Patent ID: 7226719

Claim:
A coating formulation for a reactive dye layer for a limited-play optical storage medium, said formulation comprising: (a) at least one polymeric polyhydroxy compound selected from the group consisting of branched polyhydroxystyrene homopolymers, polyhydroxystyrene copolymers prepared by polymerizing a 4-hydroxystyrene derivative with at least one olefin co-monomer, and cellulose derivatives; (b) at least one polymeric carrier selected from the group consisting of thermoplastic acrylic polymers, polyester resins, epoxy resins, polythiolenes, UV curable organic resins, polyurethanes, thermosettable acrylic polymers, alkyds, vinyl resins, and combinations thereof; and (c) at least one reactive material selected from the group consisting of oxygen sensitive leuco methylene blue, brilliant cresyl blue, basic blue 3, toluidine 0, combinations comprising at least one of the foregoing reactive materials, and protected forms of any of the foregoing reactive materials.