Patent ID: 7923520

Claim:
A high refractive index monomer according to formula (I): wherein: R 1 is H or CH 3 ; X is O or S; R 2 is independently H or linear or branched C 1 -C 6 alkyl; n=3 to 10; m=1- 10; R 3 is linear or branched C 1 -C 3 alkylene; Y is O or S; p=0- 5; R 4 is C 6 -C 18 aryl or heteroaryl; q is 2 or 3; o is 0 or 1; when q=2, then o is 1; when q=3; then o is 0; and R 5 is independently H or linear or branched C 1 -C 6 alkyl.