Method of imparting impact resistance to a plastic...

G - Physics – 02 – B

Patent

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G02B 1/10 (2006.01) G02C 7/02 (2006.01)

Patent

CA 2211141

A method is disclosed for imparting impact resistance to a plastic ophthalmic lens. The method consists of applying a coating of a multifunctional acrylate in a solvent mixture to the back surface of the lens, and curing the multifunctional acrylate to form an impact resistance imparting coat. The multifunctional acrylate preferably has at least about 40 % by weight of a difunctional acrylate. The multifunctional acrylate preferably has a glass transition temperature less than about 60 °C. Lenses with an impact resistance imparting coat on the back, and an abrasion resistant coat on at least the front of the lens, are also disclosed.

Procédé conférant une résistance à l'impact à des lentilles oculaires en plastique, consistant à appliquer un revêtement d'acrylate multifonctionnel dans un mélange de solvants sur la surface dorsale de la lentille puis à laisser durcir l'acrylate de sorte qu'une couche conférant la résistance à l'impact soit formée. Ledit acrylate qui comporte de préférence environ 40 % en poids d'un diacrylate bifonctionnel présente une température de transition vitreuse inférieure à 60 DEG C. Sont également présentées des lentilles dont la surface dorsale présente un revêtement lui conférant une résistance à l'impact et dont au moins la surface frontale est enduite d'une couche résistant à l'abrasion.

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