LUBRICATING OIL FOR REFRIGERATOR.

摘要

A lubricating oil for a refrigerator using a chlorofluorocarbon substitute as the refrigerant, which contains a polymer of a fumaric ester or a copolymer of a fumaric ester with a copolymerizable alkylene and, if desired, an organic carboxylic ester or a polyalkylene glycol with a kinematic viscosity of 2 to 30 cSt. The oil is compatible with a refrigerant comprising a chloroflurocarbon substitute such as a hydrochlorofluorocarbon, in particular, R134a in a wide temperature range, has a high viscosity index, is thermally and chemically stable, and has an excellent lubricity.