US 11,655,428 B2
Lubricating oil compositions and lubricating oil viscosity modifiers
Akio Hayakawa, Kawasaki (JP); Akihiro Udagawa, Chiba (JP); Noriko Kai, Otake (JP); and Yuji Tokunaga, Otake (JP)
Assigned to MITSUI CHEMICALS, INC., Tokyo (JP)
Appl. No. 17/44,846
Filed by MITSUI CHEMICALS, INC., Tokyo (JP)
PCT Filed Apr. 16, 2019, PCT No. PCT/JP2019/016255
§ 371(c)(1), (2) Date Oct. 1, 2020,
PCT Pub. No. WO2019/203210, PCT Pub. Date Oct. 24, 2019.
Claims priority of application No. JP2018-079175 (JP), filed on Apr. 17, 2018; and application No. JP2018-079176 (JP), filed on Apr. 17, 2018.
Prior Publication US 2021/0130725 A1, May 6, 2021
Int. Cl. C10M 107/04 (2006.01); C10M 143/02 (2006.01); C10N 40/25 (2006.01); C10N 30/02 (2006.01); C10N 40/26 (2006.01)
CPC C10M 107/04 (2013.01) [C10M 143/02 (2013.01); C10M 2205/022 (2013.01); C10M 2205/0225 (2013.01); C10N 2030/02 (2013.01); C10N 2040/252 (2020.05); C10N 2040/255 (2020.05); C10N 2040/26 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A lubricating oil composition comprising an ethylene/α-olefin copolymer (A) having more than 70 mole % and not more than 90 mole % of structural units derived from ethylene and an intrinsic viscosity [η] of 0.3 to 1.0 dl/g, wherein the copolymer (A) is an ungrafted copolymer of ethylene and 4-methyl-pentene-1 having no less than 10 mole % and no more than 28 mole % of structural units derived from 4-methyl-pentene-1.