Lubricating oil composition

• US 10,443,012 B2
• Filed: 10/16/2015
• Issued: 10/15/2019
• Est. Priority Date: 11/21/2014
• Status: Active Grant

• Current Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Original Assignee: The Lubrizol Corporation (Berkshire Hathaway Incorporated)
• Inventors: Zhang, Yanshi, McGuiness, Mark J.
• Primary Examiner(s): Singh, Prem C
• Assistant Examiner(s): Campanell, Francis C
• Application Number:
  US15/523,718
• Publication Number:
  US 20170335227A1
• Time in Patent Office: 1,460 Days
• Field of Search: 508186
• CPC Class Codes: C10M 139/00 Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing atoms of elements not provided for in groups C10M127/00 - C10M137/00
• CPC Class Codes: C10M 2203/1025 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: C10M 2223/045 Metal containing thio derivatives
• CPC Class Codes: C10M 2227/061 Esters derived from boron
• CPC Class Codes: C10M 2227/062 Cyclic esters
• CPC Class Codes: C10N 2010/04 Groups 2 or 12
• CPC Class Codes: C10N 2030/12 Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• CPC Class Codes: C10N 2030/42 Phosphor free or low phosphor content compositions
• CPC Class Codes: C10N 2030/44 Boron free or low content boron compositions
• CPC Class Codes: C10N 2040/02 Bearings
• CPC Class Codes: C10N 2040/25 Internal-combustion engines

Abstract

The invention provides a lubricant composition containing an oil of lubricating viscosity and a boron-containing compound, wherein the boron containing compound comprises a borate ester comprising at least one alkyl group having a branch at the ? position or higher. The invention further relates to a method of lubricating an internal combustion engine with the lubricant composition.

Claims

1. A lubricant composition comprising:

an oil of lubricating viscosity; and

a borate ester being the reaction product of boric acid and 2-propyl heptanol, said borate ester being present in an amount to provide about 100 to about 200 parts per million by weight of boron to the lubricant composition.

2. The lubricant of claim 1, further comprising an overbased detergent.

3. The lubricant of claim 1, further comprising at least one amine-functionalized dispersant having a total base number of 1 to 110 mg KOH/g.

4. The lubricant of claim 1, further comprising at least one amine-functionalized dispersant in an amount sufficient to deliver a TBN of 0.5 to 8 mg KOH/g to the lubricant.

5. A method for lubricating a mechanical device, comprising supplying thereto the lubricant of claim 1.

6. The method of claim 5, wherein the mechanical device is an internal combustion engine.

7. A method of reducing corrosion in an internal combustion engine comprising:

providing a lubricating composition comprising

(a) an oil of lubricating viscosity, and

(b) a borate ester being the reaction product of boric acid and 2-propyl heptanol, said borate ester being present in an amount to provide about 100 to about 200 parts per million by weight of boron to the lubricant composition; and

supplying said lubricating composition to said internal combustion engine.