Patent ID: 7794619

Claim:
A refrigeration lubricant composition, comprising: a polyol-fatty acid ester compound which is a reaction product obtained from a polyol and a fatty acid; and a five- or six-membered ring cyclic acetal compound represented by any of the following structural formulas (I) to (IV): where R 1 and R 2 in the formulas each represent hydrogen, R 3 represents an alkyl group having 1 or 2 carbon atoms, and A 1 and A 2 each represent an ester group represented by the formula (V) where A 1 and A 2 are the same or different, and where R 4 represents an alkyl group having a straight or branched chain having 4 to 11 carbon atoms, wherein the content of the cyclic acetal compound is 0.01 to 5 parts by mass based on 100 parts by mass of the polyol-fatty acid ester compound, and wherein the refrigeration lubricant composition is adapted to use with a drive apparatus having rare earth magnets and a refrigerant compressor which is driven by the drive apparatus to compress a refrigerant.