US 12,270,007 B2
Refrigerator oil, and working fluid composition for refrigerator
Fumiyuki Nara, Tokyo (JP); Yohei Shono, Tokyo (JP); and Hidetoshi Ogata, Tokyo (JP)
Assigned to ENEOS CORPORATION, Tokyo (JP)
Appl. No. 18/266,945
Filed by ENEOS Corporation, Tokyo (JP)
PCT Filed Dec. 20, 2021, PCT No. PCT/JP2021/047049
§ 371(c)(1), (2) Date Jun. 13, 2023,
PCT Pub. No. WO2022/138569, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-214695 (JP), filed on Dec. 24, 2020.
Prior Publication US 2023/0365887 A1, Nov. 16, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10M 171/00 (2006.01); C09K 5/04 (2006.01); C10M 101/02 (2006.01); C10M 171/02 (2006.01); C10N 20/02 (2006.01); C10N 40/30 (2006.01)
CPC C10M 171/008 (2013.01) [C09K 5/042 (2013.01); C10M 101/02 (2013.01); C10M 171/02 (2013.01); C09K 2205/12 (2013.01); C10M 2203/1025 (2013.01); C10N 2020/02 (2013.01); C10N 2040/30 (2013.01)] 10 Claims
 
1. A refrigerating machine oil, comprising:
a low-viscosity hydrocarbon oil having a kinematic viscosity at 40° C. of 6 mm2/s or lower; and
a high-viscosity hydrocarbon oil having a kinematic viscosity at 40° C. of higher than 400 mm2/s;
wherein the high-viscosity hydrocarbon oil is a residual oil hydrocarbon base material selected from the group consisting of
an atmospheric distillation residual oil of a crude oil,
a vacuum distillation residual oil of the atmospheric distillation residual oil,
a deasphalted oil of the atmospheric distillation residual oil or the vacuum distillation residual oil,
a solvent extracted extract oil of the deasphalted oil,
a solvent extracted raffinate oil of the deasphalted oil, and
a refined oil of the atmospheric distillation residual oil, the vacuum distillation residual oil, the deasphalted oil, the solvent extracted extract oil or the solvent extracted raffinate oil,
wherein the refrigerating machine oil has a flash point of 130° C. or lower and a carbon residue of 10% residual oil of 0.02% by mass or more, wherein the carbon residue of 10% residual oil is measured by the Micro method in accordance with JIS K2270-2:2009 for residual oil obtained by distilling the refrigerating machine oil and removing distillate oil having a volume fraction of up to 90%, and wherein the refrigerating machine oil is used with a refrigerant.