Patent ID: 8034439

Claim:
A plastic substrate having a multi-layer structure, comprising: plastic films attached to each other, and a first buffering layer of an organic-inorganic hybrid, a layer of gas barrier, and a second buffering layer of an organic-inorganic hybrid which are stacked on both sides of the plastic films in an orderly manner, each layer forming a symmetrical arrangement centering around the plastic films, wherein each of the first organic-inorganic hybrid buffer layer and the second organic-inorganic hybrid buffer layer is prepared from partial hydrolysis of a buffer composition comprising 20-99.99 wt % of at least one organic silane selected from the group consisting of the compounds represented by Chemical Formula 1 below and 0.01-80 wt % of at least one metal alkoxide selected from the group consisting of the compounds represented by Chemical Formula 2: (R 1 ) m —Si—X (4-m) (1) where X, which may be identical or different, is hydrogen, halogen, C 1-12 alkoxy, acyloxy, alkycarbonyl, alkoxycarbonyl, or —N(R 2 ) 2 (where R 2 is H or C 1-12 alkyl); R 1 , which may be identical or different, is C 1-12 alkyl, alkenyl, alkynyl, aryl, arylalkyl, alkylarl, arylalkenyl, alkenylaryl, arylalkynyl, alkynylaryl, halogen, substituted amino, amide, aldehyde, keto, alkylcarbonyl, carboxy, mercapto, cyano, hydroxy, C 1-12 alkoxy, C 1-12 alkoxycarbonyl, sulfonate, phosphate, acryloxy, methacryloxy, epoxy, or vinyl; oxygen or —NR 2 (where R 2 is H or C 1-12 alkyl) may be inserted between R 1 and Si to give —(R 1 ) m —O—Si—X (4-m) or (R 1 ) m —NR 2 —Si—X (4-m) ; and m is an integer of 1-3; and M-(R 3 ) z (2) where M is a metal selected from the group consisting of aluminum, zirconium, and titanium; R 3 , which may be identical or different, is halogen, C 1-12 alkyl, alkoxy, acyloxy, or hydroxy; and Z is an integer of 3 or 4.