Patent ID: 7534749

Claim:
A lube base oil other than silicone oil having a kinematic viscosity of 12 mm 2 /s or below at 40° C., exhibiting, in Noack test (250° C., 1 hr), an evaporation loss of 30 mass % or below and/or a flash point of 200° C. or higher, exhibiting an aniline point of 60° C. or higher, and comprising any of the ether compounds represented by the following formula, or a mixture thereof: R 1 —O—(R 2 —O) a —(R 3 —O) b —(R 4 —O) c —R 5 (1) wherein R 1 and R 5 each independently represents hydrogen atom, an alkyl group having 1 to 24 carbon atoms, a phenyl group, or an alkylaryl group having 7 to 24 carbon atoms; R 2 , R 3 , and R 4 each independently represents an alkylene group having 2 to 18 carbon atoms; each of a, b, and c is 0 to 8 as an averaged value; the sum of a to c is 0 to 8; and the units (R 2 —O), (R 3 —O), and (R 4 —O) may be identical to or different from one another.