The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 2018
Filed:
Sep. 12, 2008
Kunihiro Imai, Nagano, JP;
Takako Matsumoto, Nagano, JP;
Takeshi Watanabe, Nagano, JP;
Akira Furuta, Nagano, JP;
Kazuhiro Kusakawa, Yamanashi, JP;
Masami Kuroda, Kanagawa, JP;
Kunihiro Imai, Nagano, JP;
Takako Matsumoto, Nagano, JP;
Takeshi Watanabe, Nagano, JP;
Akira Furuta, Nagano, JP;
Kazuhiro Kusakawa, Yamanashi, JP;
Masami Kuroda, Kanagawa, JP;
FUJI ELECTRIC CO., LTD., Kawasaki-Shi, JP;
Abstract
A magnetic recording medium includes a nonmagnetic substrate and at least a magnetic layer, a protective layer, and a lubricating layer provided on the nonmagnetic substrate. The magnetic recording medium is characterized in that the lubricating layer is formed of a lubricating agent represented by general formulas (1), (2) or (3), in which substituents R, R, R, and Rin the lubricating agent represent organic groups, at least one of the substituents Rand Rat the end part of the lubricating agent and the substituents Rand Rcontain a plurality of functional groups, and the shortest distance between the functional groups is a distance of three or more atoms, preferably five atoms. The magnetic recording medium may be used for a heat assisted recording method in which the temperature of the magnetic layer reaches 150° C. to 200° C. The magnetic recording medium is characterized in that the amount of the lubricating agent volatilized in the lubricating layer is less than 10% of the initial layer thickness.