Rubber composition for seismic isolation laminates

{
  "publication_number": "US6180711B1",
  "country": "US",
  "kind": "B1",
  "title": "Rubber composition for seismic isolation laminates",
  "abstract": "This invention relates to a rubber composition for seismic isolation laminate which exhibits excellent damping capacity as well as sufficient hardening properties. Such rubber composition for a seismic isolation laminate comprises at least a diene rubber; and 40 to 160 parts by weight of carbon black having a CTAB specific surface area of 120 to 370 (m 2 /g) and a CTAB specific surface area (m 2 /g)/iodine adsorption (mg/g) of up to 1.0 per 100 parts by weight of the diene rubber.",
  "claims": [
    "1. A rubber composition for a seismic isolation laminate comprising at least a diene rubber; and 40 to 160 parts by weight of carbon black having a CTAB specific surface area of 120 to 370 (m 2 /g) and a CTAB specific surface area (m 2 /g)/iodine adsorption (mg/g) of up to 1.0 per 100 parts by weight of the diene rubber.",
    "2. A rubber composition for a seismic isolation laminate according to claim 1 characterized in that the rubber composition has a CF value in the range of 2.4 to 10.5 when the CF value is calculated by the following formula (1): CF =  (Dst) 1.1 × (24  M4DBP   oil   absorption   number) 0.4  (volume   fraction   of   carbon   black   in  the   rubber   composition) 3 × 10 4 wherein Dst is Stokes equivalent diameter (nm) of carbon black aggregates of the maximum frequency in centrifugal precipitation; 24M4DBP oil absorption number (dibutyl phthalate absorption number of compressed sample) (ml/100 g) represents the degree of primary structure development of the carbon black; and the carbon volume fraction in the rubber composition is (volume of the carbon)/(volume of the rubber composition)."
  ],
  "cpc": [
    "B32B 15/06",
    "B32B 2307/56",
    "B32B 25/04",
    "B32B 25/16",
    "C08K 3/04",
    "C08L 21/00",
    "C08L 9/00",
    "E02D 2300/0001",
    "E02D 27/34",
    "F16F 1/3605",
    "F16F 1/40",
    "F16F 7/108"
  ],
  "assignees": [
    "YOKOHAMA RUBBER CO LTD"
  ],
  "filing_date": "1997-10-13",
  "publication_date": "2001-01-30",
  "grant_date": "2001-01-30",
  "priority_date": "1997-01-22",
  "application_number": "US-34195899-A",
  "family_id": "11716411",
  "citations": [
    "JPH10110063A",
    "JPH10110064A",
    "US3663350A",
    "US5182888A",
    "US6107389A",
    "WO9832794A1"
  ]
}