磁気記録媒体

Japanese Patent JP7388172

B2

To provide a magnetic recording medium that is thin in overall thickness with running stability excellent.SOLUTION: A tape-shape magnetic recording medium 10 includes: a magnetic layer 13; a ground layer 12; a base layer 11; and a back layer 14. Kurtosis of a surface on a magnetic layer side is equal to or more than 3.0, kurtosis of a surface on a back layer side is equal to or more than 2.0, and arithmetic mean roughness Ra of a surface on the magnetic layer side is equal to or less than 2.5nm. The base layer includes polyester as a main component, and an average thickness tT of the magnetic recording medium is equal to or less than 5.6 μm. The magnetic recording medium includes a lubricant. The lubricant contains a fatty acid, and a fatty acid ester, and a mass ratio of the fatty acid and fatty acid ester to be extracted by hexane is the fatty acid/fatty acid ester≤0.6. The magnetic recording medium has a pore, and an average diameter of the pore is equal to or more than 6nm and equal to or less than 11nm when removing the lubricant from the magnetic recording medium and measuring the magnetic recording medium in a dried condition.SELECTED DRAWING: Figure 1

Minoru Yamaga
Takanobu Iwama
Jun Takahashi

JP2019228050A

November 29, 2023

December 18, 2019

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Sony Group Corporation

G11B5/70; C10M105/24; C10M105/34; G11B5/584; G11B5/706; G11B5/71; G11B5/714; G11B5/73; G11B5/735; G11B5/738; G11B5/78; G11B15/43; G11B23/30

JP2006065953A
JP2004273070A
JP2009087468A
JP2000215433A
JP2019003712A
JP2016139451A
JP2004005891A
JP2007299513A
JP2007273036A
JP2006099919A

WO2019159466A1

Kaoru Watanabe

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