Rubber composition and pneumatic tire using same

Abstract

The invention provides a rubber composition which achieves higher silica dispersibility without lowering workability and hardness, while having excellently low fuel consumption properties; and a pneumatic tire which uses this rubber composition. A rubber composition which is obtained by blending 5-200 parts by mass of (B) silica relative to 100 parts by mass of (A) a diene rubber, 1-20% by mass of (C) a silane coupling agent relative to the silica, and 1-20% by mass of (D) a glycerol mono-fatty acid ester relative to the mass of silica, said glycerol mono-fatty acid ester being derived from a fatty acid having 8-24 carbon atoms. With respect to this rubber composition, 10 parts by mass or more in 100 parts by mass of the component (A) has a heteroatom-containing functional group in the main chain and / or at an end.

Description

technical field [0001] The present invention relates to a rubber composition and a pneumatic tire using the same. pneumatic tires. Background technique [0002] In recent years, the method of compounding silica into tires has been known in response to the increasingly stringent demand for high performance tires. However, silica tends to aggregate due to the formation of hydrogen bonds due to silanol groups present on the surface of its particles, and it is generally difficult to improve its dispersibility. [0003] Therefore, a technique of introducing a functional group that interacts with silica into a polymer constituting the matrix of the rubber composition has been proposed. However, such a polymer has a strong interaction between silica-polymer and polymer-polymer, and there is a problem that the viscosity of unvulcanized rubber increases and processability deteriorates. [0004] Therefore, although the viscosity can be lowered by increasing the amount of softening ...

AI Technical Summary

Problems solved by technology

However, such a polymer has a strong interaction between silica-polymer and polymer-polymer, and there is a problem that the viscosity of unvulcanized rubber increases and processability deteriorates.

[0004] Therefore, although the viscosity can be lowered by increasing the amount of softening agent such as processing oil, in this case, there are problems such as lowering of hardness, impairment of handling stability, and deterioration of tan δ (60°C) , the desired low fuel consumption cannot be obtained

However, in the prior art, sufficient dispersibility of silica cannot be obtained, and it is impossible to simultaneously improve hardness and low fuel consumption without reducing processability and hardness.

Images