US 12,221,590 B2
Refrigerator oil, and working fluid composition for refrigerator
Tatsuki Nakajima, Tokyo (JP); Shogo Hashimoto, Tokyo (JP); Hidetoshi Ogata, Tokyo (JP); and Yuma Seki, Tokyo (JP)
Assigned to ENEOS CORPORATION, Tokyo (JP)
Appl. No. 18/013,418
Filed by ENEOS CORPORATION, Tokyo (JP)
PCT Filed Jul. 7, 2021, PCT No. PCT/JP2021/025666
§ 371(c)(1), (2) Date Dec. 28, 2022,
PCT Pub. No. WO2022/009931, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 2020-117803 (JP), filed on Jul. 8, 2020.
Prior Publication US 2023/0250354 A1, Aug. 10, 2023
Int. Cl. C10M 129/76 (2006.01); C09K 5/04 (2006.01); C10M 169/04 (2006.01); C10N 40/30 (2006.01)
CPC C10M 129/76 (2013.01) [C09K 5/045 (2013.01); C10M 169/04 (2013.01); C09K 2205/126 (2013.01); C10M 2207/281 (2013.01); C10M 2207/289 (2013.01); C10N 2040/30 (2013.01)] 14 Claims
 
1. A working fluid composition for a refrigerating machine, comprising:
a refrigerating machine oil; and
a refrigerant comprising an unsaturated hydrofluorocarbon,
wherein the refrigerating machine oil comprises:
a base oil comprising a mixture of polyol esters of a saturated carboxylic acid having 4 to 10 carbon atoms and a polyhydric alcohol selected from pentaerythritol, dipentaerythritol, and a mixture thereof; and
a partial ester of a carboxylic acid and pentaerythritol;
wherein
the carboxylic acid comprises an unsaturated carboxylic acid having 14 to 18 carbon atoms,
the partial ester comprises a monoester of pentaerythritol, a diester of pentaerythritol, and a triester of pentaerythritol,
the partial ester has a hydroxyl value of 20 mgKOH/g or more, and
a content of the base oil is 90% by mass or more, and a content of the partial ester is 0.1 to 5% by mass, based on a total amount of the refrigerating machine oil.