Coated optical articles
A coated optical article includes: an optical substrate; a first coating layer applied directly over at least a portion of an optical substrate, the first coating layer formed from a first coating composition including an aqueous medium and keto and/or aldo functional polymeric materials that are dispersed in the aqueous medium; and a second coating layer applied directly over at least a portion of the first coating layer, the second coating layer including a sol-gel and which is formed from a second coating composition. The first coating composition and second coating composition are each independently substantially free of hydrazine and hydrazide functional components.
1 . A coated optical article comprising:
an optical substrate;
a first coating layer applied directly over at least a portion of the optical substrate, the first coating layer formed from a first coating composition comprising an aqueous medium and keto and/or aldo functional polymeric materials dispersed in the aqueous medium; and
a second coating layer applied directly over at least a portion of the first coating layer, the second coating layer comprising a sol-gel and which is formed from a second coating composition comprising a sol,
wherein the first coating composition and second coating composition are each independently substantially free of hydrazine and hydrazide functional components; and wherein the keto and/or aldo functional polymeric materials are present in the first coating composition in an amount of at least 50 weight %, based on the total solids weight of the first coating composition.
2 . The coated optical article of claim 1 , wherein the keto and/or aldo functional polymeric materials comprise core-shell particles comprising keto and/or aldo functional groups that are dispersed in the aqueous medium, in which the core-shell particles comprise (a) a polymeric core at least partially encapsulated by (b) a polymeric shell, wherein at least a portion of the polymeric shell is covalently bonded to at least a portion of the polymeric core.
3 . The coated optical article of claim 2 , wherein the polymeric shell of the first coating composition comprises urethane and/or urea linkages.
4 . The coated optical article of claim 2 , wherein the polymeric shell of the first coating composition comprises carboxylic acid functional groups.
5 . The coated optical article of claim 2 , wherein the polymeric core comprises an addition polymer derived from ethylenically unsaturated monomers comprising a (meth)acrylate monomer, a vinyl monomer, or a combination thereof.
6 . The coated optical article of claim 2 , wherein the keto and/or aldo functional groups of at least some of the core-shell particles are formed on the polymeric shell.
7 . The coated optical article of claim 6 , wherein the core-shell particles of at least some of the core-shell particles are formed from a mixture of reactants comprising:
ethylenically unsaturated monomers;
a polyurethane prepolymer comprising an isocyanate functional group and an ethylenically unsaturated group; and
a Michael addition reaction product of an ethylenically unsaturated monomer comprising keto and/or aldo functional groups, and a compound comprising at least two amino groups.
8 . The coated optical article of claim 2 , wherein the keto and/or aldo functional groups of at least some of the core-shell particles are formed on the polymeric core.
9 . The coated optical article of claim 8 , wherein the core-shell particles of at least some of the core-shell particles are formed from a mixture of reactants comprising:
ethylenically unsaturated monomers, wherein at least some of the ethylenically unsaturated monomers comprise keto and/or aldo functional groups; and
a polyurethane prepolymer comprising an isocyanate functional group and an ethylenically unsaturated group.
10 . The coated optical article of claim 1 , wherein the first coating composition further comprises a refractive index modifier.
11 . The coated optical article of claim 10 , wherein the refractive index modifier comprises a metal oxide.
12 . The coated optical article of claim 10 , wherein the refractive index modifier comprises up to 65 weight % of the first coating composition, based on the total solids weight of the first coating composition.
13 . The coated optical article of claim 1 , wherein the sol of the second coating composition comprises an alkoxysilane and a protic acid.
14 . The coated optical article of claim 13 , wherein the alkoxysilane is partially hydrolyzed.
15 . The coated optical article of claim 13 , wherein the sol of the second coating composition further comprises a metal oxide.
16 . The coated optical article of claim 13 , wherein the sol of the second coating composition further comprises a metal alkoxide.
17 . The coated optical article of claim 13 , wherein the sol of the second coating composition further comprises a polyglycidyl ether.
18 . The coated optical article of claim 1 , wherein the optical substrate comprises poly(meth)acrylate, TAC (triacetate cellulose), DAC (diacetate cellulose), poly-allyldiglycol carbonate (ADC), nylon, polyamide, polyurethane (urea) polymers, polyethylene terephthalate, polycarbonate, sulfur-containing polyurethane, sulfur-containing polyurethane (urea), or any combination thereof.
19 . The coated optical article of claim 1 , wherein the optical article is an optical lens, an optical filter, a window, a visor, a mirror, or a display.
20 . The coated optical article of claim 1 , wherein the optical article is an ophthalmic lens.