Composition for the manufacture of an ophthalmic lens comprising an encapsulated light-absorbing additive
AssigneeEssilor International
InventorsPierre Fromentin, Sanya Hokputsa
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Abstract
The present invention relates to a thermosetting composition for the manufacture of an ophthalmic lens which efficiently absorbs light rays without degradation of the light-absorbing additive, said composition comprising an allyl monomer or oligomer, a catalyst, at least one light-absorbing additive contained in nanoparticles which are dispersed in said allyl monomer or allyl oligomer. The present invention also relates to the use of said composition and to the ophthalmic lens obtained from said composition.
Claims15
A polymerizable liquid composition for the manufacture of an ophthalmic lens, comprising:
- a) at least one allyl monomer or allyl oligomer,
- b) at least one catalyst for initiating the polymerization of said allyl monomer or allyl oligomer,
- c) at least one light-absorbing additive not contained in core-shell nanoparticles and homogeneously dispersed in non-core-shell nanoparticles, wherein said non-core-shell nanoparticles are dispersed in said allyl monomer or allyl oligomer.
An ophthalmic lens comprising a composite substrate comprising:
- a) a matrix obtained by polymerization of at least one allyl monomer or allyl oligomer in presence of a catalyst for initiating the polymerization of said allyl monomer or allyl oligomer;
- and
- b) non-core-shell nanoparticles containing at least one light-absorbing additive not contained in core-shell nanoparticles, wherein said at least one light-absorbing additive is homogeneously dispersed in said non-core-shell nanoparticles and said non-core-shell nanoparticles are dispersed in said matrix.
Dependencies are inferred from the claim text.