Rubber composition for conveyor belt and conveyor belt

{
  "publication_number": "US2020010648A1",
  "country": "US",
  "kind": "A1",
  "title": "Rubber composition for conveyor belt and conveyor belt",
  "abstract": "A rubber composition for a conveyor belt includes: a rubber component containing more than 50 mass % and 100 mass % or less of a butadiene rubber; and carbon black, in which a ratio of weight average molecular weight of the butadiene rubber to a long chain branching index of the butadiene rubber is 5.0×10 4 to 16.6×10 4, a content of the carbon black is from 60 to 100 parts by mass with respect to 100 parts by mass of the rubber component, a nitrogen adsorption specific surface area of the carbon black is from 85 to 160 m 2 /g, and a dibutyl phthalate oil absorption amount of the carbon black is from 105 to 140 mL/100 g. A conveyor belt includes: an upper surface cover rubber layer formed of the rubber composition for a conveyor belt; a reinforcing layer; and a lower surface cover rubber layer.",
  "claims": [
    "1. A rubber composition for a conveyor belt comprising: a rubber component containing more than 50 mass % and 100 mass % or less of a butadiene rubber; and carbon black, wherein a ratio of weight average molecular weight of the butadiene rubber to a long chain branching index of the butadiene rubber (weight average molecular weight/long chain branching index) is from 5.0×10 4 to 16.6×10 4, a content of the carbon black is from 60 to 100 parts by mass with respect to 100 parts by mass of the rubber component, a nitrogen adsorption specific surface area of the carbon black is from 85 to 160 m 2 /g, and a dibutyl phthalate oil absorption amount of the carbon black is from 105 to 140 mL/100 g. 2. The rubber composition for a conveyor belt according to claim 1, wherein the weight average molecular weight is from 500000 to 1000000. 3. The rubber composition for a conveyor belt according to claim 1, wherein the long chain branching index is from 0.1 to 12.0. 4. A conveyor belt comprising: an upper surface cover rubber layer formed of the rubber composition for a conveyor belt described in claim 1; a reinforcing layer; and a lower surface cover rubber layer. 5. The rubber composition for a conveyor belt according to claim 2, wherein the long chain branching index is from 0.1 to 12.0. 6. A conveyor belt comprising: an upper surface cover rubber layer formed of the rubber composition for a conveyor belt described in claim 2; a reinforcing layer; and a lower surface cover rubber layer. 7. A conveyor belt comprising: an upper surface cover rubber layer formed of the rubber composition for a conveyor belt described in claim 3; a reinforcing layer; and a lower surface cover rubber layer. 8. A conveyor belt comprising: an upper surface cover rubber layer formed of the rubber composition for a conveyor belt described in claim 5; a reinforcing layer; and a lower surface cover rubber layer."
  ],
  "description_excerpt": "The present invention relates to a rubber composition for a conveyor belt and a conveyor belt.\n\nIn recent years, a conveyor belt having a long life is required from the viewpoint of considering the environment. Regarding such a problem, a rubber composition for improving a wear resistance life of a belt conveyor has been proposed in the related art. For example, Patent Document 1 discloses a rubber composition for a belt of a belt conveyor containing a polybutadiene rubber synthesized by using a neodymium-based catalyst as a rubber component.\n\nPatent Document 1: JP 2003-105136 A\n\nIn such circumstances, the present inventors prepared a rubber composition with reference to Patent Document 1 and evaluated it, and as a result, found that such a rubber composition does not satisfy wear resistance or workability in some cases.\n\nTherefore, an object of the present invention is to provide a rubber composition for a conveyor belt having excellent wear resistance and workability and a conveyor belt.\n\nAs a result of diligent research to solve the problem described above, the present inventors found that in a case where a rubber component containing a butadiene rubber in a predetermined amount, and carbon black are contained, and a ratio of weight average molecular weight of the butadiene rubber to a long chain branching index of the butadiene rubber, a content, a nitrogen adsorption specific surface area, and a dibutyl phthalate oil absorption amount of the carbon black are within a predetermined range, a desired effect can be obtained, thereby completing the present invention.",
  "cpc": [
    "C08L 9/00",
    "B29D 29/06",
    "B65G 15/34",
    "C08K 2201/006",
    "C08K 3/04"
  ],
  "ipc": [
    "B65G 15/34",
    "C08K 3/04",
    "C08L 9/00"
  ],
  "assignees": [
    "Yokohama Rubber Co Ltd"
  ],
  "inventors": [
    "Deqing Zou"
  ],
  "filing_date": "2017-12-27",
  "publication_date": "2020-01-09",
  "priority_date": "2017-03-14",
  "application_number": "US-201716493187-A",
  "family_id": "63522924",
  "cited_by_count": 0,
  "citations": [
    "AU6549001A",
    "US20120208919A1",
    "US9580249B2",
    "US20180273723A1"
  ]
}