Rubber composition for tires, and pneumatic tire

A technology for a rubber composition and a tire, which is applied to the rubber composition for tires and the field of pneumatic tires, can solve the problems of high cohesion, low affinity between silica and rubber components, and cannot reduce rolling resistance wet performance, etc. Excellent low rolling resistance and excellent handling stability

CN106795337AActive Publication Date: 2017-05-31THE YOKOHAMA RUBBER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-31

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Abstract

The present invention addresses the problem of providing: a rubber composition for tires which, when made into a tire, exhibits excellent wet performance, excellent low rolling resistance, and excellent steering stability; and a pneumatic tire in which said rubber composition for tires is used. This rubber composition for tires includes: a diene-based rubber; silica; a silane coupling agent; a fatty acid metal salt; and a prescribed alkyl trialkoxysilane. The diene-based rubber includes at least 60 mass% of a modified conjugated diene-based rubber, and includes at least 30 mass% of a specific conjugated diene-based rubber corresponding to a portion or all of the modified conjugated diene-based rubber. The average glass transition temperature of the diene-based rubber is -45 to -20 DEG C. The specific conjugated diene-based rubber is produced using a specific production method, and has an aromatic vinyl unit content, a vinyl bond content, and a weight average molecular weight which are within prescribed ranges.
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Description

technical field

[0001] The present invention relates to a rubber composition for tires and a pneumatic tire. Background technique

[0002] In recent years, reduction in rolling resistance of tires has been demanded from the standpoint of low fuel consumption during vehicle running. In addition, improvement in wet performance (braking performance on a wet road surface) is required from the viewpoint of safety. In contrast, there is known a method of blending silica into a rubber component constituting a tread portion of a tire to achieve both low rolling resistance and wet performance.

[0003] However, there are following problems: the affinity between silica and rubber components is low, and in addition, the cohesiveness of silica is high, so even if only silica is blended in rubber components, silica is not dispersed and cannot The effect of reducing rolling resistance and the effect of improving wet performance can be sufficiently obtained.

[0004] In contrast, Patent...

Examples

Embodiment

[0192] Hereinafter, the present invention will be described in further detail through examples, but the present invention is not limited thereto.

[0193] [Preparation of modified conjugated diene rubber]

[0194]

[0195] Cyclohexane (35 g) and tetramethylethylenediamine (1.4 mmol) were added to a 100 mL ampoule purged with nitrogen, and n-butyllithium (4.3 mmol) was further added thereto. Next, isoprene (21.6 g) and styrene (3.1 g) were slowly added and reacted in an ampoule at 50° C. for 120 minutes to obtain a polymer block A having an active terminal. Regarding this polymer block A, the weight average molecular weight, molecular weight distribution, aromatic vinyl compound unit content, isoprene unit content, and 1,4-bonding content were measured. These measurement results are shown in Table 1.

[0196] Next, in an autoclave with a stirrer, under a nitrogen atmosphere, cyclohexane (4000 g), 1,3-butadiene (474.0 g) and styrene (126.0 g) were charged, and then the entir...