RUBBER COMPOSITION FOR TIRE TREAD AND PNEUMATIC TIRE

[Task] To provide a rubber composition for a tire tread, which is capable of improving performance at ambient temperature, such as wet performance and dry performance, while suppressing a decrease in low-temperature performance. [Means for Resolution] A rubber composition for a tire tread includes,...

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Bibliographische Detailangaben
1. Verfasser:	TOCHIKA, Shinya
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	[Task] To provide a rubber composition for a tire tread, which is capable of improving performance at ambient temperature, such as wet performance and dry performance, while suppressing a decrease in low-temperature performance. [Means for Resolution] A rubber composition for a tire tread includes, per 100 parts by mass of a rubber component containing a styrene-butadiene rubber having a glass transition temperature of -60?C or less, 70 parts by mass or more of a reinforcing filler containing silica. The rubber composition has, when vulcanized, a storage modulus E'(-20?C) at a temperature of -20?C and a storage modulus E'(30?C) at a temperature of 30?C such that the ratio between E'(-20?C) and E'(30?C) measured under conditions of a frequency of 10 Hz, an initial strain of 10%, and a dynamic strain of ?0.25% satisfies 2.0::;; E'(-20?C)/E'(30?C) 5: 3.0. A pneumatic tire includes a tread rubber including the above rubber composition.