摘要:
A magnetic recording medium, which comprises: a backcoat layer; a nonmagnetic support; a nonmagnetic layer; and a magnetic layer, in this order, wherein the backcoat layer has Tg of from 65 to 95° C., and the binder constituting the backcoat layer satisfies the following requirements: (1) the binder comprises a vinyl chloride-based resin (PVC) and a polyurethane resin (PU); (2) PVC has a solubility parameter of from 9 to 11 (cal·cm3)1/2, Tg of from 65 to 95° C. and Mw of from 5000 to 25000; (3) a ratio of PVC to the total mass of PVC and PU is from 10 to 60% by mass; (4) PU has a solubility parameter of from 9.5 to 11.5 (cal·cm−3)1/2, Tg of from 80 to 110° C. and Mw of from 20000 to 60000; and (5) a ratio of PU to the total mass of PVC and PU is from 90 to 30% by mass.
摘要:
A magnetic recording medium including a nonmagnetic support and a magnetic layer containing ferromagnetic powder and a binder, wherein the magnetic layer contains diamond particles having an average particle size of from 20 to 100 nm, a volume per a particle of the ferromagnetic powder is from 100 to 8,000 nm3, and the support has an intrinsic viscosity of from 0.40 to 0.60 dl/g and is substantially free from particles.
摘要:
A magnetic recording medium including: a nonmagnetic support; a conductive layer containing at least one material selected from the group consisting of: metals; semimetals; alloys; oxides of metals, semimetals and alloys; and composites of metals, semimetals and alloys; and a magnetic layer containing ferromagnetic powder and a binder, provided in this order, wherein a surface of the conductive layer has a surface electric resistance of is from 1×102 Ω/□ to 1×1012 Ω/□.
摘要:
An alarm device for a clutch that issues an alarm indicating a lifetime expiration of the clutch that selectively connects and disconnects an input shaft to and from an output shaft, includes: a slip heat release threshold setting unit 104 that establishes a threshold criteria as to a clutch damage or the clutch lifetime, in a form of a relation between a heat release generated in a clutch slip operation and a frequency of the heat release occurrences; and a slip heat release calculator 105 that calculates the heat release during the clutch operation, based on a hydraulic oil pressure in an actual clutch operation and a relative circumferential speed between input and output shafts, the alarm device 11 issues the alarm based on the calculation result through the slip heat release calculating means 105 and the slip heat release threshold setting means 104.
摘要:
A magnetic recording and reproducing method comprising recording and reproducing a signal with a magnetic head in a track width (A) of less than 5 &mgr;m on a magnetic recording medium comprising a support having provided thereon a magnetic layer containing at least a ferromagnetic powder, an abrasive and a binder, wherein the average longer size (B) of the abrasive particle(s) which are present on the magnetic layer surface is ⅓ or less of the track width (A).
摘要:
The invention provides a magnetic recording medium comprising a support having provided thereon a nonmagnetic layer containing a nonmagnetic powder, and a magnetic layer containing a ferromagnetic powder formed on the nonmagnetic layer after coating and drying thereof, wherein the ferromagnetic layer is a hexagonal ferrite powder having an average tabular diameter of 15 to 40 nm or a ferromagnetic metal powder having an average major axis length of 25 to 100 nm, the thickness of the magnetic layer is from 0.01 to 0.3 μm, the thickness of the nonmagnetic layer is from 0.5 to 5 μm, and the specific surface area and the total pore volume of the magnetic recording medium itself measured by a nitrogen absorption measured method are from 0.1 to 50 m2/g and from 0.001 to 1 ml/g, respectively, thereby being to provide the magnetic recording medium for high density recording remarkably improved in electromagnetic characteristics, particularly in high density recording characteristics.
摘要:
Provided is a magnetic recording medium affording both reduced head abrasion and good durability in high-density magnetic recording and reproduction systems employing MR heads as reproduction heads. The magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder, a binder and an abrasive in this order on a nonmagnetic support. The abrasive comprises carbide having a mean particle diameter ranging from 0.02 to 0.10 micrometer.
摘要:
Provided is a magnetic recording medium capable of achieving high reproduction output in a short wavelength region. The magnetic recording medium comprises 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 squareness ranging from 0.6 to 1.0 in a perpendicular direction, and the magnetic recording medium is employed for recording a magnetic signal on the medium in a longitudinal direction at a linear recording density of equal to or greater than 300 Kbpi using a recording head with a gap length of equal to or less than 0.3 micrometer, and reproducing the magnetic signal using a magnetoresistive head with a shield spacing of equal to or less than 0.2 micrometer.
摘要:
The present invention provides a magnetic recording medium, which comprises a primer layer containing at least a nonmagnetic lower layer on a support and at least one layer of magnetic layer with ferromagnetic powder dispersed in a binder, said magnetic layer being provided on said primer layer, whereby at least one type of compounds selected from the following general formulae (1) and (2) is contained at least in the primer layer: where R1 is an alkyl group with 1 to 2 carbon atoms; and R2, R3, and R4 each represents a hydrocarbon group having 4 to 21 carbon atoms.
摘要翻译:本发明提供了一种磁记录介质,其包括在载体上至少含有非磁性下层的底漆层和分散在粘合剂中的铁磁性粉末的至少一层磁性层,所述磁性层设置在所述底漆层上, 其中至少一种选自以下通式(1)和(2)的化合物至少在底漆层中含有:其中R 1是具有1至2个碳原子的烷基; R 2,R 3,R 4各自表示碳原子数为4〜21的烃基。
摘要:
A high-capacity magnetic disk comprises a support, a non-magnetic layer and a magnetic layer having a thickness less than 0.15 &mgr;m and containing ferromagnetic powder selected from fine particles of ferromagnetic metal or fine particles of ferromagnetic hexagonal ferrite dispersed in a binder, and the magnetic disk has a track width less than 5 &mgr;m and can record signals having a bit length less than 0.5 &mgr;m, wherein the ratio of the track width to the average major axis length or tabular diameter of ferromagnetic particles is from 50 to 100, the ratio of the shortest bit length to the average major axis length or tabular diameter of ferromagnetic particles is from 3 to 20, and the thickness of magnetic layer has a variation coefficient of 0.5 or below, expressed in terms of a ratio of the standard deviation to the average thickness of the magnetic layer.