Nitrogen-functionalized olefin polymers for driveline lubricants

Patent metadata

Field	Value
Publication number	US-11180711-B2
Application number	US-201816638632-A
Country	US
Kind code	B2
Filing date	Aug 16, 2018
Priority date	Aug 17, 2017
Publication date	Nov 23, 2021
Grant date	Nov 23, 2021

Abstract

A lubricant composition of an oil of lubricating viscosity, a grafted copolymer viscosity modifier that is an ashless condensation reaction product of an olefin polymer, having a number average molecular weight of about 1000 to about 10,000, comprising carboxylic acid or equivalent functionality grafted onto the polymer backbone, with a monoamine or a polyamine often having a single primary amino group, which exhibits good dispersancy and viscometric performance in a driveline device.

First claim

What is claimed is:

1. A lubricant composition for a driveline system comprising:
(a) an oil of lubricating viscosity having a kinematic viscosity at 100° C. of about 2 to about 10 cSt;
(b) 3 to 50 wt % of the composition of at least one viscosity modifier comprising a grafted copolymer that is an oil soluble ashless condensation reaction product of an olefin polymer, having a number average molecular weight (“Mn”) as measured by Gel Permeation Chromatography (“GPC”) with a polystyrene standard of about 1000 to about 10,000, comprising carboxylic acid functionality or a reactive equivalent thereof grafted onto the polymer backbone, with an amine that is substantially free of aromatic amine, provided that if the olefin polymer is an ethylene/propylene copolymer, then said amine is one of an aliphatic amine, or a heterocyclic amine;
(c) at least one oil soluble phosphorus containing antiwear agent
wherein the lubricant is for an automotive gear and has a sulfur content of about 100 to about 40,000 ppm and a phosphorus content of about 200 ppm to about 3000 ppm.

2. The lubricant composition of claim 1 wherein the grafted copolymer is present in an amount to provide the lubricating composition a desired kinematic viscosity according to SAE J306 of from 70W to 250.

3. The lubricant composition of claim 1 wherein the grafted copolymer comprises an ethylene/propylene copolymer backbone with grafted succinic anhydride functionality.

4. The lubricant composition of claim 1 wherein the amine component comprises a primary amine.

5. The lubricant composition of claim 1 , wherein the amine component is an aliphatic amine, heterocyclic amine or mixtures thereof.

6. The lubricant composition of claim 5 , wherein the amine is a non-aromatic amine selected from N,N-Dimethylethylamine; 3-(Dimethylamino)-1-propylamine; 3-(Diethylamino)propylamine; 3-(Dibutylamino)propylamine; O-(2-Aminopropyl)-O′-(2-methoxyethyl)polypropylene glycol; N,N-Dimethyldipropylenetriamine; 3-Morpholinopropylamine; Aminoethylethyleneurea; or mixtures thereof.

7. The lubricant of any of claim 5 wherein the amine component comprises 3-Morpholinopropylamine.

8. The lubricant of claim 1 wherein the grafted olefin polymer of (b) has a nitrogen content of about 0.1 to 10 percent by weight.

9. The lubricant of claim 1 wherein the lubricant is for a manual or automated manual transmission and has a sulfur content of about 300 to about 5000 ppm.

10. The lubricant of claim 1 through wherein the lubricant is for an axle fluid and has a sulfur content of about 5000 to about 40,000 ppm.

11. The lubricant composition of claim 1 , where the antiwear agent comprises (thio)phosphates, phosphates, (thio)phosphites, phosphites, pyrophosphates, polyphosphites, or mixtures thereof.

12. The lubricant composition of claim 1 , wherein the composition further comprises an extreme pressure agent at about 0.05 to about 10 weight percent of the composition.

13. The lubricant of claim 1 wherein the lubricant is for an automotive gear and has a phosphorus content of about 200 ppm to about 3000 ppm of the composition.

14. The lubricant of claim 13 wherein the lubricant is for a manual or automated manual transmission and has a phosphorus content of about 400 ppm to about 1500 ppm of the composition.

15. The lubricant of claim 14 wherein the lubricant is for an axle fluid and has a phosphorus content of about 400 ppm to about 3000 ppm of the composition.

16. A method for lubricating a driveline system by supplying thereto the lubricant composition of claim 1 .

17. The method of claim 16 , wherein the driveline system is selected from at least one of a gear, an axle, a drive shaft, gearbox, a manual or automated manual transmission, or a differential.

Assignees

• Lubrizol Corp

Inventors

• Sivakova Sona
• Nickerson David M
• O'Hora Paul Simon
• Barton William R S

Classifications

• C10M2215/04

  having amino groups bound to acyclic or cycloaliphatic carbon atoms · CPC title

• C10M2205/024

  Propene · CPC title

• C10M149/18

  Polyamides · CPC title

• C10M2203/1025

  used as base material · CPC title

• C10M2209/06

  containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid · CPC title