Lubricating oil compositions

Patent metadata

Field	Value
Publication number	US-10865359-B2
Application number	US-201816201009-A
Country	US
Kind code	B2
Filing date	Nov 27, 2018
Priority date	Nov 29, 2017
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A lubricating composition comprises a major amount of an oil of lubricating viscosity and 0.01 to 25 percent by weight, based on the weight of the composition, of a poly(2-oxazoline) polymer. The polymer has the repeat unit:

—N(COR 1 )CH 2 CH 2 —

wherein the number of repeat units (n) in the polymer is an integer between 4 and 1000, such as between 4 and 500. The polymer carries an inorganic or organic nucleophilic polymerisation terminating group (t), and an initiator group (i) connected to the N atom of a repeat unit, the initiator group (i) being effective to initiate the polymerisation of linear, branched or cyclic hydrocarbyl moieties. At least 5% of the total number of the groups R 1 in the polymer comprise alkenyl groups having between 15 and 20 carbon atoms.

First claim

What is claimed is:

1. A lubricating composition for the lubricating the crankcase of spark-ignited or compression-ignited internal combustion engines comprising a major amount of an oil of lubricating viscosity and 0.01 to 25 percent by weight, based on the weight of the composition, of a poly(2-oxazoline) polymer having the repeat unit:
—N(COR 1 )CH 2 CH 2 —

wherein each R 1 is independently selected from C 1 to C 50 hydrocarbyl; and the number of repeat units (n) in the polymer is an integer between 4 and 1000;
wherein the polymer carries an inorganic or organic nucleophilic polymerisation terminating group (t), and an initiator group (i) connected to the N atom of a repeat unit, the initiator group (i) being effective to initiate the polymerisation of linear, branched or cyclic hydrocarbyl moieties; and

wherein at least 5% of the total number of the groups R 1 in the polymer comprise alkenyl groups having between 15 and 20 carbon atoms; and
wherein said lubricating oil composition further comprises minor amounts of at least one additive selected from dispersants, metal detergents and anti-wear agents.

2. A lubricating composition according to claim 1 wherein at least 20% of the total number of the groups R 1 in the polymer comprise alkenyl groups having between 15 and 20 carbon atoms.

3. A lubricating composition according to claim 1 wherein at least 5% of the total number of the groups R 1 in the polymer comprise alkenyl groups having 17 carbon atoms.

4. A lubricating composition according to claim 1 wherein groups R 1 comprise a mixture of singly, doubly and triply-unsaturated C 17 alkenyl groups which mixture predominates in singly and doubly-unsaturated C 17 alkenyl groups.

5. A lubricating composition according claim 1 wherein groups R 1 are obtained from natural fatty acids.

6. A lubricating composition according to claim 1 wherein n is between 4 and 400.

7. A lubricating composition according to claim 6 wherein n is between 10 and 300.

8. A lubricating composition according to claim 1 wherein the polymer is a copolymer.

9. A lubricating composition according to claim 1 wherein the polymer has a star architecture with three or more arms, and a molecular weight of 5,000-500,000 g/mol, as measured by Gel Permeation Chromatography with reference to linear narrow poly(methylmethacrylate) standards in the range of 550 to 600,000 g/mol.

10. A lubricating composition according to claim 1 comprising one or more co-additives, different from the oil-soluble poly(2-oxazoline) polymer, selected from one or more phosphorus-containing compounds; oxidation inhibitors or anti-oxidants; friction modifiers and viscosity modifiers.

11. A lubricating composition according to claim 1 comprising at least 60% by weight of an oil of lubricating viscosity.

12. A method of lubricating the crankcase of an internal combustion engine comprising operating the engine and lubricating the crankcase with a lubricating oil composition of claim 1 .

Assignees

• Infineum Int Ltd

Inventors

• Schwarz Andrew D
• Hartweg Manuel
• Cattoz Beatrice
• Phillips Daniel J
• Strong Anthony J
• Becer Remzi

Classifications

• C10M2207/125

  having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids · CPC title

• C10M107/44 Primary

  Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• C10M107/02

  Hydrocarbon polymers; Hydrocarbon polymers modified by oxidation · CPC title

• C10N2040/08

  Hydraulic fluids, e.g. brake-fluids · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title