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. 30, 1982
Filed:
Mar. 03, 1980
Takeshi Matsuura, Kyoto, JP;
Seiji Watatani, Takatsuki, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magnetic recording medium, prevented from blooming of the lubricants therein even after used at a high temperature under a high humidity for a long period of time and excellent in abrasion resistance and durability, comprising an elastic base sheet and a magnetic layer containing magnetic powders and a binder, characterized in that the magnetic layer further contains (A) at least one of esters of saturated aliphatic acids having 18 carbon atoms with aliphatic alcohols having 3 to 6 carbon atoms, (B) at least one of saturated aliphatic acids having 14 to 18 carbon atoms and (C) at least one of zinc salts of saturated aliphatic acids having 14 to 18 carbon atoms, the content of the component (A) being from 0.5 to 2.0% by weight based on the weight of the magnetic powders in the magnetic layer, the content of the component (B) being from 1/4 to 1 part by weight to one part by weight of the component (A) and the content of the component (C) being from 1/3 to 1 part by weight to one part by weight of the combined amount of the components (A) and (B).