Lubricating oil composition
AssigneeShell USA, Inc.
InventorsKengo Suzuki, Kunitoshi Abe
Life of this patent
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Abstract
The present invention provides a lubricating oil composition comprising: (A) a lubricant base oil including at least one type selected from mineral oil, PAO, and GTL (gas-to-liquid) base oils; (B) a compound having a structure obtained by independently subjecting propylene oxide to addition polymerization with an alcohol or a structure obtained by subjecting a combination of propylene oxide with ethylene oxide and/or butylene oxide to addition polymerization with an alcohol, and being configured so that polyalkylene glycol (PAG) with an oxygen/carbon weight ratio of 0.35 or more and less than 0.45 and/or one or both terminal hydroxyl groups in the polyalkylene glycol (PAG) are blocked; and (C) a fatty acid ester having an oxygen/carbon weight ratio of 0.05 to 0.35.
Claims4
A lubricating oil composition comprising:
- (A) a lubricant base oil including at least one type selected from mineral oil, PAO, and GTL (gas-to-liquid) base oils;
- (B) a high viscosity component in an amount of from 7 to 30% by weight relative to the overall weight of the lubricating oil composition, wherein the high viscosity component has a kinematic viscosity at 100° C. of from 40 to 1000 mm2/s and is a polyalkylene glycol (PAG) having a structure obtained by independently subjecting propylene oxide to addition polymerization with an alcohol or a structure obtained by subjecting a combination of propylene oxide with ethylene oxide and/or butylene oxide to addition polymerization with an alcohol, and wherein the PAG has an oxygen/carbon weight ratio of 0.35 or more and less than 0.45, and
- (C) a fatty acid ester having an oxygen/carbon weight ratio of 0.05 to 0.35.
Dependencies are inferred from the claim text.