Silane-Functionalized Polymer Modifiers for Elastomer Durability
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Solution Overview
Problem
Conventional tire compounds face challenges in maintaining wet traction, treadwear, and rolling resistance due to the migration of low molecular weight additives and immiscible resins, which affect the durability and performance of tire components.
Innovation Solution
The use of a silane-functionalized hydrocarbon polymer modifier (Si-HPM) anchored to fillers or polymers in elastomeric compositions, which improves long-term performance by enhancing filler dispersion and preventing additive migration, thereby maintaining or improving wet traction, treadwear, and rolling resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional low molecular weight additives and immiscible resins are used in elastomeric compositions, then processing ease and initial performance are improved, but long-term durability deteriorates due to additive migration
Solution Approach 1:
The patent uses silane-functionalized hydrocarbon polymer modifiers as composite materials that combine the processing benefits of conventional additives with the durability of anchored structures. The silane-functionalized polymers act as intermediate compounds that bridge the gap between immiscible resins and the elastomeric matrix, providing both ease of processing and long-term stability without migration.
Solution Approach 2:
The silane-functionalized hydrocarbon polymer modifiers serve as intermediary substances between the immiscible resins and the elastomeric matrix. These modifiers have functional groups that anchor them to the matrix while their hydrocarbon portions interact with the resins, preventing phase separation and additive migration while maintaining processing ease.
2Reliability
If immiscible resins are used to broaden glass transition temperature range, then wet traction is improved, but compound homogeneity deteriorates
Solution Approach 1:
The silane-functionalized hydrocarbon polymer modifiers act as intermediaries that compatibilize the immiscible resins with the elastomeric matrix. The functional groups anchor to the matrix while the hydrocarbon portions interact with the resins, creating a homogeneous compound structure that maintains the broad glass transition temperature range needed for wet traction across varying temperatures.
Solution Approach 2:
The patent creates a composite system where silane-functionalized polymers form a bridge between immiscible resins and the elastomeric matrix. This composite structure maintains phase separation benefits for wet traction while preventing macroscopic heterogeneity through molecular-level anchoring and interaction.
3Ease of operation
If aromatic oils are used as processing aids in tire compounds, then processability of uncured composition is improved, but environmental compatibility and performance consistency deteriorate
Solution Approach 1:
The patent changes the chemical parameters of processing aids by using silane-functionalized hydrocarbon polymer modifiers instead of conventional aromatic oils. These modifiers have controlled molecular weights, functional group densities, and hydrocarbon chain structures that provide consistent processing improvement while eliminating the environmental and performance consistency issues associated with aromatic oils through standardized composition.
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
The Si-HPM improves the durability and performance of tire compounds by preventing additive migration and enhancing filler dispersion, leading to improved wet traction, treadwear, and rolling resistance, ensuring consistent tire performance over time.
Implementation Method 1
the at least one functional group comprises a silane structure to provide at least one silane-functionalized hydrocarbon polymer modifier ("Si-HPM"). The Si-HPM is anchored or anchorable via the functional group(s) to another component in the elastomeric composition
Data Source
AI summary
An elastomeric composition and method incorporating a hydrocarbon polymer modifier with improved permanence. The composition comprises elastomer, filler and silane-functionalized hydrocarbon polymer modifier (Si-HPM) adapted to couple the Si-HPM to the elastomer, filler or both, wherein the Si-HPM comprises an interpolymer of monomers chosen from piperylenes, cyclic pentadienes, aromatics, limonenes, pinenes, amylenes, and combinations thereof. The method comprises melt processing a mixture to form the elastomeric composition in the shape of an article, wherein the mixture comprises elastomer, Si-HPM, silica, bifunctional organosilane crosslinking agent; and curing the elastomeric composition to form the article. Also disclosed are a silylated hydrocarbon polymer modifier coupled with a bifunctional organosilane crosslinking agent, and a silica-coupled hydrocarbon polymer modifier coupled to the silica via the bifunctional organosilane crosslinking agent.