| 摘要 |
<p>It comprises a plurality of superimposed layers of polymerisation resins, with at least one of the layers being the covering layer and another of the layers being the base layer, characterised in that the polymerisation resin of the various layers is a polymer, a copolymer or a terpolymer of polyolefin, the cover layer or layers comprising between 1% and 40% of vinyl acetate, with densities between 0.9 and 1.5 g/cm<3> and hardnesses of Shore A 30 to 90 DEG , while the foamed base layer has between 18% and 70% vinyl acetate, with densities ranging between 0.1 and 0.6 g/cm<3> and hardnesses between Shore A 7 and 70 DEG .</p> |
