Ashless or reduced ash quaternary detergents

Patent metadata

Field	Value
Publication number	US-9469824-B2
Application number	US-201414277079-A
Country	US
Kind code	B2
Filing date	May 14, 2014
Priority date	Mar 3, 2009
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.

First claim

What is claimed is:

1. A lubricant composition comprising an oil of lubricating viscosity and an oil-soluble ionic detergent, which detergent comprises
(a) a quaternary ammonium cation and
(b) an organic anion having at least one aliphatic hydrocarbyl group of sufficient length to impart oil solubility to the detergent;
said oil-soluble ionic detergent having a total base number (TBN) to total acid number (TAN) ratio of at least about 2:1;
wherein said oil-soluble ionic detergent exhibits a TBN of at least about 10 arising from a non-metallic base, and wherein said oil-soluble ionic detergent comprises a stoichiometric excess of quaternary ammonium cations of (a) over organic anions of (b) such that said cations and anions are present in an equivalent ratio (a):(b) of at least about 2:1;
wherein the cation comprises a pyridinium ion or an imidazolium ion.

2. The lubricant composition of claim 1 wherein the oil-soluble ionic detergent comprises a sulfonate, carboxylate, salicylate, or phenate anion.

3. The lubricant composition of claim 1 wherein the oil-soluble ionic detergent has a TBN of about 50 to about 300 and a TAN of less than about 10.

4. The lubricant composition of claim 1 wherein the oil-soluble detergent has a TBN:TAN ratio of about 7:1 to about 150:1.

5. The lubricant composition of claim 1 wherein the oil-soluble ionic detergent does not contribute metal ions to the lubricant composition.

6. The lubricant composition of claim 1 wherein the amount of the oil-soluble ionic detergent is about 0.1 to about 10 percent by weight.

7. The lubricant composition of claim 1 further comprising at least one dispersant, metal-containing detergent other than said oil-soluble ionic detergent, extreme pressure agent, anti-wear agent, antioxidant, friction modifier, viscosity modifier, metal salt of a phosphorus acid, corrosion inhibitor, antirust agent, antifoam agent, or mixtures thereof.

8. The lubricant composition of claim 1 further comprising a metal-containing detergent other than said oil-soluble ionic detergent.

9. The lubricant composition of claim 1 wherein the oil-soluble ionic detergent is substantially metal-free and contributes at least about 0.2 TBN to the lubricant.

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

Assignees

• Lubrizol Corp

Inventors

• Delbridge Ewan E
• Carrick Virginia A
• Pudelski John K
• Giesleman Matthew D
• Friend Christopher L
• Mosier Patrick E
• Rogers Michele M
• Tierney Mark T

Classifications

• C10N2030/45

  Ash-less or low ash content · CPC title

• C10N2020/077

  Ionic Liquids · CPC title

• C10N2030/52

  Base number [TBN] · CPC title

• C10N2030/42

  Phosphor free or low phosphor content compositions · CPC title

• C10N2030/43

  Sulfur free or low sulfur content compositions · CPC title