Matsubaguchi
Satoshi Matsubaguchi, Odawara-Shi JP
Patent application number | Description | Published |
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20100304187 | HEXAGONAL FERRITE MAGNETIC POWDER AND METHOD OF MANUFACTURING THE SAME, AND MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME - An aspect of the present invention relates to a hexagonal ferrite magnetic powder manufactured by a glass crystallization method as well as having an average plate diameter ranging from 15 to 25 nm, an average plate ratio ranging from 2.0 to 2.8 and a coercive force (Hc) ranging from 159 to 279 kA/m. | 12-02-2010 |
20110076517 | BINDER COMPOSITION FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM - An aspect of the present invention relates to a binder composition for a magnetic recording medium, which comprises a vinyl copolymer comprising a structural unit denoted by general formula [1],: | 03-31-2011 |
Satoshi Matsubaguchi, Kanagawa JP
Patent application number | Description | Published |
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20090092857 | METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM MANUFACTURED BY THE SAME - The present invention relates to a method of manufacturing a magnetic recording medium comprising coating a magnetic layer coating liquid comprising a ferromagnetic hexagonal ferrite powder and a binder to form a coating film, subjecting the coating film to orientation processing while the coating film is still wet, and drying the coating film to form a magnetic layer. The magnetic layer coating liquid is prepared by subjecting a ferromagnetic hexagonal ferrite powder with an average plate diameter of 10 to 50 nm to a dry comminution step, subjecting the ferromagnetic hexagonal ferrite powder to a first dispersion step together with a binder to prepare a dispersion liquid, and sequentially subjecting the dispersion liquid obtained to a second dispersion step and a filtering step. The dispersion liquid obtained by the first dispersion step comprises a dry solid component in an amount, as measured after filtration, of 15 percent or less. | 04-09-2009 |
20090174970 | MAGNETIC RECORDING MEDIUM, MAGNETIC SIGNAL REPRODUCTION SYSTEM AND MAGNETIC SIGNAL REPRODUCTION METHOD - The present invention relates to a magnetic recording medium comprising a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The magnetic layer has a thickness ranging from 30 to 130 nm, and a glossiness of the magnetic layer surface ranges from 155 to 270 percent. | 07-09-2009 |
Satoshi Matsubaguchi, Minami-Ashigara-Shi JP
Patent application number | Description | Published |
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20110244270 | BINDER COMPOSITION FOR MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM - An aspect of the present invention relates to a binder composition for a magnetic recording medium, which comprises a vinyl copolymer comprising a structural unit denoted by general formula [1]: | 10-06-2011 |