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:
Dec. 31, 1985
Filed:
May. 25, 1984
Shozo Kikukawa, Akigawa, JP;
Yoshitaka Yasufuku, Hino, JP;
Konishiroku Photo Industry Co., Ltd., Tokyo, JP;
Abstract
A magnetic recording medium comprising a support and provided thereon a magnetic layer containing magnetic powder and a copolymer capable of being soluble in water by 10 parts by weight or more per 100 parts by weight of water. Further, a process of preparing a magnetic recording medium wherein magnetic powder is treated with a copolymer capable of dissolving 10 parts by weight or more per 100 parts by weight of water in an aqueous medium under presence of a metal ion and a magnetic paint containing this treated magnetic powder is coated on base to form a magnetic layer is also provided. Further a process of preparing a magnetic recording medium wherein magnetic powder emulsion that has been pretreated for a higher coercive force is filtered to separate unnecessary materials from magnetic powder and said magnetic powder is surface treated in an aqueous medium with a copolymer capable dissolving 10 parts by weight or more per 100 parts by weight of water, and a magnetic paint comprising this surface treated magnetic powder is coated on base to form a magnetic layer.