Patent ID: 8848288

Claim:
A composite optical article comprising: (a) a polymeric base layer comprising a sulfur-containing urethane-based material having a refractive index of at least 1.57, wherein the sulfur-containing urethane-based material comprises the reaction product of the following components: (A) a polyisocyanate; (B) a thioether-functional, oligomeric polythiol prepared by reacting together: (1) a compound having at least two thiol functional groups; (2) a compound having triple bond functionality; and optionally, (3) a compound having at least two double bonds; and, optionally, (C) a compound different from (B) containing active hydrogens; and (b) a polymeric outer layer cast over a surface of the base layer (a) comprising (i) a poly(urea-urethane) material having a refractive index of less than 1.57, and (ii) a photochromic compound and/or a static dye, wherein the thickness of the base layer (a) is greater than the thickness of the outer layer (b), and wherein the thickness of the outer layer (b) ranges from 0.5 millimeter to 1.0 millimeter.