{
  "$type": "site.standard.document",
  "description": "To address a problem of providing recovered carbon black capable of maintaining the physical properties of a rubber composition even when reused in the rubber composition, and also providing a mixture of such recovered carbon black and a liquid polymer, a solution is: recovered carbon black…",
  "path": "/patents/1390327",
  "publishedAt": "2026-06-10T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60C1/00",
    "BRIDGESTONE CORP [JP]"
  ],
  "textContent": "To address a problem of providing recovered carbon black capable of maintaining the physical properties of a rubber composition even when reused in the rubber composition, and also providing a mixture of such recovered carbon black and a liquid polymer, a solution is: recovered carbon black obtained by decomposition of crosslinked rubber containing diene rubber and carbon black, wherein a proportion of aggregates having a diameter of 5 µm or more, as determined using a particle size analyzer in a state where the recovered carbon black is dispersed ultrasonically in toluene solvent, is 50 vol% or less; and a mixture of such recovered carbon black and a liquid polymer, wherein the liquid polymer has a weight-average molecular weight of 300,000 or less.",
  "title": "RECYCLED CARBON BLACK, MIXTURE OF RECYCLED CARBON BLACK AND LIQUID POLYMER, RUBBER COMPOSITION, AND RUBBER PRODUCT"
}