Lubricant for recording medium and magnetic disk

The present invention provides a lubricant for recording media that does not readily decompose, and which has high adhesion to recording media, and a magnetic disk that is durable against continuous sliding under high-speed rotation. The present invention provides a lubricant for recording media con...

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Bibliographische Detailangaben
Hauptverfasser:	SAKANE YASUO, WAKABAYASHI AKINOBU
Format:	Patent
Sprache:	eng
Schlagworte:	INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
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Beschreibung
Zusammenfassung:	The present invention provides a lubricant for recording media that does not readily decompose, and which has high adhesion to recording media, and a magnetic disk that is durable against continuous sliding under high-speed rotation. The present invention provides a lubricant for recording media containing: a perfluoropolyether compound represented by Formula (1), R1-CH2CF2O-(CF2CF2O)m-(CF2O)n-CF2CH2-R2 (1) wherein R1 represents R represents a C1-4 haloalkyl group, R2 represents -OCH2CH(OH)CH2OH, and m and n are each independently 1-30; and another perfluoropolyether compound represented by Formula (2), R1-CH2CF2O-(CF2CF2O)m-(CF2O)n-CF2CH2-R3 (2) wherein R1, m and n are as defined above and R3 represents -OCH2CH(OH)CH2OCH2CH(OH)CH2OH. The present invention also provides a magnetic disk having a lubricating layer essentially consists of such a lubricant.