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:
May. 09, 1995
Filed:
Apr. 28, 1993
Hiroshi Murata, Ohtsu, JP;
Takeshi Yatsuka, Ohtsu, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
According to the present invention, a magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon is provided. The magnetic layer is formed from a composition containing as its main components ferromagnetic particles and a resinous binder. The binder resin contains a polyurethane resin containing as its components a high molecular weight polyol (A) with a molecular weight of 500 or more and an organic diisocyanate (B). The high molecular weight polyol (A) contains as its components an aromatic polyester diol (A-1) having a metal sulfonate group in an amount of 20 to 600 equivalents/10.sup.6 g and a polyol (A-2) which has no metal sulfonate group and is in a liquid state at 20.degree. C. The ratio between the aromatic polyester diol (A-1) and the polyol (A-2) is in the range of 10:1 to 1:4. A urethane group is contained in the polyurethane resin in an amount of 600 to 1500 equivalents/10.sup.6 g.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile