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:
Nov. 29, 1988
Filed:
Apr. 20, 1987
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic fine particles dispersed in a binder including a polyurethane resin containing (1) as a main polymer chain a polyester polyol containing an alcoholic and acid components comprising at least one of (A) at least one alcoholic component selected from alicyclic divalent alcohol and aromatic divalent alcohol in an amount of 50 mol % or more based on the total amount of alcoholic components or (B) at least one acid component selected from alicyclic dicarboxylic acid and aromatic dicarboxylic acid in an amount of 50 mol % or more based on the total amount of acid components, and (2) at least one polyisocyanate selected from tolylene diisocyanate, diphenyl-methane-4,4'-diisocyanate, isophrorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, and p-phenylene diisocyanate in an amount of 5 mol % or more based on the total amount of all alcoholic components and all acid components, and further containing (3) a polar group selected from --SO.sub.3 M, --CO.sub.2 M, and --PO.sub.3 M.sub.2, wherein M represents an H, Na, or K atom, in an amount of from 0.03 to 2 wt % based on the total amount of the polyurethane resin.