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Rubber composition for bead apex and pneumatic tire

A technology of rubber composition and bead apex, applied in special tires, tire parts, rolling resistance optimization, etc., can solve the problems of thermal reduction of hardness, destruction of resin cross-linking structure, reduction of resin cross-linking operation stability, etc.

Inactive Publication Date: 2012-10-17
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, resin crosslinking has a problem of reduced handling stability due to heat generated by repeated strain during running that lowers hardness and destroys the resin crosslinked structure

Method used

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  • Rubber composition for bead apex and pneumatic tire
  • Rubber composition for bead apex and pneumatic tire
  • Rubber composition for bead apex and pneumatic tire

Examples

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Effect test

Embodiment

[0082] The present invention will be described in more detail based on examples, but the scope of the present invention is not limited to these examples.

[0083] Various chemical reagents used in Examples and Comparative Examples are shown below.

[0084] NR: TSR20.

[0085] BR: VCR617 (BR with SPB; ML 1+4 (100° C.): 62; boiling n-hexane insoluble matter content: 17% by mass), manufactured by Ube Industries, Ltd.

[0086] SBR: Emulsion polymerization SBR (E-SBR) 1502 (styrene content: 23.5 mass %), manufactured by JSR Corporation.

[0087] Carbon Black: See Table 1.

[0088] Silica: Z115Gr, manufactured by Rhodia Corporation.

[0089] Alkylphenol resin: SP1068 (non-reactive alkylphenol resin represented by the above general formula (4), wherein m is an integer from 1 to 10, R 4 octyl), manufactured by NIPPON SHOKUBAI.

[0090] TDAE oil: Vivatec 500, manufactured by H&R Company.

[0091] Antioxidant: Nocrac 6C (6PPD), manufactured by Ouchi Shinko Chemical Industry Co., ...

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Abstract

Provided is a rubber composition for a bead apex and a pneumatic tire which can provide good handling stability and enable suppression of reduction of this performance. The rubber composition for a bead apex includes a rubber component; a carbon black; zinc oxide; and an alkylphenol-sulfur chloride condensate, wherein the carbon black has a COAN of 75 to 130 ml / 100 g and a BET specific surface area of 25 to 50 m2 / g, and an amount of the carbon black is 55 to 80 parts by mass and an amount of the zinc oxide is 7 to 12 parts by mass, per 100 parts by mass of the rubber component.

Description

technical field [0001] The present invention relates to a rubber composition for a bead apex and a pneumatic tire using the same. Background technique [0002] In recent years, tires for passenger cars and motorcycles whose performance has been improved are expected to be able to run safely at high speeds. In order to realize this performance, high steering stability is required. [0003] One known method of improving handling stability is a method of increasing the rubber hardness of the bead apex. It is known that rubber hardness is increased by resin crosslinking. However, resin crosslinking has a problem of lowering steering stability because heat generated by repeated strain during running reduces hardness and destroys the resin crosslinking structure. [0004] Patent Document 1 teaches the use of (modified) phenolic resins, non-reactive phenolic resins, and carbon black; however, further improvement in performance stability (reproducibility) is desired in considerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00C08L7/00C08L61/06C08L61/14C08K3/04C08K3/22B60C1/00
CPCC08L7/00Y02T10/862C08K5/13B60C1/00B60C2001/0058C08L9/00C08K3/04C08K5/375C08L21/00
Inventor 宫崎达也
Owner SUMITOMO RUBBER IND LTD
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