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US 11,618,797 B2Granted
Acrylate-olefin copolymers as high viscosity base fluids
AssigneeEvonik Operations GmbH
InventorsStefan Karl Maier, Dieter Janßen, Fabian Ziegler, Katrin Schöller, Stefan Hilf
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Abstract
The invention relates to acrylate-olefin copolymers and to a method for preparing these polymers. The present invention is also directed to lubricant compositions comprising these copolymers, and to the use of these copolymers as a lubricant additive or a synthetic base fluid in a lubricating oil composition, preferably in a gear oil composition, a transmission oil composition, a hydraulic oil composition, an engine oil composition, a marine oil composition, an industrial lubricating oil composition or in grease.
Claims19
A copolymer comprising:
- a) from 65 to 90% by weight, based on the total weight of the copolymer, of monomer units derived from at least one acrylate of Formula (I),
- wherein R1 means a linear or branched alkyl group having from 6 to 12 carbon atoms,
- b) from 10 to 35% 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),
- wherein R2 means a linear alkyl group having from 6 to 16 carbon atoms,
- and
- c) from 0 to 10% by weight of monomer units derived from at least one monomer selected from the list consisting of methacrylamides, fumarates, maleates or a mixture thereof, based on the total weight of the copolymer;
- and
- wherein the copolymer has a kinematic viscosity from 80 to 600 cSt at 100° C. according to ASTM D 445, and
- wherein the copolymer comprises from 0 to 22% by weight of monomer units derived from monomers with linear alkyl group having more than 8 carbon atoms, based on the total weight of the copolymer, and wherein the copolymer of the invention has a COC flash point above 250° C. according to ASTM D92.
6 more elements
Dependencies are inferred from the claim text.