Patent ID: 7074873

Claim:
A method of producing an ophthalmic device using a polymeric composition, said method comprising: casting said polymeric composition in the form of a rod; lathing or machining said rod into disks; and lathing or machining said disks into an ophthalmic device; wherein said polymeric composition comprises a copolymer of: (a) one or more aromatic monomers, alkyl monomers, hydrophilic monomers, or a combination thereof; and (b) a prepotymer having a formula of wherein the V groups are the same or different unsaturated photo or thermal polymerizable substituents of the general structure R 3 CHâ•C(R 4 )(CH 2 ) p (W) q (Z) q (Ar) q R 5 ; the R groups are the same or different saturated C 1-10 hydrocarbon substituents; the R 1 groups are the same or different C 1-10 alkyl substituents; the R 2 groups are the same or different selected from the group consisting of C 1-10 alkyl substituents, C 1-10 fluoroalkyl substituents, C 2-20 alkyl-fluoroalkyl substituents and C 6-30 aromatic substituents the L groups, which are absent or present, where present are the same or different urethane, urea, carbonate or ester linkages; y is a natural number greater than 4 representing the sum of siloxane moieties with randomly differing R 2 groups as defined above so as to have a molar ratio of aromatic substltuents to alkyl substituents no less than 1:4; x is a natural number such that the prepolymer molecular weight is at least approximately 1000 and refractive index is at least approximately 1.45; R 3 is selected from the group consisting of hydrogen, C 1-10 alkyl and â€”COâ€”U; R 4 is selected from the group consisting of hydrogen and methyl; R 5 is a C 1-10 divalent alkylene radical; the W group is selected from the group consisting of â€”COâ€” and â€”OCOâ€”; the Z group is selected from the group consisting of â€”Oâ€” and â€”NHâ€”; the Ar groups are the same or different C 6-30 aromatic radicals; p is a non-negative integer less than 7; q is either 0 or 1; and U is selected from the group consisting of â€”OC 1-12 alkyl radical, â€”SC 1-12 alkyl radical and â€”NHC 1-12 alkyl radical.