Plasma surface treatment of silicone hydrogel contact lenses...

Details Plasma surface treatment of silicone hydrogel contact lenses... Plasma surface treatment of silicone hydrogel contact lenses...

C - Chemistry, Metallurgy

08

J

C08J 7/04 (2006.01) C08J 7/06 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2373552

The present invention is directed to the surface treatment of silicone hydrogel contact lenses. In particular, the present invention is directed to a method of modifying the surface of a contact lens to increase its hydrophilicity by coating the lens with a carbon-containing layer made from a diolefinic compound having 4 to 8 carbon atoms. In one embodiment, an optically clear, hydrophilic coating is provided upon the surface of a silicone hydrogel lens by sequentially subjecting the surface of the lens to: a plasma oxidation reaction, followed by a plasma polymerization reaction in the presence of a diolefin in the absence of air. Finally, the resulting carbon layer is rendered hydrophilic by a further plasma oxidation reaction or by the attachment of a hydrophilic polymer chain.

L'invention concerne le traitement de surface de lentilles de contact à base d'hydrogel de silicone, et notamment un procédé de modification de la surface d'une lentille de contact, de manière à augmenter l'hydrophilie de cette lentille par revêtement de celle-ci à l'aide d'une couche contenant du carbone et réalisée à partir d'un composé dioléfinique contenant 4 à 8 atomes de carbone. Dans un mode de réalisation, on dépose un revêtement hydrophile, optiquement transparent, sur la surface d'une lentille à base d'hydrogel de silicone, en soumettant la surface de la lentille à des étapes successives consistant en une réaction d'oxydation au plasma, en une réaction de polymérisation au plasma, en présence d'une dioléfine et en l'absence d'air, et enfin, en vue de rendre cette couche de carbone hydrophile, en une autre réaction d'oxydation au plasma, ou en la fixation de chaînes polymères hydrophiles.

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