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. 14, 1993
Filed:
Feb. 26, 1990
Katsuya Nakamura, Tokyo, JP;
Eitaro Nakamura, Tokyo, JP;
Nippon Zeon Co., Ltd., Tokyo, JP;
Abstract
Disclosed is a magnetic recording medium having a magnetic layer comprising a vinyl chloride copolymer as a binder and a magnetic powder and formed on a non-magnetic support. The binder is a mixture comprised of (a) a vinyl chloride copolymer having a quaternary ammonium salt and a hydroxyl group and (b) a vinyl chloride copolymer having at least one anionic hydrophilic group selected from carboxylic acids, sulfur-containing acids, phosphorus-containing acids, and salts thereof, and a hydroxyl group. The ratio of copolymer (a) to copolymer (b) is such that the equivalent ratio of the quaternary ammonium salt in copolymer (a) to the anionic hydrophilic group in copolymer (b) is from 0.2 to 5.