Fatty amine salts as friction modifiers for lubricants

Patent metadata

Field	Value
Publication number	US-9487728-B2
Application number	US-201415027476-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Oct 25, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

The present invention relates to the use of a partly neutralized fatty amine salt where the fatty amine is having the formula where R is a hydrocarbyl group having 12-24 carbon atoms; X is H, a C1-C4 alkyl group, benzyl or —CH 2 CH 2 CH 2 NH 2 , m is 2 or 3 and n is 0-3, provided that when n is 0, then X IS —CH 2 CH 2 CH 2 NH 2 , and m is 3; and where the acid neutralizing the fatty amine has the formula R′COOH (II), where R′CO is an acyl group having 16-24 carbon atoms; and where the molar ratio between the moles of nitrogen atoms in the fatty amine and the moles of fatty acid is 5:1 to 1.25:1; as a friction modifier for a lubricating oil, especially for an internal combustion engine. The invention also relates to a lubricating oil composition comprising the partly acid neutralized product (I), and to a method for lubrication of interfacing mutually movable surfaces by bringing the surfaces into contact with the said lubricating oil.

First claim

The invention claimed is:

1. A method of modifying the friction of a lubricating oil with a partly neutralised fatty amine salt where the fatty amine is having the formula

where R is a hydrocarbyl group having 12-24; X is H, a C1-C4 alkyl group, preferably; m is 2 or 3, and n is 0-3, provided that when n is 0, then X is —CH 2 CH 2 CH 2 NH 2 , and m is 3; and where the acid neutralising the fatty amine has the formula R′COOH (II), where R′CO is an acyl group having 16-24 carbon atoms; and where the molar ratio between the moles of nitrogen atoms in the fatty amine and the moles of fatty acid is 5:1 to 1.25:1.

2. The method of claim 1 wherein the lubricating oil is an internal combustion engine or a gearbox lubricating oil.

3. The method of claim 1 wherein m is 3, X is —CH 2 CH 2 CH 2 NH 2 and n is 0, and the fatty acid is oleic acid.

4. The method of claim 1 wherein m is 3 and n is 1 and the fatty acid is oleic acid.

5. A lubricating oil composition comprising 0.05-5% by weight, based on the total weight of the composition, of the partly neutralized fatty amine salt as defined in claim 1 .

6. A composition according to claim 5 comprising
a) a base oil belonging to Group I-V according to the categorization API 1509, Appendix E
b) 0.05-5% by weight, based on the total weight of the composition, of the partly neutralized amine salt between the fatty amine having formula (I) and a carboxylic acid having formula (II) as defined in claim 1 .

7. A composition according to claim 6 wherein the molar ratio between the moles of nitrogen atoms in the fatty amine (I) and the moles of fatty acid (II) is 2.5:1 to 1.5:1.

8. A composition according to claim 7 further comprising a corrosion inhibitor, an anti-wear additive and a viscosity index improver.

9. A composition according to claim 6 , comprising at least 70, by weight, based on the total weight of the composition, of said base oil.

10. A composition according to claim 6 , comprising at most 1% by weight, based on the total weight of the composition, of water.

11. A method for lubrication of interfacing mutually movable surfaces by bringing the surfaces into contact with a lubricating oil composition as described in claim 5 .

12. A method according to claim 11 where the surfaces are parts of an internal combustion engine or a gearbox.

13. The method of claim 1 wherein X is chosen form the group consisting of a methyl group, benzyl or —CH 2 CH 2 CH 2 NH 2 .

Assignees

• Akzo Nobel Chemicals Int Bv

Inventors

• Lundgren Sarah

Classifications

• C10M133/06 Primary

  having amino groups bound to acyclic or cycloaliphatic carbon atoms · CPC title

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10N2030/06

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

• C10N2030/54

  Fuel economy · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title