Functionalized Olefin Polymers for Low-Viscosity Engine Oil Dispersancy
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Solution Overview
Problem
There is a need for engine oil compositions with low viscosity grades that maintain cleanliness, reduce sludge, provide good soot handling, and offer wear protection while achieving fuel economy benefits, all while minimizing sulphated ash and phosphorus levels and ensuring seal compatibility.
Innovation Solution
The use of functionalized polymers with a partially or fully saturated olefin homopolymer or copolymer backbone, which are amide, imide, and/or ester functionalized, to create lubricating oil compositions that can operate effectively without traditional dispersants like PIBSA-PAM, thereby improving formulating windows and base stock flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dispersants (PIBSA-PAM) are used in lubricant formulations, then dispersancy and soot handling are improved, but viscosity grades increase and fuel economy benefits are reduced
Solution Approach 1:
The patent applies parameter changes by modifying the molecular weight and chemical structure of dispersant molecules. Specifically, it uses functionalized polymers with controlled molecular weights (Mn 10,000-50,000) and specific functional group densities to achieve effective dispersancy at lower concentrations, thereby reducing overall lubricant viscosity and improving fuel economy while maintaining soot handling capabilities
Solution Approach 2:
The patent employs composite material principles by creating multifunctional dispersant molecules that combine polymer backbones (ethylene-propylene copolymer) with multiple functional groups (succinimide, amine, hydroxyl). This composite structure allows a single additive to perform multiple functions: dispersing soot particles, providing wear protection, and maintaining viscosity stability, thereby reducing the need for additional additives that would increase overall viscosity
2Use of energy by moving object
If low viscosity grades are used to improve fuel economy, then fuel efficiency is improved, but cleanliness and sludge reduction capabilities deteriorate
Solution Approach 1:
The patent merges multiple protective functions into a single lubricant formulation system. The functionalized polymer dispersant is combined with viscosity index improvers and other additives in an integrated package that works synergistically to maintain engine cleanliness, provide wear protection, and control sludge formation, all while keeping the base oil viscosity low for fuel economy benefits
Solution Approach 2:
The patent changes the chemical parameters of the dispersant molecules by introducing multiple functional groups (succinimide, amine, hydroxyl) on the polymer backbone. This increases the dispersant's effectiveness per unit mass, allowing low viscosity grades to maintain adequate dispersancy and cleanliness performance through optimized molecular design rather than relying on higher additive concentrations
3Use of energy by moving object
If traditional dispersants are reduced or eliminated, then fuel economy and viscosity are improved, but dispersancy and soot handling capabilities worsen
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight (Mn 10,000-50,000) and functional group density of the dispersant molecules. This optimization ensures sufficient dispersancy and soot handling at reduced concentrations, achieving fuel economy benefits while maintaining protective performance
Solution Approach 2:
The patent uses composite material principles by designing dispersants with complex molecular structures combining polymer backbones and multiple functional groups, creating molecules with enhanced dispersancy per unit mass that can effectively handle soot at lower concentrations
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
This approach allows for the reduction or elimination of traditional dispersants, achieving improved viscometric properties and dispersancy in lubricating oils, which enhances engine cleanliness, fuel efficiency, and wear protection while maintaining low levels of harmful additives.
Implementation Method 1
Dispersants help keep these byproducts suspended or in solution, thus diminishing their deposition on metal surfaces
Implementation Method 2
VIIs may be used to reduce the extent to which the viscosity of lubricants changes with temperature
Implementation Method 3
maintaining a good film thickness for durability and wear protection
Data Source
AI summary
This invention relates to a lubricating oil composition comprising: at least 50 mass% or more of one or more base oils; detergent; and 0.01 to 20 mass % of a functionalized polymer comprising a partially or fully saturated olefin homopolymer or copolymer backbone and at least one functional group, having: i) an Mn of 10,000 g/mol or more (GPC-PS) of the polymer prior to functionalization, ii) where in the functional group is derived from an acylating agent and a compound containing amino and/or hydroxyl groups, and iii) optionally, wherein the homopolymer or copolymer backbone is derived from monomers selected from the group consisting of C2 to C30 (such as linear) alpha olefins and C4 to C20 conjugated dienes; where PIBSA-PAM having an Mn of 1,600 g/mol or more (GPC-PS) is absent or substantially absent from the lubricating oil composition, or, if present, is present in an amount such that the weight ratio of the functionalized polymer (B) to the high molecular weight PIBSA-PAM is at least 0.25:1.