Abstract:
Systems for transferring at least one coating from a carrier to a surface of an optical article which comprise: an optical article to be coated; a flexible carrier bearing at least one coating to be transferred; an inflatable membrane; and a deformable part that is able to match the geometry of a surface of the optical article when a pressure is exerted on the optical article through inflation of the inflatable membrane. Also describes are methods and processes of using such systems; carriers for use in such systems, methods, and processes; and optical articles made using such systems, methods, and processes.
Abstract:
The present method for coating a Fresnel lens blank comprises providing an uncoated Fresnel lens blank (10) having a structure surface (13) and a non- structured surface (12), providing a transparent mold part (14) having molding surface substantially matching the base curvature of the Fresnel lens, depositing a metered quantity of coating resin (17) between the molding surface and the structured surface of the Fresnel lens, applying pressure between the Fresnel lens and the mold part while maintaining the distance between the molding surface and the structure surface so that the thickness of the coating is greater than 1.5 times the Fresnel structural height of the structured surface and less than 5 times of the Fresnel structure height of the structured surface and curing the resin coating in situ by directing the incident UV radiation at the Fresnel lens. A double coating may be employed for obtaining both higher optical power and better mechanical properties.
Abstract:
Method for fabricating a Fresnel lens or other lens having a structured surface such as refractive and/or diffractive bi-focal or other multi-focal lenses includes press-coating the structured surface with a low or very low refractive index coating material. The coating is sufficient thick to adequately cover the structured surface so that a smooth coating surface with good optical properties is obtained, in the case of a Fresnel structure a thickness greater than 1.5 times and less than 5 times the Fresnel structure height, and is cured in situ. A film, e.g., of PET, PC or PU or a film stack, e.g. a TAC/PVA/TAC film stack is prepared and a heat melting adhesive is applied to the side of the film or film stack to be brought into contact the coated structured surface of the lens blank. The film or film stack is then laminated to the cured coating.
Abstract:
A method for laminating a film on to an optical article and a bi-layer adhesive for use in the method. The bi-layer adhesive includes a latex adhesive layer or a specific silane adhesive and an HMA layer sequentially disposed on the film and dried to form a solid layer of uniform thinness throughout to provide optical quality. Various types of films may be employed to provide an optical function. Following optional pre-treatment steps, the adhesives are coated on to the film. An optical hot press technique is used to deliver heat and pressure over a short period of time to form a functionally-enhanced optical article with high adhesive strength.
Abstract:
The present invention relates to a process for transferring at least one coating onto at least one geometrically defined surface of a lens substrate. In a preferred embodiment, the transparent adhesive composition is selected from the group consisting of pressure-sensitive adhesives and hot-melt adhesives .
Abstract:
A composition includes: a continuous liquid phase including an acrylic monomer and an epoxy monomer; and a dispersed nanoparticulate including ZrO2 modified with an acrylic silane; and wherein the composition is transparent to visible light when coated on a lens. In addition, a method including the steps of: mixing an acrylic silane and a methanol-based ZrO2 sol to create a methanol-based silane-modified ZrO2 sol; then mixing at least an acrylic monomer, an epoxy monomer, and the methanol-based silane-modified ZrO2 sol to obtain the composition. The composition can be adapted for coating and curing onto another substrate, such as an ophthalmic lens.
Abstract:
Un producto adhesivo óptico y un proceso para producir un producto adhesivo óptico, conjuntos de películas laminados y lentes laminadas; el producto adhesivo óptico incluye una solución acuosa de glioxal en la que se ajusta el pH para su uso como un adhesivo óptico que demuestra una resistencia a la fuerza de desprendimiento húmeda por encima de aproximadamente 6 Newtons; se puede añadir un polímero con base acuosa, tal como el PVOH, al sistema adhesivo; de acuerdo con el proceso, se produce el sistema adhesivo con glioxal y se utiliza para laminar películas de TAC-PVA-TAC juntas para formar un conjunto de películas polar; el conjunto de películas polar se lamina hasta conseguir un sustrato óptico y en el caso de lentes oftálmicas, se trata superficialmente, se recubre y se procesan los bordes; el producto adhesivo óptico evita la separación de las películas en el conjunto de películas de TAC-PAV-TAC polar durante el procesamiento de los bordes.
Abstract:
A process for applying a coated or uncoated film onto at least one surface of a lens substrate which comprises the steps of : (a) providing a lens substrate (1) having main surfaces ; (b) providing a coated or uncoated film (3,4); (c) forming, on either a surface of the coated or uncoated film or one of the said surfaces of the lens substrate, a layer of a dry latex (5); (d) depositing at least one drop of a water base activating liquid (6) on either the said main surface (2) of the lens substrate, a surface of the coated or uncoated film or an exposed surface of the dry latex layer (5); (e) moving relatively to each other the coated or uncoated film and the lens substrate and applying a sufficient force to the coated or uncoated film to spread the water base activating liquid and form a thin pellicule thereof between the dry latex layer (5) and either the lens substrate or the coated or uncoated film (3,4); (f) heating the thin pellicule of water base activating liquid and the dry latex layer (5); (g) releasing the applied force; and (h) recovering the lens substrate (1) with the coated or uncoated film (3,4) adhered to the lens substrate main surface.
Abstract:
A process for applying a coated or uncoated film onto a surface of a lens substrate which comprises the steps of : providing a liquid hot melt adhesive (HMA) composition comprising: a HMA base polymer and a polymerizable monomer or oligomer applying the liquid HMA composition onto either the surface of a film or a lens substrate drying the applied liquidHMA composition moving the film and the lens substrate relatively to each other to bring them into contact applying pressure on the film; heating to reach a Tmax process Temperature at or above the glass transition temperature (Tg), the monomers or oligomers being liquid at the Tmax process temperature and polymerizing the monomers or oligomers while maintaining pressure and heating.
Abstract:
A process for applying a coated or uncoated film onto at least one surface of a lens substrate which comprises the steps of : (a) providing a lens substrate (1) having main surfaces ; (b) providing a coated or uncoated film (3,4); (c) forming, on either a surface of the coated or uncoated film or one of the said surfaces of the lens substrate, a layer of a dry latex (5); (d) depositing at least one drop of a water base activating liquid (6) on either the said main surface (2) of the lens substrate, a surface of the coated or uncoated film or an exposed surface of the dry latex layer (5); (e) moving relatively to each other the coated or uncoated film and the lens substrate and applying a sufficient force to the coated or uncoated film to spread the water base activating liquid and form a thin pellicule thereof between the dry latex layer (5) and either the lens substrate or the coated or uncoated film (3,4); (f) heating the thin pellicule of water base activating liquid and the dry latex layer (5); (g) releasing the applied force; and (h) recovering the lens substrate (1) with the coated or uncoated film (3,4) adhered to the lens substrate main surface.