Process for manufacturing light absorbing polymer matrix
AssigneeEssilor International
InventorsJohn Biteau, Ronald Berzon, Pierre Fromentin
Life of this patent
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Abstract
An ophthalmic lens comprising a transparent polymer matrix and core shell nanoparticles which are dispersed in the transparent polymer matrix, wherein the core of core shell nanoparticles results from polymerization of a composition comprising nanoparticle core precursors and at least one photochromic compound, and the shell of core shell nanoparticles comprises a mineral compound.
Claims17
An ophthalmic lens comprising a transparent polymer matrix and core-shell nanoparticles which are dispersed in the transparent polymer matrix, wherein:
- the core of the core-shell nanoparticles results from polymerization of a composition comprising nanoparticle core precursors and at least one photochromic compound;
- and
- the shell of the core-shell nanoparticles comprises a mineral compound;
- wherein the core of the core-shell nanoparticles comprises the at least one photochromic compound embedded within the core, wherein the amount of the at least one photochromic compound in the core-shell nanoparticles is from 0.0001 to 90 wt % based on the total weight of the core-shell nanoparticles;
- wherein the nanoparticle core precursors comprise an alkylalkoxysilane monomer further defined as tetraethyloxysilane (TEOS), tetramethyloxysilane (TMOS), methyltriethoxysilane (MTES), dimethyldiethoxysilane (DMDES), or a mixture thereof and/or an organically modified alkoxysilane monomer further defined as epoxysilane, epoxydialkoxysilanes, epoxytrialkoxysilanes, aminosilanes, or a mixture thereof;
- and
- wherein the amount of the core-shell nanoparticles in the transparent polymer matrix is from 0.001 to 2 wt % based on the weight of the transparent polymer matrix.
A process of preparation of an ophthalmic lens, comprising the steps of:
- a) providing nanoparticle core precursors comprising an alkylalkoxysilane monomer further defined as tetraethyloxysilane (TEOS), tetramethyloxysilane (TMOS), methyltriethoxysilane (MTES), dimethyldiethoxysilane (DMDES), or a mixture thereof and/or an organically modified alkoxysilane monomer further defined as epoxysilane, epoxydialkoxysilanes, epoxytrialkoxysilanes, aminosilanes, or a mixture thereof mixed with a photochromic compound, wherein an amount of the at least one photochromic compound in the core-shell nanoparticles is from 0.0001 to 90 wt % based on the total weight of the core-shell nanoparticles;
- b) polymerizing the nanoparticles core precursors so as to obtain nanoparticle cores encapsulating said photochromic compound;
- c) forming a mineral shell on the nanoparticle cores encapsulating said photochromic compound so as to obtain core-shell nanoparticles encapsulating said photochromic compound;
- d) providing a polymerizable transparent polymer matrix precursor;
- e) mixing the transparent polymer matrix precursor and the core-shell nanoparticles;
- f) curing the mixture obtained at step e) so as to obtain transparent polymer matrix in which are dispersed core-shell nanoparticles encapsulating said photochromic compound, wherein an amount of the core-shell nanoparticles in the transparent polymer matrix is from 0.001 to 2 wt % based on the weight of the transparent polymer matrix.
Dependencies are inferred from the claim text.