Title:
LUBRICANT COMPOSITION
Document Type and Number:
Japanese Patent JP2021116339
Kind Code:
A
Abstract:
To provide a lubricant composition that maintains an appropriate high-temperature shear viscosity even when viscosity is lowered, has excellent fuel economy and low temperature viscosity characteristics, is preferably a lubricant composition for an internal combustion engine, and is more preferably a lubricant composition for a diesel engine.SOLUTION: The lubricant composition comprises: (A) a lubricating oil base oil, (B-1) polymethacrylate, and (B-2) an α-olefin copolymer, wherein (A) the lubricating oil base oil has a kinematic viscosity of 2.0 to 10.0 mm2/s at 100°C, (B-1) the polymethacrylate has a weight average molecular weight of 100,000 to 400,000, the content of the polymethacrylate is 0.5 to 5.0 mass% with respect to the total mass of the lubricant composition, (B-2) the α-olefin copolymer has an SSI (shear stability index) of 20 to 30, an amount of the olefin copolymer is 0.5 to 8.0 mass% with respect to the total mass of the lubricant composition, the lubricant composition has a kinematic viscosity of 6.9 or more to less than 9.3 mm2/s at 100°C, and has a CCS viscosity of 6.2 Pa s or less at -35°C, and the lubricant composition has a high temperature and high shear viscosity (HTHS viscosity) of 2.6 mPa s or more at 150°C.SELECTED DRAWING: None
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Inventors:
ARAI MASAHIRO
SUZUKI HIROYUKI
SUZUKI HIROYUKI
Application Number:
JP2020010030A
Publication Date:
August 10, 2021
Filing Date:
January 24, 2020
Export Citation:
Assignee:
EMG LUBRICANTS GK
International Classes:
C10M169/04; C10M101/02; C10M105/04; C10M143/00; C10M145/14
Attorney, Agent or Firm:
Mitsuo Matsui
Hiroshi Murakami
Yukari Kato
Hiroshi Murakami
Yukari Kato