Zinc-free lubricating composition

Patent metadata

Field	Value
Publication number	US-10738263-B2
Application number	US-201615774641-A
Country	US
Kind code	B2
Filing date	Nov 10, 2016
Priority date	Nov 11, 2015
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

The invention is directed to a zinc-free lubricating composition for an internal combustion engine containing a phosphorus anti-wear agent, an ashless antioxidant, and an oxyalkylated phenol compound. The lubricating composition provides wear protection, deposit control, and improved acid control with reduced levels of metal-containing additives.

First claim

What is claimed:

1. A zinc-free lubricating composition comprising:
(a) an oil of lubricating viscosity;
(b) a zinc-free phosphorus-containing antiwear agent;
(c) at least one oxyalkylated hydrocarbyl phenol substituted with at least one aliphatic hydrocarbyl group of 1 to 250 carbon atoms; and
(d) a sulfurized phenol or sulfur-substituted phenol ashless antioxidant.

2. The lubricating composition of claim 1 , wherein the zinc-free phosphorus-containing antiwear agent is selected from phosphites, phosphonates, organic phosphate esters, amine or ammonium phosphate salts, and combinations thereof.

3. The lubricating composition of claim 1 , wherein the oxyalkylated hydrocarbyl phenol is represented by the formula:

wherein each R 2 is independently hydrogen or a hydrocarbyl group of 1 to 6 carbon atoms;
R 3 is hydrogen, a hydrocarbyl group of 1 to 24 carbon atoms, or an acyl group represented by —C(═O)R 5 ,
R 5 is a hydrocarbyl group of 1 to 24 carbon atoms;
each R 4 is independently a hydrocarbyl group of 1 to 250 carbon atoms (typically wherein at least one R 4 contains 20 to 220, or 30 to 150, 35 to 140, or 40 to 96 carbon atoms);
n=1 to 20; and m=1 to 3.

4. The lubricating composition of claim 1 , further comprising further comprises at least one other additive selected from an ashless dispersant, a phosphorus-free ashless anti-wear additive, a friction modifier, a polymeric viscosity modifier, a corrosion inhibitor, and a metal-containing detergent.

5. The lubricating composition of claim 1 , wherein the zinc-free phosphorus antiwear agent is present in an amount to deliver 0.01 weight % to 0.15 weight % phosphorus to the lubricating composition.

6. The lubricating composition of claim 1 , wherein the ashless antioxidant is present in an amount 0.1 weight % to 10 weight % in the lubricating composition.

7. The lubricating composition of claim 1 , further comprising a functionalized polymer compound in an amount 0.2 to 8 percent by weight of the composition, wherein the polymer has a number averaged molecular weight of at least 5000, and the polymer is selected from polyolefins, poly(meth)acrylates, styrene-diene copolymers, copolymers of maleic anhydride and one or more of alpha-olefins and vinyl-aromatic monomers, and combinations thereof.

8. The lubricating composition of claim 1 , further comprising a polyalkenyl succinimide dispersant in an amount from 0.1 to 2.0 weight % of the composition.

9. The lubricating composition of claim 1 , wherein the lubricant composition comprises less than 35 weight % of Group IV base oil.

10. A method of lubricating an internal combustion engine comprising lubricating the engine with a lubricant composition comprising (a) an oil of lubricating viscosity, (b) a zinc-free phosphorus-containing antiwear agent, (c) at least one oxyalkylated hydrocarbyl phenol that is substituted with at least one aliphatic hydrocarbyl group of 1 to 250 carbon atoms, and (d) a sulfurized phenol or sulfur-substituted phenol ashless antioxidant.

11. The method of claim 9 , wherein the engine is fueled with a liquid hydrocarbon fuel, a liquid nonhydrocarbon fuel, or mixtures thereof.

12. The method of claim 9 , wherein the engine is fueled by natural gas, liquefied petroleum gas (LPG), compressed natural gas (CNG), or mixtures thereof.

Assignees

• Lubrizol Corp

Inventors

• Sutton Michael R
• Vincent Paul R

Classifications

• C10M141/10 Primary

  at least one of them being an organic phosphorus-containing compound · CPC title

• C10M2215/086

  Imides [having hydrocarbon substituents containing less than thirty carbon atoms] · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2215/064

  Di- and triaryl amines · CPC title

• C10M2215/28

  Amides; Imides · CPC title