Rubber composition for outer tread and inflating tyre using said composition

A rubber composition and tread technology, which can be used in tire treads/tread patterns, special tires, tire parts, etc., can solve the problem of not being able to improve wear resistance and skid resistance at the same time.

Inactive Publication Date: 2003-09-10
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned prior art cannot simultaneously improve wear resistance and skid resistance at both normal temperature (about 20°C) and low temperature (about 0°C), and it has been required to maintain the same performance as normal temperature even at low temperature. Rubber composition for tread

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Embodiment 1～4 and comparative example 1～5

[0053] The rubber composition for treads was prepared by the following method. According to the blending amount shown in Table 2, each blending component was mixed in a Banbury mixer to prepare a rubber composition. Next, each rubber composition was extruded into a sheet form in an extruder, and vulcanized into a shape. The peak temperature of tan δ, Type A Duro hardness, and abrasion resistance were evaluated using the obtained test piece, and the evaluation results are shown in Table 3.

[0054] The production methods of aluminum hydroxide used in Examples and Comparative Examples are as follows, and their physical properties are shown in Table 1.

[0055] Aluminum Hydroxide A

[0056] Aluminum hydroxide obtained by hydrolyzing aluminum alkoxide (light-load volume specific gravity: 0.77 g / cm 3 , DOP oil absorption: 70 cm 3 / 100g) 376g and 5 decimeters 3 mixed with water to prepare a suspension with a solid content of 7% by weight. The suspension was passed through a co...

Embodiment 1

[0075] Example 1 is an example in which 30 parts by mass of carbon black is also blended together with 20 parts by mass of aluminum hydroxide A. In Examples 2 and 3, 20 parts by mass of aluminum hydroxide A was blended, and carbon black and silica were blended. On the other hand, Example 4 is an example in which 30 parts by mass of carbon black is also blended with 20 parts by mass of aluminum hydroxide B. In any of these examples, the hardness change (H2-H1) after thermal aging is small, the hardness change (H3-H1) due to temperature is also small, and the abrasion resistance is excellent.

[0076] As mentioned above, the present invention, due to the light-load volume specific gravity is small, DOP oil absorption and BET specific surface area infiltration of aluminum hydroxide in a specific range into the polyisoprene rubber or / or polybutadiene rubber as the main body In the rubber composition, the A-type Duro hardness and the peak temperature of tan δ are adjusted at the...

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Abstract

A tread rubber composition improved both in grip performance on ice-covered and snow-covered road surfaces and in abrasion resistance is provided. The tread rubber composition contains aluminum hydroxide having an untamped density of not more than 0.60 g / cm<3>, a DOP oil absorption of at least 70 cm<3> / 100g and less than 250 cm<3> / 100g, and a BET specific surface area of at least 30 m<2> / g and not more than 350 m<2> / g in an amount of 5-60 parts by weight with respect to 100 parts by weight of a rubber component containing at least 50% by weight of at least one of polyisoprene rubber and polybutadiene rubber. The tread rubber composition has a tan delta peak temperature of not more than -45 DEG C and a type A durometer hardness at 0 DEG C of not more than 64.

Description

Background of the invention [0001] The present invention relates to a rubber composition for an outer tread and a pneumatic tire using the composition. The rubber composition for an outer tread and the pneumatic tire using the composition have improved skid resistance on wet road surfaces, especially improved It improves the skid resistance and wear resistance on icy roads and snow-covered roads. Background technique [0002] In recent years, in order to meet the demand for low fuel consumption of automobiles, tires with improved wet skid resistance while reducing rolling resistance have been developed. As a technique for reducing rolling resistance, silica has been used to partially replace carbon black, which is widely used as a reinforcing agent, in an attempt to balance low fuel consumption and skid resistance, which are difficult to achieve. [0003] As an example of the prior art, US Patent No. 5,227,425 discloses a technique for improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60C1/00C08K3/22C08K5/548C08L9/00
CPCC08K3/22C08L9/00
Inventor 菊地尚彦
Owner SUMITOMO RUBBER IND LTD
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