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Rubber Composition For Tire, And Pneumatic Tire

A rubber composition, a technology for pneumatic tires, applied in special tires, tire parts, wheels, etc., can solve the problems of changing the resistance time of carbon black dispersion tires and other problems, and achieve excellent fuel economy, prevent The effect of static electricity accumulation, excellent durability

Active Publication Date: 2013-07-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this document has not examined in detail the dispersibility of carbon black, the change in tire resistance over time, and the durability

Method used

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  • Rubber Composition For Tire, And Pneumatic Tire
  • Rubber Composition For Tire, And Pneumatic Tire
  • Rubber Composition For Tire, And Pneumatic Tire

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0087] Here, it is more preferable that the rubber composition is produced by a production method further comprising a re-kneading step of re-kneading the kneaded product obtained by the basic kneading step 2 before the final kneading step . By carrying out the re-kneading step, the dispersibility of carbon black can be further improved and fuel economy and durability can be further improved, as well as contributing to suppression of an increase in tire resistance over time.

[0088] In the rubber composition, the dispersion ratio (measured by the SPM method) of carbon black in the phase of the diene rubber having the highest SP value is preferably 1 or more. Furthermore, the dispersion ratio thereof is preferably 5 or less, more preferably 3 or less, even more preferably 2 or less, and particularly preferably 1.5 or less. When the dispersion ratio thereof is within the above range, it indicates that the carbon black is well dispersed in the rubber composition containing two ...

Embodiment

[0213] The present invention is described in detail by way of examples, but the present invention is not limited thereto.

[0214] Various chemicals used in Examples and Comparative Examples are summarized below.

[0215]

[0216] NR (Natural Rubber): RSS#3 (SP value: 7.9)

[0217] BR (butadiene rubber): BR150B manufactured by Ube Industries, Ltd. (cis content: 95% by mass, SP value: 8.4)

[0218] ENR25 (epoxidized natural rubber): ENR25 (epoxidized natural rubber having a degree of epoxidation of 25 mol %, SP value: 9) produced by Kumpulan Guthrie Berhad (Malaysia)

[0219] SBR: HPR340 produced by Nippon Synthetic Rubber Co., Ltd. (modified S-SBR, styrene binding amount: 10% by mass, Tg: -60°C; coupled with alkoxysilane and terminated, and a compound represented by formula (1) Modification; SP value: 8.1)

[0220] Silica: Ultrasil VN3 (N 2 SA: 175m 2 / g)

[0221] Silane coupling agent: Si69 (bis(3-triethoxysilylpropyl) tetrasulfide) produced by Degussa

[0222] Carbo...

Embodiment and comparative example 8

[0242] Of the mixed components shown in Table 1, the components shown in step 1 were kneaded for 4 minutes using a Banbury mixer so that the discharge temperature (Discharge temperature) was 150° C. (basic kneading step 1). Thereafter, the kneaded product obtained by the basic kneading step 1 and the components shown in step 2 were kneaded for 3 minutes using a Banbury internal mixer so that the discharge temperature was 150° C. (basic kneading step 2). In addition, in Examples 3 to 6 and Comparative Example 8, the kneaded material obtained in the basic kneading step 2 was kneaded for 3 minutes using a Banbury internal mixer so that the discharge temperature was 140° C. (the re-kneading step ). Subsequently, sulfur and a vulcanization accelerator were added to the kneaded product obtained by the basic kneading step 2 or the kneaded product obtained by the re-kneading step, and the obtained kneaded product was further kneaded for 3 minutes to discharge The temperature was 100°...

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Abstract

Provided is a pneumatic tire using a rubber composition which makes it possible to keep rolling resistance low, prevent the accumulation of static electricity during the running of the tire, suppress an increase over time in electrical resistance of the tire, and improve durability. The present invention relates to a rubber composition, including: a rubber component including two or more diene rubber; and carbon black having a nitrogen adsorption specific surface area of 400 m 2 / g or more in an amount of 5 to 30 parts by mass per 100 parts by mass of the rubber component, wherein the rubber composition has a degree of carbon black dispersion determined by counting agglomerates based on JIS K 6812 "Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes, fittings and compounds" of 90% or more.

Description

technical field [0001] The present invention relates to a rubber composition for tires, and a pneumatic tire using the composition. Background technique [0002] In recent years, compositions containing silica as a main component have been used especially in tread portions of tires for the purpose of reducing the rolling resistance of tires while maintaining wet grip performance. In this context, in order to further reduce the rolling resistance, it has also been considered to use silicon dioxide containing silica as the main reinforcing filler in other components such as breaker, sidewall, clinch and chafer parts. The composition of the agent replaces the conventional composition containing carbon black as the main reinforcing filler. [0003] However, if silica is used instead of carbon black in the tire component, this leads to a disadvantage that static electricity easily accumulates in the vehicle because silica is highly electrically insulating and tends to increase t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08L7/00C08L15/00C08L9/06C08K13/02C08K3/04C08K3/36B60C1/00
CPCY02T10/862C08L21/00B60C2001/0066B60C19/08B60C2001/0075B60C19/082B60C19/084B60C1/0025B60C19/088B60C19/086C08K3/04Y02T10/86Y10T152/10495Y10T152/1081Y10T152/10828
Inventor 服部高幸和田孝雄横山结香
Owner SUMITOMO RUBBER IND LTD
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