{
  "$type": "site.standard.document",
  "description": "In order to improve steering stability at the time of turning while ensuring good fuel efficiency, there is provided a tire tread rubber composition including a rubber component containing styrene-butadiene-based rubber and isoprene-based rubber, wherein the hardness Hs at 23 °C is 55 or greater…",
  "path": "/patents/1391435",
  "publishedAt": "2025-08-27T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "TOYO TIRE CORP [JP]"
  ],
  "textContent": "In order to improve steering stability at the time of turning while ensuring good fuel efficiency, there is provided a tire tread rubber composition including a rubber component containing styrene-butadiene-based rubber and isoprene-based rubber, wherein the hardness Hs at 23 °C is 55 or greater and 62 or less, and the hardness Hs at 23 °C and the loss tangent tan δ at 35 °C satisfy the following formula: 0.240 ≤ tan δ/Hs × 100 ≤ 0.320. There is also provided a tire having a tread composed of this tire tread rubber composition.",
  "title": "TIRE TREAD RUBBER COMPOSITION AND TIRE USING THE SAME"
}