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Rubber composition for tire

A rubber composition and tire technology, applied in the fields of tire belts and pneumatic tires, tire treads, and bead fillers, can solve the problems of insufficient improvement in dry grip performance, wet grip performance and wear resistance. , to achieve excellent wet grip performance and ice surface grip performance, to achieve the effect of excellent handling stability and excellent wear resistance

Active Publication Date: 2020-04-17
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using a conventional workability improver, although the workability is improved, there is a problem that the dry grip performance, wet grip performance and abrasion resistance are not sufficiently improved.

Method used

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  • Rubber composition for tire
  • Rubber composition for tire
  • Rubber composition for tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 and comparative example 1

[0263] According to the mixing ratio (parts by mass) recorded in Table 3, solid rubber (A), modified liquid diene rubber (B), filler (C), TDAE, silane coupling agent, zinc white, stearic acid, The wax and anti-aging agent were put into a closed Banbury mixer respectively, and mixed for 6 minutes in such a way that the initial temperature reached 60°C and the resin temperature reached 150°C, and then they were taken out of the mixer and cooled to room temperature. Next, this mixture was put into the Banbury mixer again, a vulcanizing agent (sulfur) and a vulcanization accelerator were added, and kneading was carried out for 75 seconds so that the starting temperature reached 50°C and the limit temperature reached 100°C, thereby obtaining a rubber combination.

[0264] In addition, the obtained rubber composition was press-molded (145°C, 20 to 40 minutes) to produce a vulcanized rubber sheet (thickness 2mm) and a cylindrical test piece for friction coefficient measurement (width 1...

Embodiment 2~6 and comparative example 2~4

[0298] The solid rubber (A), modified liquid diene rubber (B) (unmodified liquid diene rubber in Comparative Examples 2 and 3, Comparative Example 4), filler (C), TDAE, silane coupling agent, zinc white, stearic acid, wax, and anti-aging agent were respectively put into the closed Banbury internal mixer, with the starting temperature reaching 60°C, the resin After kneading for 6 minutes so that the temperature may reach 150° C., it was taken out of the internal mixer and cooled to room temperature. Next, this mixture was put into the Banbury mixer again, a vulcanizing agent (sulfur) and a vulcanization accelerator were added, and kneading was carried out for 75 seconds so that the starting temperature reached 50°C and the limit temperature reached 100°C, thereby obtaining a rubber combination.

[0299] In addition, the obtained rubber composition was press-molded (145°C, 20 to 40 minutes) to prepare a vulcanized rubber sheet (thickness 2 mm) and a cylindrical test piece for f...

Embodiment 7 and comparative example 5

[0306] According to the compounding ratio (parts by mass) described in Table 5, a rubber composition was prepared in the same manner as in Example 3 (no modified liquid diene rubber was compounded in Comparative Example 5). The resulting rubber composition was press-molded (160°C, 20 to 40 minutes) to prepare a vulcanized rubber sheet (thickness 2 mm) and a cylindrical test piece for friction coefficient measurement (width 16 mm, diameter 80 mm), and evaluated wear resistance in the same manner as above. Consumption performance, ice grip performance, wet grip performance, handling stability, low fuel consumption performance. The respective evaluation results are relative values ​​when the value of Comparative Example 5 is taken as 100. The results are shown in Table 5.

[0307] [table 5]

[0308] .

[0309] Compared with Comparative Example 5, Example 7 using a modified liquid diene rubber does not impair abrasion resistance, ice grip performance, and wet grip performance...

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Abstract

Provided are: a rubber composition for a tire, the rubber composition being capable of producing a crosslinked product having excellent mechanical strength such as wear resistance; said crosslinked product; a tire tread partially using said composition or said crosslinked product, the tire tread having sufficient dry grip performance as well as excellent wet grip performance and ice grip performance and being capable of achieving improved steering stability; a bead filler; a tire belt; and a pneumatic tire. The rubber composition for a tire contains 0.1-50 parts by mass of a modified liquid diene-based rubber (B) having a functional group derived from a silane compound having a specific structure, and 20-200 parts by mass of a filler (C) with respect to 100 parts by mass of a solid rubber(A) having a glass transition temperature (Tg) of -10 degrees or lower, wherein the modified liquid diene-based rubber (B) satisfies (i)-(iv): (i) a weight average molecular weight (Mw) of no less than 1,000 and less than 15,000; (ii) a vinyl content of 70 mol% or less; (iii) 1-20 functional groups on average per one molecule of the modified liquid diene-based rubber (B); and (iv) a glass transition temperature of 0 degrees or lower.

Description

technical field [0001] The present invention relates to a rubber composition for tires, a tire tread at least partially using the same, a bead filler, a belt for tires, and a pneumatic tire. Background technique [0002] Pneumatic tires expect not only grip performance on dry roads (dry grip performance), but also grip performance on wet roads (wet grip performance), grip performance at low temperatures and snow accumulation ( Grip performance on ice) and the like are also at a high level, and further, excellent handling stability and wear resistance are required. [0003] As a method of improving dry grip performance, a method of using rubber with a high glass transition temperature (Tg) such as styrene-butadiene rubber, and a method of blending a large amount of carbon black with an average particle diameter of about 5 to 100 nm are known. However, these methods have problems in that the viscosity of the rubber composition for tire treads increases, the processability at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00B60C1/00B60C15/06C08K3/04C08K3/36C08K5/54C08L7/00C08L9/00C08L15/00
CPCC08L7/00C08L9/00C08L15/00B60C2001/0058B60C1/0016B60C2001/0066C08K2201/003C08L9/06C08C19/25C08C19/20Y02T10/86C08K3/36C08K3/04C08L21/00C08F8/42C08F8/30C08J3/24B60C15/00C08K2201/005C08K2201/011B60C11/0008B60C2011/0025C08L2201/08C08L2205/025C08L2205/035
Inventor 神原浩香田大辅
Owner KURARAY CO LTD