Layered body for optical member and image display device
The present invention provides a layered body for organic electroluminescence which is excellent in the hardness, the transparency and the folding-durable performance. The present invention is a layered body for organic electroluminescence in which an optical layered body is laminated on one surface of an organic electroluminescence layer and which is not cracked or fractured when a test in which the entire area of the layered body for organic electroluminescence is folded 180 degrees at 20 mm intervals is repeated 100,000 times.
1. A layered body for an optical member,
the layered body being used as a surface material of an optical member,
the layered body comprising:
a substrate film; and
at least one cured resin layer,
the layered body being not cracked or fractured when a test in which the entire area of said layered body for an optical member is folded 180 degrees at 20 mm intervals is repeated 100,000 times, wherein
when spectral reflectivities of the layered body for an optical member in a wavelength region of 400 nm to 700 nm are determined, a standard deviation of the spectral reflectivity in an arbitrary range of 50 nm is less than 0.045.
2. The layered body for an optical member according to claim 1 , wherein the layered body for an optical member is not cracked or fractured when a test in which the entire area of the layered body for an optical member is folded 180 degrees at 3 mm intervals is repeated 100,000 times.
3. The layered body for an optical member according to claim 1 , wherein a hardness of a pencil hardness test (load of 1 kg) of the cured resin layer, specified in JIS K5600-5-4 (1999), is 4H or higher.
4. The layered body for an optical member according to claim 1 , wherein the layered body for an optical member is not scuffed in a steel wool resistance test in which a surface of the cured resin layer is scrubbed to and fro 3500 times with #0000 steel wool under a load of 1 kg/cm 2 .
5. The layered body for an optical member according to claim 1 , wherein the substrate film is a polyethylene terephthalate film, a polyimide film, a triacetyl cellulose film, a polyethylene naphthalate film, a polyamide-imide film, a polyetherimide film, a polyetherketone film, a polyamide film, or an aramid film.
6. The layered body for an optical member according to claim 1 , wherein a thickness of the substrate film is 10 to 100 μm.
7. The layered body for an optical member according to claim 1 , further comprising a cured layer of a monofunctional monomer.
8. The layered body for an optical member according to claim 7 , comprising the cured layer of a monofunctional monomer on a side of the cured resin layer of the substrate film.
9. The layered body for an optical member according to claim 1 , wherein the cured resin layer has a first hard coat layer disposed on a surface of the substrate film opposite to the optical member, and a second hard coat layer disposed on a surface of said first hard coat layer opposite to said substrate film.
10. The layered body for an optical member according to claim 9 , wherein
the second hard coat layer contains a cured product of a polyfunctional (meth)acrylate monomer as a resin component, and
the first hard coat layer contains a cured product of a polyfunctional (meth)acrylate as a resin component and silica fine particles dispersed in said resin component.
11. The layered body for an optical member according to claim 10 , wherein the silica fine particles are reactive silica fine particles.
12. The layered body for an optical member according to claim 1 , wherein the cured resin layer has a projection and depression shape on a surface opposite to the substrate film.
13. A foldable image display device formed by using the layered body for an optical member according to claim 1 .