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Tire having structure of tire tread including cap tread and base tread

A driving surface and tread technology, applied in the direction of tire tread/tread pattern, special tires, tire parts, etc., can solve the problems of rising proportion of non-petroleum resources and declining grip performance.

Inactive Publication Date: 2012-07-18
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when silica is mixed, although the rolling resistance can be reduced, there is a problem that the grip performance is reduced.
[0006] Japanese Patent Application Laid-Open No. 2003-63206 discloses an eco-friendly tire (エコタイヤヤ), which increases the proportion of non-petroleum resources in the tire by having a tread using specified non-petroleum resources. Compared with tires mainly composed of raw materials derived from petroleum resources, it is not inferior, but the rolling resistance characteristics, driving stability and rubber strength are not all improved while maintaining a good balance, and there is still room for improvement

Method used

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  • Tire having structure of tire tread including cap tread and base tread
  • Tire having structure of tire tread including cap tread and base tread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～5

[0062] (Production of vulcanized rubber composition)

[0063] According to the formulation shown in Table 1, using a Banbury internal mixer, under the condition of 130° C., the chemicals except sulfur and vulcanization accelerator were mixed for 2 minutes to obtain a mixed product. Next, sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded at 90° C. for 1.5 minutes using an open mill to prepare an unvulcanized rubber composition. Then, the obtained unvulcanized rubber composition was vulcanized on a flat plate at 170°C for 12 minutes to obtain rubber compositions for base treads (represented as bases in Table 1) B1 to B5 and rubber compositions for cap treads ( In Table 1, it is represented as running surface) C.

[0064] (Preparation of rubber sheet for vulcanization test)

[0065] Using a thickness meter, the ratio of the thickness of the cap tread to the total thickness of the tread (expressed as cap ratio (%) in Table 2) and the ...

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Abstract

The present invention provides a tire having a tire tread comprising a cap tread and a base tread, use of which makes it possible to prepare for future decrease of petroleum supply, and further, can improve rolling resistance, steering stability and rubber strength in favorable balance, as compared with a tire prepared by using a rubber composition for a tread or a tire prepared by using a rubbercomposition for a base tread, which mainly comprises materials derived from petroleum resources. The tire has a tire tread comprising a cap tread and a base tread, the base tread being prepared by using a rubber composition for a base tread comprising 25 to 80 parts by weight of silica on the basis of 100 parts by weight of a rubber component comprising a natural rubber, and a thickness of the base tread being 17 to 50% of the overall thickness of the tire tread.

Description

technical field [0001] The present invention relates to a tire having a tread structure comprising a cap tread and a base tread. Background technique [0002] In recent years, tires have been required to have various characteristics such as driving stability, abrasion resistance, ride comfort, etc. in addition to low combustion properties, and various efforts have been made to improve these performances. Among these performances, in particular, the grip performance and rolling resistance characteristics (low fuel consumption) of tires are characteristics related to hysteresis loss of rubber. Generally, if the hysteresis loss is increased, the grip becomes higher and the braking performance improves, but the rolling resistance also increases, leading to an increase in fuel consumption. Thus, since grip performance and rolling resistance characteristics are in an inverse relationship, various rubber compositions for treads have been proposed in order to simultaneously satisfy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L7/00B60C1/00B60C11/00C08K3/36
CPCC08L15/00B60C11/005C08K3/36B60C11/00Y02T10/862C08L7/00B60C1/0016C08C19/06Y02T10/86C08L2666/08
Inventor 平山智朗
Owner SUMITOMO RUBBER IND LTD
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