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Polyurethanes containing perfluoroalkyl groups and a process for their production

  • US 4,540,765 A
  • Filed: 05/18/1984
  • Issued: 09/10/1985
  • Est. Priority Date: 05/27/1983
  • Status: Expired due to Term
First Claim
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1. A polyurethane containing perfluoroalkyl ligands and having as recurring structural units ##STR7## with chain ends of the formula


  • space="preserve" listing-type="equation">--YA.sub.m'"'"'
in whichX, Y and Z each independently is the skeletal radical of an aliphatic or aromatic di- or polyisocyanate,RF is a member selected from the group consisting of ##STR8## n is the number of isocyanate groups on the skeletal radical X and is an integer from 2 to 25,A is an isocyanate group protected by a blocking agent,m is the number of blocked isocyanate groups A on the skeletal radical Y and is an integer from 1 to 5,E is O, S or --NR'"'"'--,R'"'"' is H, alkyl or aryl,R is the radical of a compound containing at least two alcohol, amine and/or thiol groups,a and b are the number of --OH, --NR'"'"'H or --SH functions in the alcohols, amines or thiols R(EH).sub.(a+b) used and each is an integer from 0 to 10, andp is the number of isocyanate groups on the skeletal radical Z and is an integer from 0 to 25.

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