Alkenyl Ester Friction Modifiers for Sustained Engine Lubricity

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Solution Overview

Problem

Friction modifiers like glycerol monooleate (GMO) in lubricants degrade due to hydrolysis and heat, leading to reduced friction reduction effectiveness and negative impact on fuel economy in internal combustion engines.

Innovation Solution

Incorporation of C10 to C14 alkenyl carboxylic acid esters of aliphatic diols or polyols as friction modifiers, which are slowly released through Johnson-Claisen rearrangement and deprotection processes, providing sustained friction reduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If GMO is used as a friction modifier in lubricants, then friction reduction is achieved, but the friction modifier degrades over time due to hydrolysis and heat, reducing its effectiveness

Engineering Contradiction:

Improvefriction reduction effectivenessVSAvoidlongevity of friction modifier

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent applies preliminary action by incorporating a precursor compound that will transform into the active friction modifier (GMO) under engine operating conditions. The precursor is stabilized during storage and transport, then activates in-situ when exposed to engine heat and moisture, ensuring the friction modifier is generated at the optimal time and location rather than degrading from the start

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes parameter changes by designing a precursor compound that undergoes chemical transformation (Johnson-Claisen rearrangement) when exposed to specific temperature and moisture conditions in the engine. This transforms the stable precursor into the active GMO friction modifier, allowing the system to adapt its chemical state based on operating conditions to maintain effectiveness

Inventive Principle:

Principle #35Parameter changes

2Reliability

If heat is applied in the engine, then friction reduction is enhanced, but heat causes degradation of the friction modifier, reducing its longevity

Engineering Contradiction:

Improvefriction reduction effectivenessVSAvoidheat-induced degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of heat into a beneficial activation mechanism. The precursor compound is designed to be stable at lower temperatures during storage but undergoes beneficial Johnson-Claisen rearrangement when exposed to engine heat, transforming into the active friction modifier. The heat that would normally cause degradation is instead utilized to trigger the activation of the friction reduction functionality

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enhances friction reduction and improves fuel economy by maintaining the effectiveness of friction modifiers over time, reducing wear in internal combustion engines.

Implementation Method 1

Methodology Applied

Scientific EffectJohnson-Claisen rearrangement: Chemical Bonding

Data Source

PatentUS12473508B2Friction modifiers with improved frictional properties and lubricating compositions containing the same

Publication Date: 2025.11.18 THE LUBRIZOL CORP

AI summary

The instant disclosure relates to lubricating compositions having improved frictional properties. The lubricating compositions include an oil of lubricating viscosity and a friction modifier that is a C10 to C14 alkenyl carboxylic acid ester of an aliphatic diol or polyol, where the double bond of the alkenyl group is within or directly attached to the longest continuous chain of the alkenyl group.