WO2006013662A1 - 光記録媒体の保護層形成用シート、光記録媒体およびそれらの製造方法 - Google Patents
光記録媒体の保護層形成用シート、光記録媒体およびそれらの製造方法 Download PDFInfo
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- WO2006013662A1 WO2006013662A1 PCT/JP2005/008437 JP2005008437W WO2006013662A1 WO 2006013662 A1 WO2006013662 A1 WO 2006013662A1 JP 2005008437 W JP2005008437 W JP 2005008437W WO 2006013662 A1 WO2006013662 A1 WO 2006013662A1
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- protective layer
- optical recording
- recording medium
- curing
- forming sheet
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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
- G11B7/2403—Layers; Shape, structure or physical properties thereof
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
Definitions
- the present invention relates to a sheet for forming a protective layer for protecting the surface of an optical recording medium, a method for manufacturing the same, an optical recording medium using the sheet, and a method for manufacturing the same.
- An optical disc is composed of an optical disc substrate made of polycarbonate, one or more information recording layers formed on the optical disc substrate, and a protective film adhered to the information recording layer via an adhesive layer.
- the information recording layer has a concavo-convex pattern forming pits.
- the information recording layer has a concavo-convex pattern forming groups and lands. It is formed.
- a photocurable resin is applied to the protective film or the information recording layer to form an adhesive layer, and the protective film and the information recording layer are formed using the adhesive layer.
- a method of bonding an information recording layer is known (Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 10-283683
- Patent Document 2 Japanese Patent Laid-Open No. 2002-25110 Disclosure of the invention
- the photocurable adhesive described in Patent Document 2 is mainly composed of a photocurable (meth) acrylic resin or ethylene / butyl acetate copolymer, but this photocurable adhesive is cured. Since the shrinkage ratio is large, there is a problem that the optical disk is warped when the film made of the photocurable adhesive is cured. In addition, since the film made of the photocurable adhesive has low shape retention, the thickness accuracy of the protective layer obtained is not necessarily high.
- the present invention has been made in view of such a situation, and a protective layer forming sheet having a pre-curing protective layer having a small curing shrinkage rate and high shape retention, and a method for producing the same, and
- An object of the present invention is to provide an optical recording medium having a small warp in which a protective layer having a high thickness accuracy is formed on an information recording layer without an adhesive layer, and a method for producing the same.
- the present invention comprises 20 to 90% by weight of an energy ray curable polymer and a polymer that does not have energy ray curable and can constitute a protective layer of an optical recording medium.
- a protective layer-forming sheet for an optical recording medium comprising a pre-curing protective layer comprising a composition containing 10 to 80% by weight (Invention 1).
- “having no energy beam curability” means that the material does not cure at a normal energy ray irradiation dose, and V is a dose amount of energy beam. This does not mean that it will not cure.
- optical recording medium in this specification refers to a medium on which information can be optically recorded / reproduced, and is mainly a read-only, write once or rewritable disc-like medium (for example, CD, CD-ROM, CD-R, CD-RW, DVD, DVD-ROM, DVD-R, DVD-RW, DVD-RAM—LD, Blu-ray Disc ⁇ MO, etc .; Including)), but these are not necessarily limited.
- a composition containing an energy ray curable polymer and a polymer that does not have energy ray curable properties and can form a protective layer of an optical recording medium is used.
- a polymer By using a polymer, a protective layer with a low curing shrinkage can be obtained, and in particular, a polymer that does not have energy-line curability and can constitute a protective layer of an optical recording medium is used.
- a pre-curing protective layer having high shape retention can be obtained.
- an optical recording medium obtained by using such a protective layer forming sheet there is no adhesive layer for adhering the protective layer, and since the thickness accuracy of the protective layer is high, good signal characteristics are obtained. As a result, the warpage associated with the curing of the protective layer before curing is suppressed.
- the glass transition temperature, transmittance, and refractive index of the protective layer obtained can be easily controlled. Therefore, physical properties suitable as a protective layer for an optical recording medium can be obtained.
- the protective layer before curing is laminated on the smooth surface of a substrate having a smooth surface having a surface roughness (Ra) of 0.1 m or less (Invention). 2) Furthermore, it is preferable that the surface roughness (Ra) is sandwiched between the smooth surfaces of two substrates having a smooth surface of 0.1 ⁇ m or less (Invention 3). .
- the smoothness of at least one surface of the pre-curing protective layer is increased, and better signal characteristics can be obtained by bringing this surface into close contact with the information recording layer. it can.
- the smoothness of both surfaces of the protective layer before curing is improved, so that even better signal characteristics can be obtained.
- the weight average molecular weight of the energy beam curable polymer is preferably 100,000 or more (Invention 4).
- the polymer that does not have energy ray curability and can form a protective layer of an optical recording medium is preferably a methacrylic resin, polycarbonate, or polyfluoroolefin.
- Masashi Invention 5
- the storage elastic modulus of the composition before curing is 1 X 10 3
- the storage elastic modulus of the composition after curing is preferably 1 X 10 6 Pa or more (Invention 7).
- the glass transition temperature after curing of the yarn and the composite is preferably 60 ° C or higher (Invention 8).
- the transmittance of light having a wavelength of 400 nm or more after curing of the yarn and the composite is preferably 85% or more (Invention 9).
- the linear expansion coefficient after curing of the composition is 0.3 X 1 0 _4 to 2.0 X 10 _4 Z ° C. Ten).
- the adhesive strength after curing of the composition to the information recording layer (the reflective layer or the transflective layer) of the optical recording medium is 0.1 lNZ25 mm or more. Is preferred (Invention 11).
- the refractive index after curing of the yarn and the composite is preferably 1.45 to L75 (Invention 12).
- the present invention relates to a method for producing a protective layer forming sheet for an optical recording medium provided with a pre-curing protective layer, comprising 20 to 90% by weight of an energy ray curable polymer, and having an energy ray curable property.
- a composition containing 10 to 80% by weight of a polymer that can form a protective layer of an optical recording medium without being coated on the first plane and dried, and on the first plane and the second plane Accordingly, the present invention provides a method for producing a protective layer forming sheet for an optical recording medium, wherein the pre-curing protective layer is formed by sandwiching (Invention 13).
- Plane may be a plane of a sheet-like base material! /, but is not limited to this, for example, a plane of a table or the like. Also good. Further, the object having the flat surface does not necessarily have to be laminated on the protective layer before curing in the protective layer forming sheet of the recording medium.
- drying of the composition coated on the first flat surface is a polymer glass that does not have the energy ray curability and can constitute a protective layer of an optical recording medium. It is preferable to carry out at a temperature higher than the transition temperature (Invention 14).
- the present invention relates to a method for manufacturing an optical recording medium comprising an optical recording medium substrate, one or more information recording layers, and a protective layer.
- the protective layer-forming sheet of the optical recording medium (Invention 1 to 12) is pressure-bonded to the layer, and the protective layer is cured by irradiation with an energy line, thereby protecting the optical recording medium.
- Shape layer An optical recording medium manufacturing method is provided (Invention 15).
- the present invention relates to a method for manufacturing an optical recording medium comprising an optical recording medium substrate, one or more information recording layers, and a protective layer, wherein the outermost information recording is performed.
- the surface of the protective layer forming sheet (Inventions 2 to 12) of the optical recording medium before curing, which is in contact with the smooth surface of the base material in the protective layer forming sheet, is the information layer.
- a method for producing an optical recording medium characterized in that the protective layer before curing is formed by pressure bonding so as to be on the recording layer side, and the protective layer of the optical recording medium is formed by irradiation with energy rays. (Invention 16).
- the present invention provides an optical recording medium comprising a protective layer obtained by curing the protective layer before curing of the protective layer-forming sheets (Inventions 1 to 12) of the optical recording medium. Provided (Invention 17).
- the present invention relates to an optical recording medium substrate, one or more information recording layers, and a protective layer before curing of a protective layer forming sheet of the optical recording medium (Inventions 2 to 12).
- a protective layer formed by curing, and the protective layer is laminated on the information recording layer so that the surface on the other side is in contact with the smooth surface of the base material in the protective layer before curing and the surface on the other side is the information recording layer side.
- An optical recording medium characterized by the above is provided (Invention 18).
- the protective layer before curing in the protective layer forming sheet of the optical recording medium of the present invention has a low curing shrinkage rate and high shape retention. Therefore, according to the present invention, the warp of the optical recording medium accompanying the curing of the protective layer before curing can be suppressed, and the protective layer having a high thickness accuracy can be formed on the information recording layer without using the adhesive layer. As a result, an optical recording medium having good signal characteristics can be obtained.
- FIG. 1 is a cross-sectional view of a protective layer forming sheet for an optical disc according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing an example of an optical disc manufacturing method using the protective layer forming sheet of the optical disc according to the embodiment.
- FIG. 1 is a cross-sectional view of a protective layer forming sheet for an optical disc according to an embodiment of the present invention
- FIGS. 2 (a) to 2 (g) use the protective layer forming sheet for an optical disc according to the embodiment. It is sectional drawing which shows an example of the manufacturing method of an optical disc.
- the protective layer forming sheet 1 of the optical disc includes a protective layer 11 before curing, and a base material 12 laminated on one surface of the protective layer 11 before curing.
- the base materials 12 and 12 ′ are peeled off when the protective layer forming sheet 1 is used.
- the pre-curing protective layer 11 comprises an energy ray-curable polymer (I), a polymer ( ⁇ ) that does not have energy ray curability and can form a protective layer of an optical disk, and optionally a third component (III). It is composed of a composition containing and and is cured by irradiation with energy rays to form a protective layer 11 ′ of optical disc D.
- the energy ray curable polymer (I) is a polymer that is cured by irradiation with energy rays. By combining this energy beam curable polymer (I) and the polymer (II) described later, the pre-curing protective layer 11 having a small curing shrinkage can be obtained.
- the weight average molecular weight (Mw) of the energy ray curable polymer (I) is preferably 100,000 or more, more preferably 150,000 to 2,000,000. When the weight average molecular weight of the energy ray curable polymer (I) is less than 100,000, it is difficult to obtain the pre-curing protective layer 11 having a small curing shrinkage rate.
- the energy ray curable polymer (I) is preferably an acrylate ester copolymer having an energy ray curable group in the side chain. Further, this acrylate copolymer is obtained by reacting an acrylic copolymer (al) having a functional group-containing monomer unit with an unsaturated group-containing compound (a2) having a substituent bonded to the functional group.
- the energy ray-curable acrylic ester copolymer (A) having a weight average molecular weight (Mw) of 100,000 or more and having an energy-line curable group in the side chain is preferably obtained.
- the acrylate copolymer as described above can accurately follow the concave-convex pattern of the information recording layer, and has a desirable property as the protective layer 11 'of the optical disc D after curing. Can demonstrate.
- the average side chain introduction rate of the energy ray curable group in the energy ray curable acrylate copolymer (A) is preferably 0.1 to 50 mol%, particularly 3 to 30 mol%. Is preferred. If the average side chain introduction rate of the energy ray curable group is less than 0.1 mol%, the desired energy ray curable property cannot be obtained, and if the average side chain introduction rate of the energy ray curable group exceeds 50 mol%, In addition, the volume shrinkage rate at the time of curing of the pre-curing protective layer 11 is increased, and there is a possibility that the resulting optical disk D is warped.
- the average side chain introduction rate of the energy ray-curable group is calculated by the following equation.
- Average side chain introduction rate of energy ray curable group (number of moles of energy ray curable group Z total number of moles of monomers constituting acrylic copolymer) X 100
- the acrylic copolymer (al) is composed of a structural unit from which a functional group-containing monomer force is derived and a structural unit from which a (meth) acrylic acid ester monomer or derivative force is also derived.
- the (meth) acrylic acid ester monomer in this specification means an acrylic acid ester monomer and Z or methacrylic acid ester monomer.
- the functional group-containing monomer of the acrylic copolymer (al) includes a polymerizable double bond and functional groups such as a hydroxyl group, a carboxyl group, an amino group, a substituted amino group, and an epoxy group.
- a monomer contained in the molecule preferably a hydroxyl group-containing unsaturated compound or a carboxyl group-containing unsaturated compound.
- hydroxyl group-containing unsaturated compound examples include 2-hydroxyethyl acrylate, 2-hydroxy ethynole methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate. Hydroxyl group-containing (meth) acrylate, etc.
- carboxyl group-containing unsaturated compound examples include carboxyl group-containing compounds such as acrylic acid, methacrylic acid, and itaconic acid, and these are used alone or in combination of two or more.
- the (meth) acrylic acid ester monomer constituting the acrylic copolymer (al) includes a cycloalkyl (meth) acrylate, a benzyl (meth) acrylate, and an alkyl group having 1 to 18 carbon atoms.
- Some alkyl (meth) acrylates are used.
- an alkyl (meth) acrylate having an alkyl group having 1 to 18 carbon atoms such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (Meth) acrylate, 2-ethylhexyl (meth) acrylate, etc. are used.
- the acrylic copolymer (al) is usually composed of structural units derived from the functional group-containing monomer, usually 3 to: LOO wt%, preferably 5 to 40 wt%, particularly preferably 10 to 30 wt%.
- the content of the (meth) acrylic acid ester monomer or its structural unit that also leads to its derivative strength is usually 0 to 97% by weight, preferably 60 to 95% by weight, particularly preferably 70 to 90% by weight. It becomes.
- the acrylic copolymer (al) is obtained by copolymerizing a functional group-containing monomer as described above with a (meth) acrylic acid ester monomer or a derivative thereof in a conventional manner.
- a (meth) acrylic acid ester monomer or a derivative thereof in a conventional manner.
- dimethylacrylamide, vinyl formate, vinyl acetate, styrene, etc. may be copolymerized in a small amount (for example, 10% by weight or less, preferably 5% by weight or less).
- the substituent of the unsaturated group-containing compound (a2) can be appropriately selected depending on the type of functional group of the functional group-containing monomer unit of the acrylic copolymer (al). For example, in the case of a functional group strength S hydroxyl group, amino group or substituted amino group, an isocyanate group is preferred as a substituent, and a functional group preferred as a carboxyl group is a carboxyl group. In the case where the functional group which is preferable to a nate group, aziridinyl group, epoxy group or oxazoline group is an epoxy group, the substituent is preferably an amino group, a carboxyl group or an aziridyl group. One such substituent is contained in each molecule of the unsaturated group-containing compound (a2).
- the unsaturated group-containing compound (a2) contains 1 to 5, preferably 1 to 2, energy-polymerizable carbon-carbon double bond force per molecule.
- Specific examples of such unsaturated group-containing compound (a2) include, for example, 2-methacryloyloxychetyl isocyanate, methacryloprobe ⁇ , a-dimethylbenzyl isocyanate, methacryloyl isocyanate.
- the unsaturated group-containing compound (a2) is usually 10 to: LOO equivalent, preferably 20 to 95 equivalent, particularly preferably 25 per 100 equivalents of the functional group-containing monomer of the acrylic copolymer (al). Used in a proportion of ⁇ 90 equivalents.
- the reaction temperature, pressure, solvent, time The presence or absence of a catalyst and the type of catalyst can be appropriately selected.
- the functional group present in the side chain in the acrylic copolymer (al) reacts with the substituent in the unsaturated group-containing compound (a2), and the unsaturated group is converted into the acrylic copolymer (al ) Is introduced into the side chain of the polymer to obtain an energy ray curable acrylic acid ester copolymer (A).
- the reaction rate between the functional group and the substituent in this reaction is usually 70% or more, preferably 80% or more, and the unreacted functional group remains in the energy ray-curable acrylate copolymer (A).
- the amount of carboxyl groups and Z or hydroxyl groups present (residual) in the energy ray curable acrylate copolymer (A) (the sum of both if present)
- the amount is preferably from 0.01 to 30 mol%, more preferably from 0.5 to 25 mol%, in terms of monomer.
- the carboxyl group and Z or hydroxyl group contained in the functional group-containing monomer of the acrylic copolymer (al) reacts with the unsaturated group-containing compound (a2),
- the value calculated based on is the abundance of carboxyl groups and z or hydroxyl groups.
- the weight average molecular weight (Mw) of the energy ray curable acrylic ester copolymer (A) is preferably 100,000 or more, more preferably 150,000 to 1,500,000. It is preferably 10,000 to 1,000,000.
- the content of the energy ray-curable polymer (I) is 20 to 90% by weight, preferably 40 to 80% by weight.
- the content of the energy beam curable polymer (I) is less than 20% by weight, the adhesion of the protective layer 11 before curing to the information recording layer and the followability to the concavo-convex pattern are deteriorated.
- the content of the energy ray curable polymer (I) exceeds 90% by weight, the content of the polymer (II) becomes too small, and a specific effect by the polymer (II) described later cannot be obtained.
- the polymer ( ⁇ ) is a polymer that does not have energy beam curability and can constitute a protective layer of an optical disk.
- this polymer (II) with the energy ray curable polymer (I), the pre-curing protective layer 11 having a small curing shrinkage can be obtained.
- the polymer (II) it is possible to obtain a pre-curing protective layer 11 having a high shape retaining property and to control the glass transition temperature, transmittance and refractive index of the protective layer 11 ′ obtained. It can be easily performed, and suitable physical properties can be obtained as the protective layer 11 ′ of the optical disk.
- does not have energy beam curability means that it is hard at normal energy beam doses. Specifically, for example, in the case of ultraviolet rays, it means that the composition does not cure at an irradiation amount of 1000 mj / cm 2 or less in the amount of light, and in the case of electron beams, an irradiation amount of 1500 krad or less .
- the polymer (II) a polymer that is suitable as a protective layer of an optical disc that does not have energy ray curability is used.
- Preferred examples of the polymer ( ⁇ ) include thermoplastic resin as a material having a high shape retaining property.
- methacrylic resin, polycarbonate or polycyclohexylene examples include a ring-opening polymer of a norbornene monomer, a hydrogenated product thereof, an addition polymer of a norbornene monomer, and a copolymer of a norbornene monomer and a bull compound. These polymers have high light transmittance and excellent heat resistance.
- the content of the polymer (II) is 10 to 80% by weight, preferably 20 to 60% by weight. If the content of the polymer (II) is less than 10% by weight, the effect of reducing the curing shrinkage of the protective layer 11 before curing and the effect of improving the shape retention cannot be obtained. On the other hand, if the content of the polymer (II) exceeds 80% by weight, the content of the energy ray curable polymer (I) becomes too small, and the adhesion to the information recording layer of the protective layer 11 before curing and the uneven pattern Follow-up performance decreases.
- the composition constituting the protective layer 11 before curing may contain a third component (III) other than the energy ray curable polymer (I) and the polymer (II)! /.
- third component (III) include energy ray-curable polyfunctional monomers and Z or polyfunctional oligomers, crosslinking agents, leveling agents, fine particles, catalysts, and other additives. It is done.
- ultraviolet rays when ultraviolet rays are used as the energy rays, the polymerization curing time and the amount of light irradiation can be reduced by adding a photopolymerization initiator as the third component (III).
- photopolymerization initiator examples include benzophenone, acetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoin benzoic acid, benzoin methyl benzoate, and benzoin.
- the photopolymerization initiator may be used in an amount in the range of 0.1 to 20 parts by weight, particularly 0.5 to 0 parts by weight with respect to 100 parts by weight of the energy ray curable polymer (I). preferable.
- Examples of the energy ray-curable polyfunctional monomer and cocoon or polyfunctional oligomer include isobornyl acrylate, dimethylol tricyclodecanedi (meth) acrylate, trimethylol propane tri (meth) acrylate, Pentaerythritol tri (meth) atarylate
- Pentaerythritol tetra (meth) acrylate dipentaerythritol hexa (meth) acrylate, 1,4 butanediol di (meth) acrylate, 1,6 hexanediol di (meth) acrylate, polyethylene glycol Examples include di (meth) acrylate, polyester oligo (meth) acrylate, polyurethane oligo (meth) acrylate.
- the properties of the cured product (protective layer 11 ′) can be controlled when the composition contains such an energy-line curable polyfunctional monomer and cocoon or polyfunctional oligomer.
- the energy ray-curable polyfunctional monomer and cocoon or polyfunctional oligomer are in the range of 10 to 400 parts by weight, particularly 30 to 200 parts by weight, per 100 parts by weight of the energy line curable polymer (I). It is preferable to be used in the amount of! /.
- a polyfunctional compound having reactivity with the functional group of the energy ray-curable polymer (I) can be used.
- examples of such polyfunctional compounds include isocyanato compounds, epoxy compounds, amine compounds, melamine compounds, aziridin compounds, hydrazine compounds, aldehyde compounds. Oxazoline compounds, metal alkoxide compounds, metal chelate compounds, metal salts, ammonium salts, reactive phenolic resins, and the like.
- the crosslinking agent is preferably used in an amount in the range of 0.01 to 10 parts by weight, particularly 0.1 to 5 parts by weight, based on 100 parts by weight of the energy ray curable polymer (I).
- leveling agent examples include dimethylsiloxane compounds, fluorine compounds, A surfactant or the like can be used.
- the composition contains a leveling agent that can be covered, the smoothness of the protective layer 11 (protective layer 11 ′) before curing can be improved.
- the content of the leveling agent is preferably 0 to 2 parts by weight with respect to 100 parts by weight of the energy ray curable polymer (1).
- the content is preferably from 0.01 to 0.5 parts by weight.
- Examples of the fine particles include silicon dioxide particles having an average particle diameter of 0.5 ⁇ m or less, titanium dioxide particles, aluminum oxide particles, tin oxide particles, calcium carbonate particles, barium sulfate particles, Inorganic fine particles such as talc, kaolin and calcium sulfate particles, the above inorganic oxide fine particles modified with an organic substance, or reactive particles described in, for example, Japanese Patent Laid-Open No. 2000-273272 .
- the composition contains fine particles that are effective, the hardness of the protective layer 11 ′ obtained can be improved, and the protective layer 11 ′ can be imparted with scratch prevention performance.
- the content of the fine particles is preferably 0 to 60 parts by weight with respect to 100 parts by weight of the energy ray curable polymer (I). It is preferably ⁇ 50 parts by weight.
- Examples of the catalyst include dibutyltin dilaurate, cobalt naphthenate, zinc naphthenate, stannous chloride, stannic chloride, tetra-n-butyltin, tri-n-butyltin acetate, and n-butyltin trioxide.
- organometallic catalysts such as potassium oleate can be used.
- the catalyst content is preferably 0.0005 to 1 part by weight with respect to 100 parts by weight of the compound containing a hydroxyl group. It is preferably 0.001 to 0.5 part by weight.
- Examples of other additives include ultraviolet absorbers, antioxidants, tackifiers, and cutlets. Examples include pulling agents and dyes.
- the content of other additives is 0 to 5 parts by weight in total of other additives with respect to 100 parts by weight of the energy ray-curable polymer (1). Particularly preferred is 0 to 3 parts by weight.
- the storage elastic modulus before curing of the composition constituting the protective layer 11 before curing is 1 X 10 3 to 1 X 10 6 Pa. L X 10 4 to 5 X 10 5 Pa It is particularly preferred.
- the measurement temperature of the “storage modulus before curing” is the same temperature as the working environment in which the protective layer 11 before curing and the information recording layer are pressure-bonded. That is, when the pre-curing protective layer 11 and the information recording layer are pressure-bonded at room temperature, the storage elastic modulus is measured at room temperature, and the pre-curing protective layer 11 and the information recording layer are pressure-bonded under heating. The storage elastic modulus is measured at the same temperature as the heating temperature.
- the storage elastic modulus before curing of the protective layer 11 before curing is less than 1 X 10 3 Pa
- the protective layer 11 before curing has fluidity and becomes unsuitable as the protective layer forming sheet 1 of the optical disc. There is a fear.
- the storage elastic modulus before curing of the protective layer 11 before curing exceeds 1 ⁇ 10 6 Pa
- the followability of the protective layer 11 before curing with respect to the information recording layer having a concave-convex pattern deteriorates, and the protective layer before curing There is a possibility that the adhesion between 11 and the information recording layer is lowered.
- the storage elastic modulus after curing of the composition constituting the protective layer 11 before curing is preferably 1 X 10 6 Pa or more, in particular 1 X 10 8 to 1 X lO ⁇ Pa Is preferred.
- the measurement temperature of the “storage modulus after curing” is the same temperature as the storage environment of the optical disk, that is, the room temperature.
- the strength of the formed protective layer 1 may be insufficient.
- the glass transition temperature after curing of the composition constituting the pre-curing protective layer 11 is preferably 60 ° C or higher, and particularly preferably 65 ° C or higher.
- a high-temperature environment can be considered as the optical disk usage environment, but if the glass transition temperature after curing of the composition (the glass transition temperature of the protective layer 11) is less than 60 ° C, it is suitable for the powerful optical disk usage environment. May not
- the transmittance of light having a wavelength of 400 nm or more after curing of the composition constituting the protective layer 11 before curing is 85% or more is preferable.
- a short wavelength laser for example, a blue-violet laser with a wavelength of 405 nm
- the linear expansion coefficient after curing of the composition constituting the protective layer 11 before curing is such that the optical disc does not warp even when used under wet heat conditions. It is preferable that the linear expansion coefficient of the disk substrate 2 is substantially the same.
- the optical disk substrate 2 is made of polycarbonate resin, its linear expansion coefficient is usually 0.8 X 10 _4 Z ° C.
- the cured linear line of the composition constituting the pre-curing protective layer 11 is used.
- 0 X 10 _4 Z ° is preferably in the range of C device particularly 0. 6 X 10 _4 ⁇ 1. is preferably OX 10 "V ° C.
- the adhesive strength after curing of the composition constituting the protective layer 11 before curing to the information recording layer of the optical disc D is 0.1 lNZ25 mm or more. Particularly preferred is 0.5 NZ25 mm or more. If the adhesive strength after curing of the composition is less than 0.1 NZ25 mm, peeling may occur between the formed protective layer 11 ′ and the information recording layer.
- the refractive index after curing of the composition constituting the pre-curing protective layer 11 is preferably 1.45 to L75, particularly preferably 1.45-1.55.
- a hard coat layer may be provided on the surface of the protective layer 11 ′ to prevent scratches. If the refractive index after curing of the yarn and the composition (refractive index of the protective layer 11 ′) is out of the above range, There is a possibility that the signal characteristics that are largely different from the refractive index of the hard coat layer may adversely affect the signal characteristics.
- the composition constituting the pre-curing protective layer 11 is such that the curl amount after curing of the sheet formed by laminating the pre-curing protective layer 11 (according to the test method of a test example described later) is 40 mm or less. It is preferable that If the curl amount exceeds 40 mm, the warp of the optical disc D accompanying the curing of the protective layer 11 before curing may increase.
- the thickness of the pre-curing protective layer 11 composed of the above composition is determined based on the standard of the optical disc, and is, for example, 100 m in the case of a single-sided single-layer Blu-ray Disc. Generally, it is about 95 to 105 ⁇ m, preferably about 97 to 103 ⁇ m.
- the base material to be peeled first (the base material 12' in this embodiment) is the pre-curing protective layer. It is necessary to have peelability with respect to 11, and the base material to be peeled later (the base material 12 in this embodiment) needs to have peelability with respect to the protective layer 11 after curing.
- the peeling force (peeling force A) of the surface on the protective layer 11 side before curing of the base material (base material 12 ') to be peeled first is preferably 150 mNZ25 mm or less.
- the peel force on the surface of the protective layer 11 before curing of the base material (base material 12) to be peeled after is preferably peel strength A or more and 200 mN / 2 5 mm or less! /.
- the surface roughness (Ra) of the surface on the protective layer 11 side before curing of the base material 12, 12 ', particularly the base material to be peeled first (base material 12') is 0.1 m.
- the following is preferable, and more preferably 0.05 ⁇ m or less.
- the substrates 12 and 12 ′ have such a surface roughness (Ra)
- smoothness can be imparted to the pre-curing protective layer 11 and thereby good signal characteristics can be obtained.
- the surface on the information recording layer side of the pre-curing protective layer 11 (protective layer 1) has a great influence on the signal characteristics of the optical disc, so that the substrate to be peeled first (substrate 12 ') is not cured. Control of the surface roughness (Ra) of the surface on the protective layer 11 side is important.
- the thickness of the substrates 12, 12 is usually about 5 to 300 / ⁇ ⁇ , and preferably 20 to LOO / z m.
- a coating agent containing the composition constituting the pre-curing protective layer 11 and optionally a solvent is prepared, and the coating is applied.
- the agent is applied onto the release-treated surface of the substrate 12 (or the substrate 12 ′) and dried to form the pre-curing protective layer 11.
- a coating machine such as a kiss roll coater, a reverse roll coater, a knife coater, a roll knife coater, or a die coater can be used.
- the drying temperature is preferably higher than the glass transition temperature of the polymer (II) described above, and particularly 30 to 40 ° C higher than the glass transition temperature of the polymer (II). Is preferred.
- the drying temperature of the pre-curing protective layer 11 is usually about 70 to 130 ° C.
- the drying time is preferably about 1 to 5 minutes.
- the surface of the formed pre-curing protective layer 11 is overlaid with the release surface of another base material 12 '(or base material 12), and the base material is laminated on the pre-curing protective layer 11. .
- the protective layer 11 before curing of the protective layer-forming sheet 1 produced in this way is sandwiched between the two substrates 12, 12 ', and therefore has high thickness accuracy. Further, since the surface state of the pre-curing protective layer 11 side of the base materials 12, 12 ′ is transferred to the surface of the pre-curing protective layer 11, the surface of the base materials 12, 12 ′ on the pre-curing protective layer 11 side is transferred. If the smoothness of is increased, the smoothness of the surface of the protective layer 11 before curing can also be increased.
- an optical disk substrate 2 having a concavo-convex pattern of pits or group Z lands is manufactured.
- the optical disk substrate 2 is usually made of polycarbonate and can be formed by a molding method such as injection molding.
- the reflective layer 3 is formed by means such as sputtering.
- the reflective layer 3 may be a single layer film, or may be a multilayer film such as a reflective film, a dielectric film, a phase change film, and a dielectric film.
- an energy ray curable stamper-receiving layer 4 is formed on the reflective layer 3.
- This stamper-receiving layer 4 is formed in a sheet-like sheet. It may be formed by attaching a tamper-receiving layer, or may be formed by applying a coating agent for the stamper-receiving layer 4 by a spin coating method or the like.
- the material of the stamper-receiving layer 4 for example, the energy ray curable polymer (I) described above can be used.
- the stamper S is pressed against the stamper-receiving layer 4, and the uneven pattern of the stamper S is transferred to the stamper-receiving layer 4.
- the shape of the stamper S shown in FIG. 2 (d) is a plate-like force, and is not limited to this, and may be a roll.
- the stamper receiving layer 4 is cured by irradiating the stamper receiving layer 4 with an energy line using an energy beam irradiation device.
- an energy beam irradiation device usually, ultraviolet rays, electron beams, etc. are used as energy rays.
- the stamper receiving layer 4 is cured and pits or group Z lands are formed by the uneven pattern of the stamper S, the stamper S and the stamper receiving layer 4 are separated, as shown in Fig. 2 (e). Then, the transflective layer 3 ′ is formed on the concavo-convex pattern of the stamper receiving layer 4 by means such as sputtering.
- the semi-transmissive reflective layer 3 ′ may be a single layer film or a multilayer film such as a semi-transmissive reflective film, a dielectric film, a phase change film, and a dielectric film.
- one of the base materials 12 'of the protective layer forming sheet 1 is peeled and removed to expose the pre-curing protective layer 11, and as shown in FIG. Crimp to the surface of the transflective layer 3 '.
- an energy irradiation device is used to irradiate the pre-curing protective layer 11 with energy to cure the pre-curing protective layer 11 to form the protective layer 11.
- the energy rays ultraviolet rays, electron beams and the like are usually used, and preferably ultraviolet rays are used.
- the amount of energy beam irradiation varies depending on the type of energy beam.
- the amount of irradiation is preferably about 10 to LOOOkrad in the case of an electron beam whose light intensity is preferably about 100 to 500 mJ / cm 2 .
- the protective layer 11 before curing is cured to form the protective layer 11 ', as shown in Fig. 2 (g), the other substrate 12 of the protective layer forming sheet 1 is peeled off and necessary. Accordingly, an overcoat layer such as a hard coat layer and an antifouling layer is formed on the surface of the protective layer 11 ′ to obtain an optical disc D.
- the hard coat layer includes polyester (meth) acrylate, urethane (meth) acrylate or epoxy (meth) acrylate, and (meth) acrylate.
- Force that is generally used by curing with an energy ray of a monomer The force that is generally used is not limited to this. For example, it is possible to use a material that has a siloxane bond.
- the antifouling layer for example, fluorine compounds, dimethylsiloxane compounds, fluorine-modified dimethylsiloxane compounds, and the like can be used.
- the optical disk manufacturing method using the protective layer-forming sheet 1 as described above it is not necessary to provide an adhesive layer when forming the protective layer 11 '. Can be manufactured. Moreover, since the protective layer 11 ′ of the protective layer forming sheet 1 has a high shape retaining property and the protective layer 11 ′ has high thickness accuracy, the resulting optical disc D has good signal characteristics. The production yield is also high. Further, since the protective layer 11 before curing of the protective layer forming sheet 1 has low curing shrinkage, warping of the optical disc D is suppressed when the protective layer 11 ′ is formed by curing the protective layer 11 before curing. The
- a single-sided, dual-layer optical disc was manufactured using the protective layer forming sheet 1, but the present invention is not limited to this, for example, the protective layer forming sheet 1 Can be used to manufacture a single-sided single-layer optical disc or the like.
- the substrate 12 or the substrate 12 'in the protective layer forming sheet 1 may be omitted.
- UV curable polymer solution (a) 200 parts by weight and a polymer not having UV curable property as a methacrylic resin (manufactured by Soken Igakusha, EF-43, solid content concentration: 50% by weight, Tg: 80 ° C) Photopolymerization initiator consisting of 80 parts by weight and oligo ⁇ 2 hydroxy 2 methyl 1 [4 (1 probe) phenol] propanone ⁇ (manufactured by Siebel Hegner, Japan, ESACURE KIP — 150, solid content concentration: 100% by weight) 3 parts by weight were mixed, and toluene was used as a diluent solvent to prepare a coating solution for a protective layer having a solid content concentration of 33% by weight.
- a polymer not having UV curable property as a methacrylic resin manufactured by Soken Igakusha, EF-43, solid content concentration: 50% by weight, Tg: 80 ° C
- Photopolymerization initiator consisting of 80 parts by weight and
- the above coating solution was dried on the release-treated surface of a heavy release type release film (manufactured by Lintec, SP-PET50C, substrate: polyethylene terephthalate, thickness: 50 m, Ra: 0.016).
- the film was coated with a knife coater to a film thickness of ⁇ m and dried at 110 ° C for 2 minutes to form a pre-curing protective layer.
- the protective layer-forming sheet is bonded to the protective layer before curing with a light-peeling release film (Lintec Corporation, SP-PET7511, base material: polyethylene terephthalate, thickness: 75 / ⁇ ⁇ , Ra: 0.015).
- Example 1 (a) 100 parts by weight of the ultraviolet curable polymer solution obtained in Example 1 (a) and a methacrylic resin (manufactured by Soken Igaku Co., Ltd., EF-43, solid content concentration: 50 weight 0 ) as a non-UV curable polymer (Tg: 80 ° C) 40 parts by weight and polyurethane originalate as a UV-curable polyfunctional oligomer (Dainippon Ink & Chemicals, Dudick RS24-156, solid content concentration: 100% by weight, molecular weight: 1600) and 30 parts by weight, isobornyl as an ultraviolet curable polyfunctional monomer - Le Atari rate (Shin-Nakamura I ⁇ Kogyo Co., NK-ester A-IB, solid concentration: 1 00 weight 0/0) and 20 parts by weight , Oligo ⁇ 2-hydroxy-2-methyl 1 [4 (1 probe) phenyl] propanone ⁇ (Nippon Siebel Hegner, ESA
- Copolymer of 98 parts by weight of butyl acrylate and 2 parts by weight of acrylic acid (weight average molecular weight (Mw): 700,000)
- Polyisocyanate 1 toy compound as a crosslinking agent 100 parts by weight
- Nippon Polyurethane Co., Ltd., Coronate L was added in an amount of 1 part by weight, and 200 parts by weight of ethyl acetate was added as a diluent solvent to adjust the solid content concentration to 33% by weight to obtain an adhesive coating solution.
- Example 2 A coating solution for the protective layer was prepared in the same manner as in Example 1 except that a polymer having no ultraviolet curing property was not mixed. Then, using the obtained coating solution, a protective layer forming sheet was produced in the same manner as in Example 1.
- the protective layer forming sheets obtained in Example and Comparative Example 2 were also irradiated with ultraviolet rays as the side force of the heavy release type release film (Lintec Corporation, device name: Adwill RAD-2000m / 8. Irradiation conditions: The illuminance was 310 mW / cm 2 , the light intensity was 200 mJ / C m 2 ), and the protective layer before curing was cured to form a protective layer. The storage elastic modulus (before curing) of the protective layer before curing was measured in advance.
- the light peelable peelable film and the heavy peelable peelable film are peeled off from the protective layer, and contacted with the light peelable peelable film of the protective layer in the following manner, the surface roughness of the side surface ( Ra), storage elastic modulus (after curing), glass transition temperature, linear expansion coefficient, 400 nm transmittance and refractive index of the protective layer were measured. The results are shown in Table 1.
- Storage elastic modulus The storage elastic modulus before curing was measured at 25 ° C at 1 Hz using a viscoelasticity measuring device (manufactured by Rheometrics, device name: DYNAMIC ANALYZER RDA II). Moreover, the storage elastic modulus after curing was measured at 25 ° C. at 3.5 Hz using a viscoelasticity measuring device (Orientec, Levibron DD V-II-EP).
- the adhesive strength of the protective layer forming sheets obtained in Examples and Comparative Example 2 was measured as follows. Remove the heavy release release film from the protective layer before curing of the protective layer forming sheet, and base material composed of 25 ⁇ m thick polyethylene terephthalate and 20 ⁇ m thick adhesive layer (adhesive: manufactured by Lintec, An adhesive tape consisting of PAT1) was attached to the protective layer.
- the release film was peeled off from the pressure-sensitive adhesive layer, and the exposed pressure-sensitive adhesive layer was deposited on the Ag vapor-deposited surface of the disk substrate on which 30-nm thick Ag was vapor-deposited Crimped at a pressure of 20N. Thereafter, in accordance with JIS Z0237, the adhesive force (180 ° peel strength) between the pressure-sensitive adhesive layer and the silver deposited surface of the disk substrate was measured. The results are shown in Table 1.
- the coating strength of the protective layer obtained in Example and Comparative Example 2 was applied to a polyethylene terephthalate film (manufactured by Torayen earth, PET50T-100, thickness: 50 m, no easy adhesion layer). m was applied using a knife coater and dried at 110 ° C. for 2 minutes to form a protective layer before curing. Then, UV light is irradiated from the protective layer side before curing (Lintech Co., Ltd., device name: Adwill 1 ⁇ 0- 200011178. Irradiation conditions: illumination 310 mW / cm 2 , light intensity 300 mJ / cm 2 ), before curing The protective layer was cured.
- Example 2 After drying the coating solution of the protective layer obtained in Example 1 on the release-treated surface of a heavy release type release film (manufactured by Lintec, SP-PET50C, substrate: polyethylene terephthalate, thickness: 50 m) The film was coated with a knife coater so that the film thickness of the film became 100 m, and dried at 110 ° C. for 2 minutes to form a protective layer before curing.
- a light release release film product name: SP-PET7511, substrate: polyethylene terephthalate, thickness: 75 ⁇ m
- the obtained protective layer forming sheet was cut into a width of 140 mm.
- the protective layer forming sheet after cutting was cut into a disk shape of ⁇ 120 mm.
- the lightly peelable release film of the protective layer-forming sheet after the punching process was peeled off, and the exposed pre-hardening protective layer was pressure-bonded to the recording layer surface of the disc substrate with a pressure of 20N. Then, UV light was irradiated from the disk substrate side (Lintech Co., Ltd., device name: Adwill RAD-2000m Uses Z8. Irradiation conditions: illuminance 310 mW / cm 2 , light quantity 300 mJ / C m 2 ), the protective layer before curing was cured to obtain an optical disc.
- Acrylic adhesive (Lintec Corp., LS058G) is applied to an easily adhesive polyethylene terephthalate film (Toyobo Co., Ltd., PET25A4100, thickness: 25 m) so that the film thickness force after drying is S15 m. It was coated using a knife coater and dried at 100 ° C for 1 minute to form an adhesive layer.
- the pressure-sensitive adhesive layer and release film (Lintec Corporation, SP-PET3811, base material: polyethylene terephthalate, thickness: 38 m) were bonded to obtain a protective film.
- Acrylic hard coat agent (JSR, product name: Desolite Z7524) is dried on a polycarbonate film (Teijin Chemicals, Pure Ace C110-75, thickness: 75 / zm). Apply with a bar coater to zm, dry at 80 ° C for 1 minute, and then irradiate with ultraviolet rays (Lintec, device name: Adwill RAD—2000mZ8. Irradiation condition: illumination 310mW / cm 2 , light quantity 300 mJ / cm 2 ), the hard coat layer was cured. Next, the release film of the protective film was peeled off and bonded to the hard coat layer.
- JSR product name: Desolite Z7524
- the obtained cover film was cut into a width of 140 mm.
- the cover film after cutting was cut into a disk shape of ⁇ 120 mm.
- the optical disc was obtained by pressure bonding to the recording layer surface of the recording substrate with a pressure of 20N.
- an optical disk can be produced with fewer steps than when a cover film is used.
- the present invention is useful for manufacturing an optical recording medium with good signal characteristics and suppressed warpage with a high yield with a small number of manufacturing steps.
Landscapes
- Manufacturing Optical Record Carriers (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Laminated Bodies (AREA)
Abstract
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JP2007291339A (ja) * | 2006-03-31 | 2007-11-08 | Bridgestone Corp | 光硬化性転写シート、これを用いた凹凸パターンの形成方法及び光情報記録媒体の製造方法、並びに光情報記録媒体 |
WO2007123151A1 (ja) * | 2006-04-19 | 2007-11-01 | Taiyo Nippon Sanso Corporation | 絶縁膜のダメージ回復方法 |
JP4808575B2 (ja) * | 2006-09-08 | 2011-11-02 | 株式会社クラレ | 光硬化性粘着フィルム |
JP5015663B2 (ja) * | 2007-05-31 | 2012-08-29 | 旭化成イーマテリアルズ株式会社 | インプリント用感光性樹脂積層体 |
WO2009081556A1 (ja) * | 2007-12-26 | 2009-07-02 | Mitsubishi Plastics, Inc. | 積層シート及び光記録媒体 |
TWI721158B (zh) * | 2016-04-28 | 2021-03-11 | 日商琳得科股份有限公司 | 保護膜形成用膜及保護膜形成用複合片 |
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