Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A blade coating method using a plurality of blades for applying coating liquid on surfaces of disk-like flat substrates to thereby form coating layers on to-be-coated surfaces of the flat substrates respectively, the method comprising: the attaching step as defined herein; and the moving step as defined herein; wherein after a first one of the blades applies the coating liquid on a surface of a disk-like flat substrate in a direction, the first blade retracts and a second one of the blades applies the coating liquid on a surface of a next disk-like flat substrate in a direction reverse to the direction applied by the first blade.

Abstract: The present invention provides a method for manufacturing a disc-shaped information medium that has, on a substrate, a printable layer containing at least a base layer and an ink-receiving layer. The method comprises, performing a liquid spread prevention treatment at an outer peripheral region, which is from an outer peripheral end portion of the substrate to an outer peripheral end portion of the ink-receiving layer; and coating an ink-receiving layer coating liquid for forming the ink-receiving layer onto the base layer to form the printable layer.

Abstract: A blade coating method using a blade for coating a surface of a flat substrate with a coating liquid to form a coating layer on a to-be-coated surface of the flat substrate, the method comprising: the attaching step as defined herein; and the moving step as defined herein, wherein the quantity of the coating liquid remaining in the liquid reservoir on the upstream side of the blade is set to be in a range of from two times to five times as much as a quantity of the coating liquid to be applied on one sheet of the flat substrate with a stroke of the blade.

Abstract: A spin-coat application method wherein a coating liquid is spin-coat applied to a member to be coated in a condition where a processing atmosphere in a spin coater is humidified to a humidity of 60% or more by acidic water of pH 6 or less.

Abstract: A method for manufacturing a disc-shaped information medium that has, on a substrate, a printable layer that includes at least an ink-receiving layer having a thickness in the range of 20 to 50 ?m, the method including coating an ink-receiving layer coating liquid on the substrate to form the ink-receiving layer, and thereafter blowing drying air on a coated surface at a wind speed in the range of 0.5 to 5 m/sec and at a temperature in the range of 10 to 40° C. to perform a drying process and thereby form the printable layer.

Abstract: A blade coating apparatus comprising: a mask having an opening, said mask being overlaid on a flat substrate to be coated; a blade movable relatively to said mask and above said mask to apply a coating liquid onto said mask so that a coating layer is formed on a coating surface of said flat substrate, said coating surface being exposed from said opening; and a water repellent portion which suppresses adhesion of the coating liquid, said water repellent portion being provided on an end face which defines said opening.

Abstract: A blade coating method comprising: laying a mask on top of a flat substrate, the mask having an opening; supplying a coating liquid onto the mask; applying the coating liquid onto the mask by use of a blade moving above the mask and relatively to the mask; and separating the mask and the flat substrate from each other, so as to form a coating liquid layer on the flat substrate in accordance with the opening of the mask; wherein: a relative movement speed between the mask and the flat substrate when the mask and the flat substrate are operated to leave each other is set to be in a range of from 50 mm/sec to 200 mm/sec.

Abstract: Provided is a magnetic recording medium that exhibits excellent electromagnetic characteristics especially in recording and reproducing systems using an MR head, as well as has excellent long-term preservation property. The magnetic recording medium comprises a lower layer comprising a nonmagnetic powder or a ferromagnetic powder and a binder and at least one magnetic layer thereover comprising a ferromagnetic powder and a binder on a support.

Abstract: A magnetic recording medium comprising a non-magnetic support and a magnetic layer containing a binder and a ferromagnetic metal powder dispersed in the binder, wherein the binder contains a polyurethane resin obtained from a polyester polyol, a chain extender, and an organic diisocyanate, and the magnetic layer has a product ? of coercive force Hc (kA/m) in an in-plane, longitudinal direction and magnetic flux Øm (T?m) in a range of from 400 to 800.

Abstract: The present invention relates to an information medium having a printable layer comprising at least a base layer and an ink-receiving layer adjacent to the base layer, characterized in that the surface roughness Ra at the surface of the base layer is 0.05 ?m or greater, and the ink-receiving layer is formed by thermally hardening a composition comprising a cation-modified acrylic copolymer, a polyvinylacetal resin, an epoxy compound and hydrophobic fine particles, the thickness of the ink-receiving layer being 30 ?m to 60 ?m.

Abstract: The present invention provides an information medium including a printable layer containing at least a base layer and a colorant receiving layer, wherein the colorant receiving layer contains at least microparticles, a binder and a cross-linking agent, and has a thickness of 30 to 60 ?m.

Abstract: An information medium comprising a printable layer that comprises at least an undercoat layer and a colorant-receiving layer, wherein the colorant-receiving layer comprises at least fine particles, a binder and a cross-linking agent; and the undercoat layer has a thickness of 15 ?m or more and an information medium comprising a printable layer that comprises at least an undercoat layer and a colorant-receiving layer, wherein the undercoat layer comprises at least a smoothing layer that controls glossiness of the printable layer and a chromaticity control layer that controls chromaticity of the printable layer.