Rubber composition for tread

A technology of rubber composition and tread, applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of insufficient dispersion, large primary particle size, and insufficient performance.

Inactive Publication Date: 2009-01-28
SUMITOMO RUBBER IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Japanese Patent Application Laid-Open No. 2005-225905 and Japanese Patent Laid-Open No. 2005-247899 disclose that polybutadiene rubber (VCR412, manufactured by Ube Industries, Ltd.) in which syndiotactic-1,2-polybutadiene is dispersed is mixed. Rubber composition for tires, since the average primary particle size of syndiotactic-1,2-polybutadiene in butadiene rubber is large (250nm), it cannot be dispersed sufficiently, so sufficient performance cannot be obtained

Method used

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  • Rubber composition for tread
  • Rubber composition for tread
  • Rubber composition for tread

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7 and comparative example 1～16

[0069] (Manufacturing method of test tire)

[0070] According to the compounding contents in Tables 1 to 4, the above-mentioned compounding ingredients except sulfur and vulcanization accelerator were mixed in a Banbury internal mixer under the conditions of a maximum mixing temperature of 150°C and a mixing time of 4 minutes.

[0071] Next, add sulfur and a vulcanization accelerator, knead using an open mill at a kneading temperature of 40 to 60° C. and a kneading time of 4 minutes, and extrude into a rubber sheet using an extruder.

[0072] By molding the obtained rubber sheet into the shape of a tread, laminating it with other tire components, and vulcanizing it at 150° C. for 35 minutes, the test tires of Examples 1 to 7 and Comparative Examples 1 to 16 (tire size 11R22 .5) for the following determination tests.

[0073]

[0074] Using a test piece cut from a test tire, using a Lamborn abrasion tester (manufactured by Iwamoto Seisakusho), the test time is 5 minutes, the...

Embodiment 8～12 and comparative example 17～26

[0099] (Manufacturing method of studless tire for test)

[0100] According to the compounding contents in Tables 5 and 6, mix the above-mentioned compounding ingredients except sulfur and vulcanization accelerator at the mixing temperature

[0101] Under the conditions of 150° C. and a kneading time of 4 minutes, kneading was performed by a Banbury internal mixer.

[0102] Next, add sulfur and a vulcanization accelerator, use an open mill, and knead with a kneading temperature of 40-60°C and a kneading time of 4 minutes

[0103] Mixing is carried out under certain conditions, and extruded into rubber sheets using an extruder.

[0104] The obtained rubber sheet was molded into the shape of the tread, bonded to other tire parts, and vulcanized at 150° C. for 35 minutes to prepare the test studless tires of Examples 8 to 12 and Comparative Examples 17 to 26 (tire size 11R22.5), used for the following determination tests.

[0105]

[0106] A test piece was cut out from the ab...

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Abstract

Use of polybutadiene containing specific syndiotactic poly(1,2-butadiene) in a tread rubber can improve wearing resistance without impairing chipping / cutting resistance. A rubber composition for treads is provided which contains a rubber ingredient containing 10-30 wt.% butadiene rubber which contains syndiotactic poly(1,2-butadiene) dispersed therein having an average primary-particle diameter of 100 nm or smaller.

Description

technical field [0001] The invention relates to a rubber composition for treads. Background technique [0002] In tires, especially heavy-duty tires such as trucks and passenger cars tend to generate heat (heat generation tends to decrease), so in order to suppress the heat generation, for example, the particle size of carbon black is increased, or the method of reducing carbon black is used. The method of compounding amount, etc. However, in each of these cases, there arises a problem of a decrease in wear resistance. [0003] In order to improve wear resistance, butadiene rubber (BR) is added as a rubber component, but at this time, with the use of the tire, the strength and elongation of the tread will decrease, and cut marks will occur on the tread, which may be driven by the vehicle. And the problem that most of the fine pieces of the tread rubber fall off due to braking (decreased resistance to blockage). [0004] In this way, especially in heavy-duty tires, it is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00B60C1/00
CPCC08K3/04C08L7/00C08L21/00C08L9/00B60C1/0016C08L2666/08
Inventor 石田博一广真誉和田隆
Owner SUMITOMO RUBBER IND LTD
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