Idemitsu Kosan Company, Limited

Akira Nakamura

Tadashi Katafuchi

Makoto Ikeda

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.

Lubricant for refrigerating machine employing refrigerant comprising

There has been disclosed herein a lubricant for refrigerating machines employing tetrafluoroethane or the like as a refrigerant which comprises as an essential component a base oil 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 a polyoxyalkylene glycol compound, etc. The lubricant is used along with a refrigerant comprising a substituted flon compound such as 1,1,1,2-tetrafluoroethane (R-134a), and is excellent in the performance such as wear resistance, electrical insulating properties, hydrolytic stability, nonhygroscopicity, etc. and also in returnability of the lubricant. Thus, the lubricant is especially effective when used in automobile or household air conditioners, refrigerators, etc. having high industrial usefulness.

Lubricant refrigerant comprising composition containing fluorohydrocarbon

A grease composition comprising: (a) from 1 to 4 parts by weight of a zinc dithiophosphate; (b) from 2 to 6 parts by weight of a phosphoric acid ester; and (c) from 0.5 to 2 parts by weight of an organotin compound admixed in 100 parts by weight of a base grease. This grease has excellent lubricating characteristics and is even suitable for use in delicate bearings such as needle bearings.

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Ichihara, Japan

Akira Nakamura