Patent ID: 8853323

Claim:
A copolymer comprising at least two repeat units of Formula I: each R 1 is independently an alkyl, haloalkyl, aralkyl, alkenyl, aryl, or aryl substituted with an alkyl, alkoxy, or halo; each Y is independently an alkylene, aralkylene, or a combination thereof; G is a divalent residue equal to a diamine of formula R 3 HN-G-NHR 3 minus the two —NHR 3 groups; R 3 is hydrogen or alkyl or R 3 taken together with G and to the nitrogen to which they are both attached form a heterocyclic group; n is independently an integer of 0 to 1500; and p is an integer of 1 to 10, and wherein the copolymer refractive index is from 1.41 to 1.50.