{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
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  "description": "The present invention provides a rubber composition for a sidewall or base tread, which offers good flex crack growth resistance, crack initiation resistance, durability, and fuel economy despite the use of a softener derived from non-petroleum resources; and also provides a pneumatic tire formed…",
  "path": "/patents/973572",
  "publishedAt": "2014-06-18T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/0016",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "The present invention provides a rubber composition for a sidewall or base tread, which offers good flex crack growth resistance, crack initiation resistance, durability, and fuel economy despite the use of a softener derived from non-petroleum resources; and also provides a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for a sidewall or base tread, containing a rubber component including at least two kinds of diene rubbers, and a myrcene polymer, wherein the rubber component includes at least one kind of diene rubber selected from the group consisting of natural rubber, epoxidized natural rubber, and butadiene rubber, and the myrcene polymer has a weight average molecular weight of 1000 to 500000.",
  "title": "Rubber composition for sidewall or base tread, and pneumatic tire"
}