Friction modifier composition for lubricants

Patent metadata

Field	Value
Publication number	US-2016201004-A1
Application number	US-201615073922-A
Country	US
Kind code	A1
Filing date	Mar 18, 2016
Priority date	Mar 13, 2012
Publication date	Jul 14, 2016
Grant date	—

Abstract

Combining a metal based friction modifier, such as a molybdenum dialkyldithiocarbamate, and certain esters of hydroxy carboxylic acids, such as short chain alkyl esters of citric or tartaric acid, e.g., tributyl citrate, has a synergistic effect on lowering the friction coefficient of lubricating oils allowing one to reduce the amount of metal based friction modifier needed to adequately formulate a lubricant with low friction characteristics.

First claim

What is claimed:

1 . A lubricant composition comprising:
A) 70 wt % or more of a automotive motor lubricating oil, and B) from about 1.5 to about 4.5 wt %, based on the weight of the lubricant composition, of a mixture of
i) from about 0.75 to about 1.5 wt % a friction modifier selected from the group of molybdenum dialkyldithiocarbamates, and
ii) from 0.75% to about 3% a hydroxy carboxylic ester selected from the group consisting of triethyl citrate, tripropyl citrate and tributyl citrate;
wherein i) and ii) are present in a weight ratio of metal based friction modifier i) to hydroxy carboxylic ester ii) of about 1:1 to about 1:4 based on the total weight of metal based friction modifier i) and hydroxy carboxylic ester ii).

2 . The lubricant composition according to claim 1 further comprising one or more additional lubricant additive selected from the group consisting of dispersants, detergents, corrosion/rust inhibitors, antioxidants, anti-wear agents, anti-foamants, friction modifiers, seal swell agents, demulsifiers, V.I. improvers and pour point depressants.

3 . The lubricant composition according to claim 1 wherein the automotive motor lubricating oil is a natural petroleum based automotive motor lubricating oil.

4 . The lubricant composition according to claim 3 further comprising one or more additional lubricant additive selected from the group consisting of dispersants, detergents, corrosion/rust inhibitors, antioxidants, anti-wear agents, anti-foamants, friction modifiers, seal swell agents, demulsifiers, V.I. improvers and pour point depressants.

5 . The lubricant composition according to claim 1 wherein i) and ii) are present in a weight ratio of metal based friction modifier i) to hydroxy carboxylic ester ii) of about 1:1 to about 1:3 based on the total weight of metal based friction modifier i) and hydroxy carboxylic ester ii).

6 . The lubricant composition according to claim 3 wherein i) and ii) are present in a weight ratio of metal based friction modifier i) to hydroxy carboxylic ester ii) of about 1:1 to about 1:3 based on the total weight of metal based friction modifier i) and hydroxy carboxylic ester ii).

7 . The lubricant composition according to claim 4 wherein i) and ii) are present in a weight ratio of metal based friction modifier i) to hydroxy carboxylic ester ii) of about 1:1 to about 1:3 based on the total weight of metal based friction modifier i) and hydroxy carboxylic ester ii).

8 . The lubricant composition according to claim 1 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

9 . The lubricant composition according to claim 3 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

10 . The lubricant composition according to claim 4 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

11 . The lubricant composition according to claim 5 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

12 . The lubricant composition according to claim 6 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

13 . The lubricant composition according to claim 7 wherein the natural petroleum based automotive motor lubricating oil is present from about 95 to about 99 wt %.

Assignees

• Chemtura Corp

Inventors

• Deblase Frank J
• Madabusi Venkatramanan K
• Ferrarotti Susan
• Corbo Faith
• Migdal Cyril A
• Mulqueen Gerard

Classifications

• C10N2030/12

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

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2020/02

  Viscosity; Viscosity index · CPC title

• C10M2207/289

  containing free hydroxy groups · CPC title

• C10M169/04 Primary

  Mixtures of base-materials and additives · CPC title