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. 05, 2000
Filed:
Apr. 09, 1998
Sony Corporation, Tokyo, JP;
Abstract
An object of the present invention is to impart good running stability and durability to a magnetic recording medium comprising a combination of a polyester polyurethane resin and a phenox resin as a binder for a magnetic layer of a coating type magnetic recording medium while ensuring excellent static magnetic properties. In order to achieve the object, the present invention provides a coating type magnetic recording medium having a magnetic layer formed on a nonmagnetic support and containing a magnetic powder, a binder and a lubricant, wherein a combination of a polyester polyurethane resin and a phenox resin is use as the binder, a combination of a polyhydric alcohol ester and silicone oil is used as the lubricant, and the surface extraction of the lubricant from the coating type magnetic recording medium is 3.0.times.10.sup.-3 to 3.0.times.10.sup.-2 g/m.sup.2.