Rubber composition and pneumatic tire

Abstract

This invention provides a rubber composition capable of improving workability, low fuel consumption, rubber strength, abrasion resistance, and wet grip performance in a balanced manner; and a pneumatic tire in which same is used. This invention relates to a rubber composition comprising, at the active end of a copolymer, a conjugated diene polymer obtained by reacting a compound containing a nitrogen atom and / or a silicon atom, and silica having a nitrogen-adsorption specific surface area of 40-400 m2 / g. The copolymer is obtained by polymerizing a monomer component comprising a conjugated diene compound and a silicon-containing vinyl compound using a polymerization initiator as represented by formula (I). The amount of the conjugated diene polymer and the amount of the polyisoprene rubber content are 1 to 60wt% and 0-99wt%, respectively, relative to 100wt% of the rubber component. The silica content is 10-80 parts by weight to 100 parts by weight of rubber component, and the carbon ratio is at least 50.

Description

technical field [0001] The present invention relates to a rubber composition and a pneumatic tire produced using the same. Background technique [0002] In recent years, due to increasing attention to environmental issues, there has been a strong demand for low fuel consumption of automobiles, and rubber compositions used in automobile tires are also required to have excellent low fuel consumption. As a rubber composition for automobile tires, a rubber composition containing a conjugated diene-based polymer such as polybutadiene or butadiene-styrene copolymer, and a filler such as carbon black or silica is generally used Wait. [0003] As a method of improving low fuel consumption, for example, Patent Document 1 proposes a method of using a diene-based rubber (modified rubber) modified with an organosilicon compound containing an amino group and an alkoxy group. However, when the modified rubber is used, the reaction efficiency between silica and rubber (polymer) is improv...

AI Technical Summary

Problems solved by technology

However, when using modified rubber, on the one hand, the reaction efficiency between silica and rubber (polymer) is improved, and the fuel consumption is improved, but on the other hand, the Mooney viscosity tends to increase and the workability tends to deteriorate. Difficult to balance low fuel consumption and workability

In addition, when using modified rubber, the combination of silica and rubber is too tight, and the strength and abrasion resistance of the rubber may also decrease

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