Lubricating Oil Composition Having Improved Air Release

Patent metadata

Field	Value
Publication number	US-2019062666-A1
Application number	US-201716081160-A
Country	US
Kind code	A1
Filing date	Feb 20, 2017
Priority date	Mar 3, 2016
Publication date	Feb 28, 2019
Grant date	—

Abstract

The invention provides a lubricating oil composition comprising a ethylene/α-olefin copolymer and, optionally, and additive comprising an amine salt of a hydrocarbyl thiophosphoric acid ester. The invention also provides a method of improving air release of a lubricating oil composition by mixing an ethylene/α-olefin copolymer with an oil of lubricating viscosity.

First claim

What is claimed is:

1 . A lubricating oil composition comprising:
(a) an oil of lubricating viscosity; (b) an ethylene/α-olefin copolymer; and (c) an additive comprising an amine salt of a hydrocarbyl thiophosphoric acid ester.

2 . The lubricating oil composition of claim 1 , wherein the additive comprising an amine salt of a hydrocarbyl thiophosphoric acid ester is obtained by reacting a phosphorous sulfide with one or more alcohols having about 3 to about 13 carbon atoms to form a thiophosphoric acid ester, further reacting the thiophosphoric acid ester with an alkylene oxide to form a hydroxyl-substituted ester of thiophosphoric acid, and further reacting said hydroxyl-substituted ester of thiophosphoric acid with a phosphorous oxide to form a an acidic phosphoric acid intermediate, and salting said acidic phosphoric acid intermediate with one or more amines wherein said amines contain one or more hydrocarbyl groups having from 2 to 30 carbon atoms.

3 . The lubricating oil composition of claim 1 , wherein the ethylene/α-olefin copolymer comprises ethylene monomer units and one or more α-olefin monomer units other than ethylene monomer, wherein the amount of ethylene monomer units is greater than 5 weight percent, wherein the α-olefin monomer units contain 3 to about 20, or 3 to about 6, or 3 to 4, or 3 carbon atoms or mixtures thereof.

4 . The lubricating oil composition of claim 1 , wherein the α-olefin monomer units of the ethylene/α-olefin copolymer comprise propylene units and monomer units containing 4 to about 20 carbon atoms.

5 . The lubricating oil composition of claim 1 , wherein the ethylene/α-olefin copolymer has a kinematic viscosity at 100° C. of at least about 35 mm 2 /s or at least 500 mm 2 /s.

6 . The lubricating oil composition of claim 1 , wherein the lubricating oil composition comprises about 11% to about 17% by weight of the ethylene/α-olefin copolymer.

7 . The lubricating oil composition of claim 1 , wherein the lubricating oil composition comprises about 0.04% to about 0.15% by weight of the additive an amine salt of a hydrocarbyl thiophosphoric acid ester.

8 . The lubricating oil composition of claim 1 , further comprising: an industrial additive package.

9 . A method of lubricating an industrial gear comprising supplying to the industrial gear the lubricating oil composition of claim 1 .

10 . A method of improving the air release of a lubricating oil composition, comprising:
(i) providing (a) a base oil of lubricating viscosity, (b) an ethylene/α-olefin copolymer, and (c) an additive comprising an amine salt of a hydrocarbyl thiophosphoric acid ester; (ii) mixing the base oil of lubricating viscosity, the ethylene/α-olefin copolymer, and the additive to obtain a functional fluid.

11 . The method of claim 10 , wherein the additive comprising an amine salt of a hydrocarbyl thiophosphoric acid ester is obtained by reacting a phosphorous sulfide with one or more alcohols having about 3 to about 13 carbon atoms to form a thiophosphoric acid ester, further reacting the thiophosphoric acid ester with an alkylene oxide to form a hydroxyl-substituted ester of thiophosphoric acid, and further reacting said hydroxyl-substituted ester of thiophosphoric acid with a phosphorous oxide to form a an acidic phosphoric acid intermediate, and salting said acidic phosphoric acid intermediate with one or more amines wherein said amines contain one or more hydrocarbyl groups having from 2 to 30 carbon atoms.

12 . The method of claim 10 , wherein the ethylene/α-olefin copolymer comprises ethylene monomer units and one or more α-olefin monomer units other than ethylene monomer, wherein the amount of ethylene monomer units is greater than 5 weight percent, wherein the α-olefin monomer units contain 3 to about 20, or 3 to about 6, or 3 to 4, or 3 carbon atoms or mixtures thereof.

13 . The method of claim 10 , wherein the α-olefin monomer units of the ethylene/α-olefin copolymer comprise propylene units and monomer units containing 4 to about 20 carbon atoms.

14 . The method of claim 10 , wherein the ethylene/α-olefin copolymer has a kinematic viscosity at 100° C. of at least about 35 mm 2 /s or at least 500 mm 2 /s.

15 . The method of claim 10 , wherein the functional fluid contains about 11% to about 17% by weight of the ethylene/α-olefin copolymer.

16 . The method of claim 10 , wherein the lubricating oil composition comprises about 0.04% to about 0.15% by weight of the additive an amine salt of a hydrocarbyl thiophosphoric acid ester.

17 . (canceled)

18 . (canceled)

Assignees

• Lubrizol Corp

Inventors

• Hobson David M
• Smith Timothy R
• Price David

Classifications

• C10M2205/022

  Ethene · CPC title

• C10M2223/047

  Thioderivatives not containing metallic elements · CPC title

• C10M2205/024

  Propene · CPC title

• C10M2219/022

  of hydrocarbons, e.g. olefines · CPC title

• C10M2203/1085

  used as base material · CPC title