Nissan Motor Company Limited

Japan Energy Corporation

Sumio Yokoo

Takashi Kaimai

Hiroki Tawaki

Yoshie Arakawa

A working fluid composition for a compression type refrigerator, comprising: (A) a refrigerant composed of ammonia or at least one hydrofluorocarbon having the number of carbon being not more than 2 and containing no chlorine; and (B) a lubricant for the refrigerator, said lubricant comprising 100 parts by weight of a synthetic oil and 0.5 to 10.0 parts by weight of at least one benzotriazole derivative expressed by the following formula (I). ##STR1## in which R.sup.1 is hydrogen or an alkyl group having the number of carbons being 1-10, and R.sup.2 and R.sup.3 independently indicate an alkyl group having the number of carbons being 4-18.

Working fluid composition for HFC refrigerant compressor containing

A lubricating oil for flon compressor includes, as a main ingredient, a compound represented by a formula (I):

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Yokohama, Japan

Sumio Yokoo