{
  "$type": "site.standard.document",
  "description": "[0001] The present invention provides a rubber composition for a tire tread having excellent wet performance and low rolling resistance when formed into a tire as well as excellent processability. The present invention is a rubber composition for a tire tread containing a diene rubber component…",
  "path": "/patents/954804",
  "publishedAt": "2015-12-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/00",
    "YOKOHAMA RUBBER CO LTD [JP]"
  ],
  "textContent": "[0001] The present invention provides a rubber composition for a tire tread having excellent wet performance and low rolling resistance when formed into a tire as well as excellent processability. The present invention is a rubber composition for a tire tread containing a diene rubber component containing at least 20 mass% of a modified conjugated diene rubber, a silica, and a silane coupling agent; the modified conjugated diene rubber having at least one modified part and at least one conjugated diene rubber part; the conjugated diene rubber part having a conjugated diene copolymer block and an isoprene block containing from 70 mass% to 100 mass% of isoprene units in each conjugated diene rubber part; the modified part bonding to an end of the conjugated diene rubber part; the modified part having a functional group which interacts with the silica; the silane coupling agent being a polysiloxane represented by the following formula (1); a content of the silica being from 60 to 200 parts by mass per 100 parts by mass of the diene rubber component; and a content of the silcane coupling agent being from 1.0 to 20 mass% of the content of the silica; and a pneumatic tire having tire treads formed using the rubber composition. (A)(B)(C)(D)(R)SiO (1) [Formula (1) is an average composition formula, and in formula (1), A is a divalent organic group containing a sulfide group; B is a monovalent hydrocarbon group having from 5 to 10 carbon atoms; C is a hydrolyzable group; D is an organic group containing a mercapto group; Ris a monovalent hydrocarbon group having from 1 to 4 carbon atoms; and a to e satisfy the relational expressions 0≤a",
  "title": "RUBBER COMPOSITION FOR TIRE TREAD, AND PNEUMATIC TIRE"
}