High refractive index thermoplastic polyphosphonates
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.
1. A phosphonate copolymer comprising
(a) a first unit having the formula
wherein R 16 , R 17 , and R 18 are independently O or S; R 19 is phenyl; and R 20 is
(b) a second unit having the formula
wherein R 21 , R 22 , and R 23 are independently O or S; R 24 is phenyl; and R 25 is
2. An optical or ophthalmic lens, said lens comprising a melt-processable phosphonate copolymer comprising
(a) a first unit having the formula
wherein R 16 , R 17 , and R 18 are independently O or S; R 19 is phenyl; and R 20 is
(b) a second unit having the formula
wherein R 21 , R 22 , and R 23 are independently O or S; R 24 is phenyl; and R 25 is