Patent ID: 7857931
Filing Date: 2010-12-28
Classification: B32B,G02F,H01L,Y02E,Y02P,Y10T

Abstract:
1. A method for preparing a plastic substrate having a multi-layer structure comprising the steps of: a) forming a first organic-inorganic hybrid buffer layer on one side of a plastic film by coating a buffer composition in a sol state thereon and curing the buffer composition, wherein the plastic film having a thickness of 10 to 1,000 microns (μm) is made of at least one selected from the group consisting of a homopolymer, at least one polymer blend, and a polymer composite material including organic or inorganic additives; b) forming a gas barrier layer on the first organic-inorganic hybrid layer by coating an inorganic material thereon, wherein the gas barrier layer having a thickness of 5˜1000 nm is made of at least one inorganic material selected from the group consisting of SiO c) forming a second organic-inorganic hybrid buffer layer on the gas barrier layer by coating the buffer composition of the step a) and curing the buffer composition to prepare a multi-layer film; d) preparing another multi-layer film having the same structure as that obtained in the step c); and e) attaching the plastic film of the step c) and the step d), so that sides with no multi-layer film contact each other, and then each layer forms 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 having a thickness of 0.5˜20 micron(μm) 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: where X, which may be identical or different, is hydrogen, halogen, C R oxygen or —NR m is an integer of 1-3; and where M is a metal selected from the group consisting of aluminum, zirconium, and titanium: R Z is an integer of 3 or 4.