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Abstract

A polysiloxane copolymer that is useful for forming biomedical devices comprises blocks (I) and (II) and is terminated at each end with an ethylenically unsaturated radical: (*Dii*Diol*Dii*PS).sub.x (I) (*Dii*PS).sub.y (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.

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First Claim