# US 10,865,359 B2 · Lubricating oil compositions

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- Number: US 10,865,359 B2
- Document ID: US10865359B2
- Status: Granted
- Kind: B2
- Application number: 16/201,009
- Filed: 2018-11-27
- Published: 2019-05-30
- Granted: 2020-12-15
- Earliest claimed: 2017-11-29
- Assignees: Infineum International Limited
- Applicants: Infineum International Limited
- Inventors: Andrew D. Schwarz; Manuel Hartweg; Beatrice Cattoz; Daniel J. Phillips; Anthony J. Strong; Remzi Becer
- Web page: https://patentgrep.com/patent/US10865359B2

## CPC

- C10M 149/12: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C08G 73/0233: {Polyamines derived from (poly)oxazolines, (poly)oxazines or having pendant acyl groups}
- C10M 169/041: {the additives being macromolecular compounds only}
- C10M 2203/1006: used as base material
- C10M 2203/1025: used as base material
- C10M 2205/003: used as base material
- C10M 2217/044: Polyamides
- C10M 2217/046: Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
- C10M 2223/00: Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10N 2020/04: Molecular weight; Molecular weight distribution
- C10N 2020/067: {Unsaturated Compounds}
- C10N 2020/073: {Star shaped polymers}
- C10N 2030/02: Pour-point; Viscosity index
- C10N 2030/06: Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
- C10N 2030/68: {Shear stability}
- C10N 2040/10: Running-in-oil {; Grinding}
- C10N 2040/25: Internal-combustion engines
- C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS

## 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(COR1)CH2CH2— 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 R1 in the polymer comprise alkenyl groups having between 15 and 20 carbon atoms.

## Claims

### Claim 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(COR1)CH2CH2—
wherein each R1 is independently selected from C1 to C50 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 R1 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.

### Claim 2 (depends on 1)

A lubricating composition according to claim 1 wherein at least 20% of the total number of the groups R1 in the polymer comprise alkenyl groups having between 15 and 20 carbon atoms.

### Claim 3 (depends on 1)

A lubricating composition according to claim 1 wherein at least 5% of the total number of the groups R1 in the polymer comprise alkenyl groups having 17 carbon atoms.

### Claim 4 (depends on 1)

A lubricating composition according to claim 1 wherein groups R1 comprise a mixture of singly, doubly and triply-unsaturated C17 alkenyl groups which mixture predominates in singly and doubly-unsaturated C17 alkenyl groups.

### Claim 5 (depends on 1)

A lubricating composition according claim 1 wherein groups R1 are obtained from natural fatty acids.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 6)

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

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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.

### Claim 10 (depends on 1)

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.

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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.