{
  "$type": "site.standard.document",
  "description": "A pneumatic tire that achieves both reduction of rolling resistance and improvement of uneven wear resistance is provided. The pneumatic tire includes: a tread portion including at least two or more rubber layers including a surface layer and an inner layer in a center region centered at a tire…",
  "path": "/patents/1409677",
  "publishedAt": "2023-12-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "A pneumatic tire that achieves both reduction of rolling resistance and improvement of uneven wear resistance is provided. The pneumatic tire includes: a tread portion including at least two or more rubber layers including a surface layer and an inner layer in a center region centered at a tire equator line and having a width that is 50% of a ground-contact width of a ground-contact surface; and sidewall portions. The tread portion has a circumferential groove extending in a circumferential direction, and includes a plurality of land portions demarcated by the circumferential groove and ground-contact end portions. An outer portion of each sidewall portion is overlapped on an outer side of an end portion in a tire width direction of the tread portion, and each end portion in the width direction of the inner layer is located in a part of an interface between the surface layer and the sidewall portion. A complex elastic modulus E∗1 (MPa) of the surface layer and a complex elastic modulus E∗2 (MPa) of the inner layer satisfy (E∗2/E∗1)",
  "title": "PNEUMATIC TIRE"
}