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However, if the content of antioxidants and waxes is increased for longer tire life, these components may migrate to the surface of the tire and spoil the appearance of the tire
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[0139] The present invention is specifically described with reference to the following examples, but is not limited to the following examples.
[0140] The chemicals used in the synthesis or polymerization are shown below. Purify chemicals by conventional methods if necessary.
[0141] n-Hexane: product of Kanto Chemical Co., Ltd.
[0142] Styrene: product of Kanto Chemical Co., Ltd.
[0143] Butadiene: 1,3-butadiene purchased from Tokyo Chemical Industry Co., Ltd.
[0144] THF: Tetrahydrofuran purchased from Kanto Chemical Co., Ltd.
[0160] Synthesis Example 1 (synthetic polymer (1): SBR with a degree of hydrogenation of 0 mol %)
[0161] Add 2,000 mL of n-hexane, 60 g of styrene, 140 g of butadiene, 2.5 g of THF, and 0.45 mmol of n-butyl lithium into a heat-resistant reaction vessel that has been fully purged with nitrogen, and then stir at 50°C for 5 hours to Polymerization occurs. After the reaction was terminated by adding ethanol, 1 g of 2,6-di-tert-butyl-p-cresol was added to the reaction solution. The resulting solution was purified by reprecipitation to obtain polymer (1). Polymer (1) had a weight average molecular weight (Mw) of 490,000, and its styrene content was 30% by mass.
[0162] Synthesis Example 2 (synthetic polymer (2): hydrogenated SBR with a hydrogenation degree of 60 mol %)
[0163] Polymer (2) was produced as described in Synthesis of Polymer (1) except that the resulting polymer was subjected to hydrogenation. Specifically, after the polymerizationconversion reaction in the syn...
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Abstract
Provided is a pneumatic tire showing balanced improvements in fuel economy, rubber tensile strength, abrasion resistance, tear performance, heat resistance, and ozone resistance. The present invention relates to a pneumatic tire formed from a rubber composition comprising a first polymer and a second polymer, the first polymer being a hydrogenated copolymer comprising a structure derived from an aromatic vinyl compound unit and a structural unit derived from a conjugated diene compound, and the degree of hydrogenation of the conjugated diene part is 75 mol% or more, the second polymer contains a double bond-containing diene content of 20 mass% or less, and the The second polymer has a weight average molecular weight of 200,000 to 2,000,000.
Description
technical field [0001] The present invention relates to a pneumatic tire formed from a specific rubber composition. Background technique [0002] With the recent increase in concern for environmental issues, the demand for fuel-efficient vehicles has been increasing. There is also a need for rubber compositions for more fuel-efficient automobile tires. For example, in automobile tires, a rubber composition containing a conjugated diene polymer such as polybutadiene or a butadiene-styrenecopolymer, and a filler such as carbon black or silica is used. [0003] For example, Patent Document 1 provides a method of improving fuel economy by using a diene rubber (modified rubber) that has been modified with an amino group- and alkoxy group-containing organosilicon compound. Although this conventional technique can improve fuel economy, it is also important to secure sufficient abrasion resistance and tensile properties (rubber tensile strength) from the standpoint of economics a...
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