Lubricating oil compositions

Patent metadata

Field	Value
Publication number	US-2018251700-A1
Application number	US-201815907320-A
Country	US
Kind code	A1
Filing date	Feb 28, 2018
Priority date	Mar 1, 2017
Publication date	Sep 6, 2018
Grant date	—

Abstract

A lubricating oil composition, a method of reducing low-speed pre-ignition (LSPI) in a direct-injected spark-ignited internal combustion engine, and a use of a lubricant composition to reduce UPI events in such an engine. Preferably, the composition comprises a detergent package comprising a borated calcium detergent, wherein the detergent package provides a calcium content in the composition of at least 0.12 mass %, based on the total mass of the composition, and wherein the borated calcium detergent provides a boron content in the composition of at least 100 ppmm, based on the total mass of the composition. Optionally, the composition comprises a first detergent comprising a calcium detergent, and a second detergent comprising a borated calcium detergent.

First claim

What is claimed is:

1 . A lubricating oil composition comprising a first detergent comprising a calcium detergent and a second detergent comprising a berated calcium detergent; wherein, the first and second detergents together provide a calcium content, as measured by ASTM 4951, in the lubricating oil composition of at least 0.12 mass %, based on the total mass of the lubricating oil composition, and wherein the second detergent provides a boron content, as measured by ASTM D5185, in the lubricating oil composition of at least 100 ppmm, based on the total mass of the lubricating oil composition.

2 . A lubricating oil composition according to claim 1 , wherein the first detergent has a calcium content of from 2 mass % to 16 mass %, based on the mass of the first detergent, and/or the second detergent has a calcium content of from 4 mass % to 16 mass %, based on the mass of the second detergent,

3 . A lubricating oil composition according to claim 1 , wherein the second detergent has a boron content of from 1 mass % to 10 mass %, based on the mass of the second detergent.

4 . A lubricating oil composition according to claim 1 , wherein the first and second detergents together provide a calcium content in the lubricating oil composition of at least 0.14 mass, based on the total mass of the lubricating oil composition.

5 . A lubricating oil composition according to claim 1 , wherein the second detergent provides a boron content in the lubricating oil composition of at least 150 ppmm, based on the total mass of the lubricating oil composition.

6 . A lubricating oil composition according to claim 1 , wherein:
the first detergent comprises a calcium phenate, a calcium sulfonate and/or a calcium salicylate; and the second detergent comprises a borated calcium phenate, a borated calcium sulfonate and/or a borated calcium salicylate.

7 . A lubricating oil composition according to claim 1 , wherein the second detergent comprises a borated analogue of the calcium detergent of the first detergent.

8 . A lubricating oil composition according to claim 1 , wherein the second detergent comprises calcium and boron in a calcium mass % to boron mass % ratio of 1:Z, based on the mass of the second detergent, wherein Z is at least 0.1.

9 . A lubricating oil composition according to claim 8 , wherein Z is from 0.1 to 4.

10 . A lubricating oil composition according to claim 1 , wherein the first detergent and the second detergent are present in a ratio of first detergent mass % to second detergent mass % of 1:X, based on the total mass of the lubricating oil composition, wherein X is at least 0.1.

11 . A lubricating oil composition according to claim 10 , wherein X is from 0.1 to 10.

12 . A lubricating oil composition according to claim 1 , wherein at least 50%, of the boron content of the lubricating oil composition is provided by the second detergent.

13 . A lubricating oil composition according to claim 12 , wherein 100%; of the boron content of the lubricating oil composition is provided by the second detergent.

14 . A method of reducing low-speed pre-ignition (LSPI) events in a direct-injection spark-ignition internal combustion engine comprising lubricating the crankcase of the engine with a lubricating oil composition, the composition comprising a detergent package comprising a borated calcium detergent; wherein, the detergent package provides a calcium content, as measured by ASTM 4951, in the lubricating oil composition of at least 0.12 mass %, based on the total mass of the lubricating oil composition, and wherein the borated calcium detergent provides a boron content, as measured by ASTM D5185, in the lubricating oil composition of at least 100 ppmm, based on the total mass of the lubricating oil composition.

15 . A method according to claim 14 , wherein, in operation, the engine generates a break mean effective pressure level of greater than 1,500 kPa, at engine speeds of from 1,000 to 2,500 rotations per minute (rpm).

16 . A method according to claim 14 , wherein the borated calcium detergent comprises a borated overbased calcium detergent and has a TBN of at least 150 mg KOH/g, as measured by ASTM D2896.

17 . A method according to claim 14 , wherein the detergent package additionally comprises a further detergent.

Assignees

• Infineum Int Ltd

Inventors

• Hartley Joseph P
• Young Anne W

Classifications

• C10N2040/255

  Gasoline engines · CPC title

• C10N2040/25

  Internal-combustion engines · CPC title

• C10N2060/14

  by boron or a compound containing boron · CPC title

• C10N2030/04

  Detergent property or dispersant property · CPC title

• C10N2040/10

  Running-in-oil {; Grinding} · CPC title