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Natural rubber, rubber composition comprising natural rubber and method for producing same, and tire

A technology of natural rubber, production method, applied in the direction of special tires, tire parts, transportation and packaging, etc., to achieve the effect of suppressing the deterioration of processability, excellent physical properties, excellent fracture resistance and wear resistance

Active Publication Date: 2015-03-18
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above measurement methods include the problem that ultra-high molecular weight polymers contained in natural rubber and diene-based synthetic rubber are trapped by filters such as filters and are not measured

Method used

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  • Natural rubber, rubber composition comprising natural rubber and method for producing same, and tire
  • Natural rubber, rubber composition comprising natural rubber and method for producing same, and tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] 2000 g of field latex containing 600 g of solid matter was put into a reaction vessel made of stainless steel equipped with a stirrer and a temperature control jacket, and was previously added by dissolving 100 mg of emulsifier Emulgen 1108 manufactured by Kao Corporation in 20 ml of water to An emulsion prepared from 3.0 g of divinylbenzene was added to the field latex along with 280 ml of water. The above mixture was stirred at room temperature for 30 minutes while removing oxygen by bubbling nitrogen.

[0105] Next, 1.0 g of t-butyl hydroperoxide t-BHPO as a polymerization initiator and 1.0 g of tetraethylenepentamine TEPA as an emulsion stabilizer were added thereto to react them at 40° C. for 1 hour, thereby obtaining a polymerized natural latex.

[0106] Formic acid was added to the natural latex thus obtained to control its pH to 4.7, thereby coagulating the natural latex. The solid matter thus obtained was treated 5 times with a spatula, then passed through a ...

Embodiment 2

[0109] Production was carried out under the same conditions except that 14.4 g of divinylbenzene was added instead of 3.0 g of divinylbenzene in Example 1, whereby natural rubber B was obtained. According to the compositions shown in Table 1 above, rubber compositions were obtained.

Embodiment 3

[0111] Production was performed under the same conditions except that 12.0 g of divinylbenzene was added instead of 3.0 g of divinylbenzene in Example 1, whereby natural rubber C was obtained. According to the compositions shown in Table 1 above, rubber compositions were obtained.

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PUM

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Abstract

Provided are a natural rubber which maintains processability and is excellent in a breaking resistance and a wear resistance, a rubber composition containing the above natural rubber, and a tire prepared by using the same. The natural rubber of the present invention is obtained by gelatinizing or multi-coupling a natural rubber latex or a natural rubber and comprises 15 % by mass or more of a high molecular weight component, P1, having a molecular weight of 5,000,000 to 50,000,000 and 40 % by mass or less of an ultrahigh molecular weight component, P2, having a molecular weight of exceeding 50,000,000, and the relation between mass% of P1 and mass% of P2 is 1.5 × mass% of P1 ‰¥ mass% of P2, each measured by the following measuring method, wherein a measuring method for a rubber molecular weight is measured by means of a field flow fractionation equipment with a multi-angle light scattering detector for a soluble part of a centrifuged rubber solution at a centrifugal acceleration of 10,000 to 1,000,000 G.

Description

technical field [0001] The present invention relates to a natural rubber, a rubber composition containing the natural rubber, and a tire, in particular to a natural rubber having excellent fracture resistance, a rubber composition containing the natural rubber, and a tire. Background technique [0002] Natural rubber is frequently used in many fields, including industrial products such as tires, rubber belts, rubber rollers, air bags (praders), and fenders, and sporting goods such as tennis balls, basketballs, soccer balls, and volleyballs. In recent years, natural rubber has also been frequently used in the medical field and the biological field. In the case of tires in particular, natural rubber is used as a material for many components constituting rubber tires such as treads, sidewalls, ply covers and bead fillers. [0003] When natural rubber is used for the above-mentioned products such as tires, the natural rubber used therefor is required to be improved especially i...

Claims

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Application Information

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IPC IPC(8): C08L7/00B60C1/00C08L7/02
CPCB60C1/0025B60C1/0016C08L7/02C08L7/00C08L2205/025B60C1/00C08F253/00C08K5/03C08K5/20C08K5/24C08K5/37C08L2312/00C08L51/04C08F212/36C08F222/14C08F222/38
Inventor 土田和孝米元真希子
Owner BRIDGESTONE CORP
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