Patent ID: 7767304

Claim:
A process for obtaining a polythiourethane polarized article comprising: positioning a polarized polyvinyl alcohol film in a molding cavity of a two part mold assembly; pouring in the molding cavity a polymerizable composition comprising: (a) at least one poly(iso)thiocyanate monomer and at least one polythiol; or (b) a mixture of at least one liquid NCO- or NCS-terminated poly(thio)urethane prepolymer and at least one liquid SH-terminated poly(thio)urethane prepolymer; curing the polymerizable composition; and removing the polythiourethane polarized article from the molding cavity, wherein the polarized polyvinyl alcohol film has been dried at a temperature ranging from 25° C. to 100° C. before pouring the polymerizable composition in the molding cavity.