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. 24, 2013
Filed:
Sep. 14, 2007
Hisanobu Mikamo, Osaka, JP;
Hidekazu Kawatoko, Osaka, JP;
Makoto Shiokawa, Osaka, JP;
Shinji Kawakami, Osaka, JP;
Masanori Yamasaki, Osaka, JP;
Hitoshi Tsukamoto, Osaka, JP;
Sadamu Kuse, Osaka, JP;
Hisanobu Mikamo, Osaka, JP;
Hidekazu Kawatoko, Osaka, JP;
Makoto Shiokawa, Osaka, JP;
Shinji Kawakami, Osaka, JP;
Masanori Yamasaki, Osaka, JP;
Hitoshi Tsukamoto, Osaka, JP;
Sadamu Kuse, Osaka, JP;
Hitachi Maxell, Ltd., Ibaraki-Shi, Osaka, JP;
Abstract
A method for manufacturing a magnetic recording medium of the present invention includes a magnetic layer forming step in which a drying process is performed. The drying process includes: a pre-heating stage in which a magnetic coating film is heated until the surface temperature of the magnetic coating film stops rising and reaches a substantially constant temperature; a constant rate drying stage that is performed after the pre-heating stage in which the surface temperature of the magnetic coating film is held substantially constant; and a falling rate drying stage that is performed after the constant rate drying stage in which the surface temperature of the magnetic coating film is increased to be higher than the surface temperature during the constant rate drying stage to harden the magnetic coating film. The constant rate drying period in which the constant rate drying stage is performed is 0.2 seconds or more. The first solvent is made of one solvent or two or more solvents having different boiling points, and the difference (T−T) between the boiling point Tof the solvent having the lowest boiling point among the solvents contained in the first solvent and the surface temperature Tof the magnetic coating film during the constant rate drying period is 1 to 50° C.