体、これに使用される光透過性保護シートおよびそれらの製造方法 |
EP03764159A EP1553575A1 (en) | 2002-07-10 | 2003-07-10 | Optical recording medium, light-transmitting protective sheet used for same, and method for manufacturing them |
AU2003252594A AU2003252594A1 (en) | 2002-07-10 | 2003-07-10 | Optical recording medium, light-transmitting protective sheet used for same, and method for manufacturing them |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-200850 | 2002-07-10 | ||
JP2002200850 | 2002-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004008449A1 true WO2004008449A1 (ja) | 2004-01-22 |
Family
ID=30112536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008772 WO2004008449A1 (ja) | 2002-07-10 | 2003-07-10 | 光学記録媒体、これに使用される光透過性保護シートおよびそれらの製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20060165941A1 (ja) |
EP (1) | EP1553575A1 (ja) |
JP (1) | JP4050274B2 (ja) |
AU (1) | AU2003252594A1 (ja) |
WO (1) | WO2004008449A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008044418A1 (fr) * | 2006-10-12 | 2008-04-17 | Lintec Corporation | support d'enregistrement optique et son procédé de fabrication |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004095095A (ja) * | 2002-09-02 | 2004-03-25 | Fuji Photo Film Co Ltd | 光情報記録媒体 |
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JPH03147834A (ja) * | 1989-11-06 | 1991-06-24 | Fuji Photo Film Co Ltd | 光ディスクの製造方法 |
JP2001043566A (ja) * | 1999-03-19 | 2001-02-16 | Tdk Corp | 光情報媒体およびその製造方法 |
JP2002011741A (ja) * | 2000-06-30 | 2002-01-15 | Mitsubishi Chemicals Corp | 透明樹脂基板の連続的製造方法 |
JP2002011739A (ja) * | 2000-06-30 | 2002-01-15 | Mitsubishi Chemicals Corp | 透明樹脂基板の連続的製造方法 |
JP2002074749A (ja) * | 2000-08-30 | 2002-03-15 | Sony Corp | 光学記録媒体およびその製造方法 |
JP2002092957A (ja) * | 2000-09-19 | 2002-03-29 | Mitsui Chemicals Inc | 光記録媒体用表面保護層材料 |
JP2002133731A (ja) * | 2000-10-24 | 2002-05-10 | Sony Corp | 光記録媒体の製造方法 |
JP2002163838A (ja) * | 2000-09-14 | 2002-06-07 | Tdk Corp | 光情報媒体 |
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JPS62185264A (ja) * | 1986-02-12 | 1987-08-13 | Fuji Photo Film Co Ltd | 情報記録媒体 |
GB9309024D0 (en) * | 1993-04-30 | 1993-06-16 | Ici Plc | Composite sheet |
JPH09180261A (ja) * | 1995-12-22 | 1997-07-11 | Pioneer Electron Corp | 貼合せ型光ディスク |
US6269072B1 (en) * | 1999-10-22 | 2001-07-31 | Victor Company Of Japan, Ltd. | Optical disc |
JP2002230834A (ja) * | 2000-06-26 | 2002-08-16 | Tdk Corp | 光情報媒体、その製造方法、その記録または再生方法、およびその検査方法 |
US20040042379A1 (en) * | 2000-10-24 | 2004-03-04 | Schoeppel Wolfgang G | Optical storage medium |
-
2003
- 2003-07-10 AU AU2003252594A patent/AU2003252594A1/en not_active Abandoned
- 2003-07-10 JP JP2004521174A patent/JP4050274B2/ja not_active Expired - Fee Related
- 2003-07-10 US US10/520,448 patent/US20060165941A1/en not_active Abandoned
- 2003-07-10 EP EP03764159A patent/EP1553575A1/en not_active Withdrawn
- 2003-07-10 WO PCT/JP2003/008772 patent/WO2004008449A1/ja not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03147834A (ja) * | 1989-11-06 | 1991-06-24 | Fuji Photo Film Co Ltd | 光ディスクの製造方法 |
JP2001043566A (ja) * | 1999-03-19 | 2001-02-16 | Tdk Corp | 光情報媒体およびその製造方法 |
JP2002011741A (ja) * | 2000-06-30 | 2002-01-15 | Mitsubishi Chemicals Corp | 透明樹脂基板の連続的製造方法 |
JP2002011739A (ja) * | 2000-06-30 | 2002-01-15 | Mitsubishi Chemicals Corp | 透明樹脂基板の連続的製造方法 |
JP2002074749A (ja) * | 2000-08-30 | 2002-03-15 | Sony Corp | 光学記録媒体およびその製造方法 |
JP2002163838A (ja) * | 2000-09-14 | 2002-06-07 | Tdk Corp | 光情報媒体 |
JP2002092957A (ja) * | 2000-09-19 | 2002-03-29 | Mitsui Chemicals Inc | 光記録媒体用表面保護層材料 |
JP2002133731A (ja) * | 2000-10-24 | 2002-05-10 | Sony Corp | 光記録媒体の製造方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008044418A1 (fr) * | 2006-10-12 | 2008-04-17 | Lintec Corporation | support d'enregistrement optique et son procédé de fabrication |
JP2008097716A (ja) * | 2006-10-12 | 2008-04-24 | Lintec Corp | 光記録媒体製造用シートおよび光記録媒体、ならびにそれらの製造方法 |
JP4570604B2 (ja) * | 2006-10-12 | 2010-10-27 | リンテック株式会社 | 光記録媒体製造用シートおよび光記録媒体、ならびにそれらの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US20060165941A1 (en) | 2006-07-27 |
EP1553575A1 (en) | 2005-07-13 |
AU2003252594A1 (en) | 2004-02-02 |
JPWO2004008449A1 (ja) | 2005-11-10 |
JP4050274B2 (ja) | 2008-02-20 |
AU2003252594A8 (en) | 2004-02-02 |
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