Film mirror having ultraviolet ray reflection film
Disclosed is a film mirror used for reflection of sunlight, which includes, in the following order from the side where sunlight is entered, an ultraviolet ray reflection film which reflects ultraviolet ray and transmits visible and infrared light, a plastic film layer, a metal reflection-layer which reflects visible and infrared light, and a protective layer.
1. A film mirror used for reflection of sunlight comprising, in the following order from the side where sunlight is entered, an ultraviolet ray reflection film which reflects ultraviolet ray and transmits visible and infrared light, a plastic film layer, a metal reflection-layer which reflects visible and infrared light, and a protective layer, and
the film mirror has a barrier layer between the ultraviolet ray reflection film and the plastic film layer, whose barrier layer exhibits oxygen transmittance of 0.01 ml/m 2 /day/MPa or less, and moisture vapor transmittance of 0.001 g/m 2 /day or less.
2. The film mirror of claim 1 , wherein the thickness T of the plastic film layer is 10 μm≦T≦300 μm.
3. The film mirror of claim 1 , wherein the ultraviolet ray reflection film is constituted of dielectric multi-layers.
4. The film mirror of claim 3 , wherein the dielectric multi-layers has a constitution that the dielectric multi-layers are laminated alternatively, in 4 layers or more and 6 layers or less, with a dielectric layer exhibiting a high refractive index and a dielectric layer exhibiting a low refractive index.
5. The film mirror of claim 1 , wherein the ratio of the total thickness of the ultraviolet ray reflection film and the barrier layer with respect to the thickness of the plastic film layer is 0.1 to 1.0%.
6. The film mirror of claim 1 , wherein, between the ultraviolet ray reflection film which is constituted of dielectric multi-layers which are laminated alternatively, in 4 layers or more and 6 layers or less, with a dielectric layer exhibiting a high refractive index and a dielectric layer exhibiting a low refractive index, and the plastic layer, the film mirror has a barrier layer exhibiting oxygen transmittance of 0.01 ml/m 2 /day/MPa or less and moisture vapor transmittance of 0.001 g/m 2 /day or less, and, in addition, the barrier layer doubles as the dielectric layer exhibiting a low refractive index of the ultraviolet ray reflection film.
7. The film mirror of claim 1 , wherein, between the ultraviolet ray reflection film and the plastic layer, the film mirror has a barrier layer exhibiting oxygen transmittance of 0.01 ml/m 2 /day/MPa or less, and moisture vapor transmittance of 0.001 g/m 2 /day or less, and the ultraviolet ray reflection film and/or the barrier layer are formed via an atmospheric pressure plasma polymerization method.
8. The film mirror of claim 1 , wherein, between the ultraviolet ray reflection film and the plastic layer, the film mirror has a barrier layer exhibiting oxygen transmittance of 0.01 ml/m 2 /day/MPa or less and moisture vapor transmittance of 0.001 g/m 2 /day or less, and the total τ of an internal stress of the ultraviolet ray reflection film and the barrier layer is 0.1 MPa≦τ≦3 MPa.
9. The film mirror of claim 1 , wherein the metal reflection-layer is constituted of silver.
10. The film mirror of claim 1 , wherein the film mirror is used outdoors.
11. The film mirror of claim 1 , wherein an average reflectance for electromagnetic wave of 320 to 400 nm of the ultraviolet ray reflection film of 75% or more.
12. The film mirror of claim 1 , wherein the ultraviolet ray reflection film comprises alternating layers of more than two kinds of dielectric substance differing in refractive index.
13. The film mirror of claim 12 , wherein the ultraviolet ray reflection film comprises a high refractive index dielectric layer exhibiting a high refractive index of 2.0 to 2.6 and a low refractive index refractive index dielectric layer exhibiting a low refractive index of 1.8 or less.
14. The film mirror of claim 13 , wherein the high refractive index dielectric layer comprises ZrO 2 or TiO 2 .
15. The film mirror of claim 13 , wherein the low refractive index refractive index dielectric layer comprises SiO 2 or Al 2 O 3 .
16. The film mirror of claim 1 , wherein the plastic film layer is composed of a polyester, polyethylene naphthalate, polycarbonate, polyolefin, cellulose derivative, vinyl type, polyimides, polyamide, polyethersulfone, polysulfone type, polyarylate type or fluorine type resin.
17. The film mirror of claim 16 , wherein the plastic film layer is composed of a polyethylene terephthalate or cycloolefin polymer.