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Rubber composition and pneumatic tire using the same for tread

Inactive Publication Date: 2007-05-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a rubber composition in which both wet grip performance a

Problems solved by technology

However, in general, a rubber composition lowering rolling resistance by reducing stress and hysteresis loss at low tensile elongation (at low strain) of a tire such as at low speed running decreases stress and hysteresis loss also at high tensile elongation (at high strain) of a tire such as sudden brake, and dry grip performance can not be improved.
As a result, it has been difficult to have both lowering of rolling resistance and improvement in dry grip performance.
However, in the rubber composition compounding silica, it is known that dry grip performance is lowered, and when repeated running, grip performance is further more lowered due to decreasing rigidity of a rubber.
Also, since a silanol group which is a surface functional

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

Example 1 and Comparative Example 1

[0038] According to compounding prescriptions shown in Table 1, chemicals other than sulfur and vulcanization accelerators TBBS and DPG were kneaded under the condition at 100° C. for 5 minutes using a Banbury mixer to obtain a kneaded article. Then, sulfur and the vulcanization accelerators TBBS and DPG were added to the obtained kneaded article and the mixture was kneaded under the condition at 50° C. for 5 minutes using a roller to obtain unvulcanized rubber compositions. The obtained unvulcanized rubber compositions were press-vulcanized under the condition at 170° C. for 20 minutes to obtain vulcanized rubber compositions of Example 1 and Comparative Example 1 (preparation process 1).

Example

Comparative Example 2

[0039] Only a rubber and silica were mixed in toluene first, not kneaded in a Banbury mixer, then, a rubber / silica masterbatch in which toluene was removed in a bath with a constant temperature at 70° C. was prepared, thereafter, a vulcanized rubber composition of Comparative Example 2 was obtained in the same manner as the preparation process 1 besides mixing a coupling agent, stearic acid and zinc oxide by using a roll (preparation process 2).

(Average Diameter, Average Length, and Aspect Ratio of Silica)

[0040] Regarding an average diameter (D), an average length (L), and an aspect ratio (L / D) of silica, silica dispersed in vulcanized rubber compositions was observed by a transmission electron microscope, and a long diameter and a short diameter of arbitrary 30 particles were measured, and average values of these are respectively referred to as D and L, and L / D is calculated from D and L.

[0041] The above measured D, L and L / D of silica in the vulcanized ru...

Example

(Rolling resistance index)=(Tan δ of Comparative Example 1) / (Tan δ of respective compositions)×100

(Wet Grip Performance)

[0043] Rubber test pieces formed into a cylindrical shape having a length of 20 mm and a diameter of 100 mm are prepared from the prepared vulcanized rubber compositions, and using a flat belt abrasion tester (FR5010) manufactured by Ueshima Seishakusho Co., Ltd., under the conditions of a speed at 20 km / h, a load of 4 kgf, an outside air temperature at 30° C., and a water temperature at 25° C., the maximum value of friction coefficient is read, which is detected at the time when a slip ratio of a sample for a wet road surface is changed from 0 to 70%. Then, wet grip performance of Example 1 and Comparative Examples 1 and 2 are expressed as an index calculated in accordance with the following equation, assuming wet grip index of Comparative Example 1 as 100. It indicates that the larger the wet grip index is, the more excellent wet grip performance is.

(Wet grip...

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Abstract

A rubber composition, in which wet grip performance and dry grip performance can be improved without lowering rolling resistance property, and a pneumatic tire using the same for a tread. The rubber composition comprising 5 to 150 parts by weight of silica having an aspect ratio of 2 to 20 based on 100 parts by weight of a rubber component containing a diene rubber is provided.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a rubber composition and a pneumatic tire. [0002] In recent years, from environmental issues such as global warming, social requirements for low fuel consumption efficiency have been enhanced, and development of low fuel efficient tire in which rolling resistance is lowered has been desired in response to low fuel consumption efficiency of an automobile. [0003] However, in general, a rubber composition lowering rolling resistance by reducing stress and hysteresis loss at low tensile elongation (at low strain) of a tire such as at low speed running decreases stress and hysteresis loss also at high tensile elongation (at high strain) of a tire such as sudden brake, and dry grip performance can not be improved. As a result, it has been difficult to have both lowering of rolling resistance and improvement in dry grip performance. [0004] As a method of reducing rolling resistance of a tire, an technique of substituting c...

Claims

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Application Information

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IPC IPC(8): B60C1/00
CPCB60C1/0016C08K3/36C08K5/548C08L9/06C08L21/00C08K2201/016Y02T10/86
Inventor MABUCHI, TAKAHIRONAITO, MASATO
Owner SUMITOMO RUBBER IND LTD
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