	US 12,286,601 B2
	Lubricating oil composition, buffer and method for using lubricating oil composition
Kenji Kobayashi, Tokyo (JP)
Assigned to IDEMITSU KOSAN CO., LTD., Chiyoda-ku (JP)
Appl. No. 18/004,279
Filed by IDEMITSU KOSAN CO.,LTD., Chiyoda-ku (JP)
PCT Filed Jul. 2, 2021, PCT No. PCT/JP2021/025094 § 371(c)(1), (2) Date Jan. 4, 2023, PCT Pub. No. WO2022/009791, PCT Pub. Date Jan. 13, 2022.
Claims priority of application No. 2020-116267 (JP), filed on Jul. 6, 2020.
Prior Publication US 2024/0141249 A1, May 2, 2024
Int. Cl. C10M 101/02 (2006.01); C10M 133/56 (2006.01); C10M 137/10 (2006.01); C10M 169/04 (2006.01); C10N 10/04 (2006.01); C10N 30/06 (2006.01)

CPC C10M 137/105 (2013.01) [C10M 101/02 (2013.01); C10M 133/56 (2013.01); C10M 169/04 (2013.01); C10M 2215/086 (2013.01); C10M 2223/045 (2013.01); C10M 2223/047 (2013.01); C10N 2010/04 (2013.01); C10N 2030/06 (2013.01)]

20 Claims

1. A lubricating oil composition suitable for lubrication of a shock absorber in contact with a rubber component, the composition comprising:

a base oil (A) comprising a mineral oil classified in Group III of API;

a zinc dithiophosphate (B) comprising a zinc dialkyldithiophosphate; and

an alkenylsuccinic imide (C),

wherein the zinc dithiophosphate (B), in terms of zinc atoms, is present in a range of from 0.035 to 0.14 mass %, based on total lubricating oil composition mass,

wherein the alkenylsuccinic imide (C), in terms of nitrogen atoms, is present in a range of from 0.005 to 0.12 mass %, based on the total lubricating oil composition mass, and

wherein the lubricating oil composition has a kinematic viscosity at 40° C. in a range of from 5.0 to 50 mm²/s.