Refrigerator oil composition, and refrigerator compressor and refrigeration system using the composition

A refrigerator oil composition, consisting of:

• (a) a base oil which is at least one member selected from the group consisting of naphthenic mineral oils, paraffinic mineral oils, alkylbenzenes, alkylnaphthalenes, poly-α-olefins, polyalkylene glycols, polyoxyalkylene monoethers, polyoxyalkylene diethers, polyvinyl ethers, polyvinyl ether-polyalkylene glycol copolymers, polyol esters and polycarbonates,
• (b) at least one imide compound in an amount of 0.01 to 5% by mass based on the total amount of the refrigerator oil composition, and
• (c) optionally, one or more additives selected from the group consisting of a phosphorus acid ester, an antioxidant, an acid scavenger, an organic sulfur-compound based agent, a thiophosphate-based agent, a higher fatty acid, a hydroxyarylfatty acid, an ester-based agent, an organic chlorine compound-based agent, a fluorinated aliphatic carboxylic acid, a fluorinated ethylene resin, a fluorinated alkylpolysiloxane, a fluorinated graphite, an alcohol-based agent, a metal compound-based agent, a copper deactivator, a load withstanding additive, a chlorine scavenger, a detergent dispersant, a viscosity index improver, an oiliness agent, a rust preventive agent, a corrosion inhibitor, a pour point improver and an antifoaming agent.