Multi-component copolymer with aromatic vinyl ratio for crack growth resistance
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Solution Overview
Problem
Conventional rubber compositions, such as those based on diene rubbers, lack sufficient crack growth resistance and wet performance, necessitating the development of a multi-component copolymer with improved durability and traction on wet surfaces.
Innovation Solution
A multi-component copolymer comprising conjugated diene units, non-conjugated olefin units, and aromatic vinyl units, with a specific ratio of aromatic vinyl units in both crystalline and amorphous parts, enhancing crack growth resistance and wet performance through optimized molecular structure and crosslinking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional diene based rubbers (BR, SBR) are used, then the rubber composition can be easily manufactured, but the crack growth resistance is insufficient
Solution Approach 1:
The patent uses a composite rubber composition consisting of multiple rubber components (first rubber component with high cis-1,4 bond content conjugated diene copolymer, second rubber component as diene rubber, and third rubber component as polyolefin rubber) to achieve both high crack growth resistance and ease of manufacture. The specific composite structure allows the material to meet durability requirements while maintaining manufacturability through established rubber processing methods.
2Reliability
If copolymer with high non-conjugated olefin content is used to improve crack growth resistance, then wet performance deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct regions within the rubber composition with different functional properties. The first rubber component provides crack growth resistance through its high cis-1,4 bond content conjugated diene structure, while the second rubber component (diene rubber) and third rubber component (polyolefin rubber) contribute to wet performance. This localized functional distribution allows the composition to achieve both high crack growth resistance and good wet performance simultaneously.
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 multi-component copolymer exhibits excellent crack growth resistance and wet performance, making it suitable for rubber articles like tires and conveyor belts, with improved durability and traction on wet surfaces.
Implementation Method 1
a copolymer having crystalline and amorphous parts
Data Source
AI summary
Provided is a multi-component copolymer having crack growth resistance and wet performance. The multi-component copolymer comprises conjugated diene units, non-conjugated olefin units and aromatic vinyl units, wherein: a ratio among all of the aromatic vinyl units of at least one aromatic vinyl unit existing in amorphous parts inclusive of the conjugated diene units is 50% or more.