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US 11,204,445 B2Granted
Ophthalmic lens comprising an encapsulated light-absorbing additive
AssigneeEssilor International
InventorsPierre Fromentin, Tipparat Lertwattanaseri, Waranya Phompan, Sanya Hokputsa
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Abstract
The present invention relates to an ophthalmic lens which efficiently absorbs light rays comprising a composition derived from a monomer or oligomer, a catalyst, at least one light-absorbing additive contained in nanoparticles which are dispersed in said monomer or oligomer.
Claims14
An ophthalmic lens comprising a composite substrate comprising:
- a matrix obtained by polymerization of at least one allyl or non-allyl monomer or oligomer in presence of a catalyst for initiating the polymerization of said monomer or oligomer;
- and
- nanoparticles containing at least one light absorbing additive, said nanoparticles being such that active reactants involved in the polymerization of the matrix are not able to diffuse to the internal part of the nanoparticles and said nanoparticles being dispersed in said matrix wherein:
- the nanoparticles encapsulate a light-absorbing additive;
- and
- the light-absorbing additive is not a photochromic dye.
3 more elements
Dependencies are inferred from the claim text.