Pneumatic tire

一种充气轮胎、氢化共聚物的技术，应用在特殊轮胎、轮胎零部件、运输和包装等方向，能够解决难以同时提高燃料经济性和耐磨性、燃料经济性相悖耐磨性等问题，达到良好燃料经济性、耐磨性和加工性均衡提高的效果

Active Publication Date: 2018-05-29
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this conventional technique is that wear resistance, which has a performance relationship contrary to fuel economy, is insufficient to solve the above-mentioned problems
Therefore, it is difficult to simultaneously improve fuel economy and wear resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0138] The present invention is specifically described with reference to but not limited to the following examples.

[0139] The chemicals used in the synthesis or polymerization are shown below. Chemicals were purified as necessary by conventional techniques.

[0140] n-Hexane: manufactured by Kanto Chemical Co., Ltd.

[0141] Styrene: a product manufactured by Kanto Chemical Co., Ltd.

[0142] Butadiene: 1,3-butadiene manufactured by Tokyo Chemical Industry Co., Ltd.

[0143] THF: Tetrahydrofuran manufactured by Kanto Chemical Co., Ltd.

[0144] TMEDA: N,N,N',N'-tetramethylethylenediamine manufactured by Kanto Chemical Co., Ltd.

[0145] n-butyllithium solution: 1.6M hexane solution of n-butyllithium manufactured by Kanto Chemical Co., Ltd.

[0146] Ethanol: a product manufactured by Kanto Chemical Co., Ltd.

[0147] 2,6-di-tert-butyl-p-cresol: Nucrac 200 manufactured by Ouchi Shinko Chemical Industry Co., Ltd.

[0148] Amine modifier: N,N-bis(trimethylsilyl)-aminopro...

Synthetic example 1

[0159] Synthesis Example 1 (Synthesis of SBR)

[0160] 2000 mL of n-hexane, 60 g of styrene, 140 g of butadiene, 2.5 g of THF and 0.45 mmol of n-butyllithium were added to a heat-resistant reaction vessel fully purged with nitrogen, followed by stirring at 50 °C for 5 h to induce polymerization. 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 the polymer (SBR).

Synthetic example 2

[0161] Synthesis Example 2 (Synthesis of Hydrogenated Copolymer 1)

[0162] A hydrogenated copolymer 1 was produced in the same manner as in Synthesis Example 1 except that the obtained polymer was hydrogenated. Specifically, after the polymerization conversion reaction in Synthesis Example 1, the polymerization reaction was not terminated by adding ethanol. Instead, the reaction solution was then stirred for 20 minutes while supplying hydrogen at a pressure of 0.4 MPa gauge to react unreacted polymer terminal lithium with hydrogen to form lithium hydride. Hydrogenation was carried out at a hydrogen supply pressure of 0.7 MPa gauge pressure and a reaction temperature of 90° C. using a titanocene-based dichloride catalyst. Once the cumulative amount of absorbed hydrogen reached an amount corresponding to the target degree of hydrogenation, the reaction temperature was returned to room temperature, and the hydrogen pressure was returned to normal pressure. Then, the reaction s...

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Abstract

The present invention provides a pneumatic tire that achieves a balanced improvement in fuel economy, abrasion resistance, and processability. A pneumatic tire formed from a rubber composition, the rubber composition containing a rubber component including a hydrogenated copolymer and a general purpose rubber, the hydrogenated copolymer containing a structural unit derived from an aromatic vinyl compound and a structural unit derived from a conjugated diene compound, the hydrogenated copolymer having a degree of hydrogenation of the conjugated diene portion of 30 to 100 mol %, a weight averagemolecular weight of 50,000 to 2,000,000, and a styrene content of 5% to 50% by mass, the general purpose rubber being at least one selected from the group consisting of natural rubber, polyisoprene rubber, styrene-butadiene rubber, and polybutadiene rubber, the rubber component including, based on 100% by mass thereof, 10% to 80% by mass of the hydrogenated copolymer.

Description

technical field [0001] The present invention relates to a pneumatic tire formed of a specific rubber composition. Background technique [0002] With the recent increase in concerns about environmental issues, the demand for fuel efficient vehicles is increasing. There is also a demand for rubber compositions for automobile tires having excellent fuel economy. For example, rubber compositions containing conjugated diene polymers such as polybutadiene or butadiene-styrene copolymers and fillers such as carbon black or silica are used in automobile tires. [0003] For example, Patent Document 1 proposes a technique for improving fuel economy by using a diene rubber (modified rubber) modified with an amino group- and alkoxy group-containing organosilicon compound. Although this conventional technology improves fuel economy, it is also important to ensure sufficient wear resistance from the viewpoints of economy and safety. This conventional technique has a problem in that wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08L9/06C08L9/00C08L91/06C08L91/00C08K13/02C08K3/04C08K3/36C08K5/09C08K3/22C08K3/06B60C1/00
CPCB60C1/0016B60C1/0025C08L9/06C08L15/00C08L2205/035C08K2003/2296C08L9/00C08L91/06C08L91/00C08K13/02C08K3/04C08K3/36C08K5/09C08K3/22C08K3/06B60C1/00C08K5/548C08K5/18C08K5/47C08K5/31C08L2205/025C08L2205/03
Inventor 山城裕平
Owner SUMITOMO RUBBER IND LTD
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