Method for manufacturing anti-reflective coating film

1. A method for manufacturing an anti-reflective coating film, comprising the steps of:

providing an anti-reflective coating composition comprising a binder composition comprising a first (meth)acrylate-based compound and a second (meth)acrylate-based compound having a higher molecular weight than the first (meth)acrylate-based compound, inorganic nanoparticles, hollow particles, an initiator, and a solvent;

applying the coating composition onto at least one surface of a substrate;

drying the coating composition applied to allow at least a part of the first (meth)acrylate-based compound and inorganic nanoparticles to infiltrate into the substrate; and

curing the composition to form a first layer that corresponds to the infiltrated region of the substrate, and a second layer comprising hollow particles, which covers the first layer,

wherein a percentage of the cross-sectional area of the hollow particles to any cross-sectional area of the second layer is 70 to 95%,

wherein the inorganic nanoparticles have a number average diameter of 5 to 50 nm,

wherein the hollow particles have a number average diameter of 5 to 80 nm,

wherein the refractive index of the second layer is 1.45 or less.

2. The method according to claim 1 , wherein the anti-reflective coating composition comprises 5 to 30 parts by weight of the inorganic nanoparticles, 1 to 30 parts by weight of the hollow particles, 5 to 25 parts by weight of the initiator, and 100 to 500 parts by weight of the solvent, based on 100 parts by weight of the binder composition.

3. The method according to claim 1 , wherein the first (meth)acrylate-based compound has a molecular weight of less than 600.

4. The method according to claim 1 , wherein the second (meth)acrylate-based compound has a molecular weight of 600 to 100,000.

5. The method according to claim 1 , wherein the binder composition comprises 5 to 30 parts by weight of the second (meth)acrylate-based compound, based on 100 parts by weight of the first (meth)acrylate-based compound.

6. The method according to claim 1 , wherein the first (meth)acrylate-based compound is one or more compounds selected from the group consisting of pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylenepropane tri(meth)acrylate, ethylene glycol di(meth)acrylate, 9,9-bis[4-(2-acryloxyethoxy)phenyl]fluorene, bis(4-methacryloxythiophenyl)sulfide, and bis(4-vinylthiophenyl)sulfide.

7. The method according to claim 1 , wherein the second (meth)acrylate-based compound comprises a compound having two or more molecules of the first (meth)acrylate-based compound linked via a linker.

8. The method according to claim 7 , wherein the second (meth)acrylate-based compound comprises a compound having one or more substituents selected from the group consisting of an epoxy group, a hydroxyl group, a carboxyl group, a thiol group, an aromatic or aliphatic hydrocarbon group having 6 carbon atoms or more, and an isocyanate group.

9. The method according to claim 7 , wherein the linker comprises a urethane bond, a thioether bond, an ether bond or an ester bond.

10. The method according to claim 1 , wherein the binder composition further comprises a fluorine-based (meth)acrylate compound substituted with one or more fluorine atoms.

11. The method according to claim 10 , wherein the fluorine-based (meth)acrylate compound comprises one or more compounds selected from the group consisting of the compounds of the following Chemical Formulae 1 to 5:

wherein R 1 is a hydrogen group or an alkyl group having 1 to 6 carbon atoms, a is an integer of 0 to 7, and b is an integer of 1 to 3;

wherein c is an integer of 1 to 10;

wherein d is an integer of 1 to 11;

wherein e is an integer of 1 to 5;

wherein f is an integer of 4 to 10.

12. The method according to claim 1 , wherein the inorganic nanoparticles are silica nanoparticles.

13. The method according to claim 1 , wherein the hollow particles are hollow silica particles.

14. The method according to claim 1 , wherein the solvent has a dielectric constant (25° C.) of 20˜30, and a dipole moment of 1.7˜2.8.

15. The method according to claim 1 , wherein the drying step is performed at a temperature of 5 to 150° C. for 0.1 to 60 minutes.

16. The method according to claim 1 , wherein the curing step is performed at UV radiation of 0.1 to 2 J/cm 2 for 1 to 600 seconds.