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|1. (WO2013154005) LUBRICANT COMPOSITION|
|Applicants:||MITSUI CHEMICALS, INC.
A lubricant composition which is characterized by containing: (A) an ethylene/α-olefin copolymer that satisfies all of the conditions (A-1)-(A-3) described below; (F) a sulfur-containing compound wherein at least one hydrocarbon group adjacent to a sulfur atom is a secondary or tertiary hydrocarbon group; and, as an optional component, (G) a polymer of an α-olefin having 3-6 carbon atoms. This lubricant composition is also characterized in that: the kinematic viscosity at 40°C is 450-51,000 mm2/s; the sulfur content is 0.1-5 parts by weight; and the content of the component (G) is 0-15 parts by weight. This lubricant composition is especially suitable for gear oil and the like. (A-1) The content of ethylene structure units is 30-70% by mole. (A-2) The kinematic viscosity at 100°C is 20-3,000 mm2/s. (A-3) The Mw/Mn as determined by GPC is 1-2.5.