Method for treating a lens apt to trimming

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 17/34 (2006.01) C03C 17/42 (2006.01)

Patent

CA 2495274

A method for treating an ophthalmic lens comprising two main sides, wherein at least one side comprises an organic or mineral external layer coated with a MgF2 temporary protective layer, said method comprising a specific treating step selected amongst the following steps: - a liquid phase chemical treatment of the temporary protective layer, leading to the formation of MgO and/or Mg(OH)2 on the temporary protective layer,- a deposit of at least one non fluorinated metallic oxide and/or of at least one non fluorinated metallic hydroxide on the temporary protective layer through transfer thereof from an electrostatic film or through vacuum evaporation thereof directly on the temporary protective layer,- the deposit of the MgF2 temporary protective layer on the external layer occurs through vacuum evaporation at a speed lower than or equal to 0.5 nm/s.

L'invention concerne un procédé pour traiter une lentille ophtalmique comprenant deux côtés principaux, au moins un des côtés comprenant une couche externe organique ou minérale recouverte par une couche de protection temporaire de MgF¿2?. Ledit procédé comprend une étape de traitement spécifique sélectionnée parmi les étapes suivantes : un traitement chimique en phase liquide de la couche de protection temporaire, permettant de former du MgO et/ou du Mg(OH)¿2? sur ladite couche de protection ; un dépôt d'au moins un oxyde métallique non fluoré et/ou d'au moins un hydroxyde métallique fluoré sur la couche de protection temporaire, au moyen du transfert d'un film électrostatique ou au moyen d'une évaporation sous vide effectuée directement sur la couche de protection temporaire ; le dépôt de la couche de protection temporaire de MgF¿2? sur la couche supérieure est effectué par évaporation sous vide à une vitesse inférieure ou égale à 0.5 nm/s.

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