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US 2020/0224116 A1Published application
Comb polymers for improving noack evaporation loss of engine oil formulations
AssigneeEvonik Operations GmbH
InventorsKatrin Schöller, Stefan Maier, Sarah Lippert, Klaus Schimossek
Life of this patent
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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.
Claims20
1:
- 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;
- and
- (b) 0.5% to 11% by weight of at least one C4-18 alkyl acrylate.
1 more element
2:
- The polyalkyl(meth)acrylate based comb polymer according to claim 1, 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) 550/6 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.
5 more elements
3:
- The polyalkyl(meth)acrylate based comb polymer according to claim 1, comprising as component (b) 0.5 to 5% by weight, of at least one C4-18 alkyl acrylate.
4:
- The polyalkyl(meth)acrylate based copolymer according to claim 1, having a weight-average molecular weight Mw in the range of 200,000 to 800,000 g/mol, determined by size exclusion chromatography (SEC) using commercially available polymethylmethacrylate standards.
5:
- The polyalkyl(meth)acrylate based copolymer according to claim 1, wherein the hydroxylated hydrogenated polybutadiene of component (a) has a number-average molecular weight Mn to DIN 55672-1 of 4,000 to 6,000 g/mol.
6:
- The polyalkyl(meth)acrylate based copolymer according to claim 1, having a PSSI of not more than 7, calculated according to ASTM D 6022-01 based on data measured according to ASTM D 2603-B.
7:
- A method of reducing Noack evaporation loss of a lubricating oil composition, the method comprising:
- applying the polyalkyl(meth)acrylate based comb polymer of claim 1 to a lubricating oil composition in need thereof.
8:
- 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;
- and
- (b) 0.5% to 11% by weight of at least one C4-18 alkyl acrylate.
3 more elements
9:
- The additive composition according to claim 8, 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.
8 more elements
10:
- The additive composition according to claim 8, having a VI of at least 245.
11:
- The additive composition according to claim 8, wherein component (A) is present in an amount of 70 to 75% by weight and component (B) is present in an amount of 25 to 30% by weight.
12:
- The additive composition according to claim 8, wherein component (A) comprises:
- (A1) 54 to 80% by weight of at least one base oil selected from the group consisting of API Group I oils, Group II oils, Group III oils, Group IV oils and any mixture thereof, and
- (A2) 0 to 6% by weight of at least one API Group V oil,
- based on the total weight of the additive composition.
1 more element
13:
- A method of reducing Noack evaporation loss of a lubricating oil composition compositions the method comprising:
- applying the additive composition of claim 8 to a lubricating oil composition in need thereof.
14:
- A lubricating oil composition, comprising:
- (A) 75 to 99.5% by weight of a base oil;
- (B) 0.5 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;
- and
- (C) 0 to 15% by weight of one or more further additives.
4 more elements
15:
- The lubricating oil composition according to claim 14, comprising:
- (A) 75 to 99.5% by weight of a base oil;
- (B) 0.5 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.
8 more elements
16:
- The lubricating oil composition according to claim 14, wherein component (A) comprises:
- (A1) 74.25 to 99.45% by weight of at least one base oil selected from the group consisting of API Group I oils, Group II oils, Group III oils, Group IV oils and any mixture thereof, and
- (A2) 0.05 to 0.75% by weight of at least one API Group V oil,
- based on the total weight of the lubricating oil composition.
1 more element
17:
- The lubricating oil composition according to claim 14, wherein component (C) is at least one selected from the group consisting of conventional VI improvers, dispersants, defoamers, detergents, antioxidants, pour point depressants, antiwear additives, extreme pressure additives, friction modifiers, anticorrosion additives, dyes and any mixtures thereof.
18:
- The polyalkyl(meth)acrylate based copolymer according to claim 1, having a weight-average molecular weight Mw in the range of 300,000 to 600,000 g/mol, determined by size exclusion chromatography (SEC) using commercially available polymethylmethacrylate standards.
19:
- The polyalkyl(meth)acrylate based copolymer according to claim 1, having a PSSI of below 3, calculated according to ASTM D 6022-01 based on data measured according to ASTM D 2603-B.
20:
- The additive composition according to claim 8, wherein component (A2) comprises dioctylsebacate (DIOS).