US 12,227,712 B2
Refrigerating machine oil, working fluid composition for refrigerating machine, lubricating method, and method for producing refrigerating machine oil
Yohei Shono, Tokyo (JP); and Fumiyuki Nara, Tokyo (JP)
Assigned to ENEOS CORPORATION, Tokyo (JP)
Appl. No. 17/776,400
Filed by ENEOS CORPORATION, Tokyo (JP)
PCT Filed Nov. 13, 2020, PCT No. PCT/JP2020/042508
§ 371(c)(1), (2) Date May 12, 2022,
PCT Pub. No. WO2021/100634, PCT Pub. Date May 27, 2021.
Claims priority of application No. 2019-208869 (JP), filed on Nov. 19, 2019.
Prior Publication US 2022/0411710 A1, Dec. 29, 2022
Int. Cl. C10M 101/00 (2006.01); C10M 129/56 (2006.01)
CPC C10M 101/00 (2013.01) [C10M 129/56 (2013.01); C10M 2209/086 (2013.01)] 7 Claims
 
1. A refrigerating machine oil comprising:
a lubricating base oil comprising a mineral oil; and
a polymer additive, and
the refrigerating machine oil being used with a refrigerant, wherein:
a carbon residue of 10% residual oil of the refrigerating machine oil is 0.05% by mass or more, as measured in accordance with micro method in accordance with JIS K2270-2:2009;
the polymer additive is a copolymer of only a maleic acid ester and an α-olefin, and has a ratio of a carbon residue (% by mass) to a kinematic viscosity at 100° C. (mm2/s) of 0.011 to 0.02;
the maleic acid ester is an ester of maleic acid with an aliphatic alcohol having 3 to 8 carbon atoms; and
a content of the polymer additive is 0.8% by mass or more and 3% by mass or less based on the total amount of the refrigerating machine oil.