In accordance with an example embodiment of the present disclosure, the epoxy siloxane resin may include an antioxidant in order to prevent oxidation reaction of the polymeric species, but may not be limited thereto. The antioxidant may be a mixture of one or more selected from the group consisting of phenolic antioxidants, phosphite antioxidants, aminic antioxidants, thioester antioxidants or the like, but may not be limited thereto. For example, the phenolic antioxidant may include selected from the group consisting of tetrakis[methylene-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]methane, 1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine, thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], octadecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, isotridecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, N,N′-hexamethylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide), benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2,2′-ethylidene bis(4,6-di-tert-butylphenol), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 4,6-bis(octylthiomethyl)-o-cresol, 1,3,5-tris(2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl)isocyanurate, 2,2′-methylene bis(4-methyl-6-tert-butylphenol), triethylene glycol-bis-3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate, 2,5-di-tert-amyl-hydroquinone, hexa methylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris-(3,5-di-tert-butylhydroxybenzyl) isocyanurate, 4,4′-thiobis(6-tert-butyl-m-cresol), 4,4′-butylidene bis (6-tert-butyl-3-methylphenol) and combinations thereof. The phosphite antioxidant may include selected from the group consisting of tris(2,4-di-tert-butylphenyl)phosphite, distearyl pentaerythritol diphosphite, bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite, triphenyl phosphite, triisodecyl phosphite, diphenylisodecyl phosphite, 2-ethylhexyl diphenyl phosphite, poly(dipropylene glycol)phenyl phosphite, tris(nonylphenyl)phosphite and combinations thereof, the aminic antioxidant may include 2,2,4-trimethyl-l,2-dihyd-roquinoline oligomer, the thioester antioxidant may include selected from the group consisting of pentaerythritol tetrakis(3-laurylthiopropionate), distearyl thiodipropionate, dilauryl thiodipropionate, ditridecyl thiodipropionate and combinations thereof, but may not be limited thereto. Although the addition amount of the antioxidant may not be particularly limited, it may be to add it in an amount of from about 0.1 to about 10 parts by weight with respect to the epoxy siloxane resin of about 100 parts by weight.