Conjugated Diene Polymer Branch Control for Oil-Free Bale Formability
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Solution Overview
Problem
Conjugated diene-based polymers with high molecular weights face issues with peeling off from bales, leading to environmental pollution and reduced formability when the amount of process oil is minimized for improved compounding freedom.
Innovation Solution
A conjugated diene-based polymer with specific Mooney viscosity, Mooney stress relaxation, and a branch number distribution curve shape that is convex downward, along with a defined glass transition temperature and molecular weight distribution, ensuring excellent bale formability without the addition of process oil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the molecular weight of conjugated diene-based polymer is increased to improve abrasion resistance, then abrasion resistance is improved, but polymer particles are easily peeled off from the surface of bales
Solution Approach 1:
The patent applies parameter changes by precisely controlling the branch number distribution curve shape (making it convex downward) and setting specific Mooney viscosity (80-170) and Mooney stress relaxation (0.30-0.80) parameters. This resolves the contradiction by modifying the polymer's molecular structure parameters to achieve both high abrasion resistance and reduced particle peeling off without requiring process oil.
2Adaptability or versatility
If the amount of process oil to be added is reduced to improve compounding freedom, then compounding freedom is improved, but sufficient formability cannot be obtained
Solution Approach 1:
The patent changes the physical and chemical parameters of the polymer by controlling the branch number distribution curve shape to be convex downward and setting specific Mooney viscosity and Mooney stress relaxation values. These parameter changes enable the polymer to maintain excellent bale formability without requiring process oil, thus achieving both compounding freedom and formability.
3Object-affected harmful factors
If no process oil is included in the composition to improve environmental cleanliness, then environmental cleanliness is improved, but polymer particles are easily peeled off from the surface of bales
Solution Approach 1:
The patent resolves this contradiction by changing the polymer's structural parameters - specifically making the branch number distribution curve convex downward and controlling Mooney viscosity (80-170) and Mooney stress relaxation (0.30-0.80). These parameter changes eliminate the need for process oil while simultaneously preventing polymer particle peeling off, thus achieving both environmental cleanliness and reduced pollution.
Data Source
AI summary
A conjugated diene-based polymer, satisfying the following <condition (i)> to <condition (iii)>:<condition (i)>a Mooney viscosity measured at 100° C. is 80 or more and 170 or less;<condition (ii)>a Mooney stress relaxation (MSR) measured at 100° C. is 0.30 or more and 0.80 or less; and<condition (iii)>the polymer has an extreme value that is convex downward in a branch number distribution curve indicating a relationship between an absolute molecular weight and a branch number (Bn), as measured by viscosity detector-equipped GPC-light scattering measurement.