US 12,168,756 B2
Viscosity index improver composition and lubricating oil composition
Nobuhiro Naito, Kyoto (JP); Hiroki Yamashita, Kyoto (JP); Kenyuu Yoshida, Kyoto (JP); and Hiroki Hagihara, Kyoto (JP)
Assigned to SANYO CHEMICAL INDUSTRIES, LTD., Kyoto (JP)
Appl. No. 18/021,222
Filed by SANYO CHEMICAL INDUSTRIES, LTD., Kyoto (JP)
PCT Filed Aug. 20, 2021, PCT No. PCT/JP2021/030641
§ 371(c)(1), (2) Date Feb. 14, 2023,
PCT Pub. No. WO2022/039266, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 2020-139030 (JP), filed on Aug. 20, 2020.
Prior Publication US 2023/0340357 A1, Oct. 26, 2023
Int. Cl. C10M 145/14 (2006.01); C10M 129/06 (2006.01); C10M 169/04 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 30/00 (2006.01); C10N 30/02 (2006.01); C10N 30/18 (2006.01)
CPC C10M 145/14 (2013.01) [C10M 129/06 (2013.01); C10M 169/044 (2013.01); C10M 2207/021 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2030/18 (2013.01); C10N 2030/54 (2020.05)] 6 Claims
 
1. A viscosity index improver composition, comprising:
a (co)polymer (A) comprising a monomer (a) represented by the following formula (1) as an essential monomer;
a C18-C40 chain aliphatic alcohol (B); and
a base oil,

OG Complex Work Unit Chemistry
wherein R1 is a hydrogen atom or a methyl group; —X1— is a group represented by —O— or —NH—; R2 is a C2-C4 alkylene group; R3 and R4 are each independently a C8-C24 linear or branched alkyl group; and p is an integer of 0 to 20, with each R2 being optionally the same as or different from each other when p is 2 or greater.