Rubber composition for tire treads

A rubber composition and tire tread technology, which is applied to special tires, tire parts, rolling resistance optimization, etc., can solve the problems of insufficient wear resistance, deterioration of dispersion, and low reinforcement effect, so as to reduce rolling resistance, Improved dispersibility and low heat generation effect

Active Publication Date: 2013-08-07
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the affinity between silica and diene rubber is insufficient, and the dispersibility may become insufficient. In this case, the effect of changing the dynamic viscoelastic properties such as the loss tangent (tan δ) of the rubber composition cannot be sufficiently obtained. The problem
In addition, silica tends to have a lower reinforcing effect when blended into the rubber component than carbon black, so there are problems such as poor dispersibility and insufficient wear resistance.

Method used

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  • Rubber composition for tire treads
  • Rubber composition for tire treads
  • Rubber composition for tire treads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0108] Seventy types of rubber compositions for tire treads (Examples 1 to 29, Comparative Examples 1 to 41) composed of the compounds shown in Tables 1 to 11 were prepared by mixing components other than sulfur and vulcanization accelerators with those shown in Table 12. The common compounding components shown were kneaded in a 16 L closed mixer at 150° C. for 6 minutes, sulfur and a vulcanization accelerator were added to the released masterbatch, and kneading was carried out using an open roll to prepare. In Tables 1 to 11, when the SBR contains extended oil, the compounded amount of SBR containing extended oil is described, and the compounded amount of SBR excluding the net weight of oil is described in parentheses. In addition, the amounts of the commonly compounded components shown in Table 12 are compounded in parts by weight relative to 100 parts by weight of the diene rubbers described in Tables 1 to 11 (rubber weight by net weight).

[0109] The obtained 70 types of ...

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PUM

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Abstract

Provided is a rubber composition for tire treads, and the rubber composition brings about lower rolling resistance and better control stability than the conventional levels. The rubber composition is characterized by comprising 100 parts by weight of a diene rubber containing at least 40 wt% of a modified conjugated-diene polymer rubber, and 66-110 parts by weight of a filler comprising at least 50 wt% of silica. The composition is further characterized in that the modified conjugated-diene polymer rubber has modifying end groups obtained by reacting at least one compound with active conjugated-diene polymer chains obtained by copolymerizing a conjugated-diene monomer and an aromatic vinyl monomer in a hydrocarbon solvent by using an organic active metal compound as an initiator, the at least one compound having a functional group reactive with the active ends of the polymer chains, the modifying end groups including a functional group that interacts with silica, and that the modified conjugated-diene polymer rubber has an aromatic-vinyl unit content of 38-48 wt%, a vinyl unit content of 20-35%, and a weight-average molecular weight of 600,000-1,000,000.

Description

technical field [0001] The present invention relates to a rubber composition for tire treads, and more specifically relates to a rubber composition for tire treads with further reduced rolling resistance. Background technique [0002] In recent years, excellent handling stability has been demanded as performance required for pneumatic tires, and fuel efficiency has been demanded to be excellent in accordance with increasing interest in global environmental issues. In order to improve handling stability, it is known to make tires rigid. However, if the amount of filler compounded in the rubber composition constituting the tread portion is increased in order to increase the rigidity of the tire, the fuel consumption performance will decrease. Therefore, by adding a large amount of silica to the rubber composition for treads, heat generation is suppressed and rolling resistance is reduced, thereby improving the fuel consumption performance of the pneumatic tire. In addition, ...

Claims

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Application Information

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IPC IPC(8): C08L15/00B60C1/00C08C19/25C08G81/02C08K3/36
CPCC08K7/00C08G81/02C08C19/25C08C19/44C08K3/36B60C1/0016B60C1/00C08L15/00C08L9/00C08L7/00Y02T10/86
Inventor 佐藤正树城川隆芦浦诚龟田庆宽那贺步前岛圭介
Owner YOKOHAMA RUBBER CO LTD
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