Sumitomo Rubber Industries Limited

Hiroki Nakajima

Takayuki Nagase

Kensuke Washizu

Takuya Horiguchi

Kenji Mori

Takuma Yoshizumi

Shigeki Otsubo

Tatsuya Sasaki

Eiji Yamaguchi

Provided is a tire structure technology with which sufficient reading performance can be maintained even when a tire having an electronic component provided therein is caused to travel at high speed with severe handling. A pneumatic tire in which an electronic component is provided farther outward in a tire axial direction than a carcass, and in which the E*(1)at 50° C. and E*(1)at 150° C. of a first rubber member, and the E*(2)at 50° C. and E*(2)at 150° C. of a second rubber member, satisfy the following formula, where the first rubber member is a tire rubber member that has the greatest E* at 50° C. among tire rubber members positioned inward from the electronic component in the tire axial direction, and the second rubber member is a tire rubber member that has the greatest E* at 50° C. among tire rubber members positioned outward from the electronic component in the tire axial direction.(*(1)*(2))−(*(1)*(2))≥1.0

Pneumatic tire

Provided is a tire manufacturing feature in which even when an electronic component is embedded in a tire, damage due to impact load during traveling on the road surface is inhibited and the durability of the tire is prevented from deteriorating. A pneumatic tire provided with: a bead reinforcing layer provided in the tire-axial-direction outer side of the carcass of a bead part the bead reinforcing layer reinforcing the bead part from the outer side of the carcass; a clinch member provided on the tire-axial-direction outer side of the bead reinforcing layer; and an electronic device. The clinch member has a rigidity lower than that of the bead reinforcing layer, and the electronic component is embedded between the bead reinforcing layer and the clinch member.

Provided is a tire structure technology with which sufficient reading performance can be maintained even when a tire having an electronic component provided therein is caused to drive under high speed and severe handling. A pneumatic tire in which an electronic component is provided farther outward in a tire axial direction than a carcass, and in which the tan &#x3b4;(1)and tan &#x3b4;(1)of a first rubber member, and the tan &#x3b4;(2)and tan &#x3b4;(2)of a second rubber member, satisfy the following formula, where the first rubber member is a tire rubber member that has the greatest E* at 50&#xb0; C. among tire rubber members positioned outward from the electronic component in the tire axial direction, and the second rubber member is a tire rubber member that has the greatest E* at 50&#xb0; C. among tire rubber members positioned inward from the electronic component in the tire axial direction.(tan &#x3b4;(1)+tan &#x3b4;(2))&#x2212;(tan &#x3b4;(1)+tan &#x3b4;(2))&#x2264;0.08

A pneumatic tire having a tread, a sidewall, a bead portion having a bead core, a bead reinforcing layer reinforcing the bead portion, and a carcass ply moored on a bead core of the bead portion, wherein the bead reinforcing layer and adjacent members adjacent to the bead reinforcing layer are each composed of a rubber composition containing an amine type antioxidant, 0.3 to 8 parts by mass of the amine type antioxidant is contained in the bead reinforcing layer based on 100 parts by mass of the rubber component, and the adjacent member adjacent to the bead reinforcing layer and the bead reinforcing layer satisfy the following formula:2&#x2264;B/A&#x2264;8A: Content (wt %) of amine type antioxidant in bead reinforcing layer.B: Content (wt %) of amine type antioxidant in the adjacent member.

Provide is a pneumatic tire that is excellent in air retention properties and adhesion at the interface between the innerliner and the insulation, particularly in the joint portion. Included is a pneumatic tire including: a carcass; an insulation adjacent to the radially inner side of the carcass; and an innerliner adjacent to the radially inner side of the insulation, the innerliner including an innerliner rubber composition, the innerliner rubber composition containing a polymer component including, based on 100% by mass thereof, 80 to 100% by mass of a butyl-based rubber and containing, per 100 parts by mass of the polymer component, 40 to 70 parts by mass of carbon black, 0.5 to 5.0 parts by mass of zinc oxide, and 0.2 to 5.0 parts by mass of sulfur, the insulation including an insulation rubber composition, the insulation rubber composition containing a polymer component including, based on 100% by mass thereof, 20 to 90% by mass of a butyl-based rubber and 10 to 80% by mass of an isoprene-based rubber and containing, per 100 parts by mass of the polymer component, 40 to 80 parts by mass of carbon black and 0.2 to 5.0 parts by mass of sulfur, the innerliner and insulation rubber compositions having butyl-based rubber contents based on 100% by mass of the polymer component that satisfy the following relationship:

An object of the present invention is to provide a rubber composition for tire which can improve initial grip performance and stable grip performance during running at a high level while maintaining sufficient abrasion resistance, and a pneumatic tire having a tread composed of this rubber composition for tire. The rubber composition for tire comprises 70 to 200 parts by mass of a filler and 60 to 250 parts by mass of a softener compounding 15 to 60 parts by mass of a predetermined tackifying resin with a softening point of not less than 110&#xb0; C. based on 100 parts by mass of a diene rubber component comprising not less than 20% by mass of a SBRa having a glass transition temperature of &#x2212;35 to 15&#xb0; C., a styrene content of 35 to 48% by mass and a vinyl unit quantity in the butadiene component of 35 to 55%.

Rubber composition for tire and pneumatic tire

The present invention provides a pneumatic tire that achieves a balanced improvement in initial grip performance, grip performance during running, and abrasion resistance. The present invention relates to a pneumatic tire including a tread formed from a rubber composition, the rubber composition containing a rubber component, a solventless acrylic resin, and a liquid xylene resin, and having a solventless acrylic resin content of 1 to 50 parts by mass and a liquid xylene resin content of 5 to 100 parts by mass, each per 100 parts by mass of the rubber component.

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Kobe, Japan

Hiroki Nakajima