Anti-reflective coating composition and coating film with excellent stain resistance
The present invention relates to a coating composition for forming an anti-reflective coating layer for a display device, comprising a fluorinated silane with low surface tension, a conductive polymer with antistatic properties, water, and a solvent. Thus, the coating film of the present invention prepared by coating the composition has high anti-reflection, excellent stain resistance to liquid-phase stains such as fingerprints and the solid-phase stains such as dust by controlling the refractive index, surface energy, and conductivity, and thus can be usefully applied to the outermost side of a display device, regardless of the type of substrates such as a Braun tube or a flat display film and the presence of other coating layers such as a hard coating layer and an anti-glare coating layer.
1. A coating composition for forming an anti-reflective coating layer in a display device, comprising:
(a) a sol-gel reaction product prepared by reacting (i) an alkoxy silane at 0.3 to 15 parts by weight, (ii) a fluorinated silane at 0.1 to 10 parts by weight, (iii) a catalyst at 0.001 to 0.5 parts by weight, (iv) water at 0.01 to 10 parts by weight, and (v) an organic solvent at 20 to 99.5 parts by weight; and
(b) a conductive polymer at 0.02 to 50 parts by weight.
2. The coating composition according to claim 1 , wherein the organic solvent is a mixture comprising at least two solvents selected from the group consisting of alcohols, cellosolves, and ketones.
3. The coating composition according to claim 2 , wherein the mixture comprises alcohols, and further comprises at least one selected from the group consisting of ketones and cellosolves.
4. The coating composition according to claim 1 , wherein the fluorinated silane is at least one selected from the group consisting of tridecafluorooctyltriethoxysilane, heptadecafluorodecyltrimethoxylsilane, heptadecylfluorodecyltrimethoxysilane, and a mixture thereof.
5. The coating composition according to claim 1 , wherein the conductive polymer is a polythiophene.
6. The coating composition according to claim 1 , wherein the conductive polymer is a polythiophene doped with at least one selected from the group consisting of glutamic acid, alkylsufonic acid, anions of polystyrene sulfonic acid, a copolymer of styrene sulfonic acid and its anions, and a mixture thereof.
7. The coating composition according to claim 1 , wherein the catalyst is at least one selected from the group consisting of acids, metal salts, and a mixture thereof.
8. An anti-reflective coating film for a display device prepared with the anti-reflective coating composition according to claim 1 .