Optical article coated with an antireflection or reflective coating comprising an electrically conductive film based on tin oxide, and production method
View Patent ↗This invention relates to an optical article having antistatic and antireflection or reflective properties, comprising a substrate having at least one main surface coated with an antireflection or reflective coating, said coating comprising at least one electrically conductive layer comprising at least 30% tin oxide (SnO 2 ) by weight relative to the total weight of the electrically conductive layer, said electrically conductive layer having been deposited by ion-assisted deposition, and said substrate having a water uptake rate equal to or greater than 0.6% by weight relative to the total weight of said substrate, the water uptake rate being measured after predrying said substrate and then storing it for 800 hours in a chamber at 50° C. under 100% relative humidity and at atmospheric pressure.
1. An optical article having antistatic and antireflection or reflective properties, comprising a substrate having at least one main surface coated with an antireflection or reflective coating comprising at least one electrically conductive layer, wherein:
the electrically conductive layer comprises at least 30% tin oxide (SnO 2 ) by weight relative to the total weight of the electrically conductive layer;
the electrically conductive layer has been deposited under ionic assistance; and
the substrate has a water uptake rate equal to or greater than 0.6% by weight relative to total weight of the substrate.
2. The optical article of claim 1 , wherein the electrically conductive layer comprises at least 40% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer.
3. The optical article of claim 2 , wherein the electrically conductive layer comprises at least 50% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer.
4. The optical article of claim 1 , wherein the thickness of the electrically conductive layer ranges from 0.1 to 150 nm.
5. The optical article of claim 4 , wherein the thickness of the electrically conductive layer ranges from 1 to 20 nm.
6. The optical article of claim 1 , wherein the electrically conductive layer does not contain indium.
7. The optical article of claim 1 , wherein the electrically conductive layer comprises at least 90% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer.
8. The optical article of claim 1 , wherein the electrically conductive layer consists of a SnO 2 layer.
9. The optical article of claim 1 , wherein the electrically conductive layer does not form an outer layer of the antireflection or reflective coating in the stack order.
10. The optical article of claim 1 , wherein the electrically conductive layer forms a penultimate layer of the antireflection or reflective coating in the stack order.
11. The optical article of claim 1 , wherein the substrate is made of poly(thiourethane) or results from polymerization or copolymerization of alkylene glycol bis allyl carbonates.
12. The optical article of claim 1 , wherein the antireflection or reflective coating is a multilayer coating, comprising alternating high refractive index layers and low refractive index layers.
13. The optical article of claim 1 , further defined as an ophthalmic lens.
14. The optical article of claim 1 , wherein the antireflection or reflective coating comprises at least one layer comprising a mixture of SiO 2 and Al 2 O 3 , and deposition of this layer has been performed in a vacuum chamber while supplying gas into the chamber during the deposition.
15. The optical article of claim 14 , wherein the pressure in the vacuum chamber during the gas supply ranges from 5.10 −5 to 3.10 −4 mbar.
16. A method for manufacturing the optical article of claim 1 , comprising:
providing an optical article comprising a substrate having at least one main surface, the substrate having a water uptake rate equal to or greater than 0.6% by weight relative to the total weight of the substrate;
depositing under ionic assistance onto the substrate's main surface an antireflection or reflective coating, the coating comprising at least one electrically conductive layer comprising at least 30% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer; and
obtaining an optical article comprising a substrate with a surface coated with the antireflection or reflective coating comprising the electrically conductive layer.
17. The method of claim 16 , wherein the electrically conductive layer comprises at least 40% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer.
18. The method of claim 17 , wherein the electrically conductive layer comprises at least 50% tin oxide (SnO 2 ) by weight relative to total weight of the electrically conductive layer.
19. The method of claim 16 , wherein the depositing comprises evaporation under vacuum.
20. The method of claim 16 , wherein the optical article is substantially free of cosmetic defects.