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. 16, 2008
Filed:
Jul. 26, 2004
Katsuhiko Yamazaki, Tokyo, JP;
Tsutomu Ide, Tokyo, JP;
Takashi Handa, Tokyo, JP;
Akinori Nishizawa, Tokyo, JP;
Katsuhiko Yamazaki, Tokyo, JP;
Tsutomu Ide, Tokyo, JP;
Takashi Handa, Tokyo, JP;
Akinori Nishizawa, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
The present invention provides a magnetic recording medium which has a thin film magnetic layer considerably excellent in surface smoothness, and is excellent in electromagnetic conversion property. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 7 to 23 μg of POions are extracted per 10 mmof the volume of the lower non-magnetic layer of the magnetic recording medium. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 8 to 22 μg of Mgions are extracted per 10 mmof the volume of the lower non-magnetic layer of the magnetic recording medium.