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Hydrolytically-and proteolytically-stable polycarbonate polyurethane silicone copolymers

  • US 5,863,627 A
  • Filed: 08/26/1997
  • Issued: 01/26/1999
  • Est. Priority Date: 08/26/1997
  • Status: Expired due to Term
First Claim
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1. A biodurable polycarbonate polyurethane block copolymer comprising(a) a polycarbonate glycol internal segment;

  • (b) a polyurethane internal segment;

    (c) a polydialkylsiloxane internal segment;

    (d) di(C1-6 alkyl)amino or C1-6 hydroxyalkyl terminating segments;

    (e) cyclo(C5-7 alkane)diamino internal segments; and

    (f) C2-4 alkylene diamino internal segments;

    wherein said segments are linked by urethane, urea, and C--Si--C moieties, said block copolymer being devoid of hydrolytically unstable Si--O--C linkages and being substantially devoid of ether linkages.

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