{
  "$type": "site.standard.document",
  "description": "Provided is a pneumatic tire that has sufficiently improved grip performance on a wet ice road surface and exhibits excellent on-ice performance. The pneumatic tire is a pneumatic tire including a tread portion, wherein an outermost layer of the tread portion is formed by using a rubber composition…",
  "path": "/patents/1400111",
  "publishedAt": "2025-04-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "Provided is a pneumatic tire that has sufficiently improved grip performance on a wet ice road surface and exhibits excellent on-ice performance. The pneumatic tire is a pneumatic tire including a tread portion, wherein an outermost layer of the tread portion is formed by using a rubber composition containing vulcanized rubber powder, an area ratio Sr (%) of the vulcanized rubber powder in a cross-section of the outermost layer is not less than 5% and not greater than 50%, a loss tangent (30°C tanδ) of the rubber composition measured under conditions of 30°C, a frequency of 10 Hz, an initial strain of 5%, and a dynamic strain rate of 1% with deformation mode: tension is greater than 0.20, a sea ratio Se (%) in a ground-contact surface of the outermost layer is greater than 10%, and Sr/Se > 0.1 is satisfied in the outermost layer.",
  "title": "PNEUMATIC TIRE"
}