POLYSILOXANE PREPOLYMERS FOR BIOMEDICAL DEVICES

摘要

A polysiloxane prepolymer that is useful for forming biomedical devices comprises blocks (I) and (II) and is terminated at each end with an ethylenic unsaturated radical: (*Dii*Diol*Dii*PS)<SUB>x</SUB> (I) (*Dii*PS)<SUB>y</SUB> (II) wherein: each Dii is independently a diradical residue of a diisocyanate; each Diol is independently a diradical residue of a diol having 1 to 10 carbon atoms; each PS is independently a diradical residue of a polysiloxane-containing diol or diamine; each * is independently -NH-CO-NH-, -NH-COO- or -OCO-NH-: x represents the number of blocks (I) and is at least 2, and y represents the number of blocks (II) and is at least 1.