Rubber composition for tire tread and pneumatic tire

A rubber composition and tire tread technology, which is applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of non-dispersion of silica, high agglomeration, and inability to fully obtain wet road performance and rolling performance , to achieve the effect of excellent suppression of time-dependent changes and excellent effect

Active Publication Date: 2020-12-22
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the affinity between silica and rubber components is low, and the cohesion between silica is high, even if only two Silica also has the problem that the effect of improving wet performance and rolling performance cannot be obtained sufficiently because silica is not dispersed.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0398] [Manufacture of specific conjugated diene rubber and comparative conjugated diene rubber]

[0399] Specific conjugated diene rubbers A1 to A4 and comparative conjugated diene rubber A were produced as follows.

[0400] Here, the specific conjugated diene rubbers A1 to A4 are conjugated diene rubbers produced by the method for producing conjugated diene rubbers having the above-mentioned first to third steps, and correspond to the above-mentioned specific conjugated diene rubbers. rubber. Furthermore, the specific conjugated diene rubbers A1 to A2 are conjugated diene rubbers in which the first step includes the aforementioned steps A and B, and the specific conjugated diene rubbers have a PI block.

[0401]On the other hand, comparative conjugated diene-based rubber A is a conjugated diene-based rubber produced by a method for producing a conjugated diene-based rubber including the above-mentioned first to second steps (without the above-mentioned third step), and is n...

Embodiment B

[0468] [Manufacture of specific conjugated diene rubber and comparative conjugated diene rubber]

[0469] Specific conjugated diene rubbers B1 to B2 and comparative conjugated diene rubbers B1 to B2 were produced as follows.

[0470] Here, the specific conjugated diene-based rubbers B1 to B2 are conjugated diene-based rubbers produced by the method for producing conjugated diene-based rubbers including the above-mentioned first to third steps, and correspond to the above-mentioned specific conjugated diene-based rubbers. rubber. Furthermore, the specific conjugated diene rubber B1 is a conjugated diene rubber in which the first step includes the aforementioned steps A and B, and the specific conjugated diene rubber has a PI block.

[0471] On the other hand, the comparative conjugated diene rubbers B1 and B2 are conjugated diene rubbers produced by the method for producing conjugated diene rubbers including the above-mentioned first to second steps (without the above-mentione...

Embodiment C

[0547] [Manufacture of specific conjugated diene rubber and comparative conjugated diene rubber]

[0548] Specific conjugated diene rubbers C1 to C4 and comparative conjugated diene rubber C were produced as follows.

[0549] Here, the specific conjugated diene-based rubbers C1 to C4 are conjugated diene-based rubbers produced by the method for producing conjugated diene-based rubbers including the above-mentioned first to third steps, and correspond to the above-mentioned specific conjugated diene-based rubbers. rubber. Furthermore, the specific conjugated diene rubbers C1 to C2 are conjugated diene rubbers in which the first step includes the aforementioned steps A and B, and the specific conjugated diene rubbers have a PI block.

[0550] On the other hand, the comparative conjugated diene rubber C is a conjugated diene rubber produced by a method for producing a conjugated diene rubber that includes the above-mentioned first to second steps (without the above-mentioned thi...

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Abstract

The purpose of the present invention is to provide: a rubber composition for a tire tread which, when incorporated in a tire, provides excellent wet performance and rolling performance, and which hasexcellent processability; and a pneumatic tire using the rubber composition for a tire tread. This rubber composition for a tire tread contains: a conjugated diene rubber containing 20% by mass or more of a specific conjugated diene rubber produced by a conjugated diene rubber production method including a specific step; silica containing 20% by mass or more of a specific silica having a CTAB-adsportion specific surface area of 170 m2/g or more; and a silane coupling agent. The silica content is 30 parts by mass or more relative to 100 parts by mass of the conjugated diene rubber. The silane coupling agent content is 3-40% by mass relative to the silica content.

Description

technical field [0001] The present invention relates to a rubber composition for tire treads and a pneumatic tire. Background technique [0002] In recent years, from the viewpoint of safety during vehicle running, improvements in wet performance (wet grip performance) (braking performance on wet road surfaces) of tires have been demanded. In addition, from the viewpoint of low fuel consumption when the vehicle is running, it is required to improve the rolling performance (low rolling resistance) of tires. On the other hand, there is known a method of compounding silica into a rubber component constituting a tread portion of a tire to improve wet performance and rolling performance. [0003] However, since the affinity between silica and the rubber component is low, and the cohesion between silica is high, even if only silica is blended in the rubber component, there is a problem that the silica is not dispersed, and it is not possible to obtain sufficient The problem is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00B60C1/00C08C19/25C08F297/04C08K3/36C08K5/5415
CPCC08K3/36C08G77/442C08G77/14C08K2201/006B60C1/0016C08F297/046C08F299/08C08L53/025C08L9/00C08L83/06C08G77/388C08K5/544C08L83/08C08L83/10Y02T10/86C08L15/00C08L83/00C08L9/06
Inventor 佐藤正树饰矢理起佐和秀彬芦浦诚
Owner YOKOHAMA RUBBER CO LTD
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