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Polysiloxane-containing polyurethane elastomeric compositions

  • US 6,313,254 B1
  • Filed: 05/17/1999
  • Issued: 11/06/2001
  • Est. Priority Date: 09/23/1996
  • Status: Expired due to Term
First Claim
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1. A polyurethane elastomeric composition comprising a hard segment and a soft segment, wherein the soft segment is formed from (a) about 2 wt. % to about 40 wt. % of at least one polyether, about 2 wt. % to about 40 wt. % of at least one polycarbonate macrodiol, or about 2 wt. % to about 40 wt. % of a combination of at least one polyether macrodiol and at least one polycarbonate macrodiol, wherein the polyether macrodiol is a compound of the formula:

  • whereinm is an integer of 4 or more; and

    n is an integer from 2 to 50; and

    (b) about 60 wt. % to about 98 wt. % of at least one polysiloxane macrodiol of formula (I);



    wherein R1, R2, R3, R4, R5, and R6 are each independently an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; and

    n is an integer from 1 to 100;

    wherein the hard segment is present in about 30 wt. % to about 60 wt. % of the polyurethane elastomeric composition and wherein the soft segment is present in about 40 wt. % to about 70 wt. % of the polyurethane elastomeric composition.

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