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US 11,015,139 B2Granted
Comb polymers for improving Noack evaporation loss of engine oil formulations
AssigneeEvonik Operations GmbH
InventorsKatrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
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Abstract
A comb polymer can be used for reducing a Noack evaporation loss of a lubricant composition, especially of an engine oil composition. Application of the comb polymer to the lubricant composition can bring about the desired reduction. The comb polymer can include specified amounts of macromonomer and alkyl acrylates. Resulting lubricant compositions can include the comb polymer.
Claims19
A polyalkyl(meth)acrylate based comb polymer, comprising the following monomers:
- (a) 10 to 25% by weight of at least one ester of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;
- (b) 0.5% to 11% by weight of at least one C4-18 alkyl acrylate;
- (c) 0% to 1% by weight of methyl methacrylate;
- (d) 55% to 70% by weight of n-butyl methacrylate;
- (e) 5% to 20% by weight of at least one C10-15 alkyl methacrylate;
- and
- (f) 0% to 2% by weight of styrene monomers,
- wherein the polyalkyl(meth)acrylate based comb polymer, if present in a lubricating oil composition, is present in a content of from 2 to 10 wt %.
5 more elements
An additive composition, comprising:
- (A) 60 to 80% by weight of a base oil, and
- (B) 20 to 40% by weight of a polyalkyl(meth)acrylate based comb polymer, comprising the following monomers:
- (a) 10 to 25% by weight of at least one ester of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;
- (b) 0.5% to 11% by weight of at least one C4-18 alkyl acrylate;
- (c) 0% to 1% by weight of methyl methacrylate;
- (d) 55% to 70% by weight of n-butyl methacrylate;
- (e) 5% to 20% by weight of at least one C10-15 alkyl methacrylate;
- and
- (f) 0% to 2% by weight of at least one styrene monomer.
6 more elements
A lubricating oil composition, comprising:
- (A) 75 to 98% by weight of a base oil;
- (B) 2 to 10% by weight of a polyalkyl(meth)acrylate based comb polymer, comprising the following monomers:
- (a) 10 to 25% by weight of at least one ester of (meth)acrylic acid and a hydroxylated hydrogenated polybutadiene;
- (b) 0.5% to 11% by weight of at least one C4-18 alkyl acrylate;
- (c) 0% to 1% by weight of methyl methacrylate;
- (d) 55% to 70% by weight of n-butyl methacrylate;
- (e) 5% to 20% by weight of at least one C10-15 alkyl methacrylate;
- (f) 0% to 2% by weight of at least one styrene monomer;
- and
- (C) 0 to 15% by weight of one or more further additives.
7 more elements
Dependencies are inferred from the claim text.