Patent ID: 7393623

Claim:
A method for producing an optical disc, comprising: selecting a formulation comprising a photocurable base material cured by exposure to ultraviolet (UV) light corresponding to a first set of wavelengths, at least one set of photoacid generators (PAGS) responsive to ultraviolet (UV) marking light corresponding to a second set of wavelengths substantially distinct from the first set of wavelengths, and a material that changes that changes its light absorption characteristics in response to a change of pH to form at least one marking is adapted for forming at least one marking upon exposure to a source of marking light, wherein the marking light is ultraviolet light corresponding to the second set of wavelengths, wherein the first layer is comprised of hexanediol diacrylate; triphenylsulfonium triflate and a color former; applying the formulation in at least a portion of a first layer of the optical media; curing the first layer; forming the at least one marking by exposure to marking light having wavelengths in the second set of wavelengths; wherein the marking, when formed, appears in at least a readout area of the optical media and is substantially non-interfering with a readout light for the optical media, wherein said formulation is sensitive to only ultraviolet (UV) light, wherein the optical media is capable of storing data; applying a second layer onto the first layer, wherein the second layer is comprised of a crosslinkable silicone polyether acrylate; tris (2-hydroxy ethyl) isocyanurate triacrylate; and a difunctional bisphenol A based epoxy acrylate; and curing the second layer.