{
  "$type": "site.standard.document",
  "description": "The present invention relates to a branched conjugated diene copolymer which is useful for preparing a rubber composition, having high uniformity of a temperature dependence curve of a viscoelasticity tan´, for a tire, a rubber composition comprising the copolymer, and a pneumatic tire produced…",
  "path": "/patents/976327",
  "publishedAt": "2014-04-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/00",
    "SUMITOMO RUBBER IND [JP]"
  ],
  "textContent": "The present invention relates to a branched conjugated diene copolymer which is useful for preparing a rubber composition, having high uniformity of a temperature dependence curve of a viscoelasticity tan´, for a tire, a rubber composition comprising the copolymer, and a pneumatic tire produced using the rubber composition for a tire. The branched conjugated diene copolymer is composed of monomer components comprising a branched conjugated diene compound represented by a general formula (1): wherein R 1 represents an aliphatic hydrocarbon group having 6 to 11 carbon atoms, and an aromatic vinyl compound represented by a general formula (2): wherein R 2 represents an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R 5 represents a hydrogen atom or the like, and a copolymerization ratio (m) of the aromatic vinyl compound (2) is 45% by mass or more.",
  "title": "BRANCHED CONJUGATED DIENE COPOLYMER, RUBBER COMPOSITION AND PNEUMATIC TIRE"
}