Showa Denko K.k.

Showa Denko Hd Singapore Pte. Ltd.

Ichiro Ota

Hiroyuki Tomita

Katsumi Murofushi

Naoko Ito

Naoya Fukumoto

Yuta Yamaguchi

Ryuuta Miyasaka

Hiroko Hattori

Tsuyoshi Kato

Daisuke Yagyu

Yoshishige Okuno

Takuya Minami

Shoko Uetake

Michio Seri

A fluorine-containing ether compound of the present invention is represented by the following General Formula (1). (In the General Formula (1), X is a trivalent atom or a trivalent atom group, A is a linking group including at least one polar group, B is a linking group having a perfluoropolyether chain, and D is a polar group or a substituent having a polar group at the end.)[Chem. 1]XA-B-D)&#x2003;&#x2003;(1)

Magnetic recording medium, fluorine-containing ether compound and lubricant for magnetic recording medium

A lubricant for a magnetic recording medium capable of forming a lubricant layer having excellent adhesion to a protective layer is provided. A lubricant for a magnetic recording medium contains a fluorine-containing ether compound in which a group having an ethylenic carbon-carbon double bond is disposed at one or both terminals of a perfluoroalkyl polyether chain. It is preferable that the group having the ethylenic carbon-carbon double bond is disposed at one terminal of the perfluoroalkyl polyether chain, and a hydroxyl group is disposed at other terminal. It is preferable that the lubricant for a magnetic recording medium contains a compound in which one or more functional groups selected from a hydroxyl group, an amino group, an amido group and a carboxyl group is disposed at one or both terminals of a perfluoroalkyl polyether chain.

Lubricant for magnetic recording medium, and method for producing magnetic recording medium

A fluorine-containing ether compound represented by a formula (1) shown below.R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2003;&#x2003;(1) In formula (1), Rand Rrepresent the same or different perfluoropolyether chains, Rrepresents a linking group containing at least one polar group, one or both of Rand Rrepresent a terminal group containing two or more polar groups, and Rand Rare different.

Fluorine-containing ether compound, lubricant for magnetic recording medium and magnetic recording medium

The present invention relates to a fluorine-containing ether compound represented by Formula (1),R&#x2014;R&#x2014;CH&#x2014;R&#x2014;CH&#x2014;R&#x2003;&#x2003;(1).(In Formula (1), Ris an end group including an organic group having at least one double bond or triple bond, Ris a divalent linking group bonded to Rby etheric oxygen, Ris a perfluoropolyether chain, Ris an end group having two or three polar groups with each polar group being bonded to different carbon atoms, and the carbon atoms, to which the polar groups are bonded, being bonded to each other via a linking group including carbon atoms to which the polar groups are not bonded.)

Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium

A carbon film forming method, that introduces a raw material gas including carbon into a film forming chamber, ionizes the gas by using an ion source, accelerates the ionized gas, and radiates the ionized gas to a surface of a substrate to form a carbon film on the surface of the substrate, includes forming the carbon film while rotating a first magnet, which is provided on the opposite side of the substrate across a region in which the raw material gas is ionized so as to be eccentric and/or inclined with respect to a central axis connecting the center of the ion source and a position corresponding to the center of the substrate held by the holder, in a circumferential direction.

Carbon film forming apparatus, carbon film forming method, and magnetic recording medium manufacturing method

A method of fabricating a magnetic recording medium sequentially forms a magnetic recording layer, a protection layer, and a lubricant layer on a stacked body. The lubricant layer is formed on a surface of the protection layer by vapor-phase lubrication without exposing the stacked body to atmosphere after forming the protection layer on the stacked body. Nitrogen atoms or oxygen atoms are injected onto the surface of the protection layer after forming the protection layer and before forming the lubricant layer.

Magnetic recording medium fabrication method and apparatus

A carbon film forming method including a step in which, inside a film formation chamber provided with a filamentous cathode electrode, an anode electrode disposed around the perimeter of the cathode electrode, and a substrate holder disposed at a position that is separated from the cathode electrode, a disk-like substrate that has a central aperture is disposed in the substrate holder so that one surface of the substrate is opposite the cathode electrode, and a columnar member that has a diameter equal to or greater than a diameter of the central aperture and that has a height equal to or greater than the diameter is disposed with clearance from the cathode electrode and the substrate so that its central axis is coaxial with a central axis of the substrate, one of its circular surfaces is oriented toward the cathode electrode, and its other circular surface is parallel to the one surface of the substrate; and a step in which carbon film is formed on the one surface of the substrate by causing emission of carbon ions from the cathode electrode side toward the substrate side after the interior of the film formation chamber has been evacuated.

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Chiba, Japan

Ichiro Ota