Rubber composition for tire and studless tire

By using modified natural rubber and butadiene rubber in the tire rubber composition, and adding fine silica with a specific specific surface area, the problem of balancing fuel economy and wear resistance with performance on ice and snow is solved, improving nail-free performance. Overall performance of anti-skid tires.

Inactive Publication Date: 2011-07-06
SUMITOMO RUBBER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the case of reducing rolling resistance to improve fuel economy, since fuel economy and wear resistance often conflict with each other, wear resistance tends to decrease
Therefore, it is often difficult to improve both properties simultaneously
In addition, although studless tires are also required to exhibit better performance on ice and snow (grip performance on ice and snow), this performance also conflicts with fuel economy in many cases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 4 and comparative example 1 to 3

[0106] According to each formulation as shown in Table 2, chemicals other than sulfur and a vulcanization accelerator were mixed with a Banbury mixer to produce a mixture. Then, sulfur and vulcanization accelerators are added to the mixture produced and they are mixed with an open mill. Thus, an unvulcanized rubber composition was produced. The unvulcanized rubber composition thus produced is molded into a tread shape and then combined with other tire components to obtain an unvulcanized tire. The unvulcanized tire was then pressure vulcanized at 170° C. for 10 minutes. Thus, a test tire (size: 195 / 65R15, studless tire for passenger cars) was produced.

[0107] The produced test tires were tested in the following manner.

[0108] (rolling resistance)

[0109] The produced test tire was mounted on a rim (15×6JJ), and the rolling resistance was measured with a rolling resistance tester under the following operating conditions: tire pressure of 230 kPa, load of 3.43 kN, speed...

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PUM

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Abstract

An object of the present invention is to provide a rubber composition for a tire, which can achieve well-balanced improvement in fuel economy, abrasion resistance, and performance on ice and snow, and a studless tire for a passenger vehicle using the rubber composition. The present invention relates to a rubber composition for a tire, including a rubber component and silica, wherein the rubber component contains a modified natural rubber with a phosphorus content of 200 ppm or less, and butadiene rubber, and the silica has a CTAB specific surface area of 180 m 2 / g or more and a BET specific surface area of 185 m 2 / g or more.

Description

technical field [0001] The present invention relates to a rubber composition for tires and a studless antiskid tire (winter tire) for passenger cars using the rubber composition as a tread. Background technique [0002] In Japan, the use of studded tires is prohibited by law in order to prevent dust pollution caused by studded tires, so studless tires are now used instead of studded tires in cold regions. Studless tires have been improved in material and design, and, for example, a rubber composition containing a diene rubber having excellent low-temperature properties has been proposed. [0003] In recent years, a tire exhibiting excellent fuel economy has been demanded as a studless tire for passenger cars from an environmental point of view. In order to obtain good fuel economy, rubber compositions for tires have a rubber component mainly containing natural rubber in many cases. [0004] However, in the case of reducing rolling resistance to improve fuel economy, since ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08L15/00C08L9/00C08K3/36B60C1/00
CPCC08K3/36C08L7/00Y02T10/862C08K3/04C08K5/548C08L9/00B60C1/0016C08C1/04C08L2666/08
OwnerSUMITOMO RUBBER INDUSTRIES LTD