Patent ID: 7098290

Claim:
A method of preparing a polymerizate comprising the step of polymerizing a two-component composition comprised of: (a) a first component containing at least one reactant having at least two functional groups selected from isocyanate, isothiocyanate or combinations thereof, the reactant being the reaction product of, (i) a polythiol monomer having at least two thiol groups; and (ii) a monomer having at least two functional groups selected from isocyanate, isothiocyanate or combinations thereof; and (b) a second component containing at least one polyamine reactant having at least two functional groups selected from primary amine, secondary amine or combinations thereof; wherein the molar equivalent ratio of (NCO+NCS) groups from said first component to (—NH 2 +—NH—) groups from said second component is from 0.5 to 100, wherein said first component and said second component are selected such that when they are polymerized, the resulting polymerizate has a refractive index of at least about 1.57, an Abbe number of at least about 30, and an initial Barcol hardness of at least 1.