US 12,252,567 B2
Acrylate-based copolymer, method for producing said copolymer, friction reducer using said copolymer, and lubricating composition containing said friction reducer
Kenji Yamamoto, Tokyo (JP); Tsuyoshi Hiramatsu, Tokyo (JP); Shuhei Igarashi, Tokyo (JP); and Kazuki Marumo, Tokyo (JP)
Assigned to ADEKA CORPORATION, Tokyo (JP)
Appl. No. 17/616,407
Filed by ADEKA CORPORATION, Tokyo (JP)
PCT Filed Jun. 2, 2020, PCT No. PCT/JP2020/021686
§ 371(c)(1), (2) Date Dec. 3, 2021,
PCT Pub. No. WO2020/246445, PCT Pub. Date Dec. 10, 2020.
Claims priority of application No. 2019-104091 (JP), filed on Jun. 4, 2019.
Prior Publication US 2022/0251266 A1, Aug. 11, 2022
Int. Cl. C08K 5/01 (2006.01); C08F 220/18 (2006.01)
CPC C08F 220/1812 (2020.02) [C08K 5/01 (2013.01)] 9 Claims
 
1. A lubricating oil composition, comprising:
a friction reducer consisting of an acrylate-based copolymer; and
a base oil wherein the acrylate-based copolymer is obtained by polymerizing monomers containing a polymerizable monomer (a) consisting of an alkyl acrylate-based monomer represented by the following general formula (1) in an amount of from 10 mol % to 95 mol % with respect to a total number of moles of the constituent monomers, a polymerizable monomer (b) consisting of an alkylene glycol acrylate-based monomer represented by the following general formula (2) in an amount of from 5 mol % to 50 mol % with respect to the total number of moles of the constituent monomers, and at least one kind of polymerizable monomer (c) selected from the group consisting of an aromatic vinyl-based monomer (c-1) and a short-chain alkyl acrylate-based monomer (c-2) represented by the following general formula (3) in an amount of from 0 mol % to 60 mol % with respect to the total number of moles of the constituent monomers:

OG Complex Work Unit Chemistry
wherein R1 represents an alkyl group having 4 to 18 carbon atoms, and A1 represents a hydrogen atom;

OG Complex Work Unit Chemistry
wherein R2 represents an alkylene group having 2 to 4 carbon atoms, R3 represents a hydrogen atom or an alkyl group having 1 to 30 carbon atoms, A2 represents a hydrogen atom, and “n” represents a number from 2 to 20; and

OG Complex Work Unit Chemistry
wherein R4 represents an alkyl group having 1 to 3 carbon atoms, and A3 represents a hydrogen atom.