Anti-glare film and process for producing the same
An anti-glare film comprises an anti-glare layer having a ridge on a surface thereof. The ridge is formed by phase separation of a plurality of resin components, and the ridge has a branched structure and a total length of not less than 100 μm, and one or more of the ridges per square millimeter exist on the surface of the anti-glare layer.
1. An anti-glare film comprising an anti-glare layer having a ridge on a surface thereof, the ridge being formed by phase separation of a plurality of resin components,
wherein an area of the ridge is 80 to 99% of the whole surface of the anti-glare layer,
the ridge forms a bicontinuous phase structure,
the anti-glare film has a transmitted image clarity of 70 to 100% measured with an image clarity measuring apparatus provided with an optical slit of 0.5 mm width.
2. An anti-glare film according to claim 1 , wherein the bicontinuous phase structure has a net-like pattern with an average diameter of a major axis and a minor axis of each net-like pattern of 1 to 70 μm.
3. An anti-glare film according to claim 1 , which has a haze of 10 to 40%, and a total light transmittance of 70 to 100%.
4. An anti-glare film according to claim 1 , wherein the plurality of resin components contain:
a plurality of polymers selected from the group consisting of a styrenic resin, a (meth)acrylic resin, an alicyclic olefinic resin, a polyester-series resin, an aliphatic organic acid cellulose ester, and an aromatic organic acid cellulose ester, and
a cured product of at least one curable resin-precursor selected from the group consisting of an epoxy (meth)acrylate, a urethane (meth)acrylate, a polyester (meth)acrylate, a silicone (meth)acrylate, and a polyfunctional monomer having at least two polymerizable unsaturated bonds,
wherein at least two components among the polymers are phase-separated by spinodal decomposition from a liquid phase.
5. An anti-glare film according to claim 4 , wherein the curable resin-precursor contains a low-viscous curable resin-precursor having a viscosity at 25° C. of not higher than 3000 mPa·s.
6. An anti-glare film according to claim 1 , which further comprises a transparent film, a first side of the transparent film having the anti-glare layer.
7. An anti-glare film according to claim 6 , wherein at least portion of a second side of the transparent film has an adhesive layer.
8. An anti-glare film according to claim 1 , which is a protective film to be disposed on an outermost surface of a display.
9. An anti-glare film according to claim 8 , wherein the display is an organic EL display.
10. A process for producing an anti-glare film recited in claim 1 , which comprises the steps of:
applying a liquid composition containing a plurality of resin components and a solvent on a support, and
drying the applied liquid composition to form a phase-separation structure by spinodal decomposition with evaporation of the solvent.
11. A process according to claim 10 , wherein the drying step is carried out at a temperature higher than 80° C.