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Rubber composition for side rubber and pneumatic radial tire for heavy load using the same

A technology of rubber composition and sidewall rubber, which is applied to the sidewall of the tire, special tires, tire parts, etc., can solve the problems of increased rubber shrinkage, unstable properties, and deterioration of the wear resistance of the sidewall rubber. To achieve the effect of reducing rolling resistance

Inactive Publication Date: 2009-08-26
BRIDGESTONE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when the compounding amount of the filler is reduced or low-grade carbon black is compounded, there are problems in that the wear resistance (resistance to curb wear) of the sidewall rubber deteriorates, and the shrinkage of the rubber becomes large during tire processing. destabilize, etc.

Method used

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  • Rubber composition for side rubber and pneumatic radial tire for heavy load using the same
  • Rubber composition for side rubber and pneumatic radial tire for heavy load using the same
  • Rubber composition for side rubber and pneumatic radial tire for heavy load using the same

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Embodiment Construction

[0017] The present invention will be described in detail below. The rubber composition for a sidewall rubber according to the present invention includes 35 to 55 parts by mass of a filler containing at least carbon black having a grade of not lower than FEF, based on 100 parts by mass of at least one of natural rubber and synthetic polyisoprene rubber. A rubber component composed of one and the other synthetic diene-based rubber, wherein the amount of carbon black compounded with a grade not lower than FEF is 15 to 55 parts by mass, the total compounding of tan δ at 25°C and filler The amount satisfies the relationship of the above formula (I).

[0018] To improve the durability and processability of the sidewall rubber, it is generally effective to increase the total amount of fillers such as carbon black, silica, and the like. On the other hand, in order to reduce the rolling resistance, it is effective to reduce the hysteresis loss (tan δ) of the side rubber. Based on the...

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Abstract

The invention discloses a rubber composition for side rubbers, which has good workability and reduced hysteresis loss without decreasing durability of side rubbers. Specifically disclosed is a rubber composition for side rubbers, which is obtained by blending 35-55 parts by mass of a filler containing a carbon black of at least FEF-grade per 100 parts by mass of a rubber component which is composed of at least one of a natural rubber and a synthetic polyisoprene rubber, and another synthetic diene rubber. This rubber composition for side rubbers is characterized in that the blending amount of the carbon black of at least FEF-grade is 15-55 parts by mass, and tan delta and the total blending amount of the filler at 25 DEG C satisfy the following formula (I). tan delta / (total blending amount of filler) = 0.0025 (I).

Description

technical field [0001] The present invention relates to a rubber composition for a sidewall rubber and a heavy-duty pneumatic radial tire using the rubber composition in a sidewall, and more particularly, the present invention relates to a rubber composition for a sidewall of a heavy-duty pneumatic radial tire, which has Good processability and capable of reducing rolling resistance throughout running without deteriorating the durability of the sidewall portion of the heavy-duty pneumatic radial tire. Background technique [0002] Hitherto, in order to reduce the rolling resistance of a radial tire, the hysteresis loss of the tread rubber in the tire is generally reduced. However, this effect diminishes as the tire wears, and thus the tread rubber disappears. Therefore, by reducing the hysteresis loss of the tread rubber, the initial rolling resistance of the tire can be reduced, but the rolling resistance of the tire at the end of running cannot be reduced. [0003] On th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/00B60C1/00B60C13/00C08K3/04
CPCC08F253/00C08L7/00C08K3/04C08L51/04C08L21/00C08L9/00B60C1/0025C08L15/00C08F279/02C08C19/44C08L2205/02Y02T10/86C08L2666/08C08L2666/24C08L2666/02
Inventor 大原真史
Owner BRIDGESTONE CORP
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