MAGNETIC RECORDING DISK AND METHOD FOR MANUFACTURE THEREOF
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United States of America Patent
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Issued Date -
May 28, 2009
app pub date -
Sep 28, 2006
filing date -
Sep 30, 2005
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Abandoned
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Abstract
In a magnetic recording disk 1 including a magnetic layer 12, a protective layer 13, and a lubricating layer 14, the lubricating layer 14 is made from a lubricant prepared from a composition. The weight change of the lubricant ranges from −20% to −50% at 300° C. in the case where the lubricant is subjected to thermogravimetric analysis in such a manner that the lubricant is heated from 40° C. to 500° C. at a heating rate of 10° C./min. The lubricant has a maximum peak at about 300° C. in the case where the lubricant is subjected to differential thermal analysis in the same manner as described above. The lubricant can be quantitatively measured for heat resistance. Therefore, a magnetic recording disk exhibiting stable performance at high temperatures and a method for manufacturing such a magnetic recording disk can be obtained.
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