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Rubber composition for clinch apex and pneumatic tire with clinch apex utilizing the same

A rubber composition and rubber strip technology, which is applied to tire parts, bead, transportation and packaging, etc., can solve problems such as increased mixing process, difficult processing, edge cracking, etc.

Inactive Publication Date: 2009-09-02
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, these rubber compositions have problems in that they are very difficult to process in a tire manufacturing plant, and have to add a kneading process to the mixing process, or cause edge cracks in the extrusion process.
However, there is still room for improvement to reduce the deviation of the metal rim and the spigot reinforcement strip of the tire, and to suppress the abrasion between the spigot reinforcement strip and the rim

Method used

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  • Rubber composition for clinch apex and pneumatic tire with clinch apex utilizing the same
  • Rubber composition for clinch apex and pneumatic tire with clinch apex utilizing the same
  • Rubber composition for clinch apex and pneumatic tire with clinch apex utilizing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1～4

[0058] According to the formulations shown in Table 1 and Table 2, the chemical reagents except the insoluble sulfur and the vulcanization accelerator were kneaded for 4 minutes using a Banbury internal mixer under the condition of 160° C. to obtain a kneaded product. Next, insoluble sulfur and a vulcanization accelerator were added to the obtained kneaded product, and kneaded at 100° C. for 5 minutes using an open mill to obtain an unvulcanized rubber composition. Then, under the condition of 170° C., the obtained unvulcanized rubber composition was vulcanized on a plate for 15 minutes to obtain the vulcanized rubber compositions of Examples 1-3 and Comparative Examples 1-4.

[0059] (Mooney viscosity)

[0060] Using the above-mentioned unvulcanized rubber composition, according to JIS K 6300 "Unvulcanized rubber-Physical properties-Part 1: Determination of viscosity and scorch time from Mooney viscosity", using a Mooney viscosity tester, after 1 minute Preheating and heatin...

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Abstract

There is provided the rubber composition for a clinch apex keeping hardness constant, suppressing prevulcanization, reducing rolling resistance, improving processability, suppressing generation of chafing between the clinch apex and a rim and hardly causing slipping of the clinch apex on the rim. The rubber composition for a clinch apex comprises 55 to 75 parts by weight of carbon black and 1 to 5 parts by weight of para-benzoquinolinediimine based on 100 parts by weight of a rubber component comprising 10 to 50 % by weight of a natural rubber and / or an isoprene rubber and 50 to 90 % by weight of a butadiene rubber having a Mooney viscosity at 100 DEG C of 30 to 55 in an unvulcanized state, and the pneumatic tire has the clinch apex using the rubber composition.

Description

technical field [0001] The present invention relates to a rubber composition for a clinch reinforcing strip and a pneumatic tire having a clinch reinforcing strip using the composition. Background technique [0002] The spigot reinforcing strip of a pneumatic tire is a member that is in contact with the rim and rubs against the rim and is prone to wear. Therefore, conventionally, a large amount of butadiene rubber (BR) has been mixed into the spigot reinforcement strip in order to suppress the wear caused by the friction between the slit reinforcement strip and the rim. [0003] In addition, in order to reduce rolling resistance, a rubber composition containing, for example, 50 to 80 parts by weight of high-structure carbon black is used. It is also known to mix BRs with many linear components (less branches) as BRs in order to reduce rolling resistance (for example, see Japanese Patent Laid-Open No. 2004-106796). [0004] However, these rubber compositions have problems i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/00B60C15/06C08K3/04C08K5/16
CPCC08L9/00B60C2015/0614C08K5/16C08K5/29C08L7/00C08K3/04C08L2666/08
Inventor 田口隆文
Owner SUMITOMO RUBBER IND LTD
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