Lubricating oil composition and internal combustion engine oil

Details Lubricating oil composition and internal combustion engine oil Lubricating oil composition and internal combustion engine oil

2003-11-11

2009-11-24

Caldarola, Glenn A (Department: 1797)

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Solid hydrocarbon polymer

Reexamination Certificate

active

07622433

ABSTRACT:
The present invention provides a lubricating oil composition having excellent low temperature viscosity properties suitable for engine oils for automobiles and industries, gear oils, shock absorber oils, hydraulic fluids and it also provides a lubricating oil for internal-combustion engines formed from the composition.The lubricating oil composition comprises;a lubricating oil base (A) having a kinematic viscosity at 100° C. of 1 to 50 mm2/s and a viscosity index of not less than 80,an ethylene•propylene copolymer (B) having the following properties (B1) to (B4) such that(B1) the ethylene content is from 30 to 75% by weight,(B2) the intrinsic viscosity [η] is from 1.3 to 2.0 dl/g,(B3) the Mw/Mn is not more than 2.4 and(B4) the melting point as measured with DSC is not higher than 30° C., and optionallya pour point depressant (C).

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