Patent ID: 8748003

Claim:
A gas barrier laminate comprising a substrate having thereon at least a gas barrier layer and a polymer layer, the laminate being an organic EL element base plate, wherein at leas t one polymer layer is provided on the substrate and at least one gas barrier layer is provided on the polymer layer, wherein an average carbon content of the polymer layer at a contact interface between the substrate and the polymer layer is higher than an average carbon content in the polymer layer other than the contact interface between the substrate and the polymer layer; an average carbon content of the polymer layer at a contact interface between the polymer layer and the gas barrier layer is lower than an average carbon content in the polymer layer, wherein the average carbon content is an average atomic concentration in percent of carbon atoms defined by the following equation: atomic concentration=Number of carbon atoms/Number of whole atoms×100; the contact interface between the polymer layer and the substrate or the contact interface between polymer layer and gas barrier layer is 10% of a thickness of the polymer layer from the contact interface when the thickness of the polymer layer is set at 100%; and a difference between an average atomic concentration of carbon atoms of the polymer layer and an average atomic concentration of carbon atoms at the contact interface between the polymer layer and the substrate or the contact interface between the polymer layer and the gas barrier layer is not less than 2%; the gas barrier layer comprises a metal; and the polymer layer comprises a metal.