Patent ID: 6454960
Filing Date: 2002-09-24
Classification: C09K,C10M,C10N,F25B

Abstract:
A refrigerator comprising a compressor unit sealed in a hermetically sealed container, with an hydrofluorocarbon refrigerant or a refrigerant mixture thereof and a refrigerator oil compatible with the refrigerant unit sealed in the hermetically sealed container, wherein the refrigerator oil comprises a polyvinyl ether compound having a structural unit represented by the general formula (1) as the main component, with a pour point of âˆ’40Â° C. or less, a two-liquid separation temperature of âˆ’20Â° C. or less, a total acid number of 0.02 mgKOH/g or less, a viscosity of 8 to 100 cst at 40Â° C. or less, and a viscosity index of 80 or more, wherein n is an integral number in the range of 1 or more, R1, R2 and R3 are each a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms and may be the same or different from each other, R4 is an alkyl group having 2 to 3 carbon atoms, and wherein units in which R4 is an alkyl group having 2 carbon atoms are 80% or more and less than 100% of the polyvinyl ether compound, and wherein the percentage of units in which R4 is an alkyl group having 3 carbon atoms are 20% or less of the polyvinyl ether compound.