Copolymer Rubber Composition Balancing Fracture, Wet Grip, and Heat Buildup
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Solution Overview
Problem
Existing rubber compositions for tires struggle to balance excellent fracture resistance, wet grip properties, and reduced heat buildup, which are essential for safety and efficiency in tire applications.
Innovation Solution
A rubber composition comprising a specific copolymer represented by general formula (1) and a filler, preferably silica, produced through a cross-metathesis reaction between ethylenically unsaturated polymers, which enhances compatibility and improves mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber compositions are used to achieve excellent fracture resistance, then wet grip properties deteriorate and heat buildup increases
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating a specific copolymer structure with formula (1) containing norbornene compound units and cyclopentene units in controlled ratios, which fundamentally alters the rubber's mechanical and thermal properties to achieve fracture resistance without excessive heat buildup
Solution Approach 2:
The patent creates a composite rubber composition by combining the specific copolymer (formula 1) with fillers and other rubber components, where the copolymer's unique molecular structure provides fracture resistance while the composite formulation controls heat generation through improved molecular packing and reduced hysteresis
2Strength
If conventional rubber compositions are used to achieve excellent fracture resistance, then wet grip properties deteriorate
Solution Approach 1:
The patent modifies the polymer's chemical structure parameters by using a copolymer with specific norbornene and cyclopentene unit ratios, which changes the molecular flexibility and surface characteristics to maintain wet grip while improving fracture resistance
Solution Approach 2:
The patent develops a composite system where the specific copolymer works synergistically with fillers and processing aids to achieve both fracture resistance and wet grip properties through improved interfacial adhesion and molecular orientation
3Loss of energy
If high fuel efficiency (low heat buildup) is required, then excellent wet grip properties deteriorate
Solution Approach 1:
The patent optimizes the copolymer's molecular parameters including unsaturated bond content (10-40 mol%) and structural unit ratios, which simultaneously reduces hysteresis losses for lower heat buildup while maintaining surface properties necessary for wet grip through controlled crystallinity and molecular orientation
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 composition results in a cross-linked rubber with superior fracture resistance, wet grip properties, and reduced heat buildup, making it suitable for tire applications and other rubber products.
Implementation Method 1
a cross-linked rubber obtained by cross-linking a rubber composition
Implementation Method 2
allowing a cross-metathesis reaction to occur between a first ethylenically unsaturated polymer having an alicyclic structure and a second ethylenically unsaturated polymer having no alicyclic structures in the presence of a metathesis catalyst
Data Source
AI summary
A rubber composition including a copolymer represented by general formula (1) and a filler,wherein R1 to R4 each independently represent a hydrogen atom, a halogen atom, an optionally substituted hydrocarbon group having 1 to 20 carbon atoms, or a substituent containing a silicon atom, an oxygen atom, or a nitrogen atom, “x” is 0 to 2, R5 represents a hydrogen atom or a methyl group, “p” is 30 to 2000, and “n” is 200 to 5000; R1 and R2, and R3 and R4 may each be bonded together to form a ring; and multiple R1s to R5s may be the same or different from each other, and the values of a plurality of “x” may be the same or different.