US 12,258,532 B2
Refrigerator oil, and working fluid composition for refrigerator
Hidetoshi Ogata, Tokyo (JP); Fumiyuki Nara, Tokyo (JP); and Yohei Shono, Tokyo (JP)
Assigned to ENEOS CORPORATION, Tokyo (JP)
Appl. No. 17/920,121
Filed by ENEOS CORPORATION, Tokyo (JP)
PCT Filed Apr. 27, 2021, PCT No. PCT/JP2021/016813
§ 371(c)(1), (2) Date Oct. 20, 2022,
PCT Pub. No. WO2021/221058, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-080362 (JP), filed on Apr. 30, 2020.
Prior Publication US 2023/0167377 A1, Jun. 1, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10M 145/14 (2006.01); C09K 5/04 (2006.01); C10M 101/02 (2006.01); C10M 169/04 (2006.01); C10N 20/02 (2006.01); C10N 30/02 (2006.01); C10N 40/30 (2006.01)
CPC C10M 145/14 (2013.01) [C09K 5/042 (2013.01); C10M 101/02 (2013.01); C10M 169/041 (2013.01); C09K 2205/12 (2013.01); C10M 2203/003 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2030/02 (2013.01); C10N 2040/30 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A refrigerating machine oil comprising:
a lubricating base oil; and
a polymer comprising an unsaturated carboxylic acid ester as a monomer unit and having a weight average molecular weight of 50,000 or less,
wherein the unsaturated carboxylic acid ester consists of:
an ester (Eg) of an unsaturated carboxylic acid and an alcohol having a hydrocarbon group represented by the following formula (1):

OG Complex Work Unit Chemistry
wherein x represents an integer of 9 to 13, and y represents an integer of 7 to 11, and wherein the alcohol comprises at least one selected from the group consisting of 2-octyldodecanol, 2-decyltetradecanol and 2-dodecylhexadecanol; and
an ester (Es-1) of an unsaturated carboxylic acid and an alcohol having a linear alkyl group having 1 to 4 carbon atoms,
an ester (Es-2) of an unsaturated carboxylic acid and an alcohol having a linear alkyl group having 5 to 19 carbon atoms, and
optionally an ester (Eb) of an unsaturated carboxylic acid and an alcohol having a branched alkyl group having 3 to 18 carbon atoms,
wherein a total proportion of the ester (Eg), the ester (Es-1) and the ester (Es-2) is 90% by mole or more based on the total monomer units constituting the polymer, and
wherein a proportion of the ester (Eg) is 5 to 20% by mole, a proportion of the ester (Es-1) is 60 to 75% by mole, and a proportion of the ester (Es-2) is 10 to 25% by mole, with respect to 100% by mole of the total of the ester (Eg), the ester (Es-1) and the ester (Es-2), and wherein the refrigerating machine oil is used together with a refrigerant.