METHOD OF LUBRICATING AN INTERNAL COMBUSTION ENGINE

• US 20160326453A1
• Filed: 01/09/2015
• Published: 11/10/2016
• Est. Priority Date: 01/10/2014
• Status: Abandoned Application

• Current Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Inventors: Galic Raguz, Mary, Loop, John G.
• Application Number:
  US15/110,135
• Publication Number:
  US 20160326453A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C10M 161/00 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 Class Codes: C10M 163/00 Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
• CPC Class Codes: C10M 167/00 Lubricating compositions characterised by the additive being a mixture of a macromolecular compound, a non-macromolecular compound and a compound of unknown or incompletely defined constitution, each of these compounds being essential
• CPC Class Codes: C10M 2205/02 containing acyclic monomers
• CPC Class Codes: C10M 2205/022 Ethene
• CPC Class Codes: C10M 2205/024 Propene
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2207/028 Overbased salts thereof
• CPC Class Codes: C10M 2207/262 derived from hydroxy substituted aromatic acids, e.g. salicylates
• CPC Class Codes: C10M 2215/064 Di- and triaryl amines
• CPC Class Codes: C10M 2215/086 Imides
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2217/06 Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
• CPC Class Codes: C10M 2219/044 Sulfonic acids, Derivatives thereof, e.g. neutral salts
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/082 containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
• CPC Class Codes: C10M 2219/084 containing hydroxy groups; Derivatives thereof
• CPC Class Codes: C10M 2219/088 Neutral salts
• CPC Class Codes: C10M 2219/089 Overbased salts
• CPC Class Codes: C10M 2223/045 : Metal containing thio derivatives
• CPC Class Codes: C10N 2010/04 : Groups 2 or 12
• CPC Class Codes: C10N 2020/04 : Molecular weight; Molecular weight distribution
• CPC Class Codes: C10N 2030/04 : Detergent property or dispersant property
• CPC Class Codes: C10N 2030/06 : Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2030/10 : Inhibition of oxidation, e.g. anti-oxidants
• CPC Class Codes: C10N 2030/42 : Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/43 : Sulfur free or low sulfur content compositions
• CPC Class Codes: C10N 2030/45 : Ash-less or low ash content
• CPC Class Codes: C10N 2030/52 : Base number [TBN]
• CPC Class Codes: C10N 2040/252 : Diesel engines
• CPC Class Codes: C10N 2060/14 : by boron or a compound containing boron

Abstract

The invention provides a method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising: an oil of lubricating viscosity, a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40, 0.1 wt % to 4 wt % of a borated polyisobutylene succinimide dispersant, wherein the polyisobutylene from which the borated polyisobutylene succinimide is derived has a number average molecular weight of 550 to 1150, and 0.1 wt % to 6 wt % of a polyisobutylene succinimide, wherein the polyisobutylene from which polyisobutylene succinimide is derived has a number average molecular weight of 1550 to 2500, 0 wt % to 0.2 wt % of a phenolic based detergent, wherein the total amount of soap delivered by the alkaline earth metal sulphonate (typically calcium sulphonate) is 0.4 to 1 wt % of the lubricating composition, and wherein the lubricating composition has a sulphated ash content of not more than 1.5 wt %.

Claims

1-37. -37. (canceled)

38. A method of lubricating a compression-ignition internal combustion engine with a maximum laden mass over 2,700 kg comprising supplying to the engine a lubricating composition comprising:

an oil of lubricating viscosity,

a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40,

0.1 wt % to 4 wt % of a borated polyisobutylene succinimide dispersant, wherein the polyisobutylene from which the borated polyisobutylene succinimide is derived has a number average molecular weight of 550 to 1150, and

0.1 wt % to 6 wt % of a polyisobutylene succinimide, wherein the polyisobutylene from which polyisobutylene succinimide is derived has a number average molecular weight of 1550 to 2500,

0 wt % to 0.2 wt % of a phenolic based detergent,

the total amount of soap delivered by the 300 TBN or higher alkaline earth metal sulphonate is 0.4 to 1 wt % of the lubricating composition, and

the lubricating composition has a sulphated ash content of not more than 1.5 wt %.

39. The method of claim 38, wherein the lubricating composition has (i) a sulphur content of 0.5 wt % or less, (ii) a phosphorus content of 0.1 wt % or less, and (iii) a sulphated ash content of 0.5 wt % to 1.5 wt %.

40. The method of claim 38, wherein the lubricating composition has at least one of (i) a sulphur content of 0.2 wt % to 0.4 wt %, (ii) a phosphorus content of 0.08 wt % to 0.15 wt %, and (iii) a sulphated ash content of 0.5 wt % to 1.5 wt %.

41. The method of claim 39, wherein the lubricating composition has a sulphated ash content of 0.5 wt % to 1.2 wt %.

42. The method of claim 38, wherein the lubricating composition has a total base number (TBN) content of at least 5 mg KOH/g.

43. The method of claim 42, wherein the lubricating composition has a total base number (TBN) content of 7 to 10 mg KOH/g.

44. The method claim 38, wherein the 300 TBN or higher alkaline earth metal sulphonate detergent is a calcium sulphonate detergent and the total amount of soap delivered by the calcium sulphonate detergent is 0.5 to 0.8 wt % of the lubricating composition.

45. The method of claim 38, wherein the lubricating composition further comprises a 80 TBN or lower alkaline earth metal sulphonate detergent having a metal ratio of 1 to 5.

46. The method of claim 45, wherein the ratio of the 300 TBN or higher alkaline earth metal sulphonate detergent to the 80 TBN or lower alkaline earth metal sulphonate detergent is 80:

20 to 20;

80.

47. The method of claim 38, wherein the metal ratio of the 300 TBN or higher alkaline earth metal sulphonate detergent is 20 to 30.

48. The method of claim 38, wherein the 300 TBN or higher alkaline earth metal sulphonate detergent has a TBN of 350 to 500.

49. The method of claim 45, wherein the 80 TBN or lower alkaline earth metal sulphonate detergent has a metal ratio of 1 to 3.

50. The method of claim 45, wherein the 80 TBN or lower alkaline earth metal sulphonate detergent is a calcium sulphonate detergent having a TBN of 1 to 80.

51. The method of claim 38, wherein the lubricating composition comprises up to 0.1 wt % of a phenolic based detergent.

52. The method of claim 38, wherein the lubricating composition comprises 0 wt % of a phenolic based detergent.

53. The method of claim 38, wherein the lubricating composition further comprises a dispersant viscosity modifier.

54. The method of claim 53, wherein the dispersant viscosity modifier is present at 0.01 wt % to 3 wt %.

55. The method of any preceding claim 54, wherein the dispersant viscosity modifier is an olefin copolymer further functionalised with a dispersant amine group.

56. The method of claim 55, wherein the olefin copolymer is an ethylene-propylene copolymer.

57. The method of claim 55, wherein the olefin copolymer has a number average molecular weight of 5000 to 100,000, or 7500 to 60,000, or 8000 to 45,000.

58. The method of claim 53, wherein the dispersant amine group is derived from reacting the olefin copolymer with an acylating agent and an aromatic amine having a primary or secondary amino group.

59. The method of claim 58, wherein the aromatic amine comprises 4-aminodiphenylamine, aldehyde (typically formaldehyde) coupled 4-aminodiphenylamine, nitro-aniline, disperse orange-3 (DO3), or mixtures thereof.

61. The method of claim 38, wherein the lubricating composition further comprises an antioxidant, wherein the antioxidant comprises a phenolic or an aminic antioxidant or mixtures thereof, and wherein the antioxidant is present at 0.1 wt % to 3 wt %.

62. The method of claim 38, wherein the lubricating composition further comprises a phosphorus-containing antiwear agent, typically zinc dialkyldithiophosphate.

63. The method of claim 38, wherein the polyisobutylene succinimide is present at 2.5 wt % to 6 wt %.

65. The method of claim 38, wherein the polyisobutylene succinimide and the borated polyisobutylene succinimide have a carbonyl to nitrogen ratio of 1:

1 to 1;

5.

66. The method of claim 38, wherein the borated polyisobutylene succinimide is present at 0.1 to 2 wt %, or 0.2 wt % to 1 wt %.

67. The method of claim 38, wherein the polyisobutylene succinimide is present in an amount greater than the borated polyisobutylene succinimide

68. The method of claim 67, wherein the borated polyisobutylene succinimide contributes 5 wt % to 25 wt % of dispersant present;

and polyisobutylene succinimide contributes 75 wt % to 95 wt % of dispersant present