BEARING LUBRICANT, BEARING AND DISK DRIVE DEVICE
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United States of America Patent
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May 12, 2011
app pub date -
Nov 10, 2009
filing date -
Nov 10, 2009
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Abstract
A bearing lubricant includes a base oil containing an ester compound consisting of 2-ethyl-2-methyl-1,3-propanediol and at least one of carboxylic acids having 5 to 12 carbon atoms, the ester compound being represented by the following formula (1), in which the base oil has a kinetic viscosity at approximately 40° C. of approximately 7 to 15 mPa, and has a pour point of approximately −60° C. or less:where R1 and R2 represent hydrocarbon groups having 4 to 11 carbon atoms.
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