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:
Aug. 10, 1993
Filed:
Jun. 13, 1991
Kazunori Sakamoto, Katano, JP;
Yukihiro Shimasaki, Sanda, JP;
Yuji Mido, Higashiosaka, JP;
Akira Kisoda, Moriguchi, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A magnetic coating composition prepared by a method comprising a wetting step for wetting powder materials including a magnetic powder with a small amount of a solvent in a kneading machine having an agitation means in a closed container, a first kneading step comprising adding an amount of a binder resin and an amount of a solvent to a mixture from the wetting step and mixing and kneading it, a second kneading step comprising continuously adding the solvent till a consumed power of a kneading apparatus reaches maximum, a third kneading step comprising stopping the addition of the solvent at the maximum consumed power and further kneading the mixture, and a dilution step comprising gradually adding the solvent to the mixture while applying shear force, in which composition, the magnetic powder is highly dispersed and which provides a coating type magnetic recording medium having good properties.