Rubber Composition Using Polyalkylacrylate for Heat-Resistant Stiffness
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Solution Overview
Problem
Rubber compositions for tires and other applications face challenges in achieving high stiffness while maintaining low weight and heat resistance, as ultra-high molecular weight polyethylene (UHMWPE) has a low melting point and is difficult to process, and increasing filler amounts can lead to weight gain and mixing issues.
Innovation Solution
Incorporating a thermoplastic polymer with a poly alkylacrylate structure, featuring a polycyclic substituent at its single bonded oxygen atom, which enhances stiffness, processability, and heat resistance, and provides better dispersion and reinforcement without the drawbacks of high filler amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultra-high molecular weight polyethylene (UHMWPE) is used to improve stiffness, then stiffness is improved, but processing difficulty increases and melting point remains low
Solution Approach 1:
The patent changes the chemical structure parameters of the thermoplastic polymer by introducing polycyclic substituents at the alpha position of polyalkylacrylate chains. This structural modification raises the melting point from 135°C (UHMWPE) to above 150°C while maintaining high stiffness, thereby improving processability without sacrificing the desired mechanical properties.
Solution Approach 2:
The patent creates a composite rubber composition incorporating elastomer, filler, and specifically designed polyalkylacrylate thermoplastic polymer with polycyclic substituents. This composite approach combines the advantages of rubber elasticity, filler reinforcement, and thermoplastic stiffness while avoiding the processing difficulties of UHMWPE through the modified polymer structure.
2Strength
If filler amount is increased to improve stiffness, then stiffness is improved, but weight increases and mixing becomes difficult
Solution Approach 1:
The patent changes from using high amounts of inorganic filler to using a specifically designed thermoplastic polymer with polycyclic substituents. This parameter change achieves comparable or superior stiffness reinforcement while significantly reducing the weight increase that would result from adding large amounts of filler materials.
Solution Approach 2:
The patent uses polyalkylacrylate thermoplastic polymer as an organic alternative to inorganic filler materials. The polycyclic substituent structure copies the reinforcement function of fillers like silica or carbon black but with the advantages of organic polymers: better processability, reduced weight, and improved dispersion in the rubber matrix.
3Strength
If filler amount is increased to improve stiffness, then stiffness is improved, but hysteresis increases
Solution Approach 1:
The patent changes the reinforcement mechanism from inorganic filler-based to thermoplastic polymer-based with polycyclic substituents. This parameter change reduces hysteresis losses because the thermoplastic polymer reinforces through physical entanglement and crystalline structures rather than the interfacial friction and stress concentration that occur with inorganic filler-rubber interfaces.
4Temperature
If poly alkylacrylate with polycyclic substituent is used to improve stiffness, then stiffness retention beyond 120°C is improved, but material complexity increases
Solution Approach 1:
The patent introduces polycyclic substituents at the alpha position of polyalkylacrylate chains, which creates rigid structural units that maintain chain rigidity and prevent excessive chain mobility at elevated temperatures. This parameter change achieves stiffness retention beyond 120°C while the patent keeps the overall material system relatively simple by using a single primary thermoplastic polymer component alongside standard rubber and filler ingredients.
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 rubber composition achieves significant stiffness retention beyond 120°C, improved processability, and reduced hysteresis, with poly(isobornyl methacrylate) and poly(adamantyl methacrylate) demonstrating desirable properties for reinforcement and heat resistance.
Implementation Method 1
the alkylacrylate comprises a polycyclic substituent at its single bonded oxygen atom. Provision of such a poly alkylacrylate reinforces the rubber compound, wherein its substituents limit significantly the chain mobility within the material
Implementation Method 2
the poly alkylacrylate with its bulky side groups/substituents helps to enhance processability (also due to its amorphous nature) and has also a relatively high heat resistance
Implementation Method 3
In particular, there may also be less forces resulting in phase separation during mixing which may help to achieve better dispersion
Data Source
AI summary
In a first aspect of the present invention, a rubber composition is provided, comprising at least one rubber, at least one filler, at least one thermoplastic polymer, wherein the thermoplastic polymer is a poly alkylacrylate, and wherein the alkylacrylate comprises a polycyclic substituent at its single bonded oxygen atom. In another aspect of the invention, an article of manufacture such as a tire, a power transmission belt, a hose, a track, an air sleeve, and a conveyor belt is provided which comprises the rubber composition in accordance with the first aspect.