| 摘要 |
PCT No. PCT/JP94/00747 Sec. 371 Date Dec. 15, 1994 Sec. 102(e) Date Dec. 15, 1994 PCT Filed May 9, 1994 PCT Pub. No. WO94/28092 PCT Pub. Date Dec. 8, 1994A first refrigerating machine oil of the present invention has a sodium and/or potassium concentration of not higher than 0.1 ppm. Since it has low hydrolyzability and excellent insulating properties, the first refrigerating machine oil is useful as a refrigerating machine oil composition for refrigerators having a hermetic compressor. A second refrigerating machine oil of the present invention is composed mainly of an ester of pentaerythritol and a carboxylic acid. The carboxylic acid is a mixed carboxylic acid composed of 3,5,5-trimethylhexanoic acid and a straight-chain or branched fatty acid having from 6 to 8 carbon atoms. The proportion of 3,5,5-trimethylhexanoic acid in the mixed carboxylic acid is in the range of from more than 50 mol % to not more than 90 mol %. The second refrigerating machine oil has high viscosity and high electrical insulating properties, which are required for refrigerating machine oils as used for large-sized air conditioning equipment and room air conditioners, and is non-crystallizable at low temperature and hence superior in handleability.
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