摘要:
A binder composition for a magnetic recording medium contains a vinyl copolymer having structural units denoted by each of formulas [1], [2] and [3]. In formula [1], R1 is hydrogen, halogen, or methyl, L1 is a single bond or a divalent linking group, and Y is an alicyclic group. In formula [2], R2 is hydrogen, halogen, or methyl, L2 is a single bond or a divalent linking group, and Z is a hydrocarbon group with a carbon number of from 8 to 50. In formula [3], R3 is hydrogen, halogen, or methyl, and L3 is a single bond or a divalent linking group:
摘要:
A binder composition for a magnetic recording medium contains a vinyl copolymer having a structural unit of general formula [1]: wherein R1 is H, halogen, or methyl, L1 is a single bond or a divalent linking group, and Y is an alicyclic group; a structural unit of general formula [2]: wherein R2 is H, halogen, or methyl, L2 is a single bond or a divalent linking group, and Z is a hydrocarbon group with a carbon number of from 8 to 50; and a structural unit of general formula [3]: wherein R3 is H, halogen, or methyl, and L3 is a single bond or a divalent linking group.
摘要:
A magnetic recording medium comprising: a nonmagnetic support; and a magnetic layer containing ferromagnetic powder and a binder, wherein the nonmagnetic support contains polyester, the nonmagnetic support has gauche/trans peak intensity ratio of 0.50 or less as determined by a ATR-FT-IR method, and a shrinkage percentage of the magnetic recording medium after storage for 1 week under a conditions of 70° C. and 5% RH is 0.040% or less.
摘要:
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.
摘要翻译:本发明的一个方面涉及通过玻璃结晶法制造的平均板直径为15〜25nm,平均板比例为2.0〜2.8,矫顽力(Hc)的六方晶系铁氧体磁粉, 范围从159到279 kA / m。
摘要:
A magnetic recording and reproduction method comprising recording or reproducing a track of a rotating magnetic disk by means of a magnetic head, wherein the magnetic disk comprises a support and a magnetic layer containing ferromagnetic powder and a binder; the track has a breadth of 2 μm or less; and a frictional force between the magnetic layer and the magnetic head at innermost peripheral area of a recording region of the magnetic disk is 30 mN or less, a frictional force between the magnetic layer and a magnetic head at outermost peripheral area of a recording region of the magnetic disk is 20 mN or less, and a ratio of the frictional force at the innermost peripheral area to the frictional force at the outermost peripheral area is from 1.0 to 4.0.
摘要:
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],: wherein, in general formula [1], R1 denotes a hydrogen atom, a halogen atom, or a methyl group, L1 denotes a single bond or a divalent linking group, and Y an alicyclic group; a structural unit denoted by general formula [2]: wherein, in general formula [2], R2 denotes a hydrogen atom, a halogen atom, or a methyl group, L2 denotes a single bond or a divalent linking group, and Z denotes a hydrocarbon group with a carbon number ranging from 8 to 50; and a structural unit denoted by general formula [3]: wherein, in general formula [3], R3 denotes a hydrogen atom, a halogen atom, or a methyl group, and L3 denotes a single bond or a divalent linking group.
摘要:
A magnetic recording and reproduction method comprising recording or reproducing a track of a rotating magnetic disk by means of a magnetic head, wherein the magnetic disk comprises a support and a magnetic layer containing ferromagnetic powder and a binder; the track has a breadth of 2 μm or less; and a frictional force between the magnetic layer and the magnetic head at innermost peripheral area of a recording region of the magnetic disk is 30 mN or less, a frictional force between the magnetic layer and a magnetic head at outermost peripheral area of a recording region of the magnetic disk is 20 mN or less, and a ratio of the frictional force at the innermost peripheral area to the frictional force at the outermost peripheral area is from 1.0 to 4.0.
摘要:
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]: wherein, in general formula [1], R1 denotes a hydrogen atom, a halogen atom, or a methyl group, L1 denotes a single bond or a divalent linking group, and Y an alicyclic group; a structural unit denoted by general formula [2]: wherein, in general formula [2], R2 denotes a hydrogen atom, a halogen atom, or a methyl group, L2 denotes a single bond or a divalent linking group, and Z denotes a hydrocarbon group with a carbon number ranging from 8 to 50; and a structural unit denoted by general formula [3]: wherein, in general formula [3], R3 denotes a hydrogen atom, a halogen atom, or a methyl group, and L3 denotes a single bond or a divalent linking group.
摘要:
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.
摘要翻译:本发明的一个方面涉及通过玻璃结晶法制造的平均板直径为15〜25nm,平均板比例为2.0〜2.8,矫顽力(Hc)的六方晶系铁氧体磁粉, 范围从159到279 kA / m。
摘要:
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.