Durable high index nanocomposites for AR coatings
First Claim
1. A UV curable optical coating comprising:
- a polymerizable mixture comprising monomer, oligomer, and mixtures thereof; and
surface modified inorganic nanoparticles comprising a majority of surface modified zirconia nanoparticles having an average cross-sectional diameter of about 10 to 30 nanometers and 10 wt-% to 33 wt-% of the total nanoparticles of inorganic nanoparticles having an average cross-sectional diameter of about 80 to 150 nanometers, wherein said optical coating has a refractive index of at least 1.6.
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Abstract
The present invention includes ultraviolet curable compositions preferably containing discrete, crystalline zirconia nanoparticles with reactive, or copolymerizable, surface modification, in a polymerizable monomer/oligomer resin mixture. It is believed that copolymerizable surface modification provides a functional group that enables the functionalized particle to co-polmerize with the reactive monomers, oligomers, and crosslinkers in the formulation. Relative to surface modification of the nanoparticles, acrylate functionality is preferred over methacrylate functionality. On the other hand, methacrylate functionality is preferred over non-reactive, or nonpolymerizable, functionality. As the nanocomposite cures, the resultant network is heavily crosslinked by selection of raw materials with substantial acrylate functionality.
63 Citations
32 Claims
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1. A UV curable optical coating comprising:
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a polymerizable mixture comprising monomer, oligomer, and mixtures thereof; and surface modified inorganic nanoparticles comprising a majority of surface modified zirconia nanoparticles having an average cross-sectional diameter of about 10 to 30 nanometers and 10 wt-% to 33 wt-% of the total nanoparticles of inorganic nanoparticles having an average cross-sectional diameter of about 80 to 150 nanometers, wherein said optical coating has a refractive index of at least 1.6. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A coated article comprising:
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a polymeric substrate; a hard coat layer coupled to the polymeric substrate; a high refractive index optical layer coupled to the hard coat layer; and an optional low refractive index optical layer coupled to the high refractive index optical layer, wherein said high refractive index optical layer comprises a bimodal system of functionalized zirconia nanoparticles comprising a majority of nanoparticles sized to about 10-30 nanometers and a minority of nanoparticles sized to about 80-150 nanoparticles. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. An optical article comprising:
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a polymeric substrate; and a hard coat layer fixed to the polymeric substrate, said hard coat layer having a refractive index of at least 1.6; wherein said hard coat layer comprises a bimodal system of functionalized inorganic nanoparticles comprising surface modified zirconia nanoparticles, wherein a majority of nanoparticles are sized to about 10-30 nanometers and 10 wt-% to 33 wt-% of the total nanoparticles are sized to about 80-150 nanoparticles. - View Dependent Claims (22, 23, 24, 25)
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26. A composition containing:
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a polymerizable mixture comprising monomer, oligomer, and mixtures thereof; and surface modified inorganic nanoparticles comprising surface modified zirconia nanoparticles defined by a polydispersity ranging from about 0.4 to about 0.8 and a z-average mean of about 20 to 80 dispersed within said mixture. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification