US2016115420A1PendingUtilityA1

Hydraulic oil composition

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Assignee: JX NIPPON OIL & ENERGY CORPPriority: Jun 24, 2013Filed: Jun 24, 2014Published: Apr 28, 2016
Est. expiryJun 24, 2033(~6.9 yrs left)· nominal 20-yr term from priority
Inventors:Kazuhiro Yagishita
C10M 2207/026C10M 2209/084C10M 2203/1025C10M 101/02C10M 169/041C10M 2223/041C10N 2040/08C10N 2020/02C10N 2030/02C10N 2030/40C10N 2020/04C10M 145/14C10M 2203/1006
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Claims

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 mm 2 /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.

Claims

exact text as granted — not AI-modified
1 . A hydraulic oil composition comprising:
 a lubricating base oil having a kinematic viscosity at 40° C. of 15 to 50 mm 2 /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.   
     
     
         2 . The hydraulic oil composition according to  claim 1 , wherein the hydraulic oil composition has a ratio (A/B) of (A) a kinematic viscosity (unit: mm 2 /s) at 80° C. to (B) a high shear viscosity (unit: mPa·s, shear condition: 10 6 /s) at 80° C. of 1.15 or lower.

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