Power transmitting fluids with improved materials compatibility

Patent metadata

Field	Value
Publication number	US-9732301-B2
Application number	US-201414533195-A
Country	US
Kind code	B2
Filing date	Nov 5, 2014
Priority date	Nov 5, 2014
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A power transmitting fluid comprises a major amount of a lubricating oil and a minor amount of an additive composition. The additive composition comprises:
(a) a friction modifier of the formula:

(b) an oil-soluble phosphorus compound; and,
(c) an ashless dispersant;

wherein R 1 and R 2 may be the same or different and represent linear or branched, saturated or unsaturated hydrocarbyl groups having from 8 to 20 carbon atoms. Z represents a polyoxyalkylene segment or a polyalkoxylated alkyl amine segment. The friction modifiers provide the fluid with improved fluoroelastomer seal compatibility and enhanced copper corrosion compatibility.

First claim

What is claimed is:

1. A power transmitting fluid comprising a major amount of a natural lubricating oil and a minor amount of an additive composition, the additive composition comprising:
(a) a friction modifier of the formula:

(b) an oil-soluble phosphorus compound: and
(c) an ashless dispersant:
where R 1 and R 2 may be the same or different and represent linear or branched, saturated or unsaturated hydrocarbyl groups having from 8 to 20 carbon atoms;
wherein Q represents an alkylene group having 1 to 4 carbon atoms; and
wherein a is an integer from 5 to 15.

2. A fluid according to claim 1 wherein Q or each Q is an ethylene group.

3. A fluid according to claim 2 wherein R 9 is an alkyl group.

4. A fluid according to claim 1 wherein R 1 and R 2 are the same.

5. A fluid according to claim 1 wherein R 1 and R 2 are linear or branched, saturated or unsaturated alkyl groups having from 4 to 20 carbon atoms.

6. A fluid according to claim 1 wherein the fluid further comprises one or more corrosion inhibitors.

7. A fluid according to claim 1 wherein the fluid further comprises one or more metal-containing detergents.

8. A fluid according to claim 1 , which is an automatic transmission fluid.

9. A method of formulating a power transmitting fluid with improved fluoroelastomer seal compatibility, the method comprising combining a major amount of a natural lubricating oil with a minor amount of an additive composition as defined in claim 1 .

10. A method of formulating a power transmitting fluid with improved copper corrosion compatibility, the method comprising combining a major amount of a lubricating oil with a minor amount of an additive composition as defined in claim 1 .

Assignees

• Infineum Int Ltd

Inventors

• Watts Raymond F
• Gorda Keith R

Classifications

• C10N2030/14

  Metal deactivation · CPC title

• C10N2030/36

  Seal compatibility, e.g. with rubber · CPC title

• C10N2040/042

  for automatic transmissions · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title