Rubber composition for tires, and pneumatic tire using the same

Abstract

A rubber composition for tires is disclosed, which is capable of improving fuel efficiency, wear resistance, wet grip performance, and snow braking performance, and also a pneumatic tire using the same. A rubber composition for tires, including a rubber component containing at least a natural rubber and a butadiene rubber, an inorganic filler, a thermoplastic elastomer containing a functional group that reacts or interacts with a surface functional group of the inorganic filler and having a specific gravity of 1.00 or less, and a phosphate having a coagulation point of -55DC or less.

Description

technical field

[0001] The present invention relates to a rubber composition for tires and a pneumatic tire using the same. Background technique

[0002] Pneumatic tires are required not only excellent fuel efficiency but also grip performance on wet road surfaces, that is, excellent wet grip performance. However, since these characteristics are conflicting characteristics, it is difficult to simultaneously improve them. In addition, since the modulus of elasticity of the rubber composition increases at low temperatures, the grip performance deteriorates, and therefore winter tires also have technical problems in terms of low-temperature characteristics such as snow braking performance.

[0003] Patent Document 1 discloses a tire capable of reducing the rolling resistance of the tread, that is, low fuel consumption, without impairing other properties, especially wet grip characteristics. The tire is characterized in that the tread contains rubber A composition comprising a...

Examples

Embodiment

[0054] Hereinafter, examples of the present invention are shown, but the present invention is not limited to these examples.

Synthetic example 1

[0056] A cyclohexane solution (10% by mass) of 800 g of cyclohexane, 38 g of dehydrated styrene, and 7.7 g of sec-butyllithium was placed in a pressure vessel equipped with a stirring device, and a polymerization reaction was performed at 50° C. for 1 hour. A mixture of 127 g of styrene and butadiene (molar ratio styrene:butadiene=3:4) was added for 1 hour of polymerization, and 38 g of styrene was further added for 1 hour of polymerization. Then 2.5 g of chlorotriethoxysilane was added, and finally methanol was added to stop the reaction. The reaction solution is distilled under reduced pressure to remove the solvent to obtain a thermoplastic elastomer that is a polystyrene-(styrene / butadiene)-polystyrene type block copolymer having an ethoxysilyl group at one end. Body 5. The obtained thermoplastic elastomer 5 had a number average molecular weight of 163,000 and a styrene content of 74% by mass. In addition, the measurement of the number average molecular weight and styren...

technical field

[0001] The present invention relates to a rubber composition for tires and a pneumatic tire using the same. Background technique

[0002] Pneumatic tires are required not only excellent fuel efficiency but also grip performance on wet road surfaces, that is, excellent wet grip performance. However, since these characteristics are conflicting characteristics, it is difficult to simultaneously improve them. In addition, since the modulus of elasticity of the rubber composition increases at low temperatures, the grip performance deteriorates, and therefore winter tires also have technical problems in terms of low-temperature characteristics such as snow braking performance.

[0003] Patent Document 1 discloses a tire capable of reducing the rolling resistance of the tread, that is, low fuel consumption, without impairing other properties, especially wet grip characteristics. The tire is characterized in that the tread contains rubber A composition comprising a...

Examples

Embodiment

[0054] Hereinafter, examples of the present invention are shown, but the present invention is not limited to these examples.

Synthetic example 1

[0056] A cyclohexane solution (10% by mass) of 800 g of cyclohexane, 38 g of dehydrated styrene, and 7.7 g of sec-butyllithium was placed in a pressure vessel equipped with a stirring device, and a polymerization reaction was performed at 50° C. for 1 hour. A mixture of 127 g of styrene and butadiene (molar ratio styrene:butadiene=3:4) was added for 1 hour of polymerization, and 38 g of styrene was further added for 1 hour of polymerization. Then 2.5 g of chlorotriethoxysilane was added, and finally methanol was added to stop the reaction. The reaction solution is distilled under reduced pressure to remove the solvent to obtain a thermoplastic elastomer that is a polystyrene-(styrene / butadiene)-polystyrene type block copolymer having an ethoxysilyl group at one end. Body 5. The obtained thermoplastic elastomer 5 had a number average molecular weight of 163,000 and a styrene content of 74% by mass. In addition, the measurement of the number average molecular weight and styren...

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