| abstract |
The present invention is a refrigeration oil composition comprising a base oil and a polyalkylene glycol (PAG) block copolymer, characterized in that the PAG block copolymer is represented by the following formula (1). <Formula 1> (Wherein R 1 represents a hydrocarbon moiety having 1 to 10 carbon atoms, R 2 represents an alkylene group having 3 to 6 carbon atoms, E represents an ethylene group, R 3 represents hydrogen or an alkyl group having 1 to 10 carbon atoms, m and n represent positive integers, the ratio is m / n = 99/1 to 50/50, and l represents an integer from 1 to 100.) |