A process for preparing a photochromic lens

G - Physics – 02 – B

Patent

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G02B 5/23 (2006.01)

Patent

CA 2395668

A process for making a photochromic optical lens is disclosed. In a first embodiment of the process a multi-plied laminate, containing a ply of photochromic thermoplastic polyurethane (herein "TPU") and a ply containing thermoplastic polycarbonate, is first placed in the cavity of a suitable mold. The ply that contains polycarbonate resin is placed facing the cavity. Thermoplastic polycarbonate resin is then injected into the cavity. In a second embodiment, referred to as an over- mold method, polycarbonate is first injection molded into a molding cavity to form a substrate. Photochromic TPU is, in a subsequent step, injected into the cavity to form a superstrate overlay. In both embodiments, the articles thus molded are suitable for the preparation of optical lenses.

L'invention concerne un procédé de fabrication d'un verre optique photochromique. Dans un premier mode de réalisation de ce procédé, dit de moulage à insertion de film, un laminé multicouche, contenant une couche de polyuréthane thermoplastique (TPU) photochromique et une couche contenant du polycarbonate thermoplastique, est d'abord placé dans la cavité d'un moule convenable. La couche contenant la résine de polycarbonate est placée face à la cavité. La résine de polycarbonate thermoplastique est alors injectée dans la cavité. Dans un second mode de réalisation, dit procédé de surmoulage, le polycarbonate est d'abord moulé par injection dans une cavité de moulage afin de former le substrat. Le TPU photochromique est, au cours d'une étape ultérieure, injecté dans la cavité afin de former une couche supérieure. Dans les deux modes de réalisation, les articles ainsi moulés conviennent pour la préparation de verres optiques.

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