	US 12,460,149 B2
	Lubricating oil composition
Takayuki Uekusa, Ichihara (JP); Kiyohide Inomata, Ichihara (JP); Akihiro Udagawa, Chiba (JP); and Shuhei Yamamoto, Ichihara (JP)
Assigned to Mitsui Chemicals, Inc., Tokyo (JP)
Appl. No. 18/694,039
Filed by MITSUI CHEMICALS, INC., Tokyo (JP)
PCT Filed Sep. 28, 2022, PCT No. PCT/JP2022/036093 § 371(c)(1), (2) Date Mar. 21, 2024, PCT Pub. No. WO2023/054440, PCT Pub. Date Apr. 6, 2023.
Claims priority of application No. 2021-161607 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0384197 A1, Nov. 21, 2024
Int. Cl. C10M 143/08 (2006.01); C10M 101/02 (2006.01); C10M 169/04 (2006.01); C10N 20/02 (2006.01); C10N 30/02 (2006.01)

CPC C10M 143/08 (2013.01) [C10M 101/02 (2013.01); C10M 169/041 (2013.01); C10M 2203/1006 (2013.01); C10M 2205/028 (2013.01); C10N 2020/02 (2013.01); C10N 2030/02 (2013.01)]

6 Claims

1. A lubricating oil composition comprising a copolymer (A) and a base oil (B), wherein the copolymer (A) satisfies the following requirements (a-1) and (a-2), and a content ratio between the copolymer (A) and the base oil (B) is such that the copolymer (A) is in a range of 0.1 to 50 parts by mass per 100 parts by mass in total of the copolymer (A) and the base oil (B):

(a-1) the copolymer (A) is a copolymer of 4-methyl-1-pentene and propylene comprising a constituent unit derived from 4-methyl-1-pentene within a range of 1 mol % or more and 24 mol % or less relative to the total constituent units; and

(a-2) an intrinsic viscosity [η] measured in decalin at 135° C. is in a range of 1.3 to 2.0 dl/g.