Tackified Rubber Composition for Break Resistance and Processability

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Solution Overview

Problem

Rubber compositions containing multicomponent copolymers with conjugated diene, non-conjugated olefin, and aromatic vinyl units exhibit poor processability and adhesion, leading to decreased productivity in rubber products like tires and hoses due to their hard state at room temperature and low tackiness.

Innovation Solution

Incorporating a tackifier with the rubber composition, specifically a multicomponent copolymer containing a conjugated diene, non-conjugated olefin, and aromatic vinyl units, along with optional softeners and liquid rubber, to enhance breaking resistance and processability while maintaining weather resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a multicomponent copolymer containing conjugated diene, non-conjugated olefin, and aromatic vinyl units is used as a rubber component, then breaking resistance is improved, but processability deteriorates due to hard state at room temperature and low tackiness

Engineering Contradiction:

Improvebreaking resistanceVSAvoidprocessability

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent changes the chemical composition parameters of the rubber component by incorporating a multicomponent copolymer with specific monomer ratios (conjugated diene: non-conjugated olefin: aromatic vinyl in ranges of 5-50:40-90:5-30 mol%). This compositional parameter change allows achieving both improved breaking resistance and acceptable processability by optimizing the balance between molecular structure and processing characteristics

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite rubber composition by combining the multicomponent copolymer with other rubber components (such as polybutadiene, polyisoprene, or styrene-butadiene copolymer) in specific ratios. This composite approach allows the final material to exhibit both the high breaking resistance from the multicomponent copolymer and the processability from the complementary rubber components

Inventive Principle:

Principle #40Composite materials

2Strength

Engineering Contradiction:

Improvebreaking resistanceVSAvoidadhesion

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent adjusts the aromatic vinyl content parameter within specific ranges (5-30 mol%) to optimize the balance between breaking resistance and adhesion. The aromatic vinyl units provide polarity and interaction sites that enhance adhesion while maintaining the structural integrity needed for breaking resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent combines the multicomponent copolymer with adhesive promoters or other rubber components that have good adhesion properties. This composite strategy allows the final product to achieve both high breaking resistance from the copolymer structure and improved adhesion from the complementary materials

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3725840B1Rubber composition, tire, conveyor belt, rubber crawler, Anti-vibration device, seismic isolation device, and hose

Publication Date: 2024.08.07 BRIDGESTONE CORP

AI summary

Provided is a rubber composition having excellent breaking resistance and processability. A rubber composition comprises: a rubber component (a) containing a multicomponent copolymer (a1) that contains a conjugated diene unit, a non-conjugated olefin unit, and an aromatic vinyl unit; and a tackifier (b).