LUBRICANT AGENT, AND MAGNETIC DISK DEVICE USING SAME

摘要

Disclosed is a lubricant agent having the structure of a polymeric compound, wherein the structure has a polar group or a side chain having a polarity at the terminal of the main chain skeleton and at least one middle site of the main chain skeleton and also has a non-polar side chain at the terminal of the main chain skeleton or a middle site of the main chain skeleton. For example, the polar group or the side chain having a polarity to be employed is any one group selected from the groups -OH, -CH2OH, -COOH, -NH2 and -CH2OCH2CH(OH)CH2OH, and the non-polar side chain to be employed is a side chain having a structure represented by formula (5) or (6). It becomes possible to provide a lubricant agent that can be used for a magnetic disk device, which is characterized in that the film thickness of a single-molecule membrane of the lubricant agent is maintained at a lower level and the surface energy of the single-molecule membrane is reduced, and which can stabilize a head/disk interface in a magnetic disk device for a long period. -(CF2O)P-CF3 (5) -(CF2)P-CF3 (6) [In the formulae (5) and (6), P represents an integer of 0 or greater.]