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Patent Searching and Data


Title:
MAGNETIC RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2021/033337
Kind Code:
A1
Abstract:
[Problem] The purpose of the present invention is to provide a magnetic recording medium which has excellent running stability and a thin overall thickness. [Solution] The present technology provides a tape-like magnetic recording medium which comprises a magnetic layer, a foundation layer, a base layer and a back layer, wherein: the number of recesses having a depth of 20% or more of the thickness of the magnetic layer is from 10 to 200 per a surface area of 1,600 μm2; the base layer contains a polyester as a main component; the back layer-side surface has a kurtosis of from 2.0 to 4.4; the magnetic recording medium has an average thickness tT of 5.6 μm or less; the magnetic recording medium contains a lubricant, while having pores; and the average diameter of the pores is from 6 nm to 11 nm if measured after removing the lubricant from the magnetic recording medium and drying the magnetic recording medium.

Inventors:
YAMAGA MINORU (JP)
Application Number:
PCT/JP2019/039185
Publication Date:
February 25, 2021
Filing Date:
October 03, 2019
Export Citation:
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Assignee:
SONY CORP (JP)
International Classes:
G11B5/706; G11B5/584; G11B5/70; G11B5/73; G11B5/735; G11B23/037
Domestic Patent References:
WO2019159466A12019-08-22
Foreign References:
JP2017228328A2017-12-28
JP2009087468A2009-04-23
JP2002208130A2002-07-26
JP2007273036A2007-10-18
JP2006099919A2006-04-13
Attorney, Agent or Firm:
WATANABE Kaoru (JP)
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