Tire Rubber Composition Using Liquid SBR and Hydrogenated Resin

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Solution Overview

Problem

Conventional tire rubber compositions using styrene-butadiene rubber (SBR) with high glass transition temperature provide improved grip performance but exhibit temperature dependence, resulting in significant differences in performance at low and high temperatures.

Innovation Solution

Incorporating a liquid styrene-butadiene copolymer, hydrogenated dicyclopentadiene resin with a degree of hydrogenation of 50 mol% or higher, and thiuram vulcanization accelerator into tire rubber compositions, along with other rubbers and carbon black, to enhance grip performance across temperature ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If styrene-butadiene rubber (SBR) with high glass transition temperature is used, then grip performance is improved, but temperature dependence increases resulting in significant performance difference between low and high temperatures

Engineering Contradiction:

Improvegrip performanceVSAvoidtemperature adaptability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses a composite rubber composition combining SBR with polybutadiene rubber and specific additives (hydrogenated nitrile rubber, styrene resin, zinc borate) to create a material that maintains grip performance across different temperatures. The composite structure allows each component to contribute different properties: SBR provides grip while polybutadiene reduces temperature dependence

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical composition parameters of the rubber by controlling the styrene content (20-40 mass%), butadiene content (60-80 mass%), and adding specific additives in controlled amounts. This parameter optimization balances grip performance with temperature adaptability

Inventive Principle:

Principle #35Parameter changes

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 solution provides improved grip performance at both low and high temperatures by maintaining flexibility and compatibility, reducing temperature-dependent variations in tire rubber performance.

Implementation Method 1

at least one hydrogenated dicyclopentadiene resin

Methodology Applied

Scientific EffectHydrogenation: Hydrogenation

Implementation Method 2

at least one thiuram vulcanization accelerator

Methodology Applied

Scientific EffectVulcanization: Chemical Bonding

Implementation Method 3

at least one liquid styrene-butadiene copolymer

Methodology Applied

Scientific EffectPolymer elasticity: Elasticity

Data Source

PatentEP3936563B1Tire rubber composition and tire

Publication Date: 2023.05.10 SUMITOMO RUBBER INDUSTRIES LTD

AI summary

The present invention aims to provide rubber compositions which provide improved overall performance in terms of grip performance at low temperatures and grip performance at high temperatures, as well as tires including the rubber compositions. Included are tire rubber compositions containing at least one liquid styrenebutadiene copolymer, at least one hydrogenated dicyclopentadiene resin, and at least one thiuram vulcanization accelerator.