WO2003052751A2 - Disques optiques colores et leurs procedes de fabrication - Google Patents

Disques optiques colores et leurs procedes de fabrication Download PDF

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Publication number
WO2003052751A2
WO2003052751A2 PCT/US2002/033503 US0233503W WO03052751A2 WO 2003052751 A2 WO2003052751 A2 WO 2003052751A2 US 0233503 W US0233503 W US 0233503W WO 03052751 A2 WO03052751 A2 WO 03052751A2
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WO
WIPO (PCT)
Prior art keywords
optical disc
equal
making
bonding
less
Prior art date
Application number
PCT/US2002/033503
Other languages
English (en)
Other versions
WO2003052751A3 (fr
Inventor
Vandita Pai-Paranjape
Steven R. Peak
Philippe Schottland
Verghese Thomas
Sharon S. Weis
Original Assignee
General Electric Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US09/683,346 external-priority patent/US6475589B1/en
Application filed by General Electric Company filed Critical General Electric Company
Priority to EP02776245A priority Critical patent/EP1459311A2/fr
Priority to KR10-2004-7009474A priority patent/KR20040070241A/ko
Priority to JP2003553560A priority patent/JP2005513694A/ja
Priority to AU2002342079A priority patent/AU2002342079A1/en
Publication of WO2003052751A2 publication Critical patent/WO2003052751A2/fr
Publication of WO2003052751A3 publication Critical patent/WO2003052751A3/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D17/00—Producing carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records; Producing record discs from master stencils
    • B29D17/005—Producing optically read record carriers, e.g. optical discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0041—Optical brightening agents, organic pigments
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/481—Non-reactive adhesives, e.g. physically hardening adhesives
    • B29C65/4815—Hot melt adhesives, e.g. thermoplastic adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/002—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2017/00—Carriers for sound or information
    • B29L2017/001—Carriers of records containing fine grooves or impressions, e.g. disc records for needle playback, cylinder records
    • B29L2017/003—Records or discs
    • B29L2017/005—CD''s, DVD''s
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2429/00—Carriers for sound or information
    • B32B2429/02—Records or discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
    • G11B7/256—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers improving adhesion between layers
    • 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

Definitions

  • This disclosure relates to a data storage media, and especially relates to a colored data storage media.
  • DVDs Digital Versatile Disks
  • CDs Compact disks
  • the disk construction has been changed.
  • the most fundamental and visible difference is that a DVD is no longer made of a single 1.2 mm thick plastic substrate but of two 0.6 mm halves that are bonded together ("DVD Demystified:" by Jim Taylor, ed. McGraw Hill, 1998).
  • the reading laser wavelength has changed from 780 nanometers (nm) in CDs, which is located in the near infrared part of the spectrum, to 635 or 650 nm for DVDs that is located in the visible spectrum.
  • the optical properties of the substrate are not the only requirements for DVDs.
  • the size of the pits is much smaller in a DVD, which implies that a DVD is more sensitive to resin quality (impurities) than a CD.
  • the rheology (flow characteristics) of the resin is important and tightly controlled.
  • inconsistencies in the thickness of the disk body are also a source of defects in optical disks.
  • a DVD is much more sensitive to the presence of such defects because it is not only thinner and read in the visible spectrum, but it is also read at a higher rotational/scanning speed than a regular CD.
  • the most advanced DVD formats that are multi-layered represent the highest degree of difficulty because of the presence of both a fully reflective and a semi-reflective layer associated with 2 layers of pits (e.g., patterning which forms geographic locators).
  • Single layered DVDs i.e. DVD-5 and DVD- 10
  • reflectivity requirements are very different between single layered and multi-layered disks.
  • the optical discs comprise: at least two plastic substrates comprising a bonding layer and a data layer disposed therebetween, wherein at least one of the substrates is a read side substrate comprising greater than or equal to about 0.01 wt% colorant, based upon the total weight of the read side substrate, and wherein the read side substrate has a UV Bonding Index of greater than or equal to about 0.5.
  • One method for making the optical disc comprises: forming a first plastic substrate comprising greater than or equal to about 0.01 wt% colorant, based upon the total weight of the first plastic substrate, wherein a UV Bonding Index of the first plastic substrate is controlled to be greater than or equal to about 0.5, disposing a data layer between the first plastic substrate and a second substrate, bonding the first plastic substrate to the second plastic substrate with a bonding layer, and curing the bonding layer.
  • Figure 1 is a schematic representation of a DVD 9 construction
  • Figure 2 is a schematic of a CD construction having a single reflective layer disposed at a second side of the substrate;
  • Figure 3 is a schematic of a DVD construction having a single reflective data layer disposed within the substrate
  • Figure 5 is a schematic of a DVD construction having a single reflective data layer and a single laser
  • Figure 1 1 is a graphical illustration of transmission curves of experimental formulations
  • Figure 12 are graphical illustrations of a spectral distribution of type "D" electrodeless bulb from fusion UV systems
  • Figure 13 is a graphical representation of a percentage of incident energy transmitted through substrates of experimental formulations.
  • Figure 14 is a graphical representation of the abso ⁇ tion spectrum of Daicure Clear SD-698 lacquer.
  • DVDs found on the market are made using clear (colorless) resin.
  • the clear disks show good optical/electrical properties (reflectivity, jitter, parity inner (PI) errors, birefringence, etc.) as well as good mechanical properties (radial/tangential/vertical tilt), even after aging at 80°C at 85% relative humidity (RH) for 4 days.
  • RH relative humidity
  • any type of DVD format e.g., single layered (such as DVD-5 and DVD- 10), multi-layered (such as DVD-9, DVD- 14, DVD- 18), and the like
  • an insufficient curing of the bonding layer otherwise known as the lacquer or adhesive
  • the insufficient curing of the bonding layer leads to tilt defects or, in the worst case, to a total adhesion failure where the two substrates do not stick to each other.
  • the process of bonding the plastic substrates of the DVD discs can be accomplished with UV light (e.g., in the about 330 to about 410 nanometer (nm) range) that irradiates the adhesive (e.g., photocurable bonding layer).
  • UV light e.g., in the about 330 to about 410 nanometer (nm) range
  • the adhesive e.g., photocurable bonding layer.
  • the issue with the colored discs is that the colored substrates exhibit some UV abso ⁇ tion with the amount of abso ⁇ tion dependent on the level of loading and chemical nature of the colorant.
  • the bonding problems occur when the amount of UV light transmission through the plastic substrate is low (for example, less than about 1 % of the UV light that would transmit through a clear substrate).
  • a threshold energy is transmitted through the colored substrate.
  • the threshold energy is defined by the total spectral energy (watts) transmitted in the about 330 to about 410 nm range. It should be emphasized that the threshold energy is herein defined with the same cure time as for a clear substrate. It is understood that a lower threshold energy could be employed with a longer cure time which could increase the efficiency of light abso ⁇ tion by the bonding layer and consequently improve bonding.
  • Typical curing time is less than about 3 seconds, with less than or equal to about 2 seconds preferred. However, the cycle time would be increased considerably which would negatively impact disc production rate and hence is not the method of choice.
  • the threshold energy can be quantified in terms of a parameter known as the "UV Bonding Index" which is a function of the abso ⁇ tion spectrum of the colored substrate as well as the spectral distribution of the irradiating source.
  • UV Bonding Index a parameter known as the "UV Bonding Index” which is a function of the abso ⁇ tion spectrum of the colored substrate as well as the spectral distribution of the irradiating source.
  • the product of the spectral energy output of the irradiating source and percentage transmission through the colored plastic substrate is first calculated as a function of wavelength over the entire UV-Visible spectrum. Integration of this curve over the wavelength range 330 nm to the bonding layer cutoff (i.e., to the point where the bonding layer no longer absorbs the light) provides a value for total energy transmitted through the colored substrate in that spectral range.
  • UV Bonding Index The ratio of the total energy passing through a colored substrate to that of the energy passing through a clear substrate (calculated by the above procedure) gives a value for the UV Bonding Index.
  • a UV Bonding Index of greater than or equal to about 0.5 can be employed, a UV Bonding Index of greater than or equal to about 1.0 is preferred, greater than or equal to about 2 is more preferred, greater than or equal to about 4.0 is even more preferred. It has been discovered that UV Bonding Indices of less than or equal to about 70, less than or equal to about 60, less than or equal to about 50, less than or equal to about 40, less than or equal to about 30, less than or equal to about 20, less than or equal to about 10, and even less than or equal to about 5 can be employed.
  • the UV Bonding Index can be calculated for any lamp. Some possible lamps include the Type 'D' bulb from Fusion UV Systems, Type FQ20007 bulb in the Flash Pulse UV curing system (Marubeni/Origin DVD Bonder), DVD Edge Cure lamp (M2 Co ⁇ .), RC742 lamps from Xenon Co ⁇ ., and the like. Similarly, the UV Bonding Index can be calculated for any bonding layer that absorbs light in at least a portion of the desired spectrum.
  • a digital versatile disk comprises two bonded plastic substrates (or resin layers) 1 , each typically having a thickness less than or equal to about 1.0 millimeter (mm), with a thickness of less than or equal to about 0.7 mm preferred. A thickness of greater than or equal to about 0.4 mm is also preferred. At least one substrate comprises one or more layers (e.g., 3, 5), of data.
  • Single sided DVD's i.e., those that will be read from a single readout surface 7 disposed on one side of the DVD), can additionally comprise a label 13 disposed on the side of the DVD opposite the readout surface 7.
  • a stamped surface is covered with a thin reflective data layer by a sputtering or other deposition process. This creates a metallic coating typically about 60 to about 100 angstroms (A) thick. (See Figures 3, 5, and 6)
  • the laser must be able to reflect from the first layer 3 when reading it, but also focus (or transmit) through the first layer 3 when reading the second layer 5.
  • the first layer 3 is "semi- transparent" (i.e., semi-reflective), while the second layer 5 is "fully-reflective".
  • metallization combination for the fully-reflective and semi-reflective data layers should be about 18 percent (%) to about 30% at the wavelength of the laser.
  • the laser wavelength generally employed is less than or equal to about 700 nm, with about 400 nm to about 675 nm preferred, and about 600 nm to about 675 nm more preferred.
  • the difference in reflectivity between subsequent reflective data layers should be controlled, in order to ensure sufficient reflectivity of the subsequent layer.
  • the difference in reflectivity between subsequent layers is less than or equal to about 5%, with less than or equal to about 4% preferred, and less than or equal to about 3.0% more preferred.
  • the reflective data layers are typically sputtered or otherwise disposed on a pattern (e.g., surface features such as pits, grooves, asperities, start/stop orientor, and/or the like) formed into a surface of the substrate via molding, embossing, or the like.
  • Depositions for example, can comprise sputtering a semi-reflective data layer over a first patterned surface.
  • a separator layer or protective coating can then be disposed over the semi-reflective data layer.
  • a 2 nd patterned surface can be formed (e.g., stamped or the like) in the side of the separator layer opposite the semi-reflective data layer.
  • the reflectivity of the reflective data layer(s) can be about 5% to about 100%, depending upon the number of reflective layers. If a single reflective data layer is employed, the reflectivity is preferably about 30% to about 100%, with about 35% to about 90% more preferred, and about 45% to about 85% even more preferred. If a dual reflective data layer is employed, the reflectivity of the data layers is preferably about 5% to about 45%, with about 10% to about 40% more preferred, about 15% to about 35% even more preferred, and about 18% to about 30% especially preferred. Finally, if multiple reflective data layers (e.g., greater than 2 reflective data layers readable from a single reading surface) are employed, the reflectivity is preferably about 5% to about 30%, with about 5% to about 25% more preferred.
  • the plastic substrate can comprise a resin such as an amo ⁇ hous, crystalline, or semi- crystalline thermoplastic, a thermoset, or a combination comprising at least one of the foregoing plastics.
  • plastics include polyetherimides, polyetheretherketones, polyimides, polyvinyl chloride, polyolefins (including, but not limited to, linear and cyclic polyolefins and including polyethylene, chlorinated polyethylene, polypropylene, and the like), polyesters (including, but not limited to, polyethylene terephthalate, polybutylene terephthalate, polycyclohexylmethylene terephthalate, and the like), polyamides, polysulfones (including, but not limited to, polyethersulfones, polyetherethersulfones, hydrogenated polysulfones, and the like), polyimides, polyether imides, polyether sulfones, polyphenylene sulfides, polyether ketones, polyether
  • R 1 is an aromatic organic radical and, more preferably, a radical of the formula (II):
  • each of A 1 and A 2 is a monocyclic divalent aryl radical and Y 1 is a bridging
  • dihydroxy compound includes, for example, bisphenol compounds having general formula (III) as follows:
  • R a and R b each represent a halogen atom or a monovalent hydrocarbon group and may be the same or different; p and q are each independently integers from 0 to 4; and X a represents one of the groups of formula (IV):
  • R c and R d each independently represent a hydrogen atom or a monovalent linear or cyclic hydrocarbon group and R c is a divalent hydrocarbon group.
  • dihydroxy compounds include dihydric phenols and the dihydroxy-substituted aromatic hydrocarbons disclosed by name or formula (generic or specific) in U.S. Patent No. 4,217,438.
  • a nonexclusive list of specific examples of the types of bisphenol compounds that may be represented by formula (III) includes the following: l ,l -bis(4-hydroxyphenyl) methane; l ,l -bis(4- hydroxyphenyl) ethane; 2,2-bis(4-hydroxyphenyl) propane (hereinafter "bisphenol A” or "BPA”); 2,2-bis(4-hydroxyphenyl) butane; 2,2-bis(4-hydroxyphenyl) octane; 1 ,1 - bis(4-hydroxyphenyl) propane; l ,l -bis(4-hydroxyphenyl) n-butane; bis(4- hydroxyphenyl) phenylmethane; 2,2-bis(4-hydroxy-l-methylphenyl) propane; 1 ,1 - bis(4-hydroxy-t-butylphenyl) propane; bis(hydroxyaryl) alkanes such as 2,2-bis(4- hydroxy-3-bromopheny
  • branching agents may comprise polyfunctional organic compounds containing at least three functional groups that may be hydroxyl, carboxyl, carboxyhc anhydride, haloformy], and mixtures comprising at least one of the foregoing groups.
  • Specific examples include t ⁇ mellitic acid, t ⁇ mellitic anhydride, t ⁇ mellitic trichloride, tns-p- hydroxy phenyl ethane, isatin-bis-phenol, t ⁇ s-phenol TC (l ,3,5-t ⁇ s((p- hydroxyphenyl) ⁇ sopropyl)benzene), t ⁇ s-phenol PA (4(4(1 , l -b ⁇ s(p-hydroxyphenyl)- ethyl) alpha,alpha-d ⁇ methyl benzyl)phenol), 4-chloroformyl phthalic anhydride, t ⁇ mesic acid and benzophenone tetracarboxylic acid, and the like
  • the branching agents may be
  • Preferred polycarbonates are based on bisphenol A, in which each of A 1 and A 2 is p- phenylene and Y 1 is isopropylidene.
  • the weight average molecular weight of the polycarbonate is about 5,000 to about 100,000, more preferably about 10,000 to about 65,000, and most preferably about 15,000 to about 35,000.
  • Fries and “Fries product” denote a repeating unit in polycarbonate having the formula (V)
  • X a is a bivalent radical as described in connection with formula (III) described above.
  • the polycarbonate composition may also include various additives ordinarily inco ⁇ orated in resin compositions of this type.
  • additives are, for example, fillers or reinforcing agents; heat stabilizers; antioxidants; light stabilizers; plasticizers; antistatic agents; mold releasing agents; additional resins; blowing agents; and the like, as well as combinations comprising at least one of the foregoing additives.
  • fillers or reinforcing agents include glass fibers, asbestos, carbon fibers, silica, talc and calcium carbonate.
  • heat stabilizers examples include triphenyl phosphite, tris-(2,6-dimethylphenyl)phosphite, tris-(mixed mono-and di- nonylphenyl)phosphite, dimethylbenzene phosphonate, and trimethyl phosphate.
  • antioxidants include octadecyl-3-(3,5-di-tert-butyl-4- hydroxyphenyl)propionate, and pentaerythrityl-tetrakis[3-(3,5-di-tert-butyl-4- hydroxyphenyl)propionate].
  • Examples of light stabilizers include 2-(2-hydroxy-5- methylphenyl)benzotriazole, 2-(2-hydroxy-5-tert-octylphenyl)-benzotriazole and 2- hydroxy-4-n-octoxy benzophenone.
  • plasticizers include dioctyl-4,5- epoxy-hexahydrophthalate, tris-(octoxycarbonylethyl)isocyanurate, tristearin and epoxidized soybean oil.
  • Examples of the antistatic agent include glycerol monostearate, sodium stearyl sulfonate, and sodium dodecylbenzenesulfonate.
  • mold releasing agents include stearyl stearate, beeswax, montan wax and paraffin wax.
  • other resins include but are not limited to polypropylene, polystyrene, polymethyl methacrylate, and polyphenylene oxide. Combinations of any of the foregoing additives may be used. Such additives may be mixed at a suitable time during the mixing of the components for forming the composition.
  • the composition may optionally include various additives ordinarily inco ⁇ orated in resin compositions of this type.
  • additives may include UV absorbers; stabilizers, such as light and thermal stabilizers (e.g., acidic phosphorous-based compounds); hindered phenols; zinc oxide, zinc sulfide particles, or combination thereof; lubricants (mineral oil, and the like); plasticizers; antioxidants; anti-static agents (tetra alkylammonium benzene sulfonate salts, tetra alkylphosphonium benzene sulfonate salts, and the like); mold releasing agents (pentaerythritol tetrastearate; glycerol monstearate, and the like); and the like, and combinations comprising at least one of the foregoing additives.
  • stabilizers such as light and thermal stabilizers (e.g., acidic phosphorous-based compounds); hindered phenols; zinc oxide, zinc s
  • catalyst(s) may also be employed, namely in the extruder or other mixing device.
  • the catalyst typically assists in controlling the viscosity of the resulting material.
  • Possible catalysts include hydroxides, such as tetraalkylammonium hydroxide, tetraalkylphosphonium hydroxide, and the like, with diethyldimethylammonium hydroxide and tetrabutylphosphonium hydroxide preferred.
  • the catalyst(s) can be employed alone or in combination with quenchers such as acids, such as phosphoric acid, and the like. Additionally, water may be injected into the polymer melt during compounding and removed as water vapor through a vent to remove residual volatile compounds.
  • Adjacent substrates are attached together with an adhesive or bonding agent (e.g., separator or bonding layer).
  • an adhesive or bonding agent e.g., separator or bonding layer.
  • Any bonding agent having the desired optical qualities can be employed.
  • Some possible bonding agents include glue (e.g., hot glue), acrylic resin (e.g., ultra-violet (UV) curable acrylic resin, with transparent (i.e., greater than or equal to UV curable acrylic resin preferred), and the like, as well as combinations comprising at least one of the foregoing bonding agents.
  • the separating layer can comprise a transparent material.
  • Some possible separating layers include UV curable transparent resins.
  • the separating (bonding) layer is up to or exceeding several hundreds of micrometers ( ⁇ m) thick, with a thickness of less than or equal to about 100 ⁇ m useful, and a thickness of about 40 ⁇ m to about 70 ⁇ m typically employed with current DVD formats.
  • the colorant is preferably filtered, with melt filtering especially preferred, e.g., during adding in the extrusion process.
  • the size of the filtered colorant particles (and aggregates thereof) is less than or equal to about 200 nanometers (nm), with a particle (and aggregate) size of less than or equal to about 50 nm preferred.
  • Colorants are also preferably selected so that they solubilize in the material used to form the layer in which the colorant is disposed.
  • Colorants that are soluble in the materials used for DVD layers include dyes (e.g., "solvent dyes"), organic colorants, pigments, and the like, which behave like dyes; i.e., colorants that disperse in the plastic and do not form aggregates having a size greater than or equal to about 200 nm, with an aggregate size less than or equal to about 50 nm preferred.
  • colorants include, but are not limited to, those of the chemical family of anthraquinones, perylenes, perinones, indanthrones, quinacridones, xanthenes, oxazines, oxazolines, thioxanthenes, indigoids, thioindigoids, naphtalimides, cyanines, xanthenes, methines, lactones, coumarins, bis-benzoxaxolylthiophenes (BBOT), napthalenetetracarboxylic derivatives, monoazo and disazo pigments, triarylmethanes, aminoketones, bis(styryl)biphenyl derivatives, and the like, as well as combinations comprising at least one of the foregoing colorants.
  • BBOT bis-benzoxaxolylthiophenes
  • the colorant that has the lower abso ⁇ tivity at the desired wavelength e.g., at 650 nm, therefore exhibits the maximum transmission at this wavelength and is preferred.
  • Selection of colorants with high abso ⁇ tivity at the desired wavelength limits the maximum colorant loading possible to yield a functional multi-layered DVD. Since colorants with a lower abso ⁇ tivity at the desired wavelength can be used at higher loadings in the formulation it becomes easier to obtain the target color in a functional disk. For instance, Solvent Violet 13 is preferred over Solvent Blue 97 when trying to achieve a blue color because of its lower abso ⁇ tivity at 650 nm.
  • the colorant loading is greater than or equal to about 0.01 weight percent (wt%), with greater than or equal to about 0.02 wt% preferred, greater than or equal to about 0.04 wt% more preferred, greater than or equal to about 0.4 wt% even more preferred, and greater than or equal to about 0.5 wt% most preferred, based upon the total weight of the substrate comprising the colorant. It is further preferred to employ colorant in an amount of less than or equal to about 3.0 wt%, with less than or equal to about 2.0 wt% more preferred, less than or equal to about 1.0 wt% even more preferred, and less than or equal to about 0.75 wt% especially preferred.
  • layers such as protective layer(s) (e.g., lacquers, and the like), ultra-violet (UV) inhibitor layer(s), moisture barrier layer(s), ductility layer(s), and the like, as well as combinations comprising at least one of these layers, can be employed.
  • protective layer(s) e.g., lacquers, and the like
  • UV inhibitor layer(s) e.g., ultra-violet (UV) inhibitor layer(s)
  • moisture barrier layer(s) e.g., ductility layer(s), and the like
  • ductility layer(s) e.g., ductility layer(s), and the like
  • Table 1 lists the details of the formulations used. All six formulations were blended and pelletized in a single screw extruder at 290°C. DVDs were molded from the pelletized material using standard procedure and the discs were subjected to complete electrical (AudioDev DVDPro SA300 Pulsetech Drive) and mechanical (Dr. Schenk PROmeteus MT136) testing.
  • the total energy passing through the substrate about 330 to about 410 nanometers (nm) (obtained by an integration procedure) expressed as a fraction of energy transmitted through the clear substrate is tabulated below in Table 3.
  • Table 3 is a comparison of total energy transmitted through disc substrates in the wavelength range of about 330 to about 410 nm, expressed as a function of percent energy transmitted through clear substrate.
  • the UV Bonding Index is tabulated below in Table 3.
  • formulations B and C transmit only 0.045% of the incident energy which, being below the threshhold level, leads to poor bonding.
  • formulations A, D and F have been developed to transmit 5.6%, 13.1% and 49% of the energy, respectively, which, being above the threshhold of 1%, provides good bonding capability.
  • the total energy absorbed by the initiator can also be calculated by integrating the product of the energy transmitted through the substrate and the absorbance of the initiator.
  • Figure 14 shows the abso ⁇ tion spectrum of Daicure clear SD-698, measured in 0.1 wt% methanol solution (Shimadzu Spectrophotometer commercially available from Shimadzu, Japan), an acrylic lacquer used in DVD bonding.
  • the total energy absorbed by the photoinitiator for each of the substrates A-F expressed as a percentage of the clear is tabulated below (Table 4).

Abstract

L'invention a trait à des disques optiques et à des procédés de fabrication de ces derniers. Dans un mode de réalisation, le disque optique comprend : au moins deux substrats de plastique (1) entre lesquels sont disposées une couche de liage et une couche de données, au moins l'un des substrats (1) étant un substrat de côté lecture comprenant au moins 0,01 % en poids de colorant, sur la base du poids total du substrat de côté lecture, et le substrat de côté lecture présentant un indice de liaison UV supérieur ou égal à 0,5 environ. L'invention concerne également un procédé de fabrication du disque optique consistant : à former un premier substrat de plastique comprenant au moins 0,01 % en poids de colorant, sur la base du poids total du premier substrat de plastique, l'indice de liaison UV du premier substrat de plastique étant adapté pour être supérieur ou égal à 0,5 environ ; à disposer une couche de données entre le premier substrat de plastique et un second substrat ; à lier le premier substrat de plastique au second substrat de plastique au moyen d'une couche de liage ; et à polymériser la couche de liage.
PCT/US2002/033503 2001-12-17 2002-10-16 Disques optiques colores et leurs procedes de fabrication WO2003052751A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP02776245A EP1459311A2 (fr) 2001-12-17 2002-10-16 Disques optiques colores et leurs procedes de fabrication
KR10-2004-7009474A KR20040070241A (ko) 2001-12-17 2002-10-16 착색된 광학 디스크 및 그의 제조 방법
JP2003553560A JP2005513694A (ja) 2001-12-17 2002-10-16 着色光ディスク及びその製造方法
AU2002342079A AU2002342079A1 (en) 2001-12-17 2002-10-16 Colored optical discs and methods for making the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US09/683,346 US6475589B1 (en) 2001-12-17 2001-12-17 Colored optical discs and methods for making the same
US09/683,346 2001-12-17
US10/063,906 2002-05-22
US10/063,906 US6673410B2 (en) 2001-12-17 2002-05-22 Colored optical discs and methods for making the same

Publications (2)

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WO2003052751A2 true WO2003052751A2 (fr) 2003-06-26
WO2003052751A3 WO2003052751A3 (fr) 2003-10-30

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JP (1) JP2005513694A (fr)
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1635341A2 (fr) 2004-09-14 2006-03-15 Taiyo Yuden Co., Ltd. Support d'enregistrement d'information optique avec résistance à humiditité améliorée

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0980067A2 (fr) * 1998-08-10 2000-02-16 Fuji Photo Film Co., Ltd. Support de stockage optique de données
WO2001083595A1 (fr) * 2000-04-28 2001-11-08 Teijin Chemicals, Ltd. Granule de reference colore pour moulages optiques et substrat a disque optique colore
WO2003013214A2 (fr) * 2001-08-07 2003-02-20 General Electric Company Dvd colore

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0980067A2 (fr) * 1998-08-10 2000-02-16 Fuji Photo Film Co., Ltd. Support de stockage optique de données
WO2001083595A1 (fr) * 2000-04-28 2001-11-08 Teijin Chemicals, Ltd. Granule de reference colore pour moulages optiques et substrat a disque optique colore
WO2003013214A2 (fr) * 2001-08-07 2003-02-20 General Electric Company Dvd colore

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1635341A2 (fr) 2004-09-14 2006-03-15 Taiyo Yuden Co., Ltd. Support d'enregistrement d'information optique avec résistance à humiditité améliorée
EP1635341A3 (fr) * 2004-09-14 2008-02-13 Taiyo Yuden Co., Ltd. Support d'enregistrement d'information optique avec résistance à humiditité améliorée

Also Published As

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TWI273593B (en) 2007-02-11
AU2002342079A8 (en) 2003-06-30
EP1459311A2 (fr) 2004-09-22
JP2005513694A (ja) 2005-05-12
AU2002342079A1 (en) 2003-06-30
TW200303014A (en) 2003-08-16
WO2003052751A3 (fr) 2003-10-30

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