STYVA OCH HALVSTYVA TERMOPLASTISKA STRUKTURER BESTAOENDE AV FLERA SAMTIDIGT STRAENGSPRUTADE POLYMERSKIKT, AV VILKA KOPOLYMERER I DET INRE SKIKTET OMFATTAR VINYLIDENKLORID, OCH ANVAENDNING AV DESSA STRUKTURER FOER FRAMSTAELLNING AV FOERPACKNINGAR.

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.