Hot-melt adhesive as intermediate layer of a laminate structure

Claim 1

In a laminate structure comprising (1) at least one layer of an ethylene-vinyl alcohol copolymer, (2) at least one layer of a moisture-resistant resin composed of a polyolefin, a polyester or a polycarbonate, and (3) an adhesive layer interposed between the layer (1) and the layer (2), the improvement which comprises using as said adhesive layer a hot-melt composition comprising (A)(i) an acid-modified olefin resin formed by graft modification of a trunk polymer comprising at least one olefin resin selected from the group consisting of low density polyethylene, medium density polyethylene, high density polyethylene, isotactic polypropylene, a propylene-ethylene copolymer, a propylene-butene-1 copolymer, a propylene-ethylene-butene-1 copolymer, an ethylene-vinyl acetate copolymer and an ion-crosslinked olefin copolymer, with an ethylenically unsaturated carboxylic acid or its anhydride or (ii) a resin mixture of said acid-modified olefin resin with an olefin resin selected from group providing said trunk polymer for said acid-modified olefin resin and (B) an oxirane ring-containing compound selected from the group consisting of epoxidized glycerides, epoxidized fatty acid esters and epoxy hexahydrophthalic acid esters, said composition including said acid- or acid anhydride-modified olefin resin in an amount sufficient to provide a carbonyl group concentration of 1 to 600 millimoles per 100 g of the composition and an oxirane oxygen concentration of 0.01 to 50 millimoles per 100 g of the composition.