{
  "$type": "site.standard.document",
  "description": "An object of the present invention is to improve propulsion performance on a snow-covered road surface, and provided is a tire with a tread portion having a groove, wherein the cap rubber layer forming the tread portion contains 40 parts by mass or more and 80 parts by mass or less of…",
  "path": "/patents/1394889",
  "publishedAt": "2025-07-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "An object of the present invention is to improve propulsion performance on a snow-covered road surface, and provided is a tire with a tread portion having a groove, wherein the cap rubber layer forming the tread portion contains 40 parts by mass or more and 80 parts by mass or less of styrene-butadiene rubber (SBR) having a styrene content of 25% by mass or less in 100 parts by mass of its rubber component, and 60 parts by mass or more of a filler with respect to 100 parts by mass of the rubber component, and is formed from a rubber composition having a loss tangent 10°Ctan δ measured under the conditions of temperature of 10°C, frequency of 10 Hz, initial strain of 5%, and dynamic strain rate of 1 % and in deformation mode; tensile of less than 0.28, and a glass transition temperature Tg (°C) of -40°C or lower; and the glass transition temperature Tg (°C) and the depth G(mm) of the groove satisfy Tg ≤ -0.5 × G - 35.",
  "title": "TIRE"
}