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Tire rubber composition and pneumatic tire

A rubber composition, rubber technology, applied in special tires, tire parts, transportation and packaging, etc., can solve problems such as the decline of kneading ability, and achieve the effect of good kneading ability

Active Publication Date: 2014-12-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the modified styrene-butadiene rubber for use in combination with silica is used in a large amount, the kneading ability disadvantageously decreases

Method used

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  • Tire rubber composition and pneumatic tire
  • Tire rubber composition and pneumatic tire
  • Tire rubber composition and pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～4

[0093] According to each formulation shown in Table 1, raw materials other than sulfur and a vulcanization accelerator were charged into a 1.7 L Banbury mixer and kneaded at 150° C. for 5 minutes to provide kneaded materials. Sulfur and a vulcanization accelerator were kneaded into the obtained kneaded mixture at 80° C. using an open two-roll mill for 5 minutes. Thus an unvulcanized rubber composition was prepared. A rubber sheet is formed from the prepared unvulcanized rubber composition. This rubber sheet was vulcanized under pressure at 150°C and 25 kgf for 5 minutes to prepare a vulcanized rubber composition.

[0094] In addition, the prepared unvulcanized rubber composition is molded into a tread shape and combined with other tire components to form an unvulcanized tire. The unvulcanized tire was vulcanized at 150° C. for 35 minutes to prepare a test tire (tire size: 175 / 65R15).

[0095] The unvulcanized rubber composition, vulcanized rubber composition, and test tire ...

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Abstract

The present invention aims to provide a tire rubber composition that achieves a good balance of grip performance (especially, wet grip performance), abrasion resistance, cut and chip resistance, low rolling resistance, and kneadability, and a pneumatic tire using the same. The composition comprise: a rubber component including a styrene-butadiene rubber modified by a compound of formula (1) : and a non-modified styrene-butadiene rubber; a filler including silica, the filler being in an amount of 80 parts by mass or less per 100 parts by mass of the rubber component; and sulfur in an amount of 0.5-1.5 parts by mass per 100 parts by mass of the rubber component, the modified styrene-butadiene rubber having a bound styrene content of 20-40% by mass and a vinyl content of 30-65% by mass, and the non-modified styrene-butadiene rubber having a bound styrene content of 25-45% by mass and a vinyl content of 10-50% by mass.

Description

technical field [0001] The present invention relates to a rubber composition for tires and a pneumatic tire produced using the rubber composition. Background technique [0002] For global environmental protection, people are developing a high fuel economy car. This situation has led to the need for automotive tires with low rolling resistance. [0003] The rolling resistance of a tire is mainly caused by the energy loss caused by the repeated deformation of the rubber during driving. In order to reduce rolling resistance, for example, a tire having a structure in which a tread portion exhibiting the highest rolling resistance contributing ratio (about 34%) is composed of two layers of rubber has been proposed; an inner rubber layer ( base tread) is made of rubber with low energy loss, and the outer rubber layer (cap tread) is made of rubber with excellent wear resistance (Patent Document 1). In this case, however, there is still room for improvement in reducing rolling re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L15/00C08L9/06C08K3/36C08K3/06C08L7/00B60C1/00
CPCC08K3/36C08K5/548C08L7/00B60C1/0016C08L15/00C08C19/25C08L9/06C08C19/44C08L9/00Y02T10/86C08L2666/08C08L2666/02C08K3/06C08L2205/02
Inventor 近藤俊一
Owner SUMITOMO RUBBER IND LTD
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