US 12,275,910 B2
Lubricating oil composition
Akio Kojima, Ichihara (JP); Yukio Yoshida, Ichihara (JP); Kenichi Ogata, Ichihara (JP); Shota Kato, Chiba (JP); and Keiichi Narita, Chiba (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
Appl. No. 18/005,692
Filed by IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
PCT Filed Aug. 23, 2021, PCT No. PCT/JP2021/030748
§ 371(c)(1), (2) Date Jan. 17, 2023,
PCT Pub. No. WO2022/045050, PCT Pub. Date Mar. 3, 2022.
Claims priority of application No. 2020-141945 (JP), filed on Aug. 25, 2020.
Prior Publication US 2023/0272297 A1, Aug. 31, 2023
Int. Cl. C10M 107/32 (2006.01); C10M 107/24 (2006.01); C10N 30/02 (2006.01); C10N 40/04 (2006.01); C10N 40/16 (2006.01)
CPC C10M 107/32 (2013.01) [C10M 107/24 (2013.01); C10M 2209/043 (2013.01); C10M 2209/1055 (2013.01); C10N 2030/02 (2013.01); C10N 2040/04 (2013.01); C10N 2040/16 (2013.01)] 20 Claims
 
1. A method of cooling an electric vehicle device, the method comprising:
contacting a lubricating oil composition with the electric vehicle device, thereby cooling the electric vehicle device,
wherein the lubricating oil composition comprises a base oil (A), the base oil (A) comprising up to 70% by mass mineral oil and in a range of from 30 to 100% by mass:
(A1) a polyalkylene glycol having a structural unit of formula (1):

OG Complex Work Unit Chemistry
R1 and R2 each being independently H or a monovalent hydrocarbon group having 1 to 18 carbon atoms, R3 being a methyl group, and n being an integer in a range of from 3 to 5; and/or
(A2) a polyvinyl ether having a structural unit of formula (2)

OG Complex Work Unit Chemistry
R8 being a divalent hydrocarbon group having 2 to 10 carbon atoms, R9 being a methyl group, m being 3 or 4, and q being 0.