Patent ID: 8202392

Claim:
A process for applying a coated or uncoated film onto at least one geometrically defined surface of a lens substrate, comprising: (a) providing a liquid hot melt adhesive (HMA) composition comprising: at least one HMA base polymer having a glass transition temperature Tg; and at least one polymerizable monomer, oligomer or polymer; (b) providing a film having two opposite main surfaces: a first main surface and a second main surface; (c) providing a lens substrate having at least one geometrically defined surface; (d) applying the liquid HMA composition onto either the surface of said film or said at least one geometrically defined surface; (e) drying the applied liquid HMA composition to form a HMA dried layer in contact with said at least one of the main surfaces of said film or said at least one geometrically defined surface of the lens substrate; (f) moving the film and the lens substrate relatively to each other to bring the HMA dried layer into contact with either said at least one geometrically defined surface of the lens substrate or one of said main surfaces of said film; (g) applying a pressure on the film; (h) heating to reach a T max process temperature at or above the glass transition temperature (Tg), but below the melting temperature Tm, if the polymer exhibits a Tm, the monomers or oligomers being liquid at the T max process temperature; (i) polymerizing the monomers, oligomers or polymers, while maintaining pressure and heating; and (j) removing the pressure applied on the carrier, and recovering the lens substrate with the film adherent to said lens substrate main surface.