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. 03, 1992
Filed:
Jun. 26, 1990
Mikihiko Kato, Kanagawa, JP;
Yasushi Endo, Kanagawa, JP;
Yasuo Nagashima, Kanagawa, JP;
Hiroshi Hashimoto, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium is disclosed, comprising a nonmagnetic support having thereon a magnetic layer comprising ferromagnetic metal particles and binder resins, in which 35 to 55% by weight of said binder resins are a polar group-containing vinyl chloride copolymer and 10 to 25% by weight of said binder resins are a polyurethane resin obtained by the reaction of a polyisocyanate with a polyester polyol that is a product of the reaction of at least one of an alicyclic dihydric alcohol and an aromatic dihydric alcohol with at least one of an alicyclic dicarboxylic acid and an aromatic dicarboxylic acid, said polyurethane resin containing a polar group selected from the group consisting of --SO.sub.3 M, --COOM, --PO.sub.3 M wherein M is an H, Na, or K atom, and --NH.sub.2 in an amount of from 0.03 to 2% by weight, the amount of said binder resin in the magnetic layer being from 15 to 30 parts by weight per 100 parts by weight of said ferromagnetic metal particles.