Abstract: The invention relates to transparent blends of polymers suitable for use in optical articles; the polymers contain residues of BCC and its derivatives, and have properties particularly suited for use in high density optical data storage media. The polymers further contain residues of other polymers, such as ?-methyl polystyrene and polystyrene derivatives; bisphenols, such as bisphenol A; cycloaliphatic polyester resins, such as PCCD and its derivatives or some combination of each.

Abstract: The invention relates to transparent blends of polymers suitable for use in optical articles; the polymers contain residues of BCC and its derivatives, and have properties particularly suited for use in high density optical data storage media. The polymers further contain residues of other polymers, such as ?-methyl polystyrene and polystyrene derivatives; bisphenols, such as bisphenol A; cycloaliphatic polyester resins, such as PCCD and its derivatives or some combination of each.

Abstract: A thermoplastic molding composition especially suitable for preparing optical data carriers is disclosed. The composition contains polycarbonate resin, at least one mold release agent and at least one phosphite having a defined structural formula. The optical data carriers include compact discs, video discs, digital versatile discs and further optical data carriers which may be written and erased one or more times.

Abstract: An clear coated article formed from a transparent/translucent molding composition comprising a uniform miscible resin blend of a polycarbonate resin and a cycloaliphatic polyester resin, said cycloaliphatic polyester resin comprising the reaction product of an aliphatic C2-C20 diol or chemical equivalent and a C6-C20 aliphatic diacid or chemical equivalent, said cycloaliphatic polyester resin contains at least about 80% by weight of a cycloaliphatic dicarboxylic acid, or chemical equivalent, and/or of a cycloaliphatic diol or chemical equivalent, wherein the cycloaliphatic polyester resin and the polycarbonate resin have a viscosity selected for enhancing the adhesion of the clear coat to the article.

Abstract: A polycarbonate composition excellent in both antistatic property and coloring matter coatability containing (a) a polycarbonate obtained by an ester exchange process, and (b) a compound having a molecular weight of from 300 to 8,000 and having any of ester bond, carbonate bond, amide bond and urethane bond in its molecule and an aromatic hydrocarbon group substituted by at least one alkyl group at the molecular end thereof, a write once read many optical disc substrate and a write once read many optical disc using the same and a process for the production of a write once read many optical disc are described.

Abstract: An optical polycarbonate resin molding material comprising pellets formed from a polycarbonate resin, wherein the pellets satisfy the following properties (1) and (2): (1) an average of surface areas (hereinafter referred to as “cross sectional areas”) in cutting cross sections of the pellets is 3.0 to 6.5 mm2, and a standard deviation thereof is not larger than 0.65 mm2, and (2) an average of ratios of long diameters to short diameters (hereinafter referred to as “long diameter/short diameter”) in the cutting cross sections of the pellets is 1.3 to 1.7, and a standard deviation thereof is 0.08 to 0.15, and an optical disc substrate formed from the material. According to the present invention, when the aromatic polycarbonate resin pellets which satisfy the properties (1) and (2) are used for molding, an optical disc substrate which hardly undergoes occurrence of silver streaks can be obtained, and operations at the time of molding can be facilitated.

Abstract: An optical information medium comprises a supporting substrate 20, an information recording surface 4 on the supporting substrate 20 and a light-transmitting layer 2 on the information recording surface 4. Recording light and/or reproducing light are incident on the information recording surface 4 through the light-transmitting layer 2. The light-transmitting layer 2 comprises a light-transmitting sheet 201 formed of a resin such as polycarbonate, cyclic polyolefin and polyarylate and an adhesive layer 202 for bonding the light-transmitting sheet 201 to an associated side of the supporting substrate.

Abstract: A ridgy resin film made of a resin is formed. On a flat substrate, a first concave and a second concave are formed such as to be spaced a given distance apart from each other. Then, a resin liquid is supplied onto a land being part of the substrate exposed between the first and second concaves. Due to its surface tension, the resin liquid supplied onto the land bulges, and a ridgy resin film even in width is formed by curing the resin liquid in this state. Along the edges of the openings of the first concave and the second concave, ridges are formed. Since the resin liquid is supplied onto the land between the ridges, it does not drip nor overflow.

Abstract: An active energy ray-curing adhesive composition is provided that has high curing rate as well as excellent adhesion and bonding workability, and a keypad (11) for push-button switches that has not only high bonding rate of a hard resin keytop (20) to a base portion (12) but also has excellent adhesion and excellent bonding workability in the bonding step. The active energy ray-curing adhesive composition includes a urethane (meth) acrylate, a (meth)acrylamide compound, and a hydroxyl group-containing (meth)acrylate. Optionally, the composition may further contain particulate silicic anhydride, and at least one of a tertiary amine salt and a tertiary amine. In the keypad (11) for push-button switches, the hard resin keytop (20) is fixed to the base portion (12) made of a rubbery elastic material through an adhesive layer (19) made of the adhesive composition.

Abstract: The present invention relates to a polycarbonate resin that has a viscosity average molecular weight of from 10,000 to 17,000 and has characteristic features in an iron content, a free total phenol content, a content of a releasing agent, a fraction of hydroxyl end groups, a 1H-NMR spectrum or the like. The polycarbonate resin has less defects due to flash without increase of an addition amount of a releasing agent to an unnecessary level and therefore is suitable for a material of an optical disk substrate.

Abstract: A method for producing polycarbonate based on 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethyl cyclohexanone and 4,4-(metaphenylene diisopropyl) diphenol is disclosed. The method is characterized in that the recovery and/or further processing of the polycarbonate is performed at temperatures below 290° C. The polycarbonate thus produced has high purity and high transmission and is suitable for the manufacture of optical data stores.

Abstract: A thermoplastic composition is described, based on a copolycarbonate which includes at least two structural units. Structure I is usually a conventional carbonate based on bisphenol A, while structure II is a bisphenol carbonate which includes branched or linear groups extending from a bridging carbon atom or carbon group which connects two aromatic rings. The compositions exhibit very good melt flow, along with enhanced shear-thinning behavior. These characteristics are important for optical disc applications. Thus, related articles are described, along with processes for preparing such articles.

Abstract: An optical disk, which comprises: a common integral substrate having grooves and/or pits formed on its both sides: and a film structure on at least one side of the integral substrate. They are manufactured by preparing two stampers; simultaneously forming grooves and pits on both sides of an integral substrate by use of said two stampers mounted on a respective fixed mold and moving mold; and forming the film structure on at least one side of said integral substrate by depositing material from targets suspended to both sides of said integral substrate. The disks are superior in mechanical properties and reliability. As for reliability, the present optical disk is prepared without using a bonding process, which overcomes the problem of adhesive out-flow.

Abstract: An optical disc has a support base and at least one information-retrieval layer formed over the support base. The information-retrieval layer is transparent and thinner than the support base. The information-retrieval layer exhibits variation in birefringence within ±20 nmpp (nano meter peak to peak) under double-pass measurements during one rotation of the optical disc.

Abstract: A manufacturing method of a multi-layer optical information record carrier, which has a plurality of layers of reflecting surfaces with pits for recording information. According to the method, a reflective layer is first coated on a stamper with a pit pattern. A radiation-setting adhesive polymer resin is then applied on a substrate with another pit pattern and coated with a partial reflective layer. The substrate and the stamper are combined together and the resin is cured by ultraviolet light. After peeling off the stamper, two reflective layers are formed on the substrate. Finally, two of the substrates are adhered together using polymer resin and one obtains a multi-layer optical information record carrier with dual information layers on both sides.

Abstract: An organic substrate having optically-active layers deposited by magnetron sputtering and a preparation process for it are provided. Gas pressure used for carrying out better adhesion by sputtering is high, comprised between 0.8 and 5.0 Pa. Sputtering is particularly suitable for targets of Si, Ti, Zr and organic substrates with or without anti-abrasive coating. Improved adhesion of thin films is obtained.

Abstract: The invention relates to transparent blends of polymers suitable for use in optical articles; the polymers contain residues of BCC and its derivatives, and have properties particularly suited for use in high density optical data storage media. The polymers further contain residues of other polymers, such as &agr;-methyl polystyrene and polystyrene derivatives; bisphenols, such as bisphenol A; cycloaliphatic polyester resins, such as PCCD and its derivatives or some combination of each.

Abstract: Optical disks comprise a substrate, a metallized layer and a coating formed from a radiation-curable composition. The radiation-curable composition comprises a first component selected from the group consisting of alkanediol diacrylates, alkanediol dimethacrylates, alkene glycol diacrylates, alkene glycol dimethacrylates, and mixture thereof, and a second component comprising an acrylate- or methacrylate-containing alkoxylated bisphenol A compound. The compositions further include a photoinitiator and an adhesion promoter for promoting adhesion of the coating to the metallized substrate.

Abstract: The present invention provides a composition comprising polycarbonate wherein the polycarbonate has a very low Fries content (e.g., above 5 ppm and below 360 ppm). The present invention also provides a polycarbonate having a very low Fries content which is made by the melt process. This polycarbonate has high ductility and high impact strength. The invention also provides a method for making these compositions. Another aspect of the invention is an optical disk comprising polycarbonate having a very low Fries content which is made by the melt process. Such optical disks resist breakage due to bending.

Abstract: Polymer blends suitable for use in optical article. The polymer blends comprise a first and second polycarbonate and have properties particularly suited for use in high density optical data storage media.

Abstract: The damping performance of an article and a polycarbonate composition is improved and a storage medium for data is provided with a glass transition temperature greater than about 150° C.

Abstract: A method for determining the water strain of an article is provided in the present invention by predetermining a maximum tilt range and radius for the article. Further embodiments of the present invention include a storage medium for data and a polymer for use in a storage medium for data where the storage medium comprises a plurality of layers wherein the aforementioned water strain is calculated for the plurality of layers.

Abstract: A photocurable resin composition which comprises (A) a urethane (meth)acrylate oligomer obtained by the reaction of (a) at least one polyol compound preferably selected from the group consisting of polyester polyols and polycarbonate polyols, (b) a polyisocyanate compound, and (c) a hydroxyl group-containing (meth)acrylate compound; (B) a (meth)acrylolylphosphate; (C) a multifunctional (meth)acrylate compound; and (D) a photopolymerization initiator and, optionally, (E) an organosilyl-containing mercapto compound. The composition exhibits a fast cure speed, and the cured products obtained from the composition exhibit superior adhesion under high temperature-high humidity conditions and metal corrosion properties.

Abstract: A transparent coating is used on an optical information disk. The optical information disk is an injection-molded piece of clear poly-carbonate plastic and is impressed with microscopic bumps which are arranged as a single, continuous, extremely long spiral track of data. A thin, reflective aluminum layer is sputtered onto the optical information disc so that the thin, reflective aluminum layer covers the bumps. A thin acrylic layer is sprayed over the thin, reflective aluminum layer in order to protect it. The transparent coating is a composite material which is made of silica as the discontinuous phase and of a polytetrafluoro-ethylene-derived organic polymer as the continuous phase which leads to a fluorine-containing silica-based product. The transparent coating is applied by spin or dip from specific solutions at room temperature followed by a mild and short heat treatment.

Abstract: The present invention relates to a composition comprising a first monomer having the formula CH2═CHCOOR1, where R1 is a linear alkyl group having from 9 to 16 carbon atoms or a branched alkyl group having from 9 to 30 carbon atoms, and whose homopolymer has a Tg less than 0° C.; and/or a second monomer having the formula CH2═CHCOOR2, where R2 is an alkyl group having at least 9 carbon atoms whose homopolymer has a Tg greater than 15° C.; and a third component which may be another monomer, a polymer, surface-modified particles, or combinations thereof as well as article comprising the composition.

Abstract: The invention relates to terpolymers particularly suited for use in high density optical data storage media. The terpolymers are suitable for use in DVD recordable and rewritable media. The invention further relates to methods for making DVD recordable and rewritable media from these terpolymers.

Abstract: The present invention relates to a substrate for information recording media, which comprises aromatic polycarbonate resin composition comprising: 100 parts by weight of an aromatic polycarbonate resin having a viscosity-average molecular weight of 10,000 to 40,000, and 0.01 to 40 parts by weight of a biphenyl compound, a terphenyl compound or a mixture thereof.

Abstract: Cards which contain any one of the following thermoplastic resin compositions I to III in its material can be used as magnetic cards, IC cards, etc. since they are excellent in heat resistance, processability and embossability: a composition consisting of ingredients (A) and (B); a composition consisting of ingredients (A), (B) and (D); and a composition consisting of 100 parts by weight of one or more selected from the following ingredients (A), (B) and (D) and 2 to 25 parts by weight of the following ingredient (C), wherein ingredient (A) is a polyester composed of dicarboxylic acid components with terephthalic acid component as a main dicarboxylic acid component and ethylene glycol component (I) and 1,4-cyclohexanedimethanol component (II) as main glycol components, wherein the molar ratio (I)/(II) of ethylene glycol component (I) to 1,4-cyclohexanedimethanol component (II) is 1 or more; ingredient (B) is an aromatic polycarbonate; ingredient (C) is an inorganic sheet-like filler of 0.

Abstract: Disclosed is an article for the optical storage of data having low birefringence prepared from a mixture of a polycarbonate and a cycloaliphatic polyester. The article may optionally have stabilization and mold release additives that retain transparency, color and processability.

Abstract: A recording disk comprises a substrate including a plastic material, and an overlay arranged over the substrate and including a recording substance for recording therein an information, and a radially-outer periphery of the overlay is received within a radially-outer periphery of the substrate as seen in an axial direction of the recording disk.

Abstract: An improved method and apparatus for making a dual-layer DVD disc that does not require a stamping step (typically, as part of the 2P prior art manufacturing process) during its manufacture. As proposed by Mueller, a polycarbonate substrate is molded and coated with a semireflective data layer in the usual way. A PMMA substrate is molded and coated with a fully reflective data layer. Adhesive is placed on the semireflective data layer, and the fully reflective data layer is transferred from its PMMA substrate to the polycarbonate substrate. The polycarbonate substrate thus ends up with two data layers in conformance with the DVD specifications, and the PMMA substrate can even be recycled for another use. However, instead of using a PMMA substrate that is larger than the polycarbonate substrate as proposed by Mueller, in the invention they have equal diameters. This allows conventional molding equipment to be used with no major changes.

Abstract: A photopolymerizable composition comprising (A) 100 parts by weight of a mixture of (meth)acrylic acid ester monomers, (B) from 0.1 to 5 parts by weight of a surfactant having a perfluoroalkyl group and represented by the general formula (1) CF3(CF2)nAM  (1) wherein A represents —CO2— or —SO3—, M represents an alkali metal, and n is an integer of 3 to 9, and (C) from 0.2 to 10 parts by weight of a photopolymerization initiator, and a plastic optical disk provided with a cured coating of the photopolymerizable composition on at least one side thereof.

Abstract: An ultraviolet-curable adhesive composition comprising a photopolymerization initiator whose molar absorption coefficient at a wavelength of 360-450 nm is at least 400 and an ultraviolet-curable compound. The adhesive composition of this invention can bond substrates which show transmittances of 0.01-20% to all of energy beams of a wavelength of 280-380 nm, to one another.

Abstract: The present invention provides a label for optical disks which comprises a base sheet having a coefficient of linear expansion of 1.0×10−5 to 12.0×10−5 and a thermal shrinkage ratio of 3 or below percent, a display formed on at least one surface of the base sheet, and an adhesive layer formed on a surface of the base sheet or the display. The label for optical disks can be applied on the surface of the optical disk with displays such as various printings and pholograms, and can provides an optical disk having beauty and fineness in aesthetic.

Abstract: An optical data recording medium in which the shape of the dye spectrum of a dye film having a thin film thickness per unit absorbance is controlled so as to enable improvements in the recording speed during high speed recording, jitter, and modulation, wherein the optical data recording medium is characterized in that 0<D/C≦100, and 80≦D/B, where D (nm) is the mean film thickness of the light-absorbing layer, C (Abs) is the maximum absorbance (based on molecular absorption) of the light-absorbing substance, B (Abs) is the maximum absorbance (based on association absorption) of the light-absorbing substance, D/C is the unit absorbance thickness based on the molecular absorption, and D/B is the unit absorbance thickness based on the association absorption.

Abstract: An optical disk for recording/reproducing information have the problem of the fine irregularities on its substrate surface that causes increase of noise, under the process of forming the recording layer capable of changing physically or chemically by irradiation of laser light. The problem could deteriorate the record and reproduction characteristics and bring about a defect on a life test or on its storage ability. To solve the problem, the present invention provides the method of manufacturing an optical disk having the pits-and-lands pattern whose organic material is modified by the ultraviolet light irradiation. The transmission of the substrate is not more than 50% at one wavelength in a wavelength region from 300 to 375 nm. And, thereby the surface of an optical disk substrate is smoothed to effect the reduction of the substrate noise and the improvement of record and reproduction characteristics.

Abstract: A perishable media information storage mechanism, including a substrate, a data layer for recording data thereon the information storage mechanism, a reflective layer, and a protective lacquer coating. The data layer includes a material responsive to at least one predetermined data elimination factor and includes one of a decayable dye material, a liquid crystal material, a photosensitive material or a plurality of magnetoresistive memory cells. The data layer is characterized as recording data and eliminating access to data in response to at least one of a predetermined use or time factor. In addition, included is a method for fabricating a perishable media information storage mechanism including the steps of providing a substrate, forming a data layer on a surface of the substrate, forming a reflective layer on an uppermost surface of the data layer, and forming a protective coating on an uppermost surface of the reflective layer.

Abstract: Disclosed is an article for the optical storage of data having low birefringence prepared from a mixture of a polycarbonate and a cycloaliphatic polyester. The article may optionally have stabilization and mold release additives that retain transparency, color and processability.

Abstract: A digital video disk substrate of a polycarbonate having a viscosity average molecular weight (Mv) of 10,000 to 17,000 and a weight average molecular weight (Mw)/number average molecular weight (Mn) of not smaller than 2.3, and a digital video disk substrate of a polycarbonate having a viscosity average molecular weight (Mv) of 1,000 to 17,000 obtained by the transesterification of a divalent phenol such as 2,2-bis(4-hydroxyphenyl) propane with a carbonic acid diester such as diphenyl carbonate. The digital video disk substrate is little cracked at the time of molding, and exhibits small birefringence and excellent transcriptional property.