Silane-Functionalized Polymer Modifiers for Elastomer Compatibility
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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 performance and longevity of tire components.
Innovation Solution
The development of a silane-functionalized hydrocarbon polymer modifier (Si-HPM) that is anchored to fillers or polymers, improving long-term elastomeric performance by enhancing filler dispersion and preventing migration, thereby maintaining or improving treadwear and rolling resistance while enhancing wet traction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If low molecular weight additives and immiscible resins are used in conventional tire compounds, then wet traction is improved, but these additives migrate over time causing deterioration of treadwear and rolling resistance
Solution Approach 1:
The patent changes the molecular weight parameter of the resin from low to high (greater than 800 g/mol), and modifies the chemical structure by incorporating aromatic rings and rigid backbone structures. These parameter changes increase the resin's compatibility with rubber and prevent migration, thereby maintaining treadwear and rolling resistance properties over time while still providing wet traction improvement.
Solution Approach 2:
The patent creates a composite resin structure combining aromatic components (for compatibility), rigid backbone structures (for high Tg and wet traction), and high molecular weight (for migration resistance). This composite approach integrates multiple functional characteristics into a single resin system that simultaneously achieves wet traction enhancement and long-term durability.
2Strength
If high Tg resins are added to improve wet traction, then wet traction performance is enhanced, but the compound Tg increases affecting treadwear and rolling resistance
Solution Approach 1:
The patent carefully controls the Tg parameter of the resin to be greater than -50°C (preferably -40°C to 0°C), and adjusts the resin concentration to 1-20 parts per hundred rubber. This optimized parameter range allows the resin to provide wet traction enhancement through increased Tg while avoiding excessive compound Tg elevation that would harm treadwear and rolling resistance.
Solution Approach 2:
The patent creates local phase separation where the high Tg resin forms discrete domains within the rubber matrix. This local quality approach allows the resin to provide wet traction improvement at specific locations (at the tread surface) without uniformly increasing the bulk compound Tg, thereby preserving treadwear and rolling resistance properties.
3Strength
If immiscible resins are used to broaden compound Tg, then wet traction is improved, but the resins remain independent phases with separate Tg peaks
Solution Approach 1:
The patent changes the miscibility parameter by incorporating aromatic rings and polar groups into the resin structure, increasing its polarity and compatibility with rubber. This parameter change transforms the resin from immiscible (separate phases) to partially miscible or compatible, creating a more homogeneous compound while maintaining the broad Tg region needed for wet traction.
Solution Approach 2:
The patent achieves homogeneous dispersion of resin throughout the rubber matrix by matching solubility parameters and incorporating compatible functional groups. This homogeneity eliminates independent Tg peaks and creates a unified compound structure that provides consistent wet traction performance without phase separation.
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, maintaining or improving treadwear and rolling resistance, and enhancing wet traction, ensuring consistent tire performance over time.
Implementation Method 1
the HPM is functionalized with at least one functional group, and in another embodiment, the at least one functional group comprises a silane structure to provide at least one silane-functionalized hydrocarbon polymer modifier
Implementation Method 2
The Si-HPM is made in a pre-reaction and is anchored or anchorable via the functional group(s) to another component in the elastomeric composition
Implementation Method 3
by which the functionalized HPM can be coupled to the at least one elastomer, to the at least one filler, or to both
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) made in a pre-reaction 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.