Patent ID: 7026423

Claim:
A polyurethane elastomeric composition which includes a silicon-based polycarbonate segment of the formula (Ib): wherein R 1 , R 2 , R 3 and R 4 , are the same or different and are hydrogen or an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; R 5 , R 6 , R 8 and R 9 are the same or different and are a straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; R 7 is a divalent linking group or an optionally substituted straight chain, branched or cyclic, saturated or unsaturated, hydrocarbon radical; n, y and z are integers of 0 or more; and x is an integer of 0 or more; provided that z is an integer of 1 or more.