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| Number | Title | Issue Date |
| 8062778 | Magnetic recording disk and method for manufacture thereof In order to obtain a magnetic recording disk that exhibits high reliability even if the flying height of a magnetic head becomes very narrow, a lubricant is specified in terms of both molecular structure and quantitative data. That is, a lubricating layer 14 ... | 11/22/2011 |
| 8039132 | Perfluoropolyether compound, and lubricant and magnetic disk each using the same A compound of the formula (I), and lubricant, and magnetic disk each using the same A-(CH2—Rf—CH2O—B—O)n—CH2—Rf—CH2-A (I) wherein n is an integer of 1 to 4, A is a group of... | 10/18/2011 |
| 8007932 | Magnetic disk and magnetic disk unit Embodiments of the present invention provide a magnetic disk having a lubricating layer formed on the surface thereof, which meets all the requirements for adhesiveness, adequate flowability, and strong binding power. In a particular embodiment, a magnetic disk has ... | 08/30/2011 |
| 7910233 | Magnetic recording medium for thermally assisted recording A magnetic recording medium for use in a thermally assisted recording system is disclosed. The magnetic recording medium comprises at least a magnetic layer, a protective layer and a lubricant layer formed on a nonmagnetic substrate, wherein a lubricant of the lubri... | 03/22/2011 |
| 7833641 | Magnetic disk Disclosed is a magnetic disk which has a lubricant layer with excellent heat resistance and high adhesiveness and is free from fly-stiction failure or corrosion failure even at an extremely low flying height of 10 nm or lower. Also disclosed is a magnetic disk which... | 11/16/2010 |
| 7682712 | Stability polymeric lubricants and thin film recording media comprising same A data/information storage and retrieval medium comprises: (a) a substrate having a layer stack thereon, the layer stack including an outer surface and comprising at least one magnetic or magneto-optical (“MO”) recording layer;... | 03/23/2010 |
| 7531250 | Stability polymeric lubricants and thin film recording media comprising same A data/information storage and retrieval medium comprises: (a) a substrate having a layer stack thereon, the layer stack including an outer surface and comprising at least one magnetic or magneto-optical (“MO”) recording layer;... | 05/12/2009 |
| 7354666 | Photo process to improve tribological performance of thin lubricant film A system and method for improving the durability and reliability of recording media used in hard drives is disclosed. A protective overcoat made of diamond like carbon (DLC) is first deposited over a magnetic layer. A lubricant layer, typically containing Moresco lu... | 04/08/2008 |
| 7277254 | Magnetic recording disk and process for manufacture thereof A magnetic recording disk having a substrate, a magnetic layer formed on the substrate, a protective layer formed on the magnetic layer and a lubricant layer formed on the protective layer, the lubricant layer containing a perfluoropolyether compound having an end m... | 10/02/2007 |
| 7252897 | Magnetic recording disk and process for manufacture thereof A magnetic recording disk having a substrate, a magnetic layer formed on the substrate, a protective layer formed on the magnetic layer and a lubricant layer formed on the protective layer, the lubricant layer containing a perfluoropolyether compound having an end m... | 08/07/2007 |
| 7247397 | Thermally stable perfluoropolyether lubricant for recording media The invention provides a lubricant useful in magnetic recording media and optical recording media comprising a functionalized perfluoropolyether comprising multiple acrylate endgroups. More specifically, the lubricant of the invention is a functionalized perfluoropo... | 07/24/2007 |
| 7199087 | Method to refine lubricant for a magnetic recording medium A method refines a lubricant comprising a compound having a perfluoropolyether structure via supercritical extraction. A lubricant is refined using the method and a magnetic recording medium that utilizes the refined lubricant. The refined lubricant exhibits excelle... | 04/03/2007 |
| 7186787 | Linear perfluoropolyethers having an improved thermooxidative stability Linear perfluoropolyethers of formula: T-O(CF2O)n(CF2CF2O)m(CF2CF2CF2O)r(CF2CF2CF2CF2O)s-T1... | 03/06/2007 |
| 7105241 | Magnetic disk and method of manufacturing same Disclosed is a method of manufacturing magnetic disks, comprising a magnetic layer, a protective layer, and a lubricating layer on a substrate. In the process, a lubricant alpha comprising a compound denoted by chemical formula HO—CH2—CH(OH)... | 09/12/2006 |
| 7098173 | Thermally stable antifoam agent for use in automatic transmission fluids Antifoam compositions for automatic transmission fluids contain antifoam agents comprising perfluoropolyether compounds (PFPE). An automatic transmission fluid is provided containing the antifoam composition in a lubricating base oil, along with conventional additiv... | 08/29/2006 |
| 6663971 | Branched perfluoro polyethylene glycol (PF-PEG) high performance thin film disk lubricants A non-linear perluoro polyalkylene or perfluoro polyarylene glycol of specific molecular conformation such as plate-like, spherical, or helical and having the formula CFx --[--(--RO--)n --CF3 ]4-x, wherein R is ... | 12/16/2003 |
| 6645634 | Magnetic recording medium and method for manufacturing same To avoid troubles associated with high-density recording and fast transfer rate, such as decomposition of lubricant involved in a low floating height magnetic head and migration of lubricants involved in high speed rotation of a magnetic recording medium,... | 11/11/2003 |
| 6617011 | Elastomeric lubricants for magnetic recording media Elastomeric fluoropolyether lubricant topcoats are formed on a protective overcoat of a magnetic recording medium. Embodiments include forming a an amorphous carbon layer having a thickness of no greater than about 25 Å as the protective overcoat and pol... | 09/09/2003 |
| 5536425 | Perfluoropolyether derivatives, and lubricants and magnetic recording medium using the same Novel perfluoropolyether derivatives are described which are obtained from perfluoropolyethers having a carboxyl group at one or both ends and monoamines or diamines. The derivative is useful as a lubricant owing to its significantly improved lubricity. T... | 07/16/1996 |
| 5536578 | Magnetic recording medium comprising a protective layer and a layer of ammonium carboxylate fluorine-containing compound A magnetic recording medium is produced by coating a body having (a) a non-magnetic substrate, (b) at least one magnetic substance layer formed on the non-magnetic substrate and (c) at least one protective layer formed on the magnetic substance layer whic... | 07/16/1996 |
| 5510181 | Lubricant and magnetic recording medium using the same A fluorine-containing lubricant having a linear structure devoid of polar groups at the terminals of its molecule, and has at least two polar groups on the intermediate carbon chain of the molecule is disclosed. A magnetic recording medium employing the l... | 04/23/1996 |
| 5498457 | Magnetic recording medium having a lubricant layer comprising ionically interbonded fluoropolyethers with acidic and basic terminal groups A highly reliable rotary magnetic recording medium has a lubricating film layer on its surface, the lubricating film layer being composed of fluoropolyether having at least two acidic functional groups in one molecule as a lubricant and fluoropolyether ha... | 03/12/1996 |
| 5292585 | Magnetic recording medium comprising a magnetic film layer and a coating of purified perfluoropolyther lubricant A magnetic recording medium having coated thereon a lubricant of such a purity that no impurities and low molecular weight species are substantially detected by gel permeation chromatography.... | 03/08/1994 |
| 5252400 | Fluorine-containing compounds Disclosed in this invention are novel fluorine-contianing compounds of a specific molecular structure having a fluoroalkylether terminal group, an aliphatic hydrocarbon terminal group and an imino terminal group in the same molecule and a molecular weight... | 10/12/1993 |
| 5219651 | Magnetic recording apparatus comprising a magnetic recording medium and a magnetic head each coated with a coating of a binder and a specified fluorolubricant A magnetic recording medium which comprises a non-magnetic substrate, a thin film magnetic layer formed on the surface of the substrate and an organic thin film protective layer formed on the magnetic layer, the organic thin film protective layer having a... | 06/15/1993 |
| 5198136 | Iodine-containing compound, preparation thereof and block copolymer comprising the same An iodine-containing compound consisting of at least two repeating units selected from the formulae: --(CH2 CF2 CF2 O)a -- --(CHClCF2 CF2 O)b -- --(CCl2 CF2 CF2 | 03/30/1993 |
| 5188747 | Fluorine-containing lubricant compounds A fluorine-containing compound represented by the general formula [I]: ##STR1## wherein Rf, X, Y, W, Z, R1 -R3, l, m and n are as defined in the specifications. There are disclosed fluorine-containing compounds of spe... | 02/23/1993 |
| 5149564 | Method of forming lubricating film and a method of preparing magnetic recording medium A method of forming a lubricating film which comprises to apply an emulsion composed of a fluorinated polymer, a surfactant and a dispersing medium to a substrate and then dry the film, and a method of preparing a magnetic recording medium which comprises... | 09/22/1992 |
| 5082714 | Magnetic recording media The running properties and durability under a wide range of temperature and humidity conditions are improved by the presence of terminally modified polyhexafluoropropylene on a thin ferromagnetic metal film.... | 01/21/1992 |
| 5071715 | Magnetic recording medium with a lubricant layer containing a perfluoro polyoxyalkyl compound A magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed thereon, at least the surface portion of said magnetic layer being made from an organic compound having a perfluoro group and a hydrocarbon containing group is exc... | 12/10/1991 |
| 4871625 | Synthetic lubricant for lubricating thin film and magnetic recording medium A synthetic lubricant for lubricating a thin film containing a phosphonitrile ester obtained by cyclic polymerization or ring opening polymerization and represented by the following general formula (I): ##STR1## wherein n represents 3 to 10, and Rf a... | 10/03/1989 |
| 4849291 | Magnetic recording element A magnetic recording element comprises a polymeric film substrate on which is formed a thin CoNi recording layer. Over the latter is a protective layer of an acrylic copolymer of a perfluoroalkyl methanol ester of acrylic or methacrylic acid, preferably f... | 07/18/1989 |
| 4808472 | Fluoropolyethers containing end groups endowed with anchoring capacity Compounds suitable for being used as lubricants, having general formula: or where R=--CF3, --C2 F5, --C3 F7 X=F, --CF3 R"=F, --CF3, --C2 F5 m=an integer from 3 to 100 n=a ... | 02/28/1989 |
| 4786544 | Magnetic recording medium A magnetic recording medium comprising a substrate, a magnetic layer formed on at least one surface of the substrate and a lubricant layer comprising at least two components substantially incompatible with each other, coated on the surface of the magnetic... | 11/22/1988 |
| 4757145 | Fluoropolyethers containing end groups endowed with anchoring capacity Compounds suitable for being used as lubricants, having general formula: or where R=--CF3, --C2 F5, --C3 F7 X=F, --CF3 R"=F, --CF3, --C2 F5 m=an integer from 3 to 100 n=a ... | 07/12/1988 |
| 4746575 | Process for lubricating accessories of cassettes containing magnetic tapes Process for protecting magnetic tapes, during their operation, from the friction and wear caused by the contact with accessories, either or not metallic, forming the cassette which contains said tapes, characterized in that said accessories are lubricated... | 05/24/1988 |
| 4699969 | Fluorinated polymers and resins prepared therefrom New resins containing urethane and/or epoxy bonds are prepared starting from fluorinated polymers having an epoxy structure and exhibiting structural characteristics predominantly typical of epoxides or of polyols, said polymers being prepared by synthesi... | 10/13/1987 |
| 4681693 | Stabilizers with arylphosphinic structure for perfluoro-polyether oils and greases New products having the structure of arylphosphines or of derivatives of arylphosphines with an oxygen or sulphur atom directly bonded to the phosphorus atom, containing perfluoroalkylether chains, characterized in that such chains are bonded to the benze... | 07/21/1987 |
| 4681925 | Fluorinated polyacrylates and polyacrylamides having a controlled cross-linking degree, and process for preparing same This invention relates to the preparation of new fluorinated polymers starting from acrylic esters and/or acrylamides, in which the cross-linking degree of the final product is controlled by using, as a starting product, a mixture of mono- and di-acryl mo... | 07/21/1987 |
| 4671999 | Magnetic recording media having perfluoropolyether coating Polymeric compositions are provided in which perfluoropolyethers have been solubilized in non-fluorinated solvents by combining them with a solubilizing agent such as azotic conjugated compounds, and phosphorylated compounds. Typical of the perfluoropolye... | 06/09/1987 |
