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Pneumatic tire

A technology for pneumatic tires and treads, which is applied to special tires, tire parts, transportation and packaging, etc. It can solve the problems of not necessarily obtaining modification effects and reduced productivity, and achieves excellent processability and enhanced low heat generation. Effect

Inactive Publication Date: 2012-05-16
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction of silica with silane coupling agent can be accomplished by increasing the number of kneading stages in the kneading step, but this leads to a decrease in productivity in the kneading step
However, satisfactory modification effects are not necessarily obtained in rubber compositions blended with silica and carbon black

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0131] The present invention will be explained in further detail below with reference to Examples and Comparative Examples, but the present invention should by no means be limited to the following Examples.

[0132] In the following examples and comparative examples, the physical properties of precipitated silica and the rolling resistance and abrasion resistance of tires were measured and evaluated by the following methods.

[0133] Physical Properties of Precipitated Silica

[0134] (1) Acoustic measurement of particle size distribution diameter:

[0135] A 0.01 M KCl aqueous solution of each precipitated silica was subjected to dispersion treatment by ultrasonic waves for 5 minutes to remove air bubbles, and then the primary aggregate diameter of the precipitated silica was measured with a particle size distribution ultrasonic measuring device DT1200 (manufactured by Dispersion Technology, Inc.) (nm) mode value A ac .

[0136] (2) Measurement of CTAB:

[0137]CTAB was m...

Synthetic example 1

[0172] A 0.5 liter separable flask equipped with a nitrogen inlet, a thermometer, a Dimroth condenser and a dropping funnel was charged with 80 g of ethanol, 5.46 g (0.07 mol) of anhydrous sodium sulfide and 2.24 g (0.07 mol) of sulfur, and the solution was heated to 80°C. While stirring the above solution, 33.7 g (0.14 moles) of propyltriethoxychlorosilane ((CH 3 CH 2 O) 3 Si-(CH 2 ) 3 -Cl) and 10.8 g (0.07 mol) of 1,6-dichlorohexane (ClCH 2 -(CH 2 ) 4 -CH 2 Cl). After completion of the dropwise addition, the solution was stirred at 80° C. for 10 hours. After the stirring was completed, the solution was cooled to separate the salts generated by filtration, and then the ethanol of the solvent was removed by distillation under reduced pressure.

[0173] The solution thus obtained was subjected to infrared absorption spectroscopic analysis (IR analysis), 1 H NMR spectrum analysis ( 1 H-NMR analysis) and supercritical chromatographic analysis, as a result, it is confi...

Synthetic example 2

[0175] In addition to using 14.77 g (0.07 moles) of 1,10-dichlorodecane (ClCH 2 -(CH 2 ) 8 -CH 2 Cl) was synthesized in the same manner as in Synthesis Example 1 except that 1,6-dichlorohexane in Synthesis Example 1 was replaced.

[0176] The solution thus obtained was subjected to IR analysis, 1 H-NMR analysis and supercritical chromatographic analysis, as a result, confirmed that obtained by the average composition formula (CH 3 CH 2 O) 3 Si-(CH 2 ) 3 -S-S-(CH 2 ) 10 -S-S-(CH 2 ) 3 -Si(OCH 2 CH 3 ) 3 indicated compound. That is, in the average composition formula (VI), R 1 is ethyl; R 3 is n-propyl; R 4 for S-(CH 2 ) 10 -S (corresponding to formula (VII), wherein R e for (CH 2 ) 10 ); p=0 and q=1. The above compound had a purity of 84.2% as measured by GPC analysis.

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Abstract

A pneumatic tire using a rubber composition, comprising: per 100 parts by mass of a rubber component comprising at least one kind of natural rubber or diene-based synthetic rubber, 20-150 parts by mass of hydrous silicic acid employed as a filler, wherein the specific surface area determined based on the adsorption of cetyltrimethylammonium bromide (CTAB) (m2 / g) and the modal diameter (nm) of primary aggregates determined by the acoustic particle size distribution analysis (Aac) satisfy relationship (A), and the difference between the ignition loss (loss in mass% through 3-hour heating at 750 DEG C) and the heating loss (loss in mass% through 2-hour heating at 105 DEG C) satisfies relationship (B); and 1-25 parts by mass of at least one kind of specific sulfur-containing silane compound as a silane coupling agent. -0.76x(CTAB)+274 (A) (ignition loss)-(heating loss) is not greater than Aac and is not less than 3 (B).

Description

technical field [0001] The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire produced by using a rubber composition using precipitated silica having a specific structure as a reinforcing filler and a specific silane coupling agent, and The rubber composition is low in heat build-up and excellent in abrasion resistance. Background technique [0002] In recent years, along with society's demand for energy saving and increased attention to environmental issues, the demand for low fuel consumption has become more severe in connection with the movement of global carbon dioxide emission control. In order to meet the above-mentioned requirements, tires with reduced rolling resistance and low heat build-up have been demanded as tire properties. Although a method of optimizing a tire structure has been studied so far as a method of reducing tire rolling resistance, it is practiced as the most common method of using a material showing lower heat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/00C08K3/34C08K5/548B60C1/00
CPCC08K5/548C08K3/36C08L9/06C08L7/00B60C1/0016C08L21/00C08K9/06C08K3/04C08L2666/08
Inventor 佐坂尚博
Owner BRIDGESTONE CORP
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