| 摘要 |
A lubricant composition for compression-type refrigerating machines containing tetrafluoroethane or the like as a refrigerant and a lubricant comprising (A) 40 to 95% by weight of a synthetic oil composed of a poly- alpha -olefin and/or an ethylene/ alpha -olefin copolymer or a mixture of an alkylbenzene and a poly- alpha -olefin and/or an ethylene/ alpha -olefin copolymer and (B) 5 to 60% by weight of a fluidity improver composed of both or either of an ester compound and a triglyceride. The lubricant composition is excellent in the performance such as wear resistance, electrical insulating properties, hydrolytic stability, nonhygroscopicity, etc. and also in returnability of the lubricant composition. Thus, the lubricant is especially effective when used in automobile or household air conditioner, refrigerator, etc. having high industrial usefulness.
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