Solid lubricant and process for preparing it

{
  "publication_number": "US4529826A",
  "country": "US",
  "kind": "A",
  "title": "Solid lubricant and process for preparing it",
  "abstract": "A solid lubricant, consisting of solid perfluorocarbons, with linear or substantially linear carbon atoms chain, containing from 10 to 20 carbon atoms and having a value of surface tension ranging from 13 to 15 dyne/cm, is obtained by dimerization or co-dimerization of perfluorocarbonsulphonyl halogenides C.sub.n F.sub.2n+1 SO.sub.2 X (in which X represents an atom of halogen), having a linear or substantially linear chain of carbon atoms and bearing the --SO 2 X group at one end of the chain, operating at high temperature, with short reaction times, and preferably in the presence of a metal catalyst. The solid perfluorocarbon lubricant can be used, if desired as a mixture with paraffinic wax, on sliding surfaces, particularly consisting of a polymeric material either porous or made porous.",
  "claims": [
    "1. Process for preparing a solid lubricant, consisting of solid perfluorocarbons, with a linear or substantially linear chain of carbon atoms, containing from 10 to 20 carbon atoms and having values of the crytical surface tension ranging from 13 to 15 dyne/cm, characterized in that perfluorocarbonsulphonyl halides C n F 2n+1 --SO 2 X, in which X is a halogen and n is an even or lower than 10 number, with linear or substantially linear chain and bearing the --SO 2 X group at one end of the chain are submitted to a reaction of dimerization or of co-dimerization, operating at a temperature between 400° and 550° C. and for a time of from 1 to 30 seconds.",
    "2. Process as claimed in claim 1, characterized in that X in the formula C n F 2n+1 --SO 2 X represents fluorine.",
    "3. Process as claimed in claim 1, characterized in that n in the formula C n F 2n+1 --SO 2 X ranges from 4 to 8.",
    "4. Process as claimed in claim 1, characterized in that the reaction is effected in the presence of a catalytic metal chosen among copper, nickel and chromium.",
    "5. Process as claimed in the claims 1 or 4, characterized in that the perfluorocarbonsulphonyl halides are fed in as vapours at one end of a tubular reaction vessel containing copper, nickel or chromium in the form either of powder or of pellets, as a fixed bed."
  ],
  "cpc": [
    "C09G 3/00",
    "C10M 101/02",
    "C10M 105/50",
    "C10M 105/52",
    "C10M 111/00",
    "C10M 131/04",
    "C10M 169/04",
    "C10M 2205/163",
    "C10M 2211/022",
    "C10M 2211/06",
    "C10M 2211/063",
    "C10N 2030/06",
    "C10N 2030/26",
    "C10N 2050/08"
  ],
  "assignees": [
    "ENICHIMICA SECONDARIA"
  ],
  "filing_date": "1984-07-24",
  "publication_date": "1985-07-16",
  "grant_date": "1985-07-16",
  "priority_date": "1983-07-28",
  "application_number": "US-63394484-A",
  "family_id": "26328153",
  "citations": [
    "US3129254A"
  ]
}