Siloxane coating for a display lens assembly for mobile devices
View Patent ↗Hard coatings are applied to a lens assembly. In an embodiment, the coated lens assembly ( 140 ) includes a first layer ( 106 B) including siloxane; a second layer ( 106 A) including siloxane, wherein the second layer has opposing sides and a hardness greater than the first layer; and a third layer ( 104 ) including an amorphous carbon selected from a diamond-like carbon and a diamond-like nano-composite. The first layer ( 106 B) and third layer ( 104 ) are positioned on opposing sides of the second layer ( 106 A). The third layer ( 104 ) has a hardness greater than the second layer ( 106 A).
1. A coating for a substrate comprising:
a siloxane layer comprising a siloxane-organic interpenetrating network contacting the substrate, the siloxane layer having a hardness greater than a hardness of the substrate;
another siloxane layer comprising a siloxane-organic interpenetrating network contacting the siloxane layer, the another siloxane layer having a hardness greater than the hardness of the siloxane layer, the siloxane layer and the another siloxane layer having a combined thickness of at least 20 microns; and
a diamond-like nano-composite layer comprising an amorphous carbon and a siloxane contacting the another siloxane layer, the diamond-like nano-composite layer having a hardness greater than the hardness of the another siloxane layer.
2. The coating of claim 1 , wherein the siloxane layer and the another siloxane layer have a combined thickness of less than 75 microns.
3. The coating of claim 1 , further comprising a hydrophobic treatment layer contacting the diamond-like nano-composite layer.
4. The coating of claim 1 , wherein the amorphous carbon is an amorphous hydrogenated diamond-like carbon.
5. The coating of claim 1 , wherein the diamond-like nano-composite layer has a hardness of 400 Vickers or greater.
6. The coating of claim 1 , wherein the diamond-like nano-composite layer has a thickness between 3 microns and 20 microns.
7. The coating of claim 1 , wherein the diamond-like nano-composite layer is applied to the siloxane layer by a chemical vapor deposition process.
8. The coating of claim 7 , wherein the chemical vapor deposition process is selected from ion beam plasma enhanced chemical vapor deposition and plasma enhanced chemical vapor deposition.
9. The coating of claim 1 , wherein the substrate is a lens.
10. The coating of claim 1 , wherein the substrate is a plastic.
11. The coating of claim 10 , wherein the substrate is selected from the group consisting of poly(methyl methacrylate), polycarbonate, and co-extrusions of poly(methyl methacrylate) and polycarbonate.
12. The coating of claim 1 , wherein the substrate is flexible.
13. The coating of claim 1 , wherein the siloxane layer comprises an interpenetrating network of a siloxane and an acrylic.
14. The coating of claim 1 , wherein the siloxane layer comprises from 25 wt.% to 50 wt.% siloxane.
15. The coating of claim 1 , wherein the another siloxane layer comprises an interpenetrating network of a siloxane and an acrylic.
16. The coating of claim 1 , wherein the another siloxane layer comprises from 10 wt.% to 25 wt.% siloxane.
17. The coating of claim 1 , wherein the siloxane layer has a hardness from 20 Vickers to 200 Vickers.
18. The coating of claim 1 , wherein the another siloxane layer has a hardness from 100 Vickers to 250 Vickers.
19. The coating of claim 1 , wherein the siloxane layer has a thickness from 20 microns to 50 microns.
20. The coating of claim 1 , wherein the another siloxane layer has a thickness from 5 microns to 25 microns.