Rubber laminate

{
  "publication_number": "US8865316B2",
  "country": "US",
  "kind": "B2",
  "title": "Rubber laminate",
  "abstract": "A rubber laminate comprises a reinforcing layer and a second rubber layer laminated sequentially on a first rubber layer, at least one outer surface of the first rubber layer and the second rubber layer being covered with an ultra high molecular weight polyethylene layer, wherein the rubber layers covered with the ultra high molecular weight polyethylene layer are formed from a rubber composition comprising from 20 to 40 parts by mass of a softener per 100 parts by mass of a mixed rubber consisting of from 60 to 80% by mass ratio of a diene rubber and 20 to 40% by mass ratio of a ethylene-propylene-diene rubber and/or a butyl rubber.",
  "claims": [
    "1. A rubber laminate comprising: a reinforcing layer and a second rubber layer laminated sequentially on a first rubber layer, at least one outer surface of the first rubber layer and the second rubber layer being covered with an ultra high molecular weight polyethylene layer, wherein the rubber layers covered with the ultra high molecular weight polyethylene layer are formed from a rubber composition comprising from 20 to 40 parts by mass of a softener per 100 parts by mass of a mixed rubber including from 60 to 80% by mass ratio of styrene butadiene rubber (SBR), natural rubber (NR), isoprene rubber (IR), or butadiene rubber (BR) and 20 to 40% by mass ratio of a ethylene-propylene-diene rubber and/or a butyl rubber.",
    "2. The rubber laminate according to claim 1, wherein the softener is a paraffin oil.",
    "3. The rubber laminate according to claim 1, wherein a molecular weight of the ultra high molecular weight polyethylene is 1,000,000 or more.",
    "4. The rubber laminate according to claim 1, which is a hose, wherein the first rubber layer and the second rubber layer are configured as an inner surface rubber layer and an outer surface rubber layer, respectively, the outer surface rubber layer is formed from the rubber composition, and a surface thereof is covered with the ultra high molecular weight polyethylene layer.",
    "5. The rubber laminate according to claim 1, which is a conveyer belt, wherein the first rubber layer and the second rubber layer are configured as an inner side rubber layer and an outer side rubber layer, respectively, at least the outer side rubber layer is formed from the rubber composition, and a surface thereof is covered with the ultra high molecular weight polyethylene layer.",
    "6. The rubber laminate according to claim 1, wherein the reinforcing layer comprises at least one layer of a braid or spiral formed from brass plated wires, steel cords, or organic fiber cords.",
    "7. The rubber laminate according to claim 6, wherein the reinforcing layer comprises the brass plated wires.",
    "8. The rubber laminate according to claim 1, further comprising a thin insulation rubber layer between the ultra high molecular weight polyethylene layer and the reinforcing layer.",
    "9. The rubber laminate according to claim 1, wherein the rubber layers covered with the ultra high molecular weight polyethylene layer are formed from the rubber composition comprising from 20 to 40 parts by mass of the softener per 100 parts by mass of the mixed rubber comprising from 60 to 80% by mass ratio of the diene rubber and 20 to 40% by mass ratio of the ethylene-propylene-diene rubber.",
    "10. The rubber laminate according to claim 1, wherein the ultra high molecular weight polyethylene layer covers the outer surface of the first rubber layer.",
    "11. The rubber laminate according to claim 1, wherein the ultra high molecular weight polyethylene layer covers the outer surface of the second rubber layer.",
    "12. The rubber laminate according to claim 1, wherein the ultra high molecular weight polyethylene layer covers the outer surface of each of the first rubber layer and the second rubber layer.",
    "13. The rubber laminate according to claim 1, further comprising an identification mark on the second rubber layer, the ultra high molecular weight polyethylene layer covering the outer surface of the second rubber layer.",
    "14. The rubber laminate according to claim 1, wherein the first and second rubber layers comprise a same rubber composition.",
    "15. The rubber laminate according to claim 1, wherein the mixed rubber includes from 60 to 80% by mass ratio of the styrene butadiene rubber (SBR) and 20 to 40% by mass ratio of the ethylene-propylene-diene rubber and/or the butyl rubber."
  ],
  "description_excerpt": "The present technology relates to a rubber laminate, and particularly relates to a rubber laminate such as a hose or a conveyer belt having improved abrasion resistance and weatherability.\n\nHigh pressure hoses used in construction machinery and the like and conveyer belts used in transporting particulates and the like may repeatedly come in contact with surrounding metal frames and metal piping due to vibrations and the like exerted on surrounding equipment. Therefore, the high pressure hoses and the conveyer belts that are used under such conditions need to have high abrasion resistance. Covering surfaces of the hoses and the conveyer belts with a material having superior abrasion resistance such as an ultra high molecular weight polyethylene (UHMwPE) is conceivable to improve abrasion resistance, but there is a problem in that adhesiveness between some rubber compositions and the ultra high molecular weight polyethylene is low. In order to solve this sort of problem, Japanese Unexamined Patent Application Publication No. 2003-207078A describes a hose having an outer surface rubber layer that is formed from a rubber composition having a styrene-butadiene rubber (SBR) compounded with from 10 to 50 parts by mass of a softener and/or a plasticizer as a main component and that is covered with an ultra high molecular weight polyethylene.",
  "cpc": [
    "B32B 25/08",
    "B32B 1/08",
    "B32B 2270/00",
    "B32B 2307/554",
    "B32B 2307/71",
    "B32B 2307/712",
    "B32B 2433/02",
    "B32B 25/14",
    "B32B 25/16",
    "B32B 25/18",
    "B32B 2597/00",
    "B32B 27/327",
    "B65G 15/34",
    "F16L 11/08",
    "Y10T 428/1386",
    "Y10T 428/2936",
    "Y10T 428/31696",
    "Y10T 428/31913",
    "Y10T 428/31917"
  ],
  "ipc": [
    "B29D 22/00",
    "B32B 1/08",
    "B32B 15/08",
    "B32B 25/08",
    "B32B 25/14",
    "B32B 25/16",
    "B32B 25/18",
    "B32B 27/08",
    "B32B 27/32",
    "B65G 15/34",
    "F16L 11/08"
  ],
  "assignees": [
    "GONG PENG",
    "YAMAKAWA KAZUTO",
    "TORII NAOTO",
    "SATO AKIRA",
    "YOKOHAMA RUBBER CO LTD"
  ],
  "inventors": [
    "GONG PENG",
    "YAMAKAWA KAZUTO",
    "TORII NAOTO",
    "SATO AKIRA"
  ],
  "filing_date": "2009-12-28",
  "publication_date": "2014-10-21",
  "grant_date": "2014-10-21",
  "priority_date": "2009-10-06",
  "application_number": "US-200913500190-A",
  "family_id": "43856486",
  "citations": [
    "GB2256615A",
    "JP2003207078A",
    "JP2005524722A",
    "JPH06184326A",
    "JPH10298353A",
    "US2003134983A1",
    "US6334466B1",
    "US7758937B2",
    "WO2008108198A1",
    "WO2011042998A1"
  ]
}