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:
Mar. 03, 1992
Filed:
Feb. 28, 1990
Kunihiko Sano, Kanagawa, JP;
Hiroaki Doushita, Kanagawa, JP;
Kiyomi Ejiri, Kanagawa, JP;
Hiroyuki Tahara, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon a magnetic layer comprising ferromagnetic particles and a binder containing a vinyl chloride polymer, wherein the crystallite size of the ferromagnetic particles is 250 angstrom or less, the vinyl chloride polymer is present in an amount of 20 to 50% by weight based on the binder, and an integrated intensity ratio, which is denoted by .alpha., of Cl-2P spectrum to Fe-2P (3/2) spectrum in the surface of the magnetic layer as measured by X-ray photoelectron spectroscopy is 0.20/1<.alpha.<0.42/1. The magnetic recording material exhibits excellent running property and durability and hardly causes head clogging.