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:
Apr. 01, 1997
Filed:
May. 10, 1994
TDK Corporation, Tokyo, JP;
Abstract
A magnetic recording medium includes a non-magnetic base film, and a magnetic layer on one surface thereof and a back coat layer on the other surface thereof. The back coat layer contains two kinds of carbon blacks varying in the average particle diameter, and a binder containing two kinds of copolymers. These two copolymers comprise vinyl chloride, alkylcarboxylic acid vinyl ester and vinyl alcohol, one being a copolymer A having an average polymerization degree of 300 to 600, and the other a copolymer B having an average polymerization degree of 200 to 800. This makes it possible to achieve a magnetic recording medium having a back coat layer, which is excellent in surface properties and electromagnetic characteristics, and has high running stability and durability.