MULTILAYER STRUCTURE, METHOD FOR PRODUCING SAME, SHEET FOR PREVENTING DIFFUSION OF HAZARDOUS SUBSTANCE, LANDFILL GEOMEMBRANE AND MULTILAYER PIPE

摘要

The present invention provides: a multilayer structure which exhibits high initial interlayer adhesion and is suppressed in decrease of the interlayer adhesion even in cases where the multilayer structure is used for a long period of time in a harsh environment where the multilayer structure is exposed to hot water, an acid or an alkali, and the like; a method for producing this multilayer structure; and a sheet for preventing diffusion of a hazardous substance, a landfill geomembrane and a multilayer pipe, each of said sheet, landfill geomembrane and multilayer pipe being provided with this multilayer structure. A multilayer structure which is provided with: one or more layers (A), each of which is formed of a resin composition (A) that is mainly composed of an ethylene-vinyl alcohol copolymer (a); and one or more layers (B), each of which is formed of a resin composition (B) that contains a modified polyolefin (b) having a basic nitrogen-containing group. With respect to this multilayer structure, the ethylene-vinyl alcohol copolymer (a) has at least one of a carboxy group and a lactone ring; and the total amount of the carboxy group and the lactone ring is from 0.08% by mole to 0.4% by mole relative to the total amount of ethylene units, vinyl alcohol units and vinyl ester units in the ethylene-vinyl alcohol copolymer (a).