HIGH REFRACTIVE INDEX LENSES

摘要

The invention relates to a lens having a refractive index of at least 1.60 which comprises the cured product of a composition comprising an unsaturated compound and a thiol compound comprising at least three thiol groups. Also covered is a process for the manufacture of these lenses either by thermal curing or by photocuring. The lenses have a glass transition temperature of more than 70 DEG C and a satisfactory Barcol hardness and Abbe number.