Patent ID: 6936576
Filing Date: 2005-08-30
Classification: C10M,C10N

Abstract:
1. A refrigerating machine oil for a carbon dioxide refrigerant, comprising polyalkylene glycol represented by the following general formula (1): wherein a number average molecular weight of said polyalkylene glycol is not less than 500 nor more than 5000, wherein a rate of ethylene group among said alkylene group in said polyalkylene glycol is more than 0 and not more than 80 mol %, and wherein a rate of molecules in which the alkylene group bonded to a terminal hydroxyl group in said polyalkylene glycol is an ethylene group, is not more than 20 mol %, wherein said polyalkylene glycol has a first polymer chain selected from an ethylene oxide homopolymer chain and a copolymer chain of ethylene oxide and one or more alkylene oxides except for ethylene oxide, and a second polymer chain of one or more alkylene oxides except for ethylene oxide, the one end of the first polymer chain being bonded to R