Patent ID: 8486871

Claim:
A method of lubricating a compression-type refrigerator with a lubricating oil, wherein said compression-type refrigerator comprises a hydrofluorocarbon refrigerant and said lubricating oil comprises a polyvinyl ether-based compound having a structure represented by the general formula (I) wherein R 1 , R 2 and R 3 each represent a hydrogen atom or a C 1 to C 8 hydrocarbon group and may be the same as or different from each other; R b represents a divalent C 2 to C 4 hydrocarbon group; R a represents a hydrogen atom, a C 1 to C 20 aliphatic or alicyclic hydrocarbon group, a C 1 to C 20 aromatic group which may have a substituent, a C 2 to C 20 acyl group or a C 2 to C 50 oxygen-containing hydrocarbon group; R 4 represents a C 1 to C 10 hydrocarbon group; with the proviso that when there are a plurality of R a 's, a plurality of R b 's and a plurality of R 4 's, the R a 's, R b 's and R 4 's may each be the same as or different from each other; m is a number of 1 to 50 on average; k is a number of 1 to 50 on average; and p is a number of 2 to 50 on average; with the provisos that when there are a plurality of k's and a plurality of p's, the distribution may each be block or random, and that when there are a plurality of R b O's, the R b O's may be the same as or different from each other.