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US 6,306,801 B1Granted
Lubricating oil composition comprising acylated bissuccinimide, zinc dithiophosphate and metallic detergent
AssigneeNippon Mitsubishi Oil Corporation
InventorsKazuhiro Yagishita, Yoko Matsuyama, Osamu Kurosawa
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Abstract
A lubricating oil composition having an excellent sludge formation inhibiting effect and being suitable for use as an engine oil is provided. The lubricating oil composition includes: a lubricating base oil, (A) 0.5 to 20% by mass of acylated bissuccinimide, (B) 0.05 to 0.3% by mass of zinc dithiophosphate in terms of the phosphorus content, and (C) 0.5 to 4.0% by mass of metallic detergent in terms of the sulfated ash content, based on the total mass of the composition.
Claims19
A lubricating oil composition comprising:
- a lubricating base oil;
- (A) 0.5 to 20% by mass of acylated bissuccinimide represented by the following general formula (1):
- where R1 and R2 are each independently a straight or branched alkyl group or alkenyl group having 40 to 400 carbon atoms;
- R3 is an alkoxy group having 1 to 24 carbon atoms or a hydroxy(poly)oxyalkylene group represented by —O—(R4O)cH where R4 is an alkylene group having 1 to 4 carbon atoms, and c is an integer of 1 to 5;
- and a is an integer of 1 to 4, b is an integer of 0 to 3, and a+b=1 to 4;
- (B) 0.05 to 0.3% by mass of zinc dithiophosphate in terms of the phosphorous content;
- and
- (C) 0.5 to 4.0% by mass of a metallic detergent in terms of the sulfated ash content, based on the total mass of the composition.
5 more elements
Dependencies are inferred from the claim text.