ギヤ油用潤滑油組成物

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating oil composition for use in gear oils which maintains a low viscosity, is still low in the viscosity even at a cryogenic circumstance and also is excellent in the shear stability and oxidation stability. <P>SOLUTION: This lubricating oil composition for use in gear oils includes: a lubricating oil base oil (A) having a viscosity index of 110 or more and a dynamic viscosity at 100&deg;C of 2-7 mm<SP>2</SP>/s; and 5-40 mass% of a 8-20C &alpha;-olefin (co)polymer (B) having a dynamic viscosity at 100&deg;C of 550-2,000 mm<SP>2</SP>/s, a number-average molecular weight (Mn) of 6,000-30,000, a molecular weight distribution (Mw/Mn) of 1.1-1.8, a content of an unsaturated group of 10% or less and a viscosity index within a specified range. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

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