abstract |
It is a mixed ester of pentaerythritol and carboxylic acid, and the carboxylic acid contains butyric acid, 3,5,5-trimethylhexanoic acid, and an aliphatic carboxylic acid having 5 to 7 carbon atoms, and is excellent for difluoromethane refrigerant Provided is a tetraester of pentaerythritol used for refrigerating machine oil having compatibility and the like. |