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US 10,351,794 B2Granted
Lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsShinji Aoki, Tadashi Kisen
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Abstract
A lubricating oil composition prepared by blending a base oil (A) containing a compound (A1) that is an ester or ether and has two or more aromatic rings, with a polyalkylene glycol (B) is provided. The lubricating oil composition has a high density (i.e., a high bulk modulus), a high viscosity index, and excellent shear stability.
Claims15
A lubricating oil composition prepared by blending a base oil (A) with a polyalkylene glycol (B), wherein:
- the base oil (A) comprises a compound (A 1) that is an ester or ether and has two or more aromatic rings;
- a content of the polyalkylene glycol (B) is from 0.2 to 15% by mass based on a total amount of the lubricating oil composition;
- the polyalkylene glycol (B) has a number average molecular weight ranging from 10,000 to 60,000;
- and
- the lubricating oil composition does not contain a poly(meth)acrylate.
2 more elements
Dependencies are inferred from the claim text.