| 摘要 |
<p>PURPOSE: To obtain multilayer films adapted to high-gloss laminates by laminating an outer layer comprising polypropylene and a polymeric anti-blocking additive and a particular heat-activatable, heat-laminatable layer on a base layer comprising polypropylene with no anti-blocking additive. CONSTITUTION: A heat-laminatable, at least monoaxially stretched multilayer film comprises a base layer I comprising polypropylene, an outer layer II comprising polypropylene and containing at least one anti-blocking additive, and at least one heat-activatable, heat-laminatable layer III containing copolymerized ethylene units. The heat-laminatable layer III contains at least one copolymer selected from the group of an ethylene/vinyl acetate copolymer, ethylene/ethyl acrylate copolymer and ethylene/acrylic acid copolymer, and the layer I is free from anti-blocking additives. The multilayer film accommodates the anti- blocking additives in only the outer layer II and keep the base layer I free from the anti-blocking additives so that this provides the film with transparency, and there is the boundary layer between the polymers of the base layer I and the heat-laminatable layer III so that the optical properties are improved.</p> |
