| 摘要 |
PURPOSE:To enhance oil permeation-preventive properties of the above material and detect non-failure of an adhesive layer by a method wherein the adhesive layer having a primary material layer and a specific resin layer laminated on the outer and the inner sides of the adhesive layer, respectively, is formed of a specific modified high- density polyethylene resin or the like and a specific linear ultralow-density polyethylene resin. CONSTITUTION:A multi-layer laminated structural material has a primary material layer mainly composed of a polyethylene resin on the outer side of said structural material and an ethylene-vinyle acetate saponified substance-type resin layer, or a nitrile-type resin layer, on the inner side of said structural material, and both the layers are laminated together via an adhesive layer. In this case, the adhesive layer is formed of a specific resin composition which is composed of resin containing a specific modified high-density polyethylene resin, or a linear low-density polyethylene resin, and a specific linear ultralow-density polyethylene resin. Further, the density of said resin composition is set to 0.925g/cm<3> or more, the content of a grafted unsaturated carboxylic acid or the like is set to 0.001 to 5.0wt.%, and acoustic impedance by an ultrasonic wave of 20 to 25MHz is set to be small not less than 8.5X10<-3>g/ cm<2>.musec with respect to the primary material, respectively. |
