RIGID AND SEMI-RIGID thermoplastic structures with multiple coextruded polymeric LAYERS INCLUDING AN INTERNAL LOW OFF VINYLIDENE CHLORIDE COPOLYMER AND IMPLEMENTING THESE STRUCTURES FOR THE MANUFACTURE OF PACKING MATERIALS.

摘要

The thermoplastic structures incorporate an inner vinylidene chloride copolymer layer, each face of which is bonded to a vinyl chloride polymer (2) layer through the intermediacy of a separate intermediary vinyl chloride polymer (1) layer whose gel temperatrue and dynamic viscosity are lower than those of the adjacent vinyl chloride polymer (2). The thermoplastic structures with multiple coextruded polymeric layers may be in the form of sheets, plaques, tubes or rigid or semirigid hollow bodies, which can be employed in the field of packaging.