US 2007/0179224 A1 · Ophthalmic Lenses Comprising a Photodegradation Protection Coating and a Process for Producing Such Lenses

Abstract

The present invention relates to an optical article, in particular an ophthalmic lens comprising a substrate, a coating that includes at least one photodegradation-sensitive dye, and a photodegradation protection (anti-UV) coating for protecting the coating containing at least one photodegradation-sensitive dye, the photo-degradation protection coating comprising a blend of acrylate oligomers and monofunctional or multifunctional acrylate monomers, at least one UV absorber and at least one photoinitiator. This anti-UV coating used is particularly suitable for an ophthalmic lens in which the polarizing function is provided by a bilayer system, one layer of which comprises liquid crystals combined with dyes, and more particularly dichroic dyes. Advantageously, the anti-UV coating according to the invention is combined with an oxygen barrier layer.

Claims32

Dependent claims

An optical article comprising:

a substrate;
a coating containing at least one photodegradation-sensitive dye;
and
a photodegradation protection coating (anti-UV) for protecting the coating containing at least one photodegradation-sensitive dye,
the photodegradation protection coating resulting from the photopolymerization of a mixture comprising:
(i) a blend of monofunctional or multifunctional acrylate monomers and acrylate oligomers;
(ii) from 5 wt % to 30 wt %, relative to the sum of (i), (ii) and (iii), of at least one UV absorber;
and
(iii) from 3 wt % to 12 wt %, relative to the sum of (i), (ii) and (iii), of at least one photoinitiator.

6 more elements

A process for manufacturing an optical article as defined in any one of the preceding claims, comprising the following steps:

deposition of a coating containing at least one photodegradation-sensitive dye on a bare substrate or on a substrate coated with at least one layer of varnish;
optionally, surface treatment of the coated substrate obtained, preferably chemical surface treatment;
deposition of the photodegradation protection coating by spin coating;
and
photopolymerization of the said photodegradation protection coating.

2 more elements

Dependencies are inferred from the claim text.

Ophthalmic Lenses Comprising a Photodegradation Protection Coating and a Process for Producing Such Lenses

Life of this patent

Ophthalmic Lenses Comprising a Photodegradation Protection Coating and a Process for Producing Such Lenses

Life of this patent

Abstract

Claims32