SiOR-Functionalized Diene Elastomer Tire Composition
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Solution Overview
Problem
Recent developments in low rolling resistance tires have led to a reduction in the tackiness of rubber compositions before curing, which complicates the tire-building process by reducing the adhesion between tire layers before vulcanization.
Innovation Solution
A rubber composition comprising 20 to 70 phr of a first diene elastomer with SiOR functions, 20 to 70 phr of a second diene elastomer such as polyisoprene, and optionally 0 to 20 phr of a third diene elastomer, reinforced with a predominantly inorganic filler like silica, improves the tackiness by maintaining the necessary adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rubber compositions are modified to be based on functional diene elastomer for low rolling resistance tires, then rolling resistance is reduced, but tack of rubber compositions before curing is diminished
Solution Approach 1:
The invention changes the chemical structure parameter of the diene elastomer by introducing SiOR functions at specific positions (not at chain ends) to maintain tackiness while preserving the low rolling resistance properties. This structural modification allows the rubber composition to retain both the energy efficiency and the manufacturing ease.
Solution Approach 2:
The invention creates a composite rubber composition by combining functional diene elastomer with specific inorganic fillers and other additives in optimized proportions. This composite structure achieves both low rolling resistance and adequate tackiness before curing by synergistic interaction of components.
2Loss of energy
If rubber compositions are modified for low rolling resistance, then energy efficiency is improved, but adhesion between tire layers before vulcanization is reduced
Solution Approach 1:
The invention modifies the chemical parameters of the rubber composition by incorporating SiOR-functionalized diene elastomer with specific molecular weight and functionality. This changes the intermolecular interaction parameters to maintain adhesion strength while preserving the low rolling resistance characteristics.
Solution Approach 2:
The SiOR functions act as intermediary groups that facilitate both low rolling resistance and good adhesion. These functional groups mediate the interaction between polymer chains and filler particles, creating a balanced composition that satisfies both energy efficiency and layer adhesion requirements.
Data Source
AI summary
A tire comprises a rubber composition based on at least an elastomer matrix comprising 20 to 70 phr of a first diene elastomer bearing at least one SiOR function, R being a hydrogen atom or a hydrocarbon radical, the SiOR function not located at the chain ends of the first diene elastomer, 20 to 70 phr of a second diene elastomer which is a polyisoprene, and optionally, 0 to 20 phr of a third diene elastomer; and a reinforcing filler comprising a reinforcing inorganic filler.