Random copolymers for use as base oils or lubricant additives
AssigneeEvonik Operations GmbH
InventorsHolger Pletsch, Emily Clare Schweissinger, Hanna Spohr, Sebastian Reimann, Lars Pera, Marius Weiland, Boris Eisenberg, Dmitriy Shakhvorostov
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Abstract
The invention relates to random copolymers comprising monomers derived from conjugated dienes and alkyl (meth)acrylates, a method for manufacturing the copolymers, lubricant compositions comprising the copolymers, and the use of the copolymers as additives for lubricant compositions or as a base oil for lubricant compositions. The copolymers are favorably used for driving system lubricating oils, hydraulic oils, engine oils and industrial oil formulations.
Claims20
A random copolymer, obtainable by polymerizing a monomer composition comprising:
- (a) 5 to 55 mol-% of one or more conjugated dienes having 6 carbon atoms or less per molecule;
- (b) 10 to 45 mol-% of one or more C1-C6 alkyl(meth)acrylates;
- (c) 10 to 70 mol-% of one or more C7-C24 alkyl(meth)acrylates;
- (d) 0 to 10 mol-% of one or more esters of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;
- and
- (e) 0 to 10 mol-% of one or more 1-alkenes comprising 6 to 16 carbon atoms;
- based on the total amount of monomers in the monomer composition;
- wherein the monomer units derived from the conjugated dienes are hydrogenated and the copolymer has a weight-average molecular weight of 5,000 to 20,000 g/mol;
- and
- wherein the sum of all components (a) to (d) adds up to at least 90 mol-%, based on the total amount of monomers in the monomer composition.
Dependencies are inferred from the claim text.