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US 12,545,850 B2Granted
Lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsDaisuke Nakaue, Masaya Kubota
Life of this patent
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Abstract
A lubricating oil composition may have excellent fuel economy and high shear stability. Such a lubricating oil composition may include: a comb-like polymer (A1) having a weight average molecular weight (Mw) of less than 300,000; and a comb-like polymer (A2) having a Mw of at least 400,000. The (A1)/(A2) mass content ratio of the comb-like polymer (A1) to the comb-like polymer (A2) in terms of resin content may be at least 0.25.
Claims14
A lubricating oil composition, comprising:
- a base oil;
- a comb polymer (A1) having a weight-average molecular weight, Mw, of less than 300,000 and a ratio of weight-average molecular weight to number average molecular weight, Mw/Mn, of 4.00 or less;
- and
- a comb polymer (A2) having a Mw of 400,000 or more and a Mw/Mn of 6.00 or less,
- wherein a mass content ratio A1/A2 in terms of resin content mass between the comb polymer (A1) and the comb polymer (A2) is in a range of 0.25 to 0.55.
2 more elements
Dependencies are inferred from the claim text.