Low viscosity marine cylinder lubricating oil compositions

• US 8,702,968 B2
• Filed: 04/04/2012
• Issued: 04/22/2014
• Est. Priority Date: 04/05/2011
• Status: Expired due to Fees

• Current Assignee: Chevron Oronite Technology B.V.Chevron Oronite Technology B.V. (Chevron Corp.)
• Original Assignee: Chevron Oronite Technology B.V.Chevron Oronite Technology B.V. (Chevron Corp.)
• Inventors: Boons, Cornelis Hendrikus Maria
• Primary Examiner(s): VASISTH, VISHAL V
• Application Number:
  US13/438,978
• Publication Number:
  US 20120322701A1
• Time in Patent Office: 748 Days
• Field of Search: 508/110, 208/19
• US Class Current: 208/19
• CPC Class Codes: C10M 109/00 Lubricating compositions characterised by the base-material being a compound of unknown or incompletely defined constitution C10M101/00 takes precedence
• CPC Class Codes: C10M 171/02 Specified values of viscosity or viscosity index
• CPC Class Codes: C10M 2203/1025 used as base material
• CPC Class Codes: C10M 2203/108 Residual fractions, e.g. bright stocks
• CPC Class Codes: C10M 2203/1085 used as base material
• CPC Class Codes: C10M 2215/28 Amides; Imides
• CPC Class Codes: C10M 2219/046 Overbasedsulfonic acid salts
• CPC Class Codes: C10M 2219/089 Overbased salts
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2020/02 Viscosity; Viscosity index
• CPC Class Codes: C10N 2030/02 Pour-point; Viscosity index
• 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 2030/52 Base number [TBN]
• CPC Class Codes: C10N 2040/252 Diesel engines

Abstract

Disclosed herein are marine cylinder lubricants which comprise a major amount of basestock selected from the group consisting of a Group II basestock, a Group III basestock and mixtures thereof, wherein the marine cylinder lubricant has a kinematic viscosity at 100° C. of from 13 to about 16.2 cSt; and contains less than about 10 wt. % bright stock. Also disclosed are marine cylinder lubricants which comprise a major amount of basestock selected from the group consisting of a Group II basestock, a Group III basestock and mixtures thereof, wherein the marine cylinder lubricant has a kinematic viscosity at 100° C. of between about 13 and about 16.2 cSt; and a total base number of 5 to about 70, and further wherein the marine cylinder lubricant contains less than about 10 wt. % bright stock.

Claims

1. A marine cylinder lubricant comprising a major amount of a Group II basestock, wherein the marine cylinder lubricant has a kinematic viscosity at 100°

C. of from 13 to about 16.2 cSt and a TBN of from about 40 to about 70; and

further wherein the marine cylinder lubricant is substantially free of a bright stock and substantially free of a Group I basestock.

2. The marine cylinder lubricant of claim 1, having a kinematic viscosity at 100°

C. of from about 13.25 to about 16.2 cSt.

3. The marine cylinder lubricant of claim 1, having a kinematic viscosity at 100°

C. of from about 13.50 to about 16.2 cSt at 100°

C.

4. The marine cylinder lubricant of claim 1, further comprising a marine cylinder engine lubricating oil composition additive selected from the group consisting of an antioxidant, ashless dispersant, detergent, anti-wear agents, rust inhibitor, dehazing agent, demulsifying agent, metal deactivating agent, friction modifier, pour point depressant, antifoaming agent, co-solvent, package compatibiliser, corrosion-inhibitor, dyes, extreme pressure agent and mixtures thereof.

5. A method for maintaining wear performance of a marine cylinder lubricant used in a cylinder of a 2-stroke crosshead marine diesel engine comprising lubricating the cylinder with a marine cylinder lubricant comprising a major amount of a Group II basestock, wherein the marine cylinder lubricant has a kinematic viscosity at 100°

C. of from 13 to about 16.2 cSt and a TBN of from about 40 to about 70; and

further wherein said marine cylinder lubricant is substantially free of a bright stock and substantially free of a Group I basestock.

6. The method of claim 5, wherein the marine cylinder lubricant further comprises a marine cylinder engine lubricating oil composition additive selected from the group consisting of an antioxidant, ashless dispersant, detergent, anti-wear agent, rust inhibitor, dehazing agent, demulsifying agent, metal deactivating agent, friction modifier, pour point depressant, antifoaming agent, co-solvent, package compatibiliser, corrosion-inhibitor, dye, extreme pressure agent and mixtures thereof.