TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: The inorganic barrier layer is an inorganic oxide membrane formed by chemical vaporization deposition method. The moisture-content trap layer and inorganic barrier layer are joined. The crosslinked structure is formed by reaction of cationic group and epoxy group, in which the cationic group has starting point. The siloxane structure is introduced by the reaction of silane compound which has epoxy group or the alicyclic structure derived from the compound which has epoxy group. The crosslinked structure containing siloxane structure or alicyclic structure is introduced into the matrix. When the crosslinked structure has alicyclic structure, then siloxane structure is further introduced into the matrix. The crosslinked structure is introduced by crosslinking reaction between the epoxy group and the anionic group (a2) having the anionic polymer, in which siloxane structure is introduced by reacting silane compound and anionic polymer (a2). The adhesion agent having functional groups reactive towards the surface of the inorganic barrier layer and the matrix in which the crosslinked structure has been introduced (c) is blended with moisture-content trap layer, in which the siloxane structure is introduced by reaction with adherence agent and matrix.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The adherence agent (c) is a compound which has an alicyclic epoxy group and an alkoxy silyl group. The hydroscopic agent is a crosslinked material of monovalent metal salt of poly(meth)acrylic acid. The crosslinking agent and adherence agent are silane compound of formula: X-SiR1n(OR2)3-n or glycidyl compound of formula: G-O(C=O)-A-(C=O)O-G.X=organic group having epoxy at terminal;R1,R2=methyl, ethyl or isopropyl;n=0, 1 or 2;G=glycidyl;andA=diglycidyl ester.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The ionic polymer (a) is a cationic polymer (a1), anionic polymer (a2) and optionally contains adherence agent (c). The coating composition comprises 100 pts. wt. cationic polymer (a1), 50-1000 pts. wt. hydroscopic agent and 5-60 pts. wt. crosslinking agent or 100 pts. wt. anionic polymer (a2), 50-1300 pts. wt. hydroscopic agent 1-50 pts. wt. crosslinking agent and 0.1-10 pts. wt. adherence agent. Preferred Process: Alternatively, the crosslinked structure introduced into the matrix is formed from the anionic polymer (a2).