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Rubber composition for tread, and pneumatic tire

A rubber composition, rubber technology, applied in special tires, tire parts, transportation and packaging, etc., can solve the problem of handling stability (deterioration of handling performance, difficulty in balancing wet grip performance and processability, reduced grip performance) and other problems, to achieve the effect of improving wet grip performance, improving handling stability, and excellent performance balance

Active Publication Date: 2014-02-05
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In general, when the energy loss of the tread cap rubber is reduced, there are problems that the grip performance is lowered, and the wear resistance and damage cutting performance are also deteriorated. Furthermore, the use of a modified polymer for silica reduces the energy loss. When it decreases, the processability will also deteriorate if the mixing amount is large
In addition, when reducing the amount of reinforcing agent to reduce energy loss, the rubber rigidity tends to decrease and the handling stability (handling performance) tends to deteriorate.
Therefore, in the tread cap rubber, it is difficult to improve handling stability, wear resistance, and low fuel consumption in a good balance, and further, it is difficult to obtain wet grip performance and processability in a good balance.
[0006] For example, in Patent Document 1, a rubber composition containing modified styrene-butadiene rubber, silica, etc. for improving performance such as low fuel consumption is disclosed. room for

Method used

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  • Rubber composition for tread, and pneumatic tire
  • Rubber composition for tread, and pneumatic tire
  • Rubber composition for tread, and pneumatic tire

Examples

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Embodiment Construction

[0022] The rubber composition for treads of the present invention contains: terminal-modified solution-polymerized styrene-butadiene rubber (hereinafter, also referred to as "modified SBR"), butadiene rubber synthesized using a rare earth element-based catalyst (hereinafter, , also known as "rare earth BR") and reinforcing agent.

[0023] By using modified SBR and rare earth BR in combination with a reinforcing agent, the balance of handling stability (handling performance), wear resistance, and low fuel consumption can be improved, and the balance of these properties can be synergistically improved. In addition, by further blending SBR with a specific Mw with a high styrene content, the wet grip performance can be improved without deteriorating the fuel economy, and in addition to the handling stability, wear resistance, and fuel economy, it is also Improved wet grip performance can be balanced well. On the other hand, although there is a concern that the kneading processabi...

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Abstract

The present invention provides a rubber composition for a tread which enables not only to improve handling stability, abrasion resistance, and fuel economy in a balanced manner, but also to improve wet grip performance and processability in a balanced manner, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a tread, comprising a terminally-modified solution-polymerized styrene-butadiene rubber, a butadiene rubber synthesized in the presence of a rare earth catalyst, and a reinforcing agent.

Description

technical field [0001] The present invention relates to a rubber composition for treads and a pneumatic tire having a tread produced from the composition. Background technique [0002] In order to protect the global environment, we are promoting the reduction of fuel consumption in automobiles. Therefore, even for automobile tires, tires with low rolling resistance are desired. [0003] The rolling resistance of the tire is the cause of large energy loss due to repeated deformation during forward running. As a method of reducing rolling resistance, for example, the following structures and the like have been proposed: [0004] Using two layers of rubber in the tread portion that contributes the most to rolling resistance in the tire components, a rubber composition with low energy loss is prepared on the inner side (tread base) and an excellent wear resistance on the outer side (tread cap) rubber composition. [0005] In general, when the energy loss of the tread cap rub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08L15/00C08K3/04C08K3/36B60C1/00
CPCY02T10/862C08L9/06C08L9/00B60C1/0016C08L15/00C08K3/04C08K3/36C08K3/013
Inventor 近藤俊一
Owner SUMITOMO RUBBER IND LTD
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