Lubricant for a two-stroke marine engine

Patent metadata

Field	Value
Publication number	US-10689592-B2
Application number	US-201716073838-A
Country	US
Kind code	B2
Filing date	Feb 24, 2017
Priority date	Feb 29, 2016
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

Relating to the field of lubricant, more particularly relates to lubricant for marine engine, notably for a two-stroke marine engine. More particularly, relates to a lubricant for a marine engine including at least one lubricant base oil and at least one fatty amine.

First claim

The invention claimed is:

1. Lubricant composition comprising:
at least one lubricant base oil,
at least a di-fatty-alkyl(ene) polyalkylamine composition comprising one or more polyalkylamines of formulae (I) or (II):

wherein,
each R is, independent of the other R, an alkyl moiety or an alkylene moiety with 8 to 22 carbon atoms, which is linear or branched,
n and z are independent of each other either 0, 1, 2, or 3, and
when z is superior than 0 then o and p are independent of each other either 0, 1, 2, or 3,

or derivatives thereof,
whereby said polyalkylamine composition comprises at least 3% by weight of branched compounds of formula (I) or (II), with regards to the total weight of polyalkylamine compounds (I) and (II) in the composition, branched compound signifying that:
in formula (I) at least one of n and z are superior or equal to 1,
in formula (II) n is superior or equal to 1.

2. Lubricant composition according to claim 1 , wherein the polyalkylamine composition comprises at least 4% w/w of branched compounds of formula (I) or (II), with regards to the total weight of polyalkylamine compounds (I) and (II) in the composition, branched compound signifying that:
in formula (I) at least one of n or z are superior or equal to 1,
in formula (II) n is superior or equal to 1.

3. Lubricant composition according to claim 1 , wherein the polyalkylamine composition comprises at least 5% by weight, with regards to the total weight of compounds (I) and (II), of products of formulae (I) and (II) with a linear structure, linear meaning n is 0 in formulae (I) and (II) and z is 0 in formula (I).

4. Lubricant composition according to claim 1 , wherein the polyalkylamine composition further comprises derivatives of polyalkylamines of formula (I) or (II), wherein said derivatives are alkoxylates which are optionally methylated.

5. Lubricant composition according to claim 1 , wherein the polyalkylamine composition further comprises derivatives of polyalkylamines of formula (I) or (II), wherein said derivatives are methylated.

6. Lubricant composition according to claim 1 , wherein the polyalkylamine composition has a BN measured according to standard ASTM D-2896 from 150 to 350 milligrams of potash per gram of amine compound.

7. Lubricant composition according to claim 1 , having a BN, measured according to standard ASTM D-2896, greater than or equal to 70 milligrams of potash per gram of the lubricant composition.

8. Lubricant composition according to claim 7 , wherein the percentage by mass of di-fatty-alkyl(ene) polyalkylamine mixture with respect to the total weight of the lubricant composition is from 2 to 10%.

9. Lubricant composition according to claim 1 , having a BN determined according to the standard ASTM D-2896 of at most 50 milligrams of potassium hydroxide per gram of the lubricant composition.

10. Lubricant composition according to claim 9 , wherein the percentage by mass of di-fatty-alkyl(ene) polyalkylamine mixture with respect to the total weight of the lubricant composition is comprised between 0.1 and 15%.

11. Lubricant composition according to claim 1 , further comprising additives chosen amongst a neutral detergent, an overbased detergent or mixtures thereof.

12. Lubricant composition according to claim 1 , wherein the percentage by mass of di-fatty-alkyl(ene) polyalkylamine mixture with respect to the total weight of lubricant is chosen such that the BN provided by these compounds represents a contribution comprised between 5 and 60 milligrams of potash per gram of lubricant, determined according to the standard ASTM D-2896.

13. Lubricant composition according to claim 12 , wherein the percentage by mass of di-fatty-alkyl(ene) polyalkylamine mixture with respect to the total weight of lubricant is chosen such that the BN provided by these compounds represents a contribution comprised between 10 and 30 milligrams of potash per gram of lubricant of the total BN of said cylinder lubricant, determined according to the standard ASTM D-2896.

14. A method for lubricating a marine engine, comprising contacting the engine with a lubricant composition according claim 1 as a cylinder lubricant.

15. The method of claim 14 , wherein the engine is a two-stroke marine engine.

16. The method of claim 14 , comprising operating the engine with fuels having a content of sulphur inferior than 1% by weight relative to the total weight of fuel.

17. The method of claim 16 , comprising operating the engine with fuels having a content of sulphur inferior than 0.5% by weight relative to the total weight of fuel.

18. The method of claim 14 , comprising operating the engine with fuels having a content of sulphur from 1 to 3.5% by weight relative to the total weight of fuel.

19. The method of claim 14 for reducing the formation of deposits in the hot section of a marine engine.

Assignees

• Total Marketing Services

Inventors

• Doyen Valérie

Classifications

• C10N2030/52

  Base number [TBN] · CPC title

• C10N2020/075

  Dendrimers · CPC title

• C10M2215/04

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

• C10M2217/046

  Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers · CPC title

• C10M133/06 Primary

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