Tire

A tire and sidewall technology, applied in special tires, tire parts, tire sidewalls, etc., can solve the problem that the low loss effect of carbon black filler is not sufficient, and achieve the effect of improving durability

Active Publication Date: 2012-05-09
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the rubber composition using the modified polymer obtained by the above-mentioned production method, although the low-loss effect of the silica-based filler is greatly improved, the low-loss effect of the carbon black filler is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0152] In the above-described embodiment, the turbulent flow generating protrusion 10 is provided on the entire periphery of the side wall portion 3 , but the turbulent flow generating protrusion 10 may be provided only in a part of the side wall portion 3 .

[0153] In the above embodiment, the turbulent flow generating protrusions 10 are provided at equal intervals in the tire circumferential direction of the sidewall portion 3 , but the turbulent flow generating protrusions 10 may be provided at uneven intervals in the tire circumferential direction.

[0154] In addition, the angle of the direction of the turbulent flow generation protrusion 10 with respect to the radial direction may be constant. In a rotating pneumatic tire, since the flow velocity of the air flow varies according to the radial position, for the purpose of improving heat dissipation, The angle formed by the direction of the turbulence-generating protrusion 10 with respect to the radial direction may also b...

Embodiment

[0164] Next, the present invention will be described in more detail through examples, but the present invention is not limited by these examples.

[0165] In addition, the physical properties of the unmodified or modified conjugated diene polymer, carbon black, and unvulcanized rubber composition, and the run-flat durability and rolling resistance of the tire were measured by the following methods.

[0166] "Physical Properties of Unmodified or Modified Conjugated Diene Polymers"

[0167]

[0168] It is measured by GPC [manufactured by Tosoh Corporation, HLC-8220] using a refractometer as a detector, and is expressed in terms of polystyrene with monodisperse polystyrene as a standard. In addition, the column was GMHXL [manufactured by Tosoh Corporation], and the eluent was tetrahydrofuran.

[0169]

[0170] Treat the sample with a siloxane hydrolysis reagent formed from 0.2N toluenesulfonic acid / 0.24N water in a solvent containing 15% by mass n-butanol and 85% by mass tol...

manufacture example 1

[0191] Production Example 1: Production of Polymer A

[0192] In a nitrogen-purged 5 L autoclave, under nitrogen, 1.4 kg of cyclohexane, 250 g of 1,3-butadiene, 2,2-bis(tetrahydrofuryl)propane (0.0285 mmol) were injected as a cyclohexane solution, 2.85 mmol of n-butyllithium (BuLi) was added thereto, and then polymerization was performed for 4.5 hours in a 50° C. warm water bath provided with a stirring device. The reaction conversion of 1,3-butadiene was substantially 100%. Add 1.3g of 2,6-di-tert-butyl-p-cresol methanol solution to the polymer solution to stop the polymerization, then remove the solvent by stripping, and dry with a roll at 110°C to obtain polymer A (co- conjugated diene polymers). The molecular weight (Mw) and molecular weight distribution (Mw / Mn) of the polymer taken out before the termination of the polymerization of the obtained polymer A were measured. The results are shown in Table 1 and Table 2.

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Abstract

Disclosed is a pneumatic tire, in which turbulent flow-creating ridges extending from the inner circumference side to the outer circumference side are formed at intervals in the tire circumference direction on the tire surface of a tire side part, wherein: said turbulent flow-creating ridges have edge parts, as viewed in the sectional shape cut in the radial direction; the front wall angle, which is made between the front wall faces of the turbulent flow creating ridges to be hit by an air flow and the tire surface, ranges from 70o to 110o; and, as a side-reinforcing rubber constituting said tire side part, a rubber composition prepared by blending 100 parts by mass of a rubber component containing 10 mass% or more of a modified conjugated diene polymer, which is obtained by conducting a modification reaction between a terminus of a conjugated diene polymer and an alkoxysilane compound having a primary amino group or a precursor capable of forming a primary amino group through hydrolysis to thereby introduce the primary amino group or the precursor capable of forming a primary amino group through hydrolysis to said terminus, and further adding a fusion accelerator to the modification reaction system in the course of the modification reaction or after the completion thereof, with 10 to 100 parts by mass of carbon black having a nitrogen adsorption specific surface area of 20 to 90 m2 / g. Thus, it is possible to provide a durability-improvable tire, in which the temperature inside the tire side part can be lowered due to efficient heat radiation, and the durability during run-flat traveling and the rolling resistance during normal traveling, as the rubber composition, can be simultaneously improved.

Description

technical field [0001] The present invention relates to a tire, and more particularly to a tire capable of reducing the temperature of a sidewall portion having a sidewall reinforcing layer that is likely to deteriorate and having excellent run-flat performance. Background technique [0002] An increase in temperature of a pneumatic tire promotes time-dependent changes such as changes in material properties and causes tread damage during high-speed driving, which is not preferable from the viewpoint of durability. In particular, in off-the-road radial (ORR, off-the-roadradial) tires used under heavy loads, truck and bus radial (TBR) tires, or run-flat tires when the tire bursts (when the internal pressure is 0kPa), In order to improve durability, reducing tire temperature has become a major issue. For example, in a run-flat tire with a crescent-shaped reinforcing rubber, the radial deformation concentrates on the reinforcing rubber when the tire bursts and runs, and this pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00B60C13/00B60C17/00C08C19/22C08K3/04C08K3/06C08L15/00
CPCB60C13/02B60C1/0025C08C19/44C08K3/04Y02T10/86C08L15/00
Inventor 松尾成晃山口正志
Owner BRIDGESTONE CORP
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