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:
Jan. 09, 1996
Filed:
Jun. 15, 1993
Applicant:
Inventors:
Masahiro Yamakawa, Kawasaki, JP;
Katsuya Nakamura, Tokyo, JP;
Assignee:
Nippon Zeon Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
4284259 ; 4286 / ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 252 6254 ;
Abstract
According to this invention, there is provided a binder containing a polyurethane resin having an urethane bond and formed by the reaction of a diisocyanate and a polyol, said resin containing on the average at least 2.3 isocyanate groups in a molecule, having a number average molecular weight of at least 2,000 but at most 10,000 and containing less than 20% of a component having a molecular weight of at most 1,000; a magnetic recording layer or back coat layer using same; and a magnetic recording medium having same. Said magnetic recording medium is excellent in magnetic characteristics, durability and running property.