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:
Apr. 23, 1996
Filed:
Dec. 01, 1994
TDK Corporation, Tokyo, JP;
Abstract
A first object of the invention is to provide a magnetic recording medium having minimized dropouts immediately after preparation, a reduced dropout increase and an electromagnetic property loss with the lapse of time, and good durability of coatings such as a magnetic layer. A second object is to provide a magnetic recording medium including a backcoat layer having high durability and antistatic effect in addition to the above advantages. A third object is to achieve a productivity increase and a cost reduction in the manufacture of such a magnetic recording medium. To attain these objects, the invention provides a method for preparing a magnetic recording medium comprising a kneading step of kneading solids and a binder solution, a dispersing step of dispersing the solids in the compound resulting from the kneading step, and a viscosity adjusting step of adding a viscosity adjusting solution to the dispersion resulting from the dispersing step to form a paint composition wherein filtering steps are included after the steps for filtering fluids to be filtered (including the binder solution, compound, dispersion, viscosity adjusting solution, and paint) and a filter means having a 95% cut filtration precision within a specific range is used in each of the filtering steps.