US 12,454,657 B2
Viscosity index improver for lubricants based on polyisobutylenephenyl acrylate comb copolymers
Ivette Garcia Castro, Ludwigshafen am Rhein (DE); Rene Koschabek, Ludwigshafen am Rhein (DE); Andrea Misske, Ludwigshafen am Rhein (DE); and Christoph Fleckenstein, Ludwigshafen am Rhein (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 18/715,771
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Nov. 29, 2022, PCT No. PCT/EP2022/083600
§ 371(c)(1), (2) Date Jun. 3, 2024,
PCT Pub. No. WO2023/104584, PCT Pub. Date Jun. 15, 2023.
Claims priority of application No. 21212540 (EP), filed on Dec. 6, 2021.
Prior Publication US 2025/0109351 A1, Apr. 3, 2025
Int. Cl. C10M 145/14 (2006.01); C08F 220/18 (2006.01); C10N 30/02 (2006.01)
CPC C10M 145/14 (2013.01) [C08F 220/18 (2013.01); C10M 2209/084 (2013.01); C10N 2030/02 (2013.01)] 15 Claims
 
1. A comb copolymer comprising in polymerized form
(A) a PIB macromonomer of the formula (I)

OG Complex Work Unit Chemistry
where
R1 to R5 are selected independently from each other from the group comprising hydrogen, C1-C20-alkyl, C1-C20-alkyloxy, C8-C7500-polyisobutyl and C8-C7500-polyisobutenyl, where at least one of R1 to R5 is a C8-C7500-polyisobutyl or C8-C7500-polyiso-butenyl group, and
R6 is hydrogen or methyl, and
(B) an acrylate monomer of the formula (II)

OG Complex Work Unit Chemistry
where
R7 is hydrogen or methyl, and R8 is a C1-36 alkyl.