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Tread rubber composition and pneumatic tire

A rubber composition and tread technology, which is applied in the field of pneumatic tires and rubber compositions for treads, can solve the problems of tread damage, reduction of rubber rigidity, defects, etc., achieve high grip performance and reduce the occurrence of tire blowouts Effect

Active Publication Date: 2017-02-22
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a puncture occurs in the tread during a race, then the rigidity of the rubber is reduced so that the lap time is low, and further, the tread portion may even be damaged, chipped or separated
However, a technology that allows a high-softener-content composition in which a certain amount or more of a softener is mixed with a rubber component including a diene-based rubber to exhibit high grip performance while reducing explosiveness even during high-temperature running has not yet been established. birth

Method used

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  • Tread rubber composition and pneumatic tire
  • Tread rubber composition and pneumatic tire
  • Tread rubber composition and pneumatic tire

Examples

Experimental program
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Effect test

preparation example Construction

[0141] In the usual production methods, vulcanizing agents are introduced into the final kneading. However, it is preferable to introduce zinc dithiophosphate into the base kneading in order to improve its dispersibility in the rubber component to produce more uniform crosslinking.

[0142] After the basic kneading step, for example, a final kneading step (in which the prepared kneaded mixture 1 is mixed with a vulcanizing agent such as sulfur ), a vulcanization accelerator, etc.), followed by a vulcanization step (in the vulcanization step, the prepared kneaded mixture 2 (unvulcanized rubber composition) is heated and pressurized at 150° C. to 170° C. for 10 to 30 minutes), by This makes it possible to prepare the rubber composition of the present invention.

[0143] The rubber composition of the present invention is used for a tread of a pneumatic tire. In particular, the rubber composition may be suitable for use in cap treads (which form the outer surface layer of a mult...

Embodiment

[0148] The invention will be described in more detail with reference to non-limiting examples.

[0149] Chemicals used in Examples and Comparative Examples are listed below.

[0150]

[0151] TSR20

[0152]

[0153] Modified SBR1: a product prepared as follows (oil extender: 37.5 parts, styrene content: 41%, vinyl content: 40%, Tg: -29°C, weight average molecular weight: 1,190,000)

[0154] N9548: Product purchased from Japan Zeon Co., Ltd. (oil extender: 37.5 parts, styrene content: 35%, vinyl content: 18%, Tg: -40°C, weight average molecular weight: 1,090,000)

[0155] Modified SBR2: 0122 available from JSR Corporation (oil extender: 34 parts, styrene content: 36%, vinyl content: 18%, Tg: -44°C, weight average molecular weight: 945,000)

[0156] NS612: Product purchased from Japan Zeon Co., Ltd. (non-oil-extended, styrene content: 15%, vinyl content: 30%, Tg: -65°C, weight average molecular weight: 780,000)

[0157]

[0158] (1) Preparation of chain end modifiers

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Abstract

The present invention provides: a tread rubber composition having high grip performance, wear resistance, and tensile performance, in which the incidence of blowouts can be suppressed even during high-temperature travel in a high-softener formulation thereof in which at least a certain amount of a softener is blended with respect to a rubber component including a diene-based rubber; and a pneumatic tire having tread fabricated using the tread rubber composition. The present invention is a tread rubber composition including: a diene-based rubber including styrene butadiene rubber; at least one type of softener selected from the group consisting of a low-temperature plasticizer, a process oil, and a resin having a softening point of 160 DEG C or lower; zinc dithiophosphate; and sulfur; the content of the softener being 40 parts by mass or greater, the content of the zinc dithiophosphate being 0.2-15 parts by mass, and the content of zinc oxide being less than 2.5 parts by mass with respect to 100 parts by mass of the diene-based rubber.

Description

technical field [0001] The present invention relates to a rubber composition for treads and a pneumatic tire including a tread formed from the rubber composition for treads. Background technique [0002] The rubber composition used in the tread of a pneumatic tire is usually prepared by adding a filler (such as silicon dioxide or carbon black), a softener (such as a low-temperature plasticizer, process oil, or a compound with a softening point below 160° C. resin) is added to the rubber component including diene rubber. Further, sulfur and zinc oxide, and optional vulcanization accelerators (such as thiazole-based vulcanization accelerators (such as TBBS, CBS), thiuram-based vulcanization accelerators (such as TBZTD), or guanidine vulcanization accelerators are added thereto. (such as DPG), then they are kneaded and shaped, followed by crosslinking by heat and pressure in a vulcanizer to prepare a pneumatic tire. [0003] Pneumatic tires thus produced are required to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06B60C1/00C08K3/06C08K5/5398
CPCB60C1/00C08K3/06C08L9/06C08K3/04C08K3/32C08K3/36C08K5/47C08L9/00C08L15/00C08L57/02C08L61/06C08L91/00C08K2003/321C08K2003/2296C08K5/5398B60C1/0016C08K3/22C08K5/0016C08K2003/2227
Inventor 宫崎达也鹫头健介
Owner SUMITOMO RUBBER IND LTD
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