WO2005031729A1 - 光ディスク - Google Patents
光ディスク Download PDFInfo
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- WO2005031729A1 WO2005031729A1 PCT/JP2004/014556 JP2004014556W WO2005031729A1 WO 2005031729 A1 WO2005031729 A1 WO 2005031729A1 JP 2004014556 W JP2004014556 W JP 2004014556W WO 2005031729 A1 WO2005031729 A1 WO 2005031729A1
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- Prior art keywords
- group
- reflective film
- silver
- formula
- ultraviolet
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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
- G11B7/241—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
- G11B7/254—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 protective topcoat layers
- G11B7/2542—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 protective topcoat layers consisting essentially of organic resins
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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
- G11B7/258—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 reflective layers
- G11B7/259—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 reflective layers based on silver
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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
- G11B7/253—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 substrates
- G11B7/2533—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 substrates comprising resins
- G11B7/2534—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 substrates comprising resins polycarbonates [PC]
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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
- G11B7/258—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 reflective layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/21—Circular sheet or circular blank
Definitions
- the present invention relates to an optical disc having a reflective film of silver or an alloy containing silver as a main component.
- a typical example of the clamshell type optical disc is a DVD (digital versatile disc or digital video disc).
- This DVD is produced by a method in which at least two optical disc substrates each having an information recording layer formed on at least one optical disc substrate are bonded.
- an adhesive composed of an ultraviolet ray hardening type composition is generally used as a bonding agent used at that time.
- the information recording layer is a layer made of irregularities called pits, a phase change material or a dye formed on the base for an optical disk made of a synthetic resin such as polycarbonate, and a layer formed on the base for reading information. It is a laminate composed of a translucent reflective film for reflecting laser light or a completely reflective film.
- the translucent reflection film and the perfect reflection film are layers formed on the uppermost part of the information recording layer, and are generally made of a metal or metal alloy thin film.
- DVD-10 an optical disk
- ⁇ 1 of the pits For example, two polycarbonate substrates for an optical disk having an aluminum layer formed thereon are prepared as two layers, and they are bonded together with the aluminum layer as an adhesive surface.
- DVD-5" is obtained by laminating the substrate for manufacturing "DVD-10” and a normal O-transparent polycarbonate substrate having no information recording layer.
- the “DVD-9” is composed of a substrate in which a reflective film of aluminum is formed on pits provided on one side of the substrate.
- a substrate having a translucent reflective film made of gold or an alloy containing gold as a main component, silver or an alloy containing silver as a main component, or a silicon compound formed on pits provided on one side of the plate is used as a reflection film. It is bonded as an adhesive surface.
- DVD-18 is obtained by laminating two substrates having two information recording layers on one side. At present, DVD-9, which has a large recording capacity and can read two layers of information from one side, has become mainstream.
- Gold or silicon compounds are mainly used for the translucent reflective film of DVD-9 or the like.
- gold has the disadvantage that the material is very expensive and disadvantageous in terms of cost, and silicon compounds have the disadvantage that film formation is very difficult. Therefore, replacement with silver or an alloy containing silver as a main component is being actively studied because of its lower cost and easier film formation than gold.
- Patent Document 1 describes a test under high-temperature and high-humidity environment of 80 ° C, 85% RH, 500 hours even for DVD-9 using silver or an alloy mainly composed of silver as a translucent reflective film. After performing the test, there is no discoloration or pinhole generation of the translucent reflective film, and the durability is equivalent to that of DVD-9 using gold as the translucent reflective film.
- an adhesive composition containing a cationically polymerizable compound, a light-induced thione polymerization initiator, and a hydroxycarboxylic acid as an aluminum corrosion inhibitor is applied to a thin film such as a vapor-deposited aluminum film.
- a coating technique has been reported (for example, refer to claims, JP-A-2002-1464631, the sixth paragraph, and the 25th paragraph. Reference 2).
- hydroxycarboxylic acids include citric acid, isocunic acid, tartaric acid, malic acid, lactic acid, 2-methyl lactic acid, hydroxypyruvic acid, dimethylolbutanoic acid, dimethylolpropionic acid, ⁇ -hydroxyisobutyric acid, and ⁇ -diphene.
- -Glycolic acid mandelic acid, 6-hydroxy-2-naphthoic acid, p-hydroxybenzoic acid, 5-hydroxyisophthalic acid, p-hydroxyphenylacetic acid, p-hydroxyphenylpropionic acid, citrazinic acid , Kelidamic acid, gallic acid and the like.
- the adhesion of the ultraviolet-curable composition used as an adhesive to the metal reflective film is also an important issue.
- a technique for solving this for example, a technique relating to a composition having excellent adhesion to both an amorphous silicon luster substrate and a metal reflecting film such as gold, silver, copper, or aluminum has been reported (for example, See, for example, the claims of Japanese Patent Application Laid-Open No. 2002-285502, paragraphs 28, 29, and 34. Hereinafter, this is referred to as Patent Document 3.) .
- an ultraviolet ray curable fiber composition for an optical disk containing a dicyclopentadiene diatalylate, a thioxanthone compound, and a (meth) atalylate having a phosphate group.
- a polymerization inhibitor for example, nodroquinone monomethinoleate, t-butylcatecone, p-benzoquinone, 2,5-t-butyl-hydroquinone, phenothiazine, and the like, are cured by ultraviolet rays for optical discs. It is described that it can be used in the range of 0.1 to 5% by mass based on the whole mold composition.
- a technique is disclosed in which an adhesive composition containing an acrylic compound selected from (meth) acrylic acid and its ester, a peroxystere polymerization initiator, a gallic acid derivative, and other additives is used as a first liquid.
- an adhesive composition containing an acrylic compound selected from (meth) acrylic acid and its ester, a peroxystere polymerization initiator, a gallic acid derivative, and other additives is used as a first liquid.
- the problem is that when an optical disk provided with a reflective film of silver or an alloy containing silver as a main component is exposed to an interior light such as a fluorescent lamp, the reflective film changes to lower the reflectivity and reduce the pI. This causes an increase in the error (parity of inner-code error), and in extreme cases makes it impossible to read information. Overcoming this problem is very important for improving the practical characteristics of an optical disc having a reflective film made of silver or an alloy containing silver as a main component.
- an object of the present invention is to prevent the reflective film from being blackened even when exposed to an interior light such as a fluorescent light, thereby causing an increase in a signal reading error (PI error) and a decrease in the reflectance.
- An object of the present invention is to provide an optical disk having no light, having excellent light resistance, and having a reflective film made of silver or an alloy containing silver as a main component. Disclosure of the invention
- Patent Documents 1 to 3 In attempting to solve the problems of the present invention, the present inventors studied an optical disc using the ultraviolet-curable composition described in the examples of the above-described conventional techniques (Patent Documents 1 to 3). did. However, in each of the above-mentioned prior arts, there is no mention of the light resistance of an optical disc using silver or an alloy containing silver as a main component as a translucent reflective film. No specific description is given of a specific ultraviolet-curable composition used for an optical disk provided with a semitransparent reflective alloy made of an alloy, and a specific additive used in this ultraviolet-curable composition.
- Patent Document 4 does not disclose bonding of an optical disk at all. Furthermore, Patent Document 4 does not indicate any particular means for improving the light resistance of an optical disc using silver or an alloy containing silver as a main component as a reflection film.
- the present inventors presume that the phenomenon in which the reflection film made of silver or an alloy containing silver as a main component turns black after exposure to a room light such as a fluorescent lamp is attributed to the surface oxidation of the reflection film.
- compositions for forming the resin layer provided on the reflective film various antioxidants such as citric acid, tartaric acid, malic acid, lactic acid, hydroxypyruvic acid, dimethylolpropionic acid, ⁇ -hydroxyiso UV curable compositions containing butyric acid, mandelic acid, 6-hydroxy-2-naphthoic acid, ⁇ -hydroxybenzoic acid, 5-hydroxyisophthalic acid, ⁇ -hydroxyphenylacetic acid, gallic acid, etc. were studied. . As a result, it was found that among the above compounds, only the system to which gallic acid was added was able to solve the above problem.
- the optical disc of the present invention includes a first reflective film for reflecting a laser beam for reading information on a first substrate, and further includes a cured film of an ultraviolet-curable composition on the first reflective film. Resin layer,
- the first reflection film is a reflection film made of silver or an alloy containing silver as a main component, and the ultraviolet-curable composition is
- RR 2 , R 3 , R 4 and R 5 are each independently: (i) a hydrogen atom, (ii) a halogen atom, (iii) a hydroxyl group, (iv) an alkoxyl having 1 to 8 carbon atoms. Group, (v) carboxy group, (vi) formula (2)
- R 6 represents an alkyl group having 1 to 20 carbon atoms which may be substituted with a halogen atom or an alkenyl group having 1 to 20 carbon atoms which may be substituted with a halogen atom).
- R 1 represents an alkyl group or an alkenyl group having 1 to 24 carbon atoms which may have a carboxyl group, an alkoxyl group, an acyloxyl group or an alkoxyl group as a substituent, or (vii) a substituent; At least one of R 2 , R 3 , R 4 and R 5 is a hydroxyl group), and
- the reflection film made of silver or an alloy containing silver as a main component does not blacken, and the signal reading error (PI error) increases. And an optical disk with little change in reflectance can be obtained. For this reason, it is easy to use silver or an alloy containing silver as a main component as the material of the translucent reflective film or the reflective film that forms the information recording layer, and the low-cost and highly reliable “DVD-9” type It is possible to supply an optical disk such as that described above.
- the ultraviolet-curable composition used in the optical disc of the present invention provided with a reflective film made of silver or an alloy containing silver as a main component contains the compound represented by the above formula (1).
- the reflective film in this specification is a translucent reflective film for reflecting a laser beam for reading information or a completely reflective film that does not substantially transmit the laser beam.
- (meth) acrylic acid means acrylic acid or methacrylic acid, and the same applies to derivatives of acrylic acid or methacrylic acid.
- the compound represented by the formula (1) includes compounds having various structures, and among them, gallic acid or gallic acid ester represented by the following formula (3) is preferable.
- R 7 is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms which may be substituted with a halogen atom, or an alkyl group having 1 to 20 carbon atoms which may be substituted with a halogen atom. Represents a group
- the alkyl group and the alkenyl group may be branched or linear, and the halogen atom is preferably a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.
- R 7 is preferably a hydrogen atom or an unsubstituted alkyl group which may have a branched chain having 1 to 20 carbon atoms, and a hydrogen atom or an unsubstituted branched chain having 1 to 8 carbon atoms. More preferably, it is an alkyl group which may have a chain. Further, a hydrogen atom or an unsubstituted alkyl group having 1 to 4 carbon atoms is particularly preferable.
- gallic acid ester examples include methyl gallate, ethyl gallate, propyl gallate, isopropyl gallate, There are isopentyl gallate, octyl gallate, dodecyl gallate, tetradecyl gallate, hexadecyl gallate, octadecyl gallate and the like.
- gallic acid is preferably used.
- Gallic acid is easily available as a commercial product, for example, from Dainippon Pharmaceutical Co., Ltd.
- R 8 , R 9 , R 1Q and R 11 are each independently a hydrogen atom, a halogen atom Child, an alkoxyl group having 1-8 carbon atoms, as substituents - C00H, - C00R 12, - 0C0R 13 or - carbon atoms, which may have a OR ".
- R 8 , R 9 , R 1 () and R 11 are, specifically, (i) a hydrogen atom, (ii) a fluorine atom, a chlorine atom, a bromine atom or a halogen atom such as an iodine atom.
- alkoxyl groups such as methoxy, ethoxy, butoxy and octyloxy
- alkyl groups such as methyl, butyl, hexyl, octyl, lauryl or octadecyl
- V ethenyl, propenyl or 2- Alkenyl groups such as butenyl
- catechol preferred are catechol, 3-sec-butyl techno-ole, 3-tert-butynole techno-ole, 41-sec-butynole techno-ole, 4-tert-butyl-catechol, 3 , 5-di-tert-butynolecatechol, 3-sec-butynole-1-4-tert-butylcatecholene, 3-tert-butynolecate 51-sec-butynolecatechol, 4-octylcatechol and 4-stearyl Catechol is preferred, and catechol and 4-tert-butylcatechol are more preferred. In particular, it is preferable to use 4-tert-butyl catechol. 4-1 As a commercial product of tert-butyl catechol, for example, Dainippon Ink and Chemicals, Inc., trade name: DICTBC-5P.
- R 15 , R 16 , R 17 and R 18 are each independently a hydrogen atom, a halogen atom, an alkoxyl group having 1 to 8 carbon atoms, -C00H, -C00R 12 ,- 0C0R 13 or Is -alkyl group having 1 to 24 carbon atoms which may have OR 14 , or-
- R 19 , R 2 °, R 21 and R 22 are each independently a hydrogen atom, a halogen atom, an alkoxyl group having 1 to 8 carbon atoms, -C00H, -C00R 12 , - 0C0R 13 or - an alkyl group having carbon atoms which may have a oR 14 1 to 2 4, or as substituents - C00H, - C00R 12, -0C0R 13 or - which may have a oR 14 Carbon number: represents a alkenyl group having from 24 to 24 wherein R 12 , R 13 , and R ′′ each independently represent an alkyl group having 1 to 8 carbon atoms or an alkenyl group having 1 to 8 carbon atoms Represents a group)
- R 15 , R 16 , R 17 and R 18 in the formula (5) and R 19 , R 2fl , R 21 and R 22 in the formula (6) are specifically a hydrogen atom, a methyl group Propyl, hexyl, nonyl, dodecyl, iso-butyl, sec-butyl, tert-butyl, neopentyl, iso-hexyl, tert-octyl and the like.
- Preferred among the compounds represented by the formula (5) are hydroquinone, 2-hydroxyhydroxyquinone, 2,5-ditert-butylhydroquinone, 2,5-bis (1,1,3,3-tetra Methinolebutyl) hydroquinone, 2,5-bis (1,1-dimethylbutyl) no, and hydroquinone.
- Preferred among the compounds represented by the formula (6) are resorcinol (benzene-1,3-diol) and orcinol (5-methylbenzene-1,3-diol).
- the compound represented by the formula (5) is more preferable than the compound represented by the formula (6), and among the compounds represented by the formula (5), it is preferable that the compound represented by the formula: More preferably, quinone (benzene-1, 2, 4-triol) is used.
- quinone benzene-1, 2, 4-triol
- another compound that is preferably used in the present invention is pyrogallonone (1,2,3-trihydroxybenzene).
- the gallic acid or gallic ester represented by the formula (3) and the hydroquinone-based compound represented by the formula (5) include silver or silver.
- the amount of the compound represented by the formula (1) to be added to the ultraviolet-curable composition is preferably 0.05 to 10% by mass, more preferably 0 to 10% by mass, based on the whole ultraviolet-curable composition. It is 1 to 10% by mass.
- the content is more preferably 0.3 to 7% by mass, and particularly preferably 1 to 5 parts by mass. When the content is in the above range, the effect of improving light resistance is remarkable, and the compound represented by the formula (1) hardly precipitates in the ultraviolet-curable composition, and the composition is easy to handle.
- the cured film of the ultraviolet-curable composition using the compound of the formula (1) is an optical disk using silver or an alloy containing silver as a main component as a reflective film, and an indoor light such as a fluorescent lamp. Even when exposed to a light source of 500-650 nm, the reflection film made of silver or an alloy containing silver as a main component is prevented from turning black, and the signal reading error and the decrease in reflectivity are prevented. Does not occur.
- radical polymerizable conjugate used in the ultraviolet ray curable composition a radical polymerizable monomer and a radioactive polymerizable oligomer can be used.
- a radical polymerizable monomer a monofunctional (meth) acrylate or a polyfunctional (meth) acrylate can be used, and each of these can be used alone or in combination of two or more.
- radical polymerizable monomer a known compound can be used.
- (Meth) acrylates include, for example, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meta) acrylate, 1,]) desinole (meta) Athalylate, hexadecyl (meta) atalylate, octadecyl (meta) atalylate, isoamyl (meta) atalyle , Isodecyl (meth) atalylate, isostearyl (meth) atalylate, cyclohexyl (meth) atalylate, benzyl (meth) atalylate, methoxyxyl (meth) atalylate, butoxyshethyl (meta) acrylate, fenoxicetyl (Meta) Athalay small, phenoxydiethylene glycol (meta) atalylate, nony
- polyfunctional (meth) acrylates examples include 1,4-butanediol di (meth) acrylate, 3-methyl-1,5-pentanediol di (meth) acrylate, and 1,6- Xandiol di (meth) acrylate, neopentyldalichol di (meth) acrylate, 2-methyl-1,8-octanediol di (meta) acrylate, 2-butyl-2-ethyl-1,3-propanediol (meta) Di (meth) acrylate of tris (2-hydroxyshethyl) isocyanurate, such as acrylate, tricyclodecane dimethanol di (meth) acrylate, ethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate , Neopentylglycol 4 moles or more of ethylenoxa in 1 mole Di (meth) acrylate obtained by adding
- (Meth) acrylate trimethylolpropane, 3 mol or more of ethylene oxide or propylene oxide added to 1 mol of triol di- or tri (meth) atarylate, 4 mol per 1 mol of bisphenol A Di (meth) acrylate, trimethylate of diol obtained by adding at least mole of ethylene oxide or propylene oxide Roll propane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, poly (meth) acrylate of dipentaerythritol, ethylene oxide-modified phosphoric acid (meth) acrylate, ethylene oxide-modified alkyl diphosphoric acid (meth) atari Rates and the like.
- examples of the radical polymerizable oligomer include polyester (meth) acrylate, polyether (meth) acrylate, epoxy (meth) acrylate, and urethane (meth) acrylate.
- photopolymerization initiator used in the ultraviolet-curable composition any of those known in the art that can cure photoradical polymerizable compounds such as radical polymerizable monomers and radical polymerizable monomers can be used.
- photopolymerization initiator a molecular cleavage type or a hydrogen abstraction type is suitable for the present invention.
- radical photopolymerization initiators include benzoin isobutyl ether, 2,4-getylthioxanthone, 2-isopropylthioxanthone, benzyl, 2,4,6-trimethinolebenzoinoleinphenyinolephosphinoxide, and 2-benzinole —2—Dimethylamino-11- (4-morpholinophenyl) 1-butane-11-one, bis (2,6-dimethoxybenzoyl) -1,2,4,4-trimethylpentyl phosphinoxide and the like are preferably used.
- molecular-cleavable types include 1-hydroxycyclohexynolepheninoleketone, benzoinethyl ether, benzyldimethyl ketal, and 2-hydroxy-12-methyl-11-phenyl-2-olepropane One-one, One-one (4-Isopropynolefeninole) One-two-hydroxy 2-Methylpro Pan-one and 2-methyl-11- (4-methylthiophene) -12-morpholinopropane_1-one may be used in combination, and a hydrogen-abstraction-type photopolymerization initiator should be used.
- Nzophenone, 4-phenylbenzophenone, isophthalphenone, 4-benzoinole-4′-methinolazine phenylene sulfide and the like can also be used in combination.
- the amount of the radical photopolymerization initiator used is preferably in the range of 2% by mass to 10% by mass based on the whole of the ultraviolet curable composition.
- a sensitizer can be used for the above radical photopolymerization initiator, for example, trimethylamine, methyldimethanolamine, triethanolamine, p-dimethylaminoacetophenone, p-dimethylamino.
- Ethyl benzoate, p-di Amines that do not cause an addition reaction with the above-mentioned radically polymerizable component, such as isoamyl methylamino benzoate, N, N-dimethylbenzylamine and 4,4′-bis (getylamino) benzophenone can also be used in combination.
- antioxidants such as thermal polymerization inhibitors, plasticizers, hindered phenols, hindered amines, and phosphites can be used.
- silane coupling agents such as epoxy silane, mercapto silane, (meth) acryl silane and the like can be blended for the purpose of improving various properties. These are selected from those having excellent solubility in ultraviolet-curable compounds and those that do not hinder ultraviolet transmission.
- a hindered phenol-based antioxidant as an antioxidant to the ultraviolet-curable composition.
- the hindered phenol-based acidulant is preferably added in an amount of 0.01 to 5% by mass based on the entire ultraviolet-curable composition.
- the hindered phenol-based antioxidant it is preferable to use a compound represented by the following formula (7). Among them, 4,6-bis (octylthiomethyl) -o-cresol (the following formula (8)) is particularly preferable.
- IRGANOX152OL manufactured by Chipas-Pharti Chemicals Co., Ltd.
- the ultraviolet spring-curable composition used in the present invention contains 4,6-bis (octylthiomethyl) -1-o-cresol, whereby the durability in a high-temperature and high-humidity environment is improved. In particular, it is effective for preventing a decrease in reflectance in a high-temperature and high-humidity environment.
- R 23 represents an alkylene group having 1 to 10 carbon atoms which may have a branched chain
- R 24 and R 25 each independently represent a carbon atom which may have a branched chain.
- m is an integer of 1 to 5
- n is an integer of 0 to 4
- a UV-curable composition that is liquid at room temperature to 40 ° C. It is preferable not to use a solvent, and even if it is used, it is better to keep it as small as possible.
- the viscosity is preferably adjusted to 20 to 1000 mPa ⁇ s.
- the composition is used for a DVD, 100 to :! It is better to adjust to O O OmP a ⁇ s.
- the optical disc of the present invention using the ultraviolet-curable composition containing the compound represented by the above formula (1) has a first reflective film for reflecting a laser beam for reading information on a first substrate. And a structure in which a resin layer composed of a cured film of the ultraviolet curable composition is provided on the first reflection film.
- the optical disk of the present invention is an optical disk having such a structure or an optical disk partially having such a structure.
- a thin film of silver or an alloy containing silver as a main component is used as a light reflecting layer, and a resin layer made of a cured film of an ultraviolet curable composition is provided as a protective layer on the light reflecting layer.
- a substrate having a light reflecting layer made of a thin film of silver or an alloy containing silver as a main component is bonded to another substrate with an ultraviolet curable composition using the light reflecting layer as an adhesive surface. .
- the optical disc of the present invention further comprises a second layer for reflecting a laser beam for reading information on a resin layer comprising a cured film of the ultraviolet-curable composition provided on the first reflective film.
- At least one of two optical disk substrates provided with a reflective film for reflecting a laser beam for reading information has silver or an alloy containing silver as a main component on its surface.
- a laminated optical disk such as DVD-19, DVD-18, DVD-10, etc., having a reflective film made of, and bonding the two optical disk substrates with the reflective films of the two substrates as bonding surfaces. There is.
- a substrate generally used as an optical disk substrate can be used, and particularly, a polycarbonate substrate can be suitably used.
- the “alloy containing silver as a main component” used for an optical disc is, for example, the ratio of silver to gold (Ag x Au Y ) described in US Pat. Silver alloy.
- the type of the optical disk of the present invention is preferably a read-only DVD, such as "DVD-5", “DVD-10", “DVD-9” and “DVD-18", writable DVD-R, DVD + R, rewritable DVD-RW, DVD + RW, DVD-RAM and other DVDs, and particularly preferably "DVD-9” and "DVD-18".
- the reflective film made of silver or silver-based alloy in “DVD-9” and “DVD-18” has a thickness of 10 to 30 nm, and is mainly composed of silver or silver in other types of DVD. It is thinner than the reflective film made of alloy.
- the ultraviolet-curable composition used in the present invention has sufficient light resistance even when used on a thin film of silver or an alloy containing silver as a main component. It is most suitable as a UV-curable composition for use in read-only DVD-9 and DVD-18, which have a translucent reflective film made of an alloy mainly composed of:
- the optical disk of the present invention is not limited thereto. For example, a cured film of this composition is formed on a thin film of silver or an alloy containing silver as a main component on an optical disk substrate having a thickness of about 1.
- SACD Super Audio CD
- the ultraviolet-curable composition used in the following production examples is the ultraviolet-curable composition containing the compound represented by the above formula (1) used in the present invention. means.
- the second reflection film for example, a film mainly containing aluminum, silver, or an alloy mainly containing silver can be used.
- a substrate known as an optical disk substrate can be used as the substrate for an optical disk substrate.
- ammonium polyolefin, polymethyl methacrylate, polycarbonate and the like can be mentioned, and it is particularly preferable to use a polycarbonate substrate.
- an ultraviolet-curable composition was applied onto the metal thin film (second reflective film) of the substrate (A: second substrate), and a translucent reflective film (first reflective film) was further laminated.
- the substrate (B: the first substrate) is coated on a metal thin film (the second reflection film) with ultraviolet light so that the surface of the translucent reflection film (the first reflection film) becomes an adhesive surface.
- the substrate (A: second substrate) is bonded via the curable composition, and ultraviolet light is irradiated from one or both surfaces of the two bonded substrates, and the two are bonded to each other to form “DVD-9”. I do.
- the metal thin film (second reflective film) formed on the substrate (A: second substrate) was left on the substrate (B: first substrate) side.
- the substrate (B: first substrate) / semi-transparent reflective film (first reflective film) / cured film of ultraviolet curable composition Z A disk intermediate in which metal thin films (second reflective films) are sequentially laminated is manufactured. Prepare two such disk intermediates. Then, by using the metal thin film (first reflective film) of the intermediate body of the two discs as an adhesive surface and bonding them so as to face each other, “DVD-18” is obtained.
- a second substrate (C 1: first substrate) and (C 2: second substrate) for an optical disk on which a 40 to 60 nm reflective film is laminated are prepared.
- An ultraviolet curable composition is applied on the reflective film (first reflective film) of one substrate (C1: first substrate), and the other substrate (C2: second substrate) is reflected.
- the ultraviolet irradiation can be performed by a continuous light irradiation method using a metal halide lamp, a high-pressure mercury lamp, or the like, or by a flash light irradiation method described in US Pat. No. 5,904,795.
- the flash irradiation method is more preferable in that curing can be performed efficiently.
- the content ratio of gallic acid is 0.1% by mass and 0.5% by mass. / 0 , 5% by mass, 6% by mass
- the UV-curable compositions of Examples 2 to 5 were prepared in the same manner as in the composition of Example 1 except for the above.
- An ultraviolet-curable composition of Example 6 was prepared in the same manner as in Example 1, except that 0.5% by mass of propyl gallate was used instead of gallic acid.
- the composition was filtered.
- compositions of Examples 1 to 4 were the same as the compositions of Examples 1 to 4 except that the antioxidant (trade name: IRGANOX 1520 L) was not used in the compositions of Examples 1 to 4.
- An ultraviolet-curable composition of Example 10 was prepared.
- the ultraviolet-curable composition of Example 11 was prepared in the same manner as in Example 1, except that gallic acid of Example 1 was changed to 4-tert-butylcatechol. Further, the content ratio of 4-tert-butyl catechol was 0.1% by mass (Example 12), 0.5% by mass (Example 13), 1% by mass (Example 14), 5% by mass.
- the UV-curable compositions of Examples 12 to 15 were prepared in the same manner as in the composition of Example 11 except that (Example 15) was used.
- Example 16 The ultraviolet-curable composition of Example 16 was prepared in the same manner as in Example 8, except that 0.5 part of gallic acid in Example 8 was changed to 0.5 part of hydroquinone.
- Example 17 An ultraviolet-curable composition of Example 17 was prepared in the same manner as in Example 8, except that 0.5 part of gallic acid in Example 8 was changed to 0.5 part of 2-hydroxyhydroquinone.
- Example 17 An ultraviolet curable composition of Example 17 was prepared in the same manner as in Example 8, except that 0.5 part of gallic acid in Example 8 was changed to 0.5 part of resorcinol.
- Example 8 the gallic acid in Example 8 was hydroquinone, and the content was 1% by mass (Example 19) and 3% by mass. /. (Example 20), 5% by mass (Example 21) Except for the above, the ultraviolet-curable compositions of Examples 19 to 21 were prepared in the same manner as the composition of Example 8.
- Example 22 An ultraviolet curable composition of Example 22 was prepared in the same manner as in Example 1, except that 0.05 parts of gallic acid of Example 1 was replaced with 0.5 part of hydroquinone.
- An ultraviolet-curable composition was prepared in the same manner as in Example 1, except that 0.05 part of gallic acid was not used.
- a UV curable composition was prepared in the same manner as in Example 1, except that 0.05 part of gallic acid and an antioxidant (trade name: IRGANOX 1520 L) were not used. .
- An ultraviolet-curable composition was prepared in the same manner as in Example 13 except that 4-tert-butylcatechol was changed to hydroquinone monomethinole ether in Example 13.
- Comparative Example 5 An ultraviolet-curable composition of Comparative Example 5 was prepared in the same manner as in Example 8, except that 0.5 part of gallic acid in Example 8 was changed to 0.5 part of 4-ethoxyphenol. ⁇ Comparative Example 6>
- An ultraviolet-curable composition of Comparative Example 6 was prepared in the same manner as in Example 8, except that 0.5 part of gallic acid in Example 8 was changed to 0.5 part of pn-butylphenol. ⁇ Comparative Example 7>'0.5 part of gallic acid of Example 8 was changed to 0.5 part of 23-dihydroxynaphthalene. An ultraviolet-curable composition of Comparative Example 7 was prepared in the same manner as in Example 8, except for the step 2i.
- a “D VD-9” having a silver alloy translucent reflective film was obtained by the following test method.
- a light resistance test fluorescent lamp exposure test
- Tables 1 to 4 show the evaluation results.
- Examples 1 to 10 and Example '16 to Example 22 and Comparative Examples 1 to 3 and Comparative Examples 5 to 7 were prepared by using the UV-curable compositions.
- the durability of a "DVD-9" type optical disc provided with a translucent reflective film of a silver alloy in a high temperature and high humidity environment was evaluated by the following test method. The evaluation results are shown in Tables 5 to 7, respectively.
- the ultraviolet-curable compositions of the above Examples and Comparative Examples were dispensed on a polycarbonate optical disc substrate on which pits of recorded information were formed and an aluminum thin film having a thickness of 50 nm was laminated thereon. Then, a polycarbonate optical disk substrate on which an alloy mainly composed of silver was laminated with a thickness of 15 nm as a translucent reflective film was laminated. Next, the cured coating film was rotated by a spin coater so that the thickness of the cured coating film became about 50 to 60 ⁇ m.
- An exposure test was performed under a fluorescent light to evaluate the light resistance.
- 20 W fluorescent lamps manufactured by Mitsubishi Electric, NEORMI SUPER FLR 20 SW / M (20 watts)
- Three parallel tubes are arranged on the same plane so that the center distance between the fluorescent lamps is 9 cm.
- An exposure test of the fluorescent lamp was performed with the optical disk reading surface (silver alloy semi-transparent reflective film side) facing the fluorescent lamp at a position 10 cm from the center fluorescent lamp. After exposure for 72 hours, the PI error and reflectance of each sample before and after the exposure were measured to evaluate the light resistance.
- each sample was exposed to high-temperature and high-humidity conditions. A dew test was performed.
- the test was conducted under the high temperature and high humidity environment of 80 ° C, 85% RH, 240 hours using “PR-2PK” manufactured by Espec Corporation.
- PR-2PK manufactured by Espec Corporation.
- the PI error and the reflectance of the information recording layer (referred to as L0) with the silver alloy translucent reflective film were measured and evaluated.
- the pI error and the reflectance were measured by “S A-300” manufactured by Au Dio Dev e Opment.
- the PI error ratio (the number of errors after the test / the number of errors before the test) and the ratio of the reflectance (%) [(after the test / before the test) XI00] were calculated and evaluated.
- the column for PI error determination is
- the column for determining the reflectivity is based on the DVD-9 standard.
- TMBDPO 2,4,6-trimethylbenzinoresiphenyl-phosphophosphide
- Example 1 Example 1 2 Example 1 3 Example 1 4 Example 1 5 Comparative Example 4
- Example 7 Example 8
- Example 9 Example 10 0 Comparative Example 2 Comparative Example 3
- the reflection film made of silver or an alloy containing silver as a main component does not blacken, and the signal reading error (PI error) increases. And an optical disk with little change in reflectance can be obtained. For this reason, it is easy to use silver or an alloy containing silver as a main component as the material of the translucent reflective film or the reflective film that forms the information recording layer. It becomes possible to supply an optical disc such as
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Optical Head (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Glass Compositions (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20040788440 EP1669989B1 (en) | 2003-09-30 | 2004-09-28 | Optical disk |
CN200480028159.9A CN1860536B (zh) | 2003-09-30 | 2004-09-28 | 光盘 |
CA 2540441 CA2540441C (en) | 2003-09-30 | 2004-09-28 | Optical disk |
AT04788440T ATE552591T1 (de) | 2003-09-30 | 2004-09-28 | Optischer datenträger |
US10/573,709 US7749587B2 (en) | 2003-09-30 | 2004-09-28 | Optical disk |
HK07100689A HK1094082A1 (en) | 2003-09-30 | 2007-01-19 | Optical disk |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-340350 | 2003-09-30 | ||
JP2003340350 | 2003-09-30 | ||
JP2003424804 | 2003-12-22 | ||
JP2003-424804 | 2003-12-22 |
Publications (1)
Publication Number | Publication Date |
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WO2005031729A1 true WO2005031729A1 (ja) | 2005-04-07 |
Family
ID=34395625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/014556 WO2005031729A1 (ja) | 2003-09-30 | 2004-09-28 | 光ディスク |
Country Status (8)
Country | Link |
---|---|
US (1) | US7749587B2 (ja) |
EP (1) | EP1669989B1 (ja) |
CN (1) | CN1860536B (ja) |
AT (1) | ATE552591T1 (ja) |
CA (1) | CA2540441C (ja) |
HK (1) | HK1094082A1 (ja) |
TW (1) | TWI349691B (ja) |
WO (1) | WO2005031729A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2020656A1 (en) * | 2006-05-24 | 2009-02-04 | DIC Corporation | Optical disk and ultraviolet-curable composition for optical disk |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7976922B2 (en) * | 2006-12-12 | 2011-07-12 | Ricoh Company, Ltd. | Optical recording medium |
CN102446521A (zh) * | 2011-12-27 | 2012-05-09 | 浙江华虹光电集团有限公司 | 数字多功能光盘及其制造方法 |
Citations (3)
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JPH02141284A (ja) * | 1988-11-24 | 1990-05-30 | Asahi Chem Ind Co Ltd | 新規な光学記録材料 |
JP2002265886A (ja) * | 2001-03-15 | 2002-09-18 | Nippon Kayaku Co Ltd | 光ディスク用接着剤組成物、硬化物および物品 |
JP2003213160A (ja) | 2002-01-25 | 2003-07-30 | Dainippon Ink & Chem Inc | 紫外線硬化型樹脂組成物及びこれを用いた光ディスク |
Family Cites Families (13)
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US5578415A (en) | 1988-09-12 | 1996-11-26 | Asahi Kasei Kogyo Kabushiki Kaisha | Optical recording materials, method for preparing the same and optical cards having the same |
DE69030982T2 (de) * | 1989-04-27 | 1997-11-13 | Canon Kk | Optisches Aufzeichnungsmedium und Verfahren zu seiner Herstellung |
JP2757217B2 (ja) | 1989-10-20 | 1998-05-25 | 電気化学工業株式会社 | 接着剤組成物 |
US6071667A (en) * | 1995-04-13 | 2000-06-06 | Hitachi Chemical Co., Ltd. | Photosensitive resin composition containing a photosensitive polyamide resin |
JP2001207085A (ja) * | 2000-01-28 | 2001-07-31 | Dainippon Ink & Chem Inc | 光記録媒体用紫外線硬化型保護膜組成物及び光記録媒体 |
JP2002146331A (ja) | 2000-11-14 | 2002-05-22 | Showa Denko Kk | 接着剤組成物ならびに接着体および光ディスクの製造方法 |
JP4641628B2 (ja) | 2001-01-23 | 2011-03-02 | 日本化薬株式会社 | 接着剤組成物、光ディスク用接着剤組成物及びその硬化物。 |
JP2002285042A (ja) | 2001-03-27 | 2002-10-03 | Dainippon Ink & Chem Inc | 光ディスク用紫外線硬化型組成物及び光ディスク |
CN1199859C (zh) * | 2001-07-04 | 2005-05-04 | 川化集团有限责任公司 | 一种亚硫酸铵用抗氧化剂 |
JP4229613B2 (ja) * | 2002-01-09 | 2009-02-25 | リンテック株式会社 | 光ディスク用保護フィルム及びそれを用いた光ディスク |
JP4016669B2 (ja) * | 2002-02-19 | 2007-12-05 | 大日本インキ化学工業株式会社 | 紫外線硬化型樹脂組成物及びこれを用いた光ディスク |
JP2003248972A (ja) * | 2002-02-22 | 2003-09-05 | Nagase Chemtex Corp | 光ディスク用紫外線硬化樹脂組成物 |
US6925051B2 (en) * | 2003-08-01 | 2005-08-02 | General Electric Company | Limited play data storage media and associated methods of manufacture |
-
2004
- 2004-09-27 TW TW093129245A patent/TWI349691B/zh not_active IP Right Cessation
- 2004-09-28 AT AT04788440T patent/ATE552591T1/de active
- 2004-09-28 CN CN200480028159.9A patent/CN1860536B/zh not_active Expired - Fee Related
- 2004-09-28 WO PCT/JP2004/014556 patent/WO2005031729A1/ja active Search and Examination
- 2004-09-28 US US10/573,709 patent/US7749587B2/en not_active Expired - Fee Related
- 2004-09-28 EP EP20040788440 patent/EP1669989B1/en not_active Not-in-force
- 2004-09-28 CA CA 2540441 patent/CA2540441C/en not_active Expired - Fee Related
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2007
- 2007-01-19 HK HK07100689A patent/HK1094082A1/xx not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH02141284A (ja) * | 1988-11-24 | 1990-05-30 | Asahi Chem Ind Co Ltd | 新規な光学記録材料 |
JP2002265886A (ja) * | 2001-03-15 | 2002-09-18 | Nippon Kayaku Co Ltd | 光ディスク用接着剤組成物、硬化物および物品 |
JP2003213160A (ja) | 2002-01-25 | 2003-07-30 | Dainippon Ink & Chem Inc | 紫外線硬化型樹脂組成物及びこれを用いた光ディスク |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2020656A1 (en) * | 2006-05-24 | 2009-02-04 | DIC Corporation | Optical disk and ultraviolet-curable composition for optical disk |
EP2020656A4 (en) * | 2006-05-24 | 2010-11-24 | Dainippon Ink & Chemicals | OPTICAL DISK AND ULTRAVIOLET CURABLE COMPOSITION FOR OPTICAL DISK |
US8722315B2 (en) | 2006-05-24 | 2014-05-13 | Dic Corporation | Optical disc and ultraviolet-curable composition for optical disc |
Also Published As
Publication number | Publication date |
---|---|
CA2540441C (en) | 2013-11-19 |
TW200517464A (en) | 2005-06-01 |
HK1094082A1 (en) | 2007-03-16 |
EP1669989A4 (en) | 2010-05-12 |
EP1669989A1 (en) | 2006-06-14 |
CN1860536B (zh) | 2014-03-05 |
TWI349691B (en) | 2011-10-01 |
CN1860536A (zh) | 2006-11-08 |
ATE552591T1 (de) | 2012-04-15 |
EP1669989B1 (en) | 2012-04-04 |
US7749587B2 (en) | 2010-07-06 |
CA2540441A1 (en) | 2005-04-07 |
US20070036935A1 (en) | 2007-02-15 |
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