Rubber composition for tire tread, and pneumatic tire

A rubber composition, tire tread technology, applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of reduced rolling resistance, low affinity, insufficient and other problems, achieve excellent processability, wet road Excellent performance and low rolling resistance

Active Publication Date: 2015-11-18
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, silica has the following problems: the affinity with the rubber component is low, and the cohesion between silicas is high, so even if only silica is blende

Method used

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  • Rubber composition for tire tread, and pneumatic tire
  • Rubber composition for tire tread, and pneumatic tire
  • Rubber composition for tire tread, and pneumatic tire

Examples

Experimental program
Comparison scheme
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Embodiment

[0266] Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.

[0267]

[0268] Add cyclohexane 4533g, styrene 338.9g (3.254mol), butadiene 468.0g (8.652mol), isoprene 20.0g (0.294mol) and N,N,N',N'-tetramethylethylenediamine 0.189mL (1.271mmol), start stirring. After bringing the temperature of the contents in the reaction vessel to 50° C., 5.061 mL (7.945 mmol) of n-butyl lithium was added. After the polymerization conversion rate reached approximately 100%, 12.0 g of isoprene was further added and allowed to react for 5 minutes, and then 0.281 g (0.318 mmol), let it react for 30 minutes. Furthermore, 18.3 g (0.318 mmol) of the 40 mass % xylene solution (the same follows.) of polyorganosiloxane A represented by following formula (9) was added, and it was made to react for 30 minutes. Methanol 0.5 mL was added and stirred for 30 minutes. A small amount of anti-aging agent (Irganox 1520, manufactured by BA...

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Abstract

Provided is a rubber composition for tire tread, comprising: a diene rubber component containing 20 mass% or more of a specific denatured conjugated diene rubber; silica contained in the quantity of 60-200 parts by mass with respect to 100 parts by mass of said rubber component; and polysiloxane represented by averaged compositional formula (1), and contained in the quantity of 1-20 mass% with respect to the quantity of silica. Formula (1): (A)a(B)b(C)c(D)d(R1)eSiO(4-2a-b-c-d-e)/2 (In the formula, A represents a bivalent organic group containing a sulfide group, B represents a C5-10 monovalent hydrocarbon group, C represents a hydrolyzable group, D represents an organic group containing a mercapto group, R1 represents a C1-4 monovalent hydrocarbon group, and a-e satisfy the conditional formulae 0≤a<1, 0≤b<1, 0<c<3, 0<d<1, 0≤e<2, and 0<2a+b+c+d+e<4, with the caveat that either a or b is not 0.) Also provided is a pneumatic tire using said composition in tire tread.

Description

technical field [0001] The invention relates to a rubber composition for tire tread and a pneumatic tire. Background technique [0002] In recent years, reduction in rolling resistance of tires has been demanded from the standpoint of low fuel consumption during vehicle running. In addition, from the viewpoint of safety, it is required to improve wet performance. On the other hand, there is known a method of blending silica into a rubber component constituting a tread portion of a tire to achieve both low rolling resistance and wet performance. [0003] However, silica has the following problems: the affinity with the rubber component is low, and the cohesion between silicas is high, so even if only silica is blended in the rubber component, the silica does not disperse and cannot The effect of reducing rolling resistance and the effect of improving wet performance are sufficiently obtained. [0004] Among them, as silica dispersion technology, the applicant of the presen...

Claims

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Application Information

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IPC IPC(8): C08L9/00C08L15/00C08K3/36C08K5/548C08L83/08C08L83/14B60C1/00
CPCB60C1/00B60C1/0016C08G77/14C08G77/392C08K5/548C08L9/06C08L15/00C08L83/08C08C19/25C08K3/36C08L45/00C08C19/44Y02T10/86C08L9/00C08F297/04C08C19/20C08F299/02
Inventor 佐藤正树三原谕
Owner YOKOHAMA RUBBER CO LTD
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