Diene Polymer Composition With High-Softening Resin for Cold Flow Resistance
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Solution Overview
Problem
Polymers used in tire manufacturing with added oil or resin often cause significant cold flow phenomena, necessitating improvements in cold flow resistance.
Innovation Solution
A polymer composition comprising a diene-based polymer with a number-average molecular weight of 500,000 g/mol or more and a resin with a % H Ar value of 20% or more and a softening point of 110° C. or higher, where the resin content is 20 parts by mass or more, to inhibit cold flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If oil or resin is added to improve processability, then processability is improved, but cold flow resistance deteriorates
Solution Approach 1:
The invention changes the parameters of the resin component by specifying a softening point of 110°C or higher and a %HAr value of 20% or more. This parameter selection allows the resin to provide processability improvement while maintaining cold flow resistance, resolving the contradiction between ease of manufacture and composition stability.
Solution Approach 2:
The invention creates a composite material system combining diene-based polymer with specific resin components. The composite achieves both improved processability and maintained cold flow resistance through the synergistic interaction between the polymer matrix and the high softening point resin, preventing the harmful cold flow effect while enabling good processing.
2Reliability
If high molecular weight polymer is used to meet performance requirements, then tire performance is improved, but processability deteriorates
Solution Approach 1:
The resin component acts as an intermediary substance between the high molecular weight diene-based polymer and the processing environment. It facilitates processing by reducing intermolecular friction and improving flow characteristics, while the high softening point of the resin ensures it does not cause cold flow, thus mediating between tire performance requirements and processability needs.
Solution Approach 2:
By carefully selecting resin parameters (softening point ≥110°C, %HAr ≥20%), the invention modifies the processing characteristics of the high molecular weight polymer without compromising its structural integrity and performance properties. This parameter-based approach enables both high tire performance and good processability.
Data Source
AI summary
An object of the present disclosure is to provide a polymer composition having excellent cold flow resistance, a production method therefor, a rubber composition including the polymer composition, and a tire using the rubber composition. The solution is a polymer composition comprising a diene-based polymer having a number-average molecular weight of 500,000 g/mol or more and a resin having a % H Ar value of 20% or more and a softening point of 110° C. or higher, in which a content of the resin is 20 parts by mass or more with respect to 100 parts by mass of the diene-based polymer.