Abstract:
An impact-resistant primer coating composition comprising: - at least one non-hydrophilic acrylate monomer; - at least one epoxy monomer; and - at least one photoactivable cationic catalyst.
Abstract:
A method for forming a coated optical article comprising the steps of : (a) providing a two-part mold having opposed optical surfaces defining therebetween a molding cavity; (b) forming successively, on at least one of the optical surfaces of the mold, an anti-reflecting coating, a scratch-resistant coating and an impact-resistant primer coating; (c) filling the molding cavity with an optical substrate, liquid, curable composition; (d) curing the liquid curable composition, and (e) disassembling the two-part mold for recovering a coated optical article comprising an optical substrate having deposited and adhered on at least one of its faces, an impact-resistant primer coating, a scratch-resistant coating and an anti-reflecting coating.
Abstract:
The invention relates to a method for forming from a mold optical articles. These methods are particularly useful in preparing ophthalmic articles such as ophthalmic lenses, having several optical coatings thereon. The invention also relates to ophthalmic articles produced by these methods.
Abstract:
Procedimiento de acabado de una superficie de una lente oftálmica, para una prescripción dada, que comprende la etapa de selección de dicha lente oftálmica cuya superficie se mecaniza caracterizado porque dicha superficie presenta una rugosidad media aritmética Ra inferior a 0,5 μm y porque se aplica en la superficie una capa de barniz con un espesor comprendido entre 30 Ra y 800 Ra aproximadamente, donde Ra es la rugosidad media aritmética de dicha superficie, para conferirle un estado de superficie pulido, utilizando una máquina de aplicación del barniz que comprende un soporte (1001) de la lente que puede ser arrastrada en rotación y un brazo (1003) que lleva una boquilla de distribución (1002) de baja presión del barniz líquido, desplazable en traslación vertical y horizontalmente con respecto al soporte (1001), siendo el barniz depositado en dicha superficie según un desplazamiento de la boquilla del centro hacia el borde o del borde hacia el centro de dicha superficie, con el depósito del barniz realizado a una velocidad de rotación de la lente comprendida entre 300 y 1000 vueltas/min, con la capa de barniz obtenida por endurecimiento de un compuesto líquido de barniz con una viscosidad a 25ºC comprendida entre 1000 y 3000 mPas aproximadamente.
Abstract:
The invention relates to a method for forming from a mold optical articles. These methods are particularly useful in preparing ophthalmic articles such as ophthalmic lenses, having several optical coatings thereon. The invention also relates to ophthalmic articles produced by these methods.
Abstract:
The coating composition according to the invention comprises:(A) a component which is the reaction product with oxalic acid of at least one organometallic compound of formula:wherein, M is a metal R is H or an alkyl radical, R is a chelating ligand, x is the valency of the metal, y is an integer at least equal to 1 and x-y is at least equal to 1; and(B) at least one organoalkoxysilane of formula:wherein, R is an alkyl radical, R is an epoxidized alkyl group and n is an integer from 1 to 3 or a mixture of the organoalkoxysilane of formula (II) with an alkoxysilane of formula (II')wherein n' is an integer from 0 to 3,R'' is H, an alkyl radical or an alkoxyalkyl radical, andR' is a vinyl, (meth)acryl, aromatic, cyclic or aliphatic alkyl radical.