US 11,981,877 B2
Acrylate-olefin copolymers as high viscosity base fluids
Emily Clare Schweißinger, Dortmund (DE); Stefan Karl Maier, Ober-Ramstadt (DE); Katja Nothdurft, Haltern am See (DE); Yvonne Groß-Onnebrink, Raesfeld (DE); Dieter Janßen, Gross-Umstadt (DE); Holger Pletsch, Frankfurt (DE); Stefan Hilf, Zwingenberg (DE); Denise Kleinschmidt, Duesseldorf (DE); and Sebastian Babik, Duesseldorf (DE)
Assigned to Evonik Operations GmbH, Essen (DE)
Filed by Evonik Operations GmbH, Essen (DE)
Filed on May 22, 2023, as Appl. No. 18/200,043.
Claims priority of application No. 22174980 (EP), filed on May 24, 2022.
Prior Publication US 2023/0383212 A1, Nov. 30, 2023
Int. Cl. C10M 145/14 (2006.01); C08F 220/18 (2006.01); C10M 169/04 (2006.01); C10N 20/02 (2006.01); C10N 20/04 (2006.01); C10N 40/04 (2006.01); C10N 40/08 (2006.01); C10N 40/25 (2006.01); C10N 50/10 (2006.01)
CPC C10M 145/14 (2013.01) [C08F 220/1808 (2020.02); C08F 220/1809 (2020.02); C10M 169/041 (2013.01); C08F 2800/20 (2013.01); C10M 2203/003 (2013.01); C10M 2209/084 (2013.01); C10N 2020/02 (2013.01); C10N 2020/04 (2013.01); C10N 2040/04 (2013.01); C10N 2040/08 (2013.01); C10N 2040/25 (2013.01); C10N 2050/10 (2013.01)] 22 Claims
 
1. A copolymer, comprising:
a) 70 to 95% by weight, based on a total weight of the copolymer, of monomer units derived from an acrylate of formula (I),

OG Complex Work Unit Chemistry
wherein R1 means a linear or branched alkyl group having from 4 to 18 carbon atoms and is selected from the group consisting of a C4 linear alkyl group, a C6-C10 linear alkyl group, a C8-C18 branched alkyl group, a C11-C18 linear alkyl group, and a mixture thereof, and
wherein the monomer units derived from the acrylate of formula (I) comprises
0 to 45% by weight of an acrylate of formula (I) wherein R1 is a C4 linear alkyl group;
0 to 95% by weight of an acrylate of formula (I) wherein R1 is a C6-C10 linear alkyl group;
0 to 95% by weight of an acrylate of formula (I) wherein R1 is a C8-C18 branched alkyl group;
0 to 45% by weight of an acrylate of formula (I) wherein R1 is a C11C18 linear alkyl group; or
a mixture thereof, based on the total weight of the copolymer,
b) 5 to 30% by weight, based on the total weight of the copolymer, of monomer units derived from at least one non-functionalized alpha-olefin of formula (II),

OG Complex Work Unit Chemistry
wherein R2 means a linear alkyl group having from 2 to 4 carbon atoms, and wherein the copolymer has a weight-average molecular weight from 5,000 to 35,000 g/mol according to DIN 55672-1.