High refractive index thermoplastic polyphosphonates
AssigneesEssilor International (Compagnie Generale d'Optique), Virginia Tech Intellectual Properties, Inc.
InventorsVenkat Sekharipuram, Hosadurga K. Shobha, James E. McGrath, Atul Bhatnagar
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Abstract
High refractive index, melt processable polyphosphonates and methods for preparing the same are provided. These polymers are particularly useful for optical and ophthalmic parts, such as lenses. A method of preparing optical and ophthalmic lenses by injection molding the polymers of the present invention into the form of the optical or ophthalmic lenses is also provided.
Claims1
A method for preparing an optical or opthalmic lens, said method comprising injection molding into the form of said lens, a melt-processable phosphonate homopolymer or copolymer having units of the formula:
- wherein R11, R12, and R13 independently are O or S;
- R14 is a linear or branched C1–C4 alkyl or C1–C4 haloalkyl, phenyl, chlorophenyl, p-tolyl, benzyl, biphenyl, or cyclohexyl;
- and R15 is
Dependencies are inferred from the claim text.