Antifouling coating for eyeglass lenses with a higher coefficient of friction than uncoated lenses
The optical article includes an optical substrate comprising a concave surface with a radius of curvature of equal to or greater than 350 mm on one side and a convex surface with a radius of curvature of equal to or greater than 120 mm on the other side, a first antifouling layer directly or through at least one additional layer on the concave surface, and a second antifouling layer directly or through at least one additional layer on the convex surface, and satisfies the conditions below: 0.01≦μL1≦0.12 0.1≦μL2 μL1<μL2 wherein μL1 denotes a coefficient of static friction of a surface of the first antifouling layer, and μL2 denotes a coefficient of static friction of a surface of the second antifouling layer.
1. An optical article, which comprises:
an optical substrate comprising a concave surface with a radius of curvature of equal to or greater than 350 mm on one side and a convex surface with a radius of curvature of equal to or greater than 120 mm on the other side;
a first antifouling layer directly or through at least one additional layer on the concave surface; and
a second antifouling layer directly or through at least one additional layer on the convex surface;
and satisfies the conditions below:
0.01≦μL1≦0.12
0.1≦μL2
μL1<μL2
wherein μL1 denotes a coefficient of static friction of a surface of the first antifouling layer, and μL2 denotes a coefficient of static friction of a surface of the second antifouling layer.
2. An optical article, which comprises:
an optical substrate comprising a concave surface on one side and a convex surface on the other side;
a first antifouling layer directly or through at least one additional layer on the concave surface; and
a second antifouling layer directly or through at least one additional layer on the convex surface;
and satisfies the conditions below:
0.01≦μG1≦0.1
0.1≦μG2
μG1<μG2
wherein μG1 denotes a coefficient of static friction of a surface of the first antifouling layer when formed directly or through at least one additional layer on a flat glass substrate, and μG2 denotes a coefficient of static friction of a surface of the second antifouling layer when formed directly or through at least one additional layer on a flat glass substrate.
3. The optical article according to claim 1 , which is an eyeglass lens.
4. The optical article according to claim 3 , wherein the first antifouling layer is an outermost layer on an eyeball side of the eyeglass lens.
5. The optical article according to claim 1 , wherein each of the first antifouling layer and the second antifouling layer is an outermost layer of the optical article.
6. The optical article according to claim 1 , wherein the first antifouling layer and the second antifouling layer comprises an antifouling agent in the form of an organic compound.
7. The optical article according to claim 6 , wherein the organic compound is a fluorine-containing organic compound.
8. The optical article according to claim 2 , which is an eyeglass lens.
9. The optical article according to claim 8 , wherein the first antifouling layer is an outermost layer of the eyeglass lens.
10. The optical article according to claim 2 , wherein each of the first antifouling layer and the second antifouling layer is an outermost layer of the optical article.
11. The optical article according to claim 2 , wherein the first antifouling layer and the second antifouling layer comprises an antifouling agent in the form of an organic compound.
12. The optical article according to claim 11 , wherein the organic compound is a fluorine-containing organic compound.