Patent ID: 7087698

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 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 1.6, an Abbe number of at least 33 and an initial Barcol hardness of at least 1.