WO2007067800A2 - Support de stockage et procede associe - Google Patents
Support de stockage et procede associe Download PDFInfo
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- WO2007067800A2 WO2007067800A2 PCT/US2006/047159 US2006047159W WO2007067800A2 WO 2007067800 A2 WO2007067800 A2 WO 2007067800A2 US 2006047159 W US2006047159 W US 2006047159W WO 2007067800 A2 WO2007067800 A2 WO 2007067800A2
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- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002102 polyvinyl toluene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000012763 reinforcing filler Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- GDESWOTWNNGOMW-UHFFFAOYSA-N resorcinol monobenzoate Chemical compound OC1=CC=CC(OC(=O)C=2C=CC=CC=2)=C1 GDESWOTWNNGOMW-UHFFFAOYSA-N 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- ILMRJRBKQSSXGY-UHFFFAOYSA-N tert-butyl(dimethyl)silicon Chemical group C[Si](C)C(C)(C)C ILMRJRBKQSSXGY-UHFFFAOYSA-N 0.000 description 1
- 238000003878 thermal aging Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 125000002813 thiocarbonyl group Chemical group *C(*)=S 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 150000003573 thiols Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229920000428 triblock copolymer Polymers 0.000 description 1
- 125000003866 trichloromethyl group Chemical group ClC(Cl)(Cl)* 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- ORGHESHFQPYLAO-UHFFFAOYSA-N vinyl radical Chemical compound C=[CH] ORGHESHFQPYLAO-UHFFFAOYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
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Definitions
- the invention may include embodiments that relate to an optical data storage medium.
- the invention may also include embodiments that relate to a method of making and using an optical data storage medium having a data layer and a curable hard coat layer.
- An increase in data storage density in optical data storage media may be desirable to improve data storage technologies, such as, read-only media, write-once media, rewritable media, digital versatile disks (DVD), digital video recorders (DVR) and magneto- optical (MO) media.
- data storage technologies such as, read-only media, write-once media, rewritable media, digital versatile disks (DVD), digital video recorders (DVR) and magneto- optical (MO) media.
- DVR digital video recording
- BLU-RAY DISC digital video recording
- DVR disk assemblies may include a data storage layer metallized onto a substrate and may be covered by an optical layer via a clear adhesive. Short reading and writing wavelengths may involve stringent design requirements for one or both of the optical layer and the substrate layer of the DVR disk assemblies.
- Design requirements for the material used in optical data storage media may include one or more of dimensional stability, disk flatness (e.g., tilt), water strain, low birefringence, high transparency, heat resistance, ductility, high purity, or medium homogeneity (e.g., particulate concentration).
- an optical data storage medium may include a data layer and a curable hard coat layer secured to the surface of the data layer.
- the data layer may be read, written to, or both read and written to using a laser having a wavelength of less than about 650 nanometers.
- an optical data storage medium may include a data layer and a hard coat layer secured directly to a surface of the data layer.
- the hard coat layer may include a radiation curable or a thermally curable silicone composition and may have an average thickness in a range of greater than about 80 micrometers.
- the data layer may be read, written to, or both read and written to using a laser having a wavelength of less than about 420 nanometers.
- One embodiment may provide a method for securing a curable hard coat layer directly to a data layer and curing the hard coat layer.
- FIG. 1 is a cross-section of an optical data storage medium.
- FIG. 2 is a cross-section of an optical data storage medium.
- FIG. 3 is a cross-section of an optical data storage medium.
- FIG. 4 is a plot of scratch area as a function of applied normal force for optical data storage media.
- FIG. 5 is a plot of radial tilt change values at humidity of 90 percent over a period of time for optical data storage media.
- the invention may include embodiments that relate to an optical data storage medium.
- the optical data storage medium may have a data layer and a curable hard coat layer secured to the surface of the data layer.
- the invention may include embodiments that relate to a method of making and of using an optical data storage medium having a data layer and a curable hard coat layer.
- An optical data storage medium may include a data layer and a curable hard coat layer secured to the surface of the data layer.
- the data layer may be read, written to, or both read and written to using a laser.
- the data layer may function as an information or data-recording layer.
- the hard coat layer may function as the surface upon which the laser beam for recording or reproducing information or data is incident.
- the laser beam may be incident through the hard coat layer and other layers (if present) onto the data layer.
- the cured hard coat layer may improve one or more of dimensional stability, disk flatness (e.g., tilt), water strain, low birefringence, high transparency, heat resistance, and ductility of the optical storage medium.
- the curable hard coat layer in one embodiment may include a thermally curable composition or a radiation curable composition.
- a thermally curable composition may include one or more of a siloxane, a melamine polyol, a urethane, an acrylate, an imide, or a combination of two or more thereof.
- the hard coat layer may include a silicone resin.
- the hard coat layer may further include a catalyst.
- the radiation used to cure the hard-coat layer may include one or more' of ultra-violet radiation, electron-beam radiation, corona radiation or plasma.
- a radiation curable composition may include one or more of an acrylate, a urethane, an oxirane, a siloxane, or a combination of two or more thereof.
- the acrylate may be monomeric or polymeric and may be derived from one or more of an acrylic or a methacrylic monomer.
- the hard coat layer may include a silicon-containing polyacrylate hard coat.
- the hard coat layer may further include a photoinitiator.
- the hard coat layer may be free of a polycarbonate.
- the hard coat layer may include one or more additives.
- the additives may include one or more of flow control agents, modifiers, carrier solvents, viscosity modifiers, adhesion promoters, ultra-violet absorbers, or reinforcing fillers.
- Suitable fillers may include metal compounds. Suitable metal compounds may include metal oxides, metal hydroxides, metal nitrides, mixed metal oxides, mixed metal nitrides, metal oxynitrides, mixed metal oxynitrides or a combination of two or more thereof. Suitable metal oxides or hydroxides may include one or more oxides, hydroxides, nitrides or oxynitrides of aluminum, magnesium, calcium, barium, boron, iron, zinc, zirconium, chromium, silicon, or titanium. In one embodiment, aluminum oxide (alumina) or hydroxide may be used as filler.
- the filler may include one or more of synthetic silicate, natural silicate, or glass fiber. Suitable examples of natural silicates may include kaolin, clay, or talc. Suitable examples of synthetic silicates may include aluminum silicate, magnesium silicate, calcium silicate, or combinations thereof.
- the filler may include one or more of a partially or fully condensed polyhedral oligosilsesquioxane (POSS). In one embodiment, the filler may include a fully condensed polyhedral oligosilsesquioxane, having formula (I);
- n is an even integer from 2 to 100; and R 1 is independently at each occurrence a hydrogen atom, an aliphatic radical, n aromatic radical, or a cycloaliphatic radical.
- Aliphatic radical, cycloaliphatic radical and aromatic radical may be defined as the following:
- Aliphatic radical may be an organic radical having at least one carbon atom, a valence of at least one and may be a linear array of atoms. Aliphatic radicals may include heteroatoms such as nitrogen, sulfur, silicon, selenium and oxygen or may be composed exclusively of carbon and hydrogen. Aliphatic radical may include a wide range of functional groups such as alkyl groups, alkenyl groups, alkynyl groups, halo alkyl groups, conjugated dienyl groups, alcohol groups, ether groups, aldehyde groups, ketone groups, carboxylic acid groups, acyl groups (for example, carboxylic acid derivatives such as esters and amides), amine groups, nitro groups and the like.
- functional groups such as alkyl groups, alkenyl groups, alkynyl groups, halo alkyl groups, conjugated dienyl groups, alcohol groups, ether groups, aldehyde groups, ketone groups, carboxylic acid groups, acyl groups (for example, carboxy
- the 4-methylpent-l-yl radical may be a C$ aliphatic radical comprising a methyl group, the methyl group being a functional group, which may be an alkyl group.
- the 4-nitrobut-l-yl group may be a C 4 aliphatic radical comprising a nitro group, the nitro group being a functional group.
- An aliphatic radical may be a haloalkyl group that may include one or more halogen atoms, which may be the same or different. Halogen atoms include, for example; fluorine, chlorine, bromine, and iodine.
- Aliphatic radicals having one or more halogen atoms may include the alkyl halides: trifluoromethyl, bromodifluoromethyl, chlorodifluoromethyl,
- hexafluoroisopropylidene chloromethyl, difluorovinylidene, trichloromethyl, bromodichloromethyl, bromoethyl, 2-bromotrimethylene (e.g., -CHsCHBrCH 2 -), and the like.
- aliphatic radicals may include allyl, aminocarbonyl (— CONH 2 ), carbonyl, dicyanoisopropylidene -CH 2 C(CN) 2 CH 2 -), methyl (-CH 3 ), methylene (-CH 2 -), ethyl, ethylene, formyl (-CHO), hexyl, hexamethylene, hydroxymethyl (-CH 2 OH), mercaptomethyl (-CH 2 SH), methylthio (-SCH 3 ), methylthiomethyl (-CH 2 SCH 3 ), methoxy, methoxycarbonyl (CH 3 OCO-) , nitromethyl (-CH 2 NO 2 ), thiocarbonyl, trimethylsilyl ((CH 3 ) 3 Si-), t-butyldimethylsilyl,
- trimethoxysilylpropyl (CH 3 O) 3 SiCH 2 CH 2 CH 2 -), vinyl, vinylidene, and the like.
- a "Ci - C 3 o aliphatic radical” contains at least one but no more than 30 carbon atoms.
- a methyl group (CH 3 -) may be an example of a Ci aliphatic radical.
- a decyl group (CH 3 (CH 2 ) 9 -) may be an example of a C 10 aliphatic radical.
- a cycloaliphatic radical may be a radical having a valence of at least one, and having an array of atoms, which may be cyclic but which may not be aromatic.
- cycloaliphatic radical may include one or more non-cyclic components.
- a cyclohexylmethyl group (CeHi 1 CH 2 -) may be a cycloaliphatic radical, which may include a cyclohexyl ring (the array of atoms, which may be cyclic but which may not be aromatic) and a methylene group (the noncyclic component).
- the cycloaliphatic radical may include heteroatoms such as nitrogen, sulfur, selenium, silicon and oxygen, or may be composed exclusively of carbon and hydrogen.
- a cycloaliphatic radical may include one or more functional groups, such as alkyl groups, alkenyl groups, alkynyl groups, halo alkyl groups, conjugated dienyl groups, alcohol groups, ether groups, aldehyde groups, ketone groups, carboxylic acid groups, acyl groups (for example carboxylic acid derivatives such as esters and amides), amine groups, nitro groups and the like.
- the 4-methylcyclopent-l-yl radical may be a Ce cycloaliphatic radical comprising a methyl group, the methyl group being a functional group, which may be an alkyl group.
- the 2-nitrocycIobut-l-yl radical may be a C 4 cycloaliphatic radical comprising a nitro group, the nitro group being a functional group.
- a cycloaliphatic radical may include one or more halogen atoms, which may be the same or different. Halogen atoms include, for example, fluorine, chlorine, bromine, and iodine. Cycloaliphatic radicals having one or more halogen atoms may include 2-trifIuoromethyIcycIohex-l-yl, 4- bromodifluoromethylcyclooct-1-yl, 2-chlorodifluoromethylcyclohex-l-yl,
- cycloaliphatic radicals may include 4-allyloxycyclohex-l-yl, 4-aminocyclohex-l-yl (H 2 NC 6 HiO-), 4- aminocarbonylcyclopent-1-yl (NH 2 COC 5 H 8 -), 4-acetyloxycyclohex-l-yl, 2,2- dicyanoisopropylidenebis(cyclohex-4-yloxy) (-OCgHi O C(CN) 2 CsHi O O-), 3- methylcyclohex-1-yl, methylenebis(cyclohex-4-yloxy) (-OC 6 Hi O CHbC 6 Hi O O-), 1- ethylcyclobut-1-yl, cyclopropylethenyl, 3-formyl-2-terahydrofuranyl, 2-hexyl-5- tetrahydrofuranyl; hexamethylene-l,6-bis(
- a C 3 — C 30 cycloaliphatic radical may include cycloaliphatic radicals containing at least three but no more than 10 carbon atoms.
- the cycloaliphatic radical 2-tetrahydrofuranyl (C 4 H 7 O-) represents a C 4 cycloaliphatic radical.
- the cyclohexylmethyl radical (C 6 Hi 1 CH 2 -) represents a C 7 cycloaliphatic radical.
- An aromatic radical may be an array of atoms having a valence of at least one and having at least one aromatic group. This may include heteroatoms such as nitrogen, sulfur, selenium, silicon and oxygen, or may be composed exclusively of carbon and hydrogen. Suitable aromatic radicals may include phenyl, pyridyl, furanyl, thienyl, naphthyl, phenylene, and biphenyl radicals.
- the aromatic radical also may include non-aromatic components.
- a benzyl group may be an aromatic radical, which may include a phenyl ring (the aromatic group) and a methylene group (the non-aromatic component).
- a tetrahydronaphthyl radical may be an aromatic radical comprising an aromatic group (CeHb) fused to a non-aromatic component -(CHz)A--
- An aromatic radical may include one or more functional groups, such as alkyl groups, alkenyl groups, alkynyl groups, haloalkyl groups, haloaromatic groups, conjugated dienyl groups, alcohol groups, ether groups, aldehyde groups, ketone groups, carboxylic acid groups, acyl groups (for example carboxylic acid derivatives such as esters and amides), amine groups, nitro groups, and the like.
- the 4-methyl phenyl radical may be a C 7 aromatic radical comprising a methyl group, the methyl group being a functional group, which may be an alkyl group.
- the 2-nitrophenyl group may be a C 6 aromatic radical comprising a nitro group, the nitro group being a functional group.
- Aromatic radicals include halogenated aromatic radicals such as trifluoromethylphenyl, hexafluoroisopropylidenebis(4-phen-l-yloxy) (—
- aromatic radicals may include 4-allyloxyphen-l-oxy, 4-aminophen-l-yl (H 2 NPh-), 3-aminocarbonylphen-l-yl (NH 2 COPh-), 4-benzoylphen-l-yl, dicyanoisopropylidenebis (4-phen-l-yloxy) (- OPhC(CN) 2 PhO-), 3-methylphen-l-yl, methylenebis(phen-4-yloxy) (-OPhCH 2 PhO-), 2-ethylphen-l-yl, phenylethenyl, 3-formyl-2-thienyl, 2-hexyl-5-furanyl;
- a C 3 - C 30 aromatic radical may include aromatic radicals containing at least three but no more than 30 carbon atoms.
- a suitable C 3 aromatic radical may include 1-imidazolyl (C 3 H 2 Na-).
- the benzyl radical (C 7 H 7 -) represents a C 7 aromatic radical.
- the fully condensed polyhedral oligosilsesqu ⁇ oxane (I) may include at least one of methyl silsesquioxane, phenyl silsesquioxane, phenylethyl silsesquioxane, or polyphenylsilsesquioxane.
- Methyl silsesquioxane exemplifies silsesquioxane of formula (I), wherein R 1 is a methyl radical.
- Phenyl silsesquioxane exemplifies silsesquioxane of formula (I), wherein R 1 is a phenyl radical.
- Phenylethyl silsesquioxane exemplifies silsesquioxane of formula (I), wherein R 1 is a phenylethyl radical.
- Phenyl polysilsesquioxane exemplifies silsesquioxane of formula (I), wherein R 3 is a phenyl radical and "n" is greater than 20.
- the fully condensed polyhedral oligosilsesquioxane may include fully condensed polyhedral oligosilsesquioxane (POSS) frameworks comprising 6, 8, 10, or 12 Si atoms.
- the silsesquioxane framework may be built upon Si-O linkages and clusters.
- Some of the fully condensed polyhedral oligosilsesquioxane (POSS) frameworks exemplifying embodiments of the invention may include silsesquioxanes of formulae (II), (III), or (IV);
- R 2 , R 3 and R 4 are independently at each occurrence a hydrogen atom, an aliphatic radical, an aromatic radical, or a cycloaliphatic radical.
- the inorganic filler may include a partially condensed polyhedral oligosilsesquioxane (POSS) having formula(V);
- PES polyhedral oligosilsesquioxane
- Formula (V) falls within general formula (I) and represents a special case wherein n is an even integer from 2 to 100 and m is 0.
- the partially condensed polyhedral oligosilsesquioxane (POSS) framework may include 4 to 12 Si atoms.
- the silsesquioxane framework may be built upon Si-O linkages and clusters.
- Some of the partially condensed polyhedral oligosilsesquioxane (POSS) frameworks exemplifying embodiments of the invention may include silsesquioxanes of formulae (VI), (VII), (VIII), or (IX);
- R 6 , R 7 , R 8 and R 9 are independently at each occurrence a hydrogen atom, an aliphatic radical, an aromatic radical, or a cycloaliphatic radical.
- Silsesquioxanes may be available commercially from Aldrich Chemical Co, Gelest Inc., or may be produced by base-catalyzed hydrolysis and condensation of alkyltrihalosilanes or alkyltrialkoxysilanes.
- silicon dioxide (silica) or hydroxide may be used as filler.
- the silica used may include precipitated silica, or pyrogenic silica.
- the silica may be colloidal silica.
- the inorganic filler may be modified at the surface with one or more of organo-silanes, organosilazanes, organo- titanates, organo-zirconates, betadiketones, carboxylic acids (e.g. citric acid), carboxylic acid salts (e.g. sodium citrate), thiols, or amines.
- the hard coat may include compatibilized and functionalized silica.
- a filler of silica may be treated with at least one organoalkoxysilane and at least one organosilazane.
- the two-component treatment may be done sequentially or may be done simultaneously.
- the organoalkoxysilane may be applied or reacted with at least a portion of active termination sites on the surface of the filler, and the organosilazane may be applied or reacted with at least a portion of the active termination sites that may remain after the reaction with the organoalkoxysilane.
- Organoalkoxysilanes used to functionalize the colloidal silica may be included within the formula (X): where R 10 may be independently at each occurrence an aliphatic radical, an aromatic radical, or a cycloaliphatic radical., optionally further functionalized with alkyl acrylate, alkyl methacrylate or an epoxide group, R 1 1 may be a hydrogen atom, an aliphatic radical, an aromatic radical, or a cycloaliphatic radical and "a" may be a whole number equal to 1 to 3 inclusive.
- the organoalkoxysilanes may include one or more of phenyl trimethoxy silane, 2- (3,4- epoxy cyclohexyl) ethyl trimethoxy silane, 3- glycidoxy propyl trimethoxy silane, or methacryloxy propyl trimethoxy silane.
- phase compatible filler may be passivated by the capping of the active termination sites by a passivator or a passivating agent such as an organosilazane.
- organosilazanes may include one or more of hexamethyl disilazane ("HMDZ"), tetramethyl disilazane, divinyl tetramethyl disilazane, or diphenyl tetramethyl disilazane.
- the phase compatible, passivated filler may be admixed with a hard coat composition, and may form a stable filled hard coat system.
- the organoalkoxysilane and the organosilazane are examples of a phase compatibilizer and a passivator, respectively.
- the hard coat layer may include an additive.
- An average particle size of the filler may be selected such that the hard coat layer may be substantially transparent.
- Substantially transparent may mean that a test sample of the hard coat material having a thickness of about 0.5 micrometer allows approximately 80 percent of incident electromagnetic radiation having wavelength in the range from about 290 nanometers to about 1200 nanometers at an incident angle less than about 10 degrees to be transmitted through the sample.
- the hard coat may include an additive that may have a particle size less than about 100 nanometers.
- the hard coat may include an additive that may have a particle size in a range of from about 0.5 nanometers to about 2.5 nanometers, from about 2.5 nanometers to about 10 nanometers, from about 10 nanometers to about 50 nanometers, or from about 50 nanometers to about 100 nanometers.
- the hard coat may include an additive that may have a particle size less than about 0.5 nanometers.
- the thickness of the hard coat layer may vary depending upon the additional layers used as discussed later.
- the hard coat layer may include a thermally curable composition including a colloidal silica-filled-further curable organopolysiloxane composition.
- the composition may include a dispersion of colloidal silica in a lower aliphatic alcohol-water solution of the partial condensate of a silanol having formula (XI);
- R 12 Si(OH) 3 wherein R 12 may be an aliphatic radical.
- R 12 may be a C1-C 3 alkyl radical, a vinyl radical, a 3,3,3-trifluoropropyl radical, a gamma- glycidoxypropyl radical, or a gamma-methacryloxypropyl radical, with at least 70 percent by weight of the silanol being CH 3 Si(OH) S .
- the composition may contain from about 10 to about 50 percent by weight of solids.
- the solids may include a mixture of from about 10 to about 70 percent by weight of colloidal silica and from about 30 to about 90 percent by weight of a partial condensate of a silanol.
- the partial condensate of a silanol may be obtained, entirely from the condensation of CHsSi(OH) 3 or may include a major portion which may be obtained from the condensation of CH 3 Si(OH) B and a minor portion which may be obtained from the condensation of monoethyltrisilanol, monopropyltrisilanol, monovinyltrisilanol, mono gamma-methacryloxy- propyltrisilanol, mono gamma-glycidoxypropyltrisilanol, or mixtures thereof.
- the composition may further include an acid to provide a pH in the range form about 3.0 to about 6.0.
- the pH may be maintained in this range in order to prevent premature gellation and increase the shelf life of the silica-filled organopolysiloxane hard coat composition and to obtain optimum properties in the cured coating.
- Suitable acids may include one or both of organic acid or inorganic acids. Suitable examples of acids may include, hydrochloric, chloroacetic, acetic, citric, benzoic, formic, propionic, maleic, oxalic, or glycolic acid. The acid may be added to either the silane, which hydrolyzes to form the silanol component of the composition, or the hydrosol prior to mixing the two components.
- the trisilanol component of the hard coat composition may be generated in situ by the addition of the corresponding trialkoxysilanes to aqueous dispersions of colloidal silica.
- Suitable trialkoxysilanes may include one or more of methoxy, ethoxy, isopropoxy or t-butoxy substituents.
- Upon generation of the silanol in the acidic aqueous medium there may be condensation of the hydroxyl substituents to form— Si— O— Si— bonding. The condensation may not be complete.
- organopolysiloxane may retain an appreciable quantity of silicon-bonded hydroxyl groups, thus rendering the organopolysiloxane polymer soluble in the water-alcohol solvent.
- This soluble partial condensate may be characterized as a siloxanol polymer having at least one silicon-bonded hydroxyl group per every three— SiO— units.
- the residual hydroxyl groups may condense to form a silsesquioxane, R I2 Si ⁇ 3/2 .
- the silica component of the hard coat composition may be present in the form of colloidal silica.
- the particle size of the colloidal silica may be in the range from about 10 nanometers to about 30 nanometers.
- the silica-filled organopolysiloxane hard coat compositions may be prepared by adding trialkoxysilanes to colloidal silica hydrosol and adjusting the pH to a range of 3.0 to 6.0 by the addition of an acid.
- the acid may be added to either the silane or the silica hydrosol before the two components are mixed.
- Alcohol may be generated during the hydrolysis of the trialkoxy silanes to the tris ⁇ lanols.
- additional alcohol, water, or a water-miscible solvent may be added.
- Suitable alcohols may the lower aliphatic alcohols such as methanol, ethanol, isopropanol, t-butanol, and mixtures thereof.
- the solvent system may contain from about 20 to about 75 weight percent alcohol to ensure solubility of the siloxanol formed by the condensation of the silanol.
- a minor amount of an additional water-miscible polar solvent such as acetone or butyl cellosolve may also be added to the water-alcohol solvent system.
- Alcohol or water-alcohol solvent may be added to give a composition having solids in the range from about from about 10 weight percent to about 50 weight percent.
- the solids may include from about 10 weight percent to about 70 weight percent of colloidal silica and from about 30 weight percent to about 90 weight percent of the partial condensate of the silanol.
- the composition may be aged for a short period of time to ensure formation of the partial condensate of the silanol, that is, the siloxanol.
- This condensation may occur upon generation of the silanol in the acidic aqueous medium through the hydroxyl substituents to form Si— O— Si bonding. The condensation may not be complete, resulting in a siloxane having an appreciable quantity of silicon-bonded hydroxyl group.
- This aged, silica-filled further-curable organopolysiloxane hard coat composition may be then applied onto the data layer and then air dried to evaporate the volatile solvents from the top coat composition. Thereafter, heat may be applied to cure the hard coat.
- the residual hydroxyls of the siloxane may condense to give a silsesquioxane, R 12 SiO 3Z2 , resulting in a silica-filled cross-linked organo-polysiloxane hard coat.
- the hard coat may contain silica in the range from about from about 10 weight percent to about 70 weight percent of the total composition.
- the hard coat may contain organopolysiloxane present as the silsesquioxane, R n SiO 3/2 , in the range from about 30 weight percent to about 90 weight percent of the total composition.
- the hard coat layer may include a ultra-violet radiation curable composition.
- the ultra-violet ray radiation curable composition may include colloidal silica, hydrolysis product of silyl acrylate of formula (XII), an acrylate monomer of formula (XH), and a photo initiator.
- R 13 may be independently at each occurrence a monovalent aliphatic radical
- R l4 -R 20 may be independently at each occurrence a hydrogen atom, an aliphatic radical, an aromatic radical, or a cycloaliphatic radical
- R may be a polyvalent aliphatic radical, a polyvalent cycloaliphatic radical, or a polyvalent aromatic radical
- G may be a divalent aliphatic radical
- "b” may be a whole number equal to 0 to 2
- "c” may be an integer equal to 1 to 3 with the proviso that "b” + “c” may be equal to 4
- “d” may be an integer equal to 2 to 4.
- Colloidal silica may be present in an amount in an range from about 1 weight percent to about 60 weight percent of the total composition.
- Silyl acrylate may be present in an amount in an range from about 1 weight percent to about 50 weight percent of the total composition.
- Acrylate monomer may be present in an amount in an range from about 25 weight percent to about 90 weight percent of the total composition.
- UV photoinitiator may be present in an amount in an range from about 1 weight percent to about 5 weight percent of the total composition.
- Colloidal silica may be available in either acidic or basic form. In one embodiment an acidic form of colloidal silica may be used. Alkaline colloidal silica may also be converted to acidic colloidal silica with additions of acids such as hydrochloric acid or sulfuric acid along with high agitation.
- the hard coat composition may include only one of the polyfunctional acrylate monomers.
- the hard coat composition may include a mixture of two polyfunctional acrylate monomers, for example a diacrylate and a triacrylate.
- the ratio, by weight, of the diacrylate to the triacrylate may be in the range from about 10/90 to about 90/10.
- Suitable mixtures of diacrylate and triacrylates may include mixtures of hexanediol diacrylate with pentaerythritol triacrylate, hexanediol diacrylate with trimethylolpropane triacrylate, diethyleneglycol diacrylate with pentaerythritol triacrylate, or diethyleneglycol diacrylate with trimethylolpropane triacrylate.
- the photoinitiator may include blends of Jketone-type and hindered amine type materials.
- the weight fraction of the ketone compound to the hindered amine compound may be in the range from about 4/1 to about 1/4.
- the photocurable hard coat compositions may also contain a photosensitizing amount of photoinitiator, that is, an amount effective to effect the photocure in a non- oxidizing atmosphere, for example, nitrogen, of the coating composition.
- the amount of photoinitiator may be in a range from about 0.01 weight percent to about 10 weight percent.
- the hard coat composition may also optionally include UV absorbers or stabilizers such as resorcinol monobenzoate or 2-methyl resorcinol dibenzoate.
- stabilizers may be present in an amount, based upon the weight of the coating composition, exclusive of any additional solvent, which may optionally be present, in the range from about 0.1 weight percent to about 15 weight percent.
- the hard coat composition may be made by blending together one or more of the aqueous colloidal silica, the silyl acrylate, the polyfunctional acrylic monomer, the UV photosensitizer, and optionally any other additives.
- the silyl acrylate may be hydrolyzed in the presence of aqueous colloidal silica and a water miscible alcohol.
- the aqueous colloidal silica may be added to the silylacrylate, which has been hydrolyzed in aqueous alcohol.
- Suitable alcohols may include any water miscible alcohol, such as methanol, ethanol, propanol, butanol, ethoxyethanol, butoxyethanol, or methoxypropanol.
- aqueous colloidal silica and the silylacrylate may be combined and stirred until hydrolysis has been effected.
- the hydrolysis of the silylacrylate may be accomplished at ambient conditions, or may be effected by heating the hydrolysis mixture to reflux for a few minutes.
- the hard coat material may be available from GE Plastics, Waterford, Massachusetts under the trade name of UV HC3000, UV HC8558, UV HC8556, SHC 5020, SHC 1200, PHC 587, AS4000, AS4700, or SBC400.
- the hard coat may be available from SDC Coatings, Anaheim, California under the trade name of MPl 175UV, MPlOl, or PFl 153.
- the data storage medium may include a data layer.
- the data layer may be made of a material capable of storing retrievable data.
- the data or information which is to be stored on the data storage medium may be imprinted directly onto the surface of the data layer or may be stored in a photo-, thermal-, or magnetically-definable medium.
- the photo-, thermal-or magnetically-definable medium may be deposited onto the surface of a substrate layer to form the data layer.
- Suitable material for the data layer may include one or more of metal oxides (for example, silicone oxide), rare earth element- transition metal alloys, nickel, cobalt, chromium, tantalum, platinum, terbium, gadolinium, iron, boron, organic dyes (for example, cyanine or phthalocyanine type dyes), inorganic phase change compounds (for example, GeTeSb, TeSeSn, or InAgSb), alloys, or combinations comprising at least one of the foregoing.
- Suitable phase-change compound may include the phase-change chalcogenide alloys available from Energy Conversion Device, Inc. (ECD).
- the thickness of a data layer may be greater than about 5 nanometers. In one embodiment, the thickness of a data layer may in the range from about 5 nanometers to about 10 nanometers, from about 10 nanometers to about 25 nanometers, from about 25 nanometers to about 50 nanometers, from about 50 nanometers to about 100 nanometers. In one embodiment, the thickness of a data layer may be greater than about 100 nanometers.
- the data storage layer may be applied to the disk substrate by a sputtering process, electroplating, coating techniques (spin coating, spray coating, vapor deposition, screen printing, painting, dipping, sputtering, vacuum deposition, electrodeposition, meniscus coating), or combinations thereof.
- High areal densities may correspond to high data storage capabilities. Areal density may be increased by one or more of adding extra information layers or decreasing the laser beam spot diameter (i.e., the diameter of the laser light beam that strikes the media).
- the laser beam spot diameter may be approximately the wavelength of the laser light divided by the numerical aperture (NA) of the objective lens.
- NA numerical aperture
- the numerical aperture may be the measure of the light-gathering capacity of the lens system.
- the laser beam spot diameter may be decreased by one or more of decreasing the wavelength of the laser or increasing the NA of the objective lens.
- BLU-RAY DISC technology may be one example of a high areal density storage medium using a blue laser, also known as a blue-violet laser, having a 405 nanometers wavelength. In comparison, the wavelength of the laser used to read CDs is 780 nanometers.
- the data layer of the optical data storage medium may be read, written to, or both read and written to using a laser having a wavelength of less than about 650 nanometers. In one embodiment, the data layer of the optical data storage medium may be read, written to, or both read and written to using a laser having a wavelength of less than about 420 nanometers. In one embodiment, the data layer of the optical data storage medium may be read, written to, or both read and written to using a laser having a wavelength of about 405 nanometers.
- the hard coat layer may be transmissive to the laser beam and/or may interact with the laser beam to allow the data layer to be read, written to or both read and written to using a laser beam.
- the optical and physical characteristics of the hard coat layer that allow the data layer to be read, written to or both read and written to using a laser having a wavelength less than about 650 nanometers may be very different from that of a hard coat layer that allow the data layer to be read, written to or both read and written to using a laser having a wavelength less than about 420 nanometers.
- the NA of the objective lens of the laser beam source used to read, write to, or both read or write to the data layer is greater than about 0.60. In one embodiment, the NA of the objective lens of the laser beam source used to read, write to, or both read or write to the data layer is about 0.85.
- an optical data storage medium may include a plurality of polymeric and/or metallic components, which may be combined in overlaying horizontal layers of various thicknesses, depending on the specific properties and requirements of the particular application of the optical data storage medium.
- the optical data storage medium may include a hard coat layer directly in contact with a data layer.
- the data layer may be further secured to a substrate layer.
- the substrate layer may function as a supporting layer for the data layer and may provide rigidity to the optical storage medium.
- an optical data storage medium 10 may include a hard coat layer 20 directly secured to a data layer 30, which may be secured to substrate layer 40.
- the substrate layer may be made of a polymeric material, which may include one or both of a thermoplastic or a thermoset.
- a polymeric material which may include one or both of a thermoplastic or a thermoset.
- thermoplastic polymer may refer to a material with a macromolecular structure that may repeatedly soften when heated and harden when cooled.
- thermoset polymer may refer to a material which may solidify when first heated under pressure, and which may not be remelted or remolded without destroying its original characteristics.
- Thermoplastic polymer and thermoset polymer may include one or both of addition or condensation polymers.
- thermoset polymers may include one or more of epoxides, melamines, phenolics, or ureas.
- Suitable thermoplastic polymers may include one or more of olefin-derived polymers (for example, polyethylene, polypropylene, or their copolymers), polymethylpentane; diene-derived polymers (for example, polybutadiene, polyisoprene, or their copolymers), polymers of unsaturated carboxylic acids and their functional derivatives (for example, acrylic polymers such as poly(alkyl acrylates), poly(alkyl methacrylates), polyacrylamides, polyacrylonitrile or polyacrylic acid), alkenylaromatic polymers (for example, polystyrene, poly-alpha-methylstyrene, polyvinyltoluene, or rubber- modified polystyrenes), polyamides (for example, nylon- 6, nylon-6,6, nylon- 1,1, or nylon-1,2), polyesters; polycarbonates; polyester carbonates; polyethers (for example, polyarylene ethers, polyethersulfones, polyetherketones, polyether
- the substrate layer may include a thermoplastic polyester.
- thermoplastic polyesters may include one or more of poly(ethylene terephthalate), poly(l,4-butylene terephthalate), poly( 1,3 -propylene terephthalate), poly(cyclohexanedimethanol terephthalate), poly
- the substrate layer may include a thermoplastic elastomeric polyester (TPE).
- TPE thermoplastic elastomeric polyester
- a thermoplastic elastomer may be a material that may be processed as a thermoplastic material, but which may possess some of the properties of a thermoset.
- Suitable thermoplastic elastomeric polyesters may include one or more of polyetheresters containing soft-block segments of poly (alkylene oxide)(for example segments of poly(ethylene oxide) or poly(butylene oxide)); polyesteramides such as those synthesized by the condensation of an aromatic diisocyanate with dicarboxylic acids; or any polyester with a carboxylic acid terminal group.
- the substrate layer may include one or more of a homo- polycarbonate, a co-polycarbonate, or a co-polyester polycarbonate.
- the substrate layer may include a blend of poly(arylene ether) and poly(alkenyl aromatic resins).
- Poly(arylene ether)s may include poly(phenylene ether) (PPE); poly(arylene ether) copolymers, poly(arylene ether) graft copolymers; poly(arylene ether) ether ionomers; block copolymers of alkenyl aromatic compounds, vinyl aromatic compounds, and poly(arylene ether); and combinations thereof.
- Poly(alkenyl aromatic) resins may include non- elastomeric block copolymers, for example diblock, triblock, and multiblock copolymers of styrene and a polyolefin.
- Non-elastomeric block copolymer compositions of styrene and butadiene may also be used that have linear block, radial block, or tapered block copolymer architectures.
- the poly(alkenyl aromatic) resins may also include block copolymers of styrene-polyolefin-methyl methacrylate.
- the optical data storage medium may store data in a land and groove format with the data stored in the grooves or, alternatively, in both the grooves and the lands.
- the substrate of the optical storage medium may be molded to comprise the land and groove pattern.
- the optical data storage medium may be prepared from a substrate having lands and grooves and appropriate data and hard coat layer capable of being read using a laser having a wavelength of less than about 650 nanometers.
- the optical data storage medium may be prepared from a substrate having lands and grooves and appropriate data and hard coat layers capable of being read using a laser having a wavelength of less than about 420 nanometers.
- the substrate may have lands and grooves with a pitch in a range from about 0.05 micrometers to about 0.7 micrometers.
- the pitch may be measured from the center of the groove to the center of an adjacent groove.
- the dimension of the lands and grooves may be selected to provide the highest areal density depending upon the method of retrieving the data.
- the width of the lands may be in the range from about 10 nanometers to about 200 nanometers-
- the height of the lands may be in range from about 10 nanometers to about 100 nanometers.
- Methods that may be employed to produce the substrate layer may include injection molding, foaming processes, sputtering, plasma vapor deposition, vacuum deposition, electrodeposition, spin coating, solvent casting, spray coating, meniscus coating, data stamping, embossing, surface polishing, fixturing, laminating, rotary molding, two shot molding, coinjection, over-molding of film, microcellular molding, or combinations thereof.
- the method employed to produce the substrate layer may allow in-situ production of the substrate having the desired features, for example, lands and grooves.
- the method employed to produce the substrate layer may include an injection molding-compression technique.
- the injection molding- compression technique may include filling a mold with a molten polymer or polymer blend used to produce the substrate.
- the mold may contain a preform or insert.
- the polymer system may be cooled. While still in at least a partially molten state, the polymer system may be compressed.
- the compression of the polymer system may result in imprinting the desired surface features, for example, pits and grooves, onto the desired portions of the substrate.
- the pits and grooves may be arranged in spiral, concentric or any other suitable orientation.
- the writing may occur on one or both sides of the substrate in the desired areas.
- the substrate may be cooled to room temperature.
- additional processing such as electroplating, coating techniques (for example, spin coating, spray coating, vapor deposition, screen printing, painting, dipping, and the like), lamination, sputtering, or combinations thereof may be employed to dispose desired layers on the substrate
- an adhesive layer disposed between the hard coat layer and the data storage layer, and/or between other layers, may be an adhesive layer that may, for example, adhere the hard coat layer to the other layers supported by the substrate.
- an adhesive layer may secure the hard coat layer to the data layer.
- an optical data storage medium 10 may include a hard coat layer 20 secured to a data layer 30 via an adhesive layer 50.
- the data layer 30 further may be secured to a substrate layer 40.
- Suitable adhesive may include one or more of hot melt adhesives, ultraviolet ray- curable adhesives, heat curable adhesives, pressure sensitive adhesives or tacky type adhesives.
- Suitable material for the adhesive may include one or more of rubbers, flexible thermoplastics, or thermoplastic elastomer.
- Suitable examples of adhesive material may include one or more of natural rubber, silicone rubber, acrylic ester polymer, polyisoprene, styrene butadiene rubber, ethylene propylene rubber, fluoro vinyl methyl siloxane, chlorinated isobutene-isoprene, chloroprene, chlorinated polyethylene, chlorosulfonated polyethylene, urethane acrylate, epoxy, epoxy acrylate, polyester acrylate, butyl acrylate, expanded polystyrene, expanded polyethylene, expanded polypropylene, foamed polyurethane, plasticized polyvinyl chloride, dimethyl silicone polymers, methyl vinyl silicone, or polyvinyl acetate.
- the adhesive may optionally include a primer.
- a pressure sensitive may be used in one or more adhesive layers of the optical storage medium.
- the adhesive layer may be applied to the optical storage medium by methods such as vapor deposition, spin casting, solution deposition, injection molding, extrusion molding, or combinations thereof.
- the adhesive layer may provide suitable optical properties required for the application in an optical data storage medium.
- Other properties that the adhesive layer may provide may include one or more of flexibility, creep resistance, resilience, elasticity, or dampening to enhance the quality of playback of the data storage disc.
- the adhesive layer may be employed to enhance the dampening of the disc, with the thickness and nature of the adhesive determining the amount of dampening provided by the layer.
- the thickness of an adhesive layer may be greater than about 1 micrometers. In one embodiment, the thickness of an adhesive layer may in the range from about 1 micrometer to about 5 micrometers, from about 5 micrometers to about 10 micrometers, from about 10 micrometers to about 25 micrometers, or from about 25 micrometers to about 50 micrometers. In one embodiment, the thickness of an adhesive layer may be greater than about 50 micrometers.
- an optical data storage medium 10 may include a hard coat layer 20 secured to a light transmissive layer 60 via an adhesive layer 50.
- the light transmissive layer may further be secured to a data layer 30 via another adhesive layer 50.
- the data layer 30 may be further secured to a substrate layer 40.
- the light transmissive layer may include one or both of an active energy ray-curable material or a thermoplastic polycarbonate material.
- the active energy ray-curable material may include one or more of ultraviolet ray-curable materials, electron ray- curable materials, or gamma-ray curable materials.
- Suitable active energy ray-curable material may include one or more of monomers, oligomers, or polymers having active-energy ray curable groups such as acrylic type double bonds (for example, acrylate, methacrylate, epoxy acrylate, urethane acrylate), allyl type double bonds (for example, diallyl phthalate) and unsaturated double bonds (for example, maleic acid derivatives).
- acrylic type double bonds for example, acrylate, methacrylate, epoxy acrylate, urethane acrylate
- allyl type double bonds for example, diallyl phthalate
- unsaturated double bonds for example, maleic acid derivatives
- Suitable examples of monomers for active energy ray-curable materials may include one or more of styrene, ethyl acrylate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, diethylene glycol methacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, pentaerythritol tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, trimethylolpropane tri(meth)acrylate, trimethylolpropane di(meth)acrylate, or (meth)acrylate of phenol ethylene oxide adduct.
- the light transmissive layer may include a thermoplastic polycarbonate material.
- the thermoplastic polycarbonate may have a structure of formula (XIV);
- R 21 may be a divalent aliphatic radical, a divalent aromatic radical, or a divalent cycloaliphatic radical. In some embodiments, R 21 may be derived from a dihydroxy aliphatic compound, a dihydroxy cycloaliphatic compound or a dihydroxy aromatic compound.
- R 21 may be a divalent aromatic radical derived from a dihydroxy aromatic compound having formula (XV); wherein R 22 and R 23 may be independently at each occurrence an aromatic radical; E may be independently at each occurrence a bond, an aliphatic radical, a cycloaliphatic radical, an aromatic radical, a sulfur-containing linkage, a selenium-containing linkage, a phosphorus-containing linkage, or an oxygen atom; "t” may be a number greater than or equal to one; “v” may be either zero or one; and "u” may be a whole number including zero.
- XV divalent aromatic radical derived from a dihydroxy aromatic compound having formula (XV); wherein R 22 and R 23 may be independently at each occurrence an aromatic radical; E may be independently at each occurrence a bond, an aliphatic radical, a cycloaliphatic radical, an aromatic radical, a sulfur-containing linkage, a selenium-containing linkage, a phosphorus-containing linkage, or an oxygen
- Suitable dihydroxy aromatic compound may include one or more of l,l-bis(4- hydroxyphenyl)cyclopentane; 2,2-bis(3-allyl-4-hydroxyphenyl) ⁇ ro ⁇ ane; 2,2-bis(2-t- butyl-4-hydroxy-5-methylphenyl) ⁇ ropane; 2,2-bis(3-t-butyl-4-hydroxy-6- methylphenyOpropane; 2,2-bis(3-t-butyl-4-hydroxy ⁇ 6-methylphenyl)butane; 1,3 - bis[4-hydroxyphenyl-l-(l-methylethylidine)]benzene; l,4-bis[4-hydroxyphenyl-l-( 1- methylethylidine)]benzene; 1 ,3-bis[3-t-butyl-4-hydroxy-6-methylphenyl- 1-(1- methylethylidine)]benzene; 1 ,4-bis[3-t-butyl-4-hydroxy-6-m ⁇
- a suitable dihydroxy aromatic compound may include a bisphenol having structure of formula (XVI):
- R 24 and R 25 may independently be at each occurrence a halogen atom, a nitro group, a cyano group, an aliphatic radical, a cycloaliphatic radical, or an aromatic radical; V may be independently at each occurrence an integer from 0 to 4; and W may be a bond, an aliphatic radical, a cycloaliphatic radical, or an aromatic radical.
- Representative units of structure (II) may include l,l-bis(4-hydroxy-3- methylphenyl)cyclohexane (DMBPC); l,l-bis(4-hydroxy-3 -methylphenyl)cyclopen; l,l-bis(4-hydroxy-3- methylphenyl)cycloheptane; l,l-bis(4-hydroxy-3- methylphenyl)-3,3,5- trimethylcyclohexane (DMBPI); 2,2-bis(4-hydroxy-3- methyl)propane (DMBPA); 4, 4'-(I -phenylethylidene)bis(2-methylphenol)
- R 21 of formula (XIV) may be derived from bisphenol A (2,2- bis(4-hydroxyphenyl)propane, CAS No. 80-05-7) and the thermoplastic polymeric material may be a Bisphenol A polycarbonate.
- Bisphenol A may be available commercially from ALDRICH Chemical Co.
- Bisphenol A polycarbonate may fall within generic formula (XIV) and represents the case wherein R 21 may be derived from a bisphenol having formula (XVI), wherein "w" in formula (XVI) may be equal to 0, W may be an isopropylidene radical, and the hydroxyl groups may be present at the 4,4' positions.
- Examples of other polycarbonates which may be suitable for use in the light transmissive layer may include, for example, 2,2'-dimethylbisphenol Z polycarbonate, 2,2' dimethylbisphenol A polycarbonate, or bisphenol M
- Methods for preparation of polycarbonates may include one or more of interfacial polymerization using for example, phosgene; a bischloroformate polymerization method using, for example, bisphenol A bischloroformate; and a melt polymerization method using, for example, bisphenol A and a diaryl carbonate, such as diphenyl carbonate.
- the light transmitting layer may have one or more of optically transparency, low optical absorption or reflection in the laser wavelength range to be used, low birefringence, low thickness non-uniformity, or low surface roughness.
- the light transmissive layer may have optical properties such as in- plane retardation of 20 nanometers and lower. "In-plane retardations" as used herein refers to a measure of the birefringence in the optical layer. In one embodiment, for a 100 micrometer thick light transmissive layer, thickness uniformity at length scales longer than 2 centimeters may be on the order of less than 2 micrometers. In one embodiment, for a 100 micrometer thick light transmissive layer, the surface roughness at the 1 millimeter length scale may be on the order of 40 nanometers or less.
- the light transmissive layer may be deposited by vapor deposition (for example, plasma enhanced chemical vapor deposition, and the like), coating (e.g.,
- electrodeposition coating meniscus coating, spray coating, extrusion coating, spin coating, solution coating, and the like
- casting e.g., extrusion casting, solution casting, and the like
- injection molding film blowing, calendaring, or combinations thereof.
- solution casting may be used to produce the light transmissive layer.
- the optical data storage medium may include other layers such as a lubrication layer, a reflective layer, a dielectric layer, print layer, electro-static layer, dissipative layer and others.
- Suitable lubricant layers may include fluoro compounds such as fluoro oils and greases.
- Suitable reflective layers may include one or more aluminum, silver, gold, titanium, and alloys and mixtures comprising at least one of the foregoing.
- the thickness of the reflective metal layer may be such that it may be sufficient to reflect an amount of energy sufficient to enable data retrieval.
- the thickness of the reflective layer may be greater than about 300 Angstroms.
- the thickness of the reflective layer may be in a range from about 300 Angstroms to about 400 Angstroms, from about 400 Angstroms to about 500 Angstroms, from about 500 Angstroms to about 600 Angstroms, or from about 600 Angstroms to about 700 "1 Angstroms.
- the thickness of the reflective layer may be greater than about 700 Angstroms.
- Dielectric layer which may be secured on one or both sides of the data layer and may be employed as heat controllers.
- Dielectric layers may include one or more of nitrides (for example, silicon nitride, aluminum nitride, and others); oxides (e.g., aluminum oxide); carbides (for example, silicon carbide); or alloys and combinations comprising at least one of the foregoing.
- the thickness of the hard coat layer may vary depending upon the other layers present in the optical data storage medium.
- a light transmissive layer may be present in addition to hard coat layer and the average thickness of the hard coat layer may be in a range less than about 10 micrometers.
- the average thickness of the hard coat layer may be in a range from about 1 micrometer to about 2 micrometers, from about 2 micrometers to about 4 micrometers, or from about 5 micrometers to about 10 micrometers.
- the optical data storage medium may be free of a light transmissive layer and the average thickness of the hard coat layer may be in a range greater than about 80 micrometers. In one embodiment, the average thickness of the hard coat layer may be in a range from about 80 micrometers to about 90
- micrometers from about 90 micrometers to about 100 micrometers, from about 100 micrometers to about 125 micrometers, or from about 125 micrometers to about 150 micrometers.
- the curable hard coat layer of the optical data storage medium may be cured to form a cured hard coat layer.
- Curing may include exposure to one or both of heat or radiation. If cured by radiation, the curing may occur by exposure to one or more of ultra-violet radiation, gamma-ray radiation, electron-beam radiation, corona radiation, or plasma. Curing of the hard coat layer may result in change in one or more of birefringence, hardness, modulus, radial tilt change, scratch resistance or coefficient of friction of the hard coat layer.
- the cured hard coat layer may have an average birefringence of about 30 nanometers. In one embodiment, the cured hard coat layer may have an average birefringence in the range from about 10 nanometers to about 15 nanometers, from about 15 nanometers to about 20 nanometers, from about 20 nanometers to about 25 nanometers, or from about 25 nanometers to about 30 nanometers. In one embodiment, the cured hard coat layer may have an average birefringence less than about 30 nanometers.
- the cured hard coat layer may have an average hardness value greater than about 0.1 Giga Pascal measured at an indentation of 100 microNewtons. In one embodiment, the cured hard coat layer may have an average hardness value in range from about 0.1 Giga Pascal to about 0.2 Giga Pascals, from about 0.2 Giga Pascals to about 0.25 Giga Pascals, from about 0.25 Giga Pascals to about 0.3 Giga Pascals, or from about 0.3 Giga Pascals to about 0.4 Giga Pascals measured at an indentation of 100 microNewtons. In one embodiment, the cured hard coat layer may have an average hardness value greater than about 0.4 Giga Pascals, measured at an indentation of 100 microNewtons. hi one embodiment, the cured hard coat layer may have an average pencil hardness value measured by ASTM 3363 of about 7H-
- the cured hard coat layer may have an average modulus value greater than about 0.2 Giga Pascal measured at an indentation of 100 microNewtons. In one embodiment, the cured hard coat layer may have an average modulus value in range from about 0.2 Giga Pascal to about 0.4 Giga Pascals, from about 0.4 Giga Pascals to about 0.6 Giga Pascals, from about 0.6 Giga Pascals to about 0.8 Giga Pascals, or from about 0.8 Giga Pascals to about 1 Giga Pascal measured at an indentation of 100 microNewtons. In one embodiment, the cured hard coat layer may have an average modulus value greater than about 1 Giga Pascal measured at an indentation of 100 microNewtons.
- the cured hard coat layer may have a scratch resistance that results in permanent plastic deformation (scratch area) of less than 0.04 square micrometers using a diamond tip of 1 micrometer radius at a normal force of 200 microNewtons. In one embodiment, the cured hard coat layer may have a scratch resistance that results in permanent plastic deformation (scratch area) in a range from about 0.01 square micrometers to about 0.02 square micrometers, from about 0.02 square micrometers to about 0.03 square micrometers, or from about 0.03 square micrometers to about 0.04 square micrometers, using a diamond tip of 1 micrometer radius at a normal force of 200 microNewtons.
- the cured hard coat layer may have a scratch resistance that results in permanent plastic deformation (scratch area) of less than about 0.01 square micrometers, using a diamond tip of 1 micrometer radius at a normal force of 200 microNewtons. Scratch area ma be defined as a product as a peak-peak width and peak-to-valley depth of a scratch.
- the cured hard coat layer may have a coefficient of friction that is in a range of less than about 0.4 at a normal force of 300 microNewtons. In one embodiment, the cured hard coat layer may have a coefficient of friction in range from about 0.1 to about 0.2, from about 0.2 to about 0.3, or from about 0.3 to about 0.4, at a normal force of 300 microNewtons. In one embodiment, the cured hard coat layer may have a coefficient of friction that is in a range of less than about 0.1 at a normal force of 300 microNewtons.
- tilt may refer to the number of radial degrees by which a data storage medium bends on a horizontal axis, and may be measured as the vertical deviation at the outer radius of the storage medium.
- the radial tilt may be determined by measuring the deflection of a laser beam incident at some angle to the disk. From geometrical considerations the deflection of the laser beam may be equal to two times the radial tilt angle. This may be denoted as the radial deviation and is two times the tilt angle measured in degrees.
- One or more of time, temperature, or humidity may play a role in affecting the tilt of a medium including layers of material mat may exhibit differential rates of shrinkage or expansion when exposed to varying environmental conditions.
- Predictive tests for determining dimensional stability of a data disk assembly may be made by thermal aging the disk assembly at 80 degree Celsius, for a predetermined time followed by measuring the radial tilt.
- Another predictive test may include exposing the data disk assembly to ambient temperature, but cycling the level of humidity while measuring the disk tilt during the cycling process.
- the optical data storage medium may exhibit a radial tilt change value of less than about 0.5 degree measured at a radius of 55 millimeters after 96 hours at 80 degree Celsius.
- the optical data storage medium may exhibit a radial tilt change in a range from about 0.1 degree to about 0.2 degree, from about 0.1 degree to about 0.2 degree, from about 0.2 degree to about 0.3 degree, from about 0.3 degree to about 0.4 degree, or from about 0.4 degree to about 0.5 degree, measured at a radius of 55 millimeters after 96 hours at 80 degree Celsius. In one embodiment, the optical data storage medium may exhibit a radial tilt change value of less than about 0.1 degree measured at a radius of 55 millimeters after 96 hours at 80 degree Celsius.
- the optical data storage medium may exhibit a radial tilt change value of less than about 0.35 degree measured at a radius of 55 millimeters after 10 hours in a 90 percent relative humidity environment. In one embodiment, the optical data storage medium may exhibit a radial tilt change in a range from about 0.1 degree to about 0.15 degree, from about 0.15 degree to about 0.2 degree, from about 0.2 degree to about 0.25 degree, from about 0.25 degree to about 0.3 degree, or from about 0.3 degree to about 0.35 degree, measured at a radius of 55 millimeters after 10 hours in a 90 percent relative humidity environment. In one embodiment, the optical data storage medium may exhibit a radial tilt change value of less than about 0.1 degree measured at a radius of 55 millimeters after 10 hours in a 90 percent relative humidity environment.
- an optical data storage medium may be provided.
- the optical data storage medium may include a data layer and a hard coat layer secured directly to a surface of the data layer.
- the hard coat layer may include a radiation curable or a thermally curable silicone composition.
- the hard coat layer may have an average thickness in a range of greater than about 80 micrometers.
- the data layer surface may be capable of being read, written to, or both read and written to using a laser that may have a wavelength of less than about 420 nanometers.
- an optical data storage medium may be provided.
- the optical data storage medium may include a data layer; a light transmissive layer disposed on the data layer; and a hard coat layer disposed on the light transmissive layer.
- the hard coat layer may include a radiation curable or a thermally curable silicone composition.
- the data layer surface may be read, written to, or both read and written to using a laser that may have a wavelength of less than about 420 nanometers.
- optical data storage medium Numerous methods may be employed to produce the optical data storage medium including one or more of injection molding, foaming processes, sputtering, plasma vapor deposition, vacuum deposition, electrodeposition, spin coating, solvent casting, spray coating, meniscus coating, data stamping, embossing, surface polishing, fixturing, laminating, rotary molding, two shot molding, coinjection, over-molding of film, microcellular molding, or combinations thereof.
- a method for securing a curable hard coat layer directly to a data layer may be provided.
- the method may further include curing the hard coat layer to form a cured hard coat layer and an optical data storage medium.
- the method may further include reading, writing to, or both reading and writing to the data layer using a laser having a wavelength of less than about 420 nanometers.
- a hard coat layer may be formed on a data layer by coating the aforementioned hard coat agent composition.
- the coating method may include one or more of spin coating, dip coating, spray coating, meniscus coating, solvent casting or gravure coating methods.
- the coating method may form an uncured hard coat layer, and this uncured layer may be then irradiated with active energy rays such as ultraviolet rays, electron rays or visible rays or heated to a specific temperature, thereby curing the uncured layer and forming the hard coat layer.
- the data layer further may be secured to a substrate layer.
- the data layer may be applied to the disk substrate by one or more of a sputtering process, electroplating, or coating techniques such as spin coating, spray coating, vapor deposition, screen printing, painting, dipping, sputtering, vacuum deposition, electrodeposition, or meniscus coating.
- a light transmissive layer may be included between the hard coat layer and the data layer.
- the method utilized to produce the light transmissive layer may include one or more of solution casting, extrusion casting, extrusion calendaring, spin coating, or injection molding.
- an adhesive layer may be present between the various layers of the optical data storage medium.
- the adhesive layer may include in the optical data storage medium by methods including one or more of vapor deposition, spin casting, solution deposition, injection molding, or extrusion molding.
- the optical data storage medium may be shaped to allow for the medium to be affixed to a spindle and the data read while the medium may be spun about the spindle.
- the medium may be disk shaped having a hole in the center for affixation to a spindle, and a circular outside diameter.
- Other shapes may also be used rather than circular, including, for example, square, star, octagonal, hexagonal, and the like.
- the dimensions of the storage medium are specified by the industry to enable their use in presently available data storage medium reading and writing devices.
- the data storage medium may have an inner diameter in a range from about 15 millimeters to about 40 millimeters and an outer diameter in a range from about 65 millimeters to about 130 millimeters.
- Other possible dimensions may include an inner diameter in a range from about 1 millimeter to about 100 millimeters and an outer diameter in a range from about 5 millimeters to about 300 millimeters.
- the optical data storage medium may have a storage capacity of greater than about 22 gigabytes, greater than about 25 gigabytes, or greater than about 27 gigabytes per disk side. Accordingly, double-sided disks may have a storage capacity of greater than about 44 gigabytes, greater than about 50 gigabytes, or greater than about 54 gigabytes.
- the transfer rate of the data storage medium may be greater than about 25 megabytes per second, greater than about 30 megabytes per second, or greater than about 35 megabytes per second.
- the hard coats that may be used may include commercial hard coats available from GE Silicones under the tradenames of UV HC3000, UV HC8558, SHC 5020 and AS4000 or those available from SDC Coatings, Anaheim, California under the trade name of MPl 175U and PFl 153.
- An optical data storage medium is prepared from a 1.1 millimeter (mm) thick substrate made from bisphenol-A polycarbonate resin (OQ1050, Optical quality polycarbonate available from GE Plastics).
- a thin aluminum reflective data layer (0.05 micrometers to 0.10 micrometers) is sputtered onto the substrate layer.
- a pressure sensitive adhesive layer (approximately 25 micrometers in thickness) is applied to the metallized portion of the substrate followed by a light transmissive layer made from bisphenol-A polycarbonate (BPA- PC) (about 75 micrometers in thickness) using a ⁇ itto tape applicator manufactured by Record Products of America.
- the data disk assembly is completed by pressing the stack in a Carver laminator press at 60° C. and 80 pounds per square inch (psi; 5.6 kgf/cm 2 ) for 5 minutes to fully bond the layers.
- An optical data storage medium is prepared from a 1.1 millimeter (mm) thick substrate made from bisphenol-A polycarbonate resin (OQl 050, Optical quality polycarbonate available from GE Plastics).
- a thin aluminum reflective data layer (0.05 micrometers to 0.10 micrometers) is sputtered onto the substrate layer.
- a pressure sensitive adhesive layer (approximately 25 micrometers in thickness) is applied to the metallized portion of the substrate followed by a light transmissive layer made from bisphenol-A polycarbonate (BPA- PC) (about 75 micrometers in thickness) using a nitto tape applicator manufactured by Record Products of America.
- a hard coat layer made from UVHC3000 is spin coated onto the BPA-PC layer to form a hard coat layer.
- the thickness of the hard coat layer is the range from about 2 micrometers to about 3 micrometers.
- the speed of spin coating is varied in the range from about 400 rpm to about 2500 rpm depending upon the thickness required.
- the data disk assembly is completed by pressing the stack in a Carver laminator press at 60° C. and 80 pounds per square inch (psi; 5.6 kgf/cm 2 ) for 5 minutes to fully bond the layers.
- the spin-coated medium is exposed to UV light to cure the hard coat at a dosage of 5-15 Joules/cm 2 with an intensity of 0.6-1.6 Watts/cm 2 .
- the exposure is conducted using a 300-600 Watt Fusion Type H UV bulb for 1-2 minutes at 25 degrees Celsius followed by 2-6 minutes at 63-85 degrees Celsius.
- the optical data storage medium is prepared in the same way as that in Example 1, except the hard coat layer is made from MPl 175UV.
- the optical data storage medium is prepared in the same way as that in Example 1, except the hard coat layer is made from UVHC8558.
- the optical data storage medium is prepared in the same way as that in Example 1, except the hard coat layer is made from PFl 153.
- the optical data storage medium is prepared in the same way as that in Example 1, except the hard coat layer is made from AS4700.
- the optical data storage medium is prepared in the same way as that in Example 1, except the hard coat layer is made from SHC5020.
- Optical data storage medium fabricated in Comparative Example 1 and Examples 1-6 are tested to determine hardness, modulus, scratch resistance and coefficient of friction of the hard coat layer and radial tilt change of the optical data storage medium.
- Table 1 shows the hardness and modulus values measured at an indentation of 0.1 milliNewtons for Comparative Example 1 and Examples 1, 2, and 3. Table 1 also shows the coefficient of friction values measured at a normal force of 0.3
- the optical storage media with hard coat shows higher values of hardness and modulus and lower values of coefficient of friction.
- FIG.4 shows the scratch area obtained by varying the normal force for Comparative Example 1 (curve 100) and Examples 1, 2 and 3 (curves 70, 80 arid 90). At all values of normal forces the scratch area is lower for optical storage media with a hard coat layer.
- the optical data storage media of Comparative Example 1 and Examples 1-6 are equilibrated in an environment of a humidity of about 50 percent. Data storage disks are transferred from this first environment of an initial humidity of about 50 percent, to a second environment with humidity of about 90 percent. The tilt of the data storage disks is measured over time at a radius of 55 mm while the disk equilibrated in the 90 percent humidity.
- FIG. 5 shows the radial tilt change values for
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Abstract
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JP2008544576A JP2009518776A (ja) | 2005-12-09 | 2006-12-08 | 記憶媒体及び関連方法 |
EP06845172A EP1969595A2 (fr) | 2005-12-09 | 2006-12-08 | Support de stockage et procede associe |
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US11/338,544 US20070134463A1 (en) | 2005-12-09 | 2006-01-24 | Storage media and associated method |
US11/338,365 | 2006-01-24 | ||
US11/338,544 | 2006-01-24 | ||
US11/338,365 US20070134462A1 (en) | 2005-12-09 | 2006-01-24 | Storage media and associated method |
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WO2007067800A2 true WO2007067800A2 (fr) | 2007-06-14 |
WO2007067800A3 WO2007067800A3 (fr) | 2007-07-26 |
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PCT/US2006/047159 WO2007067800A2 (fr) | 2005-12-09 | 2006-12-08 | Support de stockage et procede associe |
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EP (1) | EP1969595A2 (fr) |
JP (1) | JP2009518776A (fr) |
KR (1) | KR20080086448A (fr) |
WO (1) | WO2007067800A2 (fr) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3885054A4 (fr) * | 2018-11-21 | 2022-08-17 | Daicel Corporation | Composition de revêtement dur résistant aux intempéries pour métal, produit durci et substrat métallique revêtu |
EP3885053A4 (fr) * | 2018-11-21 | 2022-08-17 | Daicel Corporation | Composition de revêtement dur résistant aux intempéries pour substrat de substitution de verre, produit durci et produit stratifié |
CN117649863A (zh) * | 2023-12-06 | 2024-03-05 | 四川大学 | 含poss纳米材料的光致聚合物全息存储材料、制备方法及应用 |
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DE102017004541A1 (de) * | 2017-05-11 | 2018-11-15 | Klüber Lubrication München Se & Co. Kg | Schmierstoffzusammensetzung |
Family Cites Families (5)
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US4275118A (en) * | 1979-01-15 | 1981-06-23 | Dow Corning Corporation | Pigment-free coatings with improved resistance to weathering |
US6440518B1 (en) * | 2000-12-28 | 2002-08-27 | Brandon L. Upper | Coating for optical information disks |
TWI242206B (en) * | 2001-06-22 | 2005-10-21 | Fuji Photo Film Co Ltd | Optical information recording medium |
WO2004047094A1 (fr) * | 2002-11-18 | 2004-06-03 | Asahi Glass Company, Limited | Disque optique muni d'une couche de revetement dur dont la surface dispose d'un pouvoir lubrifiant |
US20050048252A1 (en) * | 2003-08-26 | 2005-03-03 | Irene Dris | Substrate and storage media for data prepared therefrom |
-
2006
- 2006-12-08 EP EP06845172A patent/EP1969595A2/fr not_active Withdrawn
- 2006-12-08 KR KR1020087013888A patent/KR20080086448A/ko not_active Withdrawn
- 2006-12-08 JP JP2008544576A patent/JP2009518776A/ja not_active Withdrawn
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3885054A4 (fr) * | 2018-11-21 | 2022-08-17 | Daicel Corporation | Composition de revêtement dur résistant aux intempéries pour métal, produit durci et substrat métallique revêtu |
EP3885053A4 (fr) * | 2018-11-21 | 2022-08-17 | Daicel Corporation | Composition de revêtement dur résistant aux intempéries pour substrat de substitution de verre, produit durci et produit stratifié |
US11866608B2 (en) | 2018-11-21 | 2024-01-09 | Daicel Corporation | Weather-resistant hard coat composition for metal, cured product, and coated metal substrate |
US11898057B2 (en) | 2018-11-21 | 2024-02-13 | Daicel Corporation | Weather-resistant hard coat composition for glass-substitute substrate, cured product, and laminate |
CN117649863A (zh) * | 2023-12-06 | 2024-03-05 | 四川大学 | 含poss纳米材料的光致聚合物全息存储材料、制备方法及应用 |
CN117649863B (zh) * | 2023-12-06 | 2024-06-11 | 四川大学 | 含poss纳米材料的光致聚合物全息存储材料、制备方法及应用 |
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JP2009518776A (ja) | 2009-05-07 |
EP1969595A2 (fr) | 2008-09-17 |
KR20080086448A (ko) | 2008-09-25 |
WO2007067800A3 (fr) | 2007-07-26 |
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