Patent ID: 6313254
Filing Date: 2001-11-06
Classification: A61L,C08G,Y10S,Y10T

Abstract:
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: ##STR4##whereinm is an integer of 4 or more; andn 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): ##STR5##whereinR.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are each independently an optionally substituted straight chain, branched or cyclic, saturated or unsaturated hydrocarbon radical; andn 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.