Lube base oil and lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsYukio Yoshida, Toshiyuki Tsubouchi, Hiroki Sekiguchi, Hidetoshi Koga
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Abstract
A lube base oil which comprises at least one hydrocarbon compound having as the basic skeleton a structure represented by any of the general formulae (I) to (VI) and has a viscosity at −40° C. of 40 Pa·s or lower and a viscosity index of 80 or higher, (wherein p is an integer of 1 to 10, provided that in the formulae (I) and (II), p is not 1). It satisfies the coefficient of high-temperature traction, low-temperature flowability, and viscosity index on a high level.
Claims18
A composition comprising 1-60% by mass of at least one hydrocarbon compound of any of formulas (a) to (f),
- wherein in (a)-(t), k, m and n are each an integer of 0 to 6 with the proviso that k+m is an integer of 0 to 6, and wherein R1 and R2 each represent an alkyl group having 1 to 4 carbon atoms or a cycloalkyl group having 5 to 12 carbon atoms;
- and a synthetic traction base oil which is selected from the group consisting of:
- a hydrocarbon which has 16 to 20 carbon atoms and which is represented by the formula (h):
- wherein q is an integer of 1 or 2 and r is an integer of 2 or 3,
- 2,4-dicyclohexyl-2-methylpentane, and
- 2,3-dicyclohexyl-2,3-dimethylbutane,
- wherein the composition has a viscosity, at −40° C., of 40 Pa·s or lower, and a viscosity index of 80 or higher.
Dependencies are inferred from the claim text.