Patent ID: 7271283

Claim:
A high refractive index monomer, comprising: a compound according to formula (I) wherein Z is an ethylenically unsaturated group; X is O, S, or NH; L 1 and L 2 are each independently C 1 -C 3 alkylene, —(C 1 -C 3 alkylene)-S—(C 1 -C 3 alkylene)-, or —(C 1 -C 3 alkylene)-O—(C 1 -C 3 alkylene)-; R is hydrogen or C 1 -C 6 alkyl; R 1 and R 2 are each independently N-containing heteroaryl, or N-containing heteroaryl(C 1 -C 6 alkylene)-, each of which group is substituted with 0 to 5 substituents independently chosen from halogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, (C 1 -C 4 alkyl)S—, C 1 -C 4 haloalkyl, and C 1 -C 4 haloalkoxy; and Y 1 and Y 2 are each independently O, S, NH.