MIXED ESTER OF MIXED POLYHYDRIC ALCOHOL AND CARBOXYLIC ACID

摘要

The present invention provides a mixed ester of a mixed polyhydric alcohol comprising pentaerythritol and dipentaerythritol which is represented by formula (I), and a carboxylic acid that contains isobutyric acid. The molar ratio of the pentaerythritol and the dipentaerythritol (pentaerythritol/dipentaerythritol) in the mixed polyhydric alcohol is between 98/2 and 40/60, and the proportion of isobutyric acid in the carboxylic acid is 35 to 85 mol.%. The mixed ester, while maintaining a viscosity range required for a refrigerator oil, exhibits excellent lubricating properties and excellent compatibility with a difluoromethane refrigerant, and can be used as a refrigerator oil and the like.