Patent ID: 8070978

Claim:
A refrigerating machine oil composition comprising a base oil comprising a hydrogenated Î±-olefin oligomer as a main component and at least one additive selected from the group consisting of an extreme pressure agent, an oiliness agent, an antioxidant, an acid scavenger and a defoaming agent; wherein the hydrogenated Î±-olefin oligomer is obtained by hydrogenating an oligomer of an Î±-olefin having 5 to 20 carbon atoms which is obtained by oligomerization of an Î±-olefin having 5 to 20 carbon atoms in the presence of a metallocene catalyst, a ratio of a weight-average molecular weight to a number-average molecular weight of the hydrogenated Î±-olefin oligomer is 1.5 or less, and the hydrogenated Î±-olefin oligomer has a kinematic viscosity of 2.78 to 4.96 mm 2 /s as measured at 40Â° C. and has a flash point of 132 to 178Â° C.