HYDRAULIC OIL COMPOSITION
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United States of America Patent
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Issued Date -
Apr 28, 2016
app pub date -
Jun 24, 2014
filing date -
Jun 24, 2013
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Abstract
The present invention provides a hydraulic oil composition comprising a lubricating base oil having a kinematic viscosity at 40° C. of 15 to 50 mm2/s, a viscosity index of 125 or lower, and an aromatic content of 1% by mass or higher; and 1 to 40% by mass based on a total amount of the hydraulic oil composition of a polymethacrylate having a number-average molecular weight of 28000 or lower.
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