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Rubber composition for sidewall

A rubber composition and tire technology, applied in the direction of tire sidewalls, special tires, tire parts, etc., can solve the problems of unfavorable environmental ecological protection, deterioration of flex crack growth resistance and reinforcement, and reduction of rolling resistance.

Inactive Publication Date: 2007-06-27
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that some properties such as resistance to flex crack growth and reinforcement deteriorate significantly when resources other than petroleum are used compared to the case of using petroleum resources
[0004] JP-A-2003-113270 discloses a rubber composition for tire sidewalls, in which specific carbon black and calcium carbonate are mixed into specific rubber components so as not to degrade fading resistance and ozone resistance Reduce rolling resistance, and disclose a kind of pneumatic tire that uses this rubber composition, but because contain a large amount of synthetic rubbers and carbon black in the rubber composition, therefore, except being unfavorable for environmental ecological protection, its tear strength and resistance Flex crack growth is also not improved

Method used

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Examples

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Embodiment

[0030] The present invention will be described in detail based on embodiments, but the present invention is not limited to this.

[0031] The chemicals used in the Examples and Comparative Examples are collectively described as follows:

[0032] Natural Rubber (NR): TSR20

[0033] Butadiene Rubber (BR): BR150B, purchased from Ube Industrial Co., Ltd.

[0034] Epoxy natural rubber 1 (ENR1): ENR25 (epoxy rate: 25 mol%), purchased from Kumpulan Guthrie Berhad

[0035] Epoxy natural rubber 2 (ENR2): ENR50 (epoxy rate: 50 mol%), purchased from Kumpulan Guthrie Berhad

[0036] Carbon black: DIABLACK E (N 2 SA: 41m 2 / g), purchased from Mitsubishi Chemical Company

[0037] Silica: Ultrasil VN3 (BET: 170m 2 / g), purchased from Degussa

[0038] Silane coupling agent: Si75 (bis(triethoxysilylpropyl) disulfide (TESPD)), purchased from Degussa

[0039] Aromatic oil: PROCESS X-140, purchased from Japan Energy Corporation

[0040] Petroleum resin: SP1068 resin, purchased from Nippon Shokubai Co.,...

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Abstract

A rubber composition for a sidewall, which is ecological, and provided for future decrease of petroleum amount supplied, and further, maintains hardness, and is excellent in crack resistance and flex crack resistance performance can be provided by increasing an amount of resources other than petroleum. A rubber composition for a sidewall, comprising 0.1 to 10 parts by weight of zinc oxide having an average particle size of at most 200 nm based on 100 parts by weight of a rubber component comprising at least 30% by weight of a natural rubber and at most 70% by weight of an epoxidized natural rubber.

Description

Technical field [0001] The present invention relates to a rubber composition for tire sidewalls. Background technique [0002] Generally, in the rubber composition for tire sidewalls, in addition to blending natural rubber (NR) to exhibit excellent tear strength, butadiene rubber (BR) can also be blended to improve flex crack growth resistance, and further Carbon black is used to improve weather resistance and reinforcement. [0003] However, environmental issues have recently received attention, and restrictions on CO have been strengthened. 2 Emission regulations, and further considering that the limited petroleum resources and their supply are declining every year, it can be predicted that the price of petroleum will rise in the future, and the use of petroleum-derived materials such as BR and carbon black will be restricted. Therefore, it is envisaged that in the future when oil is exhausted, resources other than oil such as white fillers such as NR, silica and calcium carbon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K3/36B60C1/00B60C13/00
CPCY02T10/862C08K3/22C08L21/00
Inventor 上坂宪市和田孝雄内田守
Owner SUMITOMO RUBBER IND LTD
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