Lubricating oil additives

Patent metadata

Field	Value
Publication number	US-10407639-B2
Application number	US-201715622140-A
Country	US
Kind code	B2
Filing date	Jun 14, 2017
Priority date	Jun 14, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A lubricating composition comprises an oil-soluble poly(2-oxazoline) additive having the repeat unit:

—N(COR 1 )CH 2 CH 2 —
where the number of repeat units (n) is an integer between 4 and 1000; where the polymer carries an inorganic or organic nucleophilic polymerization terminating group t, and a linear, branched or cyclic hydrocarbyl polymerization initiator group (i); and where R 1 comprises a single or a mixture of linear branched or cyclic hydrocarbyl groups having 1-100 carbon atoms, some or all having 12-100 carbon atoms, or of at least one macro-monomeric hydrocarbyl group with more than 50 carbon atoms provided that when the polymer is a homopolymer and R 1 lacks any hetero atoms; (A) i has a molecular weight of less than 250 g/mol, and R 1 has an average number of carbon atoms of 12 to 50; or (B) n is greater than 15.

The polymer may provide the composition, in the form of a lubricant, with friction modifier, and with low impact on lubricant viscosity.
The polymer may be a homopolymer, a block copolymer or a star polymer.

First claim

What is claimed is:

1. A lubricating composition comprising an oil-soluble poly(2-oxazoline) additive having the repeat unit:
—N(COR 1 )CH 2 CH 2 —

where the number of repeat units (n) is an integer between 4 and 1000;
where the polymer carries an inorganic or organic nucleophilic polymerisation terminating group (t), and a linear, branched or cyclic hydrocarbyl polymerisation initiator group (i); and
where R 1 comprises a single or a mixture of linear, branched or cyclic hydrocarbyl groups having 1-100 carbon atoms, some or all having 12-100 carbon atoms, or of at least one macro-monomeric hydrocarbyl group with more than 50 carbon atoms;
provided that when the polymer is a homopolymer and R 1 lacks any hetero atoms:
(A) (i) has a molecular weight of less than 250 g/mol, and R 1 has an average number of carbon atoms of 12 to 50; or
(B) n is greater than 15.

2. A lubricating composition of claim 1 where the polymer has a block architecture, W having at least some groups with 12-100 carbon atoms in at least one block, and n is an integer of from 10-1000.

3. A lubricating composition according to claim 2 wherein R 1 contains 1 to 75 carbon atoms, provided that some or all of the groups R 1 have 12 to 75 carbon atoms.

4. A lubricating composition according to claim 2 wherein n is between 4 and 400.

5. A lubricating composition according to claim 3 wherein n is between 4 and 400.

6. A lubricating composition of claim 1 where the polymer has a star architecture with three or more arms, and a molecular weight of 10,000-500,000, R 1 having at least some groups of 12-100 carbon atoms in at least one arm, and n is an integer from 10-1000.

7. A lubricating composition according to claim 1 in the form of a concentrate of the polymer in an oil.

8. A lubricating composition according to claim 7 wherein the polymer is present in the oil in an amount of between 30 and 50 percent by weight based on the weight of the composition.

9. A lubricating composition according to claim 1 in the form of a lubricating oil composition comprising a major amount of an oil of lubricating oil viscosity and as an additive, a minor amount of the polymer.

10. A lubricating composition according to claim 9 wherein the polymer is present in the oil of lubricating viscosity in an amount of 0.01 to 25 percent by weight, based on the weight of the composition of the polymeric material.

11. A lubricating composition according to claim 7 comprising one or more co-additives, different from the polymer additive, selected from one or more dispersants, detergents, anti-oxidants, anti-wear agents, friction modifiers, and viscosity modifiers.

12. A lubricating composition according to claim 9 comprising one or more co-additives, different from the polymer additive, selected from one or more dispersants, detergents, anti-oxidants, anti-wear agents, friction modifiers, and viscosity modifiers.

13. 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 9 .

14. A lubricating composition comprising an oil-soluble poly(2-oxazoline) additive having the repeat unit:
—N(COR 1 )CH 2 CH 2 —

where the number of repeat units (n) is an integer between 16 and 1000;
where the polymer carries an inorganic or organic nucleophilic polymerisation terminating group (t), and a linear, branched or cyclic hydrocarbyl polymerisation initiator group (i), provided that (i) is not a polyolefin having a molecular weight of 250 g/mol or more.

15. A lubricating composition of claim 14 where the polymer has a block architecture, R 1 having at least some groups with 12-100 carbon atoms in at least one block, and n is an integer of from 10-1000.

16. A lubricating composition according to claim 15 wherein R 1 contains 1 to 75 carbon atoms, provided that some or all of the groups R 1 have 12 to 75 carbon atoms.

17. A lubricating composition according to claim 15 wherein n is between 4 and 400.

18. A lubricating composition according to claim 16 wherein n is between 4 and 400.

19. A lubricating composition of claim 14 where the polymer has a star architecture with three or more arms, and a molecular weight of 10,000-500,000, R 1 having at least some groups of 12-100 carbon atoms in at least one arm, and n is an integer from 10-1000.

20. A lubricating composition according to claim 14 in the form of a concentrate of the polymer in an oil.

21. A lubricating composition according to claim 20 wherein the polymer is present in the oil in an amount of between 30 and 50 percent by weight based on the weight of the composition.

22. A lubricating composition according to claim 14 in the form of a lubricating oil composition comprising a major amount of an oil of lubricating oil viscosity and as an additive, a minor amount of the polymer.

23. A lubricating composition according to claim 22 wherein the polymer is present in the oil of lubricating viscosity in an amount of 0.01 to 25 percent by weight, based on the weight of the composition of the polymeric material.

24. A lubricating composition according to claim 20 comprising one or more co-additives, different from the polymer additive, selected from one or more dispersants, detergents, anti-oxidants, anti-wear agents, friction modifiers, and viscosity modifiers.

25. A lubricating composition according to 22 comprising one or more co-additives, different from the polymer additive, selected from one or more dispersants, detergents, anti-oxidants, anti-wear agents, friction modifiers, and viscosity modifiers.

26. 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 22 .

Assignees

• Infineum Int Ltd
• Infineon Int Ltd

Inventors

• Schwarz Andrew D
• Hartweg Manuel
• Becer Remzi

Classifications

• C10N2070/02

  Concentrating of additives · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2030/68

  Shear stability · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2020/073

  Star shaped polymers · CPC title