Abstract: A magnetic recording medium comprising a non-magnetic support having coated thereon a magnetic layer, the magnetic layer containing (i) ferromagnetic alloy particles having an average length in the long axis of 0.25 .mu.m or less and (ii) fatty acid components comprising behenic acid in an amount of 20 to 75 wt%, stearic acid in an amount of 10 to 45 wt% and oleic acid in an amount of 10 to 45 wt% based on the total weight of the three fatty acids.

Abstract: A magnetic recording media comprising a nonmagnetic supporting substrate and a ferromagnetic alloy powder-containing magnetic layer applied onto the surface thereof is produced by:pre-dispersing a ferromagnetic alloy powder with and in a binder, said alloy having a specific surface area (S.sub.BET) of no less than 45 m.sup.2 /g and an absorbed water content of no higher than 1.2% by weight resulting in a pre-dispersion;mixing and dispersing an additional binder with and in the pre-dispersion; andcoating the resultant mixed and dispersed magnetic coating liquid onto said nonmagnetic supporting substrate.

Abstract: A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, characterized in that said magnetic recording layer contains an inorganic plate powder having the maximum diameter of not larger than 1.0 .mu.m and a thickness of not larger than 0.1 .mu.m.

Abstract: A magnetic recording medium is disclosed which comprises a non-magnetic support having magnetic recording layer on one surface thereof, and a backing layer on the surface opposite the magnetic recording layer, the backing layer containing inorganic particles having an average particle size of 0.02 .mu.m or less.

Abstract: A magnetic recording medium such as a video tape comprising a magnetic recording layer which comprises a ferromagnetic metal powder having a specific surface area of not less than 42 m.sup.2 /g and an inorganic material powder having a Mohs' scale of hardness of not less than 5, wherein at least 90 wt. % of said inorganic material powder consists of particles having a particle size of 0.1-0.6 .mu.m, 51-85 wt. % of a portion of said particles consisting of particles having a particle size of less than 0.3 .mu.m, and the residual portion consisting of particles having a particle size of not less than 0.3 .mu.m.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support having coated thereon a magnetic layer, the magnetic layer containing (i) ferromagnetic alloy particles having a specific surface area (S.sub.BET) of 48 m.sup.2 /g or more and (ii) inorganic particles having an average particle size of 0.2 .mu.m or less and having a Mohs' hardness of 6 or more in an amount of 10 to 30 wt % based on the total weight of ferromagnetic alloy particles.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support, a magnetic recording layer on one side of the support, and a backing layer on the opposite side of the support to the magnetic recording layer, wherein said backing layer comprising a binder and a powder dispersed in the binder, wherein the powder is a powdered oxide represented by the formula M.sup.1.M.sup.2.O.sub.2+x (wherein M.sup.1 is at least one element selected from the group consisting of Ba, Sr, Pb and Ca, M.sup.2 is at least one element selected from the group consisting of Ti, Zr and Sn, and x is in the range of from 0 to 0.9) or a mixture of said powdered oxide and carbon black. This magnetic recording medium has a decreased coefficient of friction, is free from formation of scratches, has good durability, and furthermore, maintains good S/N characteristics.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support having coated thereon on opposite surfaces a magnetic layer containing a magnetic substance and a binder-containing backing layer, wherein the magnetic layer has a light transmittance of 2% or more for light having a wavelength of 900 nm, the backing layer has a transmittance of from 1 to 10% for light having a wavelength of 900 nm, the magnetic recording medium as a whole has a transmittance of 1% or less for light having a wavelength of 900 nm, and the backing layer has a center line average roughness (Ra) of 0.05 .mu.m or less at a cut-off value of 0.08 mm.

Abstract: A magnetic recording medium including a nonmagnetic support having a magnetic layer on one side thereof and a backing layer on the opposite side thereof, said backing layer comprising a fatty acid having 12 or more carbon atoms and copper or copper ions. Fatty acid is saturated or unsaturated, and copper is 0.2 micron or less in size.

Abstract: This invention provide a magnetic recording medium with well-balanced excellent properties as to video head abrasion, still life, video S/N and drop out, which comprises a non-magnetic support and a magnetic recording layer containing a ferromagnetic powder, a binder and (A) at least one inorganic compound powder selected from the group consisting of Cr.sub.2 O.sub.3, SiC and mixtures thereof and (B) at least one inorganic compound powder selected from the group consisting of Al.sub.2 O.sub.3, TiO.sub.2, SiO.sub.2, ZnO and mixtures thereof.

Abstract: A magnetic recording medium having an improved surface smoothness of the coating layer, improved degree of orientation in a magnetic field and increased output is provided which comprises a non-magnetic support and a magnetic recording layer provided thereon containing a ferromagnetic substance of plate-shaped hexagonal system, and having a surface gloss value of 180% or more.

Abstract: A magnetic recording medium is disclosed. The medium is comprised of a support base having provided thereon a non-magnetic metal layer and a magnetic layer. The magnetic layer is comprised of plate-shaped magnetic particles having an axis of easy magnetization perpendicular to the plane of the plate-shaped magnetic particles dispersed in a binder. The non-magnetic metal layer is preferably comprised of a metal selected from the group consisting of Al, Cu, Zn, Sn, Ti and alloys thereof. The recording medium has high S/N ratio, reduced drop out, high output, excellent durability and running properties.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing magnetic particles and a binder, wherein the magnetic particles comprise (1) ferromagnetic hexagonal crystallized tabular shape particles having an axis of easy magnetization in a direction vertical to the tabular plane thereof and (2) ferromagnetic ellipsoidal particles having an acicular ratio (length/width) of 1.5/1 to 10/1 and having a saturation magnetization of 60 emu/g or more.

Abstract: A magnetic recording medium is disclosed. The medium comprises a non-magnetic support having provided thereon a magnetic layer comprising a binder, a magnetic powder and a powder of an oxide represented by the formula:M-1.multidot.M-2.multidot.O.sub.2+xwherein M-1 is at least one of barium, strontium, lead and calcium; M-2 is at least one member of titanium, zirconium and tin; and x represents a number of from 0 to 0.9. The medium has a high S/N ratio and improved wear resistance and causes only moderate wear of a magnetic head.

Abstract: A tape for cleaning magnetic head comprising a support and a cleaning layer coated on said support which contains an abrasive comprising a ferromagnetic metal powder of a specific surface area in the range of 40 to 65 m.sup.2 /g as a principal component, the surface of said cleaning layer having a surface of center line average height in the range of 0.02 to 0.04 .mu.m at a cut-off value of 0.08 mm.

Abstract: A magnetic recording medium is disclosed which comprises a non-magnetic support having provided thereon a magnetic recording layer and a backing layer on the opposite surface thereof, wherein said magnetic recording layer contains a fatty acid, said backing layer contains a cellulose resin, and said non-magnetic support has a Young's modulus of 7.times.10.sup.10 to 1.times.10.sup.13 dyn/cm.sup.2.

Abstract: A magnetic recording medium is disclosed. The medium is comprised of a non-magnetic support base having a surface with a center line average loughness (Ra) of not more then 0.035 .mu.m, having coated thereon a magnetic layer. The magnetic layer is comprised of a ferromagnetic powder, a fatty acid ester and two types of carbon black dispersed in a binder. The first type of carbon black has an average primary particles sizes of 10 to 30 m.mu.. The second type of carbon black has an average primary particle size of 60 to 120 m.mu.. The first type of carbon black and second type of carbon black are present in a mixing weight ratio in the range of 60/40 to 95/5. The magnetic recording medium has excellent electromagnetic properties and provides a tape having good running property and durability.

Abstract: A magnetic recording medium is disclosed which comprises a non-magnetic support having provided thereon a magnetic layer, the magnetic layer comprising a first magnetic layer provided on the non-magnetic support containing ferromagnetic alloy particles and a second magnetic layer provided on the first magnetic layer containing hexagonal crystallized ferrite type magnetic particles, wherein the second magnetic layer has a thickness of 0.5 .mu.m or less.

Abstract: A magnetic recording medium comprising a nonmagnetic supporting substrate and a magnetic layer provided thereon by a binder, said magnetic layer contains a ferromagnetic alloy powder having a specific surface area (S.sub.BET) of no less than 45 m.sup.2 /g, and copper oleate in an amount of no less than 0.001 part by weight per 100 parts by weight of said ferromagnetic alloy powder.

Abstract: A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic particles and a binder, wherein said ferromagnetic particles have a tabular ratio (table diameter/table thickness) of 2 or more, a table diameter of from 0.01 to 10 .mu.m, and a lamination degree of the magnetic particles in the magnetic layer in a cross-section thereof of 2 or more.