A base member serves as a part of a housing of a hard disk drive device. The base member includes a base body being a cast product, a first machined surface obtained by machining a portion formed with a convex portion of the base body, and a coating film covering a surface of the base body. The base body includes a coated surface obtained by covering the first machined surface with the coating film, and a second machined portion obtained by machining a part of the base body other than the first machined surface.

A method for forming a printed material includes forming an image on a recording medium; applying particles to a surface of the recording medium, the surface having the image formed thereon; heating the particles applied to the recording medium; and pressurizing, in a thickness direction, a multilayer body obtained by folding the recording medium so that the heated particles are sandwiched between flaps of the recording medium or a multilayer body obtained by placing another medium on top of the recording medium with the heated particles therebetween. The particles contain a styrene resin and a (meth)acrylic acid ester resin. The (meth)acrylic acid ester resin contains two (meth)acrylic acid ester monomer units, and a mass ratio of the (meth)acrylic acid ester monomer units relative to a total of polymerization components is 90 mass % or more.

A method for forming a printed material includes forming an image on a recording medium; applying particles to a surface of the recording medium, the surface having the image formed thereon; heating the particles applied to the recording medium; and pressurizing, in a thickness direction, a multilayer body obtained by folding the recording medium so that the heated particles are sandwiched between flaps of the recording medium or a multilayer body obtained by placing another medium on top of the recording medium with the heated particles therebetween. The particles contain a styrene resin and a (meth)acrylic acid ester resin. The (meth)acrylic acid ester resin contains two (meth)acrylic acid ester monomer units, and a mass ratio of the (meth)acrylic acid ester monomer units relative to a total of polymerization components is 90 mass % or more.

A problem to be solved by the present invention is to provide a magnetic recording medium having a jet-black magnetic stripe which is not tinged with red. The present invention is directed to a magnetic recording medium including: a magnetic recording layer on a substrate; and a protective layer (a) on the magnetic recording layer, wherein the protective layer (a) contains an aniline coloring material. The magnetic recording medium is advantageous in that the magnetic stripe is jet-black and has excellent design properties, and therefore can be widely used for credit cards, bank cards and the like.

Described are magnetic recording heads that include an overcoat that includes a titanium oxynitride (TiON) layer.

Described are magnetic recording heads that include an overcoat that includes a titanium oxynitride (TiON) layer.

A photocurable gasket resin composition for use in a hard disk drive contains an acryloyl-terminated polyisobutylene, a monofunctional alkyl (meth)acrylate monomer, a polyethylene powder, a phosphate ester, a polyfunctional secondary thiol, a thixotropy-imparting agent, and a photopolymerization initiator. The monofunctional alkyl (meth)acrylate monomer contains a chain skeleton alkyl (meth)acrylate of C8 to C18 and dicyclopentenyl acrylate. The thixotropy-imparting agent contains a compound (f1) derived from castor oil.

To provide a magnetic recording tape and the like that have excellent magnetic properties and exhibit a favorable SNR. There are provided a magnetic recording tape and the like including at least: a base layer that includes a long film having flexibility; and a magnetic layer formed on a side of one main surface of the base layer, in which an under layer and a seed layer are provided in the stated order from a side of the magnetic layer toward a side of the base layer between the magnetic layer and the base layer, the underlayer contains at least Co and Cr, and has an average atomic number ratio represented by the following formula (1): Co.sub.(100-y)Cr.sub.y (where y is within a range of 37≤y≤45.), and the seed layer formed directly on the base layer has a film thickness of 5 nm or more and 30 nm or less, and contains Ti and O and has an average atomic number ratio represented by the following formula (2): Ti.sub.(100-x)O.sub.x (where x≤10.) or contains Ti—Cr—O and has an average atomic number ratio represented by the following formula (3): (TiCr).sub.(100-x)O.sub.x (where x≤10.).

A method of protecting a magnetic layer of a magnetic recording medium is provided to reduce the thickness of the magnetic spacing while improving corrosion resistance and tribological performance of the magnetic recording medium.

A recording device comprising an overcoat layer, wherein the overcoat layer comprises an amorphous carbon overcoat layer having a crystallinity (C)≤0.8.