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:
Jun. 06, 1995
Filed:
Oct. 12, 1993
Eitaro Nakamura, Tokyo, JP;
Katsuya Nakamura, Tokyo, JP;
Nippon Zeon Company, Ltd., Tokyo, JP;
Abstract
The present invention provides a magnetic recording medium excellent in S/N ratio and durability. The magnetic recording medium is characterized in that a magnetic powder having a relative surface area of at least 35 m.sup.2 /g and an average adsorption of myristic acid of up to 0.5 mg/m.sup.2 in methylethylketone solution of an average concentration of 0.6 g/100 ml, on the one hand, and a magnetic layer comprising a bond having at least one hydrophilic group selected from among SO.sub.3 M, SO.sub.4 M, PO.sub.4 M.sub.2 and N.sup.+ R.sup.1 R.sup.2 R.sup.3 X.sup.- and at least one reactive group selected from among hydroxide group, thiol group, amino group and epoxy group, on the other hand, is bridged by at least one briding agent selected from among polyisocyanate, polyamine and polythiol.