发明名称 |
MAGNETIC DISK AND METHOD FOR MANUFACTURING THE MAGNETIC DISK |
摘要 |
Disclosed is a magnetic disk that has high durability, particularly high LUL durability and CFT properties and can exhibit high reliability under a low-levitation level of a magnetic head due to a rapid increase in recording density in recent years and under very high environmental tolerance required due to diversification of applications. The magnetic disk comprises a substrate and at least a magnetic layer, a carbonaceous protective layer, and a lubricating layer provided in this order on the substrate. The lubricating layer is formed of a lubricating agent that contains two types of compounds having a perfluoropolyether main chain in the structure. The molecular weight distribution of the whole two types of compounds is in the range of 1 to 1.2. The two types of compounds include a compound (a) having a hydroxyl group at an end thereof and a compound (b) having a number average molecular weight that is smaller than the number average molecular weight of the compound (a) and is not more than 1500. The content of the compound (b) in the two types of compounds is not more than 10%. |
申请公布号 |
WO2010038773(A1) |
申请公布日期 |
2010.04.08 |
申请号 |
WO2009JP67022 |
申请日期 |
2009.09.30 |
申请人 |
HOYA CORPORATION;HOYA MAGNETICS SINGAPORE PTE. LTD;SHIMOKAWA KOICHI;HAMAKUBO KATSUSHI;ITOH KAE |
发明人 |
SHIMOKAWA KOICHI;HAMAKUBO KATSUSHI;ITOH KAE |
分类号 |
G11B5/725;C10M107/38;C10N20/04;C10N30/00;C10N30/06;C10N40/18;G11B5/84 |
主分类号 |
G11B5/725 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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