ENGINE OIL COMPOSITION

PROBLEM TO BE SOLVED: To provide an engine oil composition excellent in fuel consumption saving performance, especially engine oil composition used preferably for a diesel engine.SOLUTION: An engine oil composition contains (A) a star type polymer having a star type structure with a branched polymer...

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Bibliographische Detailangaben
1. Verfasser:	AKAMATSU ATSUSHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY FUELS INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS LUBRICANTS LUBRICATING COMPOSITIONS METALLURGY PEAT PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MONOXIDE USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an engine oil composition excellent in fuel consumption saving performance, especially engine oil composition used preferably for a diesel engine.SOLUTION: An engine oil composition contains (A) a star type polymer having a star type structure with a branched polymer chain obtained by copolymerization and hydrogenation of a vinyl aromatic compound monomer and a conjugated diene monomer from a central part of the polymer, and having a weight average molecular weight of 100,000 to 1,000,000 and (B) polyalkyl(meth)acrylate having a weight average molecular weight of 200,000 to 600,000 as a viscosity index improver, and the content of the (A) star type polymer (M) is 0.10 to 2.00 mass% based on total mass of the engine oil composition, the content of the (B) polyalkyl(meth)acrylate (M) is 0.50 to 6.00 mass% based on total mass of the engine oil composition, and M/Mis 0.10 to 1.00, and a viscosity index of the engine oil composition is 185 to 230.