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Pneumatic tire

A technology of pneumatic tires and treads, which is applied to special tires, tire parts, tire treads/tread patterns, etc., which can solve problems such as no mention of grip performance, and achieve excellent handling stability and high-temperature grip excellent wear resistance and improved cutting and chipping resistance

Pending Publication Date: 2019-12-10
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent Document 1 proposes such a scheme: in order to improve the wet grip performance and wear resistance, etc., to the method of mixing fine particles of carbon black and the like to the modified natural rubber, but the grip performance on the high temperature road surface (high temperature grip property ) without any reference to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0164] Production example 1 (production of modified NR)

[0165] After adjusting the solid content concentration (DRC) of natural rubber latex (fresh latex obtained from Taitex Corporation) to 30% (w / v), 10 g of Emal-E and 20 g of NaOH were added to 1000 g of natural rubber latex, and it was carried out at room temperature for 48 hours. Saponification reaction to obtain saponified natural rubber latex. Water was added to this latex to dilute it until the DRC became 15% (w / v), then formic acid was added while stirring slowly, and the pH was adjusted to 4.0 to 4.5 to aggregate. The aggregated rubber was pulverized, washed twice with 1000 mL of water, and then dried at 110° C. for 2 hours to obtain a solid rubber (modified NR). With respect to the solid rubber (modified NR) obtained in Production Example 1 and the above-mentioned natural rubber, the nitrogen content, phosphorus content, and gel content were measured by the methods shown below. The results are shown in Table 1. ...

manufacture example 2

[0176] Production example 2 (production of modified SBR)

[0177] A stainless steel polymerization reactor with an internal volume of 30 liters and a stirring device was washed and dried, and the gas inside the polymerization reactor was replaced with dry nitrogen. Then, industrial hexane (density 680kg / m 3 ) 15.3kg, 912g of 1,3-butadiene, 288g of styrene, 9.1mL of tetrahydrofuran, and 6.4mL of ethylene glycol diethyl ether were put into the polymerization reactor.

[0178] Next, in order to detoxify in advance the deactivated impurities acting on the polymerization initiator, a small amount of hexane solution of n-butyllithium was put into the polymerization reactor as a scavenger. A n-hexane solution of n-butyllithium (19.2 mmol of n-butyllithium content) was charged into the polymerization reactor to initiate a polymerization reaction. Polymerization was carried out for 3 hours. During the polymerization reaction, the temperature in the polymerization reactor was adjuste...

Embodiment 1～6 and comparative example 1～5

[0180] According to the content of the formula shown in Table 2, in the formula material, the chemicals other than the vulcanizing agent and the vulcanization accelerator were mixed with a 1.7L Banbury internal mixer for 5 minutes until the discharge temperature reached 150°C to obtain a mixed things. Next, sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded for 5 minutes until the temperature reached 80° C. using a twin-screw mill to obtain an unvulcanized rubber composition.

[0181]

[0182] The obtained unvulcanized rubber composition was vulcanized at 170° C. for 10 minutes to produce a vulcanized rubber sheet.

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Abstract

The present invention provides a pneumatic tire having excellent high-temperature grip performance and abrasion resistance. The pneumatic tire is a tire having a tread composed of a predetermined rubber composition comprising a diene rubber comprising isoprene rubber, carbon black, silica, a compound comprising a predetermined bonding unit I and a bonding unit II, and a compound represented by a predetermined formula.

Description

technical field [0001] The present invention relates to a pneumatic tire, and more specifically, to a pneumatic tire provided with a tread composed of a predetermined rubber composition. Background technique [0002] Tires require grip performance on various road surfaces. Among them, in summer when the temperature is high, the temperature of the road surface increases, and the temperature of the tread during running also increases. Therefore, it is desired to improve the grip performance on the high-temperature road surface. However, as a general characteristic of rubber compositions, the hysteresis loss (tan δ) which greatly contributes to the grip performance tends to decrease as the temperature increases, so there is a problem that the grip performance is lowered. [0003] Hitherto, in order to increase the hysteresis loss in rubber compositions for treads, for the purpose of improving the grip performance on high-temperature roads, methods of changing the softener from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/06C08L9/00C08L83/08C08L15/00C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09C08K5/5398B60C1/00
CPCC08L7/00C08L15/00C08L9/06C08L9/00B60C1/0016C08K2201/011C08L2205/035C08K2003/2296C08L83/08C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09C08K5/5398C08C19/25C08K5/548C08K5/18C08K3/06C08K5/37C08K5/47C08L83/04C08K5/0091B60C11/0008C08L2205/025C08L2205/03
Inventor 前川哲哉田中健宏
Owner SUMITOMO RUBBER IND LTD
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