Marine engine lubrication

Patent metadata

Field	Value
Publication number	US-11732210-B2
Application number	US-201816205383-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Dec 1, 2017
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

An additive concentrate package for a marine engine cylinder lubricant is made by mixing an oil of lubricating viscosity, a metal detergent and an oil-soluble alkoxylated alcohol.

First claim

What is claimed is:

1. A method of preparing an additive concentrate for a marine engine lubricating oil composition having both viscosity stability at 60° C. and rust inhibitory characteristics:
(i) comprising the steps of providing as separate additive components:
(A) at least one overbased metal detergent; and
(B) an oil-soluble alkoxylated alcohol, having an HLB in the range 7-9.5, represented by the formula R[O—(CH 2 ) x ] y —OH
where R is a linear alkyl group having from 12 to 20 carbon atoms, x is an integer from 1 to 10, and y is an integer from 2 to 10; the ratio of x to y being such as to provide an HLB in the above range; and

(ii) admixing an oil of lubricating viscosity in a concentrate-forming amount with additive comprising additive components (A) and (B), so as to provide a marine engine lubricating oil composition having both viscosity stability at 60° C. and rust inhibitory characteristics.

2. The method of claim 1 wherein the additive concentrate contains from 2.5 to 90 mass % of additive.

3. The method of claim 1 wherein the additive concentrate contains from 0.25 to 5 mass % of additive (B).

4. A viscosity-growth-stable and rust inhibitory additive concentrate obtained by the method of claim 1 .

5. A two-stroke engine marine cylinder lubricating oil composition comprising an oil of lubricating viscosity in a major amount blended with a minor amount of the viscosity-growth-stable and rust inhibitory additive concentrate claimed in claim 4 , where the composition has a TBN of 10-200 mg KOH/g, a passing rust test result according to ASTM D6658, and a viscosity increase when stored for eight weeks at 60° C. according to ASTM D445 of at most 47.2%.

6. The composition of claim 5 comprising 10 to 65 mass % of the additive concentrate.

7. The composition of claim 6 comprising 12 to 50 mass % of the additive concentrate.

8. The composition of claim 7 comprising 13 to 25 mass % of the additive concentrate.

9. The composition of claim 5 containing 0.1 to 3 mass % of additive (B).

10. The composition of claim 5 including at least 60 mass % of the oil of lubricating viscosity.

11. The additive concentrate of claim 4 wherein (A) is an overbased calcium phenate detergent and/or an overbased calcium sulfonate detergent, or is a complex detergent comprising sulfonate and phenate surfactants.

12. The additive composition of claim 5 wherein (A) is an overbased calcium phenate detergent and/or an overbased calcium sulfonate detergent, or is a complex detergent comprising sulfonate and phenate surfactants.

13. The additive concentrate of claim 4 wherein x is 2 and y is 4.

14. The additive composition of claim 5 wherein x is 2 and y is 4.

15. The additive concentrate or composition of claim 4 wherein (B) comprises a polyoxyethylene (4) lauryl ether.

16. The additive composition of claim 5 wherein (B) comprises a polyoxyethylene (4) lauryl ether.

17. A method of operating a two-stroke marine engine in which the engine is lubricated by the composition of claim 5 during its operation.

18. The additive composition of claim 5 , wherein the TBN is 40-140 mg KOH/g.

Assignees

• Infineum Int Ltd

Inventors

• Renouf Louise
• Taylor Stuart A
• Woodward Philip J

Classifications

• C10M169/044 Primary

  the additives being a mixture of non-macromolecular and macromolecular compounds · CPC title

• C10M129/54

  containing hydroxy groups · CPC title

• C10M135/10

  Sulfonic acids or derivatives thereof · CPC title

• C10M145/36

  etherified · CPC title

• C10M161/00

  Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential · CPC title