Patent ID: 8603354

Claim:
A method of lubricating a refrigerator, wherein the refrigerator includes a refrigerant comprising at least one fluorine-containing organic compounds selected from compounds represented by the following molecular formula (A) or including a combination of the fluorine-containing organic compound and a saturated fluorinated hydrocarbon compound, C p O g F r R s (A) wherein R represents Cl, Br, I, or H; p represents an integer of 1 to 6, q represents an integer of 0 to 2, r represents an integer of 1 to 14, and s represents an integer of 0 to 13; and provided that, when q represents 0, p represents 2 to 6 and one or more carbon-carbon unsaturated bonds are included in the molecule, comprising providing in the refrigerator a lubricating composition comprising a base oil including as a main component at least one member selected from the group consisting of copolymers of poly(oxy)alkylene glycols or monoethers thereof and polyvinyl ethers represented by formula (VIII): wherein: R 29 , R 30 , and R 31 each represent a hydrogen atom, R 33 represents a divalent hydrocarbon group having 2 to 4 carbon atoms, R 34 represents an alkyl group having 1 to 10 carbon atoms, R 32 represents a hydrocarbon group having 1 to 10 carbon atoms, and when multiple R 34 's, R 33 's, and R 32 's are present, multiple R 34 's, R 33 's, and R 32 's may be identical to or different from one another, u is in the range of 2 to 25, k is in the range of 1 to 50, v is in the range of 1 to 4, and wherein the copolymers of poly(oxy)alkylene glycols or monoethers thereof and polyvinyl ethers represented by formula (VIII) have terminals represented by formula (XV), (XVI), (XVII) or (XVIII): wherein R 29 , R 30 , R 31 , R 32 , R 33 and R 34 are as defined above.