Fully polymerized UV blocking silicone hydrogel lens

Abstract

A substantially fully copolymerized UV blocking hydrogel lens demonstrating sufficient blocking of UV light to meet at least FDA Class II specifications for UV blocking formed from a reaction mixture comprising at least NVP and one other comonomer and a free-radical polymerizable, substituted or unsubstituted, Bis Omicron-hydroxy benzophenone is provided herein.

Description

technical field [0001] The present invention relates to an ophthalmic device, and more particularly to a process for preparing a substantially fully polymerized UV-blocking hydrogel lens comprising incorporating at least one (NVP), one additional comonomer and monomer mixtures of free radically polymerizable substituted or unsubstituted di-ortho-hydroxybenzophenones are polymerized to provide a surface that has a wettability and is sufficiently UV-blocking to meet at least Class II specifications for UV-blocking Hydrogel Ophthalmic Devices. Background technique [0002] The development of commercially successful ophthalmic devices formed from traditional silicone hydrogel materials often requires post-curing of the resulting wettable surfaces. Traditional silicone hydrogel contact lenses can exhibit superficialization of silicone chains, ie, silicone-rich microdomains reside on the lens surface. Surfaceization of the siloxane chains creates hydrophobic regions on the lens ...

AI Technical Summary

Problems solved by technology

Differences in the reaction mechanisms of device-forming systems and hence Differences in reaction kinetics (e.g., addition to C=C vs. hydrogen atom transfer) make such systems particularly susceptible to incomplete cure

Therefore, the relatively sensitive kinetics of the curing reaction in these device-forming systems make it difficult to form successful ophthalmic devices

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